HomeMy WebLinkAboutApplication.pdfc::E> Garfield County Community Development Department 108 8th Street, Suite 401 Glenwood Springs, CO 81601 (970) 945-8212 www_garfield-county_com I TYPE OF GRADING I!l MAJOR INVOLVED
PARTIES Property Owner: J&S Nieslanik, LLLP 10 MINOR Phone: L_:~_J 945-5130 Mailing Address: 3118 South Grand Avenue Glenwood Springs, CO 81601 Contractor: To Be Determined Phone: (
_ ) Mailing Address: Architect: Redi Engineering Services, LLC. Phone: L_~~_.J 459-7302 Mailing Address: 225 Union Blvd. Ste. 500 Lakewood, CO 80228 Engineer: Redi Engineering Services,
LLC. Phone: (~)459-7302 Mailing Address: 225 Union Blvd. Ste. 500 Lakewood, CO 80228 PROJECT NAME AND LOCATION Project Name: Spring Valley Compressor Station Describe Work: To build
a compressor station adjacent to the existing pipeline to better distribute natural gas in the area. Job Address: NW 1/4 NE 1/4 Section 3, T7S, R88W, 6th PM Assessor's Parcel Number:
2393-032-00-032 Sub. Lot Block Earthwork (square feet): 8,597 Earthwork (Cubic Yards): 29,523 ALL UTILITIES MUST BE LOCATED PRIOR TO ANY GRADING
NOTICE Authority. This application for a Building Permit must be signed by the Owner of the property, described above, or an authorized agent. If the signature below is not that of the
Owner, a separate letter of authority, signed by the Owner, must be provided with this Application. legal Access. A Building Permit cannot be issued without proof of legal and adequate
access to the property for purposes of inspections by the Building Division. Other Permits. Multiple separate permits may be required : (1) State Electrical Permit, (2) County ISDS Permit,
(3) another permit required for use on the property identified above, e.g. State or County Highway/Road Access or a State Wastewater Di scharge Permit. Void Permit. A Building Permit
becomes null and void if the work authorized is not commenced within 180 days of the date of issuance and if work is suspended or abandoned for a period of 180 days after commencement.
CERTIFICATION I hereby certify that I have read this Application and that the information contained above is true and correct. I understand that the Building Division accepts the Application,
along with the plans and specifications and other data submitted by me or on my behalf (submittals), based upon my certification as to accuracy. Assuming completeness of the submittals
and approval of this Application, a Building Permit will be issued granting permission to me, as Owner, to construct the structure(s) and facilities detailed on the submittals reviewed
by the Building Division. In consideration of the issuance of the Building Permit, I agree that I and my agents will comply with provisions of any federal, state or loca l law regulating
the work and the Garfield County Building Code, ISDS regulations and applicable land use regulations (County Regulation(s)). I acknowledge that the Building Permit may be suspended or
revoked, upon notice from the County, if the location, construction or use of the structure(sl and facility(ies), described above, are not in compliance with County Regulation(s) or
any other applicable law. I hereby grant permission to the Building Division to enter the property, described above, to inspect the work. I further acknowledge that the issuance of the
Building Permit does not prevent the Building Official from: (1) requiring the correction of errors in the submittals, if any, discovered after issuance; or (2) stopping construction
or use of the structure(s) or facility(ies) if such is in violation of County Regulation(s) or any other applicable law. Review of this Application, including submittals, and inspections
of the work by the Building Division do not constitute an acceptance of responsibility or liability by the County of errors, omissions or discrepancies. As the Owner, I acknowledge that
responsibility for compliance with federal, state and local laws and County Regulations rest with me and my authorized agents, including without limitation my architect designer, engineer
and/or builder. I hereby acknowledge that I have read and understand the Notice and Certification above as well as have provided the required information which is correct and accurate
to the best of my knowledge. Property Owner Print and Sign Date OFFICIAL USE ONLY Permit Fee: -00 Total Fees: 1$ ~ Fees Paid: $W.ttL Balance due: '$ ~ BUILDING I PLANNING DIVISION :
--':$~E.~=:;;;;:2'::::::J~..,. _______ _ Date
Legend --Loca l Road = County Road • Spring I Seep Water Well Intermittent Stream Scale I : 24 ,000 •••• I Access Road (to be graded) ~ Compressor Site (to be gr~ded) --Perennial Stream
Waterbody o_ ____= ====0.5-____= ===::l1h Miles W+ E s Spring Valley Compressor Station Proposed Locations of Grading sourcJbas Author: mspinelli Date: 9/5/2013 DISCl~ IM [ ~ Tno Ge
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sourcJbas SPRING VALLEY COMPRESSOR STATION STORM WATER MANAGEMENT PLAN PREPARED FOR: ROCKY MOUNTAIN NATURAL GAS LLC 600 12TH STREET, SUITE 300 GOLDEN, CO 80401 PREPARED BY: Grand Junction,
CO 81505 970.243.3271 DATE PREPARED: MARCH 21,2013
sourcJbas Table of Contents 1.0 INTRODUCTION ................................................................................................................................................
I 1.1 STORM WATER RUNOFF PERMIlTING REQUIREMENTS ....................................................... ........... ....................... I 2.0 CONSTRUCTION SITE DESCRIPTION ......................
..................................................................................... 2 2.1 SITE L OCATION ............................................................................................
....................................................... 2 2.2 SITE AREA CHARACTERISTICS ...... ........................................................................................................
................ 2 2.2.1 RlIllo.ffCJwlYlcterislics and Coefficient .... ..... ................................................. .. ... ................. 2 2.2.2 Existing Vegetation......
................ ............... ......................... . ............................................................. 3 2.3 SCHEDULE OF CONSTRUCTION ACTIVITIES ..................................
......................................................................... 3 3.0 POTENTIAL POLLUTION SOURCES ...........................................................................................
................... 4 4.0 DESCRIPTION OF SOIL CONTROL MEASURES ......................................................................................... 5 4.1 STRUCTURAL PRACTICES FOR
EROSION AND SEDIMENT CONTROL ....................................................................... 5 4.1. J Straw Bale and Rock Check Dams....... ....................... .. ....................
5 4.1.2 Straw Wattles/Straw Rolls... ............ ........................... . ..................................... 5 4.1.3 Dil'ersioll HermIC/wl/uel. ............. . ............
....................... ................. .. 5 4. J.4 C/lh'ert IlIletlOllflel Protection .... .......... .................. .. .... 5 4.1.5 Sediment Basins... .......................
.............. .. .......................... 6 4. J.6 AI1110red Rulldo\vlls.... ............................................................................. ............... .. .. 6
4. I. 7 Sill Felice.... ............... ............................. ............... .. ........................... 6 4.1.8 Str(llll Bale Barriers ............................ .................
.............. ... 6 4.1.9 H'ater Bars .... ........... ........... ....... .... .......... ... ....... ............. ... ........ ...... .. ............... .. 6 4.1.10 Trackillg Pads...
........................ ................................ .......................... ........... .. .... 6 4.2 NON-STRUCTURAL PRACTICES FOR EROSION AND SEDIMENT CONTROL ...... .. ........
.............................. ................ 6 4.2. I Vegetalive Buffers ................................ ............................ ................ .. ....... 6 4.2.2 See<iiug
of Disllll'bed Areas.............. ...................... .. ........................................................................ 7 4.2.3 Mulchillg ............................................
. . ................................. . ...... .......... .. 7 4.2.4 Erosioll COlltrol Blankets................... .............. . ........................ 7 4.2.5 SIII.j(lce Roughening..
................... .................... ..................... . ..... .......... ................... 7 5.0 PHASED BMP IMPLEMENTATION ............... .................................................
................................................. 8 5.1 CONSTRUCTION .................. .............. ................................................................................................
..................... 8 5.2 INTERIM RECLAMATION .......... ............................................................... ............... .......... ........ .......................
... .... 8 5.3 FINAL STABILIZATION .......................................................................................................................................... 9 6.0 MATERIALS
HANDLING AND SPILL PREVENTION ................................................................................ 10 6. J Waste Mallagemellt and Disposal ........ .....................................
. ..................................................... 10 6.2 FI/els (lIId Materials Management .............. .. .................... .. ...................... .. .................
10 6.3 Cons/mclion Site Housekeeping ....................................................... .. . ........................................ II 7.0 DEDICATED CONCRETE OR ASPHALT BATCH
PLANTS .................................................................. .... 12 8.0 VEHICLE TRACKING CONTROL ........................................................................................
.......................... 13 9.0 INSPECTION AND MAINTENANCE PROCEDURES .................................................................................. 14 10.0 NON-STORM WATER DISCHARGES
.......................................................................................................... 16 11.0 CERTIFICATIONS .....................................................................
..................................................................... 17 11 .1 OWNERfApPLICANTCERTIFICATION ...................... .. ............ ....................................................
......................... 17 11 .2 STORM WATER MANAGEMENT PLAN ADMINiSTRATOR .... .... .. .. ........ ............ ................................ .......... .......... 18 12.0 ADDITIONAL
BMP REFERENCES ............................................................................................................... 19
Appendix A Appendix B Appendix C Appendix D Appendix E Table I. Table 2. LIST OF APPENDICES Site Map/Alignments Storm Water Application Form and Permit Storm Water Inspection Form BMP
Descriptions and Installation Details Project Seed Mixes Site Descriptions SWMP Revisions TABLES sourcJbas
sourcJbas 11.2 Storm Water Management Plan Administrator The SWMP Administrator is responsible for developing, implementing, maintallllllg, and revising the SWMP. This individual is
responsible for the accuracy, completeness, and implementation of the SWMP. SWMP Administrator Certification I certify under penalty of law that I understand the terms and conditions
of the SWMP and associated CDPS General Permit that authorizes storm water discharges associated with industrial activity from the construction sites identified as part of this certification.
Signature: Name: Tom Bojta Title: SWMP Administrator Date: Representing: Company: Rocky Mountain Natural Gas LLC Address: 82521 Y, Road Address: Grand Junction, Colorado 81505 Phone:
9""7""0c.:-2"'5.::.5--'.7.::..52"'2=--_____ _ SVCS Storm Water Management Plan 18
Legend D TownshiP o Section D QtrSeclion Parcel Line o 25 50 I I 100 Feet Author: jharris Date: 2/27/2013 Spring Valley Compressor Station Site Detail Ma sourcJbas DISClAIMER : This
Geographic Information System (GIS) and its components are designed as a source of reference for answering inquiries, for planning aod for modeling. GIS is nol inleoded. nor does il
replace legal description information in the chain of @e and other information contained in officialgovernmenl records such as the County Clerk and Recorders office or the courlS. In
addition, the representations 01 locations in this GIS cannot be substituted for actual legal surveys.
Legend = CountyRoads D Property Footprint o Township o Section o QtrSection Parcel Line o 250 500 I I I I I 1,000 Feet I I Author: jharris Date: 4/9/2013 Spring Valley Compressor Station
Relocation Site M sourcJbas DISCLAIMER ; This GeographiC Information System (GIS) and its oomponenls life designed as 8 source of refereno!l IOf answering Inquiries, lor planning snd
lor modeling. GIS Is n ot Intended, nor does II replace legs' description kltormation In 1he chlln 01 lille end ol/'ler Inlorma~on contained in official governrnen! records suei'! as
the County Clerk end Recorders office or the courts. n addUlon, the rep'8ssnlations d Iocslioos in th is GIS cannot be substituted lor actual regal SUfVeyS.
• 11 f_: 1(, !tAl _~k-·_-_-..,JU,;l_ ,~ --, --I \-\-H-\-H 1-\-\1 t i---,'t--.. ~-.., " -, '-'" -'",,",', ",j"" -, "",,"-,-~ f"'" ' "", " " " ','.."", "I" """ _, '," • """ -" " >',",
' -, " , " ~ -', -', "" '"' I I I I I I' IN 16 r I~ I I ~ I -~----t -I I I I '------:-.;"-
--. -";-_ ...• . 'Ii . \ ,-----~ i . i \'®. I i o~ i. ;;; \ \ \. \ \ • .• : " I , ,
John W. Hlckenlcoper, Govemar Christopher E. Urbina, MD, MPH Executive DIMmor and Chisf Medical Officer STATE OF COLORl\DO Dedicated to protecting and Improving the health and environment
of the people 01 Colorado 4300 Cherry Creek Dr. S, Laboratory Servioes Division Denver, Colorado 80246·t530 8too Lowry BlVd. Phone (303) 6W·2000 Denv.,., Colorado 80230-6928 Located
In Glendale, Colorado (303) 692·3090 http://www.cdphe.state.co.us September 20, 2011 Tom Boita, Operations Div Mgt Rocky Mountain Natural Gas 825211/2 Rd Grand Junction, CO 81505 RE:
Certification, Colorado Disellarse Permit System Permit No., COR030000, Certlfleatlrm Number: COR031184 Dear Mr./Ms. Boita; The Water Quality Control Division (Ihe Division) has reviewed
the application submitted for the Spring Valley Compressor Station fac1li1y and determined that it qualifies for coverage under the COPS General Permit for Stormwater Discharges Associated
with Construction Activities (the penn it). Enclosed please find a copy of the permit certification, which was Issued under the Colorado Water j Quality Control Act. ' Facility! Spring
Valley Compressor Station Garfield County Construction Activities: 011 and Gas Production and/or Exploration, Legal Contact (receives all legal documentation pertaining to the permit
cert/flcatlan): Tom Bolta, Operations Dlv Mgt Phone number: 970-255-7522 Rocky Mountain Natural Gas Email: tom.bolta@sourcegas.com 825211/2 Rd Grand Junction, CO 81505 Facility Contact
(contacted fat general Inquiries regarding the facility): Jay Fowler, Operations Field Coord Phone number: 970-928-0409 BIlling Contact (receives the invoice pertaining to the permit
certification): Tom Bolto, Operations Div Mgt Rocky Mountain Natural Gas 825211/2 Rd Grand Junction, CO 81505 Email: )ay.fowler@sourcegas.com phone number: 970·255-7522 Email: tom.boito@sourcegas.com
Any changes to the contacts listed above must be provided to the Division on a Change of Contact form. This form is available on the Division's website at coloradowaterpermlts,com. The
Annual Fee for this certification is $245.00, and is invoiced every July. Do Not Pay This Now. The Initial prorated Invoice will be sent to the legal contact shortly. Please read the
enclosed permit and certification. If you have any questions please contact Matt Clahor, Environmental Protection Specialist, at [303) 692-3575. Sincerely, tV,ItJf:4A'f' -/Debbie Jessop,
Program Assistant WATER QUALITY CONTROL DIVISION Enclosures: Certification paBe; General Permit; Highlight Sheet; Termination form xc: Regional Council of Government Garfield County,
Local County Health Department D.E., Technical Services Unit, WQCO Permit File /dkj cert ,I ,,I II, ! , I ,t ., •f
STATE OF COLORI\DO COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT WATER QUALITY CONTROL DIVISION TELEPHONE: (303) 692-3500 CERTIFICATION TO DISCHARGE UNDER COPS GENERAL PERMIT
COR-0300OOO STORMWATERASSOCIATED WITH CONSTRUCTION ACTIVITIES Certification Number: COR031184 This Certification to Dlsdlarge specifically authorizes: Rocky Mountain Natural Gas to discharge
stormwater from the facility identified as Spring Valley Compressor StatIon Spring Valley· Roaring Fork River, Colorado RIver Construction Activities: oil and Gas Production and/or Exploration,
Facility Located at: Spring Valley Rd & Old Dump Rd, Glenwood Springs, Garfield County, CO 81601 latitude: 39.477, longitude: ·107.222 CertificatIon Is effective: 9/20/2011 Certification
Expires: 6/30/2012 This certification under the permit requires that specific actions be performed at designated times. The certification holder is legally obligated to comply with all
terms and conditions ofthe permit. Signed, Nathan Moore Construction/MS4/Pretreatment Unit Manager Water Quality Control Division Page 1 of 22
Located In , Colorado http://www.cdphe.stat(J.co.us STATE OF COLOAADO RENEWAL COLORADO DISCHARGE PERMIT SYSTEM (COPS) STORMWATER DISCHARGE ASSOCIATED WITH CONSTRUCTION RENEWAL REAPPLICATION""
RESPONSE REQUIRED THE CDPS GENERAL PERMIT FOR STORMWATER DISCHARGES ASSOCIATED WITH CONSTRUCTION ACTIVITIES (COR030000) WILL EXPIRE JUNE 30, 2012 AND WILL BE ADMINISTRATIVELY CONTINUED
AT THAT TIME. For Additional Information, see the Q&A Guidance: http://www.cdphe.state.cil.us/wq/PermltsUnlt/PermlitingWhatsNew.htm o This reapplication form shows the current record
for the facility listed on page 2 -active certification COR031184 o For certification COR031184 to be administratively continued, this reapplication must be reviewed, corrected (if needed),
signed, and returned tothe division prior to March 31, 2012. This 15the only aclion necessary to renew this certification. o If certification Is no longer needed, please send In an inactivation
form as soon as the facility Is eligible. o Receipt of this form will be tracked on the Division's web site: http:Uwww.cdphe.state.co.us(wg(PermltsUnit(construction.html. Select: Active
Storm water Construction Certifications (this list will be updated In the first week of each month). A date entry under "Application Received" indicates the date the Division received
this renewal application. This also Indicates that the certification Is administratively continued. . o A postcard will be sent to confirm the Division's receipt of the form a certification
is administratively continued. Please allow up to 45 days for receipt of this·confirmation. o Certifications for which no renewal Is received will expire and be terminated effective
June 30, 2012. o Please keep a copy of this application lor your records. Please direct questions to cdphe.wqstorm@state.co.us, (303) 692-3517, or visit our website at www.coloradowaterpermits.com.
Mail to: CDPHE/WQCD Attn Permits. 4300 Cherry Creek Dr South Denver CO 80246 Photo copies, laxed copies, pdl copies or emails will not be accepted by the Division. REVIEW AND CONFIRM
THE FOLLOWING INFORMATION IS CORRECT (Verify That This Information Is Correct. Cross out and make changes as necessary.) APPLICATION to RENEW CERT # COR031184 30. CONTACTS: PERMITTEE
ORGANIZATION FORMAL NAME Rocky Mountain Natural Gas LEGAL CONTACT (This Is the party who mustslgn on page 2) Tom Bolta, Operations Dlv Mgt 82S 211/2 Rd Grand Junction CO 81505 Phone
970-255-7522 Emailtom.bolta@sourcegas.com LOCAL CONTACT Jay Fowler, Operations Field Coord Phone 970-928-0409 Email jay.fowler@sourcegas.com Organization: __________________ _ Mailing
Address: _______ ~----------City:, _________ State: _____ Zip: ___ _ CONTINUE TO BACK OF FORM
ConstructIon SW Renewal Appllcatlon 2012 Cert ttCOR031184 Rocky Mountain Natural Gas Facility Spring Valley Compressor StatIon page 2 BILLING CONTACT Tom Balta, Operations Div Mgt =..".'
"'...~. " '·=======,"~.Rl'-ckY'MtnmtllIIf.NlnUi'l!I'Gl!lasF======================"-"-"--'-+ 825211/2 Rd Grand Junction CO 81505 . Phone 970-255-7522 Email tom.boita@sourcegas.com 2.
PERMITIED PROJECT/FACILITY INFORMATION Verify That This Information Is Correct. Cross out and make changes as necessary: Project/Facility Name Spring Valley Compressor Station Address
Or Cross Streets Spring Valley Rd & Old Dump Rd City Glenwood Springs County Garfield Zip Code 81601 Facility Latitude 39.477 Longitude -107.222 Total Area Of Project Site (Acr.s):S
Area Of Disturbance (Acres) 8 Nature Of Construction Activity 011 and Gas Production and/or Exploration, Immediate Receiving Water(S):Sprlng Valley Ultimate Receiving Water(S): Roaring
Fork River, Colorado River 3. SIGNATURE OF PERM ITLEGAL CONTACT "I certify under penalty of law that this document arid all attachments were prepared under my direction or supervision
In accordance with a system deSigned to assure that qualified personnel properly gather and evaluate the Information submitted. Based on my inquIry of the person or persons who manage
the system, or those persons directly responsible for gathering the InformatIon, the information submitted Is to the best of my knowledge and belief, true, accurate and complete. I am
aware that there are significant penalties for submitting false Information, Including the possibility of fine and Imprisonment for knowing violations." III understand that ~ubmlttal
of this application Is for coverage under the State of Colorado General Permit for Stormwater pischarges Associated wIth Construction Activity for the entlretv of the construction site/project
described and applied for, until such time as the application Is amended or th,e certification is transferred; Inactivated, or expired." XX 4'Q;. .64i??. . . 2-1?';.?O("L. Signature
~f Legally R~sponsible Person listed in Item 1 (submission must include original signature) Date Signed . /0 d1 BOI( h., CPM~:; P2/tYJ/~,F£ Name (printed) Title' ()/I/Per Regulation
611n all cases, APPLICATION shall be signed as follows: dd) In the case of corporations, bya responsible corporate officer. For the purposes of this section, the responsible corporate
officer Is responsible for the overall operation of the facility from whIch the discharge described In the applicatIon originates. b) In the case of a partnershiPI by a general partner.
c) In the case of a sole proprietorshIp, by the proprIetor. d) In the case,of a municIpal, state, or other public facility, by either a' principal executtve officer or ranking elected
official WQCD Mall Code 2034 Tom Bolta, Operations D1v Mgt Or environmental permitting representative for: Rocky Mountain Natural Gas 825211/2 Rd Grand Junction, CO 81601
STATE OF COLORADO Dedicated 10 protecting and improving Ihe health and environment 01 the people of Colorado 4300 Cherry Creek Dr. S. Denver, Colorado 80246·1530 Phone (303) 692-2000
TDD Line (303) 691 ·7700 located in Glendale, Colorado http://www,cdphe.state.co.u5 MODIFICATION FORM Colorado Department of Public Health and Environment Please print or type all information.
All items must be filled out completely and correctly. If the form is not complete, it will be returned. All modification dates are established by the Division. This form is for modifying
an established permit or certification. Terminations, Change of Contacts, Transfer of Permit, and Withdrawl of Permit Application and/or modification requests must be submitted on the
appropriate form: MAIL ORIGINAL FORM WITH INK SIGNATURES TO THE FOLLOWING ADDRESS: Colorado Dept of Public Health and Environment Water Quality Control Division 4300 Cherry Creek Dr
South WQCD-P-B2 Denver, CO 80246-1530 FAXED or EMAILED FORMS WILL NOT BE ACCEPTED. • PART A. IDENTIFICATION OF PERMIT Please write the permit number to be modified PERMIT NUMBER (Prefix
+ 6 digits -not ending in ()()()()) COR031184 • PART B. PERMITEE INFORMATION Company Name _R_o_c_k..:,y_M_o_u_n_t_a_in_N_a_tu_r_a_I_G_a__s _ _______ _ _____ MailingAddress _6_0_0_12_t_h_S_tr_e_e_t,'-
S_u_it_e_3_0_0 ______________ _ City Golden State _C_O ___ ---------------Phone legal Contact Name _T_o_m_B_o_it_a ________ Number _9_7_0_-_2_5_5_-7_5_2_2 ____ _ Zip code _8_0_4_0_1
_ Title Operations Division Manager Email Tom.boita@sourcegas.com • PART C. FACILITY/PROJECT INFORMATION Facility/Project Name Spring Valley Compressor Station location (address) South
side of Red Canyon Road, 1.29 miles east of CR 114 in Garfield County City Glenwood Springs County _G_a__rfie_l_d __ _____ Phone local Contact Name _J_a.,::y_F_o_wl_e_r_ _______ Number
_9_7_0_-_9_2_8_-_0_4_0_9 ______ Title Operations Field Coordinator Email Jay. fowler@sourcegas.com Page lof2 form last revised January 2010
sourcJbas ROCKY MOUNTAIN NATURAL GAS LLC 82521 Yz Road Grand JIII/Cliol/, Colorado 81505 RECLAMATION PLAN SPRING VALLEY COMPRESSOR STATION Garfield County, Colorado April/2013 -Rev #
0
RECLAMATION PLAN SPRING VALLEY COMPRESSOR STATION sourcJbas PREPARED FOR: ROCKY MOUNTAIN NATURAL GAS LLC 825 21 It, Road GRAND JUNCTION, COLORADO 81505 PREPARED BY: HRL COMPLIANCE SOLUTIONS,
INC. 2385 F Y, Road Grand Junction, CO 81505 970.243.3271 DATE PREPARED: Apri12013
sourcJhas 1.0 Introduction ................................................................................................................. 1 2.0 Site Characteristics ...............................
...................................................................... 2 3.0 Final Reclamation .......................................................................................................
3 3.1 Stage One (Removal and Disposal) ....................................................................... 3 3.2 Stage Two (Substrate Preparation) ................................................
....................... 3 3.3 Stage Three (Planting/Timing) .............................................................................. 4 4.0 StOI'lU Water Mitigation .............................
................................................................ 5 4.1 Best Management Practices (BMPs) ..................................................................... 5 4.2 Reclamation
Monitoring ........................................................................................ 5 5.0 References ..................................................................................
.................................. 1 APPENDIX A APPENDIX B APPENDlCIES MAP OF LOCATION APPROVED SEED MIX SVCS Reclamation Plan
1.0 Introduction This Rec lamation Plan (Plan) describes procedures necessary for the reclamation of the Spring Valley Compressor Station site on the south side of Red Canyon Road, 1.29
miles east of C.R.114 in Township 7 South, Range 88 West, Section 3, NW y.; NE y.; in Garfield County, Colorado. This Plan will cover fe-contouring, reseeding, noxiolls weed treatment,
stonn water mitigati on and monitori ng of the site. The plan is twofold: reclamat ion of the site once the compressor station has been built and reclamation of the site when the compressor
statioli is no longer in operation and has been taken out of service and in frastructure has been removed. The reclamation of di sturbed land is a critical component when creating a
system where ecological functions and values are restored once the ground disturbance activities have ceased. Rehabilitation of the di sturbed area assists the natural eco logical processes
to move towards a self-promoting condition. Once a self-suppotting environment has been established, the natural processes of the location can take over and continue the rehabilitation
processes with minimal intervention from outs ide parties. The costs associated with the rehabilitation process will be minimized to the operator if proper treatments are applied initially
to ensure the best environment possible for rehabilitation treatments to succeed. Bonding is required for oil and gas lease operations (43 CFR 3 104, 36 CFR 228 E). The operator must
identify which bond will be utilized to provide the coverage. The bond will cover the activities the operator perfOt111S including, but not limited to: plugging leasehold wells, surface
reclamation, and cleanup of abandoned operations. The Colorado Oil and Gas Conservation Commission (COGCC) 1000 Series Reclamation Regulations declare that reclamation acti vities will
take place no later than 12 months after operations stop on non-crop lands. This plan is designed to provide guidance conceming reclamation activities for Rocky Mountain Natural Gas
LLC land managers once the site of concem is no longer utilized for operations. The area to be reclaimed shall be kept as weed free as practicable of all undesirable noxious weed species.
Weed control measures shall be conducted in compliance with the Colorado Noxious Weed Act (C.R.S. 35-5.5-10I.et.seq). Storm water mitigation will be in compli ance with the Colorado
Depattment of Health and Environment (CDPHE) Water Quality Division Gene ral Permit Series COR-030000 and COGCC 1002.f regulations. Procedures identified in this plan apply only to the
defined area of the Spring Valley Compressor Station location. PersOtUlel working on this project should be familiar with the recl amation plan and its contents prior to preliminary
construction activities. SVCS Reclamation Pl an
sourcJbas 2.0 Site Characteristics The community of Carbondale is the nearest population center approximately 5.33 miles south of the facility. It is located in Township 7 South, Range
88 West, Section 3, NW 1. NE 1. in Garfield County, Colorado. The location is approximately 7,197 feet in elevation and receives around 18 inches of precipitation per year. The frost
free period ranges from 80 to 95 days, creating a growing season of approximately three months. According to the Natural Resources Conservation Service (NRCS), the soil type(s) within
the disturbed area of this Project consists of two (2) general soil units. • Empedrado loam (6 to 12%): This deep, well drained, soil is on fans and upland hills. Elevation ranges from
6,500 to 9,000 feet. Average annual precipitation is 15 to 18 inches, average annual air temperature is 40 to 44 degrees and the average annual frost-free period ranges from 75 to 95
days. Permeability is moderate, available water capacity is high, and effective rooting depth is approximately 60 inches. Surface IUnoff is medium and erosion hazard is moderate. Native
vegetation is mainly wheatgrasses, needleandthread, prairie junegrass, mountain big sage, Douglas rabbitblUsh, muttongrass, Lettennan needlegrass, snow berry, and Utah serviceberry.
• Showalter-Morval complex (15 to 25%): This map unit is on alluvial fans, high terraces, and valley sides. Elevation ranges from 7,000 to 8,500 feet. Average annual precipitation is
14 to 16 inches, average annual air temperature is 42 to 44 degrees and the average annual frost-free period is 80 to 90 days. ShowalteJ' makes up 45 percent of the map unit and Morval
makes up 35 percent. Showalter soil is deep and well drained. Penneability is slow, available water capacity is moderate and effective rooting depth is 60 inches or greater. Surface
runoff is medium and erosion hazard is moderate. Native vegetation is mainly bluebunch wheatgrass, western wheatgrass, prairie junegrass, Indian ricegrass, Mountainmahogany, antelope
bitter blUSh, Saskatoon selviceberry and big sage. Morval soil is deep, well drained. Permeability is moderate, available water capacity is moderate and effective rooting depth is 60
inches or greater. Runoff is medium, and erosion hazard is slight. Native vegetation is mainly needleandthread, western wheatgrass, muttongrass, prairie junegrass, and big sage. SVCS
Reclamation Plan 2
sourcJbas 3.0 Final Reclamation This plan is twofold: reclamation of the site once the compressor station has been built and reclamation of the site when the compressor station is no
longer in operation and has been taken out of service and infrastructure has been removed. Reclamation processes will occur no later than 12 months after activity ends and reclamation
activities will be in compliance with CDPHE and COGCC regulations. Series 1000 Rules. In accordance with Garfield County noxious weed management, noxious species will be treated before
construction activities begin. Dust suppression measures are required under the Garfield County grading permit, and will be implemented when applicable. Each stage will be applied to
the reclamation of the compressor station location. Interim reclamation will be completed as stated in the Storm Water Management Plan. All equipment used on this reclamation project
will be cleaned and inspected prior to entering location to ensure no noxious weed seeds are being transpOited onto the site. 3.1 Stage One (Removal and Disposal) During reclamation
of the site, once the compressor station has been built, all wooden stakes used to secure wattles and straw bales and other waste associated with constlUction of the site will be disposed
of properly. This includes any trash left behind on location such as pipe fittings, used lumber or miscellaneous items that have been discarded. Petroleum products if on site should
be contained in secondary containment. Gravel, road base and large cobbles will be installed on site for surface stabilization. Temporary fencing will also be installed during operations.
During final reclamation of the site when the compressor station is no longer in operation, all manmade stlUctures will be removed from the site by means of backhoe, bulldozer, skidsteer
or other appropriate heavy machinery. Structures may include, but are not limited to: compressor engines, generators, steel sttuctures, cement foundations and other equipment used for
the compression process of natural gas. Petroleum waste products if on site should be contained in secondary containment and disposed of properly. Gravel, road base and large cobbles
installed on site for surface stabilization controls will be removed. Disposal and/or reuse method of gravel will be left to the discretion of the operator. Temporary fencing put in
place during operations will be removed. Existing fence lines or historic fence lines within the designated area of the 4.273 acre site will be repaired, replaced, or removed as agreed
to by Rocky Mountain Natural Gas LLC. 3.2 Stage Two (Substrate Preparation) In both phases of reclamation, the condition of the soil is very impOitant for the establishment of a healthy
self-sustaining environment. Locations where the soil has noticeable spills will have the contaminated soil removed or remediated, and disposed of in accordance with Garfield County
and COGCC waste management regulations. During active operations, most of the area sutTounding the operating compressor station will be re-graded and seeded or stabilized using gravel,
road base, or large cobbles. SVCS Reclamation Plan 3
sourcJhas Topsoil will be segregated and placed into stock piles surrounding the site. These topsoil stock piles will be seeded. In the phase of fin al recl amation when active operations
have ceased the substrate will be void of chemical presence, and gravel that was applied to the location during operations removed. To a lleviate soil compaction, the substrate will
be cross ripped to a depth of 18 inches. Cross ripping will take place when the so il moisture is below 35 percent of fi eld capac ity. The cross ripping is specified by the COGCC under
the 1000 Series Rules. The substrate shall be contoured to emulate the surrounding lands topography. Pre-disturbance photographs and visual extrapolations are to be used to create this
contour. Historically this s ite has had gentl y s loping pre-existing contour elevatio ns with no major drainages to replace. The soil used to contour the landscape will be applied
in accordance to the order it was removed (i .e. first off, last on). This practice will ensure that the soi l is applied to the appropriate horizon from which it was taken from initiall
y. Salvaged topsoil will be distributed across the entire di sturbed area at a depth of six (6) to twelve ( 12) inches depending upon the landowner use agreement if possible. Should
there be a sh0l1age of topsoil ava ilable on site, the contractor will be responsible for replacement of lost or degraded topsoil with topsoil imported from an approved and cel1ified
weed-free source. 3.3 Stage Three (Planting/Timing) In both phases of final reclamation, seedbed preparation will consist of sca ri fy ing, tilling or harrowing seedbed to a depth of
three (3) to four (4) inches post ripping. This will occur just prior to seeding. Drill seeding will be performed at a depth of 0.5 inches, seed will be covered with soil and lightly
compacted to ensure good seed to so il contact. Seed will be applied using a rangeland seed drill with a seed release and agitation mechani sm sufficient to allow seeds of various s
ize and density to be planted at the proper seeding depth. The seed mix for this reclamation project will be an approved Seed Mix (Appendix B). Cel1ified weed free straw will be applied
at a rate 2,000 Ibs/acre and crimpled in place following drill seeding. Ideally pl anting will occur in the fa ll, before the fi rst snow of the season, early-October is optimal. If
possible, pl anting should occur in juncture with a predicted precipitation event. By positioning the seed below the snow fall or rain, the seed will receive good contact with the soil
and utilize the benefits of the precipitation. Spring pl anting can be conducted after the frost line is gone from the soil. During both phases of final reclamation, the Seed Mix associated
with this project will be used. SVCS Reclamation Plan 4
4.0 Storm Water Mitigation 4.1 Best Ma nagement Practices (BMPs) To avoid erosion of topsoil and seed transp0I1 from storm events, Best Management Practices (BMPs) will be installed
where applicable on the perimeter of the location. Given the location of the site, surface roughening, and pocking will reduce storm water impact and capture and retain prec ipitation.
This will aid in the germination of the seed and increase seedling survival. 4.2 Reclamation Monitoring Monitoring of the vegetative progress is vital to ensure that proper procedures
were implemented on the location. Monitoring will allow for early response to potential problems encountered during the reclamation process. Identifying challenges to the reclamation
goals at an earl y stage will allow for adequate time to formulate a response to the situation. By identifying potenti al complications early in the process, the future costs associated
with rehabilitation will be minimized for the operator. If the treatments do not show the desired outcome, additional actions will be taken to reach reclamation goals. Aft er the source
of the probl em is identifi ed, careful attention will be paid to the timing of the supplemental treatment. If treatments such as seeding are not carried out at the proper time, the
treatment will not be effective and the operator will effectively increase rehabilitation costs. Monitoring activities will examine several parameters including: the condition of implemented
BMPs, growth state and success rate of areas seeded, presence and location of noxious weeds, and possible sources of failure for reclamation processes. Photo documentation is required
for all the above parameters for high-quality progress tracking. After the initial reclamation amendments are appli ed, and CDPHE requirements of 70 percent pre-disturbance levels have
been met as well as COGCC requirements of 80 percent vegetative cover are met, a tri-annual monitoring scheme will be impl emented. Monitoring activities will occur in the spring, summer
and fall. Qualifi ed individuals will carry out visual surveys and transects on site. Monitoring will occur until COGCC requirements of 80% desired vegetation has been reached. SVCS
Reclamation Plan 5
5.0 References Colorado Oil and Gas Conservation Commission (COGCC). 2008. Rule 1000 series U.S. Geological Survey (USGS), variously dated, National field manual for the collection of
water-quality data : U.S. Geological Survey Techniques of Water-Resources Investigations, book 9, chaps. A I-A9, available online at: http: //pubs.water.usgs.gov/twri9A SVCS Reclamation
Plan
Appendix A Site Map
Legend --Perennial Stream --_. Intermittent I Ephemeral Stream ~ Canal! Ditch 1::1 Township D Section o 2,000 4,000 N W~E 8,000 Feet V I S Author: jharris Date: 2/27/2013 Spring Valley
Compressor Station Site Vicin M sourcJbas DISCLAIMER : This Geographic In!oonation S~slem (GIS) and its components are designed as a source of reference for answering inquiries, for
planning and for modeling, GIS is not in tended, nor does il replace legal description information in tile chain of tille and other information contained In oHiclal government records
such as the County Clerll and Recorders office or the coons. In addition, Ihe representalions of localions in this GIS cannol be subs1ituted for actual legal surveys.
Legend --Perennial Stream --_. Intermittent /Ephemeral Stream r-T""T"'T""I Canal I Ditch ClTownShiP C] Section o 2,000 4,000 N W~E 8,000 Feet V I S Author: jharris Date: 2/27/2013 Spring
Valley Compressor Station Site Vici sourcJbas DISCLAIMER : This Geographic Informa1iOfl System (GIS) and its components Bfe designed as a SOUfce of reference for answering inquiries,
for plaming and for modeling. GIS is nol Inleoded, nor does it replace legal description information in the chain 01 title and other informaHon contained in official govemment records
such as the County Clerk and Recorders olflce or the courts. In addition, the representations of locations in this GIS cannot be substitu ted for actual legal surveys.
Appendix B Seed Mix
Dry Land Pasture Mix Species Seeding Rate Pure Live Seed (PLS)* Mountain brame 2.3 Falcatta alfalfa 2.25 Orchard grass 2.18 Indian wheatgrass 2.11 Quick guard 2.05 Crested wheatgrass
1.07 Pubescent wheatgrass 1.27
DONOT CUI LEADER. I\PPROVED STRAP AAOI..IKl TREE AT ENOOF£ACIIWIRE lIE. 12 GUAGE O ..... VN'lIZED WIRE. OOIJ8I.E STRAND. TWISTED; PROVIOE l GVY SYSIEMS EOUf. DISTANT AROVND TREE. 112'
00\. X l8'lONGWliIlE PVC PIPE SECTION OIl ..... l GUYING. PlANT TOPOf' ROOT8AU,AT fINAl. GRADE WI ~/ATER RING. FORM SDIl INIO)' WAIER RING AROOND IREE 8ASE AT TIME Of I'I..N'ITiNO. WESIERN
RED CEDNlIA.ll.CH PlAHT RING SCARIFY W ..... l S OF Pl.AHT HOlE PRIOR TO SEmNO ROOT BAlL SPECIFIED Sl AKES ORIVEN flUSH WIIH GRADE. SPECIFIED 8 ACKFill MIXTURE WITH fE IUlllZER APPlICATION.
SET ROOI BALL ~UNDISTUR8ED SIJ8SOIl PEDESTAL. GIll' TREE PER QIAGIV.M. 0::,e~; reen Tree Planting Detail PRUNE ALL D""IAQ£D OR DEAD WOOD IMM EDlAlEl Y PRIOR TO PI.ANTING ~~~~~~~~~ SET
SHRI.8 2" ..cHER ItWI TliE HEIGHT • wtlCH IT GREW rDIUI SOil INTO 3' WAIER ~ AROIJND IREE lASE AT nME Of I'I..N'ITING weSteRN RED CEDAR MlA.CH!'LANI RING VNDISTVRe ED $I.!6OFtADE lOOSEN
SIDI:S OF I'I..N'II PIT CD ~r,~,b Planting Detail Seed Mixture and Notes It9dy~So!d~""O'JIIf"'",,_(Io_ ca..o.. nc.o..n..-fSIoeoo.cdmt!."..".."..' I!!!!' N_ c.-I\b)Ioa,....~ N>oItto ~\\~O"""'~!A
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WIt.5l'~Spl ~Hl. l ~O'Sp<I. ~ HI.l ~Sp1 'HU 'W ICI'll. l 'Spd. IO'Il.U'Spd. Na!I'o' ... A~_JI'OIl' ...... bo_ID_9OO'I-" ....... pt'p<IIOO\I~""'""" .. """"'IIIO..-:y. no. ...--__ --,.."....,~1oo0ftll"
""'"'sl .. """""........,_ ..... "" .. ... 1ondocapo_.1nt """"""_ ..... ~otoJdboOd>ry..., .... __ bt_"""-9I..,.I>O\lt>t ... ..,d""'9"IIIO~' _.~_ ... ~ .... _..".-_ID_~"""""_Mtt"'ihl
~.....,.,_ ..,.bn ... on<I~~IIrfIIo)I<IOf_rt>rt __ l!IIf.tOI.'OI11 •• ~ ..... ..u1o...c ___ 00Mb. _ooI%_~I"'9ft~. ~lobo~""NInI"""~ ........ .. ..,t .... pIonI~ .. Lft _.., woI """O<I.M;iIIonaIwoIom9"
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''''_~.., __ rIn'.odon OO>J IOU ~ rI'IUIU'tI bt!tn ... ~ O. GJ,on<Isw.~_~_~ ... I>:IaIocI. NORTH f)0 LANDSCAPE LEGEND e e EVlifgtl!OO T/MS Pop/al TlBeS ee® large DecDJous ShoVbs I. ..
.. .. . I Nattv. SHd AI Obturbance Ateas 30' 60' t)~~ ~ ~ 0~~,~ ~ ~ ""0. " ~~~ 0 ~ ~~ !!; ~ w o~ "" <0 00 N B ~ , ;0 0 " ~ "• ~ ~ <t: .o. 2 0 -l .,,' ~. a::: ;I":l ~ (0 =" ~ . MD. ISSUED
FOR: No Date RemaI1<.. PROJECT NO: 13106 PHASE: CD DRAWING TITl E: OVERALL lANDSCAPE PlAN SHEET NUM8ER L1 DA.TE: 0612512013
I. I I I, . I I I I I tJ I I I • "''------tu' I !J!I "w' I ~I ';'1 ~I 01 ~ I ::;;1 ~ NATIVE . SEED. ALL' . QISTURSANCE. • A. RE, AS, ' -lPON • • TANKS 2PON D ST-100 . -'-..... SEfZD
ALL . . . . DiStURBANCE . . . 'AREAS • EVe/green Trees • ~ ... -... large Oeciduous Shrubs .-.........:: . '" ... ~ .... 0'-""""": • • Natlv. Seed AI Disturbance Aleas PopI¥ Tries 2SSK
10' ~ 20' ~oo ~ o~~ ~ ~~~ ~ ~~. w~U~o a" ~ a" e ~~ ~w oa ~ 1i~ N ~ B ;;; , 0 U ~ ~ ~ e , « •o .02 cr V -1 _ ... ai 0:: ;I l•l ~ (0 <= '" . M Q. ISSUEOfOR: NO Oate IW ........ PROJECT
NO: 13 '06 PHASE: CD DRAWING TnLE: LANDSCAPE PlAN SHEeT NUMBER L2 DATE: 0612512013
w z :::J J: ~ 5GoA ~ ~ ~ ~ . .. " -~ : .... :. 2MMA" " -: " : ..: --. ~2SS~ , " . " " "' . .. 11 POP .,..---XFMR , " NATIVE -SEED ALL . PLANT POPLARS ALONG EXISTING DITCH NEXT TO THE
FIELD COMPRESSOR BUILDING FF~7176 PIPE RACK I I I I I LANDSCAPE LEGEND Large OeOO..oooJs Shrubs I PopIaf Trees I I DFUELGAsD V-200 I --I I I ~ NORTH f) ~oo ~ ~~~ ~ :J:~~ ~ ~~a. 00 ~
~~j "~ ~ o~ ~w o~ w ~~ N ~ "~ :;; ~ 0 ~ "• ~~• « ~o ....J 0:: :2 c <1l a.. ", U ~. ;q (g :: ~ . M Q. en Q) 0 () g-l::> >. U ~ CI) (/) 0 l::> -i-U C 0 <1l t) > ....J " cZ' Cl .Q § I:
10 0 ".::: U5 t) Q.~l::> en 0 Qi :!l'E C) Q) <1l en C. (9 E o t) ISSUED FOR; No Date Remarlll PROJECT NO: 13106 PHASE: CD ORAWlNG TITLE: lANOSCAPE PlAN SHEET t«..IMBER 0~......;1i0;,·,
"""",,;2;;0' L 3 DATE: 0612512013
~ ~ .'::"::> Cl. en () "'C"D "U '::"::> ~ o ~ q q" ~i ~ • !':l ~ § r ~ ~ .j:::.. ~ g ~ ~ ~ ~ .~. ~ 0 0 ~ 1 1 I \ \ \ \ ~I 1 7 ~~ '11 /!l! JPVfft /JI$ c:: j J!! it/fJ3 ~ 18 7.~ 1:::tJ
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,~< . z 'r 'm ,," () (:'7' .. " m ~ ' "', .:: ~ .' ~ , ;:: . ~ ~ .. MATCH LINE -SEE SHEET L3 SG Spring Valley CS Compressor Station Landscape Plan Garfield County, Colorado , ! I /I
/", //'", /'" , /' '-/.. I ///'-J //0" j I I /'" ///, /' I , ' j ' , //" ' /' /. ~ /'" , . , ~ /.. /I //L II I ro //:x; 0 rr <l> m ~ ro o z ///////! . nc • j t . , .. ; ~~ [ , I . i
.. iii: . .. ~ , ~ i , ~ • = M RLA MITCH REWelD lANDSCAPE ARCHITECT LANOSCAPE ARCHITECTURE ANO LAND PLANNING 386341 Road Palisade, Colorado 81526 (970) 434-1155
~ ~"~ '" !!' :::J "• C(f)l . q (") q ~ CD -u or :::l 0 q "q ~ m § r § (J1 " • • Q CJ)CJ) ' :t> .-1 m ' ::D cmz ,~ .ffj p ~. , CJ) ,:zt> o:t>r n< , , , "Z "Z , ', ~,' , , , , . • . "'",
~ \~ ' S: s: ~-, ;p '~ r 'm • GJ. .§; , ~: " • ~ , '" MATCH LINE · SEE SHEET L6 , , I, -~-,-i ~7~ ~ '-, -: 1 /, t< /, , I • I , ' ' ,/;. " " "I [, :/' /' , , • , , [, ,, , :/,' , :/,
, 'I ~_~ !:t. , /: ,., 3! '" i Z " , ,. " , , CJ) FHz 'O, ':-t>I . :t> ,< Frn • " 1 ' , , , " . :;1 , , " , /, ,, , l .. [,' , '/" i , ./, , I, I< J " 1. , , , 'I ,I i' , . '/./" ,I
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'/.,,'105 ' t'2 Q • 16 ' ' ;!l} , (:). 1,1$ ' I;""Y. ' , ~ ~ . ,'/~' , I, , I./Jj , ' ' , , , , J 'j. , " ;. ~ ,~ o , • " ell ~ :!i /f~'j ",, ' ' ,l ' , , ~ ~ 'V' , ,, , . /i , t " I
" , j ,./,, ., . . ' 'I ' , \ I, , I I ,,' /, , " , ' , , , '/I , " " ,' I .-1 ~ (:) O r: .m " l .,/: I " -.......1 ,, /' N , ~~ •% ~ 0 ~~ m ~ o Z § ~ ~ •m ~ ~ > y \-/, ' " /. I' V 1
I" ---------'-,L • • % > ~2 !\lP; 0 " o Z 0 " ~ Z '-IIIIIIIIIIIIIIII!II I ~ . , 0 , f ' , ' -/" , __ L _ , __ _ _ _ MATCH LINE · SEE SHEET L2 SG Spring Valley CS Compressor Station Landscape
Plan Garfield County, Colorado i 5 I [ • f ! ;; • i ~ . f • [ ~ ~ M R LA MITCH REWOlO LANDSCAPE AACHITECT lANDSCAPE ARCHITECTURE AND LAND PLANNING 386 34 ~ Road Palisade, Colorado 81526
(970) 434·1155
1 //' ~ ~ -.J Z 0 j g a ~ a: Y! 0 , ~ . ( 1 • • 1 • 1 ;-' I 1 • /-'~I . ' , • , • I ' _ ' 2SSK ' ~ .,. , , . , 1 •• /-.i..~.2M~A. -. 7180 • -7210 /1 1 /1 1 I 1 I . -I . 1 I . ) { PIN.
• 2PON • • • • , • • • · NATIYJ:;, ' , ·SEEE>f.L~ · • DisTURBANCE .AREAS' ~---· • ---~ !c-CONTROL ROOM • • .-• • • • • • I I -I Ev«greel1 l fte, I I I L_rge Deciduous Shruln I I ' .
, I I ~ ~ " . 1 Nallvl Seed AI Oisturbaoce NUS '-"' ~ • I WI 1f'~~ _ I ~ liJj I ';' I ~ 113 I~ I ::; I I I I I I I I I I I I I I I I I I I I NORTH (J o 10' 20' t= ''"" ~ ~ ;0 o ~ ~ ~
0 .'0 Ii" ~,,; ISSUED FOR; ~N ~';'ij ~Q. No Date RefMII<s PROJECT NO: 13106 PHAse: CD DRAWING TITlE: LANDSCAPE PlAN SHEET NUMBER L6 DATE: 0612512013
Noxious Weed Management Plan Spring Valley Compressor Station Prepared for: ourcJbas Rocky Mountain Natural Gas LLC ~2~ 21 V2 Road Grand Junction, Colorado ~ 1 ~O~ June 2013 Prepared
by: IReSI ISI'\KOSI\fSfl\ rt\~~I U"\ TS HRL Compliance Solutions, Inc. 2385 F ~ Road Grand Junction, CO 81505
Table of Contents 1. Introduction" """ "" "'''''''''''''''''''''' """ """""" "" "'''' ,,,,,,,,,,,,,,, '" "", "'" '" ""','" """ ,,,,, ," "," I 2. Site Characterization,,,, ,," "'," ,,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,, ,,"'"'''''' ,,,' "" "'''' "'" ""'" """,," ,," '" I 3. Weeds of Concern ""''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''"""""" """""" ""'"''''''''''''''''
2 4. Weed Inventory "'"''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''"""" """"'''''''''''''''''''''''''''''' j 5. Treatment Methods """"" '"'''''''''''''''''''''''''''''''''''''''
'''''''''''''"'"'''''''''''''''''''''''''''''''''''''''' j 5,\ Preventative Methods,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, .. ,,,,,,,"""""""""",,,,,,,,,,,,,,,,,,,,,4
5,2 Cultural Methods' ''''''''" .. ,''''''''''''''''''''''''''''''''".".. ... ,,''''''''''''''""".""",,,,,,,,,,,,,,,,,,,,,,,,,,,,, 4 5J Physical and Mechanical Methods"""", .... """""""""""""""""""""
""""',,.,,""""""""'" 4 5.4 Biological Control Methods,,,,,,,,, ........ ,,'"'''''''''''''''''',, ......... ,''''''''''''''',,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,4 5j ChemicalC ontrol "" ""'"
".. ... ,,""" "'"" '" ", .. ,',""'" '"'',''''''' "'''''''' ".. .. ,"""'''''''' '."'"" "",,,,,, 4 6. Treatment Recommendations,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,"."""""",,,,,,
.. ,,,,,,,,,,,,,,,,,,,,,,,4 6, I Spring Valley Compressor Station Pad Surface """""" ....... """"""",, ... ,,""""""""""""'" 4 6,2 ROWs and Land SUlTounding the Spring Valley Compressor
Station"""", ....... ,,""""""'" 5 63 Special Requirements""""",,,,,,,,,,,,,,,, ... ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,5 7. Management Strategies
""" '".. ... "'"'''''''''''''''''''" ........ ,,''''''''''''''''''',, .. ,,''''''''''''''".'''''' "',"5 7, I Prevention"""",,, ,,""," '"'''''''''''''''''''''''' ,,',' ".. """""""'" ""
",,'" ''''''''','''''''' ".. .. "'" '''''''''''' 5 7.2 Revegetation and Rehabilitation'' ', """'"'''''''''''''''''''''''''''''''''''''''''' '''''''''.,,'''''''''''''''''''''''' 5 8.
Conclusion """'"''''''''''''''''''''''''''''''''''''''''''''''''''''''''''""""",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,6 9. Amendments"",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,"'"'''
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' 7 10. Noxious Weed Management Resource Guide "'" "'" , """ """ " " " "" " "" "" " " " " ",," " " " " 8 11. References"" "'"
"" """""'" """ """" ",' "", ''''',,' '" ''''''''',' ""'"'''''''''' "" ""'''' """" """" ""'" 9 List of Figures Figure 1.. .............................................................................
Overhead Map Figure 2.. ............................................................................ Soil Type Map List of Appendices Appendix A... ..................................................
Noxious Weed SurveyR eport Appendix A.t............................................................... ..... Soil Description Appendix B.. ..........................................................
Colorado State Weed List Appendix C.. .................................. Garfield County Weed List and Descriptions Appendix D... .....................................................................
.. AnnuaI SurveyM aps Appendix E.. ...................................................N oxious Weed Inventory Form AppendixF .. ................................................ Noxious
Weed Summary Documents SVCS Noxious Weed Managemen( Plan
1. Introduction The Colorado Noxious Weed Act (C.R.S. Title 35, Article 5.5) declares that certain undesirable plants constitute a threat to the "continuous economic and environmental
value of lands of the state" and requires that these "noxious weeds" be managed on private and public lands. The Act further declares that control of noxious weeds should use methods
that are least damaging to the environment but also practicable and economically reasonable. The local government charged with management of noxious weeds for the Spring Valley Compressor
Station (SVCS) is Garfield County. Garfield County requires that land owners or persons or entities leasing the land within the county, manage noxious weed infestations on their respective
land. Rocky Mountain Natural Gas LLC (RMNG) will be responsible for management of noxious and undesirable species identified on land leased associated with the SVCS. By implementing
a Noxious Weed Management Program, negative economic and environmental impacts will be minimized for RMNG and the sUlTounding stakeholders. Maintaining control of noxious weed populations
within RMNG land is important to keep the cost of noxious weed abatement, stonn water, and revegetation to a minimum. Since the three (3) elements are intertwined; improvement in one
(I) area will facilitate improvements in the other areas of conce1l1. It is also vital that the expansion of noxious weeds from RMNG land to private land, not associated with oil and
gas exploration, is monitored closely to ensure weed abatement measures are effective. For the most successful management of noxious weeds, regular communication between RMNG and property
owners with adjacent land should be developed. This plan is intended to provide RMNG with a noxious weed management outline for the area of concel1l, in this instance, the SVCS. The
objectives of the plan include: providing basic environmental infonnation about the site, locating and mapping of noxious weed popUlations, outlining and evaluating possible treatment
methods, and establishing preventative measures to minimize noxious weed expansion. This plan will also provide an amendable document for cutTent and future RMNG land managers. 2. Site
Character~ation The SVCS is located in Garfield County, Colorado (SE 1/4 NW 1/4, Section 3, T7S, R88W, 6th PM), refer to Figure I for a visual representation. For a comprehensive description
of the site's environmental selling, please refer to Appendix A -Noxious Weed Survey Report. The soil type consists of the 95 . Showalter·Morval complex, 15 to 25 percent slopes. For
more infonnation on soil type, refer to Appendix A.1 and Figure 2. The SVCS will contain the compressor building, an equipment storage building; emergency backup generator housing and
liquid storage tanks for storage of various SVCS Noxious Weed Management Plan
hydrocarbon liquids associated with the operation of machinery or produced waste as a byproduct of operation, potable water and septic fluids respectively. The potential treatment area
with regards to noxious and undesirable species will include appropriate and applicable right of ways (ROWs) including access roads, topsoil stockpile if applicable, land surrounding
the SVCS that has been disturbed by RMNG activity, and the SVCS facility surface proper. Since the entire location has not been disturbed, future management plans may require that the
treatment area be expanded within the overall site perimeter to encompass all areas of concem. 3. Weeds of Concern To meet the requirements the Colorado Noxious Weed Act (ACT), the operator
shall conduct prescribed management techniques for noxious weeds control and prevention. Species warranting prescribed management control and prevention are included within the Colorado
Noxiolls Weed Lists: List A -designated for statewide eradication; List B -managed to prevent further spread and, for selected species, designated for eradication in large areas; and
List C -of more localized concem, but for which the State will provide education, research, and biological control assistance to jurisdictions that choose to manage the species. The
complete Colorado Noxious Weed List can be found in Appendix B. In addition to the state wide weed list, county weed inspectors develop their own noxious weed lists. The county lists
are comp11sed of noxious weeds from the state list that are more specific to the area of concem. Garfield County has designated twenty (20) of the sixty·eight (6~) species from the Colorado
Noxious Weed List to be likely species fOllnd in the vicinity of their .jurisdiction. Appendix C contains the Garfield County Weed List and descriptions. Species identified during the
June 2013 Noxious Weed Survey, prior to any construction activities are provided below. This survey shall be utilized as the baseline data for management pUllloses. List Classification
Scientific Name Common Name Life Form (A,B,orC) B Ol/opordulII aealifiliulII * Scotch thistle Biennial Forb C Downy brome; BrolllllS feefOJ'llIll Annual Graminoid cheat grass C Verbasellillfhapsus
Common mullein Biennial Forb SVCS Noxious Weed Management Plan
sourcJhas l! should be noted that the noxious weed populations were veI~ small wilh regards to the Scotch this\le and Common mullein. The Downy brome was identified more commonly throughout
the survey area. 4. Weed Inventory Noxious weed surveys were conducted June 2013 on the premises of the SVCS by a third party contractor prior to any construction aclivity associated
with the SVCS. For the full report, please see Appendix A. For a visual representation of the respective survey please refer to Appendix D. The respective appendix will be updated annually
to monitor the spread and or minimization of infestalions. Additional surveys will be conducted annually by qualified individuals to ensure noxious weed treatments and noxious weed populations.
Populations of noxious weed infestations will be mapped by qualified individuals using global posilioning units (GPS) units. The Noxious Weed Inventory Foml, Appendix E, can be used
to provide supplemental survey infonnation if the surveyor deems it appropriate. The surveys will provide a way to identify new noxious weed populations as well as an assessment tool
for previously treated populalions. The inventory is to be updated as the surveys are perfol1ned. There will be an annual review to assess the overall noxious weed populations and success
of treahnents applied. 5. Treatment Methods The treahnent methods and descriptions listed below were obtained from the Mesa County Noxious Weed Management Plan (Mesa County, 2008). Management
techniques include preventative, cuhural, physical/mechanicalmethods, biological and chemical approaches. Optimal noxious weed management methods will vary with the environmental variables
of the area of interest. Soil type and stability, grade, moisture regimes, growing season, pre-existing noxious lVeed populations, land use, water availability, weed type and stage of
growth as well as the intensity of the infestations should all be taken into account when preparing a noxious weed management plaIt The management methods should have minimal impact
on the environment and be economically fi!!ing for the Operator in charge of implementing the noxious weed management program. When assessing weed management on a propeIty, it is important
to evaluate possible modes of transportation for the noxious species. Areas to take into account include; waterways, roads, game trails, areas with livestock and equipment storage sites
to name a few possibilities. The transportation of noxious species is a problem shared by all the stakeholders in the affected area. Good communication should be established between
the affected parties for proper management of the noxious weed populations. Most management plans utilize a combination of the treahnents oullined below. SVCS Noxious Weed Management
Plan
sourcJhas 5.1 Preventative Methods Preventative methods include practices involving good land stewardship, These practices include, but are not limited to; using weed free ce11ified
products, erosion control measures, and regularly cleaning equipment. 5.2 Cultural Methods Cultural methods facilitate competition from desirable plants through actions such as; dense
seeding, irrigation, carefully monitored grazing practices and fe11illzation, 5.3 Physical and Mechanical Methods Physical and mechanical methods include mowing, disking, hand removal,
plowing, buming and solarization, The goal of these methods is predominantly to prevent seed production, Roots should be severed at least two (2) inches below the soils surface for optimal
control. 5.4 Biological Control Methods Biological control methods involve the introduction of living organisms that are deleterious to the noxious weed species, This method is only
applicable for infestations larger than five (5) acres in size, and rarely provides complete control of the noxious species, Frequent monitoring must be carried out with this method,
5.5 Chemical Control Chemical control can offer the most effective means of noxious weed control when applied at the appropriate time, Not all herbicides are equally effective against
all weeds, nor can every herbicide be used in all settings, The respective herbicide applicator should consult with a weed manual before applying any herbicide to the land, 6. Treatment
Recommendations 6.1 Spring Valley Compressor Station Pad Surface It is recommended that the area directly adjacent to structures be treated with a bare ground herbicide, The bare ground
treatment will be applied once a year or as needed to a ten (10) foot SVCS Noxious Weed Management Plan
sourcJbas perimeter around the stlUctures located on the SVCS, All other areas on the SVCS are to be spot treated with an appropriate herbicide, 6,2 ROWs and Land Surrounding the Spring
Valley Compressor Station The respective locations should be treated with a selective herbicide appropriate for the species where the noxious weed is found, The appropriate chemical
to be applied will be detelluined by the licensed herbicide applicator. The specific herbicide applied will vary with the time of year and the stage of growth the plant has obtained
at the proposed treatment date, 6.3 Special Requirements At this point in time there are not any special requirements for the SVCS or the associated ROWs with regards to management of
noxious weeds or other undesirable species, Any and all special requirements will be amended to the document as soon as practicable, 7, Management Strategies 7.1 Prevention Taking preventative
measures to abate the spread of noxious weeds is critical for proper land management. Noxious weeds can become established on or near disturbed land very rapidly and have the capacity,
capability and potential to spread quickly to other areas, Noxious weed seeds and vegetative matter can be transpo11ed by means of animals, vehicles, shoes, and hay to name a few examples
of transportation, Operators should be aware of established noxious weed populations and the possible transport mechanisms on their property and sUll'ounding properties, 7.2 Revegetation
and Rehabilitation After an area has been successfully eradicated of noxious species, or before establishment has taken place, actions to revegetate the disturbed area should be taken
to minimize the chance of noxious weed establishment. If the disturbed land has desired species growing as a result of revegetation eff0l1s, competition with noxious species will be
increased, Therefore, the potential and capability of the noxious weed to establish in the disturbed area is limited, SVCS Noxious Weed Management Plan
sourcJhas Noxious weed management strategies for the SVCS will include a monitoring program, Surveys will be canied out between the months of April and October. Noxious weed populations
will be monitored at this point through qualitative visual intelvretation as well as mapping, 8, Conclusion This noxious weed management plan provides an outline for the treatment and
management of noxious weeds, Please refer to Appendix F for the Noxious Weed Summary Documents which provide contact infonnation as well as general infonnation pertaining to the SVCS,
An annual report will be compiled to assess the overall management program, Noxious weed control is critical to guarantee the environment is preserved for future generations to enjoy
and utilize, Adhering to this management guide will aid RMNG in managing noxious weeds encountered during the time period of involvement at the SVCS, These recommendations are not intended
to be used as a definitive guide for noxious weed management. Herbicide recommendations are available from the Garfield County Weed Department and/or licensed applicators, SVCS Noxious
Weed Management Plan
sourcJbas 9. Amendments Please make nole of any supplemenlallnfonnallon as II becomes available In Ihls secllon. Dale Noles and lnilials SVCS NoxIous Weed Managemenl Plan
10, Noxious Weed Management Resource Guide Garfield County Vegetation Management Steve Anthony P.O. Box 426, 0298 Cr 333A Rifle, CO 81650 Phone: 970.625.860 I Fax: 970.625.8627 Colorado
Weed Management Association Phone: 303.779.7939 hHp:llwww.cwma.org Steve Bennett 2)00 River Frontage Road Slit, CO ~1652 Phone: 970.~76.9000 FAX: 970.~76.9090 Colorado Department of
Agriculture Division of Plant Indushy-Biological Control Section P.O. Box 400 Palisade, CO 81526 Phone: 970.464.7916 Colorado Department of Agriculture Steve Ryder, State Weed Coordinator
Noxious Weed Program Division of Conservation Services 700 Kipling Street, Suite 4000 Lakewood, CO 80215 Phone: 303.239.4173 www.ag.state.co.us/dpilweeds/weed.html SVCS Noxious Weed
Management Plan sourcJbas
11. References Garfield County, 2001. Garfield County Noxious Weed Management Plan, Retrieved from: hllp://www.garfield·county.com/vegetation· management/documents/weed management plan
adopted ,pdf Mesa County, 2008, Mesa County Noxious Weed Management PIal!. Retrieved from: hHp://www.mesacounty.us/pest/pestcontrol/weeds.pdf Weeds of the West, 9th edition, 2006, United
States Department of Agriculture, Natural Resources Conservation Service, 2008, Soil Survey lnfonnation, Retrieved from: http://websoilsurvey,nrcs,usda,gov/appfWebSoiISUll'ey,aspx SVCS
Noxious Weed Management Plan
sourcJbas Figures Figure 1. Overhead Map Figure 2, Soil Map
sourcJbas Figure 1. Overhead Map
Legend 'H.~~l Spring Valley Compressor Station 1:1 Township Site Overview D seclion sourcJbas D Olrseclion N Parcel Line wi E DISClAIMER This Geographic Infonnalion Syslem (GIS) and
ils Author: jharris componeniS are designed as a source of reference 10ranswenll9 Inquir~s, fa ~al'lillJ and for mode~lIJ, GIS is nol inleoded, nor does il 150 300 600 Feet Date: 2/27/2013
rep~e legaldesCli~KJn inforrnalioo inlhe chain of title and olher infonnalioo conl~ned in obi govemmenlrecords sud! as the COlllly I I I I I I I Cle~andRecordersofficeorlhecourts, lnaddilion,
~erepresenlalions oflocalioos ~Ihis GIScanool 00 subsliluledfor acluallegal su~eys
sourc4bas Figure 2, Soil Map
Legend N 'HC~! Figure 2 . NRCS Soils E=:J County Roads wt E III I Proposed Access D Proposed Compressor Site sourcJbas ClTownshiP DISCLAIMER . This Geograph~ Informalioo Syslem (GIS)
and ils Aulhor: jharris componenls are designed as a source of reference lor answenng o inqulies,f l1 plall1iDj and lormodeliDj.G IS is nol inleoded,nordoesil Section 0 150 300 Dale:
6/21/2013 replace legal descripl~n in/ormalion in Ihe cliain of tile and olher I..w..LJ..u.J informaliCClconlained inoblgovernrnenlrecordssuchasllilCounly D OtrSection Cle~andRecordersofficeorlhecour
ts, lnaddilion, Iherepresenlalions Feel cI~lions~lhisGIScannolbesubsliluledforaCluallegal sUIVeys,
sourcJhas Appendix A: Noxious Weed Survey Report
Noxious Weed Survey Spring Valley Compressor Station Garfield Coun~, Colorado prepared for: HRL Compliance Solutions, Inc. 2385 f Y2 Road, Grand Junction, CO 81505 & Wildlife Specialties,
LLC PO Box 1231, Lyons, CO 80540 prepared by: Western Ecological Resource, Inc. 711 Walnut Street, Boulder, CO 80302 June 2013
T able of Contents 1,0 2,0 tnvironmentalSetting ""''''''''''''''''''''''''''',,''''''''''''''''''''''''''''''''''''''''''''''''"'",''''''''''''''''''' 1 3.0 Applicable Laws, Regulations
& Policies,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 4 3.1 State Noxious Weed Law & Policy"""""",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
,,,,,, 4 3,2 Garlield County Weed Policy """",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,4 4,0 Noxious Weed Inventory ''''''''''''''''''''''''''''''''',,''''''
'''''''''''',,'''''''''''''''',' ""'''''''''''''''''''''''' 4 4,1 Methods "''''''',''''''','''''''''''''''',''''''''''''''''''''''''''''''''''''''''''''''''''''""",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,4
4,2 Resu Its"", '"'' '" '" "'''''''''''''' "" '''''''''''''''' "',,"'" "" '" "" '''''' '" ,'" '"''',''' "", '" '''' ," """ ",""" 4 Appendix A, List of Noxious Weed Species designated
by the State of Colorado",,,,,,,,,,,,,,,,,,,,,,, 9 Appendix B, Garfield County Designated Noxious Weeds""",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 11
List of Figures Number I Title ~igure 1. figure 2, Aerial IIVIV IVla~""" .. """" .... "", .. ",,,,,,, .. ,,,,,, .... ,,,,,,,,, .... ,,,,,,, .... ,,,,,,, ..... ,"'" .... ,""''''''''''
rigure 3. Noxious Weed Result Map ... """ .. """" .... "" ..... """'" .. """'" .. """" ..... "",, ... ,,',,,,,,,,,,,,8 List of Tables Number I Title Table 1. Noxious Weed Species Observed
at Spring Valley Compressor Station, "" .. """" .. ,, ...... ,5 Table 2. Vascular Plant Species Observed at Spring Valley Compressor 5tation"" ... """ ... """"",,5
1,0 Introduction This report provides descriptions and locations of Garfield County listed noxious weeds for the Spring Valley Compressor Station (SVCS) and fu\tills the inventory requirements
of Article 7: Standards of the Gartield County Unified Land Use Resolution ot 2008, as amended. Specilically, the SVCS is located approximately 7,9 miles southeast of downtown Glenwood
Springs, Colorado in the SW~ of the Nt Y4 Ot Section 3 in lownship 7 South and Range 88 West, 6th Principal Meridian (Figure 1), The proposed SVCS site includes a 4,8 acre compressor
station site as well as a 4,400 foot long access road (figure 2), 2,0 Environmental Setting The proposed SVCS site is east ot the south end 01 Spring Valley and slopes and drains to
the southwest lhe site ranges in elevation trom a high of 7,260 leet to a low Ot 7,160 feet and is bordered by irrigated pastureland to the west and native vegetation communities to
the north, east and south, An aboveground electric transmission line and underground gas lines cross the northwest corner 0\ the parcel and an irrigation ditch bisects the west portion
of the parcel, U.s, Bureau of Land Management (BLM) lands border the site on the east. Vegetation at the proposed SVSC location and entrance road is dominated by a mosaic of Gambel oak
(Quercus gambelil) woodlands and sagebrush shrub lands (Artemisia tridentatm, In addition, there is a small amount 0\ irrigated pastureland and disturbed vegetation types, The proposed
road location is dominated by Gambel oak woodlands, which support a diverse shrub layer 01 serviceberry (Amelanchier alnifolia), sagebrush, snowberry (Symphoricarpos rolundifolius),
and bitterbrush (Purshia triden/atm. Common herbaceous species include native graminoids such as elk sedge (Carex geyen), junegrass (Koeleria macrantha) and Canada bluegrass (Poa compressa),
as well as a diversity of native forbs such as silvery lupine (Lupinus argenleus), mariposa lily lealochortus gunnisonil), lambstongue groundsel inlegerrimus), Rocky Mountain penslemon
(Penstemon strictus), balsamroot (Balsamorhiza sagittata), and narrowleaf mountain trumpet (Collomia lineari5), The sagebrush shrub lands, which dominate the proposed SVCS site, contain
a moderately dense occurrence o! sagebrush along with scattered Gambel oak, lhe understory is comprised 01 a diverse suite oi native herbaceous plants common to the region, including
the native graminoids needle-and-thread grass (Hesperostipa comata), junegrass, Indian r\cegrass (Oryzopsis hymenoides), and western wheatgrass (Paseopyrum smithil), Cheatgrass IAnisantha
tee/orum syn, Bromus leetorum), a Colorado listed noxious weed, is also common in the sagebrush understory, Other associates include two cacti, brittle pricklypear (Opuntia ~agihs) and
Simpson hedgehog cactus (Pediocactus simpsonii); as well as numerous forbs such as Osterhout's penslemon (Penstemon osterhoutill, tapertip onion (Allium acuminatum), comandra (Comandra
umbellala), roughseed cryptantha (Qreocarya flavocula/a), Long's phlox (Phlox longifolia), coppermallow (Sphaeralcea coccinea), scarlet gilia (/pomopsis aggregata), and taperlip hawksbeard
(Psilochenia acuminala), A small portion of the western end ot the sagebrush shrubland has been converted into agricultural pastureland dominated by smooth brome, finally, the disturbed
underground pipeline corridor, which crosses the northwest corner of the site, is dominated by western wheatgrass and bluebunch wheatgrass (Pseudoroegneria spicata), which were likely
seeded, along with several native colonizing plants such as needle-and-thread grass, Indian ricegrass, Osterhout's penstemon, salsify (Tragopogon dubius), wild flax (Adenolinum leWisii),
and Tracy's thistle (Cirsium tracYI), Overall, vegetative cover is good and no erosion is occurring,
107'20'O"W 107'19'a'W 107'18'O"W 107'17'O"W 107'16'O"W 107'WO"W 107'14'O"W 107'13'O''W I07'12'O"W I07'II'O"W Grid LaULong WGS 1984 COLORADO N + Scale 1 :96,000 1 inch: 8,000 feel 2 Figure
1. Vicinily Map Spring Valley Compressor Slalion Gartield Counly, Colorado WeSlero fcological Resource Inc. 711 Walnut Street I Boulder, CO 80302 303-449-9009
BASE: ESRI1 meter resolution Aerial Photography N + Scale 1:24,000 1 inch: 2,000 feet COLORADO 3 Figure 2, Aerial Photo Map Spring Valley Compressor Station Gartield County, Colorado
WeslernEcological RelOurce lnc. 711 Waillul51reel I Boulder, CO 80J02 JOJ·449·9009
3.0 Applicable Laws, Regulations & Policies 3.1 State Noxious Weed law & Policy Under t~e Colorado Weed Management Act, 99 35·),5·101 C,R,S, (Colorado Weed Act), t~e Itate of Colorado
nas oificially designated 82 plant Ipecies as noxious, wnicn are divided into tllree lilts. Colorado State list A species are noxious weeds tnat are not common to the state and require
eradication, Upon identification of a list A species, tne State Weed CoordinatorlCounty Weed Control Supervisor is to be notified to coordinate control eliorts. list B species are noxious
weeds for wnich tne state is currently developing management plans but does not require treatment for at tnis time, list C species are weed species commonly found througnout tne state,
While the state does not require treatment lor species included on its lists Band C, control 01 these species may be required at the county Current inlormation on tne State of Colorado
Weed Management Program and species lists can be obtained at: nltp:!!www.ag.state.co.us! DPI!weedslWeed,html, Appendix A contains a list of Colorado noxious and watch listed plant species
at the time of report preparation, The Colorado Weed Act states that noxious weed management is the responlibility of eaclllocal governing agency· incorporated municipalities, counties,
and lands owned by state and federal agencies, Tne Act states tnat tne Board 01 County Commissioners of each county in tne state snail adopt a Noxious Weed Management Plan lor all 01
the unincorporated lands witnin tne county, Tne following lection describes tne weed management plans adopted by Garfield County, 3.2 Gartield Coun~ Weed Policy Tne Garlield County NoxioUI
Weed Management Plan was adopted by tne Board of County Commislioners on May 1, 2000, Tne plan also contains Revegetation Guidelines and Reclamation Standards as amended May 7, 2001,
Tne Garneld County Plan requires eradication of all list A species, as mandated by tne Itate, and containment and suppression measures lor 16 01 the list Bs peciel and tnree of the List
CIp ecies identified in Garfield County. Overall, the County has adopted an "early detection, early treatment" philosopllY, farly detection refers to identi~ing and documenting weed
Ipecies recently introduced into an area, early treatment is tne follow·up that could possibly eradicate new infestations, Garfield County1s Noxious Weed Plan can be accessed at http://www.garlield-c
ounty.com!vegetation·managemenUdocuments! weed _ management}lan _adopted _,pdf 4.0 Noxious Weed Inventory 4,1 Methods A site·specific inventory of noxious weeds was completed on June
14, 2013 by Rea Ortnner 01 Western ecological Resource, Inc. Tile survey was conducted by carefully walKing the nabitats of the project site and lOOKing for noxious weed species, Both
tne 4,400 foot long proposed road and the 4.8 acre proposed SVCS site were surveyed, A lilt of all vascular plant species observed on the site was also compiled (Table 2), 4,2 Results
The project area is relatively weed free and only three Colorado noxious weed species were found during the onsite lield reconnaissance, Table 1 lists the noxious weeds observed at SVCS
and their classification according to tne Weed Act. No list A Species, whicn require eradication by the State, were lound, However, one list B and two lilt C species were observed, Bot~
tne Scotch thistle (Onopardum acanthium) and common mullein Werbascum thapsus) occur at the eastern end of tne existing pipeline corridor (Figure 3), Only one rosette or eacn plant was
found, Cheatgrass (Bromus leetarum), however, was found extensively along tne existing road, t~e irrigation diten, within tne disturbed pipeline corridor, and witnin tne lagebrush snrubland
naoitat of tne proposed SVCS, The abundance or cneatgrals is fairly typical of habitats within tne area, Only the Scotch thistle is on the Garfield County Noxious Weed list. Otner non-native
weeds include false flax (Came/ina microearpa), pric~ly lettuce ([aeluea serrio/a), tumble mustard (Sisymbrium a/flssimum), pennycress (Th/aspi and salsify (Tragopogon dubius), None
01 these plants, however, are state or county listed noxious weeds,
l/";::\""/'.':.iJ'·ISlld~:;;k\'j': . ,", I.~IJI~J; '1\~1.i~lal< ,';';' I~~;~} ::;.' ,,!{,;. '. :i:':'i'!':::;'::"'(I~ff!1 ' 'iJ,:!;.\I:;,,:, I~;:'F j)::.,~ :" :. c""':: .:i';:::'/:,:'"
....... , ;.,i:, )i~c\'.: ~ Scientific Name Common Name Family Origin* Perennial Forbs Achillea lanlllosa Yarrow Asteraceae N Adenolinum lewisii (Unum) Wild flax linaceae N Agosefls
glauca Pale agoseris Asteraceae N Allium acuminatum Tapertip onion Alliaceae N Antk:lea elegans Death camas Melanthiaceae N Astragalus fiexuosus Flexile milKvetch fabaceae N Balsamorhiza
sagittata Balsamroot Asteraceae N Calochortus gunnisonii Mariposa lil~ Calochortaceae N Castilleja chromosa Indian paintbrush ~cropulariaceae N Chaenactis douglasii Douglas pinclIsllion
Asteraceae N Cirsium tracyi Tracis thistle Asteraceae N Comandra umbellala subsp. pallida Comandra Santalaceae N Erigeron diver gens Spreading Ileabane Asteraceae N Eriogonum umbel/alum
Wild bUCKwheat Polygonaceae N Erysimum capitalum Western walillower Brassicaceae N Fragaria virglnlana subsp, glauca Mountain strawberry Rosaceae N ipomopsis aggregala ~carlet gilia
Polemon iaceae N lomatium trilematum Ternate desert parsley Apiaceae N subsp,platycarpum [upinus argenteus Silvery Ilpine fabaceae N Medicago saliva AIIalla Fabaceae I Oreocao!a flavow/ala
Rougnseed cryptantna Boraginaceae N Packera multilobata lobe·leaf groundsel Asteraceae N Penslemon osterhoutii Osterhout's penstemon ~cropulariaceae N Penslemon strieills ROCKY Mountain
penstemon Scrophulariaceae N Phlox 100lgifolia long's phlox Polemoniaceae N Psiloehenia acuminata T apertip hawKs beard Asteraceae N Senecio integerrimus lambstongue groundsel Asleraceae
N Sphaera/cea coccinea Coppermallow Malvaceae N Taraxacum officinale Dandelion Asteraceae I Trifolium repens White Dutch clover Fabaceae I Cacti Opunlia fragills Brittle priCKly pear
Cactaceae N Pedioeac/us simpsonii ~i01pson hedgehog cactus Cactaceae N Annual/Biennial Forbs Camelina microcarpa false II ax Brassicaceae I Collinsia parviflora BI ue·eyed Mary ~crophulariaceae
N Co/lomia Iinearis Narrowleaf Polemon iaceae N mountaintrumpet Hacke/la florlbunda Many/lower stickseed Boraginaceae N lacluea serriola PriCKly lettuce Asteraceae I Melilolus officinalis
Yellow sweet clover fabaceae I OnoporduJ1J acanlhlum ~cotch thistle Asteraceae I+b Sisymbrium altissimum T umble mustard Brassicaceae I Waspi arvense Pennycress Brassicaceae I TragopogoJ)
dubius Salsily Asteraceae I Verbascum thapsus Common mullein Scropnulariaceae I+c
Scientific Name Common Name Family Origin* Annual Graminoids Anisantha teclorum (Bromus) Cheatgrass; Downy brome Poaceae Itc *Origin = N -Native, I-Introduced, It-Colorado listed Noxious
Weed and Class
309800 309900 310000 310100 310200 310300 310400 310500 310600 310700 310800 309800 309900 310000 310100 310200 310300 310400 310500 310600 310700 310800 BASE: ESRI Aerial Imagery .
Grid: UTM NAD83 Z13 N Legend + * Noxious Weeds o Proposed Road o Proposed SVCS Site Scale 1:6 ,000 1in ch: 500 feel Nol shown: Chealgrass • found Ihroughoul 8 Figure 3. Noxious Weed
Result Map Spring Valley Compressor Slalion Gartield Counly, Colorado Wellern[cological Resource Inc. 711wainUISIreei l Boulder,CO 80302 303-449·9009
Appendix A, list of Noxious Weed Species designated by the State of Colorado List Asp ecies in Colorado that are designated by the Commissioner lor eradication: Alrican rue (Peganum
harmala) Camelthorn (Alhagi pseudalhagt) Common crupina (Crupina vulgaris) Cypress spurge (Euphorbia cyparissias) Dyer' 5 woad (/satis tinctorial Giant salvinia (Salvinia molesla) Hydrilla
(Hydrilia verticillata) Meadow knapweed (Centaurea pratensi~ Mediterranean sage (Salvia aethiapis) Medusahead (Taeniatherum caput-medusae) Myrtle spurge (Euphorbia myrsinites) Orange
hawkweed (Hieracium aurantiacum) Purple loosestri!e ([ythrum salicaria) Rush skeletonweed (Chondrilla juncea) Sericea \espedeza (Lespedeza cuneala) Squarrose knapweed (Centaurea virgata)
Tansy ragwort (Senecio jacobaea) Yellow starthistle (Centaurea solstitialis) LIst B weed species are species lor which the Commissioner, in consultation with the state noxious weed advisory
committee, local governments, and other interested parties, develops and implements state noxious weed management plans designed to stop the continued spread 01 these species: Absinth
wormwood (Artemisia absinthium) Black henbane (Hyoscyamus mgen Bouncingbet (Saponaria officinali~ Bull thistle (Cirsium vulgare) Canada thistle (Cirsium arvens~ Chinese clematis (Clematis
orientalis) Common tansy (Tanacetum vulgare) Common teasel (Dipsacus (ul/onum) Corn chamomile (Anthemis arvensis) Cutlea! teasel (Dipsacus lacinialus) Dalmatian toadtlax, broad-leaved
(Linaria dalmatica) Dalmatian toadHax/narrow·leaved (Linaria genistifoiial Dame's rocket (Hesperis matronali~ DiHuse knapweed (Centaurea diffusa) Eurasian watermil!oil (Myriophyllum
spicatum) Hoary cress (Cardaria draba) Houndstongue (Cynogiasslim officinale) Lea~ spurge (Euphorbia esula) Mayweed chamomlle (Anthemis cOlula) Moth mullein (Verhascum blallaria) Musk
thistle (Carduus nufans) Oxeye daisy (Chrysanthemum leucanthemum) Perennial pepperweed (tepidium latifolium) Plumeless thistle (Carduu5 acanthaides) Quackgrass (Elytrigia repens) Redstem
!\\aree (Erodium cicutarium) Russian knapweed (Acroptilon repell~
Russian-olive (Elaeagl1115 angustiiolial Salt cedar (Tamarix chinensis, T.parviflora, and T. ramos/55ima) Scentless chamomile (Matricaria perforatal Scotch thistle (Onopordum acanthiuml
Scotch thistle (Onopordum tauricum) Spotted knapweed (Cenfaurea maculosal Spurred anoda (Anoda crislala) Sul\ur cinquetoil (Potentilla rectal Venice mallow (Hibiscus Irionum) Wild caraway
(Carum carvn Yellow nutsedge \Cyperus esculentu5\ Yellow toadtlax (Linaria list C weed species are species for which the Commissioner, in consultation with the state noxious weed advisory
committee, local governments, and other interested parties! will develop and implement state noxious weed management plans designed to support the efforts of local governing bodies to
facilitate more eliective integrated weed management on private and public lands. The goal 01 such plans will not be to stop the continued spread of these species but to provide additional
education, research, and biological control resources to jurisdictions that choose to require management 01 list C species: Chicory (Cichorium il1tybuQ Common burdock (Arctium minus)
Common mullein (Verbascum thapsus) Common St.!onnswort (Hypericum perforatum\ Downy brome (Bromlls teetarum) field bindweed (Convolvulus arvensis) Halogeton \Halogeton glomeratus) lohnsongrass
\Sorghum ha/epens&i jointed goatgrass (Aegi/ops cylindrica) Perennial sowthistle (Sonchu5 arvensis) Poison hemlock (Conium maculaluml Puncturevine (Tribulus ferrestris) Velvetleat (Abutilon
theophrastl\ Wild proso millet (Panicum miliaceum\ 10
Appendix Bo Garfield Coun~ Designated Noxious Weeds . Common name -Scienlilic name -List Leaty spurge -Euphorbia esu/a· List B Russian knapweed • Acroptilol1 repens· List B Yellow starthistle
-Cenlaurea 50lstitalis· List A Plumeless thistle . Carduus acanthaides· List B Houndstongue . Cynogl055um officinale-List B (ommon burdock -Arc/ium minus -List C Scotch thistle· Onopordum
acanthium -List B Canada thistle • Cirsium arvense -List B Spotted knapweed • Centaurea maculosa -List B Diffuse knapweed -Centaurea diffusa -List B Dalmatian toadtlax -Linaria dalmatica
-List B Yellow toadllax -linaria vulgaris-List B Hoary cress • Cardaria draba· List B Saltcedar • Tamarix parvlflora· List B Saltcedar • Tamarix ramosi55lma· List B Oxeye Daisy . Chrysanthemum
!eucantheum -list B Jointed Goatgrass· Aegi/ops cylindrica· List ( Chicory. Cichorum intybus-List C Musk thistle • Carduus nutans -List B Purple loosestrile· iythrum sallcarla-List A
Russian olive -flaeagnus angustifo!ia -List B 11
sourcJhas Appendix A.l: National Resollrce Conservation Service (NRCS) Soil Descriptions
Map Unil Descriplion: Showaller·Morval complex, 1510 25 percenl slopesAspen·Gypsum Area, Colorado, Parts of Eagle, Garfield, and Pilkin Counlies Appendix A.!: SVCS Soil Descriplion Aspen·Gypsum
Area, Colorado, Parts of Eagle, Garfield, and Pitkin Counties 95-Showalter·Morval complex, 15 to 25 percent slopes Map Unit Setting Elevation: 7,000 to 8,500 fee! Mean annual precipitation:
14 !o 16 inches Mean annual airlemperalure: 42 to 44 de~ree$ F Frost·free period: 80 10 90 days Map UnH Composition Showaller and similar soils: 45 percent Morval and similar soils:
35 percent Description of Showalter I Natural Resources Conservation Service Setting Landform: Alluvial fans, terraces, valley sides Landform position (three-dimensional): Trea~ Down-slope
shape: Linear Across-slope shape: Linear Parenl material: Alluvium derived from basalt Properties and qualities Slope: 15 to 25 percent Deplh 10 reslriclive fealure: More than 80 inches
Drainage class: Well drained Capacily of Ihe mosllimiting layer 10 transmit water (Ksal): Moderately low to moderately high (0,06 to 0,20 inlhr) Depth 10 water table: More than 80 inches
Frequency of flooding: None Frequency of ponding: None Calcium carbonale, maximum conlenl: 10 percent Available waler capacily: Low (abou! 5,5 inc~es) Interpretive groups Farmland classification:
Not prime farmland Land capability (nonirrigated): 7s Hydrologic Soil Group: C Ecological sile: Loamy Slopes (R048AY303CO) Olhervegelative classification: LOAMY SLOPES (null)1) Typical
profile 0108 inches: Ve~ stony loam 81039 inches: Ve~ cobbly clay 391060 inches: Ve~ cobbly clay loam Description of Morval Setting Landform: Alluvial fans Down-slope shape: Linear Web
Soil Survey Nalional Cooperalive Soil Survey 6/19/2013 Page 1012
Map Unit Description: Showalter·Morval complex, 15 to 25 percent slopesAspen·Gypsum Area, Colorado, Parts of Eagle, Garfield, and Pitkin Counties Appendix A 1: SVCS Soil Description
Across·slope shape: Linear Parent malerial: Alluvium derived from basalt Properties and qualities Slope: 15 to 25 percent Deplh to restrictive feature: More than 80 inches Drainage class:
Well drained Capacity of the most limiting layer /0 transmil water IKsal): Moderately high (0,20 to 0,60 in/hr) Deplh 10 water lable: More than 80 inches Frequency of flooding: None
Frequency of ponding: None Calcium cariJonale, maximum con/enl: 25 percent Maximum salinity: Nonsaline to ve~ slightly saline (0,0 to 4,0 mmhosl em) Available water capacity: High (about
9,3 inches) Interpretive groups Farmland classificalion: No! prime farmland Land capabili/y (nonirriga/ed): 6e Hydrologic Soil Group: B Ecological sile: Deep Loam (R048AY292CO) Other
vege/alive classificalion: DEEP LOAM (nuIL11) Typical profile o1 0 7in ches: Loam 710 19 inches: Clay loam 19 to 60 inches: Loam Data Source Information Soil Survey Area: Aspen·Gypsum
Area, Colorado, Parts of Eagle, Garfield, and PitKin Counties Survey Area Data: Version 5, Jun 9, 2008 I Natural Resources Conservation Service Web Soil Surve~ National Cooperative Soil
Survey 6/19/2013 Pa~e2 012
sourcJbas Appendix B: Colorado Noxiolls Weed List
sourcJhas Colorado Noxious Weed List List A Noxious Weed Species In accordance with the revised Colorado Noxious Weed Act, 35-5.5-101-119 rev. 2003, which recategorized the State noxious
weed list into three lists, all populations of List A species in Colorado are designated by the Commissioner for eradication. African me PeRG111llJliwllwia Camelthom Aliwgi pseudaliwgi
Common cmpina Crupilla vldgaris Cypress spurge Eupharbia cyparissias Oyer's woad lsatis tillctaria Giant salvinia Salvillia molesta Hydrilla H Idrilla verticiliata Meadow knapweed Centaurea
pm tells is Meditenanean sage Salvia aethaiapis Medusahead Taelliatherum caput-medusae Myrtle spurge Euphorbia myrsillites Orange hawkweed Hiemcium auralltiaclllII Pufjlle loosestrife
Lvthl'lllll salicaria Rush Skeletol\weed Cholldril/a jl/llcea Sericea lespedeza Lespedeza CI/lleata Squarrose knapweed Cell tal/rea virRata Tansy ragwort Sellecio iacobaea Yellow st3lihistle
Celltal/rea solstitialis
sourcJhas List B Noxious Weed Species List B noxious weeds are species for which the Commissioner, in consul\ation with the state noxious weed advisory commiHee, local govemments, and
other interested parties, develop and implements state noxious weed management plans designed to stop the conlinued spread of these species, Absinth wonnwood Artemisia absillthillm Black
henbane Hyoscyamlls lIiger Bouncingbet Sapollaria officillalis Bull thistle Cirsillm viligare Canada thistle Cirsillm QlWlIse Chinese clematis Clel1latis orielltalis Common tansy Tallacetllm
vlllRare Common teasel Dipsaclls {ttIlolillm Com chamomile AlithemisQlwlIsis Cutleaf teasel Dipsacils lacilliatlls Dalmatian toadflax, broadleaved Lillaria dalmatica Dalmatian toadflax,
nal1'0w·leaved Lillaria genistifolia Dame's rocket Hesppis Illatrolialis Diffuse knapweed Celltallrea dim/sa Eurasian watennilfoil Myriophylilim spicatllm Hoary cress CaNlaria draba
Houndstongue C)illOglosSlll1l officinale Leafy spurge Ellphorbia eSllla Mayweed chamomile Allthel1lis cotilia Moth mullein VerbasclIIlI blal/aria Musk thistle Cardllils /1li/aIiS Oxeye
daisy CllIysalithemllllllellcalithelllllm Perennial pepperweed Lepidiwlllatifoliul1I Plumeless thistle CllrdllllS acnathoides Quackgrass Elytrigia repells Redstem filaree Erodilll1l
cicutarilllil Russian knapweed Acroptilollrepells Russian olive Elaeaglills allgllstifolia Salt cedar* Tamarix chillellsis, T. pan'ifiora, alld T. 1'11l1Iosissima Scentless chamomile
Matricaria perforate Scotch thistle Oliopordlll1l acalithillln, 0. tallricllm Sp_otted knapweed Celltallrea maclilosa Spul1'ed anoda Alwda cristata Sulfur cinquefoil Potelltilla recta
Venice mallow Hibisclls triolllllil Wild caraway Cal'l/11I carvi Yellow nutsedge CJPel'lls escllielltils Yellow toad flax Lillaria viligaris * Tamarisk is a noxiolls weed "preferred
to be controlled" rather than mandatory
List C Noxious Weed Species List C noxious weeds are species for which the Commissioner will develop and implement state noxious weed management plans designed to support the efforts
of local goveming bodies to facilitate more effective integrated weed management on private and public lands. The goal of such plans will not be to stop the continued spread of these
species but to provide additional education research, and biological control resources to jUlisdictions that choose to require management of List C species. Source: From the Department
of Agriculture, Plant lndushy Division, 8 CCR 1203·19, Rules Pel1aining to the Administration and Enforcement of the Colorado Noxious Weed Act. Chicory Cihol'lllll illtyblls Common burdock
ArctillllllllillllS Common mullein Verbasclllll thapsils Common St. JohnswO\1 H)periclIlll perrowtlllll Downy brome Brollllls tectonI/II Field bindweed COllvolvlIllIS GlWlIsis Halogeton
Halo~etoll ~lollleratlls Johnsongrass SO/gilullI ilalepellse Jointed goat grass Ae~ilops cylilldrical Perennial sowthistle SOllchllS GlWlIsis Poison hemlock COlliullIllIaculatll1ll Puncturevine
Tribillus terrestris Velvetleaf Abutiloll theopilrasti Wild proso millet PalliclIlIlllliliacelllll
sourcJbas Appendix C: Garfield County Noxious Weed List, taken from the Garfield County Noxious Weed Management Guide, 2002
sourcJbas 1 Leafy Spurge 1 EI/pilorbia eSl/la 1 Russian Knapweed I'A-C-,-·O-p-I'-' -O-Il-,-·e-p-e-Ils----------Ivcllow Stal1histle 1 Celllal/rea solslila/is Plumeless Thistle 1 Cardl/I/s
acallliloides 1 Houndstongue -~~ I CYlloglosSlI1II offlc illak --~;;;~ ~~k fh~lil/lII lIIillllS -----1 Scotch Thistle 1 Ollopordl/III acalllilil/l11 1 Canada Thistle p rsilllll arvellse
_______ . _ 1 ~~K;,~~ed I Celllal/rea lIIacl/l-;;;a 1 Diffuse Knapweed 1 Celllal/rea diffi,sa r--------------------------1 Dalmatian 1 Toadflax Linaria dallllalica rl Y-e-II-o-w-T-o-a-d-n-a-x-I
Lillaria vl/Igaris 1 Hoary Cress 'I C-c-II-·d-a-r-ia-d,-·c-,b-a-----------1 Salt Cedar 1 Talllarix parviflora, Talllarix ralllosissillla I'O-x-ey-e-D-a-i-sy---I Cill ),salllilellllllll
lel/Calllilel/111 rl J-O-il-lt-e-d-O-o-a-t-gl-·a-s-s-I Aegilops cylindrica 1 ChicOlY 1 Ciciloril/III illtybl/s IrM-u-s-k-T-I-li-s-tl-e---1 Ca rdl/I/s III/fa liS 1 Purple Loosestri fe
IrL-y-l-il-n-II-Il-s-c-tf-ic-C-II-·h-'---------·-1 Russian Olive 1 Elaeaglll/s allgl/sli(olia
sourcJbas Appendix D: Annual Weed Survey Maps 0-\ 2013 Map
sourcJbas Appendix E Noxiolls 'Veed Inventory Form
sourcJbas Noxious Weed Inventory Form I Date Surveyors I Location --I Name of Way point La!: Long: Growth Stage Sensitive? New Site? Notes
sourcJbas Appendix F Noxious '''ced Summary Documents
Noxious '''eed Summary Documents Date: May 2013 Project Name: Spring Valley Compressor Station Permittee Name: Rocky Mountain Natural Gas LLC Permittee Corporate Address: Rocky Mountain
Natu ral Gas LLC 825 21 Y, Road Grand Junction, CO 81505 Permittee Contact: Jay Fowler Permittee Contact Phone Number(s): (970) 928-0409 -Field Contact Permittee Contact email address:
Jay.Fowler@sourcegas.com Property Owner: Jeff and Britton Nieslanik, and J&S Nieslan ik LLLP County Assessor's Parcel No.: 2187-344-00-159, and 2393-032-00-032 Address/Location of Propert)':
sourcJbas Property Owner email address (optional): Section 34, T6S, R88W and Sections 3 and 4, T7S. R88W Name & Address ofQualifiecllnclividual or Company Submitting Weed Plan: HRL Compliance
Solutions, Inc. 2385 F Y, Road, Grand Junction, CO 81505 Kate Ramsay Phone Number(s): 970.243.3271 Email : kramsay@hrlcomp.com Authorized Signature: _ _ ___ _ _____ ______ _ Print Authorized
Name: ________________ _ Land Usc Objectives: Gas and Oil Exploration o All noxious weeds, as defined in the Garfield County or List A and Li st B species slated for eradication or suppression
in Garfi eld County by State Law (CRS 35 -5 .5), will be managed in all disturbed areas of the proposed project using recommendations in Garfield Count y or other biologicallybased recommendations.
o All State List A and List B populations to be eradicated and any other species slated by the County for eradication will be reported immediately upon discovery to the County Weed and
Pest Inspector. o The applicant/pennittee and their designees agree to respond to landowner complaints about noxious weeds during development of the project site and take action to control
such weeds when there is a complaint. Where do the weed(s) occur (check all that apply)?
sourcJhas o Ditch, waterway, roadside or corral 0 Rangeland o Irrigated 0 Non-ilTigated pasture 0 Pipeline ~ SVCS pad/perimeter ~ Easement, utility cOlTidor or other right-of-way o Well
pad, compressor/pump station, etc. ~ Access road o Other (describe): Proposed methodes) of management (check all that apply): ~ Herbicide 0 Cultural ~ Revegetation o Mechanical 0 Preventive
0 Biological o Altemati ve (describe): __ ~ We plan to use the services of a professional weed control company. Company name: Native Habitat Spray application records will be retained
by and be available for inspection from: Kurt Grimm, (970) 948-9894 Preventative Measures to be used during the active phase of development a) 0 Track pad 0 gravel bed or 0 rumble ships
will be installed at ingress/egress points. b) Certified Weed-Free 00 mulch 00 erosion control 0 seed will be used to prevent new weed infestations (check all that apply). c) 0 Vehicles
and equipment entering the project site will be clean of mud and weed parts. d) Soil from infested areas of the project site ~ will not be moved off site. o will be moved off site to:
(indicate site location) o Soil moved off site will be treated to control weeds at the new site. ~ Soil stockpiled on site and left in place for 90 days or more will be treated to control
weeds. ~ Soil stockpiled on site and left in place for one year or more will be planted with to prevent weeds from establishing. e) ~ Noxious weed infestations on specified access rond(s)
to the project site will be treated. Exceptions: f) 0 Weeds in adjacent properties will be mapped. g) 0 Weeds in adjacent properties will be treated with permission of landowner. h)
DOther:_ Monitoring Who wi ll monitor the weed treatments? HRL Compliance Solutions, Inc or another qualified entity/person Monitoring will be done at least I time(s) per year in the
summer (enter approximate time(s) of year). Monitoring will be done for -Dmonths 0 years 0 until site is deemed restored. Mapping ~ A map of the propelty showing the GPS locations of
weed infestation(s) is attached. (infestations adjacent to or crossing borders of the property should be included.) ~Mapping will be conducted I times per year until area is deemed restored
complete ~ A revegetation plan is included as a separate document.
GEOLOGIC AND GEOTECHNICAL INVESTIGATION SOURCE GAS SPRING VALLEY COMPRESSOR STATION GARFIELD COUNTY, COLORADO Prepared For: HRL COMPLIANCE SOLUTIONS, INC. 744 Horizon Court #140 Grand
Junction, CO 81506 Attention: Ms. Ashlee Lane Project No. GS05724-115 234 Cenler Drive I Glenwood Springs. Colorado 81601 Telephone: 970·945·2809 Fax: 970·945·7411 March 19, 2013
TABLE OF CONTENTS SCOPE ........................................................................................................................................... 1 SUMMARY OF CONCLUSiONS
..................................................................................................... 1 SITE DESCRIPTION ..............................................................................
......................................... 2 PROPOSED CONSTRUCTION ...................................................................................................... 2 SITE GEOLOGY
AND GEOLOGIC HAZARDS .............................................................................. 2 FIELD AND LABORATORY INVESTIGATIONS .............................................................
............... 6 SUBSURFACE CONDITIONS ........................................................................................................ 6 Natural ClaylClay-SiIt .............................
.................................................................................... 7 EARTHWORK RECOMMENDATIONS ......................................................................................
.... 7 Site Grading ............................................................................................................................... 7 Sub-Excavation and Structural Fill
........................................................................................... 8 Imported Fill ...........................................................................................
.................................... 9 Utility Construction .................................................................................................................... 9 FOUNDATIONS
............................................................................................................................. 10 Mat Foundations ......................................................
................................................................ 11 FLOOR SYSTEM AND SLABS-ON-GRADE ................................................................................ 12
BELOW-GRADE CONSTRUCTION ............................................................................................. 12 SUBSURFACE DRAINAGE .........................................................
................................................. 13 SURFACE DRAINAGE .............................................................................................................•....
13 General Design Considerations .............................................................................................. 14 CONCRETE ...........................................................
....................................................................... 15 GRAVEL ACCESS ROAD .........................................................................................................
.... 15 FINAL DESIGN CONSULTATION AND CONSTRUCTION OBSERVATIONS ........................... 16 GEOTECHNICAL RiSK ......................................................................................
........................... 17 LIMITATIONS ............................................................................................................................... 17 FIGURE 1
-VICINITY MAP FIGURE 2 -LOCATIONS OF EXPLORATORY AND SUBGRADE BORINGS (OVERALL) FIGURE 3 -LOCATIONS OF EXPLORATORY BORINGS (COMPRESSOR STATION) FIGURES 4 AND 5 -SUMMARY LOGS OF EXPLORATORY
BORINGS FIGURE 6 -EXTERIOR FOUNDATION WALL DRAIN APPENDIX A-LABORATORY TEST RESULTS APPENDIX B -GUIDELINE SITE GRADING SPECIFICATIONS HRL COMPLIANCE SOLUTIONS. INC. SOURCE GAS SPRING
VALLEY COMPRESSOR STATION PROJECT NO. GS05724-115 5:\G505724.000\115'12, AepClrls\GS05724 115 A1.doc
SCOPE This report presents the results of our Geologic and Geotechnical Investigation for the Source Gas Spring Valley Compressor Station in Garfield County, Colorado. The purpose of
our investigation was to identify geologic hazards that may exist at the site and evaluate the subsurface conditions. This report includes descriptions of site geology, our analysis
of the impact of geologic conditions on site development, a description of the subsurface conditions found in our exploratory borings, results of laboratory testing and recommendations
for foundations, floors, below-grade walls and road construction. This report was prepared for the exclusive use of HRL Compliance Solutions, Inc. and the design team based upon our
understanding of the project. A summary of our findings and recommendations is presented below. More detailed discussions of the data, analysis and recommendations are presented in the
report. SUMMARY OF CONCLUSIONS 1. No geologic or geotechnical conditions were identified which would preclude the planned construction at this site. Collapse-prone and swelling soils
are the primary geologic concerns. 2. The soils found in our exploratory borings generally consisted of sandy clay "topsoil" and sandy clay/clay-silt with occasional basalt cobbles to
the maximum explored depth of 30 feet below the existing ground surface. 3. We did not encounter ground water in our borings during drilling or when checked 2 weeks later. 4. Mat foundations
are appropriate for buildings constructed at the site. Criteria for the design of mat foundations is provided. 5. COOT Class 6 aggregate base course is suitable for the surfacing of
access roads. Details are presented in this report. HRL COMPLIANCE SOLUTIONS, INC, SOURCE GAS SPRING VALLEY COMPRESSOR STATION PROJECT NO. GS05724·115 S:\GSOS724.000\11S\2. Report6\GS05724115
Rl.doc 1
SITE DESCRIPTION The site is located approximately 1 mile southeast of the intersection of County Road 114 and Red Canyon Road in Garfield County, Colorado. A vicinity map is shown on
Figure 1. The 4.25-acre compressor station site is on private land surrounded by rural ranches, open land and various utility easements and is accessed via a gravel surfaced access road.
Ground surfaces on the parcel slope down to the southwest at grades of 15 to 30 percent. An irrigation ditch is located on the westem portion of the site. Vegetation at the site consisted
of pinion and juniper trees, weeds, grasses, and oak and sage brush. About 6 to 18 inches of snow covered the site at the time of exploratory drilling operations. PROPOSED CONSTRUCTION
Building construction at the site will consist of a 50 feet x 120 feet Compressor Building, a 40 feet x 60 feet Control and Office Building, and a 14 feet x 14 feet Utility Shed. Access
will be via a gravel surfaced access road. Maximum foundation excavation depths will be about 14 feet for the Compressor Building, 8 feet for the Control and Office Building, and 3 to
4 feet (for frost protection) for the Utility Shed are anticipated. Foundation loads of 1,000 to 3,000 pounds per lineal foot of foundation wall are expected for the buildings. The Compressor
Building will house two orthree 82,000 pound compressors. A new gas pipeline will be installed about 5 feet below the existing ground surface along the new access road center line. If
construction will differ significantly from the descriptions above, please contact us so that we can check that our recommendations remain appropriate. SITE GEOLOGY AND GEOLOGIC HAZARDS
Site geology and geologic hazards were evaluated by Edward R. White, P.E., using field reconnaissance on March 7 and 14, 2013 and a review of available HRL COMPLIANCE SOLUTIONS, INC.
SOURCE GAS SPRING VALLEY COMPRESSOR STATION PROJECT NO. G505724·115 S:\(3S05724.000\115\2, Rep0r1S'GS05724 115 Rl.doc 2
literature. The ground surface at the time of our visits was covered by zero to 12 inches of snow. Literature references are cited at the end of this section. We did not observe bedrock
outcrops. Basalt cobbles and boulders were present on the ground surface. Mapping by the Colorado Geological Survey (2008, Reference 2) indicates bedrock materials beneath the parcel
are the Tertiary age Basalt (Tb), an igneous deposit that comprises multiple flows of basalt, basaltic andesite and basaltic trachyandesite and Permian-Pennsylvanian Age Maroon Formation,
an interlayered sedimentary deposit of sandstone, and mudstone red beds with minor limestone. The Maroon Formation in this area dips at about 14 degrees to the north. Bedrock materials
are covered by colluvium deposits (Oc).An excerpt from CGS' 2008 geologic map is reproduced below: '~. I I _ &:i); 2008 CGS Geologic Map of the Carbondale Quadrangle -Scale: Distance
between section lines is about 1 mile or 5280 feet. HRL COMPLIANCE SOLunONS, INC. SOURCE GAS SPRING VALLEY COMPRESSOR STATION PROJECT NO. GS05724-115 5:\0505724.000\115\2. Rlports\GS05124115
Rl .doe 3
Geologic hazards typical in Colorado are described in Reference 3. Brief reconnaissance found no evidence of avalanches, landslides, rockfalls, sinkholes or mudflows and debris fans
at the Source Gas Spring Valley Compressor Station parcel. We believe hydrocompaction collapse potential forthe soil atthe site ranges from nil to high. The clay/clay-silt was found
to have nil to high collapse potential. We have included a collapse potential plot as Figure A-B. Some soils at the site will swell when wetted. Overall swell potential is believed to
be moderate. The soil and bedrock units are not expected to respond unusually to seismic activity. Liquifaction potential is considered nil. We believe most locations on the parcel can
be considered to be Site Class D. Only minor damage to relatively new, properly deSigned and built structures would be expected. On March 14, 2013, our project engineer, Edward R. White,
P. E., visited the site and performed a radiation survey. At the time of our survey, the site had 0 to 12 inches of snow cover. Roughly half the site was free of snow cover. Our survey
consisted of walking along lines the length of the site in a northeast-southwest direction. Lines were spaced approximately 50 feet apart. Radiation measurements were taken with a Ludlum
Instruments, Inc. Model No. 19 Micro-RMeter carried at arms length (approximately 2 feet above the ground surface). Radiation readings were observed by continuously glancing back and
forth from the Micro-R-Meter to the line of travel. We observed radiation measurements averaging approximately 1 micro roentgen per hour. Readings were between 0 and 2 microroentgens
per hour. In our opinion, these readings on the site are indicative of normal background radiation for Garfield County and do not indicate contamination or elevated levels of naturally
occurring radiation sources. We also used a Nilsson Model 400 solid state 4-pin soil resistance meter and a Wenner array to obtain in-situ resistivity readings of the soils using various
pin HAL COMPLIANCE SOLunONS, INC. SOURCE GAS SPRING VALL.EY COMPRESSOR STAnON PROJECT NO. GS05724·115 S:\0505724.000\115\2, Reports\GS05724 115 R1.dot 4
spacings along the proposed gas pipeline alignment. The resistance and resistivity of the soils is presented in the table below. The resistance values are typical for the soil type present
on this site. Pin Spacing Resistance Resistivity (Feet) (Ohms) (Ohm -cm) 5 20 19,150 10 12 23,000 20 7.2 27,641 In summary, we find no geologic hazards that preclude development of this
site for the planned uses. Geology Section References 1. "Surficial Geology, Geomorphology, and General Engineering Geology of Parts of the Colorado River Valley, Roaring Fork River
Valley, and Adjacent Areas, Garfield County, Colorado" by J.M. Soule and B.K. Stover, Colorado Geologic Survey Open File Report 85-1, Plate 1A -Surficial Geologic Map, Plate 2A -Geomorphic
Features Map, Plate 3A -Geologic Hazards Map, and Plate 4A -Construction -Materials Map, 1985 2. "Geologic Map of the Carbondale Quadrangle, Garfield County, Colorado" compiled by Robert
M. Kirkham and Beth L. Widmann, Colorado Geological Survey Map Series 36, 2008 3. "Guidelines and Criteria for Identification and Land-Use Controls of Geologic Hazard and Mineral Resource
Areas" by W.P. Rogers, et. ai, Special Publication 6, Colorado Geologic Survey, 1974 4. Aerial Photography by Google Earth. Date believed to be several years ago. 5. "Collapsible Soils
and Evaporite Karst Hazards Map of the Roaring Fork River Corridor, Garfield, Eagle, and Pitkin Counties, Colorado" by Jonathan L. White, Colorado Geological Survey Map Series 34, 2002.
HRL COMPLIANCE SOLUTIONS, INC. SOURCE GAS SPRING VALLEY COMPRESSOR STATION PROJECT NO. GS05724-115 5;\0505724,000\115\2, Rllports\GS05724 115 Rt.doc 5
FIELD AND LABORATORY INVESTIGATIONS Subsurface conditions were investigated by drilling six exploratory borings and th ree subgrade borings at the approximate locations shown on Figures
2 and 3. Borings were drilled with a 4-inch diameter solid-stem auger and a track-mounted drill rig. Our laboratory/field manager observed drilling operations, logged the soils encountered
in the borings and obtained samples. Summary logs of the soils encountered are presented on Figures 4 and 5. Samples obtained from the borings were returned to our laboratory and visually
classified by the geotechnical engineer. Laboratory tests included Atterberg limits, particle-size analysis, swell-consolidation, water soluble sulfate content and unconfined compression.
Laboratory test results are presented in Appendix A. SUBSURFACE CONDITIONS Soils found in our borings were approximately 6 inches of sandy clay '10psoil" underlain by sandy clay/clay-silt
with lenses of scattered cobbles to the maximum explored depth of 30 feet below the existing ground surface. Subsurface conditions are shown in our boring logs (Figures 4 and 5). Ground
water was not found in our borings during drilling or when checked 2 weeks later. Ground water will not likely affect construction. We reviewed the National Cooperative Soil Survey prepared
by the United States Department of Agriculture (U.S.DA) The Soil Conservation Service (SCS) classifies the soils on the site as Empedrado loam with slopes of 6 to 12 percent, and Showalter-Morval
complex with slopes of 15 to 25 percent. The SCS indicates that sites with these soils may be very limited (poor) to somewhat limited (good) for HRL COMPLIANCE SOLUTIONS, INC. SOURCE
GAS SPRING VALLEY COMPRESSOR STATION PROJECT NO. G505724·115 S:\GS05724.000\115\2. Aeports\GS05724115 A1.C!Ot 6
development of local roads and streets, slopes, and small commercial buildings due to problems related to shrink/swell or low soil strength. The SCS indicates that corrosion of concrete
is low to moderate and corrosion potential of steel may be high. Based on our site specific field and laboratory investigation, we believe mitigation to limit corrosion of steel may
be required; however, the site is not considered "poor" for development. Nearby developments have generally performed well. Natural ClavlClay·SiIt We encountered sandy clay/clay-silt
with occasional basalt cobbles in our borings on the site. Our observations during drilling operations indicated the soil was medium stiff to very stiff. Atterberg limits tests indicated
liquid limits of 31 to 45 percent and plasticity indices of 10 to 27 percent. Swell-consolidation testing on five samples of the soil exhibited 0.2 and 0.7 percent consolidation, no
movement and 0.3 and 3.9 percent swell when a load of 1,000 psf was applied. The soil consisted of 60 to 90 percent silt and clay size particles (passing the No. 200 sieve). EARTHWORK
RECOMMENDATIONS Site Grading Grading plans are being developed at this time. Based on the conceptual plans provided to us, we anticipate that site grading will be limited and consist
of grading required to construct roads and utilities across the site. Grading can be accomplished using conventional construction techniques and heavy-duty equipment. We do not believe
thick fill will be placed. If thick fills are required, it is important that these fills be constructed as far in advance of surface construction as HRL COMPLIANCE SOLUTIONS, INC. SOURCE
GAS SPRING VALLEY COMPRESSOR STATION PROJECT NO. G505124·115 S:\GS05724.000\115\2. ReporU\GSOS724115 AI.doc: 7
possible. It is our experience that fill compacted in accordance with the compaction recommendations in this report may settle about 0.5 to 1 percent of its thickness under its own weight.
Additional settlement occurs from the new fill loading the existing ground. Most of this settlement usually occurs during and soon after construction. Some additional settlement is possible,
especially if the soil moisture content significantly increases. The existing on-site soils are suitable for re-use as fill material provided the soils are free of rocks larger than
6 inches in diameter, debris or deleterious organic materials. Prior to fill placement, all trash and debris should be removed from fill areas and properly disposed. Ground surfaces
in areas to be filled should be stripped of vegetation, topsoil and other deleterious materials, scarified to a depth of at least 8 inches, moisture conditioned and compacted as recommended
below. Site grading fill should be placed in thin, loose lifts, moisture cond~ioned and compacted. In areas of deep fill, we recommend higher compaction criteria to help reduce settlement
of the fill. Placement and compaction of fill should be observed and tested during construction. Guideline site grading specifications are presented in Appendix B. Sub-Excavation and
Structural Fill We are recommending that building foundations be constructed on a minimum 2 feet of moisture treated and compacted structural fill. Areas which will receive fill should
be stripped of vegetation, organic soils and debris. The on-site soil free of organic matter, debris and rocks larger than 3 inches in diameter can be used as structural fill. Import
fill should consist of a CDOT Class 6 aggregate base course or similar soil. HRL COMPLIANCE SOLUTIONS, INC. SOURCE GAS SPRING VALLEY COMPRESSOR STATION PROJECT NO. GS05724-115 S:\GS05724.000\115\2,
Report&\GS05124 115 Rl.doc 8
Structural fill placed below buildings should be placed in loose lifts of 10 inches thick or less and moisture conditioned to within 2 percent of optimum moisture content. Structural
fill should be compacted to at least 100 percent of ASTM D 698 maximum dry density. Moisture content and density of structural fill should be checked by a representative of our firm
during placement. Imported Fill If import material is required for fill, samples from each source should be provided for our review. The material should be placed and compacted as recommended
in Appendix B. Utility Construction We believe excavations for utility installation in the soils at the site can be performed with conventional heavy·duty or large backhoes. Ground water
is not anticipated in excavations at the site. If ground water is encountered during construction in shallow excavations, dewatering can likely be accomplished by sloping excavations
to occasional sumps where water can be removed by pumping. We do not anticipate significant ditch loss from the existing irrigation ditch on the site. If ditch loss adversely affects
construction at the site, the problematic section of ditch could be lined with an impervious plastic membrane or piped. Utility trenches should be sloped or shored to meet local, State
and federal safety regulations. The natural soil will classify as a Type B soil based on OSHA standards. Excavations deeper than 4 feet in Type B soils should be no steeper than 1 to
1 (horizontal to vertical). Excavation slopes specified by OSHA are dependent upon soil types and ground water conditions encountered. Contractors should identify the soils encountered
in excavations and referto OSHA standards to HRL COMPLIANCE SOLUTIONS, INC. SOURCE GAS SPRING VALLEY COMPRESSOR STATION PROJECT NO. GS05724·115 S:\GS05724.000\115\2. Report8\GSD5724
115 R1.doc 9
determine appropriate slopes. Excavations deeper than 20 feet should be designed by a professional engineer. In areas of deeper trench excavation, the width of the top of an excavation
may need to be limited. We believe "trench box" construction could be used. Lateral loads on bracing depend on the depth of excavation, slope of excavation above the bracing, surface
loads, hydrostatic pressures, and allowable movement. For trench boxes and bracing allowed to move enough to mobilize the strength of the soils with associated cracking of the ground
surface, the "active" earth pressure conditions are appropriate for design. If only small movements are tolerable, the "at rest" earth pressures are appropriate. We suggest an equivalent
fluid density of 35 pcf for the "active" earth pressure condition and 50 pcf for the "at rest" earth pressure condition, assuming level backfill. These pressures do not include allowances
for surcharge loading or for hydrostatic conditions. Compaction of trench backfill can have a significant effect on the life and serviceability of the roads. Trench backfill should be
placed in thin, loose lifts, and moisture conditioned to within 2 percent of optimum content. Trench backfill should be compacted to at least 95 percent of maximum dry density (ASTM
D 698). Placement and compaction of fill and backfill should be observed and tested by ou r firm during construction. Backfill soils maximum diameter should be limited to 3 inches to
avoid nesting of larger diameter rock in the trench. FOUNDATIONS Our subsurface information indicates that natural sandy clay/clay-silt with occasional basalt cobbles is present at or
near planned foundation elevations for the buildings. Some areas of the natural soils will consolidate when wetted and some areas of the soil will swell. The foundation should mitigate
the potential HRL COMPLIANCE SOLUTIONS,INC. SOURCE GAS SPRING VALLEY COMPRESSOR STATION pROJECT NO. GS05124·115 S:\GS05724.DOO\115\2, Report&\GS05724115 A1.doc 10
differential soil characteristics. We believe mat foundations will provide good building foundation performance at this site. Buildings can be constructed on mat foundations that are
supported by a 2 foot thick layer of structural fill, placed as recommended in the Sub-Excavation and Structural Fill section. We would anticipate maximum differential foundation movement
will be about 1/2 inch for a mat foundation. If the natural soils get saturated, more movement could occur. Utilities to the structures need to be constructed with some flexibility to
account for building movement. Our representative should observe conditions in the completed foundation excavations to confirm whether the exposed soils are as anticipated and suitable
for the designed foundations. Criteria for mat foundations are provided below. Mat Foundations 1. The reinforced concrete mat foundation can be constructed on a 2 foot thick layer of
structural fill. Structural fill should be placed as recommended and should be checked by a representative of CTL. 2. The mat foundation should be designed for a maximum allowable soil
pressure of 1,000 psf if constructed on a 2 foot thick layer of structural fill. 3. Modulus of subgrade reaction (K,) is normally used for mat foundation design. The modulus of subgrade
reaction is dependent upon the compressibility of the foundation soils and the size (or effective loaded area) of the foundation. If the entire mat foundation is uniformly loaded, then
a K, value of 75 pci should be used for the soils. 4. To resist lateral loads, a coefficient of friction of 0.35 can be used for concrete in contact with the natural soil. Lateral loads
can be resolved by evaluating passive resistance using an equivalent fluid density of 200 pcl for the clay/clay-silt, provided the backfill is compacted and is not removed. A moist unit
weight of 120 pcf can be assumed for backfill soils. These values have not been factored; appropriate factors of safety should be applied in design. HRL COMPLIANCE SOLUTIONS, INC. SOURCE
GAS SPRING VALLEY COMPRESSOR STATION PROJECT NO. GS05724·115 S:\GS05124.000\115\2. Reporta\GSIJ5724 115 Rl.doc 11
5. Soil beneath the foundation must be protected from freezing. We recommend the bottom of the foundation be constructed at a depth of at least 36 inches below finished exterior grades.
The Garfield County building department should be consulted regarding required frost depths. FLOOR SYSTEM AND SLABS-ON-GRADE The mat foundation will serve as the floor slab. Structural
fill required below slabs should be placed and compacted as recommended in the Sub-Excavation and Structural Fill section. Backfill below exterior slabs-on-grade will settle. In areas
of deep backfill, a positive alternative to reduce slab movement is the provision of a structural slab. BELOW-GRADE CONSTRUCTION Excavations for the Compressor Building and Control and
Office Building foundations will result in foundation walls which extend below-grade on the uphill side. These walls should be designed for lateral earth pressures where backfill is
not present to about the same extent on both sides of the wall. Excavations for the building foundations can likely be laid back at a 1 to 1 (horizontal to vertical) slope. The need
for excavation retention is not anticipated. If earth retention is needed, we should be contacted to develop the earth retention plans. Many factors affect the values of the design lateral
earth pressure. These factors include, but are not limited to, the type, compaction, slope and drainage of the backfill, and the rigidity of the wall against rotation and deflection.
For a very rigid wall where negligible or very little deflection will occur, an "at-rest" lateral earth pressure should be used in design. For walls which can deflect or rotate 0.5 to
1 percent of wall height (depending upon the backfill types), lower "active" lateral earth pressures are appropriate. Our experience indicates typical below-grade walls deflect or rotate
slightly under normal design loads, and that this deflection results in satisfactory HRL COMPLIANCE SOLUTIONS, INC. SOURCE GAS SPRING VALLEY COMPRESSOR STATION PROJECT NO. G505724·115
S:\0505724.000\115'\2, Report8\GS05724 115 Rl.doc 12
wall periormance. Thus, the earth pressures on the walls will likely be between the "active" and "at-rest" conditions. If the on-site soils are used as backfill, we recommend design
of below-grade walls using an equivalent fluid density of at least 50 pcf for this site. This equivalent density does not include allowances for sloping backfill, surcharges or hydrostatic
pressures. Backfill placed adjacent to foundation wall exteriors should be placed and compacted as described in Appendix B. SUBSURFACE DRAINAGE Water from rain, snow melt and suriace
irrigation frequently flows through relatively permeable backfill placed adjacent to a building and collects on the suriace of relatively impenmeable soils occurring at the bottom of
the excavation. This can cause wetting of foundation soils and hydrostatic pressures on belowgrade walls. We recommend provision of a foundation drain around below-grade areas in the
Compressor Building and Control and Office BUilding. The drain should consist of a 4-inch diameter, slotted PVC pipe encased in free draining gravel. The drain should lead to a gravity
outlet or sump pit where water can be removed by pumping. A typical foundation drain detail is presented on Figure 6. SURFACE DRAINAGE Suriace drainage is critical to control risk of
wetting below the buildings and the periormance of foundations, floor slabs and concrete flatwork. We recommend the following precautions, at a minimum, be observed during construction
and maintained at all times after the planned construction is completed: 1. The ground suriace surrounding the exterior of the buildings should be sloped to drain away from the buildings
in all directions. We HRL COMPLIANCE SOLunONS, INC. SOURCE GAS SPRING VALLEY COMPRESSOR STATION PROJECT NO. GS05724·115 S:\GS05724.000111S\2. ReportslGSOS724115 Rl.doc: 13
recommend providing a slope of at least 12 inches in the first 10 feet around the buildings, where possible. 2. Backfill around the exterior of foundation walls should be placed as described
in Appendix B. Increases in the moisture content of backfill soils after placement can result in settlement. This settlement is most common adjacent to north facing walls. 3. Impervious
plastic membranes should not be used to cover the ground surface immediately surrounding the buildings. These membranes tend to trap moisture and prevent normal evaporation from occurring.
Geotextile fabrics can be used to control weed growth and allow some evaporation to occur. General Design Considerations Exteriorflatwork is subject to post construction movement. Flat
grades should be avoided to prevent possible ponding, particularly next to buildings due to soil movement. Positive grades away from the buildings should be used for sidewalks and flatwork
around the perimeter of the buildings in order to reduce the possibility of movement of this flatwork, resulting in ponding next to the structures. Joints next to buildings should be
thoroughly sealed to prevent the infiltration of surface water. Since some post construction movement of flatwork may occur, joints around the buildings should be periodically observed
and resealed where necessary. Roof drains should discharge well away from the structures, preferably by closed pipe systems. Where roof drains are allowed to discharge on concrete flatwork
next to the structures, care should be taken to insure the area is as water tight as practical to eliminate the infiltration of this water next to the buildings. HRL COMPLIANCE SOLUTIONS,
INC. SOURCE GAS SPRING VALLEY COMPRESSOR STATION PROJECT NO. G505724·115 5:\0505724.000\115\2. Rapol"ls\GSOS724 115 Rt.doc 14
CONCRETE Concrete that comes into contact with soil can be subject to sulfate attack. Concentrations were measured in 3 samples of the natural soil from the site at 0.00 percent. For
this level of sulfate concentration, ACI 318-0 Code Requirements for Structural Concrete indicates there are no special requirements for sulfate resistance. In our experience, superficial
damage may occurto the exposed surfaces of highly permeable concrete, even though sulfate levels are relatively low. To control this risk and to resist freeze-thaw deterioration, the
water-to-cementitious materials ratio should not exceed 0.50 for concrete in contact with soils that are likely to stay moist due to surface drainage or high water tables. Concrete should
have a total air content of 6% +/-1.5%. We recommend damp-proofing of all concrete walls in contact with soil, including buried grade beams, to control moisture penetration into the
concrete. GRAVEL ACCESS ROAD Natural soils at this site are a fair to poor subgrade material and classify as AASHTO Group A-6 and A-7 with a group index between 6 and 24. The road sub
grade should be scarified to a depth of at least 6-inches, moisture treated to within 2 percent of optimum moisture content, and compacted to at least 95 percent of standard Proctor
dry density (ASTM D 698). Ponding and low spots on the subgrade surface should be avoided. We believe improved road and drive performance can be achieved by the placement of a geotextile
fabric separator on the prepared subgrade. The fabric reduces the chance of gravel being worked into the clay subgrade. Our experience is that a minimum of 6 inches of CDOT Class 6 aggregate
base course should be placed on the fabric as a drive surface. Positive drainage should be provided in the area of the proposed gravel road. HRL COMPUANCE SOLunONS, INC, 15 SOURCE GAS
SPRING VALLEV COMPRESSOR STATION PROJECT NO. GS05724·115 S:\GS05724.000\115\2. Repcrt&\GS05724 115 R1.dnc
FINAL DESIGN CONSULTATION AND CONSTRUCTION OBSERVATIONS This report has been prepared for the exclusive use of HRL Compliance Solutions, Inc. and the design team to provide geologic
and geotechnical criteria. Information, conclusions and recommendations presented herein are based upon the considerations of many factors including, but not limited to, the type of
development proposed, the configuration of the development, the geologic setting, and the subsurface conditions encountered. Conclusions and recommendations contained in the report are
not valid for use by others. CTL I Thompson, Inc. should be retained to provide geotechnical consultation forthe project when plans are further developed. Our firm should also be retained
to provide geotechnical engineering and material testing during construction of the site grading, utilities, and drainage features. The purpose is to observe the construction with respect
to the geotechnical design concepts, specifications or recommendations, and to facilitate design changes in areas where the subsurface conditions differ from those anticipated before
the start of construction. Based on the results of this investigation and the proposed development, we recommend the following investigations be performed: 1. Review of final site grading
plans by our firm; and 2. Construction testing and observation for site development and building construction. HRL COMPLIANCE SOLUTIONS, INC. SOURCE GAS SPRING VALLEY COMPRESSOR STATION
PROJECT NO. GSOS724-11S S:\GSD5724.000\115\2. RepoJ1s\GS05124 1'5 A1.doc 16
GEOTECHNICAL RISK The concept of risk is an important aspect of any geotechnical evaluation. The primary reason for this is that the analytical methods used to develop geotechnical recommendations
do not comprise an exact science. Analytical tools which geotechnical engineers use are generally empirical and must be tempered by engineering judgment and experience. Therefore, the
solutions or recommendations presented in any geotechnical evaluation should not be considered risk-free and, more importantly, are not a guarantee that the interaction between the soils
and the proposed structure will perform as desired or intended. What the engineering recommendations presented in the preceding sections do constitute is our estimate, based on the information
generated during this and previous evaluations and our experience in working with these conditions, of those measures that are necessary to help the development perform satisfactorily.
The owner must understand this concept of risk, as it is they who must decide what is an acceptable level of risk for the proposed development of the site. LIMITATIONS Our exploratory
and subgrade borings were located to obtain data indicative of subsurface conditions on this site. Although our borings were spaced to obtain a reasonably accurate picture of subsurface
conditions, variations in the subsoils not indicated in our borings are always possible. We believe this investigation was conducted in a manner consistent with that level of skill and
care ordinarily used by members of the profession currently practicing under similar conditions in the locality of this project. No warranty, express or implied, is made. This report
was prepared from data developed during our field exploration, laboratory testing, engineering analysis and experience with similar conditions. The recommendations contained in this
report were based upon our understanding of HAL COMPLIANCE SOLUTIONS, INC. SOURCE GAS SPRING VALLEY COMPRESSOR STATION PROJECT NO. G805724·115 S;\GS05724,OOO\1,5\2. RBports\GS05724115
R1.doc 17
the planned construction. If plans change or differ from the assumptions presented herein, we should be contacted to review our recommendations. If we can be of further service in discussing
the contents of this report or in the analysis of the buildings and road from the geotechnical point of view, please call. l;e~.~ David A. Glater, P.E., C.P.G. Principal Geological Engineer
ERW:JM:DAG:cd cc: Via email to alane@hrlcomp.com HAL COMPLIANCE SOLUTIONS, INC. SOURCE GAS SPRING VALLEY COMPRESSOR STATION PROJECT NO. GS05724·115 S:\GS05724.DOO\11 5\2. Reports\GS05724
11 5 R1.doc 18
HRL COMPLIANCE SOLVTlONS, INC. SOURCE 0A8 SPRlI1Q VAJ.J.E'( COMPRE880A STATIOfI,I Project No. GS05724-115 Vicinity Map Fig. 1
+ + MATC1::lUI'iLJ I I \ \ \ \ \ \ \ PROPOfRIY Q'MJEB J &: S NIESLANIK LLlP (2393-032-00-032) HAL OOMPl.1ANCE SOLUTlONS, INC. IIOURCECIA8_INQVAL.I..EV~FI BTA'TION Project No. GSQ5724-115
--+-:0 -/'<j NE CORNE SECTION J J 1/4" BlM AWl.!. CAP MATCHLlN.L , I I I I I I I I I \ \ \ \ \ I \ \ \ \ I \ \ I I I I I I I I I I I I I I I //I I , I I I I I I /1-2 I /I I I I ,/" !
/I I I ,I I I I I -1-MATC1::l UI'iLJ 7 MATCHUNE_~ Locations of Exploratory and Subgrade Borings (Overall) Fig. 2
SCALE: 1'= 50' HRL COMPLIANCE SOLlJTIONS, INC. SOURCE GAS SPRING VAUFf COMPRESSOA &TAllON Project No. GS05724-115 Locations of Exploratory Borings (Compessor Station) Fig. 3
o 5 10 l[' o 20 2. 30 TH-l ELm7188 36/12 ~"p TH-2 EL=71n [~'" ~50/11 TH-3 EL=7188 [~" 50/8 ~ L ____________ Com~~~r ____________ ~ Building 35 Projoct No. GS05724-125 TH-4 EL=7163 [~"
40/12 utnHy Shod TH-5 EL=7184 r"' ~--.. TH-6 EL=71n !MN 50/12 50/12 L-Control and --.J Office Bundlng S-1 SUMMARY LOGS OF EXPLORATORY BORINGS S-2 S-3 .. o 33/12 5 10 'J J 3" .. 20 ~
25 30 35 Rg.4
LEGEND: § I2J [] Sandy clay -fopeoU-. medium I'IIff. moIst. brown. Clay. clay-snt. sandy. occasional grav.... cobble. and boutdera. medium stIff to very stIff. dry to sllghtty moist.
brown. light brown. (CL, CL-IotL) Sand, cia,.,., occoalonal gravel. dense. slightly moist, brown. (SC) P"'Joct No. GS05724-125 P F ~ T Drive sample. The .yrnbol 36/12 Indicate. thot
36 blows of a 140 pound hammer failing 30 Inches ...... requlnJd to drive a 2.5 Inch 0.0. California sampler 12 Inches. Bulk sample from auger cuttrngs. DrIve sample. Th. symbol 51/7
Indicate. that 51 blows of a 1040 pound hammer failing 30 Inches we ... NquJred to drive Q 2.0 Inch O.D. standard sampler 7 Inchn. Indicates practical auger refusal. Symbols above the
bottom of borings Indicates that boring locatIon was moved to advance auger farther. NOT£S: 1. Exploratory borfn". we... drflled on February 19 and 20. 2013 with "-Inch dIameter. continuous-flight
solid-stem auger and a track-mountltd drffl rfg. 2. locations of exploratory borings ar. approximate. 3. No free ground water wa. found In our ~oratory borings at the time of drilling.
4. These explorotory borlnga or. subject to th. explanotlona. nmHatlona and conclusions as contained In thIs repor1. SUMMARY LOGS OF EXPLORATORY BORINGS 9P Flg. 5
COVER ENllRE WIDTH OF GRAVEL WITH NON-WOVEN GEOTEXTILE FABRIC (MIRAFI 140N OR EQUNALENO. ROOFING FELT IS AN ACCEPTABLE ALTERNATNE. SLOPE ATTACH P~C SHEETING TO FOUNDA1l0N WAlJI:"""\
BELOW-GRADE WALl ENCASE PIPE IN 1/2" TO 1-1/2" WASHED GRAVEL FILL ENllRE TRENCH WITH GRAVEL NOTE: 4-INCH DIAMETER PERFORATED RIGID DRAIN PIPE. THE PIPE SHOULD BE PLACED IN A TRENCH WITH
A SLOPE OF AT LEAST 1/B-INCH DROP PER FOOT OF DRAIN. THE BOTTOM OF THE DRAIN SHOULD BE AT lEAST 4 INCHES BELOW BOTTOM OF POST-TENSIONED SLAB AT THE HIGHEST POINT AND SLOPE DOWNWARD TO
A POSITIVE GRAVITY OUTlET OR TO A SUMP WHERE WATER CAN BE REMOVED ff'( PUMPING. HRL COmpliance Solutions. Inc. Source OU Spring Valley Compl'88lOr StatIOn Project No. GS05727 -115 Exterior
Foundation Wall Drain Fig. 6
APPENDIX A LABORATORY TEST RESULTS HRL COMPLIANCE SOLUTIONS, INC. SOURCE GAS SPRING VALLEY COMPReSSOR STATION PROJECT NO. GS05724·115 S:\GSOS724.000\115\2, Report5\GS05724 115 RI.doc
7 I I 6 -NO MOVEMENT DUE TO WETIING 5 -_ .. -----i 4 3 2 II i /J o II ·1 ·2 ·3 zo ·4 ezn « a. >< ·5 W z 0·6 en en w a: a. ·7 :;; o () ·8 ! i I -01 --i---1'--, r-I~ -. --I APPLIED PRESSURE
-KSF Sample of CLAY, SANDY (Cl) From TH-2 AT 4 FEET HRL COMPLIANCE SOLUTIONS, INC, /~ -! 1.0 SOURCE GAS SPRING VALLEY COMPRESSOR STATION PROJECT NO, GS05724-1 15 S:\GSOS724.000\115'16.
CalcslGSOS724 115 Swell.xls , , , i "'-I ! \ -----\ -I -10 DRY UNIT WEIGHT = MOISTURE CONTENT = I --! I 1 I-i I i i I 1 I 1DO 90 PCF 11.0 % Swell Consolidation Test Results FIG,A·1
6 5 4 3 2 o -1 -2 -3 z 0-izii « a. XLU "if. z o iii <II LU II: a.::;: o (.) 4 5 6 7 8 9 0.1 , j I ----~ i'-f'\ APPLIED PRESSURE -KSF Sample of CLAY, SANDY (el) From TH-3 AT 14 FEET HRL
COMPLIANCE SOLUTIONS, INC_ J 1\ I 1.0 SOURCE GAS SPRING VALLEY COMPRESSOR STATION PROJECT NO. GS05724·115 S:\GSOS724.00Q\11 Sl6. Ce.lcsIGSOS724 115 Swell.xls /II ----\ ~ I II ADDITIONAL
COMPRESSION UNDER CONSTANT PRESSURE DUE TO I I i , j 1\ ~ i -10 DRY UNIT WEIGHT. MOISTURE CONTENT. I ~ -I I I n 100 79 PCF 13.9 '% Swell Consolidation Test Results FIG.A-2
3 I ! 2 V V-•.. z '" I'-l"-0 0 -t-r---... ~ zVi « 11. , I' '). I ·1 X LU '1ft Z ·2 I 0 eVni LU II: ·3 11. I ~ 0 U ·4 0.1 1.0 APPLIED PRESSURE -KSF Sample of CLAY, SANDY (Cl) From TH-4
AT 14 FEET 3 2 ~ 0 Vi ~ ·1 LU I , ------j I ! , , ---+---,l I i , , I ./z o ·2 Vi f3 'I .~ I ---~ I I 1-1-I II: 11. ·3 ~ ou -4 0.1 APPLIED PRESSURE -KSF Sample of From CLAY, SANDY (el)
TH-S AT 9 FEET HRL COMPLIANCE SOLUTIONS, INC. , I 1.0 SOURCE GAS SPRING VALLEY COMPRESSOR STATION PROJECT NO. GS05724-115 $:\1350572-4.000\115\6, Calc$\GS05724 115 Swelt.ls I II //.
.. ~ 11 EXPANSION UNDER CONSTANT PRESSURE DUE TO WETIING I I I ! . 10 DRY UNIT WEIGHT = MOISTURE CONTENT = I I· f-. 100 105 PCF 17.8 % ADDITIONAL COMPRESSION UNDER CONSTANT PRESSURE
DUE TO WETIING ---.. -----"----. I i i . j--I 10 DRY UNIT WEIGHT = MOISTURE CONTENT = ~ --~--------91 8.9 -_ . 100 PCF % Swell Consolidation FIG.A·3
7 6 5 4 3 2 o ·1 ·2 ·3 z 0·4 (ii Z ct a. X ·5 W z 0·6 (ii !3 a: a. ·7 ::;: o u ·8 ----------.. I---0.1 1 , I/V '\ "-r---II APPLIED PRESSURE -KSF Sample of CLAY, SANDY (Cll From TH-6
AT 9 FEET HRL COMPLIANCE SOLUTIONS, INC. V ~ . 1.0 SOURCE GAS SPRING VALLEY COMPRESSOR STATION PROJECT NO. GS05724-115 S:\GS05724.000\115'16. Calcs\GS05724115 Swell.xl5 I I I II I I
I EXPANSION UNDER CONSTANT PRESSURE DUE TO WETTING . .. . ~ i .'" '\ ~ '\ 1'\ :> \ , i I I -.. ----. -I I --!-T I I 10 DRY UNIT WEIGHT ~ MOISTURE CONTENTo 113 10.1 Swell Consolidation
Test Results .. 100 PCF % FIG.A-4
HYDROMETER ANAL Y51S 25HR 7HR 45MIN 15MIN 90 eo §?70 ~ ~60 ~ ~50 = = ffi= Il. 40 ===--:--TIME READINGS 60WIN.19MIN 4 MIN 1 MIN '200 '100 = ::~.~~= -I~~ ~~~:~-SIEVE ANALYSIS U.S. STANDARD
SERIES CLEAR SQUARE OPENINGS '50 '40 '30 '15 '10'6 '4 3B' 3'4 1 , 5· ~ , = I==---~ -~ = :::j 0 j ,'0 -== .. 0 :.0 wz = "~ '0 w ~ r--::c ~~= ~ ~ .... i::C::= ==. ";jI~~~, ~ 30 ..... -20
o .0{)1 0.002 005 .009 .019 .037 CLAY (PLASTIC) TO SILT (NON, PLASTIC) Sample of SAND, CLAYEY (SC) From TH-i AT 19 FEET HYDROMETER ANALYSIS 25 HR. 7 HA. TIME READINGS 45 MIN. 15 MIN
100 60 MIN 19 MIN. 4 MIN. 1 MIN 90 :::--BO ----..:.. I.e:. r---20 10 o .001 0.002 .005 009 .019 ,037 CLAY (PLASTIC) TO SILT (NON-PLASTIC) Sample of From CLAY, SANDY (CLl TH-3AT9FEET
HRL COMPLIANCE SOLUTIONS, INC, ,074 .149 29' .590 0.42 1.19 2.02.38 476 952 191 361 00 E 90 _.. 100 76~127 200 152 DIAMETER OF f'AATlCLE IN MILLIMETERS '200 FINE '100 SANDS MEDI;JM COARS
FINE GRAVEL COARSE COBBLES GRAVEL 17 % SILT & CLAY 42% PLASTICITY INDEX SIt:VE ANALYSIS SAND LlOUID"LIMIT U.S. STANDARD SEAlES CLEAR saUARE OPENINGS '50 '40 '30 '16 '10 '1\ '4 9/" 3/4'
1y," " !-=:..:. ---_. = ----'--41 % % % 5'6' 8' 0 1 o 1=2 o , --I-I-I-4 --I-' E 70 80 i ~-Ij ~ '-'-' , 1 90 074 .149 2970.42.590 1.19 2.0238 476 9.52 19.1 35.1 00 76.2 127 200 152 DIAMETER
OF PARTICLE IN MILUMETERS SANDS FINE MEDIUM GRAVEL CQARS FINE COARSE COBBLES GRAVEL 0/0 SAND SILT & CLAY 79 % LIQUID LIMIT PLASTICITY INDEX 20 % % % SOURCE GAS SPRING VALLEY COMPRESSOR
STATION PROJECT NO, GS05724-115 Gradation Test Results 5:\GS05724.000\115\6. Calcs1GS05724115 Gradation .. o:l& FIG. A-5
25HR 7HR 45 MIN 15 MIN 100 90 eo 070 ~60 ~ ~50 0. 40 ---30 1 ___ 0. HYDROMETER ANALYSIS TIME READINGS 60MIN. 19 MI~' 4 MIN. 1 MIN SIEVE ANALYSIS U.S. STANDARD SERIES CLEAR SQUARE OPENINGS
'200 '100 '50 '40 "30 '16 '10 '6 '4 318' 314" lW 3' 5'6' P," ,~ .J.$-$.-.--_~i~:rTTI -~ -100 -:c::] +-+-"±-. --t---~-.---.-----. ---= =-:: 60 ---,70 20 10 o .001 0.002 o ICc· -Cl--c.-c-_I-c
~~=-~ ~~~ ~=I-=±==I. ._""=Lci"~-:C-.-'1:.-~~~~ ~?~~. .005 .009 .019 .037 .074 149 .297 .590 1.19 2.02.36 4.7€ 9.52 19.1 36.1 ~. 90 -, ---=: 100 76.2 127 200 0.42 152 DIAMETER OF PARTiCLE
IN MILLIMETERS CLAY (PLASTIC) TO SilT (NON·PLASTIC) FINE Sample of CLAY, CLAY-SILT,SANDY (CL, CL-ML) From TH -6 AT 19 FEET HYDROMETER ANALYStS SANDS MEDIUM COARS FINE GRAVEL GRAVEL COARSE
5% COBBLES SILT & CLAY· -85 % PLASTICITY IN~ SAND LIQUID LIMIT SIEVE ANALYSIS 25 HR. 7 HR TIME READINGS U.S. STANDARD SERIES CLEAR SQUARE OPENINGS t5MIN 15MIN 60 MIN. 19MIN. 4MIN. lMI,.,
'200 'IDa '50 '40 '3D '16 '10 'S ., 318-314" 11'/90 eo 10 % % % WO --r-I-~ ~o~-e-~~4--i--+--~~~~-+~-~-+-44--I--+-~-~--+-~~ ~o rr w ~O I-------I---I----+_---I----+----~---I-~~--_f--~·c_--+_--_+--_f--_
f----~--I 30 I---~----~~ .--I~ --I_-+-~_++-__I-+i--~--+_-j--I--~-_+i_1 10 c_--~----~--+_---\·--_f----·c_---I_--_+_f_fI---+_~~---\----~--+_--4---_f--~t_J o .001 0.002 .005 .009 .019 .037
.074 .149 .297 .590 1.19 2.0 2_36 4.76 0.42 9.52 '9.1 361 DIAMETER OF PARTiCLE IN MUIMETERS SANDS GRAVEL CLAY (PLASTIC) TO SILT (NON·PLASTlC) FINE MEDIUM CDARS FINE COARSE COBBLES Sample
of CLAY, SANDY (CL) From S -1 AT 0-8 FEET HRL COMPLIANCE SOLUTIONS, INC. SOURCE GAS SPRING VALLEY COMPRESSOR STATION PROJECT NO. GS05724·1 1 5 S:\GS05724.000\115\6. C,Ics\GS05724 115
Gradation.xis GRAVEL 9 % SAND SILT & CLAY 60 % LIQUID LIMIT PLASTICITY INDEX Gradation Test Results 31 % % % FIG. A·6
HYDROMETER ANALYSIS SIEVE ANALYSIS 25 HR 7 HR TIME READINGS U_S STANDARD SERIES 45 MIN. 15MiN. 60 MIN_ 19MIN. 4MIN. 1 MIN. '200 '103 '50 '40 '30 '16 '10 '8 . , "0 80 === .' f------'
c·· .:::==-.. '",-= f=. 1.::,1=: 1= 0.~_002 ~I==--.005 .009 .019 .037 074 .149 .2970.42.590 1.19 2.02,38 4_76 DIAMETER OF PARTICLE IN M;LlIMETERS SANDS CLEAR SQUARE OPENINGS 318' 314'
1\j,' , . 5' 6' R' 0 r--" 20 30 40 50 '" = 70 " 1== I::: 90 ._. tOO 952 19_1 361 76.2 127 200 "2 GRAVEL CLAY (PLASTIC) TO SILT (NON·PLASTIC) FINE MEDIUM COARS FINE COARSE COBBLES a w
z "tu <r ~ z w 0 'w" ~ Sample of From CLAY, SANDY (CL) S -2 ATO:il FEET GRAVEL 2 % SILT & CLAYg6" % PLASTICITY INDEX SAND LlOUID LIMIT 8% % % HYDROMETER ANALYSIS SIEVE ANALYSIS 2S HR.
7 HR TIME READINGS U.S. STANDARD SERIES CL!:AR SQUARE OPENINGS 45MIN 15MIN 60MIN 19MIN. 4MIN, 1 MIN. "200 '100 '50 '40 '3~ '16 '10 '8 '4 318" 314' m' 3' 5'0' S' 100 r====:CCCC~L =-.....
~O. 93 ~ . , ------:-~J --.-.~__ 10 aD i=::c::=:·.. . 4~ .• . '-':::' ~~:~j@r=~ .~~.• .~~. j=-;-~.t=~.~ ... J ::~;==.=~=~:-=~.~.~.~=~.· ·=·:·tl-~:··j20 ",,0 -------------1.....;.:I_""1--:t=r.::c.:c.
j' ........:...c~~=:=:=-== '-Ie::-' ... .... ..1="= =:: 30 ~ ~o . --=r----=r-J -~ --I-.-c±:::I ... I-=----=--=-~ c-·=j-.c-.:c-+=~-.--:cl...---...j-=-._:+--\0 ~ ~ i i ~ t)5'J -~-----.'
------I~--~--·------++-+--1--+--_!---.: ___ ~------:!so UJ W:: L..r----t==_-.I--_·_ u -1 __ +--_',1 ' +-f-+ --I--tl .-+-_+_~~. ~-eel:: ~ I ........ t·· .• I I i --1---1 ire 20 ------f----------...
I.--i--L--+~T-I--f---++-----+ f-80 10·-..... .-1-1--+_.11,---.--.---~··ll I --1--+--1--------, I-90 o .:-:--""'~ ___ -' ___ ~ L _, __ L~ _,_l-L-' _,LL _ '_'~::-"''-"-.':-:-L~c'c:'" .1
__ -'-__ ---'.-" _.LL-'-----' __ • L~_..':_'~~I:-,~ 100 .001 0.002 .005 .009 .019 .037 .074 .149 .297 .590 1.19 2_02.38 4,76 $,52 19.1 36.1 76;' 12/-;00 0.42 152 DIAMETER OF PARTICLE
IN MILLIMETERS CLAY (PLASTIC) TO SILT (NON· PLASTIC) Sample of CLAY, SANDY (CL) From S -3 AT 0·8 FEET HRL COMPliANCE SOLUTIONS, INC. FINE SOURCE GAS SPRING VALLEY COMPRESSOR STATION
PROJECT NO. GS05724-115 S:\GS0572-tOO0\115\6. CHics\GS05724 115 Gr8d8tiorul~ SANDS MEDIUM GRAVEL CDARS FINE COARSE COBBLES GRAVEL 4 % SAND SILT & CLAY 82 % LlOUID LIMIT PLASTICITY INDEX
Gradation Test Results 14 % % % FIG. A·)
-~ (.) Co ~ ~ 's": CD o .>..o 135 125 115 105 95 85 75 Plot of M-D Data Overlayed on Proposed Collapse-Susceptibility Boundaries § E ~ Low to no 0 potential • "apse E Low to m derate
• ~collapsap ntidL __ -+~. __ ~ _ ~ ___ +-__ +-________ ~ ______ -1 ________ ~ ~ t: • ~ f Moderate to high r.:nll::tnbp. ·1\ \ j iii: T 5.0 10.0 15.0 20.0 25.0 30.0 35.0 HRL COMPLIANCE
SOLUTIONS, INC. SOURCE GAS SPRING VALLEY COMPRESSOR STATION PROJECT NO. GS05724-115 Moisture Content (%) Note: proposed collapse-susceptibility boundaries estimated from "Engineering
Geology 14, Collapsible Soils in Colorado" Colorado Geologic Survey, 2008. Figure 4-13 Fig. A -8
MOISTURE DRY DEPTH CONTENT DENSITY BORING (FEETJ (OO) IPeF) TH-1 4 TH·' 15-17 6.5 TH·' 19 4.0 TH·2 4 11.0 90 TH-2 9 10.9 TH-2 24 2.1 TH-3 9 12.5 110 TH·3 14 13.9 79 TH-3 29 11.4 106
TH-4 4 TH-4 9 10.8 TH-4 14 17.8 105 TH-S 9 8.9 91 TH-S 14 13.4 116 TH-6 4 TH-6 9 10.1 113 TH-6 14 12.0 103 TH-6 19 10.1 5-1 0-8 6.8 5-2 0·8 8.1 S-3 0-8 7.1 ATTERBERG LIMITS lIOUID PLASTICITY
LIMIT INDEX (%J (%J 36 10 37 16 NL NP 36 20 43 24 34 12 31 15 41 27 45 23 TABLE A-I SUMMARY OF LABORATORY TESTING PROJECT NO. GS05724-115 SWELL TeST RESULTS' SWELL UNCONFINED SOLUBLE
SWELL PRESSUAE COMPRESSION SULFATES (%J (PSF) (PSFJ (%J 0.000 00 -0.7 16,300 0.000 0.3 1,500 -0.2 0.000 3.9 9.400 • SWEll MEASURED WITH 1000 PSF APPL1ED PRESSURE. OR ESTIMATED IN-SITU
OVERBUROEN PRESSURE. NEGATIVE VALUE INDICATES COMPRESSION. ¥ PASSING PERCENT PERCENT NO. 200 GRAVEL SAND SIEVE (%) (OO) (OO) DESCRIPTION CLAY. SANDY Cl 23 SAND,CLAYEY se 17 41 42 SAND,
CLAYEY se CLAY. SANDY Cl CLAY. SANDY eL) SAND, CLAYEY se 1 20 79 CLAY, SANDY Cl CLAY, SANDY (eLl CLAY, SANDY ell CLAY, SANDY CL 79 CLAY, SANDY CL CLAY,SANDY(CL CLAY,SANDY CL 82 CLAY,
SANDY (Cl CLAY, SANOY (CL CLAY, SANDY Cl 83 CLAY, SANDY (CL) 5 10 85 CLAY, CLAY-SILT, SANDY (Cl, Cl-Ml 9 31 60 CLAY. SANDY (CL 2 8 90 CLAY, SANDY eL) 4 14 82 CLAY, SANDY {CLl Pilge10fl
APPENDIXB GUIDELINE SITE GRADING SPECIFICATIONS HAL COMPLIANCE SOLUTIONS, INC. SOURCE GAS SPRING VALLEY COMPRESSOR STATION PROJECT NO. GS05724·115 S:IGS05724.000\115\2. Aeporlll\GS05724115
R1.doc
GUIDELINE SITE GRADING SPECIFICATIONS 1. DESCRIPTION This item shall consist of the excavation, transportation, placement and compaction of materials from locations indicated on the
plans, or staked by the Engineer, as necessary to achieve preliminary road and overlot elevations. These specifications shall also apply to compaction of excess cut materials that may
be placed outside of the development boundaries. 2. GENERAL The Soils Engineer shall be the Owner's representative. The Soils Engineer shall approve fill materials, method of placement,
moisture contents and percent compaction, and shall give written approval of the completed fill. 3. CLEARING JOB SITE The Contractor shall remove all vegetation and debris before excavation
or fill placement is begun. The Contractor shall dispose of the cleared material to provide the Owner with a clean and neat appearing job site. Cleared material shall not be placed in
areas to receive fill or where the material will support structures of any kind. 4. SCARIFYING AREA TO BE FILLED All topsoil and vegetable matter shall be removed from the ground surface
upon which fill is to be placed. The surface shall then be plowed or scarified until the surface is free from ruts, hummocks or other uneven features, which would prevent uniform compaction.
5. COMPACTING AREA TO BE FILLED After the foundation for the fill has been cleared and scarified, it shall be disked or bladed until it is free from large clods, brought to the proper
moisture content (within 2 percent of optimum moisture content) and compacted to not less than 95 percent of maximum dry density as determined in accordance with ASTM 0698. 6. FILL MATERIALS
Fill soils shall be free from organics, debris or other deleterious substances, and shall not contain rocks or lumps having a diameter greater than six (6) inches. Fill materials shall
be obtained from cut areas shown on the plans or staked in the field by the Engineer. HRL COMPLIANCE SOLUTIONS, INC. SOURCE GAS SPRING VALLEY COMPRESSOR STATION PROJECT NO. GS()5724·115
S:IGS0S724.000\115\2. RepDrt8\QS0S724 115 R1.doc 8-1
On-site materials classifying as CL, CL-ML, CH, SC, SM, SW, SP, GP, GC and GM are acceptable. Concrete, asphalt, organic matter and other deleterious materials or debris shall not be
used as fill. 7. MOISTURE CONTENT AND DENSITY Fill material shall be moisture conditioned and compacted to the criteria in the table below. Maximum density and optimum moisture content
shall be determined from the appropriate Proctor compaction tests. Sufficient laboratory compaction tests shall be made to determine the optimum moisture content for the various soils
encountered in borrow areas. FILL COMPACTION AND MOISTURE REQUIREMENTS Soil Depth from Moisture Requirement Final Grade Type (feet) (% from optimum) Density Requirement Clay o to 15
feet -2 to +2 95% of ASTM D 698 Gravel -2 to +2 95% of ASTM D 698 Clay Greater than -2 to +2 98% of ASTM D 698 Gravel 15 feet -2 to +2 100% of ASTM D 698 The Contractor may be required
to add moisture to the excavation materials in the borrow area if, in the opinion of the Soils Engineer, it is not possible to obtain uniform moisture content by adding water on the
fill surface. The Contractor may be required to rake or disc the fill soils to provide uniform moisture content through the soils. The application of water to embankment materials shall
be made with any type of watering equipment approved by the Soils Engineer, which will give the desired results. Water jets from the spreader shall not be directed at the embankment
with such force that fill materials are washed out. Should too much water be added to any part of the fill, such that the material is too wet to permit the desired compaction from being
obtained, rolling and all work on that section of the fill shall be delayed until the material has been allowed to dry to the required moisture content. The Contractor will be permitted
to rework wet material in an approved manner to hasten its drying. 8. COMPACTION OF FILL AREAS Selected fill material shall be placed and mixed in evenly spread layers. After each fill
layer has been placed, it shall be uniformly compacted to not less HRL COMPLIANCE SOLUTIONS, INC. SOURCE GAS SPRING VALLEY COMPRESSOR STATION PROJECT NO. GS05724·115 S:\GS05724.000\115'12,
Repor1Ii\GS05724115 Rl.doc 8-2
than the specified percentage of maximum density. Fill shall be compacted to the criteria above. At the option of the Soils Engineer, soils classifying as SW, GP, GC, or GM may be compacted
to 70 percent relative density for cohesionless sand soils. Fill materials shall be placed such that the thickness of loose materials does not exceed 12 inches and the compacted lift
thickness does not exceed 6 inches. Compaction as specified above shall be obtained by the use of sheepsfoot rollers, multiple-wheel pneumatic-tired rollers, or other equipment approved
by the Engineer for soils classifying as CL, CL-ML, CH, or SC. Granular fill shall be compacted using vibratory equipment or other equipment approved by the Soils Engineer. Compaction
shall be accomplished while the fill material is at the specified moisture content. Compaction of each layer shall be continuous over the entire area. Compaction equipment shall make
sufficient trips to ensure that the required density is obtained. 9. COMPACTION OF SLOPES Fill slopes shall be compacted by means of sheepsfoot rollers or other suitable equipment. Compaction
operations shall be continued until slopes are stable, but not too dense for planting, and there is not appreciable amount of loose soils on the slopes. Compaction of slopes may be done
progressively in increments of three to five feet (3' to 5') in height or after the fill is brought to its total height. Permanent fill slopes shall not exceed 2.5: 1 (horizontal to
vertical). 10. PLACEMENT OF FILL ON NATURAL SLOPES Where natural slopes are steeper than 20 percent in grade and the placement of fill is required, benches shall be cut at the rate of
one bench for each 5 feet in height (minimum of two benches). Benches shall be at least 10 feet in width. Larger bench widths may be required by the Engineer. Fill shall be placed on
completed benches as outlined within this specification. 11. DENSITY TESTS Field density tests shall be made by the Soils Engineer at locations and depths of their choosing. Where sheepsfoot
rollers are used, the soil may be disturbed to a depth of several inches. Density tests shall be taken in compacted material below the disturbed surface. When density tests indicate
that the density or moisture content of any layer of fill or portion thereof is not within specification, the particular layer or portion shall be reworked until the required density
or moisture content has been achieved. HAL COMPLIANCE SOLUTIONS, INC. SOURCE GAS SPRING VALLEY COMPRESSOR STATION PROJECT NO. GS05724·115 S:\GS05724.000\115\2. Reporte\GS1J5724 115 Al.doc
8-3
12. SEASONAL LIMITS No fill material shall be placed, spread or rolled while it is frozen, thawing, or during unfavorable weather conditions. When work is interrupted by heavy precipitation,
fill operations shall not be resumed until the Soils Engineer indicates that the moisture content and density of previously placed materials are as specified. 13. NOTICE REGARDING START
OF GRADING The Contractor shall submit notification to the Soils Engineer and Owner advising them of the start of grading operations at least three (3) days in advance of the starting
date. Notification shall also be submitted at least 3 days in advance of any resumption dates when grading operations have been stopped for any reason other than adverse weather conditions.
14. REPORTING OF FIELD DENSITY TESTS Density tests made by the Soils Engineer, as specified under "Density Tests" above, shall be submitted progressively to the Owner. Dry density, moisture
content, and percentage compaction shall be reported for each test taken. 15. DECLARATION REGARDING COMPLETED FILL The Soils Engineer shall provide a written declaration stating that
the site was filled with acceptable materials, and was placed in general accordance with the specifications. HRL COMPLIANCE SOI.UTIONS, INC. SOURCE GAS SPRING VALLEY COMPRESSOR STATION
PROJECT NO. GS05724·115 S:\GS[)5124.000\115\2. Reports\GS05724115 R1.doc B-4
DRAINAGE LETTER For: PROPOSED COMPRESSOR SITE -COUNTY RD. I 15 GARFIELD COUNTY, COLORADO PREPARED FOR: Redi Engineering Services, LLC 225 Union Blvd., Suite 500 Lakewood, CO 80228 PREPARED
BY: Sterling Design Associates, LLC 2009 West Littleton Blvd, #210 Littleton, CO 80120 Contact: Jay M. Newell, PE 303.794.4727 June 10,2013
June 10.2013 Redi Engineering Services. LLC 225 Union Blvd .. Suite 500 Lakewood. CO 80228 RE: Proposed Compressor Site -County Rd. 115 Garfield County, Colorado Drainage Letter To whom
it may concern: Introduction Please consider this letter the Drainage Report for the development of a compressor site located off County Rd. I 15 in Garfield County. Colorado. The compressor
site is located in the northeast one quarter of Section 3. Township 7 South. Range 88 West of the 6'" Principal Meridian. Garfield County. Colorado. approximately one mile east of the
intersection of County Rd. 115 and County Rd. 114. The project includes construction of an approximately 4.3 acre utility service facility and associated gravel. access road. The access
road will combine re-use of approximately 1.300 feet of a private existing agricultural access road and the construction of approximately 900 feet of new access road. A vicinity map
is included with this letter. The site is covered in native vegetation typical of the region. As determined from a review of soi ls information found on the USDA NRCS Web Soil Survey;
site soils include Empedaro loam. 6 to 12 percent slopes (35) along the west side of the site; Fughes stony loam. 3 to 12 percent slopes (48) along County Rd. 115 ; Morval-Tridell complex.
12 to 50 percent slopes (87) in the majority of the northern portions of the site; Showalter-Morval complex. 5 to 15 percent slopes (94) near the access road entrance off County Rd.
I 15; and Showalter-Morval complex. 15 to 25 percent slopes (95) in the majority of the southern portions of the site. Site soils in the northern. access road portion of the site are
predominantly classified as Hydrologic Soil Group B. Site soils in the southern. compressor site portion of the site are predominantly classified as Hydrologic Soil Group C. Additional
soils information is included with this letter. The existing site generally slopes from east to west. Slopes in the northern. access road portion of the site are approximately 3: I or
4: I. Slopes in the southern. compressor site portion of the site are approximately 4: I. There are no existing drainage facilities associated with the site. An existing. private irrigation
ditch follows the existing access road from its intersection with Coutny Rd. 115 in the north the 1.300 feet south to the beginning of the new access road. The irrigation ditch then
continues south Jay M. Newell, PE Wayne T. Sterling, RLA, LEED AP 2009 W. Littleton Blvd. #2 I 0 Littleton, CO 80 120 303.794.4727 www.Ste rlingDesignAssociates.com
along the alignment of the proposed access road. This irrigation ditch serves the property owner's field immediately west of the project site. A diversion at the intersection of the
existing access road and proposed access road directs water to a second private irrigation ditch approximately 40 to 100 feet west of the initial ditch. A second diversion at the extreme
south end of the project site diverts water similarly west. No permanent structur'es exist to assist in the diversion of irrigation water. Construction is intended to include piping
portions of the irrigation ditch impacted by the proposed access road and compressor site as well as the installation of more permanent, private diversion structures. Access easements
are in place for the proposed roads and facility. No previous drainage studies have been reviewed in association with this letter. The site lies within Zone D -areas of undetermined,
but possible, fiood hazards as shown on the FEMA FIRM for Garfield County, Colorado (Unincorporated Areas), Map Number 080205 1470 B, Map Revised: January 3, 1986. Drainage System Existing
drainage patterns convey site runoff as sheet fiow from a natively vegetated ridge immediately east of the site to the west, then across private agricultural land. USGS mapping indicates
intermittent drainage from this agricultural land and adjacent non·agricultural areas covered in native vegetation to Spring Valley, apprOXimately 1.5 miles to the west near the Colorado
Mountain College campus. Development of the compressor site and access road is intended to maintain the existing sheet fiow drainage patterns and avoid conveyance facilities which tend
to concentrate runoff into erosive velocities. The majority of runoff will continue to sheet fiow across undisturbed slopes above and below the site covered in native vegetation; or
across cut and fill slopes protected by temporary and permanent BMPs including permanent re-vegetation. Runoff from the basin immediately uphill of the compressor site will be collected
in a proposed swale at the base of the cut slope above the site and discharged to the south. Riprap protection at the swale discharge will protect the downstream slope from erosion and
dissipate energy to non·erosive velocities. A small ditch on the upstream side of the proposed access road along with associated small diameter culverts and check dams will be installed
to convey minor, nuisance runoff only and are not sized for speCific, larger storm events. Regular inspection and maintenance of the ditch, culverts, check dams, swale, riprap protection,
access road and compressor site are recommended as necessary to maintain proper functioning of the various drainage facilities and to mitigate potential erosion, sedimentation, and related
failures. Maintenance of the access road and site is the responsibility of the private land owner and/or any users the owner enters into maintenance agreements with. Drainage Analysis
and Criteria Drainage analysis included with this letter is based on the Mesa County I City of Grand Junction SWMM and the Urban Drainage Flood Control District's Urban Storm Drainage
Criteria Manual. Calculations include references to specific equations, tables and figures used. Calculations for runoff coeffiCients, rainfall, time of concentration, and 2-year, 2S-year
and 100-year runoff are included with this letter. Swale design and riprap protection calculations are included as well. Jay M. Newell, PE Wayne T. Sterling, RLA, LEED AP 2009 W. littleton
Blvd . #210 Littleton. CO 80120 303.794.4727 www.SteriingDesignAssociat es.com
Conclusion The largely impervious nature and the relatively small area of the proposed improvements in relation to the surrounding undeveloped land and agriculturally developed land
should not significantly increase runoff from this site. The compressor site grading and proposed swale are intended to mitigate adverse effects due to storm water runoff to the proposed
facilities. A drainage plan is included with this letter. If you have any questions. please contact me by email or phone at jay@sterlingdesignassociates.com or (303) 794-4727 ext. 203.
Thank you. Jay M. Newell. PE On behalf of Sterling Design Associates. LLC Jay M. Newell, PE Wayne T. Sterling, RLA, LEED AP 2009 W. littleton Blvd . # 210 Littleton, CO 80120 303.794.4727
www.SterlingDesignAssociates.com
VICINITY MAP SITE~ E9 NORTH NOT TO SCALE
/3 '\j c APPROXIMATE SCALE IN FEET 1000 o 1000 E --< >---< ~ NATIONAL FLOOO INSURANCE PROGRAM FLOOD INSURANCE RATE MAP GARFIELD COUNTY, COLORADO (UNINCORPORATED AREAS) PANEL 1470 OF
1900 (SEE MAP INDEX FOR PANELS NOT PRINTI'O) CONNUNITY-PANEl NUNBER 0802051470 B MAP REVISED: JANUARY 3, 1986 Federal Emergency Management Agency nMs is an official copy of a portion
of the abo-.e referenced load map. It was extracted using F-MIT On-line. This map does not reneet changes or amendments which may have been made subsequent to the date on the title block.
For the latest product Information about Nation~ Flood Insurance Program ncod maps eheck the FEMA Flood Map Store at WNW.msc.ferml.gov
39' 29' 13' 39" 28' 44" Hydrologic Sot! Grou~Aspen·Gyps um Area, Colorado, Parts of Eagle, Garfield, and Pitkin Counties Map Scale: 1:.4,410 if pmtad on A slze (8.5" )1 11") sheet. N
A ~_~==:~ ___ ~~===~Meterli a 40 80 160 2-40 ~_~::===:,!~ ____ ~=====:!Feet o 150 300 600 900 USDA Natural Resources ." Conservation Service Web Soil Survey National Cooperative 5011
Survey 5/22/2013 Page 1 of 4 39' 29' 1"" 39' 28' 44'
\!&"" Hydrologic Soil GroufrAspen-Gypsum Area, Colorado, Parts of Eagle, Garfield, and Pitkin Counties MAP LEGEND Area of Interest (ADI) Area of Interest (ADI) Soils D Soil Map Units
Soil Ratings D A D IVD D B D BID D C D CID D D Not rated or not available Political Features • Cities Water Features ~ Streams and Canals Transportation ~ Rails ",.. Inter$late Highways
............ US Routes -:.::.:-Major Roads ~ Local Roads Natural Resources Conservation Service MAP INFORMATION Map Scale: 1 :4,4 10 if printed on A size (8.5~ )( 11~) sheet. The soil
surveys that comprise your AOI were mapped at 1 :24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding
of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely
on the bar scale on each map sheet for accurate map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: hHp:/fwebsoilsurvey.nrcs.usda.gov Coordinate
System: UTM Zone 13N NAD83 This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Aspen-Gypsum Area. Colorado. Parts of
Eagle. Garfield, and Pitkin Counties Survey Area Data: Version 5, Jun 9, 2008 Date(s) aerial images were photographed: 8/6/2005 The orthophoto or other base map on which the soil1ines
were compiled and digitized probably differs from the background imagery displayed on these maps. As a result. some minor shifting of map unit boundaries may be evident. Web Soil Survey
National Cooperative Soil Survey 512212013 Page 2 of 4
Hydrologic Soil Group--Aspen-Gypsum Area, Colorado, Parts of Eagle, Garfield, and Pitkin Counties Hydrologic Soil Group Hydrologic Soli Group-Summary by Map Unit -Aspen-Gypsum Area,
Colorado, Parts of Eagle. Garfield, and Pitkin Counties (C0655) Map unit symbol Map unit name Rating 35 Empedrado loam, 6 to 12 percent B slopes 48 Fughes stony loam, 3 to 12 percent
C slopes 87 Morval-Tridell complex, 12 to 50 B percent slopes 94 Showalter-Morval complex, 5 to 15 C percent slopes 95 Showalter-Morval complex, 15 to C 25 percent slopes Totals for
Area of Interest Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey Acres In AOI 4.0 1.5 15.2 0.4 25.0 46.2 Percent of AOI 8.7% 3.3% 32.8% 0.9% 54.3%
100.0% 5/22/2013 Page 30f4
Hydrologic Soil Group--Aspen-Gypsum Area, Colorado, Parts of Eagle, Garfield, and Pitkin Counties Description Hydrologic soil groups are based on estimates of runoff potential. Soils
are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration
storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (ND, BID, and C/D). The groups are defined as follows: Group A. Soils having
a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high
rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well
drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when
thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow
rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell
potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils
have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (ND, BID, or C/D), the first letter is for drained areas and the second is for undrained
areas. Only the soils that in their natural condition are in group D are assigned to dual classes. Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff: None
Specified Tie-break Rule: Higher Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 5/22/2013 Page 4 of 4
Runoff Coefficients Job Name: Garfield County Undeveloped -Historic flow analysis Streets -Gravel Roofs Hydrologic Basin Soil Group A B B B&C (assume C) C C D C Undeveloped 8.41 11.65
11.45 0.84 Streets Roofs (Gravel) Total 8.41 11.65 0.54 0.11 12.10 1.32 0.11 2.27 llmperviousness from Mesa County /City of Grand Junction SWMM, Table 701 % llmpervious 2% 40% 90% C2
-0.021 0.055 0.073 0.216 2Runoff Coeff C10 C25 0.165 0.26 0.262 0.38 0.275 0.39 0.375 0.47 2Runoff Coefficients from Mesa County I City of Grand Junction SWMM, Equations 711, 712, and
713; and Table 707 Note: If C is not greater than or equal to zero, it should be set to zero Date: 6/3/13 By: JMN % C100 Impervious 0.362 2% 0.51 2% 0.52 4% 0.57 28%
Rainfall Job Name: Garfield County Rainfall Depth-Duration.Frequency 2yr 6hr ::: 2yr 24hr = 2Syr 6hr = 2Syr 24hr = 100yr 6hr = 100yr 24hr = 0.9 inches 1.2 inches 1.6 inches 2.2 inches
2.0 inches 2.6 inches 1 Hour Rainfall Depth.Duration-Frequency Y2= Y25 = Yl00 = 0.65 inches 1.20 inches 1.66 inches Rainfall Depth-Duration-Frequency (inches) Duration (min.) 5 10 15
30 60 120 180 2 yr 0.19 0.29 0.37 0.51 0.65 0.73 0.79 Recurrence 25 yr 0.35 0.54 0.68 0.95 1.20 1.34 1.43 (Mesa County /Gily of Grand Junction SWMM, Figure 602) (Mesa County I City of
Grand Junction SWMM, Figure 608) (Mesa County I City of Grand Junction SWMM, Figure 605) (Mesa County I City of Grand Junction SWMM, Figure 611) (Mesa County /City of Grand Junction
SWMM, Figure 607) (Mesa County I City of Grand Junction SWMM, Figure 613) (Mesa County /City of Grand Junction SWMM, Equation 601) (Mesa County I City of Grand Junction SWMM, Equation
602) 100 yr 0.48 0.74 0.94 1.31 1.66 1.77 1.85 (From Mesa County I City of Grand Junction SWMM, Equations 603 and 604, and Table 603) Intensity.Duration·Frequency (in/hr) Recurrence
2 yr 25 yr 100 yr Duration (min.) 5 2.22 4.13 5.69 10 1.77 3.29 4.54 15 1.49 2.76 3.81 30 1.03 1.91 2.63 60 0.66 1.23 1.70 120 0.41 0.76 1.04 180 0.30 0.56 0.77 Date: 6/3/13 8y: JMN
Time of Concentration Job Name: Garfield County Sub-Basin Data Desig C5 (1) (2) A 0.08 B 0.16 C 0.18 '-D 0.30 Area Length Ac Ft (3) (4) 8.41 300 11.65 300 12.10 300 2.27 125 **lnitial/Overland
T;me (T;) Slope T; Length % Min Ft (5) (6) (7) 30.00 10.38 200 30.00 9.51 460 25.00 9.93 850 3.50 10.68 65 *Velocity from Mesa County I City of Grand Junction SWMM, Equation 703 and
Table 703 UTi calculated from Mesa Coutny /City of Grand Junction SWMM, Equation 702 Travel Time Tt Slope ·Vel Tt % FPS Min (8) (9) (10) 30.00 3.83 0.9 30.00 3.83 2.0 25.00 3.50 4.0
50.00 4.95 0.2 Dale Calculated by Tc Check Urbanized Basin Tot Len Tc Ft Min 111\ 112\ Final Tc Min 113\ 11.25 11.51 13.98 10.90 6/3/13 JMN Remarks
Stormwater Runoff Job Name: Garfield County Direct Runoff Design Area Am, Runoff To Point Desig (Ac) Coeff (min) A 8.41 0.00 11.25 B 11.65 0.06 11.51 C 12.10 0.07 13.98 D 2.27 0.22 10.90
I 0 To CA (inll1r) (dol (min) 0.00 1.70 0.00 0.64 1.69 1.09 0.89 1.55 1.37 0.49 1.72 0.84 Total Runoff Street Total I 0 Slope CA (inlhr) (efs) % Street Flow Date Calculated by· Pipe
Design Slope Flow % 613/13 JMN Pipe Size Length (Ft) Project DeSign Storm Travel Time 2-yr V.I Tt (fps) (min) Remarks
Stormwater Runoff Job Name: Garfield County Direct Runoff Design Affi' Area Runoff To Point DesiQ (Ac) Coeff (min) A 8,41 0.26 11.25 B 11.65 0.38 11.51 C 12.10 0.39 13.98 D 2.27 0.47
10.90 , Q CA (inlhr) {efs} 2.18 3.16 6.88 4.42 3.13 13.84 4.73 2.87 13.57 2.53 3.19 8.07 Total Runoff Street To Total , Q Slope Street (min) CA (mlhr) (cfs) % Flow Dale: Calculated by:
Pipe Design Slope Flow % 6/3f13 JMN Pipe Size PrOject Design Storm Travel Time Length (Ft) V,, (fps) 25-yr Tt (mm) Remarks
Stormwater Runoff Job Name: Garfield County Direct Runoff Design -"" -"" Runoff To Point Desig (Ac) Coeff (min) A 8.41 0.36 11.25 B 11.65 0.51 11.51 C 12.10 0.52 13.98 D 2.27 0.57 10.90
I Q CA (infhr) (cfs) 3,05 4.35 13.25 5.91 4.33 25.59 6.24 3.96 24.71 1.28 4.41 5,66 Total Runoff Street To Total I Q Slope Street (min) CA (inlhr) (efs) % Flow Dale: Calculated by: Pipe
Design Slope Flow % 613/13 JMN Pipe Size Project: Design Storm: 100-yr Travel Time Length V', Tt (Ft) (fps) (min) Remarks --
Swale Design Job Name: Garfield County Weir Flow Q= CBcw*L*H15 Q= 24.71 CBCW = 3 H= 2 L= 2.91 Riprap Protection Job Name: Garfield County Q= 24.71 W= 2.91 H= 2.00 Q/WH' 5 = 3.00 Q/WH0
5 = 6.00 YUH = 0.40 Riprap Size = Type L Expansion Factor = 3.50 YI= 0.80 AI = 8.24 Lp = 25.85 Lp max = 20.00 cfs ft ft cfs ft ft ft ft' ft ft (UDFCD USDCM Vol. II, Equation 80-18) (from
assumed YUH = 0.40) (for allowable velocity = 3 fUs) (UDFCD, Vol. 1, Figure MD-22) (UDFCD, Vol. 1, Figure MD-24) (UDFCD, Vol. 1, Equation MD-23) (UDFeD, Vol. 1, Equation MD-22) Date:
6/3/13 By: JMN Date: 6/3/13 By: JMN
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