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HomeMy WebLinkAbout2.0 Correspondence• • LAND DESIGN PARTNERSHIP 918 Cooper Avenue, Glenwood Springs, CO 81601 970-945-2246 / Fax 970-945-4066 rblist©quixnet.net TRANSMITTAL Date: February 21, 2008 To: Craig Richardson From: Ron Liston Project: Special Use Permit — Naugle / Tri -Sate Trucking Job #: 0604 TRANSMITTED BY: Hand Delivery XXXX Express Delivery Priority USP First Class USP 24"x 36" Revised Sopris Engineering drawings 11"x 17" Revised Sopris Engineering drawings Well Permit -65714 CDOT Access Permit FEB 2 1 2008 Craig: John Savage is in the process of recording the noise easement and will deliver the recording information to you when complete. Tri-State is working on a bond for the rehabilitation which should be available very soon. The Storm Water Management Plan is incorporated into Sopris' drawings and I believe everything else is operational oriented. Let me know if we are missing anything beyond the two items listed above. Ron Form No. GWS -25 APPLICANT OFFICE OF TH TATE ENGINEER COLORADO DI ION OF WATER RESOURCC 818 Centennial Bldg., 1313 Sherman St., Denver, Colorado 80203 (303) 866-3581 LIC WELL PERMIT NUMBER 65714 - F DIV. 5 WD 39 DES. BASIN MD HARRY NAUGLE C/O ZANCANELLA & ASSOCIATES IN PO BOX 1908 GLENWOOD SPRINGS, CO 81602- (970) 945-5700 CHANGE/EXPANSION OF USE OF AN EXISTING WELL APPROVED WELL LOCATION GARFIELD COUNTY SE 1/4 NW 1/4 Section 25 Township 6 S Range 95 W Sixth P.M. DISTANCES FROM SECTION LINES 2850 Ft. from South 2750 Ft. from East Section Line Section Line UTM COORDINATES (Meters,Zone:13,NAD83) Easting: Northing: ISSUANCE OF THIS PERMIT DOES NOT CONFER A WATER RIGHT CONDITIONS OF APPROVAL 1) This well shall be used in such a way as to cause no material injury to existing water rights. The issuance of this permit does not ensure that no injury will occur to another vested water right or preclude another owner of a vested water right from seeking relief in a civil court action. 2) The construction of this well shall be in compliance with the Water Well Construction Rules 2 CCR 402-2, unless approval of a variance has been granted by the State Board of Examiners of Water Well Construction and Pump Installation Contractors in accordance with Rule 18. 3) Approved pursuant to CRS 37-90-137(2) for the expansion of use of the existing well constructed under permit no. 254155, appropriating ground water tributary to the Colorado River, on the condition that the well shall be operated only when the West Divide Water Conservancy District's substitute water supply plan, approved by the State Engineer, is in effect, and when a water allotment contract between the well owner and the West Divide Water Conservancy District for the release of replacement water from Ruedi Reservoir is in effect, or under an approved plan for augmentation. WDWCD contract #061214TST(a). 4) The issuance of this permit cancels permit no. 254155. 5) The use of ground water from this well is limited to industrial (0.06 AF), tree watering (4.3 AF), commercial (0.07 AF) and transit losses (0.22 AF). All use of this well will be curtailed unless the water allotment contract or a plan for augmentation is in effect. 6) The pumping rate of this well shall not exceed 15 GPM. 7) The average annual amount of ground water to be appropriated shall not exceed 4.7 acre-foot (1,531,495 gallons). 8) The owner shall mark the well in a conspicuous place 'with well permit number(s), name of the aquifer, and court case number(s) as appropriate. The owner shall take necessary means and precautions to preserve these markings. 9) This well shall be constructed at least 600 feet from any existing well, completed in the same aquifer, that is not owned by the applicant. 10) This well shall be constructed not more than 200 feet from the location specified on this permit. 11) A totalizing flow meter must be installed on this well and maintained in good working order. Permanent records of all diversions must be maintained by the well owner (recorded at least annually) and submitted to the Division Engineer upon request. APPROVED CML Receipt No. 3615419 State Engineer By DATE ISSUED 05-09-2007 EXPIRATION DATE 05-09-2008 COLORADO DEPARTMENT OF TRANSPORTATION STATE HIGHWAY ACCESS CODE NOTICE TO PROCEED COOT Perini No. 306236 swSIMP 070A/081.190/L Local Jurisdiction Garfield County William Critton Sopris Engineering 502 Main Street, Suite A3 Carbondale, CO 81623 970-704-0311 Permittee(s): Applicant; Rhonda Naugle PO Box 829 Rifle, CO 81650 970-625-1139 The permittee is hereby authorized to proceed with access construction within state highway right-of-way in accordance with the above referenced State Highway Access Permit and this Notice to Proceed. This Notice to Proceed is valid only if the referenced Access Permit has not expired. Access Permits expire one year from date of issue if not under construction, or completed. Access Permits may be extended in accordance with Section 2.3(11)(d), of the Access Code. Adequate advance warning is required at all times during access construction, in conformance with the Manual on Uniform Traffic Control Devices for Streets and Highways. All construction shall be completed in an expeditious and safe manner and shall be finished within 45 days from initiation. The permittee or applicant shall notify the Department prior to commencing construction as indicated on the Access Permit. Both the Access Permit and this Notice To Proceed shall be available for review at the construction site. This Notice to Proceed is conditional. The following items shall be addressed prior to or during construction as propriate- None OEC TO4 �r 40- �� �T Fy 1i! �9�y •4 -vag22-" Municipality or County Approval (When the appropriate local authority retains issuing authority) By (X) Title Date This Notice is not valid until signed by a duty authorized representative of the Department Colorado Department of Transportation - sy - (X) Titre Access Manager Date January 4, 2007 Copy Distribution: Required 1. Region Pemi!t Flac 2 Staff Access Section. As needed: Local Authority, MTCE Patrol, Inspector Form 1265 8/98 ,stADO DEPARTMENT OFATION ,,TATE HIGHWAY AWESS PERMIT Perrot fee 100.00 Date of bansmilfai 11/03/2006 Region/Section/Patrol 03/02/09 CDOT Permit No. 306236 State Highway Hondo/Side 070A/081.190/L Local Jurisdiction Garfield Coun The Permittee(s); Applicant; Ref No. 06-242 Rhonda Naugle William Critton PO Box 829 Sopris Engineering Rifle, CO 81650 502 Main Street, Suite A3 970-625-1139 Carbondale, CO 81623 970-704-0311 is hereby granted permission to have an access to the state highway at the location noted below. The access shall be constructed. maintained and used in accordwmae with this permit, including the State lig hway Access Code and any attachments, terms, conditions and exhibits. This permit may be revoked by the issuing audiorty if at any time the penndled access and its use violate any parts of this permit. The issuing authority. the Department and their duly appointed agents and employees shall be held harmless against any action for personal injury or property damage sustained by reason of the exercise of the permit. Location: Located on 1-70 Frontage, a distance of 1000 feet east of RP 81, also known as 16605 Hwy 6. This access is north of 1-70 and at the very end of a frontage road. Access to Provide Service to: Industrial Part 50 DHV 100.00 % Other terms and conditions: * See Attached Pages 2 and 3 and Other Enclosures for Additional Terms and Conditions. MUNICIPALITY OR COUNTY APPROVAL Required only when the appropriate kcal authority retains issuing authority. BY (x) Dale Title Upon the signing of this permit the penmttee agrees to the terms and conditions and referenced attachments contained herein. M construction shall be completed in an expeditious and safe manner and shall be finished within 45 days from Initiation. The permitted access shall be completed in accordance with the terms and conditions of the permit prior to being used. The per nittee shall notify Brad Brophy with the Colorado Department of Transportation in Grand Junction at 970- 248-7360 at least 48 hours prior to commencing construction within the State Highway right-of-way. The person signing as the permittee mast be the owner or legal represerdafive of the property served by the permitted access and have full authority to accept the permit and is terms and condtions. - {x '� menti diii.Z1 Date , 3a ' a 6 This permit is not valid until signed by a duly authorized representative of the Department COL DEPAR OF TRANSPORTATION By Date (or issue) 1— V 07 Ttie j i 7 t' (x) ,, ,.Region 2Appicwd 3Staff Access Section Make copies as necessary for Local Authority Impactor fiTCE Patrol Traffic Engineer Previous editions are obsolete and may mot be used COOT Fenn clef tai • 1 • • STATE HIGHWAY ACCESS PERMIT 306236 SIP Located on 1-70 Frontage near RP 81.19 Left issued to Rhonda Naugle • November 3, 2006 TERMS AND CONDITIONS 1. This access is approved as constructed in accordance with Section 2.6(3) of the Access Code. 2. This permitted access is only for the use and purpose stated in the Application and Permit. This Permit is issued in accordance with the State Highway Access Code (2 CCR 601-1), and is based in part upon the information submitted by the Permittee. Any subsequent relocation, reconstruction, or modifications to the access or changes in the traffic volume or traffic nature using the access shall be requested for by means of a new application. Any changes causing non-compliance with the Access Code may render this permit void, requiring a new permit. 3. The traffic limitations listed on the face of this permit shall be adhered to. The traffic volumes are fisted in Design Hourly Volume (DHV) trips or Average Daily Trips (ADT) where entering the site and retuming counts as two trips, 4. Any mud or other material tracked or otherwise deposited on the roadway shall be removed daily or as ordered by the Department inspector. If mud is an obvious condition during site construction, it is recommended that the contractor build a Stabilized Construction Entrance or Scrubber Pad at the intended construction access to aid in the removal of mud and debris from vehicle tires. The details of the Stabilized Construction Entrance is found in the M & S Standards Pian No. M-208-1. -2- JOHN W. SAVAGE, P.C. Attomeyat Law January 14, 2008 201 Railroad Ave. P.O. Box 1926 Rifle, CO 81650-1926 970-625-1470; fax: 625-0803 email: SavageJW@rof.net REQUEST: Special Use Permit -Industrial Support Facilities APPLICANTS: Harry and Rhonda Naugle LOCATION: West of I-70 Rulison Interchange HEARING: Public Hearing on SUP January 14. 2008 APPLCANTS' PROPOSED CONDITIONS OF APPROVAL: Applicants request that the staff recommendation denying this application be disregarded and that the application be granted with the conditions suggested by staff, as modified by the following: Staff Recommendations (page 13 of Staff Report): (1)-(7) No change. NEW CONDITIONS: (8) Any disturbed areas of the site that remain unpaved, shall be maintained to limit dust generation to the extent possible using reasonable dust control measures and that the building permit application include a specific plan for implementing this requirement. (9) Applicant shall execute and record the attached Easement and provide a copy of the recorded document for inclusion in the permit file. C:\Documents and Settings\John Savage\My Documents\CLIENTS INACTIVE\Naugle\Applicant Conditions 080114.doc Revised: 1/14/2008 10:18:00 AM; printed: 01/14/08; 10:18 AM; Page 1 of 2 NOISE ENCROACHMENT EASEMENT Whereas, Harry and Rhonda Naugle, hereinafter called the Grantors, are the owners in fee of that certain parcel of land situated in the, County of Garfield, State of Colorado, more particularly described as follows: [insert full description of property to be covered by easement], hereinafter called "Grantors' property," and outlined on the attached map (Exhibit A); Now, therefore, in consideration of the sum of ONE Dollar and other good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged, the Grantors, for themselves, their heirs, administrators, executors, successors and assigns, do hereby grant, bargain, sell and convey unto owner and operator of adjacent property subject to Special Use Permit Application, hereinafter called the "Grantee", for the use and benefit of the Grantee, its successors and assigns, An unrestricted easement to allow sound levels of noise radiating from Grantees' property line at a distance of twenty-five fee or more therefrom in excess of the Residential levels pursuant to C.R.S. 25-12-103(1), up to a maximum of 80 db(A), to the same extent as if Grantors' property were classified "Industrial". In addition Grantors' agree to require any subsequent purchasers of Grantors' property to specifically acknowledge and accept this Easement. The existence of this easement shall be deemed to be a complete defense to any action by Grantors' or their successors and assigns against Grantees' and their successors and assigns to declare Grantees' noise generation in conformance herewith to be a public nuisance. and Grantors do hereby fully waive, remise and release any right or cause of action which they may now have or which they may have in the future against Grantee, its successors and assigns, due to such noise. To have and to hold said easement and right of way, and all rights appertaining thereto unto the Grantee, its successors and assigns, until said Special Use by Grantees' or its successors and assigns shall be abandoned and shall cease to be used for the purposes granted. And for the consideration hereinabove set forth, the Grantors, for themselves, their heirs, administrators, executors, successors and assigns, do hereby agree that the aforesaid covenants and agreements shall run with the land and shall continue to apply even if Grantors' own both parcels of property. In Witness Whereof, the Grantors have executed this grant on GRANTORS: Harry L. Naugle Date Rhonda Naugle Date STATE OF COLORADO, COUNTY OF GARFIELD) ss. The foregoing Easement grant was acknowledged before me on by Harry L. Naugle and Rhonda Naugle. Witness my hand and seal. My commission expires: (seal) Notary Public C:\Documents and Settings\John Savage\My Documents\CLIENTS INACTIVE\Naugle\Applicant Conditions 080114.doc Revised: 1/14/2008 10:18:00 AM; printed: 01/14/08; 10:18 AM; Page 2 of 2 April 25, 2007 Bill Critton Tri-State Trucking, Inc. P.O. Box 789 Vernal, UT 84078 Re: Supplemental Information and Response to Comments regarding the Proposed OWS Associated with the Tri-State Trucking facility Special Use Permit SE Job #: 26166.01 Dear Bill: Pursuant to comments contained in an email message from Jim Rada to Craig Richardson, dated April 19, 2007 this letter presents our response to comment No. 7 in regard to the Special Use Permit Application review for Parcel 3 of the Naugle Boundary Survey (in Rulison, Colorado) review. Our response to this comment provides additional design information applicable to Sopris Engineering's scope of work related to the onsite wastewater system (OWS) previously described in Sopris Engineering's report, dated October 20, 2006. This letter report presents our findings in regard to the feasibility of design and approval of an engineered Onsite Wastewater System (OWS) for the above referenced Site. Our design recommendations are based on current knowledge of the site, observation of the site conditions and information provided by others for use in supporting your application to Garfield County. Our design recommendations are feasible with respect to current conditions, water usage, setback issues and geotechnical considerations. Our recommendations are in accordance with Garfield County and the State of Colorado ISDS Regulations. We are including a detailed description of the system in this letter. Conclusions We have reviewed the existing site conditions and the existing commercial improvements. The area west of the proposed trucking facility has been evaluated for use as a treatment/absorption field area. Based on our findings we believe that the design and installation of an OWS system is feasible in accordance with Garfield County and the State of Colorado Regulations. The proposed system will handle the domestic wastewater from the Tri State Trucking, trucking service facility. Our design recommendations for an OWS include the installation of a 2000 - gallon concrete septic tank and a 500 gallon dosing tank equipped with a duplex pump biotube vault dosing assembly and associated piping and controls. The primary treated effluent will discharge to a mounded pressure dosed sand filter with gravel and pipe bed type distribution system. The sand filter treatment/absorption system will provide secondary treatment of wastewater with infiltration into the ground. The system will meet all required standards and setbacks for a mounded sand filter bed system. The mounded bed treatment system can be installed over imported pit run material and the native soils. The system will meet all required setbacks and be installed within the septic envelope indicated on the plan. Our design is outlined below and delineated on the attached site plan. 502 Main Street • Suite A3 • Carbondale, CO 81623 • (970) 704-0311 • Fax (970) 704-0313 SOPRIS ENGINEERING LLC civil consultants SE. JOB 26166.01 April 25, 2007 Page 3 The secondary treatment system will be a mounded sand filter bed with full pressure distribution. For a sand filter design we are assuming a treatment bed loading rate of 0.9 gallons per square foot per day. The infiltration of treated effluent through the basal area at the interface with the soil will be based on the average percolation rate of 160 mpi determined during the recent geotechnical evaluation. The treatment/absorption system will consist of a mounded sand filter bed installed over native soils with the possible placement of pit run material as needed below the minimum 2 foot layer of sand. The treatment/absorption envelope comprises approximately 5000 Square feet and will accommodate an approximate initial treatment surface area of 1632 S.F. with an underlying basal infiltrative area in excess of 3350 S.F. The mounded filter will be alternately pressure dosed over 4 zones through perforated pressure distribution pipes installed in gravel overlying the sand layer. Alternating dosing will be controlled through the duplex pumps and an automatic distributing valve. The pump assembly and dosing chamber will be installed in a single compartment 500 gallon dosing tank in series with the septic tank. The vault will utilize a maintainable effluent filter. The transport line from the dosing pump to the absorption field will be installed to allow the drain back of effluent to the dosing basin. The system will be designed to include all standard appurtenances typical of a pressure dosed mounded sand filter system and installed to meet all required setbacks and minimum horizontal separation distances. Below is a tabular summary of the mounded sand filter design based on the above reported design flows and percolation rates. Calculations Minimum Required Treatment Absorption Bed Layout Infiltration Basal area S.F. Design QD flowrate Load Rate sand filter treatment Treatment absorption Area L.F. per 3 S.F. Sand filter No. Zones per field L.F. per zone Sand filter Distribution laterals per zone Area per length filter zone Width Length perfor. laterals gpd gal/sf/day S.F. L.F. # L.F. # ft ft ft 1305 I 0.9 1500 500 4 125 4 31 12 28 Soil Infiltration Required Basal Area Infiltrative Surface Area Design QD gpd Average Percrate min/inch Infiltration Basal area S.F. Treatment Min. Area S.F. Design Area S.F. Sideslope to toe sand ft/ft Depth Sand Filter ft Design Basal Area S.F. 1305 160 3301 1500 1632. 0.28 2 3360 If you have any questions or need any additional information please give us a call. Sincerely, SOPRIS ENGINEERING Paul Rutledge Design'E gii eer May 2, 2007 Tri-State Trucking, Inc. Attn: Mr. Ron Liston 918 Cooper Avenue Glenwood Springs, CO 81601 Re: Tri-State Trucking - Noise Analysis Dear Mr. Liston: There are several items that require additional explanation or discussion relative They are: 1. The State of Colorado Noise Law, CRS 25-12-101 is receptor based physiological and psychological effect on human beings". Thus, when considering limits in CRS 25-12-103 are for residential property where there would applicable to intervening land that, for the most part, cannot be considered 2. The noise from a grouping of trucks parked with their engines idling or running doubling of the distance. Table 1 presents the measured and calculated noise levels at the location shown IN engineering dynamics e jincorporated Page 1 of 2 facility. adverse noise and not every noise such reduced (V) 970-945-2246 (Fax) 970-945-4066 rbist@quixnet.net EDI Job No. C3610 to the Tri-State Trucking "Excess noise often has an the effect of nose, the be receptors of the noise for residential usage. at any speed decreases with on Sound Exhibit map. Noise Levels Table 1 - Tri-State Trucking Measured Sound Level Calculated Sound Level Location Site 1, Existing Entrance, 228 ft. 64.5 to 56.5 dB(A) — Site 2, Midway along Fence Line 56.4 to 56.6 dB(A) — Site 3, Southern Corner, 601 ft. 51.7 to 52.9 dB(A) — 1232 ft. to northeast Naugle Residence — 42 dB(A) 451 ft to northeast Resource Zone District — 50.6 dB(A) The noise levels measured at Site 3, the southern most location, were affected by traffic noise from 1-70. The from the trucks would actually be several dB lower than the measured values. The maintenance shop is about 430 It. north of the Resource Zone District. Noise from maintenance equipment as from impact wrenches, which are the loudest noise sources in maintenance facilities will be confined and by the structure of the maintenance building. If you have any questions regarding this information, please contact me at our Englewood office. Sincerely, ENGINEERING DYNAMICS, INC. - `'° __ c.9 —e., a�-�Sf', 1 . ,% s'.'4. ---L-0-7--12-7.- / Howard N. McGregor, P.E. Senior Acoustical Engineer 3925 south kalamath street • englewood, colorado 80110 • 303.761.4367 • Fax 303.761.4379 10'1 We:;i Fourth Scree! P. 0. Boy.: 203 (970) 625-5461 Rifle. CO 816.50 BILL TC Tri-State Trucking P. O. Box 789 Vernal, UT 84078 ANNUAL INVOICE FOR 2007 12/19/2006 2859 CONTRACT # ACRE FEET RATE IDENTIFICATION 061214TST(a) 4.7 Out/Commercial DESCRIPTION OTY RATE AMOUNT Recording Fee Augmentation Water Contract Colorado River Augmentation Plan Assessment 4.7 4.7 10.00 180.00 55.00 10.00 846.00 258.50 nue Total $1,114.50 On any shared well non-payment of any portion of the fees due deems the whole contract cancelled. HEPWORTH - PAWLAK GEOTECHNICAL Ht -F «Iii -Par, lak C c ,technical, InL. .5 20 County Road 15-1 111i.r unod ~brine'. Colorado S1001 Ph,n,e: ` 7i.q4i- 0SS Fax: 970-945-S454 'mail: hr";-et,�rhr_'eotech.cum PRELIMINARY GEOLOGIC SITE ASSESSMENT HARRY NAUGLE PROPERTY RULISON EXIT AND I-70 GARFIELD COUNTY, COLORADO JOB NO. 106 0684 OCTOBER 31, 2006 PREPARED FOR: BILL CRITTON CIO TRI-STATE TRUCKING P.O. BOX 789 VERNAL, UTAH 84078 1'111.,.cr iO3-S41-7119 • Colorado r 19-613-556'_ • SilverthL me 70-46S-1 * 9 t • • TABLE OF CONTENTS PURPOSE AND SCOPE OF STUDY - 1 - PROPOSED DEVELOPMENT - 1 - SITE CONDITIONS - 2 - REGIONAL GEOLOGIC SETTING - 2 - PROJECT SITE GEOLOGY - 3 - GEOLOGIC SITE ASSESSMENT - 4 - ALLUVIAL FAN FLOODING - 4 - MOISTURE SENSITIVE FOUNDATION SOILS - 5 - ROCKFALL - 5 - EARTHQUAKE CONSIDERATIONS - 5 - RADIATION POTENTIAL - 6 - LIMITATIONS - 6 - REFERENCES -8- FIGURE 1 - INITIAL DEVELOPMENT PLAN FIGURE 2 - TRIBUTARY DRAINAGE BASINS AND ALLUVIAL FANS FIGURE 3 - GEOLOGICALLY YOUNG FAULTS AND LARGER HISTORIC EARTHQUAKES • • PURPOSE AND SCOPE OF STUDY This report presents the findings of a preliminary geologic site assessment for the Harry Naugle property, near Rulison, Garfield County, Colorado. The project site is located northwest of the Rulison Exit on Interstate Highway 70 about nine miles west of Rifle, see Figure 1. The purpose of this study was to evaluate the geologic conditions on the property and assess if the geology could present potential constraints and risks to industrial development of the property. The study was conducted according to our June 27, 2006 professional services agreement with Bill Critton. A field reconnaissance of the project site was made on October 28, 2006 to observe the geologic conditions. In addition, we have reviewed published regional geology studies and our previous work in the project area. Based on this information, a preliminary assessment of the potential influence of the geology on the proposed development was made. This report summarizes our findings and presents our conclusions and recommendations. PROPOSED DEVELOPMENT It is our understanding that Tri -States Trucking is considering the 53 acre Harry Naugle property for industrial development. The initially proposed development will be facilities for Tri -States Trucking operations. These facilities will cover about eight acres in the eastern part of the property, see Figure 1. The trucking operations facilities will include a 6,800 square foot, truck maintenance shop with provisions for a shop expansion to the east and a truck wash to the west. Other facilities are a truck parking area, employee parking area and storage areas with provisions of expansion of these areas. Grading plans showing the extent of grading needed for trucking operations facilities were not available at the time of this study. In addition to the initial development described above, it is possible that in the future other industrial development may occur on the property. The type and locations of this future development were not available at the time of this study. Job No. 106 0684 Gtech SITE CONDITIONS The 53 acre Harry Naugle property is located northwest of the Rulison Exit on Interstate Highway 70 about nine miles west of Rifle. The property is on the floor of the Colorado River valley and lies about 1,100 feet to the north of the river. The property is about 25 feet higher than the river. The southern flank of the Roan Plateau forms the northern Colorado River valley side to the north of the project area and the northern flank of Battlement Mesa forms the southern valley side. The general topography on the property is shown by the contour lines on Figure 1. The property is on several coalescing alluvial fans. The larger fans in the area have drainage basins that head on the top of the Roan Plateau near the top of the Roan Cliffs see Figure 2. Relief between the Larger fan heads and the top of the drainage basins is about 3,200 feet. Five alluvial fans merge on the property. The fan surfaces in this area have average slopes of about 5 percent. The maximum elevation difference across the initial development area is about 20 feet. An existing natural gas well is located in the southeastern part of the property and several new gas exploration wells were being drilled in the Rulison area at the time of this study. Vegetation consists of scattered sage and other brush. REGIONAL GEOLOGIC SETTING The project site is located in the eastern part of the Colorado Plateau geomorphic province, see Figure 3. This part of the Colorado Plateau is underlain by the Piceance basin. The Piceance basin is a first -order geologic structure that covers much of northwestern Colorado. It developed during the Laramide orogeny about 40 to 80 million years ago. The modern topography in the region formed during about the past 10 million years as the result of erosion along the Colorado River and its tributaries. This erosion has deeply dissected the Piceance basin in the project area. The near surface rock formations in the project area were deposited at the close of the Laramide orogeny and following the Laramide orogeny. In descending stratigraphic order, they are Eocene -age Uinta Formation that is located on the top of the Roan Plateau and Battlement Mesa. The Uinta is underlain by the Eocene -age Green River Formation that crops out on the upper flanks of the Roan Plateau and Battlement Mesa. The Eocene- and Paleocene -age, Job No. 106 0684 Gec�tech • • -3- Wasatch Formation crops out on the lower flanks of the Roan Plateau and Battlement Mesa and is present below the surficial soil deposits across the Colorado River valley floor in the project area. Structural contours drawn at the top of the Mahogany oil shale bed in the Green River Formation indicate the post-Laramide formation rocks in the project area strike nearly north -south and dip less than 1 degree to the west (O'Sullivan, 1986 and Yeend and Others, 1988). Geologically young faults are not present in the project vicinity, see Figure 3. The closest geologically young faults, considered capable of generating large earthquakes, are in the Rio Grand rift that is located to the east of the project area. The closest Rio Grand rift faults are the Williams Fork Mountains fault (Fault Q50) located about 91 miles to the northeast and the southern section of the Sawatch fault (Fault Q56b) located about 100 miles to the southeast (Widmann and Others, 1998). The geologically young, Roubideau Creek fault (Fault Q20) is located about 56 miles to the southwest on the Uncompagre Plateau. PROJECT SITE GEOLOGY The project site is located on five coalescing alluvial fans (Qf) that form the Colorado River valley floor to the north of the river, see Figure 2. The fans are the result of debris flows and floods associated with infrequent, large thunderstorms. The fans developed in post -glacial times, with in the past 15,000 years, and the fans are still potential sites of future debris flows and floods. The fan deposits consist of angular sandstone fragments from gravel- to boulder -size in a sandy clay matrix. The fan deposits are expected to be relatively deep and should extend well below potential foundation and site grading depths for the type of development proposed. Colorado River alluvium may underlie the fans at depths on the order of 25 feet, or the fans may rest on the Wasatch Formation. The Paleocene- and Eocene -age Wasatch Formation crops out on the steep valley side to the north of the project site and is present below the surficial soil deposits at the project site. The Wasatch is a varicolored shale and siltstone that is interbedded with lenticular, fine- to coarse-grained sandstone. Job No. 106 0684 Gtech GEOLOGIC SITE ASSESSMENT There are several conditions of a geologic nature that should be considered in project planning and design. These conditions, their potential risk and possible mitigations to reduce the risks are discussed below. ALLUVIAL FAN FLOODING The coalescing alluvial fans that have developed in the mouths of the five ephemeral drainage basins tributary to the project site are geologically young and potential sites of future debris flows and floods, see Figure 2. Future debris flows and floods would be triggered by flash flood runoff from infrequent, unusually intense thunderstorms centered over the five basins. As summarized on Figure 2, the drainage basins up slope of the fans range from about 12 to 1,365 acres and have Milton numbers greater than 0.4 which is indicative of basins that can produce both debris flows and floods. Debris floods typically have volumetric sediment concentrations between 20 and 45 percent and debris flows typically have volumetric sediment concentrations between 45 and 63 percent. These high sediment concentration flows behave differently than water flows, see Appendix A. Without long-term observations it is not possible to estimate statistical recurrence probabilities for major debris flows and floods at the project site with a high level of certainty. Major debris flows and floods at the project site probably have statistical return periods of 50 to 500 years, or possibly longer. A major debris flow or flood has the potential to damage buildings and other development facilities. If this risk is not acceptable then mitigation should be considered. Additional studies will be needed to develop appropriate parameters for the design debris flow and flood to be used in mitigation design. Possible mitigation concepts that may be feasible for the proposed Tri -States Trucking facilities will likely be: (1) a combination of deflection berms and channel improvements, or (2) direct protection of the maintenance shop. Deflection berms and channel improvements could be located on the property up slope of the development area and designed to direct the design flows around the development area. Option 2 would be direct building protection. It should be possible to provide a reasonable level of protection for the maintenance shop by flood proofing and Job No. 106 0684 Gtech • • -5- reinforcing the lower story of the building. Structurally weak parts of the building, such as doors and windows, should be located on building walls not exposed to direct flow impact. With direct building protection, deposition of mud and debris in the parking and storage areas would have to be accepted. The mitigation concepts discussed above are for the initially proposed Tri -States Trucking facilities as shown on Figure 1. Possible mitigation for future industrial development on the property is beyond the scope of this study. MOISTURE SENSITIVE FOUNDATION SOILS The alluvial fan deposits in the Rulison area are known to be moisture sensitive and can undergo severe settlement if the soils are deeply wetted after construction. Subsurface exploration and laboratory testing will be needed to assess the potential severity of moisture sensitive soils at the specific facilities sites. If moisture sensitive soils are present then mitigation will be needed to reduce the potential risks. Mitigation for severe conditions could be rigid mat foundation systems or deep foundations. ROCKFALL The proposed Tri -States Trucking facilities shown on Figure 1 are not in a potential rockfall area, but the northwestern part of the project site appears to be in a potential rockfall runout zone. Rockfall mitigation may be needed if future development is considered in the northwestern part of the property. EARTHQUAKE CONSIDERATIONS Historic earthquakes within 150 miles of the project site have typically been moderately strong with magnitudes less than M 5.5 and maximum epicentral Modified Mercalli Intensities less than VI, see Figure 3. The largest historic earthquake in the project region occurred in 1882. It was located in the northern Front Range and had a estimated magnitude of about M 6.2 and a maximum intensity of VII. Historic ground shaking at the project site does not appear to have exceeded Modified Mercalli Intensity VI Job No. 106 0684 Ge&ech (Kirkham and Rogers, 1985). Modified Mercalli Intensity VI ground shaking should be expected during a reasonable exposure time, but the probability of stronger ground shaking is low. Intensity VI ground shaking is felt by most people and causes general alarm, but results in negligible damage to structures of good design and construction. The maintenance shop should be designed to withstand moderately strong ground shaking with little or no damage and not to collapse under stronger ground shaking. The U. S. Geological Survey 2002 National Seismic Hazard Map indicates that a peak ground acceleration of 0.06g has a 10% exceedence probability for a 50 year exposure time at the project site (Frank] and Others, 2002). This corresponds to a statistical recurrence time of 475 years. The region is in the 1997 Uniform Building Code, Seismic Risk Zone 1. Based on our current understanding of the earthquake potential in this part of Colorado we see no reason to increase the previously accepted seismic risk zone for the region. RADIATION POTENTIAL The project site is not located on geologic deposits that would be expected to have high concentration of radioactive minerals. However, there is a potential that radon gas could be present in the area. It is difficult to assess future radon gas concentrations in buildings before the buildings are constructed. Testing for radon gas levels could be done when the shop building and other occupied structures have been completed. New buildings are often designed with provisions for ventilation of lower enclosed areas should post construction testing show unacceptable radon gas concentration. LIMITATIONS This study was conducted according to generally accepted engineering geology principles and practices in this area, at this time. We make no warranty either express or implied. The conclusions and recommendations submitted in this report are based on our field observations, published regional geologic studies by others, the proposed development and our experience in the area. This report has been prepared exclusively for our client for planning and preliminary design purposes. We are not responsible for technical interpretations by others of our information. Additional studies will be needed to evaluate debris flow and flood mitigation, rockfall mitigation if development is proposed in the Job No. 106 0684 Gtech northwestern part of the property and to assess the potential severity of moisture sensitive foundation soils. Respectfully submitted, HEPWORTH - PAWLAK GEOTECHNICAL, INC. Ralph G. Mock Engineering Geologist Reviewed by: Artel Steven L. Pawlak, P RGM/vad cc: Land Design Partnership — Attn: Ron Liston Job No. 106 0684 Gtech REFERENCES Frankl, A. D. and Others, 2002, Documentation for the 2002 Update of the National Seismic Hazard Maps: U. S. Geological Survey Open File Report 02-420. Kirkham, R. M. and Rogers, W. P., 1985, Colorado Earthquake Data and Interpretations 1867 to 1985: Colorado Geological Survey Bulletin 46. O'Sullivan, 1986, Preliminary Geology Map of the Anvil Points Quadrangle, Garfield County, Colorado: U. S. Geological Survey Map MF -1882. Tweto, O. and Others, 1978, Geology Map of the Leadville 1 °X 2 ° Quadrangle, Northwestern Colorado: U.S. Geological Survey Map I-999. USBR 1977, Design of Small Dams: U. S. Department of the Interior, Bureau of Reclamation, Washington D. C. Widmann B. L. and Others, 1998, Preliminary Quaternary Fault and Fold Map and Data Base of Colorado: Colorado Geological Survey Open File Report 98-8. Yeend, W. E. and Others, 1988, Geology Map of the Rulison Quadrangle, Garfield County, Colorado: U. S. Geological Survey Map MF -2060. Job No. 106 0684 Gegtech • 'kt17 • ; / :),F5C 106 0684 Gtech HEPWORTH-PAWLAK GEOTECHNICAL — o o o .0 SPE — E • 0•5 (138 8 z • 0 0 — Harry Naugle Property Initial Development Plan Figure 1 B1 B5 Intel Development Area' Explanation: Tributary Drainage: Drainage basins tributary to project site that are potential source areas for debris flows and floods. B1 Qf Young Alluvial Fans: Geologically young alluvial fans that are potential deposition areas for debris flows and floods. Contact: Approximate boundary of map units. Property Line 10 Qf ��e \N- ire .//'yrs RI* Qf Drainage Basin Milton Basin Area Number B1 1,365 ac. 0.45 B2 24 ac. 0.90 B3 29 ac. 0.94 B4 12 ac. 1.14 B5 1,038 ac. 0.47 0 2300 ft. Scale: 1 in. = 2300 ft. November 2006 106 0684 GCGStech HEPWORTH.PAWLAK GEOTECHNICAL Harry Naugle Property Tributary Drainage Basins and Alluvial Fans Figure 2 VI Wyoming 2 U O Walden r) Rangely C 0 E m` c Rio Blanco (Explosion) 1973 M M 5.7 Meeker Project Site. ❑ Rifle Rulison' (Explosion) 1969 M 5.3 S. Grand Hogback 1944 f1i O O Glenwood Springs V' Kremmling 7 E N. Front -:nge 1882 M 6.2 VII Eagle ❑ Vail_ 1988 5.5 Grand Junction VI ,Aspen Delta \Q56b Montrose ri 020 Cimarron Ridge Gunnison 1960 M 5.5 l C Salida Fort Collins ocky Mtn. Arsen 1962 to 1967 VI to VII M 3.2 to M 5.3 Great L Col Plains Ridgeway 1913 VI Lake City 1955 VI C) Cortez E Durango gosa Springs �-- C Alamosa Explanation: Post -Glacial Faults: Fault younger than about 15,000 years. Larger Historic Earthquakes: Earthquakes with maximum intensity greater than VI or magnitude greater than M 5.0 from 1867 to present. Nuclear Explosion: Large underground nuclear explosion for natural gas reservoir enhancement. Dulce 1966 M 5.1 VII Chama Q69b Q69c Walsenbl. 069d Historic Seismic Zones: Areas with historically high seismic activity. M Local, surface wave or body wave magnitude VI Modified Mercalli intensity References: Widmann and Others (1998) U. S. Geological Survey Earthquake Catalogs 0 Scale: 1 in. = 50 mi. 50 mi. 106 0684 GeCPtech HEPWORTH-PAWLAK GEOTECHNICAL Harry Naugle Propery Geologically Young Faults and Larger Historic Earthquakes Figure 3