HomeMy WebLinkAboutEx 07 Sopris Engineering Report Pages 78-85IiIT7
TO
LIMITED IMPACT REVIEW
FOR STORAGE AND FABRICATION FACILITY
(Including Request for Subdivision Plat Amendment)
Parcel ID No. 2393-274-01-004
Page 078
Memorandum
To: Richard Neiley, Neiley Law Firm, LLC
From: John Petaisto, PE, Yancy Nichol, PE, Principal
Date: February 21, 2020
Re: Marble Storage / Fabrication Facility - Engineering Report
12744 Highway 82, Parcel C of the Dixon Subdivision
SE Project #19226
Sopris Engineering has prepared this memo to summarize the Civil Engineering aspects for the proposed Marble Storage /
Fabrication Facility located on Parcel C of the Dixon Subdivision (PID 239327401004). The proposed storage facility will be an
approximately 33,000 square foot single level structure, with asphalt parking/drive lanes, storm water mitigation infrastructure,
and installation of the necessary utilities to support the development. Below is a summary of the feasibility of the proposed site
improvements per the Garfield County Land Use and Development Code (LUDC)
7-204.E- Drainage and Erosion Control
The existing site topography generally slopes slightly from north to south and from east to west, with slopes ranging from 2-3%
according the survey completed by Sopris Engineering in 2018. An existing 12' high+/- modular block wall retains a steep hillside
on the north side of the development. This hillside extends to the existing Dixon Subdivision main access road just north of the
development site. The existing steep hillside extends to the east side of the property from the property/fence line to the existing
staging area associated with the historic nursery operations. There is an existing modular block retaining wall along the majority
of the southern property line allowing establishing a relatively flat site approximately 4' above the Colorado Department of
Transportation (CDOT) Right of Way to the south.
The proposed building is anticipated to be built next to the existing hillside to the north. A proposed swale along the north side of
the building will collect runoff from the hillside to the north and divert drainage around the proposed structure. Positive drainage is
proposed to divert drainage away from the building. A series of inlets, open channel swales, and storm collection pipes are
anticipated to collect stormwater runoff from the development and convey the runoff to proposed onsite detention facilities. The
proposed detention facilities will be sized to detain the 2- and 25-year design storm to pre development levels. Based on the
impervious area shown, the project is estimated to require approximately 3,300 c.f. of detention. The storage volume will also
accommodate for the 100-year design storm event per the requirements of 7-204C of the LUDC. This volume of runoff will be
collected in an onsite detention basins or subsurface detention chambers. Please refer to the Drainage and Grading plan for
details, Civil plan sheet C3.0.
Disconnection of impervious areas will be utilized wherever possible to help reduce mobilized sediment. The proposed detention
facility will be designed with a water quality treatment forebay meeting the requirements of 7-204C.3.d of the LUDC.
Temporary erosion control Best Management Practices will be during construction to prohibit mobilized sediment from leaving the
site during construction. A Colorado Department of Public Health and the Environment (CDPHE) permit for Stormwater
Discharges associated with Construction Activity will be obtained by the project's contractor as construction activity will impact
greater than 1 acre.
Detailed drainage design and stormwater detention calculations will be provided in support of any future Building Permit
application.
4-203.L- Traffic
The site is accessed from State Highway 82 from a shared existing access that serves the Dixon Subdivision. Refer to the
separate letter to the CDOT Access Management Unit in Grand Junction, Colorado, which updates the proposed traffic for the
access permit #319038. For this proposed Marble Storage / Fabrication Facility, the proposed traffic uses are reduced from the
current access permit traffic numbers.
502 Main Street • Suite A3 • Carbondale, CO 81623 • (970) 704-0311 • Fax (970) 704-0313
civil consultants
Page 079
Construction activity for the project is anticipated to be contained within the limits of Parcel C. No additional temporary roads or
access points are anticipated as part of the development's construction operations. No traffic impacts are anticipated to County
Roads as a result of the proposed improvements. Traffic impacts to Highway 82 resulting from construction are anticipated to be
associated with occasional material deliveries, gravel and concrete deliveries, and construction employee trips. Construction
traffic can be highly variable, but they are anticipated to be much lower than the existing access permit volumes.
Staging and storage of materials is anticipated to occur within the development area depicted on the Site Plan. Development
area may vary based on the means and methods of the project's contractor however activity is anticipated to be contained within
the eastern portion of the parcel Heavy truck traffic is anticipated primarily during the first few months of construction in the form
of material deliveries, concrete foundation and concrete slab construction. Additional truck traffic will occur during the
construction of project access aisles and parking in the form of road base, asphalt and concrete deliveries. No traffic impacts on
Highway 82 are anticipated during construction.
4-203.M- Water Supply and Distribution Plan
The existing property is served by the Tepoel Well located on Parcel A of the Dixon Subdivision. Please refer to Wright Water
Engineering plans and report for further information regarding physical and legal water supply as well as water quality analysis
results.
A water service distribution line is anticipated to be extended from the Tepoel Well south toward the development site on Parcel
C as depicted on the Site Improvements and Utility Plan. The water service line will extend to the fire suppression storage tank(s)
which will utilize an internal float to maintain minimum storage volumes. A separate waster distribution service line will branch
from the mainline once onsite and will extend directly to the building's mechanical room.
4.203.N- Wastewater Management and Distribution Plan
There is no municipal sewer service to the subject property. SE has performed preliminary calculations using assumptions for
the storage use with supporting office space. SE also reviewed the site soils report dated June 22, 2018 prepared by HP Kumar.
Based on the existing conditions, the installation of a site specific onsite wastewater treatment system (OWTS) to serve the
proposed development is feasible.
With input from the design team, our assumptions include a total of 4 full time employees with 20 visitors per day. The two
buildings would combined have a total of four bathrooms with four lavatories and four water closets, along with 2 kitchenettes to
include a total of 2 sinks, 2 dishwashers and 2 refrigerators with ice makers.
Based on the information provided we have calculated the design flow maximum equals 300 gpd. We have assumed the soils
are a silty loam with a loading rate of 0.65 gpd/SF. Our preliminary OWTS system includes a two compartment septic tank with
filter and riser lids to the surface, with an OWTS field consisting of three 38 foot long gravity trenches for a rectangular envelope
of 38' long by 17' wide.
The OWTS field is anticipated to be located on the east side of the development and will meet County minimum setback
requirements The OWTS plan will account for existing and proposed site constraints in accordance with the current Garfield
County and CDPHE standards. A detailed OWTS design using the HP Kumar soils report and site observation will be provided in
support of any future Building Permit application.
7-107- Access and Roadways
The existing Dixon Subdivision has direct access to Highway 82, and an existing access permit #319038 from CDOT.
The existing private drive generally meets the standards of 7-107. It has an approximate 28' width to the projects entrance. The
surface is paved and has an approximate 2% grade from edge of existing Highway 82 pavement to the right of way, and
approximate 8.5% grade to the project's entrance thereafter. The existing asphalt apron has a deteriorated asphalt surface. The
access intersection will therefore be improved. The existing asphalt will be removed, any minor adjustments to surface grades
502 Main Street • Suite A3 • Carbondale, CO 81623 • (970) 704-0311 • Fax (970) 704-0313
civil consultants
Page 080
will be made, and the access will be repaved to a distance approximately 10-ft beyond the project's access to Parcel C. The
improved access would include 11-ft travel lanes and 6-ft shoulders to the project's access in accordance with Table 7-107
A new 50' onsite easement is proposed on the SGM Plat, which will replace the existing 30' dedicated ROW Easement within the
Dixon subdivision, in order to meet minimum County standards.
7-109- Fire Protection
The emergency vehicle ingress/egress as well as fire protection requirements will be met with this development. Based on
previous projects within rural areas of the Carbondale & Rural Fire Protection District, water storage for fire sprinklers and a dry
fire hydrant will be provided. The site has good ingress and egress from Highway 82 and onsite. A fire truck tumaround has
been provided on the west side of the site, and is also feasible on the east side as necessary. The final access and fire
protection requirements will be confirmed with the fire district prior to building permit.
We anticipate the building will be required to have a sprinkler fire suppression system and storage tank(s) to meet a 90 minute
fire storage duration. Buried fiberglass storage tank(s) are proposed beneath the asphalt on the west side to the proposed
structure. The proposed tank(s) will be filled from the existing Topeol well and contain an internal float to maintain storage
volume. A tank distribution line will feed a fire suppression pump sized to meet the requirements of the sprinkler layout and
minimum pressures. A dry hydrant will also be connected to the fire storage tank and will provide the Fire Department with
access to the storage tanks. A detailed fire suppression sprinkler design will be coordinated with the project's Mechanical
Engineer and the Carbondale & Rural Fire Protection District. The details will be provided in support of any future Building
Permit application.
Additional Information
Natural Gas
There is no natural gas service in the area according to recent discussions with Black Hills Energy Corporation. The development
will evaluate the usage of propane or electrically supplied boilers during the HVAC design at building permit.
Telephone
According to recent discussions with CenturyLink, the property is currently provided a 25 pair telephone service to an existing
phone pedestal #12744 on Parcel C of the subdivision near the Highway 82 access point. There is ample room within the
pedestal to support future redevelopment. There is no fiber optic service within the area.
Electric
An existing single phase overhead electric line encumbers the property in an east -west alignment across Lot A and Parcel D of
the subdivision within an existing 30-ft wide Holy Cross ROW Easement (Rec. #746592). Coordination with Holy Cross has taken
place to discuss the possibility of extending 3 phase power to the site. The conceptual site and utility plan depicts extending 3
phase overhead power to the site and installing a pad mounted transformer per the Holy Cross representative.
Cable
Comcast Cable does not currently serve the subdivision and does not have any existing infrastructure in the vicinity of the
property.
Irrigation
The site has an existing 10" diameter irrigation pipe that flows from east to west across the site. We understand the existing pipe
is in poor condition, and it will need to be relocated for the proposed building and site improvements. The site utility plan shows
the approximate location for this gravity flow pipe. The final details for this pipe will be coordinated with the ditch company prior
to building permit submittal.
502 Main Street • Suite A3 • Carbondale, CO 81623 • (970) 704-0311 • Fax (970) 704-0313
civil consultants
Page 081
Conclusion:
Based on the information presented above, the proposed Marble Storage / Fabrication Facility can be feasibly constructed and
supported by the site improvements should the project obtain Limited Impact Review approval from the Garfield County
Commissioner_
041,4
Yancy Nichd h °NAB. 0'r
Principal 444,000
502 Main Street • Suite A3 • Carbondale, CO 81623 • (970) 704 -0311 • Fax (970) 704-0313
SOPRIS ENGINEERING • LLC
civil consultants
Page 082
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19226-SNOW STORAGE
CALCULATIONS
SITE PLOW AREA PLOWVOLVOL.
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GRADING & DRAINAGE NOTES:
1. EXITING CONTOURS LLN^TRATED RERUN ARENT I FTINRRVAL,Num ON SOPRN ENGINEERING R. TOPOCPFttPERFORAED IN NIB.
2 PROPOSED CONFOMAREAT I T PRIMALS.
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ENTERER
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COMALARECORD SHOULD WITHBE WO AWARE
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1. CONTRACTOR SHA.PROTECT ALL OUSTING TREESTRAT PRETO RERAN.
A. =CMCO COMPANIES FOR READ LOGNONS OF OMB PRIOR TO O, MAY NOT REPRESENT ACTUAL Fl. NITIONS. R NSTRUCTION THE RFSPON�LMOF THE CONTRACTOR TO CONTACT ALL
NLGEOIECNNXALNECOwAFNDATWNS MUST BE ADHERED TO.
10. ALL SITE RETAINING WALK BY OTHERS.
11. AIL STOW PIPES
SWILL.R.T BE GASKNED PVC6 OR AS NOTED ON RANS. PIPE LENGTHS ARE MEASURED FROM COMER OF STRUCTURE To
LINTER OF
1z wviDEACTO EA'NeRa,7mmIFRSMEEAND
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LOCATIONS AND AMINNWOFISO FT.IF NI. ARE NOT PROVIDED. CRATE
iS. ALL INLETS,TRENCH DRAINS AND RASING WIHmTxE OMBVAY SHALL BETRAFFE RATED PER MANUFACTURERS REOUNEMENTE
11. INSTALL RODENT SCREW AND OUTFNI PROTECTION AT THE OUTFALL OF ALL DRAIN USE:
+T. CONTRACTOR TO ADHEIETO ALL MANUFACTURERS INTALLATON RE NMENDATIONs.
IL HEAT TAPE SHALL BE PROVIDED TORALLDAYLIGMRPED AND RPEDTHRTAREBUNED LESS THAN AT FROMM/MS GRADE
HIGHWAY 82
PROPOSED BUILDING.
RE: ARCHITECT'S PLANS.
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EROSION CONTROL NOTES:
1. WNIRACroaREST MAMCD.FNI PGC+ICES1811P1,TO CONTROLERONON ANDNmNENTAT00OURWO CONSTRUCTION
CONIMCTORb RESPONSELE FOR INSTALLATION AND MUNIENANCE OFNLTENWORARY EROSION CONTROL MEASURES.
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OUNLRYSTRUCRON ACTIVITIES SHALL N.G..HAVE THE REASONABLE POTENTIAL TO GUNS OR ME0SURA&YCONTR¢UTETO AN
CONSTRUCTION SHAM. BE PHASED IN A MANNER TO 1631 EARN DISTURBING AMINES RE THE ENTIRE PROJECT SITE SHo10D NOT BE OLONRBED IF
CONSTRUCI1NVrt1 MAYBE 00[081E01N ONE PARTICULAR SECTION.
1. SEDNENIGUSED BYACCELERATED SOL EROSION SHNI.BERNWED FROM RUNOFFWATER BEFORE IT LEAVES THECONSTRUCIbN SITE
IL BUSES �MCEWUCTUREAND SmORAPE PETROLEUM PRODUCTS AA FROM MOTHER CHEMICALS SHALL NAVE SECONDARY COM MENT OR EOUNALOG PNOT.ION TO
TNE EROSION CONTROL PNN SI., BE CONTINWUNY MAHN TO.LECT NEW OR REVN"ED BEST MANAGEMENT PRACTICES OW. DUE TO CHANCES IN
DESIGN, CONSTRUCTION, OPERATIOx.OR MUNTEANCEOFTHE CONSTRUCMN ST E UPOAT£SNNST BEMADEWIMN R HOURS mLLdANCTHE CHANCE IN IMPS.
10. CONTRACTORTH21Al INSPECTTCONSTRUCTION SHE INCLUDING NL BM. STORAGE CONTAINERS. AND CONSTRUCTION EOUIWEYIAMNNW OFMCN D INNSANDW.N. HOURS AFTERAPREa ATTON EVENTOR SNOWMELT YG..URGamoaDN
t E CONTRACTOR SHALL NOMA RECORD OF ALL INSPECTIONS ON :WE AND AVALARTONTY E R REVIEW BY CO STAFF. IIGPECTION RETORTS MUTT IDENTIFY A
+ .0EIm OF NOINCOMRUNCEWRINNETEPoA:AND CONOMONS OF THE PEWS
IL STRAW...1.M SNN1 NOT BE USED FOR PRIMARY EROSION OR SEDISENT CONTROL RE STRAW SALES NAY BE USED FOR REDIFORLINIENT BEHIND ANOTHER MCP
SUCHASSLT FENCEL
ID. BPS INTENDED FOR SWEET FLOW SEDNEMRINOFF...REFucED PARALLEL TOTHESOPE
t4 ALL PANS SHALL BE CI.= WHEN SEONENTLEVOSAC INIATETO HALFTIME DESIGN GENEWP UNLESS OTHERAWESPEaIED.
15. AVEwuET 0Na 0(0300 D.0RSTADLOmm0 a STAG. SHALL BE PU AT FROM PREVENT TR.0N0ur0NT0rcsfEnz IF AV
CONTRACTORS... E.NEDATaY OWEIDTHETREETOFD®NO.
+0. ALL POMAPOIY STRUCTURES MUST RE RRALY SECURED WOH PAREOAR ANCHORS OR EWAL MUST BEP.ACE0 AWAY FROM ROW LINES OF STREET. VALES.
RAIN GARDENS ”WAY FROM BEETS.
EMATERIALB RUT BE MANAGED SO THAT STORPATER DOES NOT COME IN CONTACT.1TxE%SAND POTENTIALLY
WASH POLLUTANTS ORNTIE AT MINIMUM STOCNPAES 9NNL BE ROUTINELY WEE=ANNNR BGNNETED AS WELL AS INNUDE AN EROSION SOCK PERIMETER
BA WERTO PREIEMVAND EROSION AND SEDIMENT TRANSPORT OFmIfE KI STOCESTHATARE INACME FOR MORE THAN T OAYSWLL REQUIRE SOL BINDER OR
vE MUCLHANACH TNONIER AP.O.
te. ERORON CONTROLBGNNETS SMALL BE INSTALLED ONALL SLOPES ERCEED:NOLL
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SILT FENCE DETAIL
NOTES:
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