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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 PRIVATE DRIVE — 1 PROPOSED BUILDING. _._ RE: ARCHITECTS PLANS. ®s J HIGHWAY82 PROPOSED BUILDING. RE: ARCHITECTS PLANS. 19226-SNOW STORAGE CALCULATIONS SITE PLOW AREA PLOWVOLVOL. ISM ICF1[11 STORAGE AREA ISFI STORAGE VOICFI 121 NET+/- (CFI ACCESS&PARKING 26,610 13305 12.026 36.226 22.923 (119 ASSUME 129SNOW STORM THAT COMPACTS DOWN TO 6' DEPTH 121-ASSUMEAVERAGE STORAGE DEPTH IS 3: GRAPHIC SCALE IN FEET 1IrrH=20 n. SITE NOTES: ,NO NNO,OVON CONT.. INTMVNL IS ONE 0/ FOOL SITE IMPROVEMENTS LEGEND • PRONO.TO WORM HUT I. .. m .nu SUMO EASCIIONT 811 Rnowwn2.Delow. Call e.tom 000 ma S OPRIS ENG:NEENING. Lit. CION CONSULTANTS I DRAWN NY CHECKED BY DATE: 02-21-2020 lab No. 19126 W • O ao0 U U m N F a Z Z 0� • cc _ • 0 O W E- U ce CI.a CO Ca G LIMITED IMPACT REVIEW OKIE REVISION ITU SITE IMPROVEMENTS PLAN . DRAWING NO. C-1.010 c0) 0 a) 0 B SITE IMPROVEMENTS LEGEND LON PAOPODEDToau �... ,.� PAGPOPm.APNALTPAvORNT EXISTING LEGEND =RHO AORTA. ExisTROCONTouNAINRDAL EAcERENT PACT. PRoPSR.DRE ex.. FINct SPOT ELEVATION LEGEND FFE• FLOOR ELEVATION Ll A MST. GRADE oWUNEM�E MANN EVATION TDc,TOP PSACK OFCEIE ...TN... DRAINNOEa5ENTO.OPE SPOT .VAION ENURE TOP OFOONGETEOT100.0R i vas PROPOSED BUILDING. RE: ARCHITECTS PLANS. PROPOSED FINISHED FLOOR EL= 613250' - ----ter —� `nun nALA _ _' 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. I GRACE LANDSGPE AND RARaGPE SURFACES AROUND BOLDING PERIMETER AS NEEDED TO PROVIDE NINEVE DRAINAGE AWAY FRW ENTERER NIRATOR TO VOL. GRADES ACROSS SITE TO FIGURE THAT. INSTALLATION OF THE GRAD. L DRAINAGE NPROLEMENTS ARE N COMALARECORD SHOULD WITHBE WO AWARE TMOF ANY OGSTINC GESIGN RADES T THAT nY MPME THEE CONSTRUCCTION THE N OFF GRADINGINAGE ANDANENGINEER OWN OF NPROVDAENTSS. 6. DOWNSPOUT FOR BUILDING ROOF DRAIN SYSTEM TO RECOOROINATED WIIHTHE ARC.. AND MECNNIGL ENGINEER S. OPERATE NTG�OR055Lu MCQIITGN NM UTTTHEE RIIORR OIOPER CERNTPROamn OWNER IINvxttEAGIMIYEIRaOPETHEcoxmAGTORSPAuNOT 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 CRIP RATE EATALL LADOWNSPOUT 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. -PROPOSED FINISHED FLOOR EL A 61R3.00' 141,6 EROSION CONTROL NOTES: 1. WNIRACroaREST MAMCD.FNI PGC+ICES1811P1,TO CONTROLERONON ANDNmNENTAT00OURWO CONSTRUCTION CONIMCTORb RESPONSELE FOR INSTALLATION AND MUNIENANCE OFNLTENWORARY EROSION CONTROL MEASURES. U. 065110E ITIE ENNN BYGINEER 1RCITY M1nwuTOPSOIL l ECOIRACRENTo0A6Anv OPERATIONS. OR COCBkMOMNLTIVGi UUAAIOOO STCON% AREORAT010 REDUCED TOTHE CON, GTNFACHON. L RAPS SHALL BE INSTALLED BErOREANYFARTH DL FDINOANONROWONIONACITSrtIFSCOMro10E S Ex0Foo6NCE s1eo6NYWATERFROM 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 IN 11.19m1 SILT FENCE DETAIL NOTES: +ITLT FENCE TO BE FASTENED SECURE,' TO FENCE POSTS PM HARE TES OR uvE. LTITER 0.OMTODE CTION.m;ECUR¢YTo fENCEVI1MTESSPACm EVER/ 21Hr TOP ANDMID SES ERR Rm BYRE OFRIDE0.0THAOeON EACH oiNmTxEYsWLDE BYSNRK0E AND RMEDA MNNIDANCESHAILBEITHEOWIDAN NEEDED AND MAIERAL REMOVED cL EITHEROPRITRETLTFwcE TIPOSTE, STEEL ENTER AN .10.RSIAPHNATIO TER0.0M-RllEA R.NIRAFlIDDN, TABEINMATIAONOPAPPRGVm mVAL. 811 Xmww6Rrubolow. Call mml. you my S ORRIS ENGINEERING, LAC Null CONSULTANTS DUNNED SY JPP LIMITED IMPACT REVIEW REVISION nnE GRADING & DRAINAGE PLAN DRAWING No. C-1.020 SIIPPRIWEN "FOWL aasswrmm�.Nowm�a— EXISTING LEGEND f 1 • uwRarwMa „„ I I PRIVATE DRIVE cwku`wm vi'roiui�uov°wax`�iOm - � — '. - vOnxa Pn•a.v .. ..xONOvwouwwmnmwROx aanxosmw.�ixmmROw. wwrORr.wN 0 PROPOSED BUILDING. RE: ARCHITECTS PLANS. COWNOTINEMORE COMM MEMO SIMMOWER ISNLINNIEELLMOVEEnu WV. OW POLE LIALTRIONEN EMT. OLEINIRE OWN. POWER POIL w.-mOFIRE NIEMEN MESINOWITR WIVE EIONIMMORD STOP UTILITY PLAN LEGEND — PROEMS MITA LINE PROM. POWER POLE IRMO. SIRE KNOWN. PROPOSE. WER VALVE IB Ea PROPOSEINIEMNIONE oPROPOS. MIEN. PRO r/"'�n m n,uwn HIGHWAY 82 SITE IMPROVEMENTS LEGEND PROMIEN W. OR NOM PROPOSED STORIMEWEA PROPOSED STORY MET PROMS. ErvLLR MINN° MINIM WINO PROPERI.R. GENERAL UTILITY NOTES: NOMNER°EEMI Tax vwnxEIMAN. OFEELNI MIME. IIIIMMCWERUCTON. \_/ RR. OSIER PROPOSED BUILDING. RE: ARCHITECTS PLANS. PROPOM VW ENR.E Nw.Ow loin- auzraras GRAPHIC SCALE 11UN FEET IR SHALLOW UTILITY NOTES: NM. PER LIMY INNEIDOWL.1.11... WWI TOPEKA W. WIMP ONE. WEER.9.111.11111. COWS.. NSW MED NSW ar=�eo.wnuwRRxxormeweRuwnunwex 811 yew.. below. Call Wore you me. S ORRIS ENOINEERINs,LLc I OINR CONSULTANTS I DESIGNED DRAWN ON OINKED BE DATE: 01-21.1e2e Me NO. 19E26 CC J W —J d CO CC cQ G 0 —J W LIMITED IMPACT REVIEW REVISION TIRE UTILITY PLAN 0RAwiNa NO. C-1.030