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HomeMy WebLinkAbout5.0 PC Memorandum 07.11.2001Memorandum To: Planning Commission CC: All Interested Parties From: Garfield County Planning Department Date: 07llll200l Re: Salzman Special Use Permit - Construction Waste Material Transfer Site On April 25e, 2001 Mid-Con Realty. LLC and Steve Salzman came before the Planning Commission requesting permission to develop a construction waste material transfer station. At that time the Plinning Commission continued the hearing to June 6ft, 2001 and requested additional information :::: on drainage and engineering, building design, truck and trafirc impacts, water qualiry and : :::: :, eilviron rlntal conc-erns, teigtn of sto.age ind lastly, lighting. At the June 6n hearing the applicants ::: , . : , ie steO that this hearing be further continued until July I I allowing additional time to complete the ........ . .... afoiementroned studies. The Planning Commission granted this request' ,,,, ,:,,,,,, Diainagerand Engineering: ,,,,,,, 1,1:;; ,, Att.run.of,witl be directed to the lined sump pond at the west edge of the property. To direct all ii, fiows to this point, understanding that the natural slope of the land is to the west, the applicant has re- ',":,,, .,,, designed,the site to accommodate an l8-inch benn completely surrounding the site and along the ...'.:::.. . . no*hagd south sides an l8-inch ditch will be dug. The sump pond, measuring 1.238 sq ft in size will '::",',"',"" U" n tti iined with a geosynthetic clay liner and large enough to handle all the material from a 100- yeat 24 hour slorm event. Building Design. The applicant has re-designed the site plan to include a building measuring 64 feet by 72 feet (4,608 sq ft total) and standing 35 feet high to enclose the cement pad on which the construction waste material will be deposited for separation. Maximum building height in the Commercial Limited zone is 35 feet and maximum lot coverage is 85 percent. The leased parcel that this facility will operate on is 0.41 acres or 17,860 ft sq therefore lot coverage will bejust at 25 percent ofthe entire leased parcel. Truck and Traffic Impacts: Washington Infrastructure Services, Inc. conducted a traftic analysis on this site for the proposed construction waste material transfer site (copy attached). The analysis was conducted on June l3n, 2001between the hours of 4:00 and 5:30 PM, because the facility will be in operation and the traffrc counts on the roadway will be the highest. The traffic volumes during this time period were 12l vehicles eastbound and 236 vehicles westbound. Traffic generated by this site is assumed to be two laborers and a small fleet of trucks. There is an assumed maximum of 20 truck trips per day involving these trucks and then 2 employee trips per day entering and exiting the site. It is also assumed that that 20 percent of the truck trips will be done July 11, 2001 during the peak PM hours, 90 percent of the trucks will to/from the east and l0 percent to/from the west. Based on the above assumption, there will be an estimated 2.8 percent increase in traffrc on CR 100. Therefore the engineer conducting the survey calculated that CR 100 would still provide C orD level of service and that the proposed faciliq, should have no impacts to traffic conditions on CR 100. Water Quality and Environmental Concerns: In 2000 Mid-Con Realty did test drills on this site and found ground water about 130 feet below the sgrface, In order to prevent potential contamination to groundwater the applicant has agreed to erect a building over the concrete pad, an agreement with source International, Inc. a hazardous materials handling firm located in Denver, CO. and to completely line the sump pond with a geosynthetic clayliner. The building should prevent loose material from be removed from the site by wind or rain. Source International, Inc., is qualified to handle and dispose ofhazardous material in an appropriate and legal manner. Again with the separation area being cover any hazardous material found can be stored inside until the disposal team arrives. While the building prevents construction material from leaving the site it also reduces ventilation. Staff therefore recommends a ventilation source inside thebuilding adequate to provide fresh air to the employees and further recommends that employee beprovided with some tlpe of safety breathing-apparatus. The sump pond is a critical step to protecting the envirorunent and groundwater from this operation.The applicant is building the pond to handle a 1OO-year 24-hour stoim. The pond will ,rr"urur. ,o*. 1,238 sq ft and be 7 feet deep. The bottorn of the pond will be lined with a geosynthetic clay liner that has an overlap of two feet where seams meet. Once this step is compleG th; GCL will receive alayer of granular bentonite which will then be covered with fill material, either soil or sand. The engineer that designed this system stated that, "overall, the combination of berms, ditches andlined collection sump should provide more than adequate protection against contamination of soil, surface or groundwater." Miscellaneous Concerns: Materials Storage: With the exception of wood and metals or steel products materials that have been separated forrerycling are moved offthe property in 2 to 3 days. It can take up to 2 weeks beforgthere is enoughrnetals and steel to send to a rerycling center and wood is gen"raily on site only I day. Lighting In the revised narrative the applicants states that the hours of operation could be a maximum of 7 days per week, 7AM to 6PM, but is likely to be considerably leis. Staffassumes that the 7 days per week, 7AM to 6PM would be to start the facility and then gradually taper off. While the applicant states the hours would probably be Iess during ihe winter rionths tighti woua be required ior anoperation starting at 7AM terminating at 6PM. There fore the conirn to have evening/security lightpointed in and down onto the property until an exact hours ofoperation can be established.