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<br />!.0 INTROD UCT/OrV <br />Southwestern Portland Ccmcnt Company (SWPC) retained GRIvt-Rocky Mountain, Inc. <br />(GRM) to prepare a design to recover free-phase petroleum hydrocarbons from the <br />subsurface in the vicinity of the AST system at the Southwestern Portland Ccmcnt facility <br />located in Lyons, Colorado. The recovery system incorporates dual phase extraction <br />technology to recover remaining free-phase product, promote biodegredation of trapped <br />residual product, and recover volatile soil vapors. <br />1. / S/TE DESCR/1'T/OrV <br />The SWPC facility is located in Lyons, Colorado approximately I mile southeast of the <br />junction between U.S. Ilighway 3C, and Stale Ilighway C>G. 'fhe SWPC AS"f system is <br />located in the southwestern portion of the facility, northeast of the vehicle maintenance <br />shop. Saint Vrain Creek is located appruxim:ucly 0.7 mile north of llte SWPC AS1' <br />systcnt. 'hhc facility slopes gouty to the cast and lies within the Saint Vrain Creek <br />lloodplain. Alluvial rlcposils underlying the site contain soils ranging from clay, silt, and <br />sand to gravel, cobbles, and boulders. Groundwater beneath the site flows to the cast- <br />norlhcast toward Saint Vrain Crcck. <br />l~hc ASl~ system currently includes one 20,000-gallon dicscl tank and one 10,000-gallon <br />gasoline lank within a bcrmcd area. A leaking 10,000-gallon dicscl tank system was <br />removed from the berated area in March 1996. The AST-system berm consists of a a- <br />foot high concrete wall surrounding the tanks and ahigh-density polyethylene (EIDPE) <br />membrane underlying the tanks. Located approximately 20 feet to the south of the <br />bcrmcd area is an AS"f dispenser island. A buried gasoline line and an aboveground <br />diesel line nm from the location of the ASTs to the dispenser island. <br />ERM-Rocky Mountain, Inc. 1 Printad on Recycled Paper <br />P:\ 1000\SWPC\9G 1019. t \Ilesign.Doc <br />