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<br />PnR11G ON <br />CONSULTING GROUP <br />i ~ i <br />°SERVICE, QUALITY, AND INNOVATION° <br />I IOJ Oak R`k Drivt 9uve 110 <br />Rx~ Cdlirm, CO 90525 <br />Pho,K. (97011771900 <br />Rz (970)17A1890 <br />www.w~aw~B.mm <br />Dnvio M. Rnu, P.E, DEE <br />$mrrA RvrxmwaH, P.E <br />Bacr Surtx, P.E <br />Inu¢ M. Txouns, P.E <br />BRAD C. WOHIFA <br />s,ev~,+A Muuk, P.E <br />AMx D. Wa+ex, ELT. <br />Hew'rxtx S. AluHwnx <br />May 1, 2002 <br />Ms. Connie Davis <br />Aggregate Industries -WCR, Inc. <br />P. O. Box 3121 <br />Greeley, Colorado 80633 <br />RE: April 2002 Quarterly Monitoring Report/Request for Site Closure <br />Aggregate Industries F Street Facility <br />4509 F Street <br />Greeley, Colorado <br />Project Number 1001018 <br />Dear Ms. Davis: <br />The purpose of this report is to summarize the results of the quarterly groundwater sampling <br />event performed at the site in April 2002. As requested, copies of this report were submitted <br />to the Colorado Division of Minerals and Geology (DMG), Colorado Department of Public <br />Health and Environment (CDPHE) and Weld County Department of Environmental Health. <br />The approximate location of the site is shown on Figures 1 and 2 which are attached to this <br />report. <br />1. BACKGROUND <br />The subject facility is leased by Aggregate Industries -WCR, Ina (Aggregate Industries) and <br />is used for the mining of aggregates and production of asphalt pavement. A 10,000-gallon <br />diesel-fuel above-ground storage tank (AST) was utilized at the site for the fueling of on-site <br />machinery and vehicles. During the reconciliation of the April 2001 inventory records for <br />the AST, it was discovered that a release had occurred from the diesel-fuel system. The <br />ENVIRONMENTAL ENGINEERING AND GEOHYDROLOGY <br />