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PnR~1GON <br />CONSULTING GROUP <br />i ~ i <br />~~SERVICE, QUALITY, AND 1NNDVATIDN° <br />t10J Ock h~k CMVe, Suue 110 <br />F,rt Caliw, CA 80525 <br />Fl,wr (970)1771600 <br />Fu (970) 3771880 <br />vwvpeagon~gmm <br />DnviO M. Rnu, P.E., DEE <br />Scow A. RvrxFnwno, P.E <br />Bwcr Surtx, P.E <br />J,we; M. Txowa, P.E <br />Ba,~ c. woxox <br />SrfvFN A M,w6, P.E <br />AMr D. wFBFA, ELT. <br />Hrwlxm S. A~nuuux <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 />I. BACKGROUND <br />The subject facility is leased by Aggregate Industries -WCR, Inc. (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 />