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P~1R~1G ON <br />CONSULTING GROUP <br />i ~ i _ <br />~~SERVICE, QUALITY, AND INNGVATIGN° <br />I l03 Oak Nk Ckrve, Suioe 110 <br />R-rt CdBv, CO 80615 <br />Pharc 1970) 3771600 <br />Paa (970)3771880 <br />wmw.peagon~gmm <br />Devm M. Rnu, P.E, DEE <br />Scow A Rorxwux0, P.E <br />Bwtce Sw'm, P.E <br />lwFS M. TOaus, P.E <br />B~ c. wol+ll. <br />s3~„ A MuuB, eE <br />Awr D. w~a, El.r. <br />Htw7'x¢8 S. Almm~uN <br />September 20, 2002 <br />Ms. Connie Davis <br />Aggregate Industries -WCR, Inc. <br />P. O. Box 337231 <br />Greeley, Colorado 80633 <br />RE: July 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 July 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, 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 />release was investigated by Aggregate Industries personnel beginning on May 1, 2001 and <br />ENVIRONMENTAL ENGINEERING AND GEOHYDROLOGY <br />