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November 13, 2002 <br />>RECEI~E® <br />Ms. Kate Pickford NOS ~ y 202 <br />Environmental Protection Specialist geology <br />Division of Minerals and Geology Minerals aad <br />1313 Sherman Street, Room 215 Division of <br />Denver, CO 80203 <br />Re: Permit No. M-1992-069 - 83`s Joint Venture Pit <br />TR-003 -Technical Revision re Diesel Fuel Release <br />Dear Kate: <br />AGGREGATE <br />INDUSTRIES <br />We are in receipt of your letter dated October 24, 2002 advising that the Division of Minerals and <br />Geology is not requiring Aggegate Industries to continue sampling of goundwater at the 83`d Joint <br />Venture Pit with regard to the diesel spill in 2001. This sampling was being conducted in accordance <br />with the technical revision submitted to DMG in response to your October 15, 2001 request that <br />Aggregate Industries address certain issues related to the spill in order to achieve the following goals: <br />• to ensure that no contaminated groundwater is ultimately discharged into the nearby Poudre River. <br />• to ensure that no contaminated groundwater migrates off the site. <br />• and to make certain that adequate practices are incorporated to assure that a similar incident does not <br />occur. <br />In addition to groundwater issues set forth for achieving these goals, DMG requested that "prior to the <br />cessation of dewatering activities, the remainder of contaminated soils will be excavated in order to avoid <br />contact with groundwater when the groundwater rebounds." The following response to this issue, <br />prepared by our consultant, Scott Rutherford of Paragon Consulting Group, was included in the technical <br />revision: <br />...observations regarding this issue are described below and are based on information contained in <br />Paragon's July 6, 2001 Soil and Groundwater Abatement Report. <br />Soil contamination is already in contact with the groundwater table. TEPH contamination <br />was observed at and below the water in the Bottom #1 soil sample collected near the source <br />area and TEPH contamination was observed in the "smear" zone away from the source area <br />in the West Wall North End and South Wall Middle soil samples. <br />• The TEPH concentrations observed in the West Wall North End, Bottom #1 and South Wall <br />Middle soil samples collected from the abatement excavation exceeded the TPH Threshold <br />established by the Division of Oil and Public Safety (OPS) of the Colorado Department of <br />Labor and Employment. The TPH Threshold is a soil standard applicable to assessment only <br />and is not applicable to remediation. The lateral and vertical extent of TEPH contamination <br />Aggregate Industries <br />Weat Central Reglon, Inc. <br />3605 South Teller Street <br />Lakewood, CO 80235 <br />Connie Nickle Davis, Support Services <br />P. O. Boz 337231, Greeleg CO 80633 <br />970-336-6526 Fax: 970-378b856 <br />Telephone: 303-985-1070 An Equal Opportunity Employer <br />