2001-11-13_REVISION - M1992069 - Laserfiche WebLink

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• III IIIIIIIIIIIII III • 999 ~~~.«~ ~- RECErvE~ October 30, 2001 NOV 13 2001 Olvlalon of Minerals and Ge01oBY Ms. Kate Pickford Environmental Protection Specialist Division of Minerals and Geology 1313 Sherman Street, Room 215 Denver, CO 80203 Re: Permit No. M-1992-069 - 83" Joint Venture Pit TR-003 -Technical Revision re Diesel Fuel Release Dear Kate: AGGREGATE INDUSTRIES In response to your request dated October I5, 2001, Aggregate Industries-WCR, Inc. submits this letter as a technical revision addressing each item noted in your letter, as follows: The following reports, prepared by Paragon Consulting Group, [nc. (Paragon) and previously submitted to you, address the abatement and assessment activities conducted to date to identify and monitor the presence of a groundwater plume. Soil and Groundwater Abatement Report, dated July 6, 2001 Site Characterzation Report, dated October 9, 2001 Based upon the recommendations of Paragon, an additional groundwater monitoring well was installed at the site on October 15, 2001. The initial groundwater sample from the newly installed well and the second quarterly groundwater samples from previously installed wells were collected on October 18, 2001. A sample was also collected from the dewatering trench at that time. According to the water analysis report of Technology Laboratory, Inc., a copy of which is enclosed, benzene- toluene-ethylbenzene-xylenes (BTEX) and total extractable petroleum hydrocarbons (TEPH) were not observed above their respective laboratory detection limits. Paragon also reported that free-phase product was not observed in the six (6) wells accessed during the October 18, 2001 sampling event. Paragon is in the process of preparing a Quarterly Monitoring Report regarding this most recent sampling event and a copy of that report will be submitted to you. Aggregate industries will continue groundwater monitoring for two additional quarters (January 2001 and April 2001), in accordance with the recommendations contained in Section 7 of Paragon's Site Characterization Report of October 9. Additionally, Aggregate Industries personnel will continue with visual oil and grease monitoring of the dewatering trench. Assessment activities completed to date appear to indicate that there is no significant diesel plume in the groundwater, however should a Aggregate Industries West Central Region, Inc. 3605 South Teller Street Lakewood, CO 80235 Connie Nickle Davis, Support Services P. O. Box 337231, Greeley, CO 80633 970.336.6526 Fax: 970-378b856 Telephone: 303-985-1070 An Equal Opportunity Employer