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r ` .~ ~ i I III III IIIIIIIIIIII 999 September, 2001 Connie Davis Aggregate Industries P.O. Box 3121 Greeley, CO 80633 11 y ~ ~tp`~` . ' Dear Ms. Davis, The Division conducted an inspection on September 20, 2001 at the 83rd Joint Venue Pit, located in Weld County at 4509 F Street, Greeley, Colorado in response to a report from ~DPHE~f that a diesel oil leak had occurred on [he site sometime between mid-March and the end of April of 2001. The operator has been working with CDPHE since the time of discovery of [he leak in order to comply with state regulations concerning remediation. Additional information conceming remediation was presented to the Division in the form of a report, Soil and Groundwater Abatement Report Aeereea[e Industries F Street Facility, 4509 F Street, Greeley, Colorado, composed by the Paragon Consulting Group, and documenting the remediation work completed at the site as of July 6, 2001. During the inspection of the 83`d Joint Venture Pit, certain inadequacies and concerns were identified by the Division. The incident involved an estimated 10,840 gallons of diesel fuel. At the time of the Paragon report, approximately 2,000 cubic yards of contaminated soil was excavated from the affected area and stockpiled on the site. According to Connie Davis, Aggr~gate Industries, who was present during the inspection, the contaminated soil stockpile was placed on some type of liner material. Ms. Davis did not know what type of liner was used. The contaminated soil is being incorporated into asphalt produced at the site. According to Ms. Davis, CDPHE approved this use of the contaminated soil. At the time of inspection, there was no sign of stained soil in the area that had been excavated. Please indicate what type of liner was used under the contaminated soil stockpile and whether any other containment procedures were used to prevent leaching of the diesel fuel from the contaminated soil into adjacent soil. 2. The abatement excavation pi[ was subsequently filled with material. Ms. Davis was unsure of [he exact location from which the fill material was obtained, but thought it was acquired from somewhere on the site, west of the excavation pit. Please confirm [he actual origin of the fill material. 3. The Paragon Report indicated that soil samples collected during abatement excavation indicated detectable levels of BTEX and TEPH along the northwest border (TEPH 4,399 • m Kg, toluene 2,422 µg/Kg, ethylbenzen~7,250 µg/Kg, and total xylenes 11,789 µg/Kg), alon_giF?e southeast border (TEPH 2,44_Qm g, toluene 307 µg/Kg, ethylbenzene 1,067 µ Kg, and total xylenes 1,868 µg/Kg)~nd"southeast of the AST location (TEPH 3,273 g/Kg~ ethylbenzene 606 µg/Kg, and total xylenes 1,153 µg/Kg) upon completion of the