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CG December 6, 2005 Mr. Bead Janes Varna Companies, Inc. 8120 Gage Street Frederick, Colorado 80516 Re: Sor7 Remedia~tion Completion Report Varna Compruries, Inc. Durham Pit 117 1431 E.16'~ Strcet Greeley, Cole~rado DMG Mine DD: M-1978-056 CGRS Project #:1-135.9929ab Dear Mr. lanes: ENVIRONMENTAL • CONSTRUCTION • COMPLIANCE This report document:. results of the bioremediation treatment of petroleum contaminated soil that was excavated during the January 20, 2004, cleanup of the former fueling depot at the referenced Varna Companies, Ina (Varna), Durham Pit 117. As noted in the Soil ]Itemediation Report and Treatment Plan prepared by CGRS, Ina (CGRS), dated February 12, 2004, soul excavated from the former fueling depot was stockpiled on a concrete pad south of the truck scales. The estimated loose volume of soil stockpiled was approximately 430 cubic yards. Following the treatment phm guidelines, manure compost was blended into the stockpile at a 25 percent to 30 percent mixture. Since the concrete pad provided an existing barrier to prevein potential cross- contamination with mrderlying soil without disturbing another area of the properly, the soil stockpile remained on fhe con~caete pad in a suc- to eight foot mound throughout the treatment process. The treatme~ process inchrded turning and biend'mg the soil on a bi-weekly >n monthly basis utilizing on-site excavation equipment end applying water as needed to maintain adequate moisture. Between October 8, 2004, and November 9, 2005, CGRS conducted three. soil sampling events at six-month intervals to monitor the treatment progress. Each sampling event was performed by obtaining soil samples approximately 6 feet into the core of the pile with a hand auger at six random locations. The soil sample locations was on the southwest (SP-1), souH--central (SP-2), soutlreast (SP-3), noAheast (SP-4), north-central (~5P-5~ and noAhwest (SPfi) sides of the stockpile. Soil samples were submitted to Technology Laboratory, inc., in Fort Collins, Colorado, for analysis to determine concentrations of total petroleum hydrocarbon diesel range organics (1'PH-DRO). Laboratory analysis results are summarized in Table 1. Copies of the laboratory analysis reports and chainof-custody docmoemation are included in Attachment A. Review of Table 1 $husttates downward trends in TPH-DRO concentrations ova the gent period. Results of the November 9, 2005, soil sampling event show hydrocarbon concentrations were below the 500 mg/Kg target clearmp level. P.O. BOX 1489 FORT COLLINS, COLORADO 80522 PHONE: 97093-7780 FAX: 970-493-7986