2004-03-02_REVISION - M1978056 - Laserfiche WebLink

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CG February 12, 2004 Mr. Brad Janes Varna Companies, Inc. S I20 Gage Street Frederick, Colorado 80516 Re: Soil Remediation Report and Treatment Plan Varna Companies, Inc. Durham Pit 117 ]431 E. 16`h Street Greeley, Colorado DMG Mine ID: M-1978-056 CGRS Project #: 1-135-9929ab Deaz Mr. Janes: ENVIRONMENTAL • CONSTRUCTION • COMPLIANCE ~'-J ~ d! As requested by the Colorado Division of Minerals and Geology (DMG), CGRS, Inc. (CGRS) has prepared this report documenting corrective actions taken by Varna Companies, Inc, (Vazra) to address diesel fuel impacted soil at the former fuel depot located in the central azea of the referenced site (Figure 1). The fuel depot location is in the Southeast '/o of the Northeast '/s of the Northwest Y< of Section 10, Township 5 North, Range 65 West of the 6"' Prime Meridian in Weld County, Colorado. During an inspection conducted by the DMG on November 11, 2003 it was noted that piping associated with the diesel fuel aboveground storage tank (AST) at the fuel depot had a slight leak. Discolored, contaminated soil was observed inside the AST secondary containment azea. Based on these observations, DMG requested that the extent of contamination be defined, verify whether groundwater has been affected, and provide a plan for proper disposal of the contaminated soil. It was also requested that details be provided on how leaks will be prevented and contaminated soil handled in the future. Following the DMG inspection, Varna took measures to repay the pipe leak and removed diesel fuel from the AST to a level below the fuel transfer pipe. On January 19, 2004 an estimated 100-gallons of residua! file] was pumped from the tank and the AST was removed from the fuel depot. The empty AST was placed in the bone yard~terage-,area-in-tho--seutheastarea-of--thc-site-and--is-not^seruice. -VisualinspecIiora-of.the-AST following removal revealed no appazent evidence of leakage from the tank. On January 19 and 20, 2004, Varna performed excavation activities to remove the impacted soil and to determine the extent of hydrocazbon contamination. Current fueling activities aze perfomred at the fueling station located in the southeast azea of the site. ASTs now used for fueling aze located in a secondary containment system of concrete construction designed to contain potential future leaks or spills and prevent impact to the environment. Soil Remediation Soil remediation and environmental assessment objectives on the project were based on the Colorado Department of Labor and Employment, Division of Oil and Public Safety (OPS), Petroleum Storage Tank Owner/Operator Guidance Document, February 1999 (Guidance Document). Between January 19 and 2Q 2004, excavation was conducted to remove the petroleum hydrocazbon impacted soil from the fuel depot azea. P.O. BOX 1489 FORT COLLINS, COLORADO 80522 PHONE: 970-493-7780 FAX: 970-493-7985