SITE INFORMATION AND CORRESPONDENCE_CASE 1

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California ReVonal Water Quality Czfntrol Board,- Central Valley Region Winston H.Hickox Robert Schneider,Chair c Secretart✓'] �•� y for Gray Davis En Sacramento Main Office 1� Environmental ion entnl Internet Address: http://www.swrcb.ca.gov/rwgcb5 Governor Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 Phone(916)255-3000•FAX(916)255-3015 }.r 10 August 2001 N Karen Petryna Melinda Barbera Andrea Sanders c/o Equiva Services LLC 2520 Oakenshield Road 143 Little Quarry Road PO Box 7869 Davis, CA 95616 Gaithersburg, MD 20878 Burbank, CA 91510-7869 COMPLETION OF 73267 ORDER REQUIREMENTS, TOKAYSHELL, 420 WEST KETTLEMAN LANE, LODI, SANJOAQUIN COUNTY I reviewed the 25 June 2001 Site Investigation Report(Investigation Report) submitted by Cambria Environmental Technology, Incorporated(Cambria) for the subject site. The Investigation Report presents a summary of activities completed to define the extent of petroleum hydrocarbon and methyl tertiary butyl ether(MtBE) contamination in soil and groundwater at the subject site. In June 2000, MtBE was identified in on-site monitoring well MW-5 at a maximum concentration of 32.4 micrograms per liter(µg/1). The City of Lodi Well No.12 (Well 12), an active municipal well, is less than 100 feet downgradient of MW-5. Based on the lack of definition of petroleum hydrocarbons and MtBE in site soil and groundwater, the proximity to Well 12, and site accessibility issues, staff issued a California Water Code Section 13267 Order to Equiva Services LLC (Equiva), and property owners Ms. Barbera and Ms. Sanders on 11 December 2000 requiring submittal of a soil and groundwater investigation report. On 22 February 2001,Board staff met with Equiva, Equilon Enterprises LLC, and Cambria to discuss the requirements of the 11 December 2000 13267 Order. Staff agreed to a revised scope of work to define the vertical extent of groundwater contamination using cone penetrometer technology(CPT), and agreed not to recommend enforcement action if site access was secured by 5 March 2001. Cambria completed additional groundwater monitoring in March 2001, then completed soil and groundwater sampling in April 2001. Soil contamination was identified to a maximum depth of 35 feet near MW-5. Cambria concluded that the MtBE contamination originally identified in groundwater at monitoring well MW-5 was a result of smearing contaminated soils into first water at approximately 55 feet. The depth-discrete groundwater sample collected from CPT-2 at 88 to 92 feet, the next deeper water bearing interval, was non-detect for all constituents using EPA Method 8260B. Equiva submitted the Soil Remediation Workplan to the San Joaquin County Environmental Health Division (County) and the Regional Board on 30 July 2001. The plan of work recommends soil vapor California Environmental Protection Agency pRecycled Paper The energy challenge facing Caiifomia is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http:/iwww.swrcb.ca.gov/rwgcb5