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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> oA c <br /> � o <br /> Donna K. Heran, R.E.H.S. Unit Supervisors <br /> 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> Di <br /> rector <br /> r. Laurie A. Cotulla, R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. <br /> •' Douglas W. Wilson,R.E.H.S. <br /> :.p Program Telephone: (209)468-3420 <br /> �gProram Manager fFo:Ra� 1? Margaret Lagorio,R.E.H.S. <br /> Fax: (209) 464-0138 Robert McClellon, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Jeff Carruesco,R.E.H.S. <br /> FLAME MINI MART INC. JUN 2 2 2006 <br /> 1301.W KETTLEMAN LANE <br /> LODI CA 95242 <br /> RE: FLAME MINI MART INC SITE CODE: 1342 <br /> 1301 W KETTLEMAN LANE <br /> LODI CA 95242 <br /> San Joaquin County Environmental Health Department (EHD) is the lead agency <br /> providing the oversight of the-investigation and cleanup of releases from <br /> underground storage tanks (UST) within San Joaquin County. The above <br /> referenced site has been placed in the EHD Local Oversight Program as a result <br /> of the gasoline and methyl tert-butyl ether (MTBE) contamination found in soil <br /> and ground water at your site in 1998. <br /> EHD has reviewed the Soil Vapor Extraction Pilot Test Report April 2006 and the <br /> Quarterly Report-First Quarter 2006, prepared by Advanced GeoEnvironmental, <br /> Inc. (AGE). These reports include feasibility testing and ground water sample <br /> results for recent work completed. <br /> EHD has the following comments. <br /> 1. High concentrations of VOCs (12,000 ug/I) were documented in <br /> the soil-vapor samples collected during the pilot test. High <br /> concentrations were sustained for the duration of the 8-hour <br /> test. <br /> 2. The estimated effective radius of influence (vapor capture zone) <br /> during the pilot test was 42 feet. <br /> 3. The combine hydrocarbon mass removed in the 8-hour testing <br /> period was estimated at 11.64 pounds. <br /> 4. A significant increase in MTBE, TPH-gas, and BTEX were <br /> reported in MW-1 through MW-3 and MW-5 between the <br /> December 2005 and the March 2006 ground water monitoring <br /> and sampling periods. MTBE was reported at concentrations as <br /> high as 180,000 ugll in MW-2 (near the former USTs), up <br /> 100,000 ugll since the December 2005 event. The MTBE <br /> concentration in MW-5, the most down-gradient sampling/data <br /> point, had increased from 220 ug/I to 1,200 ug/l in that same <br /> period. <br /> A source of contamination from the unauthorized release discovered in 1998 has <br /> been evidenced in the former UST area. The pilot test conducted has <br />