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San Joaquin County DIRECTOR <br /> Donna Hers <br /> Environmental Health Department DIRECTOR" O� ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla, REHS <br /> N Stockton, California 95202-3029 <br /> 1 PROGRAM COORDINATORS <br /> Carl Borgman,REHS <br /> C"'t>--`=':<�P • Website: wwws OV.Of /ehd <br /> Mike Huggins, REHS, RDI <br /> 4(/FORd J5 g Margaret Lagorio,REHS <br /> Phone: (209)468-3420 Robert McClellon, REHS <br /> Fax: (209)464-0138 Jeff Carruesco, REHS, RDI <br /> Kasey Foley, REHS <br /> Mr. Christopher K- Eley SEP j 0 not <br /> Attorney at Law <br /> 343 E Main Street Ste. 710 <br /> Stockton, CA 95202 <br /> RE: Monitoring Well at 200 Beckman Road, Lodi, CA <br /> Dear Mr. Eley: <br /> The San Joaquin County Environmental Health Department (EHD) received a copy of a letter <br /> you wrote to Dianne Lundquist, at Conestoga-Rovers and Associates (CRA), dated May 24, <br /> 2007. In that letter, you explained that you represent the San Joaquin County Mosquito and <br /> Vector Control District (MVCD), and the MVCD requests that the monitoring well located on <br /> the MVCD property, at 200 Beckman Road, Lodi, be destroyed. <br /> The EHD is the permitting agency for installation and destruction of wells and provides <br /> oversight of the investigation and remediation (corrective action) for sites contaminated from <br /> unauthorized releases from underground storage tanks (UST's) in San Joaquin County. The <br /> EHD has provided oversight of the corrective action for 880 Victor Road, Lodi, (adjacent to 200 <br /> Beckman Road) since December 1994, when UST's were removed from the former Shell Station <br /> and contamination was found. The monitoring well located on the referenced MVCD property <br /> (MWIO) was installed in July 2003 to investigate the southern extent of the groundwater <br /> contaminant plume emanating from the former Shell station. Fortunately, the groundwater <br /> samples from MW10 have been non-detect for the contaminants of concern, and the well <br /> currently provides a definition of the contaminant plume in that direction. <br /> During a discussion with Mr. John Stroh, MVCD Manager, in July 2005, I explained that <br /> destruction of MW 10 should not occur until another monitoring well was installed and shown to <br /> be non-detect for the contaminants of concern. This would then define the contaminant plume. <br /> In November 2005, Shell installed monitoring wells (MW 13 and MW 14) on the 880 Victor Road <br /> site, near the property line between the two parcels (map enclosed). Unfortunately, groundwater <br /> samples from these two wells contained and continue to show concentrations of Methyl-tert- <br /> Butyl Ether (MTBE) and Tert-Butyl Alcohol (TBA), and do not define the groundwater <br /> contaminant plume. <br /> During an environmental assessment for MVCD in October 2003, four temporary monitoring <br /> wells were placed on the 200 Beckman Road property. The groundwater sample collected from <br />