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Page I of 2 <br /> Vicki McCartney [EH] <br /> From: Vicki McCartney [EH] <br /> Sent: Tuesday, April 29, 2008 9:30 AM <br /> To: 'Kirk Larson' <br /> Subject: RE: Site Reviews <br /> Kirk: <br /> 425 Larch Road is an MTBE site. The plume is not defined laterally. Two of the three monitoring wells installed <br /> in February 2007 are impacted. Interim remediation is needed to contain the plume. <br /> 1419 Charter Way is a site with one monitoring well (MW-2) impacted with high concentrations of gas, BTEX, <br /> and 1,2-DCA. There is an ozone injection system in operation and the consulting firm is recommending three <br /> additional sparge points. Our department has approved the installation of two new monitoring wells and the <br /> advancement of one CPT boring. <br /> 3400 Newton Road is a site where monitoring well MW-1 has had a history of being impacted with gas, BTEX, <br /> and MTBE. Groundwater is at approximately 62 feet and MW-1 is screened between 44 -64 feet below surface <br /> grade (bsg). As a result, groundwater is not available to be sampled each quarter. Our department has <br /> approved the installation of four new monitoring wells to delineate the groundwater plume laterally, and our <br /> department has approved a forty-eight-hour groundwater extraction pilot test. <br /> 1607 Turnpike is a site where our department has directed additional investigation to determine if a comingled <br /> plume exists between this site and the adjacent site located at 1601 Turnpike. The lateral extent of the <br /> petroleum hydrocarbon plume is undefined to the east and southeast of this site. Our department has also <br /> recommended a deep well be installed in the source area. A work plan is due to our department by June 5, <br /> 2008. <br /> 3230 North West Lane is a site with a municipal well located about 250 feet south of the site. Low <br /> concentrations of 1,2-DCA are present in the two deepest monitoring wells screened between approximately 60 <br /> and 70 feet bsg. In February 2008 three CPT borings (two on site and one off site) were advanced along with <br /> three borings to depths of five feet to collect soil gas samples. The results from this investigation have not been <br /> submitted yet. <br /> 3147 El Dorado Street is a site where the vertical extent of contamination in soil is defined in the source area <br /> but additional investigation is needed to define the dissolved petroleum-hydrocarbon plume south-southeast of <br /> the former USTs in the shallow zone. Our department is awaiting a work plan for this investigation as well as a <br /> work plan for a soil vapor extraction pilot test study. <br /> 983 Moffat Blvd. is a site that is in the process of being closed. In fact, the closure letter is being sent by <br /> our department today and GeoTracker will be updated at that time. <br /> Please let me know if you need additional information about any of these sites. <br /> Vicki McCartney, Senior REHS <br /> San Joaquin County <br /> Environmental Health Department <br /> 600 East Main Street <br /> Stockton, California 95202 <br /> Phone: (209) 468-9852 <br /> Fax: (209) 468-3433 <br /> 4/29/2008 <br />