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San Joaquin County DIRECTOR <br /> " Department Environmental Health DepDonna Heran, <br /> ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie cowua,REHS <br /> w. � Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> ' Carl Borgman,REHS <br /> Website: www.s19 9 ov.oT /ehd Mike Huggins,REHS,RDI <br /> cgifkoa`d�P <br /> Margaret Lagorio, REHS <br /> Phone: (209)468-3420 Robert McClellan,REHS <br /> Fax: (209) 464-0138 Jett Carruesco,REHS,RDI <br /> Kasey Foley,REHS <br /> January 30, 2008 <br /> Ms. Susan Oakden Mr. Victorio Aranda <br /> Richard Oakden Trust c/o Victor Aranda <br /> 1200 Watt Avenue 1618 Bennington Court <br /> Sacramento, CA 95864 Stockton, CA 95209 <br /> Subject: Former Electro Delta <br /> 821 South Wilson Way <br /> Stockton, CA <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed the "Soil <br /> Remediation Feasibility Study Report" (Report) dated January 9, 2008, prepared by Advanced <br /> GeoEnvironmental, Inc. (AGE) for the above referenced site and provides the following <br /> comments. <br /> The Report discusses excavation of the contaminated soil from the former underground storage <br /> tank (UST) area by using bucket type equipment with shoring the excavation area adjacent to <br /> the building and sidewalk, and excavation using large diameter auger equipment. In discussing <br /> the feasibility of excavation using the large diameter auger equipment, the Report stated that <br /> "significant impact to the ground water quality at the site" could occur from the "high volumes of <br /> alkaline Portland cement or sand with cement". The same clean fill material that can be used to <br /> fill an excavation created by bucket type equipment can be used to fill the large diameter auger <br /> holes, not just Portland cement or sand with cement. The Report stated that in using either <br /> type of equipment, the excavation would have to be moved 25 feet west of the overhead power <br /> lines that run parallel to the sidewalk. This would limit the area and amount of contaminated <br /> soil that could be removed. If this is the case, then EHD would concur that excavation of the <br /> contaminated soil is not feasible. <br /> The Report also discussed soil vapor extraction (SVE) as a treatment method for the <br /> contaminated soil. The Report states on page 6 that "soil above 20 feet in the vadoze zone <br /> consists of sand". This is not shown on the AGE cross section dated November 15, 2005, <br /> although the boring logs for soil borings B5 and B6, drilled in and near the former UST area, <br /> show clayey sand, sandy clay, or silty sand between 10 and 15 feet in the vadoze zone. The <br /> Report states on page 4 that SVE has been successfully employed at nearby sites, and on <br /> page 7, states that conditions at 1419 Charter Way and 632 S. EI Dorado Street in Stockton are <br /> similar to this site. SVE was only effective for about 6 to 12 months at these sites. The Report <br /> also states that soil remediation is required under the building. There was no vadoze zone soil <br /> contamination found in the soil from B4 or monitoring well MW3 that would support this <br /> statement. Soil samples from B6, less than 20 feet from the UST area, also had no vadoze <br /> zone soil contamination so the soil contamination appears to be limited to the former UST area. <br /> The Report recommends performing an SVE pilot test, the EHD concurs with this <br /> LOPX821 S WILSON WAV doc <br />