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9 <br /> San Joaquin County DIRECTOR <br /> oD iN Donna Heran, REHS <br /> O.P• " ' • .0 Environmental Health Department ASSISTANT DIRECTOR <br /> .0 <br /> r. ` 600 East Main Street Laurie Cotulla, REHS <br /> Stockton , California 95202-3029 PROGRAM COORDINATORS <br /> dd LAICarl Bergman, REHS <br /> Mike Huggins, REHS, RDI <br /> cgZi—Pd01 P Website: www.sjgov. org/ehd 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 /> BILL STOERMER SEP 2 6 2007 <br /> FREMONT PLAZA INVESTMENTS LAWRENCE H BEASLEY <br /> 7015 MORTON COURT 2120 PEBBLE DRIVE <br /> STOCKTON CA 95205 ALAMO CA 94507 <br /> RE : Former Apache Plastics SITE CODE : 2313 <br /> 2050 Fremont Street <br /> Stockton CA 95209 <br /> San Joaquin County Environmental Health Department (SJC/EHD) has reviewed Feasibility <br /> and Site Assessment Study (Study) dated July 18, 2007 submitted on your behalf by <br /> Advanced GeoEnvironmental , Inc. (AGE) and has the following comments . <br /> In the Study AGE recommends the installation of two confirmation soil borings in the area <br /> targeted by soil vapor extraction remediation . In section 6. 1 . 2 AGE proposes to install five <br /> additional groundwater monitoring wells at the site, but describes the proposed locations of <br /> only four. Remedial alternatives and feasibility pilot tests are also discussed in the Study. <br /> SJC/EHD disagrees with AGE's conclusion that the area "from within 30 linear feet both east <br /> and west of the former UST area" is void of confirmation soil samples (Section 3. 3 Source <br /> Area Adsorbed Hydrocarbons) . Soil samples collected from boring MWA 3, located <br /> approximately 25 feet west of the former tank pit, and 15 feet west of MW-1 and 5-10 feet <br /> east of MP-1 , were non-detect in the vadose zone. Vadose zone soil samples collected from <br /> both MW-1 and MP- 1 were impacted . Soil samples from boring MP-2 and VEW-2/CB-1 were <br /> near non-detect in the vadose zone when they were installed (see figure 9). If a possible <br /> drilling location can be found near VEW- 1 , SJC/EHD would approve one confirmation soil <br /> sample near that point. <br /> SJC/EHD does not approve the proposed installation of monitoring wells west of MW-14 on <br /> the south side of Fremont Street. Before it was destroyed , sampling of shallow well MW-3 <br /> was intermittent from September 1989 thru February 2002; however, most reported <br /> analytical results from this well were non-detect. Positive results were reported in 1989 when <br /> the well was first installed , at one event in 1996 and again in 1999. Other reported results, in <br /> 1997 , 1998 and most recently in 2002 were reported non-detect for all analytes in the <br /> samples from this well . Additionally, all soil and grab groundwater samples from CPT boring <br /> CPT-3 and CPT- 12 were reported non-detect. <br /> SJC/EHD does not approve the proposed destruction of MW- 16 and MW-18 . <br /> SJC/EHD does not approve installation of dual phase extraction (DPE) wells at this time , or <br /> conducting a DPE test. Remedial activities at this site should focus on the groundwater <br /> contamination , which is relatively deep and not a likely candidate for remediation by DPE . <br />