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� L <br /> San Joaquin County DIRECTOR <br /> Environmental Health De„artment Donna Heran, REHS <br /> '�p M ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla, REHS <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> • Carl Borgman, REHS <br /> Website: WWW.s ov.or eMike Huggins, REHS,RDI <br /> 4�/FORS jg / hd g Margaret Lagorio,REHS <br /> Phone: (209)468-3420 Robert McClellon,REHS <br /> Fax: (209)464-0138 ,teff Carruesco,REHS, RDI <br /> Kasey Foley,REHS <br /> October 27, 2008 <br /> Mr. Stephen Valentine <br /> Steve & Genes Service <br /> 6232 Hemet Avenue <br /> Stockton, CA 95207 <br /> Subject: Steve & Genes Service <br /> 2315 N. EI Dorado St. <br /> Stockton, CA 95204 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed <br /> correspondence (revised WP) dated March 18, 2008, submitted on your behalf by <br /> Geological Technics, Inc. (GTI) in response to the EHD correspondence dated March 7, <br /> 2008. The revised WP is a revision of the proposed Additional Site Characterization <br /> Work Plan (WP) dated December 7, 2007. The EHD has the following comments: <br /> In the revised WP, GTI proposes to advance soil boring SB-5 to a total depth of 80 feet <br /> below surface grade (bsg) to investigate the vertical extent of soil contamination at the <br /> source area and to install seven "intermediate" groundwater monitoring wells designated <br /> MW-110 through MW-116, screened from 65 to 75 feet bsg, to investigate "the extent of <br /> the groundwater plume to the northeast and southeast of the site" in the major sand unit <br /> between 60 and 80 feet bsg. The screen depths for the proposed monitoring wells, 65 to <br /> 75 feet bsg, appear to be targeting the major sand unit between 60 and 80 feet bsg. GTI <br /> notes in the revised WP that if no significant sand layers are encountered, then the 10- <br /> foot well screen for MW-110 through MW-113 will be placed at the same "interval" <br /> (approximate depth) as monitoring well MW-208 (discretely screened at 76 feet bsg) <br /> and, MW-114, MW-115, and MW-116 may not be installed. The construction of the wells <br /> will include a two-inch diameter schedule 40 PVC casing. GTI proposes that soil <br /> samples be collected and analyzed for the constituents of concern (COCs): total <br /> petroleum hydrocarbons quantified as gasoline (TPH-g), benzene, tolulene, ethyl <br /> benzene, and xylene (BTEX), methyl tert-butyl ether (MTBE), tert-amyl methyl ether <br /> (TAME), di-isopropyl ether (DIPE), ethyl tert-butyl ether (ETBE), tert-butyl alcohol (TBA) <br /> 1,2-dichloroethane (1,2-DCA) and ethylene dibromide (EDB). <br /> The soil samples collected from SB-5 will be taken at 5-foot intervals and analyzed for <br /> COCs from the surface to the base of the sand unit, which is expected to be <br /> encountered at 80 feet bsg. The monitoring well borings will be soil sampled every 5 feet <br /> from the surface to 75 feet bsg of which as many as 48 soil samples may be analyzed <br /> for CDCs including up to four samples from the "intermediate" zone and two soil <br /> samples from the "shallow" zone from MW-114 and MW-116. However, GTI does not <br /> identify the location of "intermediate" or "shallow" in the WP or revised WP. In <br /> Groundwater Monitoring 4th Quarter 2007 dated January 11, 2008, GTI describes <br /> "shallow wells" as being screened from 35 to 55 feet and "intermediate wells" as being <br /> screened from 43 to 70 feet bsg; therefore, the EHD interprets the depth intervals of <br /> 081027wpa <br />