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San Joaquin County DIRECTOR <br /> ASSISTANT DIRECTOR <br /> Donna Heran, REHS <br /> Environmental Health Department <br /> �o.,•�:•�- •_.c� DIRECTOR <br /> 2 r .Z� 600 East Main Street Laurie Cotulla, REHS <br /> W Q Stockton, California 95202-3029 <br /> PROGRAM COORDINATORS <br /> / — — — — — - Carl Borgman, REHS <br /> or <br /> ovMike Huggins, RENS, RDI <br /> �q �,/ Website: www.sjg , g/ehd <br /> ��_F o�Ri 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 /> December 1, 2008 <br /> Aurangzeb (Zeb) Khan Dhillon Charan Singh Etal <br /> C/O Advanced GeoEnviron mental Inc 2057 S EI Dorado Street <br /> 837 Shaw Road Stockton CA 95206 <br /> Stockton CA 95212 <br /> RE: Quick N' Save #2 <br /> 2057 S. EI Dorado Street <br /> Stockton CA 95206 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed <br /> selected previously acquired site data, Additional Site Assessment Report (ASAR) dated <br /> June 27, 2007, and Quarterly Report — Second Quarter 2008 (OR) dated October 2, <br /> 2008, both reports prepared by your consultant Advanced GeoEnvironmental, Inc. <br /> (AGE), and the EHD comments as follows. <br /> During January 2007, seven soil probe borings (B-2 through B-8) were advanced to total <br /> depth of 35 feet below surface grade (bsg) to assess the lateral extent of soil and <br /> groundwater contamination-, the vertical extent of soil and groundwater contamination <br /> was not an objective in this investigation. In the ASAR, AGE concluded that the lateral <br /> extent of petroleum hydrocarbon-impacted soil was defined in all directions by B2, B3, <br /> B5, B6, B7, and B8 with no target analytes detected in the soil samples analyzed, and <br /> the vertical extent was defined by soil samples collected for extraction well boring EW-1 <br /> and boring B-1 at 50 feet bsg. AGE also concluded that the petroleum hydrocarbon- <br /> impacted ground water was undefined laterally by borings B3 and B4. The EHD concurs <br /> with AGE's conclusions with the possible exception of the vertical extent of methyl tert- <br /> butyl ether (MTBE). <br /> The EHD agrees with AGE that further investigation is needed to define the vertical and <br /> lateral extent of the impacted groundwater plume. The EHD concurs with AGE's <br /> proposed monitoring well locations as proposed in the ASAR. The EHD recommends <br /> that an additional monitoring well be installed near B7 to laterally delineate the impacted <br /> groundwater contamination plume cross-gradient toward the north. The proposed <br /> monitoring wells should be screened across the sand unit approximately 35 to 45 feet <br /> bsg which is a potential plume migration pathway. Also, the vertical extent of the <br /> groundwater plume should be investigated near the source area. <br /> The EHD letter dated March 23, 2007, directed that a workplan be submitted for <br /> installation of a groundwater extraction (GWE) system-, to date, the EHD has not <br /> received the workplan. Your consultant verbally informed the EHD on November 5, <br /> 2008, that the soil vapor extraction (SVE) system had not yet been installed pending <br /> completion of Pacific Gas and Electric utility connection. The EHD directs that the SVE <br /> system be installed and its operation initiated by February 2, 2009. Obtain all necessary <br /> 081201directive <br />