SITE INFORMATION AND CORRESPONDENCE

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San Joaquin County DIRECTOR Environmental Health Department Donna Neran,RENS �o.•_ .c p ASSISTANT DIRECTOR 600 East Main Street Laurie Cotulla,RENS N :{ Stockton, California 95202-3029 PROGRAM COORDINATORS • Carl Bergman,REHS Website: www. ov.or /ehd Mike Huggins, REHS,RDI Wbits 4�]�o•g N� J9 9 Margaret Lagorio,REHS Phone: (209)468-3420 Robert McClellon,REHS Fax: (209) 464-0138 ,teff Carruesco, REHS,RDI Kasey Foley, REHS January 14, 2009 Mr. Michael Karvelot Quik Stop Markets Incorporated 4567 Enterprise Street Fremont, California 94538 Subject: Quik Stop Station No. 076 1030 South Olive Avenue Stockton, CA 95215 On January 8, 2009, Horizon Environmental Inc. (Horizon) contacted the San Joaquin County Environmental Health Department (EHD) by telephone and recommended the above-referenced site for closure consideration. Horizon supported the recommendation by stating that petroleum hydrocarbon contaminants had not been detected in any of the soil samples collected from four onsite soil borings (SBI, SB2, SB3, and MW-1). Horizon suggested that low concentrations of petroleum hydrocarbon contaminants detected in groundwater collected quarterly from monitoring well MW-1 may be coming from JAMAR Service (JAMAR) located adjacent to the above-reference site. Horizon requested the EHD review data from the neighboring JAMAR site before determining the necessary to perform additional work at the Quik Stop Station Number 076 (Quik Stop), as directed by the EHD by letter dated August 8, 2008. By email on January 8, 2009, Horizon requested deferral of the work plan submittals due to the EHD on January 9, 2009, until the EHD had completed the review process. It is Horizon's opinion that groundwater gradient along the west side of JAMAR is east to west and that petroleum hydrocarbon contaminants from the JAMAR site may be impacting groundwater at the Quik Stop site. Horizon also suggested a correlation between groundwater analytical data collected from MW-1 at the Quik Stop site and groundwater analytical data collected from MW5 at the JAMAR site. The EHD has reviewed boring logs, cross sections, analytical data and groundwater gradient maps for the JAMAR site located at 4075 East Main Street, Stockton, California. It is the opinion of the EHD that available data are not definitive for supporting or refuting Horizon's claims. This decision is based on the following: • Data do not exist to determine the groundwater gradient or flow direction beyond the western boundary of the JAMAR property. Depth-to-groundwater measurements are not available toward the west of monitoring wells MW3 and MWS to support groundwater gradient as illustrated in quarterly reports submitted for the JAMAR site. The EHD has concluded that contour lines projected beyond the JAMAR property are not supported by data and could just as easily be drawn in other orientations.