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San Joaquin County DIRECTOR opGl V!N cDonna Heran, REHS oG Environmental Health Department ASSISTANT DIRECTOR 600,Eas# Main:Street Laurie Cotulla.REHS Stockton, Californiia,95202-3029 -'P-ROGRA'M COORDINATORS _rr� =Mike Huggins; REHS,RDl c : ''P • .M c aret La�drio R �S g.. EHS Website: WivW.sjyov.-.ordlm RdberfMcClellon;"REHS P_horie: (209)468-3420 Jeff Carnlesco;FfEHS;•RDI Fax: (209) 464-0138 Kasey Foley,REHS February 18, 2009 Michael Karvelot Quik Stop Market Inc. 4567 Enterprise Street Fremont, CA 94538 Subject: Quik Stop Station No. 976 1030 S. Olive Avenue Stockton, CA 95215 The San Joaquin County Environmental Health Department (EHD) has reviewed the data from the above subject site and the site at 4075 E. Main Street in Stockton and provides'the following comments. The underground storage tank (UST) system was removed from 4075 Main Street in December. 1998.. The soil beneath the UST's, dispensers 'and piping was contaminated, including piping_ samples 3 and 6 which were collected-about 50 feet from where -monitoring,well IAW was. installed afthe 4075 Main Street site. The soil samples.collected during installation of•MW3-.had. contamination from 30 feet to 70 feet. . Initially, there were high concentrations of contamination in"the groundwater samples from MW3. The UST system removals at the Olive Street site occurred in October 1998. The piping and dispensers were located above the UST's, so soil samples were only collected beneath the UST's. There was minor contamination in the soil samples from the south end of Tank 1. Four soil borings and a monitoring well have been drilled at this site and no soil contamination was reported in any of the soil samples collected and analyzed. Total petroleum hydrocarbons as gasoline (TPH-g) have been found in the groundwater samples from MW1, located on the 1030 Olive Street site. This well is about 75 feet from MW3 on the 4075 Main Street site. The water samples from MW3 on the 4075 Main Street site had high TPH-g concentrations in 1999. Since 2003 when MW1 was installed at 1030 Olive Street, of TPH- in the water samples from MW1 have been similar to those found the concentrations p 9 in the samples from MW3 at 4075 Main Street, except since November 2007 the concentrations in MW1 have decreased. Since there has been minimum soil contamination found at the 1030 Olive Street site and the concentrations of TPH-g in the groundwater have significantly decreased, the EHD discussed the site inform-station with the Central Valley Regional-Water Quality Control Board. Based on that discussion, the EHD directs that you proceed with submittal of a work plan by March 18, 2009, to perform a soil vapor investigation.