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. is owned by the California Water Service Company (CWS) This well, designated by CWS as Station 7-02, is located on the west side of Sunnyside Avenue approximately 112 block south of Bradford Street in the City of Stockton, approximately 1,500 feet downgradient of former Thrifty Station#171 (Figure 1) On May 20, 2004, Thrifty spoke with Eric Marl of the CWS who indicated that the CWS does not release data regarding their wells, but he did state that as of June 2002, well 7-02 contained no detectable MTBE or other volatile organic compounds The nearest surface water body downgradient of the site is the Stockton Diverting Canal located over 1 5 miles to the northeast Mormon Slough is located approximately 1 0 miles to the southwest or upgradient of the site 6.0 POTENTIAL OFFSITE SOURCES During the site and well reconnaissance on May 18-19, 2004, Thrifty interviewed several residents in the area who indicated that gasoline stations previously existed on the southwest (1440 Harding Way) and northeast (15 02 North Wilson Way) corners of North Wilson Way and Harding Way to the north and west of Thrifty#171 Thnfty contacted the City of Stockton Fire Department and Building Department to obtain available records regarding the type of businesses previously located adjacent to Thrifty#171 Building department records indicate that a service station was previously located at 1502 North Wilson Way, directly north from the site across Wilson Way The earliest building record indicates that a service station was located at 1502 North Wilson Way as far back as 1948 The station was demolished and rebuilt in 1963 The most recent record (7/27177) indicates that Winston Tire was the site operator Currently, a smog certification business is located at 1502 North Wilson Way Building records also indicate that a service station was located at 1440 Harding Way, directly west from the site across North Wilson Way The earliest building record indicates that a service station was present on the site as least as far back as November 1955 Records indicate that the USTs were removed from the site in 1977 and Kragen Auto Supply then began retail auto parts sales that continue to the date of this report Selected building records are provided in Appendix F According to the SJCEHD2, neither site is listed on the San Joaquin County Contaminated Site Database and there is no known contamination at either site However, there have also been no known investigations performed at either site 7.0 DISTRIBUTION OF PETROLEUM HYDROCARBONS IN THE SUBSURFACE Petroleum hydrocarbons exist in soil and groundwater beneath the site as the result of past station operations Since the initiation of site investigation activities in December 1987, several site assessments (described in Section 3 0) have been performed to characterize the distribution of hydrocarbons in the subsurface A summary of the distribution of hydrocarbons in soil and groundwater beneath the site is provided on the following page • 1 Mr Eric Mar, California Water Service Company,Personal Communication,May 20 and August 3I,2004 2 San Joaquin County Environmental Health Department, e-mail dated September 3, 2004 6