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6ETTLER - RYAN INC. <br /> SUBSURFACE INVESTIGATION REPORT <br /> for <br /> Tosco (Former BP) Service Station No 11192 <br /> 1403 Country Club Boulevard <br /> Stockton, California <br /> Report No 140245 03-3 <br /> 1.0 INTRODUCTION <br /> This report summarizes the results of the recent subsurface investigation performed by Gettler-Ryan <br /> Inc (GR) at the subject site The work was performed at the request of Tosco Marketing Company <br /> (Tosco) in response to a letter from the San Joaquin County Public Health Services, Environmental <br /> Health Division (PHS-EHD) dated February 9, 2001 The purpose of the investigation was to <br /> delineate the lateral and vertical extent of Methyl tertiary-Butyl Ether (MTBE) impacted <br /> groundwater at and in the vicinity of the subject site The proposed scope of work was approved by <br /> the PHS-EHD in a letter to Tosco dated March 29, 2001 The scope of work included preparing a <br /> site-specific safety plan, obtaining the required permits, advancing 6 offsite and 2 onsite <br /> GeoprobesO, conducting an onsite cone penetrometer test (CPT), collecting and submitting selected <br /> soil and all grab groundwater samples for chemical analysis, conducting a sensitive receptor survey, <br /> and preparing,a report summarizing the findings of the investigation <br /> 2.0 SITE DESCRIPTION <br /> 2.1 General <br /> The site is located on the northwest corner of the intersection of Country Club Boulevard and <br /> Pershing Avenue in Stockton, California (Figure 1) The site is currently an operating Tosco (76) <br /> Service Station Aboveground facilities on the subject site include a station building, a car wash, <br /> auto service and oil change buildings (operated by others) and four dispenser islands Underground <br /> facilities include two gasoline underground storage tanks (USTs), one waste oil UST (operated by <br /> others) and six groundwater monitoring wells (MW-1 and MW-3 through MW-7) Properties in the <br /> site vicinity are developed primarily for residential and retail use A former Shell service station was <br /> previously located across Pershing Avenue to the east of the subject site <br /> 140245 03 3 <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 - 7555 <br />