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r �m �.'t"a'� 4-'«- _ .C., ;x ''�' - .+�,ns•,,; .—d' �.� 'Rs � f _ $ _ ..mac -` <br /> yr <br /> _ SITE ASSESSMENT REPORT <br /> CHEVRON SERVICE STATION NO.94W <br /> 130 SOUTH CENTER <br /> STOCKTON,CALIFORNIA <br /> APRIL 1881 <br /> INTRODUCTION <br /> This report presents the results of she assessment activltles performed by Groundwater <br /> Technology, Inc.at Chevron Service Station No.54)557 In Stockton,California(Figure 1). The work was <br /> y. performed under release number 260-8240 issued by Mr.Clint Rodgers of Chevron U.S.A.Inc. <br /> (Chevron). This site Is located at 139 South Center Street,on the northwest comer of the Intersection of <br /> South Center Street and Washington Street In Stockton,California The purpose of the assessment was <br /> ;o Investigate the possible occurrence of dissolved-gasoline hydrocarbons In the groundwater beneath <br /> r the site. This assessment Included the installation of four groundwater-monitoring wens on the perimeter <br /> of the site,the collection and analyses of soil and groundwater samples,and the preparation of this <br /> report The installation of the monitoring wells was performed In accordance with guldellnes established <br /> by the San Joaquin County Public Health Department,Environmental Health Division (SJCEHD). <br /> BACKGROUND <br /> SITE HISTORY <br /> um According to the station owner,Mr. Ron Sanchez,the she has been In operation since 1969. In <br /> April 1990,all of the underground storage tanks at this site were removed and new underground fuel- <br /> r. <br /> storage tanks were Installed. Table 1 summarizes the ava=le information about the storage tank <br /> ;.; <br /> history at the site. As required by the SJCEHD,soil samples were collected from the excavation pits <br /> and along the piping trenches for the fuel lines. Laboratory analyses results of these camples Indicated <br /> adsorbed hydrocarbons It excess of 50 parts per million (ppm) In four soil samples(two from the fuel- <br /> tank pit,one from the waste IRar:k pit.and one from the tsouthem end of the eastern pump Island). <br /> Based on these findings,Groundwater Technology, Inc.conducted additional soli excavatici In these <br /> p•• areas. Subsequent sampiing and Laboratory analyses of soil samples collected from the bases of the <br /> deepened fuel-tank and waste-oil tank-excavation pits showed concentrations of adsorbed hydrocarbons <br /> Ef.GROi}NDWATER <br /> INC. <br /> TECHNOLOGY, <br />