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- <br /> • w •.,�,., '� t .. �. - ,q w �E �P � � •�fir. ��. <br /> ha <br /> PROBLEM ASSESSMENT REPORT <br /> w <br /> SHELL SERVICE STATION <br /> 7910 LOWER SACRAMENTO ROAD <br /> i STOCKTON,CALIFORNIA <br /> SHELL WIC NO.204-7524-0808 <br /> DELTA PROJECT NO.40.8E-147 <br /> 1.0 INTRODUCTION <br /> Delta Environmental Consultants,Inc.(Delta),has been authorized by Shell Oil Company(Shell)to conduct <br /> a hydrogeologic investigation and perform remediation at a retail gasoline service station located at 7910 <br /> Lower Sacramento Road,Stockton,San Joaquin County,California(site). <br /> This report presents the results of an on-site hydrogeologic investigation. Based on the results,this report <br /> also presents a discussion of soil remedial action alternatives applicable to the site. Remedial measures <br /> , <br /> b discussed below are intended to address the known and assumed distribution ofpetroleum constituents in <br /> soil and ground water beneath the site. <br /> ' I.1 Pnranse <br /> is <br /> Delta has conducted a continuing investigation at the site since tank closure activities began in December <br /> 1988. The work was performed to achieve the following objectkms; <br /> F Quantitatively assess the horizontal and vertical extent of petroleum constituents in soils <br /> underlying the Fite <br /> fir. s <br /> f <br /> ,., • Quantitatively assess the distribution of petroleum constituents in ground water beneath the site. <br /> • Prop-ne remedial actions to reduce petroleum constituent concentrations in soil and ground <br /> water beneath the site to acceptable levels. <br /> r <br /> a' <br /> "• 1_2 Scans o[Word <br /> b� — <br /> ATI work was conducted using U.S.Environmental Protection Agency(EPA) and/or California Regional <br /> Water Quality Control Board, Leaking Underground Storage Tank (LUFI) approved methods. The <br /> i following is a list of activitics performed by Delta between May 1989 and June 1990 <br /> S <br /> { <br />