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• <br /> Site Assessment Work Plan - May 1999 <br /> Former FISCO WAREHOUSE (Howard Lenz Property) <br /> 1648 Shaw Road, Stockton, California <br /> 1.0. INTRODUCTION <br /> At the request of Mr Peter Lenz, and in accordance with requirements of the San Joaquin County <br /> Public Health Services-Environmental Health Division(PHS-EHD),Advanced GeoEnvironmental, <br /> Inc (AGE) has prepared this Site Assessment Work Plan for additional investigation of the former <br /> underground storage tank (UST) area at 1648 Shaw Road, Stockton, California The site setting is <br /> illustrated in Figure 1 A plan of the site is illustrated on Figure 2 <br /> Two USTs were removed from the site in 1986 Five soil probe borings were advanced at the site <br /> in September 1997 and petroleum hydrocarbons were detected in soil samples analyzed Impacted <br /> soil was encountered to a depth of 50 feet bsg, with the higher concentrations occurring 10 feet to <br /> 30 feet bsg The lateral extent of impacted soil toward the north and west has not been defined <br /> Ground water samples were not collected Site background and previous investigation are <br /> summarized in the Preliminary Site Investigation Report, dated 30 December 1997 and prepared by <br /> AGE <br /> This Work Plan is prepared in accordance with PHS-EHD and Central Valley Regional Water <br /> . Quality Control Board (CVRWQCB) guidelines <br /> 2.0. SCOPE OF WORK <br /> Based on the results of laboratory analysis of soil samples collected during removal of the USTs and <br /> previous site assessment activities, the PHS-EHD is requiring additional assessment to determine <br /> the lateral and vertical extent of hydrocarbon-impacted soil and ground water <br /> To achieve the objectives of the PHS-EHD's additional required assessment, the scope of work of <br /> this work plan includes advancement and sampling of four soil borings to collect soil and ground <br /> water samples,and completion of one boring as a ground water monitoring well/soil vapor extraction <br /> well If necessary, additional borings will be advanced to adequately characterize the lateral and <br /> vertical extent of hydrocarbon-impacted soil Ground water is estimated to currently occur at <br /> approximately 50 to 55 feet below surface grade (bsg), based on data obtained from ground water <br /> monitoring wells located near the site <br /> If necessary,additional investigation and/or remediation will be addressed in a subsequent work plan <br /> addendum Tasks for the investigation of the extent of petroleum hydrocarbons at the site are <br /> described below <br />