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PROBLEM ASSESSMENT REPORT <br /> ' MORELAND COURT SHELL <br /> ' 7700 MORELAND COURT <br /> STOCKTON, CALIFORNIA <br /> DELTA PROJECT NO. 40-88-146 <br /> 10 INTRODUCTION <br /> ' Delta Environmental Consultants,Inc (Delta),has been authorized by Shell Oil Company(Shell)to perform <br /> a site geologic investigation at 7700 Moreland Court, Stockton, California (site) (Figure 1) A site <br /> ' assessment was initiated in response to the detection of petroleum hydrocarbons in the soil upon removal <br /> of the underground storage tanks on December 27, 1988 This investigation was summarized in Delta's Phase <br /> ' I Hydrogeologic Assessment Report, dated October 5, 1989, and an addendum to that report, dated <br /> December 20, 1989 The San Joaquin County Environmental Health Division (County) reviewed Delta's <br /> reports and requested, in a letter dated January 23, 1990, that Shell prepare a Prehmmary Report for a <br /> ' hydrogeologic investigation at the site A Preliminary Report, prepared by Delta, was submitted to the <br /> County on March 14, 1990 That report proposed the installation of three ground water monitoring wells <br /> at the site to determine whether ground water contained petroleum hydrocarbons Depth to ground water <br /> was expected to be approximately 30 feet Upon verbal County approval, Delta implemented the work <br /> ' proposed in the Preliminary Report <br /> ' This report summarizes the results of previous site investigation activities and presents the results of the most <br /> recent drilling event conducted on August 1, 1990 The results indicate that the ground water table is greater <br /> than 70 feet below site grade Also,concentrations of total petroleum hydrocarbons(TPH)as gasoline were <br /> less than laboratory method detection limits to 11 soil samples collected from 5 soil borings at depths ranging <br /> between 10 and 70 feet below site grade <br /> 1 <br /> 1.1 Purpose <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 objectives <br /> • Quantitatively assess the horizontal and vertical extent ofetroleum constituents onstituents in soils <br /> underlying the site <br />