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� v - <br /> 0 <br /> ASSOCIATES I NC <br /> Summary Report of <br /> Pumping Test and Remedial Investigation <br /> Feasibility Study <br /> Ripon Unified School District <br /> 304 North Acacia Avenue <br /> Ripon, California <br /> ATC Project No 13099 0001 <br />' 1.0 INTRODUCTION <br /> ATC Associates Inc has prepared this letter report, on behalf of Ripon Unified School District to <br /> summarize the pumping test and remedial investigation feasibility study performed at 304 North <br /> Acacia Avenue, Ripon, California (Figure 1) The purpose of the remedial investigation <br /> feasibility study was to evaluate groundwater extraction and treatment as a remedial option This <br /> work was performed at the request of San Joaquin County Public Health Services, Environmental <br /> Health Division (PHS/EHD) The findings of the study are summarized in the following report <br /> 1 1 Site Location <br /> The site is located on the east side of North Acacia Avenue and the north side of Pine Street in <br /> Ripon, California, as shown on Figure I The location is a residential and commercial area The <br /> site is currently occupied by Ripon Unified School District <br /> 1_2 Back round <br /> In February 1991, one 500-gallon underground storage tank (UST) of unknown fuel was <br /> removed, in August 1991, one 550-gallon unleaded gasoline UST was removed, in October <br /> 1991, 47 feet of single wall piping was removed, and, in December 1991, one 7,500-gallon <br /> unleaded gasoline UST was removed Laboratory analysis of soil samples collected from <br /> beneath the former USTs and piping locations indicated the presence of detectable concentrations <br /> of total petroleum hydrocarbons Discoloration of soil and petroleum hydrocarbon odors were <br /> noted in the field After the tanks were removed, the areas of the former tanks were backfilled <br /> with the stockpiled material <br /> One 10,000-gallon diesel UST was removed in late 1998 Laboratory analysis of soil samples <br /> collected from beneath the former UST contained no detectable concentrations of petroleum <br /> hydrocarbon odors After the UST was removed, the area of the former tank was backfilled <br /> w\130991repoM\sumweh doc 1 <br />