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�I 31VrFN EN7ALTECHNOLOGIESCORPORA710N October 20, 1997 97735 Ms Mary Meays San Joaquin County Public Health Services, Environmental Health Division 304 E Weber Street, Third Floor Stockton, CA 95202 Subject Summary Report for Subsurface Investigation at 2804 East Fremont Street, Stockton, California Dear Ms Meays Smith Technology Corporation has prepared this letter report, on behalf of Diesel Performance, . Inc to summarize findings the subsurface investigation performed at the above referenced site (Figure 1) The purpose of the subsurface investigation was to determine the extent of residual soil contamination and its potential threat to groundwater This work is being done at the request of San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) The scope of work, in brief, included obtaining permits, advancing five soil borings, soil sampling and analysis, and preparing this technical summary report The findings of the subsurface investigative study are summarized in the following paragraphs SITE LOCATION The site is located on the south side of Fremont Street in Stockton, California, as shown on Figure 1 The location is a residential, commercial, and industrial area The site is currently occupied by a diesel engine repair facility BACKGROUND In February 1987, SEMCO removed and disposed of one 3,000-gallon unleaded gasoline tank, associated piping, and fuel dispenser from the location shown on Figure 2 A soil sample collected at 13 feet below ground surface contained elevated concentrations of petroleum hydrocarbon contaminants The excavation was subsequently backfilled and resurfaced • w 197735Veportslsum doc 1 1260 Graphics Drive - Modesto,CA 95351-1502 - (209)579-2221 - Fax(209)579-2225 Engineering - Consulting - Remediation - Construction