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Y 7 GROUND ZERO ANALYSIS, INC. 1714 Main Street y 18 P19 1 29L Escalon,California 95320 Telephone: (209) 838-9888 Facsimile: (209)838-9883 September 7, 2001 Ms. Dot Lofstrom San Joaquin County Public Health Services Environmental Health Division 304 East Weber Avenue, Third Floor Stockton, CA 95202 Subject: Groundwater Monitoring Well Installation Report Former Valley Volkswagen, 647 E. Miner Ave., Stockton, CA Site Code: 1187 Dear Ms. Lofstrom: Ground Zero Analysis, Inc. (Ground Zero) has prepared this report on behalf of Mr. Jay Friedman to summarize the installation of one groundwater monitoring well and present analytical results of soil and groundwater samples collected during the investigation. The work was conducted at the request of the San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) to determine if a methyl tert butyl ether (MTBE) plume is present at the site, and if so to evaluate its nature and extent. This work was conducted in accordance with the Workplan for Additional Monitoring Well Installation dated March 5, 2001 and the PHSIEHD approval letter dated March 8, 2001. 1.0 SITE BACKGROUND 1.1 Site Description The site is currently operated as an automotive repair center by Stockton Clutch and Brake, and is located in a predominantly commercial and residential area, on the northwest corner of Miner Avenue and Stanislaus Street in Stockton, California (Figure 1). 1.2 Previous Investigation , On July 29, 1987, two underground storage tanks (UST's), one 750-gallon waste oil and one 1000- gallon waste oil, were removed from the property by Walker Hydraulics of Pleasant Hill, California. One soil sample was collected at 12 ft below ground surface (bgs) beneath the smaller UST. The laboratory analytical results indicated total petroleum hydrocarbon (TPH) concentrations of 370 parts per million(ppm) and total xylenes at a concentration of 44 ppm.