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Page 2 Mr Michael Infurna Jr Senior REHS October 11, 2002 The property east of the site, across South Center Street at 1725 E1 Dorado Street, is a business currently operated as Glass Replacement and Supplies This property is situated on a traffic island between South Center and El Dorado Streets Historic information indicates that this property was formerly operated as a retail gasoline station until about 1986 UST Related Activities A 1,000-gallon gasoline UST located beneath the sidewalk along South Center Street, an associated fuel dispenser located within the property building, and the portion of product piping from the UST to the building were removed in December 1990 The remaining product piping, from the edge of the building to the former dispenser, was properly abandoned on April 17, 1998 On April 16, 1998, PSC drove two 1-inch diameter Geoprobe-type probeholes beneath the former UST to collect soil and groundwater samples for laboratory analysis Analytical results, summarized in PSC's June 2, 1998 Preliminary Subsurface Site Investigation Results and Product Piping Abandonment Completion report, indicated potential benzene, toluene, ethylbenzene, and xylenes (BTEX) impact to subsurface soil and groundwater Soil and groundwater samples collected at this time did not contain detectable oxygenate compounds In July 1999, Ground Zero Analysts, Inc (GZA) of Escalon, California, performed a subsequent subsurface investigation GZA drilled three soil borings, completed them as groundwater monitoring wells (labeled MW-1 through MW-3), and collected soil and groundwater samples for laboratory analysts GZA's investigation, summarized in their July 28, 1999 Groundwater Monitoring Well Installation Report, detected BTEX and total petroleum hydrocarbon as gasoline (TPHg) impact to soil and groundwater samples collected at the MW-2 location (see Figure 2) Samples collected from MW-1 and MW-3, placed to upgradient positions relative to the former UST, did not contain detectable petroleum hydrocarbons The San Joaquin County Environmental Health Department (EHD) directed that several quarters of groundwater monitoring be performed to assess evolving conditions Results of these monitoring events indicated that relatively high petroleum concentrations were measured in samples collected at the MW-2 location and non-detectable or relatively low concentrations at the upgradient locations