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i <br /> i' ATC Associates Inc <br /> 1117 Lone Palm Avenue, Suite B <br /> %T C <br /> Modesto, California 95351 <br /> " 209-579-2221 <br /> ASSOCIATES INC Fax 209-579-2225 <br /> July 15, 2005 <br /> 54 25291 0001 <br /> Mr Jeff Wong <br /> San Joaquin County <br /> Environmental Health Division <br /> 304 E Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject Monitoring Report Second Quarter 2005, Former Greer Property, 15634 Steinegul <br /> Road, Escalon, California, Site Code 2021 <br /> Dear Mr Wong <br /> This report presents the results of quarterly groundwater monitoring and sampling performed on May <br /> 20, 2005 by ATC Associates Inc (ATC) at the site located at 15634 Steinegul Road, Escalon, <br /> California (Figure 1) Monitoring was performed to evaluate the groundwater flow direction and the <br /> • hydraulic gradient in the uppermost aquifer Sampling was performed to monitor the distribution of <br /> petroleum hydrocarbons in groundwater at the site <br /> BACKGROUND <br /> In May 1987, one 550-gallon gasoline underground storage tank (UST) and one 1,000-gallon <br /> gasoline UST were removed from: the site by H&H Ship Service The USTs were transported <br /> and disposed of at the Levin Metal Corporation disposal site in Richmond, California A soil <br /> sample collected from beneath the 1,000-gallon UST contained detectable concentrations of <br /> benzene, toluene, ethyl benzene, and xylenes (BTEX) constituents <br /> In March 1997, WHF, Inc , supervised the advancement of one soil boring to 80 feet below <br /> ground surface (bgs) Soil and groundwater samples contained detectable concentrations of total <br /> petroleum hydrocarbons as gasoline (TPHg) and BTEX A water sample was collected from the <br /> on-site drinking water well and was reported to contain no detectable concentrations of <br /> petroleum hydrocarbons <br /> In December 1998, BSK & Associates (BSK) advanced five borings at the site and completed <br /> four of the borings as groundwater monitoring wells (MW1 through MW4) Soil samples <br /> collected from B2 and MW2 contained detectable concentrations of TPHg and BTEX Soil <br /> samples collected from B2 contained detectable concentrations of methyl tertiary butyl ether <br /> (MTBE) <br /> Slenvlrornenta11252911reportsl2ndQR-2005 doc I <br />�j1� <br />