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1� ATC Associates Inc <br /> 1117 Lone Palm Avenue, Stute 13 <br /> (: <br /> Modesto, California 95351 VYATC <br /> 209-579-2221 <br /> ASSOC IATES 1 M c Fax 209-579-2225 <br /> January 25, 2005 <br /> 54 25291 0001 <br /> Lrl <br /> Mr Jeff Wong .JAN 2 7 2005 <br /> San Joaquin County <br /> Environmental Health Division ENVIRONMENT HEALTH <br /> 304 E Weber Street, Third Floor PERMIT/SERVICES <br /> Stockton, California 95202 <br /> Subject Monitoring Report Fourth Quarter 2004, Former Greer Property, 15634 Stemegul <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 <br /> November 19, 2004 by ATC Associates Inc (ATC) at the site located at 15634 Stemegul Road, <br /> Escalon, California (Figure 1) Monitoring was performed to determine the groundwater flow <br /> direction and the hydraulic gradient in the uppermost aquifer Sampling was performed to monitor <br /> the distribution of 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 collected from the soil boring contained <br /> detectable concentrations of total petroleum hydrocarbons as gasoline (TPHg) and BTEX A <br /> water sample was collected from the on-site drinking water well was reported to contain no <br /> detectable concentrations of petroleum hydrocarbons <br /> In December 1995, BSK & Associates (BSK) advanced five borings at the site and completed <br /> four of the borings as groundwater monitoring wells MW i through MW4 Soil samples collected <br /> from bonngs B2 and MW2 contained detectable concentrations of TPHg and BTEX Soil <br /> samples collected from soil boring B2 contained detectable concentrations of methyl tertiary butyl <br /> ether (MTBE) <br /> s\enviro�1125291Veportsl4QR-2004 doe 1 <br />