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1117 Lone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> http llwww atcassociates com <br /> CV2095792221 <br /> Assoc IATES INC <br /> Fax 209 579 2225 <br /> LF <br /> August 24, 2004 <br /> 54 25291 0001 SEP 0 2 2004 <br /> ENV!Rl?"OVEN T <br /> pERr41 resERVICE��rH <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 2004, Former Greer Property, 15634 Steinegul <br /> Road, Escalon, California <br /> Dear Mr Wong <br /> This report presents the results of quarterly groundwater monitoring and sampling performed during <br /> the second quarter 2004 by ATC Associates Inc 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 to 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 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 borings B2 and MW2 contained detectable concentrations of TPHg and BTEX <br /> Soil samples collected from soil boring 132 contained detectable concentrations of methyl tertiary <br /> butyl ether (MTBE) <br /> In June and July 2000, WHF supervised the advancement of ten soil borings at the site and <br /> completed five of the borings as groundwater monitoring wells MWS, MW6, MW8, MW9, and <br /> S\Envlromenta1125291\reportsl2QR-2004 doc 1 <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />