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LK ,r7 ATC Associates Inc <br /> 1117 Lone Palm Avenue, Suite B <br /> v 1 Modesto, California 95351 <br /> 209-579-2221 <br /> ' AssoCIATEs INC Fax 209-579-2225 <br /> December 29, 2006 I� !� <br /> 54 25291 0001 R L�C� V E U <br /> ' AN 0 S 2007 <br /> ENVIRONMENT HEALTH <br /> ' Ms Lon Duncan PERMIT/SERVICES <br /> San Joaquin County <br /> Environmental Health Division <br /> 304 E Weber Street, Third Floor <br /> Stockton, California 95202 <br /> ' Subject Monitoring Report Third Quarter 2006, Former Greer Property, 15634 Steinegul <br /> Road, Escalon, California, Site Code 2021 <br /> ' Dear Ms Duncan <br /> This report presents the results of quarterly activities performed during the third quarter of 2006, <br /> by ATC Associates Inc (ATC) at the site located at 15634 Stemegul Road, Escalon, California <br /> (Figure 1) Monitoring and sampling were performed to evaluate the groundwater flow direction, <br /> the hydraulic gradient and the distribution of petroleum hydrocarbons in groundwater at the site <br /> Operations and maintenance were performed on the soil vapor extraction (SVE) system during <br /> ' monthly sampling and monitoring events <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 total 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 petroleum <br /> hydrocarbons (TPHg and BTEX) <br /> In December 1998, BSK & Associates (BSK) advanced five borings at the site and completed <br /> four as momtonng wells (MW 1 through MW4) Soil samples collected from B2 and MW2 <br /> S 154 2951 000110&W1st-qlr-2446 doe 1 <br /> 1 <br />