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1117 Lone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> www ate-enviro com <br /> 209 579 2221 <br /> CV: -J%TC Fax 209 579 2225 <br /> A S S O G I A T E S I N C <br /> January 29, 2003 [ ��� V E <br /> 54 14981 0001 <br /> JAN 3 1 2043 <br /> Ms Margaret Lagorio <br /> San Joaquin County, Environmental Health DivisialVIRC)NMENT HEALTH <br /> 304 E Weber Street, Third Floor PERMIT/SERVICES <br /> Stockton, California 95202 <br /> Subject Monitoring Report Fourth Quarter 2002, N & S Irrigation Property, 215 West <br /> Main Street, Ripon, California <br /> Dear Ms Lagorio <br /> This report presents the results of quarterly groundwater monitoring and sampling performed on <br /> December 2, 2002 by ATC Associates Inc at the site located at 215 West Main Street, Ripon, <br /> California (Figure 1) Monitoring was performed to determine groundwater flow direction and <br /> the hydraulic gradient in the uppermost aquifer Sampling was performed to monitor the <br /> petroleum hydrocarbons in the groundwater at the site <br /> . BACKGROUND <br /> In March 1990, one 1,500-gallon unleaded gasoline underground storage tank (UST), one <br /> unleaded gasoline UST of unknown size, and all associated piping and dispensing equipment <br /> were removed and transported off-site Laboratory analysis of soil samples collected from <br /> beneath the former 1,500-gallon UST location indicated the presence of detectable <br /> concentrations of total petroleum hydrocarbons Discoloration of the soil and a petroleum <br /> hydrocarbon odor were noted in the field After the tanks were removed, the areas of the former <br /> tanks were backfilled <br /> On November 14, 1997, a geologist from ATC Associates supervised the advancement of two <br /> soil borings to 30 feet below ground surface (bgs) Analytical results of soil samples indicated <br /> the presence of petroleum hydrocarbons One groundwater sample was collected from each <br /> boring at the depth groundwater was first encountered, approximately 30 feet bgs Groundwater <br /> samples indicated the presence of petroleum hydrocarbons Results are summarized in ATC's <br /> Summary Report of Subsurface Investigation, dated January 14, 1998 <br /> On July 13, 1998, a geologist from ATC Associates supervised the advancement of four soil <br /> borings to 26 to 31 feet bgs Analytical results of soil samples indicated the presence of - <br /> petroleum hydrocarbons One groundwater sample was collected from each boring at the depth <br /> groundwater was first encountered Groundwater samples indicated the presence of petroleum , <br /> hydrocarbons Results are summarized in ATC's Summary Report of Additional Subsurface <br /> • Investigation, dated September 9, 1998 <br /> 1 <br /> w\Wordpro1149811Rcpor[-�WM6#RENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />