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Y <br /> 1117 Lone Palm Ave , Suite B <br /> V Modesto, California 95351 <br /> www atc-enwro corn <br /> 209 579 2221 <br /> Fax 209 579 2225 <br /> .,� A S S O C I A T E S 1 N C <br /> October 9, 2002 <br /> 54 62500 0001 <br /> r <br /> l <br /> Mr Jeff Wong <br /> San Joaquin County Environmental Health Division <br /> 304 E Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject Monitoring Report Second Quarter 2002, Former Continental Grain Facility, 1805 <br /> Harbor Street, Stockton, California <br /> Dear Mr Wong <br /> This report presents the results of quarterly groundwater monitoring and sampling performed in <br /> June 2002 by ATC Associates Inc at the site located at 1805 Harbor Street, Stockton, California <br /> . (Figure 1) Sampling was performed to monitor the distribution of petroleum hydrocarbons in <br /> groundwater at the site Monitoring was performed to determine the groundwater flow direction <br /> and magnitude of the hydraulic gradient in the uppermost aquifer <br /> SITE HISTORY <br /> In January 1988, one 10,000-gallon gasoline underground storage tank (UST) and all associated <br /> piping were removed from the location shown on Figure 2 One soil sample was collected from <br /> each end of the UST and analytical testing indicated the sample contained detectable <br /> concentrations of petroleum hydrocarbon constituents The excavation was subsequently <br /> backfilled <br /> In October 1997, an ATC geologist supervised the advancement of seven soil borings to <br /> approximately 26 feet below ground surface (bgs) The borings were advanced using a truck <br /> mounted Geoprobe® narrow diameter rig employing direct push technology Soil and grab <br /> groundwater samples collected from the vicinity of the former 10,000-gallon UST contained <br /> detectable concentrations of petroleum hydrocarbons <br /> On August 12, 1998, ATC personnel supervised the advancement of three soil borings, MW I <br /> through MW3, at the site to depths of approximately 28 feet bgs The soil borings were <br /> completed as groundwater monitoring wells and on August 14, 1998 the wells were developed <br /> and sampled Analytical data indicated that soil and groundwater samples contained detectable <br /> W 1625001quartfyti2gr-2002 doe I <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />