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V 1117 Lone Palm Avenue Suite B <br /> T Modesto California 95351 <br /> www atc-enviro com <br /> 209 579 2221 <br /> Fax 209 579 2225 <br /> A S S O C I A T f S I N C <br /> r <br /> �J <br /> May 14, 2001 <br /> 54 62500 0001 <br /> Mr Jeff Wong <br /> San Joaquin County Public Health Services �� Y`t <br /> Environmental Health Division <br /> 304 E Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject Monitoring Report First Quarter 2001, 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 /> March 2001 by ATC Associates Inc at the site located at 1805 Harbor Street, Stockton, <br /> i' California (Figure 1) Sampling was performed to monitor the distribution of petroleum <br /> hydrocarbons in groundwater at the site Monitoring was performed to determine the <br /> groundwater flow direction and the hydraulic gradient in the uppermost aquifer <br /> SITE HISTORY <br /> In January 1988, one 10,000-gallon gasoline underground storage tanks (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, MW1 <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 I625001quartly\1gr-2001 doc 1 <br />