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In July and September 1987, Environmental Science & Engineering (ESE) <br /> installed three groundwater monitoring wells (MW-1 through MW-3) In <br /> January 1988, Anderson Consulting Group (ACG) installed wells MW-4 and <br /> MW-5 ACG subsequently drilled soil borings 90-1 and 90-2, and installed <br /> wells MW-6 and MW-7 in February 1990, then MW-8 in September 1990 <br /> 1 PSC (formerly Burlington Environmental) installed wells MW-9 through <br /> MW-13 in March 1994, and piezometers PZ-I and PZ-2 and air sparge well <br /> SP-1 in September 1994 <br /> PSC performed a soil venting and air sparging pilot test in October and <br /> November of 1994 to evaluate the effectiveness of this remediation <br /> technology Soil venting tests were performed using well MW-1, and air <br /> sparging tests were performed using well SP-1 Results of the tests, contained <br /> in PSC's February 1, 1995 Final Remediation Plan, indicated that soil venting <br /> and air sparging would be effective in remediating hydrocarbon impact <br /> 1 In June 1995, PSC proceeded with the installation of air sparging wells SP-2 <br /> through SP-6 Implementation of the sparge and vent remediation was <br /> postponed due to petroleum hydrocarbon concentration reductions that were <br />' observed to be naturally occurring at the site <br /> In May 1999, PSC performed a subsurface investigation using cone <br /> penetrometer (CPT) technology Three CPT borings (CPT-1 through CPT-3) <br /> were driven, and soil and groundwater samples were collected for analysis <br /> This CPT investigation indicated that the lateral extent of impacted <br /> groundwater is largely contained within Earthgrains's property boundaries <br /> Results from this investigation were reported in PSC's May 1999 Subsurface <br /> Investigation and Groundwater Monitoring Report <br /> An additional air sparging and soil venting pilot test was performed in June <br /> 2000 using the newly drilled well VW-1 This test was conducted in general <br /> accordance with procedures described in PSC's May 15, 2000 Pilot Testing <br /> Work Plan Once again, pilot test results indicate that this technology would <br /> be an effective method of treating petroleum hydrocarbon impact at the site <br /> Test results and designs for an air sparging and soil venting remediation <br /> system are contained in PSC's August 31, 2000 Remedial Action Work Plan <br /> 1 1.3 Historic Groundwater Conditions <br /> Assessment of petroleum hydrocarbon impact in groundwater has been <br /> performed at this site since July 1987 Historic groundwater monitoring <br /> indicates that decreases of petroleum hydrocarbon concentrations have <br /> occurred due to natural degradation Benzene concentrations in samples <br /> 5 <br /> October 2001 <br /> Groundwater Monitoring Report <br /> THE EARTHGRAINs BAKING COMPANY <br /> 2651 South Airport Way <br /> Stockton,California <br /> Prepared for THE EARTHGRAINS BAKING COMPANY Prepared by Philip Services Corp <br /> H\FNV1624001321121382EG5Suv kton\Stwkmn11001mon do November 16,2001 <br />