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' for full-scale implementation SJCEHD approved the workplan in correspondence dated August 6, 2002 ' The air sparging and soil venting pilot test was performed in January 2003 The pilot test results were submitted in the March 6, 2003 Remedial Action ' Plan The findings indicate that this approach would be effective in remediating impacted soil and groundwater SJCEHD approved the Remedial Action Plan in correspondence dated March 25, 2003 ' Under an approved San Joaquin Valley Air Pollution Control District (SJVAPCD) permit, PSC installed a soil vapor extraction (SVE) system and began continuous operation on November 18, 2003 During system operation, airflow rates are measured in sparging well SP-1 ' and in venting wells VW-1 and MW-2 weekly The combined venting rates prior to the addition of dilution air for VW-1 and MW-2 have ranged from 2148 cubic feet per minute (cfm) to 90 05 cfm, as of December 16, 2004 In ' addition, three vapor samples are collected from the influent stream prior to the addition of dilution air (designated Influent), the air stream after treatment by the first carbon vessel (designated GAC-1), and from the discharge from ' the second and final carbon vessel (designated GAC-2) The samples are then submitted to an analytical laboratory for BTEX and TPH-G analyses Results are reported to the SJVAPCD A quarterly groundwater-monitoring event was performed in January 2004 The event data indicated that the groundwater elevation was approximately 1 7 feet lower than the previous event performed in April 2003 During this event, the average depth to groundwater was 29 16 feet below ground surface (bgs) 1-19 39 feet mean sea level (msl)} All referred bgs measurements are ' taken from the top of well casing The groundwater flow was easterly at a gradient of approximately 0 005 foot per linear foot Petroleum hydrocarbons were detected in well MW-2, but they were significantly lower than in previous events There were no detectable BTEX or TPH-G concentrations measured in the samples collected from the remaining wells MW-1, MW-3, or MW-4 Oxygenate analytes were not detected in any samples ' The April 2004 quarterly groundwater-mnrtoring event indicated that the groundwater elevation increased approximately 142 feet from the previous ' event performed in January 2004 During this event, the average depth to groundwater was 27 73 feet bgs (-17 97 feet msl) The groundwater flow was easterly at a gradient of approximately 0 005 foot per linear foot Benzene ' was not detected in well MW-2 during this event The concentrations of toluene, ethylbenzene, xylenes, and TPH-G in well MW-2 decreased significantly from previous events BTEX and TPH-G were not detected in ' the samples collected from wells MW-1, MW-3, or MW-4 MTBE was the 4 Quarterly Groundwater Monitoring Report March 2005 Prepared for SARA LEE BAKERY CROUP,INC Prepared by Philip Services Corporation Investigative and Quarterly R"rt%1st Quarterly Report 03_2005(final) September 23,2005