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r � r 21 December 2001 r AGE-NC Project No 97-0343 Page 3 of 4 r32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES r TPH-d was detected in the water sample collected from MW7 at a concentration of 99 µg/1 No other analytes were detected above laboratory reporting limits in the ground water samples collected from wells MW4 through MW7 rThe analytical results of water samples collected to November 2001 are summarized on Table 2 The laboratory reports (MAI Lab I D No 83022-83025), QA/QC report and chain-of-custody form are rincluded in Appendix B r4 0. SUMMARY AND CONCLUSIONS rBased on the data collected from the site, AGE finds • Ground water flow at the site on 06 November 2001 was inferred to be generally toward the r northwest at an average gradient of 0 002 feet/feet Ground water elevations at the site decreased in wells MW4 through MW7 an average of 3 91 feet since the third quarter 2001 monitoring event r • TPH-d was detected for the first time in four sampling events in the sample collected from MW7 at a low concentration of 99 µg/1 No other analytes were detected above laboratory reporting limits in the ground water samples collected from wells MW4 through MW7 rGround water samples could not be collected from wells MW I through MW3 because ground water elevations at the site were below the screened intervals In these wells r 5.0. RECOMMENDATIONS rBased on the findings of the environmental activities recounted in this report, AGE recommends continued quarterly morutoring of the ground water monitoring wells on-site The next monitoring revent should be performed in February 2002 A work plan to define the vertical extent of impacted ground water and perform a soil vapor rextraction pilot test has recently been approved by San Joaquin County PHS-EHD AGE anticipates the work will be performed during the first quarter 2002 r r rAdvanced GeoEnvironmental,Inc