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I15 January 2004' S AGE-NC Project N6.:98-0440 ; Page3 of 4 •3.1ANALYTICAL RESULTS OF GROUND WATER SAMPLES' TPH-g;.BTEX and MTBE were not detected at or above laboratory reporting limits in the'water ;samples collectedfrom,the inoriiforing wells'and domestic water well on-site this'quarter: Current and previous'analytical'results are summarized on Table 2. The laboratory report (MAI Work•-Order'Numbers"0312367 and 0312,450), QA/QC report. and chain-of-custody form are included in Appendix C•. 4.0. SUMMARYAND CONCLUSIONS ' r Based on the data collected during this monitoring period, AGE concludes: • -Ground water elevations at'the site ranged from 25:51, feet above MSL in we11 MW-8 to ' 26.45 feet•above MSCin well MW-L-Ground water levels were within the screened-intervals of all the monitoring'wells on-site. The ground water at the site was inferred to be flowing toward the north-under.an average gradient,of 0.005 feet/feet which is consistent with the ' • 'flow direction determined during previous monitoring'events. •` TPH-g; BTEX and MTBE were'not detected at or above laboratory reporting limits in the water samples collected from the monitoring,wells and domestic water well on-site this ' uarter. Itis the first time since sampling'began that benzene has not been detected in well ` MW--5 acid thea first time.in'the pat four sampling events that benzene was not detected in - '' well MW-2. , • The lateral extent of petroleum hydrocarbon'impacted ground water.has been'defined. 5.0. = RECOMMENDATIONS , Based'on the'firidirigs•of this investigation, AGE,recommends: ' Continued quarterly monitoring of the ground water,monitoring wells.-The next monitoring event'should be performed in March 2004; and Preparation of a work'plan,.tq further,define the petroleum Hydrocarbon-impacted ground' water, as directed by Sari Joaquin County'EHD.letter,dated, 03 December 2003. Advanced GeoEnvironmentsl,Inc.