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Y <br /> 27 November 2000 <br /> AGE-NC Project No 97-0343 <br /> Page 3 of 4 <br /> Benzene was detected in the three water samples at concentrations ranging from 1 5 ,ug/l In MW3 <br /> to 10 µg/l in MW1 Toluene, ethylbenzene and xylenes were also detected in the three samples at <br /> concentrations as high as 370µgd(xylenes in sample MW1) Fuel oxygenated compounds were not <br /> detected above laboratory reporting limits in the ground water analysis <br /> The analytical results of water samples collected In July 2000 are summarized on Table 2 The <br /> rlaboratory report (MAI Lab I D No 51736-51738), QA/QC report and chain-of-custody form are <br /> Included In Appendix B <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> rBased on the data collected from the site, AGE finds <br /> • Ground water flow at the site was determined to be toward the t northeastt a low <br /> gradient of 0 0035 feet/feet Ground water elevations at the site decreas rage of 4 88 <br /> feet since the July 2000 monitoring event The significant fluctuation in depth to ground <br /> water and relative ground water elevation at the site over the past two quarters is potentially <br /> Influenced by the nearby Stockton Diverting Canal <br /> I • Concentrations of TPH-g and BTEX compounds increased In well MW1 and decreased in <br /> wells MW2 and MW3 since the July 2000 monitoring event Concentrations of TPH-d <br /> decreased in well MW3 and Increased In well MW 1 since the July 2000 monitoring event <br /> The ground water sample collected from MW2 was not analyzed for TPH-d, the sample <br /> container broke in transit to the laboratory Fuel oxygenates were not detected in the ground <br /> water samples collected at the site <br />' S.O. RECOMMENDATIONS <br /> Based on the findings of the environmental activities recounted In this report, AGE recommends <br /> • Continued quarterly monitoring of the ground water monitoring wells on-site The next <br /> monitoring event should be performed in January 2000 <br /> • Installation of additional monitoring wells to define the lateral extent of impacted ground <br /> water A work plan to define the lateral extent of impacted ground water has been submitted <br /> to and approved by San Joaquin County PHS-EHD AGE anticipates the work will be <br /> performed in December 2000 <br /> Advanced GeoEnvironmental,Inc <br />