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r k J, 19 June 2000 AGE-NC Project No 96-0232 Page 5 of 35 • August and September 1997- Four soil borings (P1, P2, P3 and P4) were advanced on-site to maximum depths of 70 feet bsg and one soil boring (P5) was advanced off-site at 14659 Thornton Road (Rocky's Restaurant) to a depth of 60 feet bsg Soil boring locations are depicted in Figure 2,boring logs for P1,P2,P3,P4 and P5 are in Appendix B,data collected from soil borings P1,P2,P3,P4 and P5 were plotted on geologic cross sections A-A 'and B- B'and are depicted in Figures 9 and 10 MTBE was detected from the P 1-35 foot soil sample at a concentration of 0 14 mg/kg Grab ground water samples collected from P1 detected MTBE at depths between 23 to 27 feet bsg and 46 to 50 feet bsg at concentrations of 410 and 72 µg/l, respectively, tert-butanol (TBA) was detected in the same water samples at concentrations of 25 µg11 and I 1 µg/l, respectively A grab ground water sample collected from P5 at a depth between 21 and 25 feet bsg contained MTBE and TBA at concentrations of 100 µg/1 and 6 6 µg/1, respectively Analytical results of soil and grab ground water samples are summarized in Tables 4 and 6 A report of findings (Quarterly Report - September 1997, dated 16 October 1997)was prepared by AGE and submitted to the PHS- EHD and the RWQCB-CVR • February 1998 - Ground water monitoring was performed at wells MW-1, MW-2 and MW-4 Ground water depths were recorded at approximately 3 feet bsg. (Table 3), general ground water flow direction was towards the northeast at a gradient of 0 01 (Figure 11) Laboratory analysis of ground water samples collected from wells MW-1,MW-2 and MW-4 detected MTBE at concentrations of 470 µg/1,200µg/1 and 5 6 µg/1,respectively Analytical results of ground water samples are summarized in Table 5 A report of findings (Quarterly Report - February 1998, dated 05 June 1998) was prepared by AGE and submitted to the PHS-EHD and the RWQCB-CVR • June 1998- One ground water monitoring well (MW-5) was installed on-site at a depth of 25 feet bsg and two ground water momtonng wells (MW-6 and MW-7) were installed off- site to depths of 48 feet and 24'/2 feet bsg,respectively As-built well construction diagrams of MW-5, MW-6 and MW-7 are depicted in Figures 12, 13 and 14, boring logs of MW-5, MW-6 and MW-7 are in Appendix B,the soil data collected from MW-5, MW-6 and MW-7 were plotted on geologic cross sections A-A ' and B-B' depicted In Figures 9 and 10 Laboratory analysis of soil samples collected from MW-6 and MW-7 did not detect TPH-g, TPH-d, BTEX or fuel oxygenated compounds Analytical results of soil samples are summarized in Table 4 A report of findings(Quarterly Report-July 1998, dated 24 August 1998) was prepared by AGE and submitted to the PHS-EHD and the RWQCB-CVR • July 1998-Ground water monitoring was performed at wells MW-1,MW-2,MW-4,MW-5, MW-6 and MW-7 Ground water depths were recorded at- approximately 10 feet bsg (Table 3), general ground water flow direction was towards the west-northwest at a gradient of 0 003 (Figure 15) Laboratory analysis of ground water samples collected from MW-1, MW-2, MW-4, MW-6A, MW-613 and MW-7 detected MTBE at concentrations as high as 810 µg/1, dissolved TPH-d was detected in samples collected from MW-1, MW-2, MW-5, Advanced GeoEnwonmental,Inc