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' 31 August 2000 • AGE Project No 96-0232 ' Page 3 of 25 ' (mg/kg) Grab ground water samples collected from P1 at depths between 23 to 27 feet bsg and 46 to 50 feet bsg contained MTBE at concentrations of 410 and 72 µg/1, respectively, tert-butanol (TBA)was detected in the same water samples at concentrations of 25 µg/1 and ' 11 µg11, 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 Based on soil composition data obtained from the soil bonngs, cross sections A A'and B-B'were constructed depicting the general subsurface soil composition on-site and off-site(Figures 3 and 4)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 ' 24 February 1998- Ground water morutonng was performed on wells MW-1, MW-2 and MW-4 General ground water flow direction was reported towards the northeast at a gradient ' of 0 01 Laboratory analysis of groundwater samples collected from wells MW-1, MW-2 and MW-4 detected MTBE at concentrations of 470µg/1,200µg/1 and 5 6µg/l,respectively 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 • 29, 30 June 1998- One ground water monitoring well (MW-5)was installed on-site and two I ground water monitoring wells (MW-6 and MW-7)were installed off-site Monitoring well MW-5 was advanced to a depth of 25 feet bsg, MW-6 advanced to a depth of 48 feet and MW-7 advanced to a depth of 241/2feet bsg Laboratory analysis of soil samples collected I from MW-6 and MW-7 did not detect TPH-g,TPH-d,BTEX or fuel oxygenated compounds 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 I0 06 July 1998 - Ground water monitoring was performed on wells MW-1, MW-2, MW-4, MW-5, MW-6 and MW-7 General ground water flow direction was reported towards the west-northwest at a gradient of 0 003 Laboratory analysis of ground water samples detected MTBE at concentrations as high as 810µg/1 and dissolved TPH-d concentrations as high as 280 µg/1 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 • 10 November 1998 - Ground water monitoring was performed on wells MW-1, MW-2, MW-4, MW-5, MW-6 and MW-7 General ground water flow direction was reported towards the north at a gradient of 0 01 Laboratory analysis of ground water samples detected MTBE at concentrations as high as 1,200µg11, dissolved TPH-d was detected in the sample I collected from MW-6B at a concentration of 240 4g11, dissolved TPH-g was detected in the MW-1 sample at a concentration of 480 µg/1 A report of findings (Quarterly Report- November 1998, dated 27 January 1999)was prepared by AGE and submitted to the PHS- I EHD and the RWQCB • 25 February 1999-Ground water monitoring was performed on wells MW-1, MW-2, MW- 4, MW-5, MW-6 and MW-7 General ground water flow direction was reported locally Advanced GeoEnvlronmental,Inc I