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ti ' 08 August 2005 AGE-NC Project No 98-0534 ' Page 10 of 15 `S • 28 January 2005-ground water levels measured at MW-1 through MW-8 averaged 8 6 feet ' below the tops of the well casings (above yet near the screened interval) On 17 February, monitoring well MW-9 was purged and sampled for the chemicals of concern All monitoring wells were accessible during the monitoring event,the calculated ground water flow direction was Inferred to be northeast across the former UST area at a gradient of 0 02 ft/ft TPH-d and BTEX compounds were not detected In the ground water samples collected from the wells Hydrocarbons and fuel additives were not detected in the sample from monitoring well MW-9 TPH-g was detected in the ground water samples collected from well MW-4 at a concentration of 100µg/1,detected in the ground water samples MTBE was ' detected by EPA Method 8260 In the samples from wells MW-4, MW-6 and MW-8 at concentrations of 25 µg/l, 7 4 µg/l and 2 1 µg11 , respectively No other fuel oxygenates were detected In any of the samples Ground water elevations are summarized in Table 3, analytical results of ground water samples are summanzed in Table 4 ' 01 April 2005-On 01 April 2005,monitoring well MW-9 was sampled TPH-g,TPH-d and BTEX compounds and fuel additives Including MTBE were not detected In the ground water ' 0 sample collected from the well Ground water data Is summarized in Table 3, analytical results of ground water samples are summarized in Table 4 ' • 15 June 2005 - ground water levels were measured at wells MW-1 through MW-9 and averaged 9 5 feet below the tops of the well casings(above,yet near the screened Interval), the ground water was Inferred to be flowing to the north across the former UST area at a ' calculated gradient of 0 017 ft/ft TPH-d and BTEX compounds were not detected in the ground water samples collected from the wells Hydrocarbons and fuel additives were not detected In the sample from monitoring well MW-9 TPH-g was detected in the ground water I samples collected from wells MW-4 and MW-6 at a concentration of 100 µg/1 and 120µg/l, respectively MTBE was detected In the samples from wells MW-3 though MW-6 at Cyd9 concentrations of from 5 5 µg/1 to 130 µg/l, respectively No other fuel oxygenates were YYX ' detected in any of the samples Ground water elevations are summarized in Table�' analytical results of ground water samples are summarized in Table 4 Field data logs are provided in Appendix C The laboratory report(CTEL Project No CT214-0506150),quality assurance/quality control report and chain of custody form are Included in Appendix D GeoTracker confirmation pages of the submitted laboratory electronic deliverable format (EDF) files are included in Appendix E r 24 REGIONAL GEOLOGIC SETTING . The site is located within the northern San Joaquin Valley which comprises part of the Great Valley Advanced GeoEnvironmental,Inc