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28 February 2005 <br /> . AGE-NC Project No 97-0326 <br />' Page 5 of 6 <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> The following conclusions were drawn from the results of this investigation <br /> • The ground water elevations on 22 December 2004 ranged from 23 26 feet(MW-2)to 24 01 <br /> feet below MSL, the flow direction of first-encountered ground water was inferred to be <br />' toward the south-southeast at gradients of between 0 003 ft/ft and 0 03 ft/ft <br /> • TPH-g and BTEX compounds were detected in ground water samples collected from all <br /> HUs, but the fuel additives MTBE and 1,2-DCA were detected only in HU1 DIPE was <br /> detected only in HU2 Laterally, the highest concentrations of contaminants in HU 1 were <br /> centered around the tank-pit and dispenser areas (Figures 4 and 5), vertically, TPH-g and <br /> BTEX compounds exhibited decreasing concentrations with increasing depth <br />' 0 The vertical extent of ground water contamination may be influenced by downward, vertical <br /> ground water flow between HU1 and HU2, HU2 and HU4, and HU4 and HU6 <br />' 0 The lateral extent and vertical extent of petroleum hydrocarbon-impacted ground water have <br /> not been defined <br /> 5.0. RECOMMENDATIONS <br />' Based on the findings of this investigation, AGE recommends <br /> g <br />' Continuation of the quarterly ground water monitoring program, the next monitoring event <br /> is scheduled for March 2005 <br />' • installation of off-site monitoring wells, pending resolution of permitting and bond issues, <br /> to date,AGE has installed three of the eight monitoring wells proposed in the AGE-prepared <br /> Additional Monitoring Wells Work Plan, dated 26 July 2002 <br /> • Commence weekly removal of free petroleum product from well MW-1 in accordance with <br /> Chapter 16, Section 2722 if the California Code of Regulations,utilizing disposable bailers <br />' If free petroleum product is not detected in two consecutive weekly events the frequency will <br /> be decreased to bi-monthly, this program will be evaluated quarterly <br /> • Preparation of a work plan for interim remediation of petroleum-impacted soil and ground <br /> water <br />' Advanced GeoEnvironmental Inc <br /> 1 <br />