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4 sf 4 Y qq <br /> -ter <br /> CLEARWATER <br /> G R Q U P, I N C <br /> E,ii ira rr n�ertin! Srrx it es <br /> GROUNDWATER MONITORING RESULTS <br /> Depth to water Ranged from 17 44 to 18 18 feet below top of well casings <br /> Flow direction/gradient Generally northwest at approximately 0 0086 ft/ft <br /> SPH - thickness/wells None <br /> Benzene concentration range <0 5 µg2(MW-1, 4, 6)to 120 µg/L (MW-4) <br /> MTBE concentration range <0 5 µg/L (MW-1, 5, 6) to 8 µg/L (MW-2) <br /> TPHg concentration range <50 µg/L (MW-1, 3,4, 6) to 27,000 gg/L (MW-2) <br /> DO concentration range <0 1 mg/L(MW-2) to 0 4 mg/L (MW-5, 6) <br /> Remarks Groundwater flow direction and gradient is generally consistent with previous measurements Water <br /> sample analytical results are generally consistent with previous results <br /> PROJECT STATUS <br /> A Clearwater Group Inc workplan dated August 19,1997, for site remediation was approved by the San Joaquin <br /> County Public Health Services in a fax dated September 29,1997 Natural bioremediation of the site is to be <br /> enhanced by the injection of 1,000 pounds of oxygen release compound, into the contaminated groundwater plume, <br /> via ten geoprobe borings This work will proceed after pre-approval is granted by the California State UST fund <br /> Concurrent with a quarterly event and prior to ORC injection, water samples collected from MW-2 and MW-3 will <br /> analyzed for hydrocarbon degraders,total heterotrophs,and nutrients Also the pilot vapor test wells(VW-1 and VW- <br /> 2) and the pilot air sparge test wells will be water sampled for TPH-gasoline and BTEX, to gather further <br /> contaminant data for targeting the ORC injections These additional tests were also included in the approved <br /> workplan This work is also pending California State UST fund pre-approval <br /> • ATTACHMENTS <br /> • Site Location Map (Figure 1) <br /> • Site Plan (Figure 2) <br /> • Groundwater Elevation Contour Map- 9119/97(Figure 3) <br /> • Hydrocarbon Distribution Map-9/19/97(Figure 4) <br /> • Groundwater Elevations and Analytical Results(Table 1) <br /> Clearwater Well Gauging Data/Purge Calculations and Well Purging Data <br /> • Laboratory Report and Chain-of-Custody Form <br /> CGI No D-101 3Q97 2 November 18, 1997 <br />