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1 <br /> { <br /> 16 March 2005 <br /> AGE-NC Project No. 97-0343 <br /> Page 3 of 3 <br /> • At the time of the December 2004 sampling event, water was not detected in wells MW-1 <br /> through MW-7. Depth to ground water in well MW-8 was 62.61 feet below the top of the <br /> well casing; ground water elevation in well MW-8 was calculated to be 34.55 feet below <br /> MSL (Table 1). <br /> • No petroleum hydrocarbons were detected at or above laboratory reporting limits in the <br /> ground water sample collected from well MW-8. <br /> • The lateral and vertical extents of the hydrocarbon-impacted ground water appear to be <br /> limited to an isolated dissolved mass above well MW-8, within the wells MW-4 to MW-7, <br /> and within the upper reaches of the upper water table, yet under the depth of the dry well <br /> casings. The nature of the water table at the site is controlled by the seasonal rise and fall of <br /> the water recharge collection basin, which is possibly interconnected with the volume and <br /> frequency that surface water fills or travels through the Stockton Diverting Canal north of <br /> the site. The hydrocarbon-impacted soil at the water table may likely be directly impacting <br /> the fluctuating ground water as described above, therefore, soil remediation should cause a <br />' direct reduction in the dissolved plume concentrations. <br /> 5.0. RECOMMENDATIONS <br />' Based on the findings of the environmental activities recounted in this report, AGE recommends: <br /> • Continued quarterly monitoring of the on-site ground water monitoring wells. The next <br />' monitoring event should be performed in March 2005. <br /> • Operation of an interim soil vapor extraction remediation system utilizing wells MW-1, <br />' MW-2 and MW-3. <br />' 6.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br />' environmental consultants practicing in this or similar localities. The findings were based upon <br /> analytical results provided by an independent laboratory.Evaluation of the hydrogeologic conditions <br />' at the site for the purpose of this investigation was made from a limited number of available data <br /> points(e.g.,ground water samples)and subsurface conditions may vary away from these data points. <br /> No other warranty,expressed or implied,is made as to the professional interpretations,opinions,and <br /> recommendations contained in this report. <br /> IAdvanced GeoEnvironmcntal,Inc. <br /> I <br />