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t"r <br /> PROBLEM ASSESSMENT REPORT <br /> Moore Petroleum, Inc. <br /> 1399 E. Yosemite Avenue, Manteca, CA <br /> NGA Project No. 10-40480 <br /> Page 15 <br /> A reasonable estimate of the total volume of water necessary to <br /> remove all dissolved hydrocarbons (assuming that hydrocarbons are <br /> riot added to the ground--water system) would be on the order of 3- <br /> 5 pore volumes of water (1 pore volume equaling the total volume <br /> of water contained within the dissolved hydrocarbon plume) . From <br /> examination of Figure 9, a very conservative estimate of the time <br /> required for the removal of 1 pore volume of water would be <br /> significantly less than 200 days. A conservative estimate of the <br /> time required for the removal of 3-5 pore volumes would be on the <br /> order of 600-1000 days. <br /> Treatment of ground water extracted from MW-1A would be by air <br /> stripping. Air stripping would be accomplished by bubbling air <br /> via a small blower through a 350-gallon tank tc remove <br /> hydrocarbons. The 350--gallon tank would allow about 1000 minutes <br /> resident time with a pumping rate of less than 0.35 gpm. This <br /> resident time should be sufficient to allow the removal of <br /> hydrocarbons. <br /> Following approval from the proper local authorities, effluent <br /> ground water from the bubbling tank would be disposed either in the <br /> on-site storm or sanitary sewer. <br /> 6.0 RECOMMENDATIONS <br /> Based on the results of this Problem Assessment Report, NGA <br /> recommends completion► of the following tasks. <br /> • Following issuance of a permit to construct and operate <br /> the soil venting system, implement the proposed soil <br /> venting system. <br /> • Implement the ground-water remediation alternative <br /> described in Section 5.2. <br />