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r <br /> September 12, 1991 A M <br /> ARCO Station No. 2076, Lodi, California -- <br /> "° C NCL I NS <br /> Utilizing the vacuum and distance measurements obtained during the VET, an effective <br /> radius of influence can be estimated for the site. The effective radius of influence is defined <br /> as the radial distance from a vapor-extraction well within which recorded vacuum levels <br /> indicate that subsurface air now rates are sufficient for remediation. RESNA estimates that <br /> a wellhead vacuum of 10 inches of water at a flow rate of50orm will <br /> res It in an f feused <br /> radius of influence of approximately 30 feet (Plate 2). p <br /> for remediation at the site should be installed at distances less than 60 feet apart. Based <br /> upon the VET data, RESNA concludes that vapor extraction is a feasible method of <br /> r remediating soil at this site. The radius of influence estimated above can be further refined <br /> and the remediation time frame can be initially estimated as additional subsurface <br /> environmental investigations are performed. <br /> Additional analytical data will be obtained when the existing gasoline storage tanks and <br /> product lines are removed. These tasks will evaluate the need for further assessment at the <br /> site. If analytical results of soil samples collected during the tank removal indicate no <br /> further assessment is warranted, no remedial tasks will be conducted at he site. If residual <br /> hydrocarbons are detected at levels requiring remediation, we plan to install a VES after <br /> the hydrocarbon plume is defined in a subsequent environmental investigation. The <br /> ,,. <br /> distribution and concentrations of hydrocarbons delineated from subsequent investigations <br /> would be used to determine applicable vacuum and flow rates before selecting a treatment <br /> device. <br /> Therms! oxidation, catalytic oxidation, activated carbon adsorption, and destruction by an <br /> internal combustion (IC) engine are possible alternatives to control off-gas emissions and <br /> are approved by the San Joaquin Air pollution Control District. if soil remediation at the <br /> ET <br /> subject site becomescarbon or a catticollected <br /> ly#c oxdi er w ll provthe <br /> for hmost suggests <br /> t econmical off-gas <br /> use of activate <br /> treatment. <br /> -- <br /> O9t2cCAR 3 <br /> MMS-4 <br /> w <br />