Laserfiche WebLink
fa <br /> control over continued migration and provide for continuous <br /> collection of accumulated free product. Due to difficulties in <br /> obtaining an above ground storage tank permit the the existing <br /> northern underground storage tank (unleaded) was used to contain <br /> "s. the recovered product from the bailing and pumping programs. <br /> Table 3 presents a summary of product recovery through August 26, <br /> € Z 1986, from monitoring Wells 1, 3 and 4. To date, a total of about <br /> 435 gallons has been recovered. A sample of the recovered product <br /> was analyzed for total lead by EFA Method 7421 to confirm that <br /> the product loss was unleaded gasoline. The results indicate a <br /> z .l7 mg/1 (ppm) concentration which suggests that the recovered <br /> product is an unleaded fuel because leaded fuel typically has a <br /> f <br /> lead concentration in excess of 1 ppm. <br /> µ� The groundwater pumped from well 4 is piped below grade to a <br /> P� water treatment compound located at the southwest Property <br /> corner. The Initial Abatement System Plan , Figure 11, shows the <br /> r layout of the pumping and water treatment systems. <br /> C <br /> WATER TREATMENT <br /> �-' A water treatment system was installed so that the contami- <br /> nated groundwater-pumped from monitoring well 4 could be dis- <br /> charged to the sanitary sewer. To expedite start-up of the <br /> „ pumping system, the pumped groundwater is initially being treated <br /> by a carbon filtration unit to reduce the concentration of a <br /> W dissolved hydrocarbon components. A 460 gallon capacity carbon <br /> . tank capable of handling flow rates of up to 20 gallons per <br /> minute was installed to treat the pumped water. The treatment <br /> system effluent is being discharged to the sanitary sewer system <br /> on Waudman Avenue.under a permit from the stockton Municipal <br /> Utilities Department. <br /> 17 <br />