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StS w. r control over continued- migration and provide for continuous collection of accumulated free product. Due to difficulties in obtaining an above ground storage tank permit the existing northern tank storage underground g "' g (unleaded) was used to contain the recovered product from the bailingand pumping programs. Table 3 presents a summary of product recovery through August 26,, 1986, from monitoring wells 1, 3 and 4. To date, a total of about 435 gallons has been recovered. A sample of the recovered product was analyzed for total lead by EPA method 7421 to confirm that ... the product loss was unleaded gasoline. The results indicate. a .27 mg/l (ppm) concentration which suggests that the recovered «k product is an unleaded fuel because leaded fuel typically has a lead concentration in excess of 1 ppm. The groundwater pumped from well 4 is piped below grade to a water treatment compound located at the southwest property corner. The Initial Abatement System Plan , Figure 11, shows the s layout of the pumping and water treatment systems. i x, WATER TREATMENT t r' A .water treatment system was installed so that the contami- nated groundwater pumped from monitoring well 4 could be dis- charged to the sanitary sewer. To expedite start-up of the pumping system, the Pumped p groundwater is initially being treated ' " by a carbon filtration unit to reduce the concentration of .: dissolved hydrocarbon components. A 400 gallon capacity carbon „ tank capable of handling flow rates of up co 20 gallons per minute was installed to treat the pumped water. The treatment system effluent is being discharged to the sanitary sewer system f^1 on Waudman Avenue under a permit from the Stockton Municipal Utilities Department. Z i 71 i 23