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r -7- Bioventing Figure 7 is a schematic of the bioventing system that we plan to install in Alden Park. Water and oil are pumped out of the well with a submersible pump. The water and oil are separated and the water is discharged to the sanitary sewer . At the same time, the vacuum pump pulls air through the soil to promote biodegradation. Figure 8 shows the existing monitoring wells from the site assessment work. The solid circles are wells where flowing oil has been observed. The open circles are wells where flowing oil has not been found. The shaded zone shows the area where liquids pumping and bioventing will be used to immobilize flowing oil . Mitigation Schedule The liquids pumping and bioventing system will be installed in two parts. Initially, we will add the liquids pumping equipment to our existing bioventing well . We will begin mitigation with this well in early 1989. We will use this operating experience to fill in the gaps in the data that we need for design of the full-scale system. We will also demonstrate the equipment that treats the recovered groundwater before it is discharged to the sewer . Soon after the first mitigation well is started, we will begin the design of the full-scale system. The full-scale system will include about 10 to 25 wells. It will be installed in mid-1990. We may need to construct additional block buildings to house the vacuum pumps and other equipment for these wells. We will mini- mize the number of buildings required, and we will design them to be aesthetically pleasing. Monitoring Program We are currently discussing the details of the monitoring plan with the Regional Water Quality Control Board. The plan will assess water quality in the Alden Park area. It will be docu- mented as part of the work plan. we will use existing monitoring wells. We will use EPA-approved procedures to measure volatile and semivolatile organics in groundwater samples .