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we' Y PROPOSED GROUND WATER RECOVERY The proposed recovery well will be drilled 60 to 70+ feet deep to allow a draw down of 10 to 15'+. This will produce a radius of influence of about 25' or more. _See Plate No. 5. The location selected for the recovery well is near the east end of the contaminated zone between B-7 and B-9. This conforms with prior drilling data. During excavation of the tank hole, no differences in soils were noted that might cause a large lateral migration of product in any direction except downward. One submersible pump of . l-/2-horsepower will be .installed in the well ' to pump at. a rate of. 2 to 20 g.p,m: and will be cycled and/or valved to control the flow. The expected flow is 5 to 10 gpm. It will also be equipped with high/low on/off controls. In addition, a gasoline sensor float, which is normally closed, will - be set just below the pump off sensor to detect gasoline on the surface of the well. This sensor will shut down the system if a gasoline layer of a few inches builds up in the well. Gasoline build-up in the well is expected to be minimal. It will be ramoved by a second pump which is installed as needed. A. 1000-gallon tank 'will .be use&, to separate gas/water prior to being -fed to the stripper. Water for the stripper will be supplied by a second 1/4-h.p. pump at a rate of 1 to 20 g.p.m. Since the treatment process may require more than one pass of the water through the stripper. A facility will be provided for injection of chemicals to control algae growth. STRIPPING TOWER The proposed stripping tower includes a 18" diameter pipe �. and contains 16 feet of .Yaeger Tri-Pak 2" spheres. 270 cubic feet of air will be supplied by a Dayton High Pressure Blower capable of delivering 270 CFM at 1" of water. The spray nozzle is a Bete Fog Nozzle, 1200 full cone, No. TF 10 FC delivering 2 GPM at 10 psi. and a TF ;16 FC delivering 5.3 GPM at 10 PSI. See Tower calculations attached and Plate No. 6. 4` The 1,000-gallon tank will be equipped with (l) a relay to shut the well pump off when 958 level is reached; (2) a sensor to detect gasoline on the surface which will shut the system down if ' 1" to 2" of gasoline collects; and (3) on/off sensors for the stripping tower pump set at 90% full: ON, 508 full: OFF. To start the operation, the water will be pumped directly to the stripping tower and the finished water stored in the 1,000- gallon tank to check water quality. Both the inflow and discharge will be tested daily the first few days to establish the l efficiency of the stripper. After the operation is established, testing would be reduced to weekly, then monthly as permitted by ---------- the - -7-