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for removing gasoline range contaminant from both the soil and <br /> ground water. By converting monitor well MW-10 into a vapor <br /> extraction well and connecting it and the PVC risers that were <br /> placed into the tank excavation (to the 25 foot depth) to the <br /> vapor extraction system, the contaminated soil from beneath the <br /> tank excavation down to and including the capillary fringe will be <br /> subjected to vapor extraction. The free floating product that has <br /> again shown up in monitor well MW1 can also be removed by <br /> connecting this well to the vapor extraction system. Vapor <br /> extraction should not only help collect/capture any free floating <br /> product that is available that skimming could not collect, but <br /> also treat the vadose zone from the base of the tank excavation to <br /> top of ground water beneath the contaminant source, UST's. Vapor <br /> extraction is felt to enhance the native bacterial population, in <br /> regards to supplying oxygen to the vadose zone, thus encouraging <br /> natural bio-degradation, particularly of hydrocarbons, "Various <br /> talks on Vapor Extraction during Hazmacon April 17-19, 1990, <br /> Anaheim, California, see Volume II , Measurement, Treatment, <br /> Minimxzatin and Control Technologies" . Observations made by WEGE <br /> at other sites using vapor extraction support this method of <br /> remediation. <br /> 4.2 PUMP TEST PROCEDURES <br /> A one week, 7 day, pump test will be conducted as follows : <br /> RECOVERY WELL MW-3 <br /> BORING DIAMETER 0.83 FEET <br /> BORING DEPTH 65 FEET BELOW THE SURFACE <br /> CASING DIAMETER 4 INCH <br /> SLOT INTERVAL 35 FEET TO 65 FEET BELOW THE SURFACE <br /> SLOT SIZE 0.020 INCH <br /> SAND PACK TYPE #3 MONTEREY SAND <br /> AVERAGE WATER DEPTH 53 FEET BELOW THE SURFACE <br /> RECOVERY WELL MW-1 <br /> BORING DIAMETER 0.66 FEET <br /> BORING DEPTH 65 FEET BELOW THE SURFACE <br /> CASING DIAMETER 2 INCH <br /> SLOT INTERVAL 35 FEET TO 65 FEET BELOW THE SURFACE <br /> SLOT SIZE 0.020 INCH <br /> SAND PACK TYPE #3 MONTEREY SAND <br /> AVERAGE WATER DEPTH 52 FEET BELOW THE SURFACE <br /> OBSERVATION WELLS MW2, MW4, MW5 , MW6 , MW7, MW8 , MW9 & <br /> MW10 <br /> Prior to pumping, a pressure transducer will be placed in monitor <br /> well MW8 near the 65 foot depth and hooked to a continuous <br /> 7 <br />