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REGAL 603 8/16/91 <br /> floating product that is available that skimming could not <br /> collect, but also treat the vadose zone from the base of the tank <br /> excavation to top of ground water beneath the contaminant source, <br /> USTI's. vapor extraction, is felt to enhance the native bacterial <br /> poyu.ation, in regards to supplying oxygen to the vadose zone, <br /> thus encouraging natural bio-degradat4on, particularly of <br /> hydrocarbons ("Various talks on Vapor Extraction during Hazmacon <br /> April 17-19, 1990, Anaheim, California, see: Volume II, <br /> Measurement, Treatment, Minimizatin and Control Technologies") . <br /> Observations made by WEGE'at other sites using vapor extraction <br /> also support this method of remediation. <br /> 4.3 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 /> OBSERVATION WELLS MW1, MW2, MW4, MW5, MW6, MW7, <br /> MW8, MW9 & MW10. <br /> Prior to pumping, a pressure transducer will be placed in monitor <br /> well MWS near the 65 foot depth and hooked to a continuous <br /> recorded data logger to record differences in hydraulic head to <br /> 0.01 foot accuracy, for a duration of one week prior to pumping of <br /> MW3. This will help establish a base line for the natural <br /> occurring fluctuations that may appear in the ground water <br /> elevation for this time period. During the first week of pumping, <br /> transducers will be placed in monitor wells MW1, MW2, MW3, MW4, <br /> and MW8. Data loggers will be used to continuously record the <br /> ground water fluctuations derived during the pumping of monitor <br /> well MW3 at a pump rate of 1000 gallons/day (0.7 gallons/minute) <br /> for seven days. The pump will be a down hole air pneumatic pump <br /> set at the base of MW3 (approximately the 65 foot depth) . The <br /> recovered water will be piled (1/4" PVC tubing inside PVC pipe to <br /> a sealed sediment collection tank that is vented to the <br /> incinerator. From the sediment trap the ground water will be <br /> sprayed into the "ConVauit" air stripping tank (1000 gallon <br /> capacity) . The ground water hJ11 be tisated and aerated by heated <br /> air jets within the tank for approximately 2.5 hours. All VOC <br /> vapors produced from the aerating will be vacuumed recovered and <br /> destroyed by the "Hirtz" incenerator. Once the 2.5 hour aeration <br /> f <br /> PAGE 11 <br />