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HIM <br /> 1. <br /> 4.0 AQUIFER TEST (WORK PLAN) <br /> 4.1 PUMP TEST PROJECTIONS <br /> To economically evaluate the site a pump test on the aquifer will <br /> be performed during the start-up operations for the "Hirtz" <br /> Incinerator. <br /> Projections made from the Bouwer and Rice Slug test, presented in t <br /> the May, 1990 report, indicated K values (hydraulic conductivity) <br /> ranging from 7.9 X 10-3 feet/day in monitor well MW-2 to 4.06 , <br /> feet/day in monitor well MW-1. We knot/ that the aquifer is not ` <br /> homogeneous. A aquifer flow velocity contour map has been <br /> generated from the data obtained from the Bouwer and Rice Slug <br /> Test calculations, see Figure 5C. <br /> i <br /> contaminated ground water will be pumped from monitor wells MW-1 <br /> and MW-3 at a total combined rate of 2000 gallons per day (1.4 <br /> gallons/minute) . The pumped water will be treated by air <br /> stripping using the "Convault" with heated air injectors and all <br /> volatile organic compounds, stripped from the ground water, will <br /> be destroyed by incineration by the "Fiirtz" incinerator. A vapor ) <br /> recovery vacuum system attached to MW10 and tank excavation risers <br /> for in-situ vapor extraction will deliver the gasoline range <br /> vapors produced from the vapor extraction system to the "Hirtz" <br /> incinerator for destruction. <br /> A pump rate of approximately 2000 gallons a day (1.4 gallons per <br /> minute) will be maintained from raonitor wells MW1 and MW3 during j <br /> the first week of operation. This will enable us to collect data <br /> from the surrounding wells to establish the needed pump rate for w. <br /> capturing and treating the gasoline range contaminated ground <br /> water. The pumped ground water will be treated by the hot air ° <br /> stripping and then stored in a 15,000 gallon polytank for testing <br /> prior to disposal (approximately 14,000 gallons of treated ground ' <br /> water) . As was discussed in Update Report #3 and Figure 5D a pump <br /> rate of approximately 900 gallons per day should adequately <br /> capture and contain the hydrocarbon plume found beneath this site. <br /> Although pumping of the ground water will prevent the plume from <br /> spreading, to remediate the problem the source :oust be abated. At <br /> this site; as shown in previous monitoring reports, the capillary <br /> fringe and the vadose zone beneath the underground storage tanks <br /> (USTfs) are contaminated with gasoline range hydrocarbons. Also <br /> discussed in earlier reports, free floating product occasionally <br /> shows up in monitor wells HW1, MW3 and MW10. <br /> In-Situ vapor extraction has been shown to be an effective raethod <br /> 6 <br />