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9101 <br /> 1 <br /> 5. Minor sail contamination exists in monitor well MW-9 at <br /> 30 and 45 fact below the surface but is contaminant free <br /> trnm 50 feet to 65 feet below the surface. <br /> monit1 <br /> 6 HW-10 from Significant40sfeet ctotnation 501feet belowsts theysurface. well <br /> I <br /> 7, EDB does not exist in the soil or ground water beneath <br /> this site. <br /> a Test performed on the monitor <br /> £s. A Bouwer and Rice , <br /> wells of this site _-cates hydraulic conductivities, <br /> l "K", and velocities, "V", of a silty to fine clean sand <br /> aquifer with an effective porosity of 22%. <br /> 4 <br /> 5.0 RECOMMENDATIONS <br /> 1, Obtain the permit to discharge treated ground water in <br /> to the City of Stockton sewer. <br /> 2. Manifold monitor well MW-10 to the treatment area for <br /> use as a vapor extraction well. <br /> E <br /> .lot test usin a RSI S.A.V.E. (SPRAY; <br /> 3, Perform a p g <br /> AERATOR; VACUUM, EXTRACTION) system to treat the ground ; <br /> water and extract and destroy the gasoline range vapors. E <br /> 4, Obtain the necessary permits from San Joaquin County Air k <br /> Quality (Permit to Construct and Operate the system). V <br /> g, During the August quarterly sampling of the site, obtain <br /> $ ground water samples for the "fecal coliform" analysis <br /> as requested by the San Joaquin County Public Health }' <br /> ! Service letter dated June 8, 1990, in addition to the . <br /> regularly scheduled TPH and BTEX analysis. <br /> 6. During the pilot test for the RSI S.A.V.E. system, ; <br /> perform a 120 hour aquifer test. , . <br /> 6.0 AQUIFER TEST <br /> j <br /> E <br /> 6.1 PUMP TEST PROJECTIONS <br /> 1 <br /> The pump tett will be conducted on monitor well 1141-3. However, <br /> i <br /> prior to performing the test on the aquifer, projections must be <br /> made an what pump rate is to be used. Using the "Jacob's method" <br /> equations found on pages 38, 39, and 40 in "Basis Ground Water <br /> Hydrology", U.S. Geological Survey Water Supply Paper 2220, 1984, <br /> both pump rate and drawdown for monitor well MW-3 were calculated. <br /> WEGE recognizes that the Jacob s method is only suitable under <br /> steady-shape . conditions and that homogeneous blanket aquifers are <br /> i <br /> assumed, which is not the case here. However, some assumptions <br /> must be made to have a starting point for the aquifer test. <br /> 26 <br /> `r <br /> r <br />