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Mr. Philip Isorena Proposal P93-040.31 <br /> July 12, 1993 <br /> Page 9 <br /> Iron <br /> Total microbial count <br /> Petroleum degrading microbial count <br /> After reviewing the analytical results, we will evaluate the potential for biodegradative <br /> activity occurring at the site and its possible relationship to the apparent contaminant <br /> migration rate. The data obtained from this study will also be used to determine <br /> techniques which may be used to increase the natural degradation rates. <br /> Task 10. Aquifer Testing <br /> Aquifer testing consisting of slug tests and bail down tests will be conducted to obtain <br /> preliminary information on aquifer parameters,product distribution,and potential recovery <br /> rates. These data can be used to design subsequent aquifer pumping tests and evaluate <br /> product recovery methods. The proposed slug testing and bail down procedures are <br /> described in the following two sections. <br /> Slug Testing. Slug tests will be performed in selected groundwater monitoring wells to <br /> obtain preliminary values of aquifer parameters for estimating the contaminant migration <br /> potential. The specific number of slug tests will be based on the results of the results of <br /> the CPT and HydroPunch sampling program. A selected number of wells will be <br /> incorporated into the slug testing program based on variations in stratigraphy (amount and <br /> distribution of sands). The slug tests will provide an order-of-magnitude estimate of <br /> hydraulic conductivity of the aquifer material immediately adjacent to the screened <br /> section. Parameters from the slug tests can be extrapolated to the surrounding area and <br /> can be input to various analytical equations (e.g., Theis) to assist in planning and <br /> designing subsequent aquifer tests. The design parameters include estimated maximum <br /> drawdown, discharge rate, duration of pumping, and cone of depression radius. The <br /> feasibility of conducting a long-term pumping test can be determined based on an <br /> estimate of hydraulic conductivity from the slug test. <br /> Bail Down Tests. A bail down test of floating product will be performed in <br /> groundwater monitoring wells containing a minimum of 0.2 to 0.3 foot of free product <br /> to evaluate the true thickness of free product on groundwater. Bail down tests will be <br /> conducted on three wells (PS/MW-14, ST/MW-1, and TS/M-2) that contained product <br /> thicknesses greater that 0.2 foot during the September 1992 synoptic water level <br /> measurement event. Additional bail down tests will be conducted if free product, in <br /> excess of 0.02 foot, is detected in wells during the 1993 monitoring and reporting <br /> program. <br /> SAC/PRMM304031.bc-93 1mc:5 <br />