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ga <br /> c <br /> J. H. KLEINFELDEK & ASSOCIATES <br /> Initially, we recommend that all monitoring wells (MW-1 through MW-7) be <br /> sampled and analyzed for total petroleum hydrocarbons (TPH); benzene, <br /> toluene, xylene (BTX); and general minerals. General minerals results <br /> f will be particularly useful in design of the treatment system through <br /> identification of ions that may pose technical difficulties in the <br /> m <br /> on. Additionally, analytical results from <br /> operating phase of remedial acti <br /> monitoring well MW-2 will help characterize background water quality. <br /> f, <br /> ie <br /> This background data will be utilized in comparison with treated water to <br /> verify treatment system performance (see Section 3.9)• <br /> f,n <br /> Chemical analyses from ground water samples collected on August 13, 1985; <br /> ya November. 15, 1985; and September 8, 1986 have provided sufficient data to <br /> i support the following recommendations: <br /> t 1. Monitoring well MW-5 should be sampled and analyzed on a <br /> quarterly basis for TP11 and BTX. <br /> 2. All other monitoring wells (MW-1 to MW-4, MW-6, and MW-7) should <br /> be sampled and analyzed on a monthly basis for TPH and BTX, <br /> Although minor concentrations of toluene have been detected in monitoring <br /> 3� well MW-5 samples, it appears that these concentrations are unrelated to <br /> 1A the hydrocarbon plume identified to the east. This is supported by a <br /> �s southeast ground water gradient and non-detectable values for BTX from <br /> 1a <br /> ground water samples .collected from monitoring wells MW-3 and MW-6, (see <br /> Figure 3.2.1). The monitoring of all monitoring wells (excluding MW-5) on <br /> BTX will enable JHK&A to systematically <br /> a monthly basis for TPH and <br /> document the hydrocarbon plume configuration and monitor treatment system <br /> effectiveness. The sampling and analyses of monitoring wells MW-3 and <br /> MW-6 may eventually be rescheduled to quarterly monitoring if ground water <br /> wells are outside the zone of,influence <br /> modeling suggests that these <br /> i imposed by the remedial actions. <br /> �a <br /> Ground water elevation measurements will be conducted during each sampling <br /> T - - i ' -- - - ------ ----- - ------ — --- <br /> round, These data are used to identify <br /> fluctuations-in flow- remedial -- - - <br /> �' on of ground water elevation maps. <br /> action influence, and preparati <br /> 7 <br /> 33-83-887 <br />