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• <br />\~ <br /> <br />Pink Gneiss Pit. The chaser solution will drive the nutrients into a "plume" azougd the injection ""~ <br />~~ ~ ~~~ <br />well, and also help prevent biofouling azound the well casing. u~ o- <br />As mentioned eazlier, the injection well and the initial sampling well aze proposed to be BF-7. 7~ ~v~• <br />The nutrients and chaser solution will be injected through BF-7, and the test water will <br />subsequently be drawn from the same well. This type of test, which is called a "push-pull" test, <br />will m;n;m;ze the cost and may be adequate for evaluation of the results. However, based on the <br />',C <br />initial results, one or more additional sampling wells may be required to monitor the ~~' <br />N~ <br />downgradient migration of the treatment solutions and their effects within the Pink Gneiss Pit. If ~i T" <br />additional wells aze required, samples will periodically be withdrawn from the sampling wells /~ <br />and analyzed for the concentrations of tracer, residual nutrients, and reactio~roducts. ,Fytr~`~ <br />a ~,.~ ~; V <br />Rate coefficients can be calculated by integrating the reactants consumed and products formed ~~`"' ° ~ ~`r `''- <br />within the pit for the duration of the test. The masses of reactants will be divided by the effective <br />residence time for the treatment solution as determined by the tracer concentration. From these <br />calculations the in situ sulfate reduction rates and efficiency will be calculated, which will <br />determine the initial mass of organic cazbon needed to obtain the necessary sulfate reduction in <br />the West Pit. In addition, constituents which may be released initially during reductive <br />dissolution, such as manganese, fluoride, and silica, will be monitored for subsequent <br />precipitation and removal during the test. The test will end when sufficient data has been <br />obtained to adequately assess the feasibility of in situ treatment. <br />At the end of Task 2 the in situ sulfate reduction system will be ready to operate. Prepazation for <br />operation will include hydraulic tests that precisely identify flow rates, residence time and <br />reactive volumes. During this task an SMI field engineer will be on site to modify the design as <br />necessary to fit the site constraints and still meet the requirements of the test design. <br />Task 3: <br />During Task 3 monthly site visits by SMI will be required to obtain field measurements of <br />system chemistry and to obtain samples for a full suite of chemical and microbiological testing. <br />~ J <br />G <br />Bane Mountain Resources Shepherd Mi!/er, !nc <br />Ilgranitclpdrive17001671repoKSldmglattachmeNb.doc 7 June B,/999 <br />