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loom, NOW-14 <br /> 4 <br /> Mr. Jeff Werner <br /> October 5. 1990 <br /> Page 4 <br /> At Geweke's request. Brown and Caldwell will evaluate various options for their applicability <br /> and cost effectiveness to the subject property. Site-specific factors such as type of soil, type <br /> of hydrocarbon, hydrocarbon concentration, depth to groundwater, extent of contamination, <br /> and above ground site constraints will be considered in determining the applicability of each <br /> technology. The various trearment alternatives will. also be evaluated for their effectiveness <br /> in contaminant removal,capital and operating costs, and permitting requirements. Based on <br /> this evaluation, Brown and Caldwell will design what we believe is the best treatment system, <br /> present a cost estimate, and make any other necessary recommenciations to Geweke for their <br /> review. Following Geweke's approval, the design criteria will be submitted to the Board for <br /> their approval in the form of a remedial action plan. <br /> A method of disposal for the treated water will also have to be established_ Possibly, a <br /> National Pollutant Discharge Elimination Systems (NPDES) permit will have to be obtained. <br /> Brown and Caldwell will review opticns for the disposal of treated water and make <br /> recommendations regarding water disposal in the remedial action plan. <br /> Instal!ation and Startup of a Groundwater Treatment System <br /> t Following approval of the remedial action plan by Geweke and the Board, Brown and Cald- <br /> weil will arrange for purchase and installation of an interim groundwater treatment system <br /> following the recommended design specifications. All necessary permits will be obtained <br /> prior to start-up. Installation of the treatment system may include set-up of an operable <br /> treatment unit, and installation of piping and tanks for holding and/or transporting the <br /> groundwater after treatment. <br /> Once the treatment system is instar-led, a sec-up period is necessary. During set-up, any <br /> portion of the system that is not functioning properly is replaced or adjusted. Motors,pumps, <br /> and piping are checked to insure that they are functioning properly. In-flow and out-flow <br /> rates are calibrated, monitored, and recalibrated to insure that the system is working under <br /> optimum conditions. During set-un, samples of the water into and out of the system are anal- <br /> yzed to insure that clean-up specifications are met. Following the initial set-up period, <br /> periodic checks to see that the system is working as efficiently as possible are recommended. <br /> Installation of Additional Wells <br /> As mandated by the August 31, 1990 letter froin,the Board (Attachment B), it is necessary <br /> to continue the groundwater investigation at the:object site to adequately determine the extent <br /> of contaminant migration. As indicated on Figure 2.MW-6 and N*W-2 adequately define the <br /> extent of the plume to the north and east of the subject property respectively. Brown and <br /> Caldwell proposes installing four additional off-site groundwater monitoring wells to.deflne <br /> the extent of groundwater contamination to the south and west. Proposed well locations are <br /> presented on Figure 2. The locations of these wells are approximate and based on data needs. <br /> However the final locations of these wells will be determined based on the feasibility of <br /> obtaining permission to install wells on particular off-site properties. <br /> :..,own and Caldwell <br /> �.C'lsu'tart5 <br />