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1 35' <br /> CLEARWATER <br /> 1 G a o U P <br /> Environmental 5erVlee9 <br /> 1 1/2 foot above the top of the screen The well seal consists of 2 feet of hydrated bentomte overlain by approximately <br /> 1 7 feet of cement <br /> AS-1 was built with 2-inch diameter PVC well materials Well screen (0 02-mch slot) was extended from 25 feet <br /> 1 bgs (the bottom of the boring) to 22 feet bgs, and coupled to solid riser pipe extending to the surface The annular <br /> space was filled with Lonestar#3 sand from the bottom of the boring to 1 foot above the top of the screen The well <br />' sea]consists of 2 foot of hydrated bentonite overlain by 18 feet of cement <br /> Following construction, road-boxes were set in concrete above each well Between use, augers were cleaned with a <br /> 1 steam cleaner and samplers were cleaned in an Alconox® wash followed by double rinse in clean tap water Soil <br /> cuttings and auger/sampler rinseate were stored in labeled 55-gallon drums on-site pending appropriate disposal <br /> 1 On March 12, 2002, Clearwater developed both DPW-1 and AS-1 using a submersible electric pump Development <br /> 1 involved the removal of water from each well until such time that each was relatively free of sediment, and pH, <br /> temperature, and conductivity parameters have stabilized All fieldwork was conducted in accordance with <br /> Clearwater's Field Protocols attached <br /> lie <br /> Feasibility Testing Methods <br /> 1 Groundwater Extraction Step-Test DPW-1 <br /> On March 12, 2002, Clearwater performed a brief step-drawdown test on DPW-1, which allowed for rough <br /> 1 determination of sustainable flow rates and specific capacity for the well Groundwater extraction for this site was <br /> only considered for dewatering a portion of the saturated zone in order to expose more contaminated soil for vapor <br /> extraction Longer term pumping tests used to determine hydrogeologic parameters and capture zone were not tested <br /> 1 at this time <br />' The test was performed in steps by pumping water from the well at increasing flow rates using a submersible electric <br /> pump and monitoring depth to water in the pumping well using an electric water sensor The step-test was <br />' performed over the course of approximately 3 hours, with pumping rates ranging from 1 to 2 gallons per minute <br /> (gpm) Throughout the step testing, drawdown was measured in nearby wells MW-5B, MW-1, MW-6, and MW-7 <br /> Groundwater extraction data is included in Table 3 Water pumped from the well was stored at the site pending <br />' appropriate disposal upon receipt of characterization sample results <br />' At the end of the test, a water sample was collected from the pump discharge line directly into laboratory supplied <br /> containers The sample was labeled, documented on a chain-of-custody form, and placed on ice in a cooler for <br />' ZB178C Feas Test Report 4 May 9, 2002 <br />