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8 0 AQUIFER PUMP TEST In order to assess the feasibility of implementing groundwater extraction technology as a remedial measure for the site, field feasibility testing was necessary to evaluate the sustainable groundwater pumping flow rate, draw down radius of influence, aquifer hydraulic parameters such as hydraulic conductivity (K), transmissivity (T), and coefficient of storage (S), and mass loading to a possible treatment unit ATC prepared the Workplan for Additional Assessment, Remediation Well Installation and Feasibility Studies, dated December 21, 2001 to address the need for field feasibility testing 8.1 Aquifer Pump Test System and Procedure An aquifer pump test was performed at the site on December 19, 2002 The aquifer pump test consisted of a step rate pump test, and recovery test Well EX -1 was utilized as the pumping well for the test Wells MW - 12, SVE-2, and SVE-3 were utilized as observation wells These wells were chosen because of their geometric locations Data collected during the aquifer test was used to evaluate aquifer hydraulic parameters The aquifer hydraulic parameter data will be used to evaluate groundwater remediation technologies The Aquifer Pump Test was conducted in accordance with ATC's Standard Operating P1oce°rlarc" In-'Nmy adi - 13 - - - - - y The aquifer test was conducted using a submersible Grundfos environmental pump with a check valve A discharge hose was connected to the pump and extended to the holding tank A flow meter/totalizer was installed to measure the flow rate and total gallons extracted during the test A globe valve and pump controller was utilized to control the extraction flow rate The pump was set approximately one foot from the bottom of the well to alleviate silting of the submersible pump A portable generator was used as the electrical power source to operate and power the pump and associated measuring devices Pressure transducers were installed m the pumping well (EX -1), in three groundwater observation wells (MW -12, SVE-2, and SVE-3), and in an ambient pressure location (EX -1) to observe and regulate the pump test The transducers were connected to a data logger to record and help interpret the collected data Traffic cones and caution tape were used to surround the pumping well and associated test equipment and the discharge hose and all power cords will be secured to the ground using duct tape for health and safety reasons Prior to the start of work, a decontamination area was established This area was secured and consisted of an Alconox solution wash, a first rinse utilizing tap water, and a final rinse utilizing distilled water Down hole equipment was decontaminated prior to, and after each use Prior to equipment set-up, all wells were opened and allowed to stabilize before being monitored The step test was conducted in EX -1, the pumping well used for the aquifer test Each step was intended to consist of pumping groundwater from the well EX -1 at a constant rate in an attempt to create a stabilized groundwater level The flow rate was then increased in each subsequent step until the maximum sustainable flow rate was determined EZ 100966 CAP s FEZ Serve1EZ 1009661Reports1100966CAP 14 ATC Associates Inc ATC Project No 43 25827 0026