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! • 26 October 2000 0 AGE-NC Project No 95-0128 Page 5 of 10 35 GROUND WATER SAMPLING AND ANALYSIS Following the installation of the new monitoring wells, ground water monitoring and sampling activities will be conducted for all the monitoring wells on a quarterly basis for a minimum of one year (four sampling events) Additionally, monitoring activities will include recording depth to ground water measurements and collection of ground water samples Ground water sample collection protocols are described in Section 4 3 Ground water samples will be analyzed by a DHS-certified laboratory for the analytes noted in Section 3 4 Laboratory reports for ground water analyses, testing methods, laboratory quality assurance/quality control (QA/QC) reports and sample chain of custody documentation will be presented in quarterly reports with findings and recommendations 36 WELL PUMPS, INSTALLATION AND PROCESS PIPING It is anticipated that a Grundfos Rediflow down-well pump, type 5E5, equipped with Franklin 1/3 • hp, 230V, 3-wire motor will be installed in the newly installed ground water extraction well One- inch diameter Schedule 40 PVC pipe will be installed from the pump discharge to the surface with a safety chain to prevent dropping the pump to the well bottom This well system is rated to removed five-gallons of water per minute (gpm) To minimize sediment intake through the pump, the bottom of the pump/motor assembly will be suspended approximately 2 feet from the extraction well bottom Electrical wiring will be connected from the top of the pump through Class I electrical connectors/function boxes and electrical conduit to the pump controller 3 7 WELL AND PROCESS PUMP CONTROLLERS Both the extraction well pump and the water treatment process pump will be controlled by PumpTec controller, the ground water extraction pump will operate on and independent controller The pump control will be supplied by an amperage sensing/time control switch This switch will detect a decrease of amperage when water level drops below the impeller intake from the Grundfos pump The process pump, located after the holding tank, will be controlled by electrode switches placed at various levels in the holding tank An emergency shut-off switch will be located immediately below the top of the holding tank An intermediate pump-on switch will be placed approximately 8-inch below the emergency shut-off switch and activate the process pump Intermediate pump-off switches will be utilized near the bottom of the holding tank to turn the process pump off Advanced GeoEnwonmental,Inc