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' �v 23 April 2002 �. AGE-NC Project No 95-0142 ' Page 13 of 16 ' 4 5 1 Ground Water Extraction Piping System A network of one-Inch, schedule 40 PVC piping and schedule 80 PVC electrical conduits will be Installed In a trench approximately Moot wide by 1 foot deep, the PVC Schedule 80 conduits will be Installed for the ground water extraction system and for pump power control within the trenches for the extraction wells ' The one-Inch PVC piping will be routed from each ground water extraction well head to a water holding tank, the holding tank will be connected with two-Inch PVC piping to the GAC ground ' water treatment system consisting of three,in-line vessels A plan of the proposed piping system and enclosed unit location are depicted in Figure 4a ' At the direction of the property owner and due to property use constraints,the location of the ground water pump and treat system is proposed to be at the southeast corner of the site (Figure 3) This proposed location of the pump and treat system will allow the site to conduct normal day-to-day business without interference from the operation of the remediation system The pump and treat system will be secured by a chain-linked, gated enclosure approximately 15 feet wide, 20 feet long and six feet high Electricity is readilyavailable to the site A dedicated electrical meter has been installed that will connect directly to the pump and treat system ' 4 5 2 Discharge Piping System AGE plans to install a two-Inch diameter, schedule 40 PVC pipe underground along the south side ' of the site to the City of Stockton discharge line located at Scotts Avenue (see Figure 4a) AGE anticipates a continuous discharge of treated ground water from the site to the City of Stockton sanitary sewer at a flow rate of approximately 20 gallons per minute 4 5 3 Ground Water Extraction Monitoring Activities The pump and treat system will be monitored weekly to ensure optimal removal of dissolved petroleum hydrocarbons and to comply with the required City of Stockton discharge permit The ' ground water effluent flow readings will be recorded downstream of the GAC absorption vessels Grab treatment water samples will be collected'on a monthly basis from the Influent and effluent sample points of the pump and treat system The water samples will be collected Into 40-m1 ' EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative, • Advanced GcoEnvironmental,Inc