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kF1 K L E I N F E L D E R A-3 2 Monitoring Well Development The wells are developed to reduce the effects of dulling on the formation and to increase the effective hydraulic radius of the wells Monitoring wells are generally developed 24 to 48 hours after installation to allow the grout to set Each well is first sampled with a clear disposable bailer to visually inspect for a hydrocarbon layer or sheen If no product layer or sheen is observed on the water, the well is developed by surging, pumping or bailing Surging along the screened interval of the well is performed to draw the sediment from the formation into the filter pack and the well, and to set the sand pack Development continues until the discharge runs relatively clear of fines Approximately 5 to 10 well volumes are generally removed from each monitoring well Discharge water is stored in 55- gallon drums and left on site for later discharge or disposal by the client, depending on laboratory results The drums are labeled with the date, well number, and a contact person and phone number fA-3 3 Equipment Decontamination To reduce the potential for cross-contamination between wells, developing equipment is washed in a tnsodium phosphate or non-phosphate detergent solution and rinsed in distilled water or steam cleaned prior to use in the next monitoring well A-3 4 Well Survey The locations of soil borings and monitoring wells, and the elevation of the top of the PVC casings are usually surveyed and tied into permanent markers, if readily available Survey accuracy is 0 1 foot for the "x" and "y" coordinates and 01 foot for the "z" coordinate The depth to static groundwater is measured from a set location at the top of the PVC casing (usually the north rim) The depth of water is then subtracted from the elevation of the top of the well casing to provide a groundwater elevation for each monitoring well location 20-4439 01 E03 1 2002R010 Page A-5 Copyright 2002, Kletnfelder, Inc January 23 2002