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k" KLEINFELDER 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 ' A-3 3 Equipment Decontamination To reduce the potential for cross-contamination between wells, developing equipment is washed ' in a trisodium 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 I ' A-4 GROUNDWATER MONITORING A-4 1 Water Level Measurements Water level measurements are made in the wells prior to purging and sampling the wells ' Measurement protocol is as follows ' 1 Prior to obtaining water level measurements, the monitoring wells would be opened and allowed to equilibrate for a period of approximately 1/2 hour ' 2 The water level probe is decontaminated in a tnsodium phosphate or non-phosphate detergent wash, followed by a distilled water rinse, prior to use in each well li 28699 FO /ST03R627 Page A-6 Copyright 2003,Klemfelder, Inc April 22,2003 1