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KLEINFELDER <br /> drums and left on site for later discharge or disposal by the client, depending on <br /> laboratory results The drums are labeled with the date, well number, and a contact <br /> Person and phone number <br /> A-3.3 Equipment Decontamination <br /> To reduce the potential for cross-contamination between wells, developing equipment Is <br /> washed In a trisodium phosphate or non-phosphate detergent solution and rinsed In <br /> distilled water or steam cleaned prior to use in the next monitoring well <br /> A-3.4 Well Survey <br /> The locations of soil borings and monitoring wells, and the elevation of the top of the <br /> PVC casings are usually surveyed and tied Into permanent markers, If readily available <br /> Survey accuracy Is 0 1 foot for the "x" and "y" coordinates and 01 foot for the "z" <br /> coordinate The depth to static groundwater Is measured from a set location at the top <br /> of the PVC casing (usually the north rim) The depth of water Is then subtracted from <br /> the elevation of the top of the well casing to provide a groundwater elevation for each <br /> monitoring well location <br /> A-4 GROUNDWATER MONITORING <br /> A-4.1 Water Level Measurements <br /> Water level measurements are made In the wells prior to purging and sampling the <br /> wells Measurement protocol is as follows <br /> 1 Prior to obtaining water level measurements, the monitoring wells would be <br /> opened and allowed to equilibrate for a period of approximately '/2 hour <br /> 2 The water level probe Is decontaminated in a trisodium phosphate or non- <br /> phosphate detergent wash, followed by a distilled water rinse, prior to use in <br /> each well <br /> 3 Water level measurements are made using a conductivity-based water-level <br /> meter Depth-to-water is generally measured from a surveyed mark on the north <br /> rim of the PVC well casing <br /> The water level measurements are converted to elevations using the surveyed casing <br /> elevations <br /> A-4.2 Groundwater Sampling <br /> Groundwater samples are collected from the monitoring wells at the site The sampling <br /> protocol for each well is as follows <br /> 28209 T09/ST05R1454/DN Iv Page A-5 <br /> 0 2005, Kleinfelder, Inc November 30, 2005 <br />