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' k4 KLEINFELDER <br /> B-3.3 Equipment Decontamination <br />' To reduce the potential for cross-contamination between wells, developing equipment is washed <br /> in a tnsodium phosphate or non-phosphate detergent solution and rinsed in distilled water or <br /> steam cleaned pnor to use in the next monitoring well <br />' B-3.4 Well Surve <br />' The locations of soil bonngs and monitoring wells, and the elevation of the top of the PVC <br /> casings are usually surveyed and tied into permanent markers, if readily available Survey <br /> accuracy is 0 1 foot for the "x" and "y" coordinates and 01 foot for the "z" coordinate The depth <br /> to static groundwater is measured from a set location at the top of the PVC casing (usually the <br /> north rim) The depth of water is then subtracted from the elevation of the top of the well casing <br /> to provide a groundwater elevation for each momtonng well location <br />' B-4 GROUNDWATER MONITORING <br /> B4.1 Water Level Measurements <br /> Water level measurements are made in the wells prior to purging and sampling the wells <br /> Measurement protocol is as follows <br /> monitoring wells would be opened and <br /> 1 Prior to obtaining water level measurements, theg p <br /> allowed to equilibrate for a period of approximately %2 hour <br />' -2 The water level probe is decontaminated in a trisodium phosphate or non-phosphate <br /> detergent wash, followed by a distilled water rinse, prior to use in each well <br /> 3 Water level measurements are made using a conductivity-based water-level meter <br /> Depth-to-water is generally measured from a surveyed mark on the north rim of the PVC <br />' well casing <br />' The water level measurements are converted to elevations using the surveyed casing elevations <br /> B4.2 Groundwater Sampling <br />' Groundwater samples are collected from the monitoring wells at the site The sampling protocol <br /> for each well is as follows <br /> 1 Down-well equipment (pumps, bailers, etc) is decontaminated by steam cleaning, or by <br /> scrubbing in a trisodium-phosphate or non-phosphate detergent wash followed by a <br /> distilled water rinse, prior to use in each well Bailer cord is replaced prior to use in each <br /> well <br /> 20-1417-16 E04/ST02RO38 Page B-5 <br /> 02002 Klemfelder,Inc June 7,2002 <br />