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B-3.3 E ui ment 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 prior to use in the next monitoring well <br /> B-3.4 Well Survey <br /> LThe 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 <br /> depth to static groundwater is measured from a set location at the top of the PVC casing (usually <br /> the north nm) The depth of water is then subtracted from the elevation of the top of the well <br /> casing to provide a groundwater elevation for each monitoring well location <br /> B-4 GROUNDWATER MONITORING <br /> B-4 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 /> 1 Pnor to obtaining water level measurements, the monitoring wells would be opened and <br /> allowed to equilibrate for a period of approximately '/Z hour <br />' 2 The water level probe is decontaminated in a trisodium phosphate or non-phosphate <br /> detergent wash, followed by a distilled water nnse, 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 nm of the PVC <br /> well casing <br /> The water level measurements are converted to elevations using the surveyed casing elevations <br />' B-4.2 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 tnsodxum-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 E02/2000R578 Page B-5 <br /> ®2000 Kleinfelder,Inc July 28,2000 <br /> KI LIN[ I LOFR !tS?i L1st NAA ilk 51u(I Ym I ton ( A ')-)20i-47114 f?U`ll 1148 1 ,}i _'[1')} )atS Of>?1 t 1v <br />