Laserfiche WebLink
h� KLEINFELDER <br /> B-3.4 Well Survey <br /> The locations of soil borings and monitoring wells, and the elevation of the to of the PVC <br /> g g p <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 rim) 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 /> iB-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 Prior to obtaining water level measurements, the monitoring wells would be opened and <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 /> 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 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 /> 2 The depth to groundwater is measured using a conductivity-based water-level meter <br /> 3 The volume of water in gallons standing in the well is calculated by subtracting the depth <br /> to groundwater measurement from the depth of the well and multiplying by the <br /> appropriate conversion factor(0 16 for 2-inch wells, and 0 65 for 4-inch wells) <br /> ' 20-1311-40 E01/2019RO39 Page B-6 <br /> O 1999,Kleinfelder,Inc January 20, 1999 <br />