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•12/05/2005 17:12 FAX 209 948Q021 • 12014 <br /> (� KLEINFELDER <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 /> B-4 GROUNDWATER MONITORING <br /> B4,I 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%,hour_ <br /> 2. The water level probe is decontaminated in a trisodium phosphate or non-phospbate <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 convemd to elevations using the surveyed casing elevations. <br /> 134.2 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-l:vel 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-inen wells). <br /> 02001 PROP.ENV/ST03P4A3 December 5,2003 <br /> z 2003 Rdeinfetder. (ne. Page vi of ix <br /> ' ,� ° h} 4! v '�` '� _ d'�SE3'�.•^^e.�"'z��'"�g'P Nti aL`v'"y�-� rih.�' �_ AsJa- "�4�wr� <br />