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File No. 20-1147-44 ► r ' ` FEDER <br /> September 28, 1993 <br /> Water level measurement will be made in the wells prior to purging and sampling the wells. <br /> Measurement protocol will be as follows: <br /> 1. The wells will be opened and allowed to equilibrate with the atmosphere. <br /> 2. The water level probe will be decontaminated in a trisodium-phosphate wash, followed <br /> by a distilled water rinse, prior to use in each well. <br /> 3. Water level measurements will be 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 <br /> PVC well casing. The water level measurements are then converted to elevations <br /> using the surveyed casing elevations. <br /> Ground water samples will be collected from the monitoring wells at the site using the <br /> following protocol: <br /> 1. Down-well equipment(pumps, bailers, etc.) will be decontaminated by steam cleaning <br /> or by scrubbing in a trisodium-phosphate wash followed by a distilled water rinse, <br /> prior to use in each well. Bailer cord will be replaced prior to use in each well. <br /> 2. The depth-to-water will be measured using a conductivity-based water-level meter. <br /> 3. The volume of water standing in the well will be calculated by subtracting the depth- <br /> to-water measurement from the depth of the well and multiplying by the appropriate <br /> conversion factor (0.16 for 2-inch wells). <br /> 4. Three to five well volumes of water will be purged from each well using a <br /> submersible pump, bladder pump, or teflon bailer. <br /> 5. Physical parameters (pH, electrical conductivity, and temperature) will be monitored <br /> for stability during purging. The physical parameter measurements are recorded on <br /> purge-and-sample logs, along with the time and volume of water purged at each <br /> measurement. <br /> 6. Samples will be collected with a disposable bailer or bladder pump into appropriately <br /> prepared bottles provided by the analytical laboratory. <br /> 7. Samples will be immediately labelled and placed in an iced sample container. At the <br /> end of the day, the samples are delivered to the analytical laboratory under chain-of- <br /> custody control. <br /> Copyright 1993 Kleinfelder, Inc. Page 3 of 4 <br />