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Groundwater Sampling and Analysis Plan (SAP) <br />Water levels and well-water samples shall be collected from approved wells and <br />reported semiannually to the RWQCB. Data collection shall utilize the protocols <br />described in this Groundwater Sampling and Analysis Plan (SAP). <br />Groundwater Sampling Plan <br />All groundwater sample collection, handling, and sampling procedures shall utilize the <br />following protocols 1,2 . <br />A "Well Purging and Sample Log" shall be completed for each sampling site. <br />Upon arrival at the site, the water level in the well shall be measured by <br />electronic sounding or steel tape and recorded to the nearest 0.01 feet. The <br />sounder or tape shall be cleaned with peroxide solution prior to each use to <br />minimize coliform contamination. <br />Multi-meter probes shall be calibrated regularly using appropriate standards. <br />Preliminary measurements of specific conductance or previous measurements <br />are used to select the calibration standard closest to the specific conductance of <br />the well water (within 125 to 1,500 µS/cm, depending on the well water <br />conductance). <br />When well yields permit, wells shall be purged and sampled using a submersible <br />pump and dedicated plastic tubing at each well. The submersible pump and <br />tubing shall be cleaned prior to each use. A minimum of three well casing <br />volumes shall be evacuated from each well prior to collecting the sample; the <br />casing volume is calculated from the depth to water and casing geometry. Field <br />parameters (pH, specific conductance, temperature, dissolved oxygen, and <br />oxidation-reduction potential) shall be monitored using a multi-meter and flow cell <br />during purging (i.e., at the beginning and then following each casing volume). <br />Stabilization of these parameters indicates the collected water is representative <br />of groundwater. <br />If well yield is insufficient to produce three-casing volumes in a reasonable time, <br />the well shall be evacuated and then sampled after recovery. <br />When conditions allow, purge water shall be spread on land or the disposal area. <br />Otherwise, purge water shall be collected in a tank or drum and transported for <br />spreading at the nearest disposal field. <br />1 U.S. Geological Survey, 1978, National Handbook of recommended methods for water-data acquisition. <br />2 Wood, W.W., 1981, Guidelines for collection and field analysis of groundwater samples for selected <br />unstable constituents, U.S. Geol. Survey Techniques of Water Resources Investigations, Book 1, Chapter <br />D2. <br />1