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1 <br /> I. Groundwater Sampling and Analysis Plan (SAP) <br /> Water levels and well-water samples shall be collected from approved wells and <br /> reported quarterly to the RWQCB. Data collection shall utilize the protocols <br /> described in this Groundwater Sampling and Analysis Plan (SAP). <br /> ' Groundwater Sampling Plan <br /> Quarterly groundwater sample collection, handling, and sampling procedures <br /> ' shall utilize the following protocols?8. <br /> 1. A "Well Purging and Sample Log" shall be completed for each sampling <br /> ' site. An example log is included in Appendix A. <br /> 2. 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. <br /> The sounder or tape shall be cleaned with dilute bleach solution prior to <br /> each use to minimize coliform contamination. <br /> ' 3. Multi-meter probes shall be calibrated at each site using appropriate <br /> standards. Preliminary measurements of specific conductance are made <br /> to select the calibration standard closest to the specific conductance of the <br /> well water (within 125 to 1,500 µS/cm, depending on the well water <br /> conductance). <br /> ' 4. When well yields permit, wells shall be purged and sampled using a <br /> submersible pump and dedicated plastic tubing at each well. The <br /> submersible pump shall be triple-rinsed with de-ionized water between <br /> ' wells. A minimum of three well casing volumes shall be evacuated from <br /> each well prior to collecting the sample; the casing volume is calculated <br /> from the depth to water and casing geometry. Field parameters (pH, <br /> ' specific conductance, temperature, dissolved oxygen, and oxidation- <br /> 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 <br /> ' volume). Stabilization of these parameters indicates the collected water is <br /> representative of groundwater. <br /> 5. If well yield is insufficient to produce three-casing volumes in a reasonable <br /> time, the well shall be evacuated and then sampled after recovery. <br /> 1 <br /> U.S. Geological Survey, 1978, National Handbook of recommended methods for water-data <br /> acquisition. <br /> 8 Wood, W.W., 1981, Guidelines for collection and field analysis of groundwater samples for <br /> selected unstable constituents, U.S. Geol. Survey Techniques of Water Resources Investigations, <br /> Book 1, Chapter D2. <br /> - 10 - <br />