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Ryegrass Limited Purpose Landfill and Balefill Closed Landfill <br />Groundwater and heachate Sampling and Analysis Plan <br />Kittilas County Solid waste <br />Sampling and Analysis <br />2A Sample Collection and Handling <br />Monitoring wells will be purged and sampled using dedicated sampling pumps and low -flow purging <br />methods (Barcelona et al. 1994; EPA 1996). Sampling staff will measure groundwater levels to the <br />nearest 0.01 foot using a decontaminated electronic well probe prior to purging and at each <br />stabilization measurement. Specific details are provided in the sections below. Standard operating <br />procedures are provided in Appendix B. <br />2.1.1 Purging and Stabilization Criteria <br />Wells will be purged using dedicated Grundfos Redi-Flo 2 electric submersible pumps. The pump intake is <br />placed in the approximately center of the saturated screened interval as measured under static <br />conditions. Samples from springs are collected directly from the spring discharge point. Appendix A <br />includes photographs of the spring sampling points. <br />Prior to collection of groundwater samples, the wells will be purged by pumping a small volume of <br />water to ensure sampled water represents aquifer conditions. The volume pumped will be <br />determined in the field based on stabilization of field parameters: specific conductance, <br />temperature, dissolved oxygen, pH, oxygen -reduction potential (ORP), and turbidity (see Table 3). <br />Stabilization intervals will be evaluated based on the time to displace the entire volume of water <br />within the flow through celi, generally 200 to 400 milliliters (ml-) occurring over approximately 2.5 to <br />5 minutes. Turbidity samples are collected using a separate field meter not connected within the <br />flow through cell. Samples will be collected once the parameter values have stabilized over the <br />course of three sets of measurements as shown in Table 3. <br />If a well can be pumped dry prior to reaching the desired purge volume, it will be allowed to recover <br />prior to sampling, using the minimum time between purging and sampling that would allow collection <br />of sufficient sample volume. Samples will be pumped directly into the appropriate containers, as <br />provided by the laboratory. A field sampling data sheet (provided in Appendix C) will be filled out for <br />each well. <br />When filling the sample bottles, the following procedures and precautions will bead hered to: <br />I. Sample bottles will be filled directly from the tubing, or filter apparatus, with minimal air <br />contact. <br />2. Bottle caps will be removed carefully so that the inside of the cap is not touched. Caps must <br />never be put on the ground. <br />3. The sampling team will wear appropriate nonpowdered latex or nitrile gloves (polyvinyl chloride <br />or vinyl gloves can leave trace levels of phthalate or vinyl chloride). Gloves will be changed <br />between wells or more often. <br />4. Tubing or hoses from the sampling systems must not touch or be placed in the sample bottles. <br />5. Sample bottles, caps, or septums that fall on the ground before filling will be discarded. <br />6. VQC containers will be filled to make sure no headspace or bubbles are present in the sample. <br />Vials will be flipped upside down and tapped to confirm no bubbles are present in the sample. If <br />bubbles are present, the via shall be topped off and cap placed again for additional testing for <br />April 2024 1 553-1753-014 2-1 <br />Revised May 2024 <br />