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Ryegrass LPL and Ryegrass Balefill Landrill Upgradient Groundwater <br />Investigation <br />KiWiss County Solid Waste <br />4.4 Investigative Derived Waste <br />Investigative derived waste will include drill cuttings and development/purge water. Unused cuttings <br />from the drilling will be dispensed at the land surface nearby. The development and purge water <br />from the well will be pumped to the nearby leachate evaporation pond. Development water will likely <br />be placed into a tote to allow settling of solids prior to pumping to the evaporation pond, <br />4.5 Hydraulic Testing <br />As noted above, a short-term pumping test will be performed to evaluate aquifer characteristics. The <br />following section describes methods that will be utilized to evaluate aquifer parameters. <br />4.5.1 Transducers <br />Pressure transducers will be used to continuously monitor water levels in selected wells duringthe <br />hydraulic testing. Serial numbers for the pressure transducer, type of transducer, and well <br />identification will be recorded on field forms. Following deployment of the transducer, the depth of <br />deployment will be recorded on the field form. The water level should be allowed to equilibrate for 5 <br />minutes and then a manual measurement of the water level will be completed and documented on <br />the field form. <br />4.5.2 Manual Measurements <br />Depth to water will be manually measured in wells to confirm transducer data (for those wells <br />instrumented with pressure transducers). Depths to water will be measured using a water level <br />probe to the nearest one hundredths of a foot (i.e. 0.01 ft). <br />4.5.3 Tesftg procedures <br />A pumping test will be conducted to assess aquifer properties. Plow rates will be determined based <br />upon well performance during development. A gas generator or electrical cords will be used to power <br />the pump. Water -level measurements will be taken at various time intervals during the pumping test <br />and during water level recovery. Typically, this is completed every minute for the first 10 minutes, <br />every 5-minutes up to 30 minutes, and every 10 minutes up to 1 hour then the pump will be shut off <br />to allow recovery. Similarly, measurements will be recorded for recovery following shutting the pump <br />off. The total volume of water removed from the pumping well will also be regularly recorded along <br />with depth to water. <br />4.5.4 Hydrogeologxc Analysis <br />Hydraulic testing data will be analyzed to determine aquifer parameters such as hydraulic <br />conductivity, transmissivity, confinement, and storativlty by a Washington State licensed <br />hydrogeoiogist. Travel times will be re-evaluated with the new hydraulic testing data from well B8 and <br />compared to the 87 hydraulic testing results, <br />April 2024 1 5 63-17 63.01.0 <br />Revised May 2024 <br />