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Ryegrass LPL and Ryegrass Balefill Landfill Upgradient Groundwater <br />Investigation <br />Kittitas County Solid Waste <br />Contents <br />LIntroduction....................................................................................................................................1 <br />2. Background.........................................................................................................................................1 <br />2.1 Facility Description......................................................................................................................1 <br />2.2 Site History ...................................................................................................................................1 <br />2.2.1 Ryegrass Balefill Landfill..............................................................................................1 <br />2.2.2 Ryegrass Limited Purpose Landfill...............................................................................2 <br />2.2.3 Other Facility Operations..............................................................................................2 <br />3. Hydrogeology .......................................................................................................................................3 <br />3.1 Geologic Setting...........................................................................................................................3 <br />3.2 Groundwater Monitoring History .................................................................................................3 <br />3.2.1 Water Quality Evaluations.............................................................................................4 <br />3.3 Upgradient Source Evaluation....................................................................................................4 <br />3.4 Shallow Aquifer Details...............................................................................................................4 <br />3.5 Groundwater Gradient.................................................................................................................5 <br />3.6 Groundwater Flow Velocity..........................................................................................................5 <br />3.6.1 Evidence of Upgradient Sources..................................................................................5 <br />3.7 Cross Sections.............................................................................................................................5 <br />3.7.1 Top of the Vantage Interbed.........................................................................................6 <br />4. Drilling, Construction, and Testing.....................................................................................................6 <br />4.1 Drilling..........................................................................................................................................6 <br />4.2 Construction.................................................................................................................................6 <br />4.3 Well Development & Testing.......................................................................................................7 <br />4.3.1 Well Development.........................................................................................................7 <br />4.3.2 Pump Placement...........................................................................................................7 <br />4.3.3 Short -Term Pumping Test.............................................................................................7 <br />4.3.4 Well Survey....................................................................................................................7 <br />4.4 Investigative Derived Waste........................................................................................................8 <br />4.5 Hydraulic Testing.........................................................................................................................8 <br />4.5.1 Transducers...................................................................................................................8 <br />4.5.2 Manual Measurements................................................................................................8 <br />4.5.3 Testing procedures.......................................................................................................8 <br />4.5.4 Hydrogeologic Analysis.................................................................................................8 <br />April 2024 1553-1763-010 i <br />Revised May 2024 <br />