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Ryegrass Limited Purpose Landfill and Balefill Closed Landfill <br />Groundwater and Leachate Sampling and Analysis Plan <br />Kittitas County Solid Waste <br />SamplingStandard Operating Procedure Groundwater <br />Objective <br />The objective of this document is to describe methods for the collection of groundwater samples <br />from monitoring wells. Groundwater sample collection procedures include equipment cleaning, water <br />elevation measurements, well purging, and sampling. Collect representative groundwater samples <br />from monitoring wells by minimizing stress on the formation and minimizing disturbance of sediment <br />that has collected in the wells. <br />Materials <br />The following materials will be used for collection of groundwater samples: <br />■ Sample containers <br />■ Field sampling data sheets <br />■ Specific conductivity, pH, and temperature hand-held meter. <br />■ Electronic water -level indicator <br />■ Pump controller <br />■ Compressed nitrogen gas bottle and regulator <br />■ Filters for dissolved metals <br />Prior to the sampling event, all equipment which will be placed in the well or come in contact with the <br />groundwater sample will be disassembled and cleaned using the procedure described in the section <br />titled `Standard Operating Procedure Decontamination". <br />Procedures <br />3. Prior to purging a monitoring well, measure the depth to water using the method described in <br />the "Standard Operating Procedure Static Water Level Measurement". <br />4. Unlock well and remove cover. <br />5. Measure initial water level from reference point to the nearest 0.01 foot. Reconfirm <br />measurement and record on Field sampling data sheet. <br />6. Start pumping well at 200 to 300 milliliters per minute (mVmin) using dedicated pump. <br />Record on Field sampling data sheet. <br />Monitor indicator parameters (pH, specific conductivity, and temperature) every three to five <br />minutes during purging of well and record on Field sampling data sheet. Additional indicator <br />parameters may include oxidation-reduction potential, dissolved oxygen, and turbidity. The <br />well is considered stabilized and ready for sample collection when the indicator parameters <br />have stabilized within 10 percent of the previous reading for three consecutive readings. In <br />general, the order of stabilization is pH, temperature, and specific conductance, followed by <br />oxidation-reduction potential, dissolved oxygen and turbidity. <br />April 2024 1 553-1763-010 B-3 <br />