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Red Creek Quarry Baseline Water Investigation Section 5 <br /> <br /> <br />5-9 <br />DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document. <br />elevations rise above the estimated limestone-sandstone contact. Groundwater elevations in Well 2S <br />are approximately four feet below the limestone-sandstone contact the entire monitoring period. <br />Simulated groundwater elevation contours from the steady-state EC model (BC 2023b, Appendix <br />3.7) indicate groundwater flow is generally to the northeast towards the Arkansas River. The <br />groundwater contours are based on an interpolated water table generated from the four on-site <br />monitoring wells in the northwest corner of the site. The interpolated water table introduces a <br />measure of uncertainty due to lack of measured groundwater data in the central, southern, and <br />eastern portions of the Site. <br />5.3 Flow Monitoring Results <br />Data recorded by the transducer installed in the flume plastic standpipe recorded the total of <br />barometric and water pressure at six-hour intervals. The transducer pressure data were <br />compensated for barometric pressure using the K1V6 weather station data. Comparing the pressure <br />readings from the transducer and the K1V6 weather station indicated the data trend well together; <br />however, the pressure range between the two data sets is slightly different as shown by the y-axis <br />scales in Figure 5-1. The transducer records both air and water pressure acting on the equipment <br />sensor; therefore, instances where the transducer pressure is greater than the barometric pressure <br />are the result of water pressure acting on the transducer. <br />Transducer data corrected using barometric data from the K1V6 weather station resulted in higher <br />calculated head values than the head measured by the staff gauge within the flume (Figure 5-2). The <br />difference in the head calculated using the transducer data and the measured staff gauge data is <br />likely the result of the differences in barometric pressure at the Site compared to the Fremont <br />County airport. The elevation of the K1V6 airport weather station is approximately 290 feet higher in <br />elevation than the flume installed in Red Creek. Differences in temperature between the Fremont <br />County airport and Red Creek may also cause the variations in pressure readings. <br />The pressure values from the K1V6 weather station were subtracted from the transducer pressure <br />readings in order to compensate for barometric pressure. Data on the height of water in the flume <br />measured against the staff gauge were reviewed to determine a correction factor to compensate for <br />the differences in elevation and temperature between the Fremont County Airport and the flume <br />location. An additional correction factor of 6.2 cmH2O was subtracted from the compensated <br />transducer data. The head values calculated from the corrected transducer data matched the <br />observed head values measured within the flume (Figure 5-3). <br />The corrected transducer pressure was converted to flow in cubic feet per second (cfs) using the <br />equation supplied by the EZ Flow Flume manufacturer (Equation 1). <br />Equation 1 <br />𝑑𝑙𝑜𝑤=3.978 𝑤 𝐻𝑑𝑎𝑑1.619 <br />where: <br />flow = cubic feet per second (cfs) <br />head = relative water level in flume (ft of H2O) <br />Flow rate data were calculated using both the head measurements from the flume staff gauge and <br />the correct transducer head data (Figure 5-4). The median calculated flow rate within Red Creek is <br />0.15 cfs, the lowest calculated flow rate was 0.04 cfs and the maximum calculated flow rate was <br />3.36 cfs. Visual observations of flow within Red Creek and measured flow with the flume staff gauge <br />indicate the flow in Red Creek is perennial. Flow rates calculated with the transducer data indicate