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March 2005 On-Post Quarterly Groundwater Monitoring Report
Section 3 - Weather Station and Transducer Data
Eighteen wells, CS‑1, CS‑10, CS‑11, CS‑MW1‑CC, CS‑MW2‑CC, CS‑MW4‑LGR, CS‑MW8‑LGR, CS‑MW8‑CC, CS‑MW9‑LGR, CS‑MW9‑BS, CS‑MW9‑CC, CS‑MW11A‑LGR, CS‑MW11B‑LGR, CS‑MW12‑LGR, CS‑MW12‑CC, CS‑MW16‑LGR, CS‑MW16‑CC, and CS‑MW18‑LGR are equipped with transducers to continuously log groundwater levels. Two weather stations are in place at CSSA, WS-N, adjacent to well CS‑MW16‑LGR in the north-central region of CSSA and the southern weather station (WS‑S), in the southeast corner of CSSA adjacent to Area of Concern (AOC)‑65. Both record meteorological data including precipitation, wind speed, wind direction, and temperature. The data are evaluated to identify trends in groundwater recharge. All transducer data collected from March 2004 through March 7, 2005, are presented in Figure 2-6. Interpolated data points are used for some wells where data gaps occurred due to well re-construction and/or transducer battery failure. Well CS‑MW16-CC data shown in Figure 2-6 does not indicate groundwater recharge conditions due to pumping which has occurred since February 23, 2004. Precipitation recorded at WS-N is also shown.
Overall, groundwater levels in all three formations throughout CSSA decreased an average of 6.47 feet between December 3, 2004 and March 11, 2005. During this period WS‑N reported 33 rainfall events with a total precipitation of 7.38 inches, while WS-S reported 31 rainfall events with a total of 6.48 inches of rainfall. Rainfall events during this quarter occurred sporadically, with 1.5 inches of rain recorded at WS-N and 1.55 inches of rain recorded at WS-S on January 27, 2005, and 1.03 and 0.57 inches of rain, respectively, on March 4, 2005. During the previous quarter when groundwater levels increased 63.07 feet, there were 33 rainfall events with a total precipitation of 20.68 inches at the WS-N and 27 rainfall events with a total precipitation of 22.95 inches at WS-S. For comparison of all events, Table 3-1 shows the total precipitation received each quarter, average groundwater elevations in each formation, the average groundwater elevation change in each formation, the approximate gradient, and approximate gradient flow direction.