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March 2003 On-Post Quarterly Groundwater Monitoring Report
Section 3 - Meteorological Station and Transducer Data
Five wells, CS-MW4-LGR, CS-MW9-LGR, CS-MW9-BS, CS-MW9-CC, and CS-MW16-LGR, are equipped with transducers to continuously log groundwater levels. Two meteorological weather stations, one adjacent to well CS-MW16-LGR and one in the southeast corner of CSSA, record well data including precipitation and other weather characteristics. These data are evaluated together to identify trends in groundwater recharge. Precipitation data collected from the meteorological station at well CS-MW16-LGR between October 5, 1998, and March 15, 2003, are shown in Figure 3-1, along with groundwater elevation data from the well�s transducer. Well CS-16 was originally completed as an open borehole through the LGR, BS, and CC Formations. Figure 3-1 illustrates rapid rises in groundwater elevation within well CS-16 immediately following a rain event. Additional discussion of trends in groundwater recharge and comparisons between formations will be included in the Annual Groundwater Monitoring Report. During the September 2001 monitoring event, the water level data from the CS-MW16-LGR transducer was not recorded due to a technical malfunction. Therefore, CS-MW16-LGR groundwater elevation data from the June 2001 event through the September 2001 monitoring event is missing from Figure 3-1. On May 21, 2002 the transducer was removed from CS-MW16-LGR for telemetry testing and the transducer was returned to the well on June 6, 2002. Transducer data is missing from June 20, 2002 through July 10, 2002, due to the well upgrade of CS-16 to CS-MW16-LGR.
Groundwater levels in all types of wells decreased an average of 8.47 feet between December 11, 2002, and April 10, 2003. During this period, there were 32 rainfall events with a total precipitation of 6.22 inches. During the previous quarter when groundwater levels increased 104.75 feet, there were 31 rainfall events with a total precipitation of 12.91 inches. For comparison of all events, Table 3-1 demonstrates the total precipitation received each quarter, average groundwater elevations in each formation, and the average groundwater elevation change, whether increase or decrease.
In Figure 3-2, the groundwater elevation data for the CS-MW9 cluster wells was plotted in comparison to the daily precipitation as measured from the meteorological station at Well CS-MW16-LGR. Well CS-MW9-CC groundwater elevation data from December to March does not appear in Figure 3-2 due to technical malfunction of the transducer. Transducer data collected from wells CS-MW16-LGR and CS-MW4-LGR is shown in Figure 3-3. Results for well CS‑MW4‑LGR are missing from March 23, 2002 to September 3, 2002 due to a technical malfunction.