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Final September 2002 On-Post Quarterly Groundwater Monitoring Report
Section 3 - Well CS-MW16-LGR Water Level and Transducer Data
Precipitation data collected from the meteorological station at well CS-MW16-LGR between October 5, 1998, and September 16, 2002, are shown in Figure 3-1. Figure 3-1 demonstrates a change in the recharge rate for Well CS-16, re-installed as well CS-MW16-LGR on July 10, 2002. Well CS-16 was originally an open borehole construction well, influenced by groundwater recharge from the Lower Glen Rose, Bexar Shale and Cow Creek formations. The groundwater elevation measured shows different recharge effects after installation of an interval screened within the Lower Glen Rose formation only. Figure 3-1 demonstrates past rapid rises in groundwater elevation within the former well CS-16 immediately following a rain event. After the July 1-4, 2002, rain event the groundwater elevations in well CS-MW16-LGR, did not demonstrate the rapid increase in elevation. Additional discussion of these trends of 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, the transducer was returned to the well on June 6, 2002. Well CS-MW16-LGR is also missing data from June 20, 2002 through July 10, 2002, the transducer was removed during the well upgrade.
As noted earlier, groundwater levels increased 104.50 feet, as averaged from each formation. Between June 17, 2002, and September 16, 2002, there were 30 rainfall events with a total precipitation of 30.98 inches. During the previous quarter when groundwater levels decreased 50.08 feet, there were 17 rainfall events with a total precipitation of 4.46 inches. For comparison from all events, Table 3-1 demonstrates the total precipitation received each quarter and the average groundwater level increase or decrease.
Transducer data was collected from wells CS-MW4-LGR, CS-MW9-LGR, CS-MW9-BS, CS-MW9-CC, and CS-MW16-LGR during this monitoring event. Results for well CS-MW4-LGR are missing from March 23, 2002 to September 3, 2002 due to technical malfunction. Transducer data collected from wells CS-MW16-LGR and CS-MW4-LGR from January 11, 2002, through September 17, 2002 is shown 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 in Figure 3-3.