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Three groundwater monitoring wells were installed between January 20, 2001 and February 16, 2001 at CSSA. These wells, CS-MW3-LGR, CS-MW4-LGR and CS-MW5-LGR, along with other wells in the vicinity, will be used to monitor and evaluate the Lower Glen Rose Formation groundwater near Well CS-16.
Laboratory analyses of soil and rock samples during installation of the three boreholes did not contain VOCs above the reporting limits. Geophysical data from the well bores were utilized for placement of packers to seal off zones and test for water flow. Results demonstrated that the zone selected for injection testing was not highly permeable and gave low hydraulic conductivity values.
The geologic logs, packer test results, and wellbore geophysical data of this summary report will be further evaluated and incorporated into the hydrogeologic data evaluation to be conducted under RL-83. This information will be used to interpret the effects of subsurface fault zones on groundwater gradients and contaminant flow paths and rates at CSSA. In addition, data from this report and other CSSA well information will further the development of a groundwater model for the site.
We recommend continued groundwater monitoring of wells CS-MW3-LGR, CS-MW4-LGR, and CS-MW5-LGR to further assess groundwater conditions at CSSA. In particular, monitoring of these wells and others in the vicinity of Well CS-16 will aid in determining the horizontal and vertical extent of contaminant concentrations in groundwater. The hydrogeologic conceptual site model that is planned to encompass and evaluate in detail the groundwater and geologic data collected to date will greatly support the groundwater investigation efforts. Data from installation of Wells CS-MW3-LGR, CS-MW4-LGR, and CS-MW5-LGR will be included in this conceptual site model. Also, installation of Cow Creek monitoring wells adjacent to CS-MW3-LGR, CS-MW4-LGR, and CS-MW5-LGR is recommended.