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Groundwater Investigation and Associated Source Characterization
Table 9.2-1 - Summary of Remedial Alternatives* for Groundwater Contamination
| Remedial Alternative | Data Objectives | Recommended Actions |
| Source Removal | 1. Determine effects of source removal actions at B-3 and O-1 2. Determine downgradient extent of plume(s). | 1a. Quarterly groundwater monitoring (water levels, sampling and analysis, volume of rainfall, barometric pressures). 1b. Install shallow wells in B-3 and O-1 area to monitor perched zone contaminant levels. 2a. Use monitoring data from old and new wells during dry and rainy seasons to determine well location(s). 2b. Install wells in middle Trinity aquifer. |
| Should no effects from B-3 and O-1 source removal be detected, see following alternatives | ||
| Natural Attenuation | 1. Determine if attenuation of contaminants is taking place in middle Trinity aquifer. | 1a. Install sufficient number of wells to establish plume extent, collect natural attenuation data and monitor the plume. 1b. Evaluate data over time to determine status of attenuation mechanisms. |
| Unsaturated zone SVE system | 1. Install pilot test system to attempt remediation of VOCs in fractured zones above water table. | 1a. Use existing data (soil gas and fault locations) to locate and install VEW. 1b. Test system over periods of weeks. 1c. Determine feasibility of long-term effects from SVE option. |
| Pump and treat | 1. Attempt containment of plume. 2. Attempt remediation. 3. Provide additional water for irrigation or other similar use. | 1a. Install wells to define plume, and perform aquifer test to assess aquifer characterization under pumping conditions. 1b. Perform tracer dye study of flow pathways. 1c. Install observation wells and optimize pump wells. 1d. Air strip at surface to treat VOCs. Dispose of treated water in outfall 002 under NPDES permit. |