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Louisiana Department of Environmental Quality Risk Evaluation/Corrective Action Program (RECAP)

The Louisiana Department of Environmental Quality's Risk Evaluation/Corrective Action Program (RECAP) involves aquifer tests, well surveys, and measurement of aquifer properties for water resource management. Identify aquifer properties, constraints, and estimate well yields for different aquifer types.

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Louisiana Department of Environmental Quality Risk Evaluation/Corrective Action Program (RECAP)

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  1. Louisiana Department of Environmental QualityRisk Evaluation/Corrective Action Program(RECAP)

  2. Aquifer Tests

  3. Appendix F • Current Use • 1-mile radius water well survey • 500-feet radius walking receptor survey • Potential Use • Maximum sustainable well yield • Direct Measurement • Estimated Measurement • Total Dissolved Solids (TDS) of groundwater • EPA Standard Method 160.1

  4. Figure 3 NOTE: CLASS 1A - Currently supplies a public water supply. CLASS 2A - Currently supplies a domestic, agricultural, or other supply.

  5. Determine Site Constraints • Soil Type • Thickness of Encountered Formations • Identification of Aquifers and Water Levels • Aquitards Encountered • Hydraulic Barriers

  6. Determine Aquifer Properties • Hydraulic Conductivity (K) • Saturated Thickness (b) • Transmissivity (T) • Specific Yield (Sy) • Specific Storage (Ss) • Storativity (S) • Porosity (n)

  7. Unconfined Aquifer UnsaturatedZone Saturated Zone

  8. Confined Aquifer UnsaturatedZone Confining Layer Saturated Zone Confining Layer

  9. Direct Measurement of Aquifer Properties • PUMPING TESTS • Constant Rate • Step-drawdown • SLUG TESTS • Slug In • Slug Out

  10. SLUG TESTS Slug In Unsaturated Zone Saturated Zone Water Flow WaterFlow

  11. SLUG TESTS Slug Out Unsaturated Zone Saturated Zone Water Flow WaterFlow

  12. Conceptual Pumping Test Models

  13. Conceptual Slug Test Models

  14. Estimation of Aquifer Properties • HYDRAULIC CONDUCTIVITY • Published References • Laboratory Procedures • Field Procedures • AQUIFER THICKNESS • USGS, LGS, DNR, DOTD • SPECIFIC YIELD/SPECIFIC STORAGE • Published References

  15. Estimated Well Yield forConfined Aquifer

  16. Estimated Well Yield forUnconfined Aquifer

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