H2A recently completed an evaluation of LNAPL transmissivity (Tn) at a major international airport in Texas. The results are being used to further enhance the existing mobile dual-phase extraction (MDPE) remediation strategy for the site by focusing efforts on wells exhibiting the highest LNAPL transmissivity. By doing so, H2A has realized increases in product recovery of up to 20 percent over historic efforts of comparable duration. H2A also plans to utilize LNAPL transmissivity trends over time to gauge remediation efficacy and to establish active remediation endpoints. It should be noted however, that although LNAPL transmissivities of between 0.1 to 0.8 square feet per day typically demonstrate the limit of practical LNAPL recovery, potential Texas Risk Reduction Program (TRRP)-32 (Risk-Based NAPL Management) triggers (as established by the Texas Commission on Environmental Quality) must also be considered.
- H2A’s Mike Hawthorne Coauthors NAPL Article in Ground Water Monitoring & Remediation on Identification of Confined and Perched NAPL
- H2A’s Dr. Ranga Muthu to Conclude Training on API’s LNAPL Transmissivity Spreadsheet
- ASTM Standard References Multiple Methods for Estimating LNAPL Transmissivity