One of our top priorities at H2A is implementation and management of strategic, effective, efficient LNAPL remediation efforts on behalf of our clients. One way we do this is through heavy reliance on LNAPL transmissivity as a leading, progress, and shutdown metric for hydraulic recovery of LNAPL. And, we’re not just concerned with IF recovery makes sense at your site, but WHERE… where do we focus our efforts (i.e., your money)?
ASTM’s Standard Guide for Estimation of LNAPL Transmissivity (E2856-13), identifies baildown/slug tests, manual LNAPL skimming tests, recovery data-based methods, and tracer test-based methods as reliable techniques by which to measure LNAPL transmissivity. Last year, H2A developed the H2AWK™ system (patent in progress) to facilitate oil/water ratio testing, a recovery data-based method involving measurement of the steady-state LNAPL/groundwater production ratio during constant groundwater drawdown.
Development of the H2AWK™ instrument allows H2A to quantify volumetric LNAPL and water production from individual wells during oil/water ratio tests. The primary benefit of using the H2AWK™ is the generation of reliable data, the accuracy and precision of which cannot be matched. This is absolutely critical when quantifying and reporting LNAPL transmissivities that will be used to enhance a site’s LNAPL Conceptual Site Model (LCSM), make critical decisions regarding how remediation systems are managed, and determining when it makes sense to cease hydraulic recovery of LNAPL.
Current H2AWK™ (third generation model) design improvements include significant modifications to the unit, most notably a modular-based design for quick assembly/disassembly in the field, and the addition of a dual-diaphragm pump, enabling operation at remote wells not currently equipped with extraction equipment. These improvements will make the unit more operator-friendly, safer, and easier to transport and decontaminate. H2A has also begun design and construction of the fourth generation H2AWK™, a higher volume model with a larger holding tank that will also incorporate a dual-diaphragm pump. The fourth generation model will also be a modular unit like the third generation model.
How can we make our H2AWK™ system and LNAPL transmissivity work for you at your site?