NassCass provides its clients with state-of-the art capabilities including implementation of 8hr and 24 hr, or longer, remediation events using our mobile dual-phase extraction (MDPE) technology. With this capacity NassCass can address sites that have limited amounts of free product or need spot treatments in recalcitrant areas of a remediation target without the expense of permanent remediation system installation, which could involve permanent power installation, system compound and manifolds, and trenching. Existing monitoring or recovery wells can be used on a short term basis for total fluids extraction using submersible pumps with the assistance of vacuum. Application of vacuum while performing total fluids extraction results in a wider zone of influence and an enhanced migration rate of free product, contaminated groundwater and vapor to the extraction location.
In contrast to the approach used by other vendors of similar technology, NassCass does not use “drop tubes” or “stingers” to effect removal activities. Rather, NassCass uses submersible pumps, which are capable of being used in two-inch diameter or larger recovery/monitoring wells. As such, the remediation system is more energy efficient and can be tuned to optimize extraction based on each recovery well’s groundwater yield and air flow. The use of pumps also eliminates the difficulties associated with using “drop tubes” at sites where groundwater is relatively deep.
For sites where sustained high-dissolved BTEX or residual free product (i.e., absorbed free product) is present, NassCass has the ability to supplement the MDPE process with the addition of in-situ chemical oxidants (ISCO) and/or biodegradable surfactants.