New Product for Repair and Sealing of Penetrations to a Certified Landfill Cap
AquaBlok, Ltd manufacturers of innovative composite particle materials, announce the approval of a product formulation that has been used successfully for the repair and sealing of certified landfill caps in various applications. AquaBlok bentonite coated aggregate material maintains low permeability while providing ease of installation for vertical well casings and structural support as a pipe bedding for gas piping.
AquaBlok material can simply be poured into the trench or annular opening in a manner similar to gravel or other bulk backfill material.
AquaBlok Sealant Material Self Compact for Flow Permeability and Conform to Complex Shapes such as Pipe Bedding, Methane Gas Wells and Sheet Pile Walls-without the Use of Geotextiles or Liner Materials.
Current construction practices to re-establish low-permeability conditions, which are dictated by existing and relevant regulations, commonly involve the following general procedure: digging trenches of various depths or drilling a boring (up to three feet in diameter) through each of the surficial protective layer, the low-permeability cap (includin gthe FML component, if present) and finally down into the landfill material. In the case of a vertical pipe section with a 6-12 inch diameter perforated well casing in the boring, screened at the appropriate interval, the annular space would be backfilled above the screened interval with low permeability soils in a "step-cut" fashion to provide good bonding which results in a much larger repair area than the actual peforation.
AquaBlok landfill Applications:
-General Replacement for Bentonite Sealants
-Vertical Risers/Gas Vents and Well Heads
-Sheet Pile Wall/ Sealant Transition to Geomembrane Liner
The use of an AquaBlok sealant material for landfill trenching, gas-well construction or other general purposes eliminates the need to use compacted clay material or step cut a trench or borehole to accommodate appropriate compaction. A similar approach is used where AquaBlok is applied as a pipe bedding and sealant for installation of horizontal pipe, where the landfill soil cap component has been breached.
Use of AquaBlok for cap penetrations and as a pipe sealant has a number of technical, economic, and regulatory based advantages over current construction methods, including:
-Formulations of the product are comprised of sodium bentonite clay, and the low-permeability and resilency, or re-sealing ability, of such material is well known to the environmental and regulatory community.
-The product self-compacts when wetted and hydrated. Consequently, the material can be placed as a single dry lift, with water added afterwards. The material's self-compacting ability precludes the need for additional excavation and therefore use of clay and protective material, as well as compaction-driven backfilling. In the case of a gas well, it can be constructed exclusively within the confines of existing boreholes.
-In its dry form, the product handles easily, like aggregate. Thus, it can be delivered to a site in packages varying from 50-lb sacks to two-ton super sacks and either poured or shoveled by hand.
-The amount of water needed to initially hydrate the product, once place into the annular space, is not critical, thus precluding the need for neutron probe testing during well construction.
The product's demonstrated abilities to act as a low-permeability, air-tight seal greatly increases the potential for successfull re-certification of the landfill cap upon re-inspection.
About AquaBlok, Ltd.
AquaBlok, Ltd is a manufacturer of composite materials utilizing its patented coating and amendment approach. The company has a long history in the environmental industry and a range of products utilized in sediment remediation technologies. Aquablok utilizes its delivery system in a range of products including, pond and industrial impoundment sealing, as seep collars on piping, to construct cut-off walls in porous soil conditions, flood control applications (i.e. levee and dam protection), and to deliver organoclay-based materials. In addition, AquaBlok is a licensee of Halliburton's Baroid Division for the BARACLEAR algae treatment product.
Please contact AquaBlok for pricing and/or distributor inquires.