USE OF SOLI-SOIL AS LANDFILL COVER MATERIAL
Soli-Bond, Inc. is a nationally recognized leader in treatment and reuse of non-hazardous drilling muds, cuttings and production wastes derived from oil and gas exploration activities. Soli-Bond, Inc. has developed a patented process for the treatment of these waste types, in a manner allowing the product to be utilized as daily and intermediate landfill cover. The product, trademarked as Soli-Soil, meets the functional and procedural conditions of daily/ intermediate cover as defined by the Integrated Waste Management Board Regulations (Title 14, California Code of Regulations) and guidelines (IWMB Procedural Guidance for the use of Alternative Daily Cover 4/16/90). The Soli-Soil materials provide exceptionally good product performance while conserving on-site soil supplies and reducing operating costs.
SOLI-SOIL PRODUCT DESCRIPTION
Soli-Soil is a manufactured soil-like material with physical properties similar to a fine-grained clay. Hauling, stockpiling, and compaction are identical to any fine-grained soil. The product is alkaline in nature due to required treatment additives. Consequently, Soli-Soil has excellent buffering capacities for acid condition found associated with some landfill sites. Optimum moisture content for product handling and compaction is 30% by weight. All materials delivered to the operational area would have a maximum moisture content below 50% by weight.
FUNCTIONAL CRITERIA OF A SOLI-SOIL COVER SYSTEM
The Integrated Waste Management Board has identified the functional criteria for daily and intermediate landfill cover, requiring site operations to meet these minimum performance standards. All alternative cover products are required to be evaluated to assure minimum performance standards are met. Soli-Soil meets and exceeds all standards.
- Barrier to the Emergence or Attraction of Vectors
Soli-Soil is Soil-like in quality and compacts well with wheel/track compaction of landfill equipment. The fine-grained nature of the product does not allow for burrow construction (rodents) or insect emergence. The alkaline nature inhibits insect metamorphosis.
- Progress of Fires within the Landfill
Soli-Soil is a mineralized product incapable of supporting combustion. The fine-grained clay-like nature and exceptionally good compaction capability inhibits oxygen and air movement between landfill cells. The product provides an excellent fire barrier when used as other daily cover at the working face or intermediate cover.
- Escape of Odors
The movement of odors as with air-oxygen is controlled extremely well with Soli-Soil cover material. Soli-Soil has no significant odors.
- Excess Infiltration
The inherent permeability of Soli-Soil precludes excess infiltration even with periodic ponding caused by differential settlement. Permeabilities of 1.0 x 10- – 1.0 x 10- cm/sec. are typical of product performance.
Procedural criteria for cover materials include control of erosion, protection of unsightliness, and ability to be compacted to a minimum thickness of six inches.
- Erosion Control
Soli-Soil when compacted has a surface uniformity allowing surface sheet flow and minimizing channeling, which is a cause of erosion at many sites.
- Prevention of Unsightliness
Soli-Soil provides a uniform product in terms of color, appearance, and ability to control blowing litter and debris. Its soil-like qualities allow for ease in handling during daily closure operations (working face). Its ability to cover compacted refuse is superior to sand and course soils.
- Compaction to Six Inch Minimum Thickness
Soli-Soil compacts well under wheel/track pressures of standard landfill equipment. Compactor characteristics are similar to soils allowing for placement of a six-inch compacted cover layer with only minimal additional soil volumes.
Soli-Soil is superior in many ways to soils typically available on-site for use as daily and intermediate cover. However, product limitations do exist. Soli-soil is like fine grained clay-like soils. It is therefore not recommended to use Soli-Soil in high traffic areas where load bearing compacities are critical. When used in such situations dust can be generated.
As with clays, Soli-Soil will become slick and somewhat adhesive when saturated with water. It is considered prudent operationally to have other courser soils available during wet weather operations.