Moretrench knows groundwater. In fact we invented the first practical wellpoint in 1924 and have been utilizing wellpoints and deep wells for construction pre-drainage ever since. We also know soils, and just as importantly, we have worked with industrial clients to stabilize industrial waste by-product such as gypsum and ash since the 1980s. More recently, we have been applying our by-product dewatering knowledge and experience to ash ponds in order to expedite closure, with proven success, and we are ready to work with you to develop and implement the right approach for your facility.
Stabilizing ash ponds for safe and efficient ash removal presents very specific challenges. Every pond is different. There are variations in the type of coal burned, boiler performance, method of ash transportation, ash deposition at the pond, subsurface soils, and size, shape and settlement profile of the pond. Conditions can also vary widely within individual ponds. Grain-size of the ash material will vary from coarse to fine between the deposition point and the pond outfall.
Effective stabilization therefore requires a site-specific, engineered approach beginning with a geotechnical investigation and in situ testing to determine the hydrogeologic behavior of the pond. These initial critical steps will reveal vital information about the properties and behavior of the ash, and if relevant, the underlying soil which will assist in developing the optimum approach to pre-drainage dewatering – whether deep wells or wellpoints are required, and the number, depth of installation and arrangement of the dewatering devices. Treatment of pumped water is typically required as part of the overall closure plan, and perimeter sub-surface cut-off barriers and dam/levee rehabilitation may also be required.
Contact us to talk with one of our key ash pond service specialists today.