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Pond liners need to be protected from sharp objects (for example, stones) below the liner and from being punctured by any objects in the water body. Protection can be provided with layers of sand, geotextiles (particularly needle-punched nonwovens) and other materials. Pond liners are manufactured in rolls or accordion-folded on pallets.
Existing ash ponds that are contaminating groundwater must stop receiving CCR, and close or retrofit with a liner. Existing ash ponds and landfills must comply with structural and location restrictions, where applicable, or close. A pond no longer receiving CCR is still subject to all regulations unless it is dewatered and covered by 2018.
Peak usage of waste ponds in the United States occurred in the period 1955 to 1985, after which the environmental risks of pond technology were sufficiently understood, [5] such that alternative technologies [clarification needed] for waste disposal gradually began to displace many of the waste ponds. Waste ponds often have pond liners, such as ...
Each pond liner is prone to leakage and requires regular maintenance. [2] The contents of the evaporation pond depend on the use, the evaporation pond will contain water and the desired contents hoping to be extracted. The desired contents range from waste to minerals, and the remaining contents are either stored or extracted. [2]
The basins are designed to allow relatively large flows of water to enter, but discharges to receiving waters are limited by outlet structures that function only during very large storm events. Retention ponds are often landscaped with a variety of grasses , shrubs , and/or aquatic plants to provide bank stability and aesthetic benefits.
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