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The Eielson AFB Water Treatment Plant uses six manganese oxide coated pressurized sand filters to remove the iron and manganese out of the bases drinking water. When the filters are backwashed, the ba... The Eielson AFB Water Treatment Plant uses six manganese oxide coated pressurized sand filters to remove the iron and manganese out of the bases drinking water. When the filters are backwashed, the backwash water is sent to a settling pond where the suspended matter settles out of the water. Over the years of backwashing the filters, there has been an accumulation of sediment in the settling pond which has reduced the depth to about 80% of its original capacity. The dimension of the pond is roughly 210 feet by 68 feet by 5 feet and has a capacity of approximately 306,000 gallons of water. The estimated amount of sediment accumulation is approximately two to three feet in the bottom of the settling pond, approximately 188,500 gallons, 800 cu. yards. The sediment is high in water content and must be de-watered to meet the requirement for no free liquids as determined by the “Paint Filter Liquids Test”. The personnel at the Water Treatment Plant will collect a composite sample of the sediment and have it tested in accordance with the Toxicity Characteristic Leaching Procedure, test method 1311 as mentioned in 40 CFR 261.24 to ensure that the sediment is within the parameters for disposal