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A septic tank is an underground chamber made of concrete, fiberglass, or plastic through which domestic wastewater flows for basic sewage treatment. [2] Settling and anaerobic digestion processes reduce solids and organics, but the treatment efficiency is only moderate (referred to as "primary treatment"). [2]
The mound system was designed in the 1930s by the North Dakota College of Agriculture. [1] and was known as the Nodak Disposal System.In 1976, the University of Wisconsin studied the design of mound systems as part of the university's Waste Management Project.
Special assessments require a finding that the public improvement is "needed" for a reason consistent with the law which permits the special assessment and that each property specially assessed receives a unique, measurable and direct benefit from the public improvement that was needed.
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To implement TMDLs with point sources, wasteload allocations are incorporated into discharge permits for these sources. [13] The permits are issued by EPA or delegated state agencies under the National Pollutant Discharge Elimination System . Nonpoint source discharges (e.g. agriculture) are generally in a voluntary compliance scenario.
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