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Sample text

Consideration of the minimum rate of flow is necessary in the design of certain elements, such as grit chambers, measuring devices and dosing equipment; for this purpose, 40 percent of the average flow rate will be used. b. Average daily wastewater flow. The average daily wastewater flow to be used in the design of new treatment plants will be computed by multiplying the design population by the per capita rates of flow determined from table 4-2, and then adjusting for such factors as industrial wastewater flow, stormwater inflow and infiltration.

It is necessary that a distinction be made between upgrading to accommodate higher hydraulic and organic loads, and upgrading to meet stricter treatment requirements. Existing facilities can be made to handle higher hydraulic and organic loads by process modifications, whereas meeting higher treatment requirements usually requires significant expansion and/or modification of existing facilities. Additional information may be found in the EPA Manual Process Design for Upgrading Existing Wastewater Treatment Plants.

C. Request for waiver of the above requirement, with supporting justification, will be forwarded through command channels to HQDA (CEEC-EB) WASH DC 20314-1000 for Army projects and HQ USAF/LEEE WASH DC 20322 for Air Force projects. 5-3. Impact on receiving waters. The toxicity, coliform count, biochemical oxygen demand, chemical oxygen demand, settleable solids, and nutrient load of the waste stream must be considered in determining its impact on the receiving waters. The impact is dependent on the ability of the receiving water to assimilate the waste stream.

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