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4 . Schematic Flow Diagram — For each major activity in which wastewater is or will be <br /> generated , draw a diagram of the flow of materials , products , water and wastewater from <br /> the start of the activity to its completion , showing all unit processes . Indicate which <br /> processes use water and which generate waste streams . Include the average daily <br /> volume and maximum daily volume of each waste stream (new facilities may estimate ) . <br /> If estimates are used for flow data this must be indicated . Number each unit process <br /> having wastewater discharges to the community sewer. Use these numbers when <br /> showing the unit processes in the building layout in Section H . This drawing must be <br /> certified by a State Registered Professional Engineer. <br />