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<br />Senate Bill 802 Session Law 2024-44 Page 11 <br />method shall be used to calculate the peak runoff for <br />the one-year, 24-hour precipitation event in cubic feet <br />per second. The peak runoff shall then be divided by 10 <br />and multiplied by 646,272 to convert the result to <br />gallons per day of allowable discharge at the point <br />studied. <br />II. Two million gallons per day. <br />3. All discharges shall be directed to buffer systems that utilize <br />low-energy methodologies to function as a buffer between the <br />discharge and the receiving waters. Buffer systems shall <br />consist of one of the following: <br />I. High-rate infiltration basins that may include <br />engineered materials to achieve high rates of <br />infiltration, which engineered materials shall have an <br />ASTM gradation of a fine to coarse grain sand, and <br />angular to maintain structural integrity of the slope. <br />II. Constructed free-surface wetlands having a hydraulic <br />residence time of 14 days. <br />III. Other suitable technologies that provide a physical or <br />hydraulic residence time buffer, or both, between the <br />discharge and the receiving waters. <br />4. Discharge to areas that are 50 feet upland of the receiving <br />waters or wetlands at a non-erosive velocity equal to or less <br />than 2 feet per second through an appropriately designed <br />energy dissipater, or other applicable designs, that meet the <br />standard of practice for professional engineers for such <br />devices. <br />5. Utilize more than one outfall to the receiving stream so that no <br />one outfall exceeds 1 cubic foot per second based on the <br />average daily flow of the discharge. Discharges from buffer <br />systems shall be allowed to be placed at increments along a <br />stream or receiving waters at no less than 50 linear feet. <br />6. No discharge shall be permitted to classified shellfish waters <br />(SA), tidal waters (SC), water supply waters (WS), or <br />outstanding resource waters (ORW). Discharges to unnamed <br />tributaries of classified shellfish waters, however, shall be <br />authorized in compliance with requirements of this section and <br />only when a low-risk situation is present. Discharges to <br />nutrient sensitive waters (NSW) may require additional <br />modeling and allocation of flow and will be at the discretion of <br />the Department. <br />7. The following effluent limits shall generally apply except <br />where (i) the applicant and Department agree to more stringent <br />limits or (ii) complex modeling conducted pursuant to <br />sub-sub-subdivision 8. of this sub-subdivision demonstrates <br />that Sag in the DO content of the receiving water of 0.1 mg/l <br />or less will occur and water quality standards are protected: <br />I. Biological oxygen demand (BOD5) shall not exceed 5.0 <br />mg/l monthly average. <br />II. NH3, 0.5 mg/l monthly average, 1.0 mg/l daily <br />maximum. <br />15