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General Minimal Discharge Permit Rationale <br />Permit No. COG-600000 <br />Page 19 <br />V. TERMS AND CONDITIONS OF PERMIT <br />K. Best Manaremeu Practices: (cou.) <br />Discharges drat may cocain oil or grease shall be treated with oil absorbeu booms, sorbs, <br />pads, or directed through a filter structure couaining oil absorbing material before <br />discharge. An oil/water separator may be needed to comply with the e,Qitteu limitations. For <br />spills or puddles of oil, use a dry absorbeu product to soak up the liquid oil and sweep and <br />dispose of properly before washing surh surfacer. <br />For discharges from swimming pools, of super chlorinated water from the disinfection of <br />parable water lines, parable water strutxures, or other chloruutted water, chlorine shall be <br />minimized by either chemical or physical means. Chlorine may be neutralized by the addition <br />of sodium thiosulfate or similar sulfate compounds to the water. (Seek advice on compound <br />type and dosage necessary from qual{f~ed chemist or ehemita! supplier). Chlorine and <br />bromine may be naturally volatilized by allowing the water to set for a sufftdent time for the <br />chlorine/bromine to dissipate. Time needed for dispersal will vary with temperature, amount <br />of water, and concentration. Aeration and agitation of the water will speed this procus. <br />Total suspended solids can be reduced by frhering the disrharge, by directing the water into <br />a settling basin and allowing the solids to settle, or by developing a clearwell and pumping <br />from this structure in the case of groundwater discharger. <br />Check damn buill of a row of eurenched hay bales anchored with wood or steel fence posts, <br />or piles of 4-6 inch rock can be used between discharge and receiving streams to causal <br />velodry of water thereby slowing erosion and also have a filtering effect. Silt fences properly <br />staked and with the bottom edge buried in a 4x4 inch trench upslope of the stakes can help <br />reduce suspended solids from euering the receiving stream. <br />Sedimeu basiru may be bulb by constructing an earthen embanbnent across a drainage way <br />or forming a dam of entrenched and staked hay bales across the drainage way. <br />Storm drains may be protected from sediments by surrounding [he drain with hay bales will <br />allow water to filter through iuo the drain leaving the solids behind. Also dratrts can be <br />surrounded by concrete blocks, covered with wire screen, and I.5 inch gravel piled up to the <br />drain to filler water and cause a ponding affect that will allow sediments to settle out. <br />L. Duration of Permit: The permit shall not exceed five years in duration. The permittee's <br />authoriry to discharge under this permit is approved until the expiration date of the general <br />permit. The permittee must apply for recertification under the general permit at least 180 <br />days prior to its expiration date. In cases where the applicant states [liar the discharge is ro <br />last less than 3 mouhs, it will be noted on the certi, fication for that fadlity that it is a "short <br />term certification. Shoe term cerdfrcarions will expire automatically 3 mouhs after the <br />effective date. Inactivation of short term cerYifrcarioru will not be necessary if discharge lasts <br />only a fraction of the 3 mach period. <br />Tom Boyce <br />April, 1995 <br />