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RATIONALE - Page 3 <br /> Permit No: COG-070000 <br /> The certification rationale shall include at a minimum the name and address of <br /> the contact person, a discussion of compliance under the previous permit, if <br /> applicable, the receiving water for the discharge, number of discharge points, <br /> a determination of the need for salinity monitoring and the expiration date of <br /> the general permit certification for the specific facility. <br /> If after evaluation of the application, it is found that the general permit is <br /> not applicable to the operation, then the application will be processed as an <br /> individual permit. For an individual permit, up to 180 days will be required <br /> to process the application and issue the permit. In this case discharge cannot <br /> take place until the permit is issued and becomes effective. <br /> The general permit itself will contain the effluent limitations and the <br /> monitoring requirements for the permitted discharge points. The following text <br /> details the rationale for the conditions of the general permit. <br /> Effluent Limitations Criteria <br /> The following table presents a comparison of effluent limitations based upon <br /> State Effluent Standards (SES) and Water Quality Standards (WQS): <br /> SES WQS <br /> Total Suspended Solids, mg/1 30/45 - <br /> Oil and Grease, mg/1 10 - <br /> pH, s.u. 6.0-9.0 6.5-9.0 <br /> Salinity - <br /> Effluent limitations in the general permit are based on the selection of the <br /> most stringent limitations presented in the above table. The Permit <br /> Conditions section that follows discusses the limitations for each parameter. <br /> Permit Conditions <br /> The principal pollutants of concern in construction dewatering are: <br /> 1. Sediments (Total Suspended Solids); <br /> 2. Oil and Grease (from pumps or extraneous sources); and, <br /> 3. Added flocculents or chemicals to assist in settling. <br />