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d. Construction phasing/sequence and general BMP implementation schedule. <br /> e. The actions to be taken if BMP performance goals are not achieved—for <br /> example,a contingency plan for additional treatment and/or storage of <br /> stormwater that would violate the water quality standards if discharged. <br /> f. Engineering calculations for ponds, treatment systems, and any other designed <br /> structures. <br /> 2. The Permittee must modify the SWPPP if, during inspections or investigations <br /> conducted by the owner/operator,or the applicable local or state regulatory <br /> authority, it is determined that the SWPPP is,or would be,ineffective in <br /> eliminating or significantly minimizing pollutants in stormwater discharges from <br /> the site.The Permittee must then: <br /> a. Review the SWPPP for compliance with Special Condition S9 and make <br /> appropriate revisions within 7 days of the inspection or investigation. <br /> b. Immediately begin the process to fully implement and maintain appropriate <br /> source control and/or treatment BMPs as soon as possible,addressing the <br /> problems no later than 10 days from the inspection or investigation. If <br /> installation of necessary treatment BMPs is not feasible within 10 days,Ecology <br /> may approve additional time when an extension is requested by a Permittee <br /> within the initial 10-day response period. <br /> c. Document BMP implementation and maintenance in the site log book. <br /> The Permittee must modify the SWPPP whenever there is a change in design, <br /> construction,operation, or maintenance at the construction site that has, or could <br /> have,a significant effect on the discharge of pollutants to waters of the State. <br /> C. Stormwater Best Management Practices (BMPs) <br /> BMPs must be consistent with: <br /> 1. Stormwater Management Manual for Western Washington(most current approved <br /> edition at the time this permit was issued), for sites west of the crest of the Cascade <br /> Mountains; or <br /> 2. Stormwater Management Manual for Eastern Washington(most current approved <br /> edition at the time this permit was issued), for sites east of the crest of the Cascade <br /> Mountains; or <br /> 3. Revisions to the manuals listed in Special Condition S9.C.1. &2., or other <br /> stormwater management guidance documents or manuals which provide an <br /> equivalent level of pollution prevention,that are approved by Ecology and <br /> incorporated into this permit in accordance with the permit modification <br /> requirements of WAC 173-226-230; or <br /> 1 <br /> Construction Stormwater General Permit 1 <br /> Page 28 <br /> 1 <br />