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Stormwater Pollution Prevention Plan <br /> quality. The following BMPs are directed at"end of pipe"treatment for sedimentation issues <br /> related to turbid runoff from construction sites. Effective BMPs are most often the simple BMPs, <br /> and focus on the minimization of erosion before sedimentation is an issue. The following BMPs <br /> will most likely be implemented only after other BMP options are exhausted or if the <br /> construction activity is large and off site sedimentation or turbid runoff occurs or is inevitable. <br /> For BMP 250 written pre-approval through Ecology is required. <br /> Construction Stormwater Chemical Treatment(BMP C250) <br /> Construction Stormwater Filtration (BMP C251) <br /> • <br /> 14 <br />