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Stormwater Pollution Prevention Plan <br /> more of the alternative BMPs listed in Appendix C after the first sign that existing BMPs are <br /> ineffective or failing. <br /> The project site is located west of the Cascade Mountain Crest. As such, all temporary on-site <br /> conveyance channels shall be designed, constructed, and stabilized to prevent erosion from the <br /> expected peak 10 minute velocity of flow from a Type 1 A, 10-year, 24-hour recurrence interval <br /> storm for the developed condition. Alternatively,the 10-year, 1-hour peak flow rate indicated by <br /> an approved continuous runoff simulation model, increased by a factor of 1.6, shall be used. <br /> Stabilization, including armoring material, adequate to prevent erosion of outlets, adjacent <br /> streambanks, slopes, and downstream reaches shall be provided at the outlets of all conveyance <br /> systems. <br /> 3.1.9 Element#9—Control Pollutants <br /> All pollutants, including waste materials and demolition debris, that occur onsite shall be <br /> handled and disposed of in a manner that does not cause contamination of stormwater. Good <br /> housekeeping and preventative measures will be taken to ensure that the site will be kept clean, <br /> well organized, and free of debris. If required, BMPs to be implemented to control specific <br /> sources of pollutants are discussed below. <br /> Sanitary wastewater: <br /> • Portable sanitation facilities will be firmly secured, regularly maintained, <br /> and emptied when necessary. <br /> • Wheel wash or tire bath wastewater shall be discharged to a separate on- <br /> site treatment system or to the sanitary sewer as part of Wheel Wash <br /> implementation (BMP C 106). <br /> The facility does not require a Spill Prevention, Control,and Countermeasure (SPCC) Plan under <br /> the Federal regulations of the Clean Water Act(CWA). <br /> 3.1.10 Element#10—Control Dewatering <br /> There will be no dewatering as part of this construction project. <br /> 3.1.11 Element#11 —Maintain BMPs <br /> All temporary and permanent erosion and sediment control BMPs shall be maintained and <br /> repaired as needed to assure continued performance of their intended function. Maintenance and <br /> repair shall be conducted in accordance with each particular BMPs specifications (attached). <br /> Visual monitoring of the BMPs will be conducted at least once every calendar week and within <br /> 24 hours of any stormwater or non-stormwater discharge from the site. If the site becomes <br /> • <br /> 10 <br />