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However,the dewatering of soils known to be free of contamination will trigger BMPS to trap sediment <br /> and reduce turbidity. At a minimum,geotextile fabric socks/bags/cells will be used to filter this material. <br /> Other BMPs to be used for sediment trapping and turbidity reduction include the following: <br /> • Use of a sedimentation bag, with outfall to a ditch or swale for small volumes of localized <br /> dewatering. <br /> Alternate dewatering control BMPS are included in Appendix C as a quick reference tool for the on-site <br /> inspector in the event the BMP listed above is deemed ineffective or inappropriate during construction <br /> to satisfy the requirements set forth in General NPDES permit(Appendix D).To avoid potential erosion <br /> and sediment control issues that may cause a violation of the NPDES Construction Stormwater permit, <br /> the Certified Erosion and Sediment Lead will promptly initiate the implementation of one or more of the <br /> alternate BMPs listed in Appendix C after the first sign that existing BMP are ineffective or failing. <br /> 3.1.11 Element#11—Maintain BMPs <br /> All temporary erosion and sediment control BMPs shall be maintained and repaired as needed to assure <br /> continued performance of their intended function. Maintenance and repair shall be conducted in <br /> accordance with each particular BMP's specifications. Visual monitoring of the BMPS will be conducted <br /> at least once every calendar week and within 24 hours of any rainfall event that causes a discharge from <br /> the site. If the site becomes inactive, and is temporarily stabilized,the inspection frequency will be <br /> reduced to once every month. The specific BMPs that shall be used on this project include: <br /> BPM C150: Materials on Hand <br /> BMP C160: Certified Erosion and Sediment Control Lead (CESCL) <br /> All temporary erosion and sediment control BMPs shall be removed only after the GeoEngineer has <br /> determined that the BMPS are no longer required. The contractor shall remove the BMPs and all <br /> associated hardware from the project limits. Trapped sediment shall be removed or stabilized on site. <br /> Disturbed soil resulting from removal of BMPS or vegetation shall be permanently stabilized. <br /> 3.1.12 Element#12—Manage the Project <br /> Erosion and sediment control BMPs for this project have been designed based on the following <br /> principles: <br /> 13 <br />