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<br />PGSF WMVD Storm and Combined Sewer - Construction Package 2 Erosion and Sedimentation Control <br />Project No. 180162 31 25 00 - 17 <br /> <br />2. Install diversion dikes or swales to collect and route water to the slope drain at the <br />top of the slope. <br />3. The soils around and under the pipe and entrance section shall be compacted to <br />prevent undercutting. <br />4. The pipe shall be secured to prevent movement. <br />5. The area below the outlet shall be stabilized with an energy dissipation structure. <br />M. Sediment Ponds and Traps <br />1. Divert all stormwater runoff from the construction area to a sediment pond, sediment <br />trap, or enhanced treatment system before disposal. <br />2. Provide overflow structure and piping for each sediment pond and sediment trap, <br />where shown on the approved TESC Plan. <br />3. Immediately inform the Owner’s Representative whenever an overflow from any of <br />the sediment ponds or traps is imminent. <br />N. Catch Basin Closure and Sump Pump System <br />1. Install a properly sized plug in the underground pipe outlet when site water discharge <br />to a catch basin in a drainage system, public or private, exceeds 25 NTU. <br />2. Install an automated electrical sump pump in the basin and pump site water <br />exceeding 25 NTU to the site discharge location per Section 31 23 19, DEWATERING. <br />3.05 MAINTENANCE <br />A. Inspect, maintain, and repair measures on a regular basis to assure continued <br />performance. <br />1. Maintain and modify the measures throughout construction to meet specified and/or <br />permit requirements and as indicated in the TESC Plan. <br />2. If erosion is occurring, immediately make modifications to stop erosion and to <br />mitigate the sedimentation. <br />3. If temporary measures are no longer needed, they may be removed with the approval <br />of a revised TESC Plan. <br />4. Repair or replace damaged or missing items immediately. <br />5. Maintain seeded surfaces throughout construction. <br />6. Inspect each TESC measure daily and immediately after each rainfall event greater <br />than 0.1 inch of rainfall in 24 hours per paragraph 3.02.C.2 and perform proper <br />maintenance as required. <br />B. Sediment Removal <br />1. Remove accumulated sediments from sediment ponds and traps when the <br />accumulated sediment depth reaches 12 inches. <br />2. Remove sediment from behind silt fences when deposits are 6 inches deep or <br />greater. <br />a. Inspect uphill side of silt fence for signs of fence clogging, acting as a barrier to <br />flow, and causing channelization of flows parallel to fence. Remove trapped <br />sediment and replace silt fence. <br />b. Replace filter fabric where clogged, damaged, deteriorated due to ultraviolet light <br />breakdown, or as directed by the Owner’s Representative.