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r <br />Modified BMP procedure shall completely block Construction Stormwater (CSW) flows from <br />entering storm water inlets. During construction, ponding at inlets shall be pumped into <br />established CSW basin as needed. <br />Alternate flow control BMPs shall be evaluated by the CESCL in the event the BMP(s) listed <br />above are deemed ineffective or inappropriate during construction to satisfy the requirements <br />set forth in the CSGP. To avoid potential erosion and sediment control issues the CESCL shall <br />promptly initiate the repair of existing BMPs or implementation of other BMPs after the first sign <br />that existing BMPs are ineffective or failing. If conditions at the site create the potential for <br />vehicles to track sediments onto public roads or other access routes not within the immediate <br />work area, the vehicle tires shall be manually brushed or scraped prior to leaving or driven over <br />rock surfaces strategically located throughout the site (e.g., a construction entrance or exit) to <br />knock sediment loose from tires. <br />In some cases, sediment discharge in concentrated runoff can be controlled using permanent <br />storm water BMPs (e.g., infiltration swales, ponds, trenches). Sediment loads can limit the <br />effectiveness of some permanent storm water BMPs, such as those used for infiltration or <br />biofiltration; however, those BMPs designed to remove solids by settling (wet ponds or detention <br />ponds) can be used during the construction phase. When permanent storm water BMPs will be <br />used to control sediment discharge during construction, the structure shall be protected from <br />excessive sedimentation with adequate erosion and sediment control BMPs. Any accumulated <br />sediment shall be removed and stockpiled as directed by the site engineer after construction is <br />complete. The permanent storm water BMP shall be re -stabilized with vegetation per applicable <br />design requirements once the remainder of the site has been stabilized. <br />West of the Cascade Mountains Crest <br />Season <br />Dates <br />Number of Days Soils Can <br />be Left Exposed <br />During the Dry Season <br />May 1 — September 30 <br />7 days <br />During the Wet Season <br />October 1 — April 30 <br />2 days <br />Anticipated project dates: <br />Activity / Phase <br />Start Date <br />End Date <br />Boulevard and Trunkline <br />Utilities Development — <br />Roadway Phase <br />8/2019 <br />8/2020 <br />Advanced Site Work Phase <br />8/2019 <br />8/2019 <br />Phase 1 Buildings and <br />Parking Lots <br />TBD <br />Phase 2 Buildings <br />TBD <br />Phase 3-5 and Site <br />TBD <br />Will you construct during the wet season? <br />❑ YesX No <br />Temporary and permanent seeding shall be performed per the specifications at a rate of <br />approximately 20 to 25 pounds per acre. The proposed seed mix is shown in Table 4 below. <br />LJ <br />1 <br />1 <br />17, <br />LJ <br />�l <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />p a ` e 1 10 <br />