10521 19TH AVE SE 2022-05-23 - Laserfiche WebLink

Silver Lake Plaza Minimum Requirement # 2: SWPPP Narrative Element #1: Mark Clearing Limits Clearing limits have been shown on the SWPPP Plan. Element #2: Establish Construction Entrance A temporary construction entrance at the southwest corner of the site connecting to 19th Avenue SE has been shown on the SWPPP plan. All vehicles shall be free of debris prior to leaving the site. Element # 3: Control Flow Rates Flow rates during construction are to be contained through the installation of a temporary silt fencing on the south and west sides of the site. Element # 4: Install Sediment Controls Sediment controls mainly consist of installation of a temporary silt fencing on the south and west sides of the site. Element # 5: Stabilize Soils All soils disturbed during site grading will be stabilized by use of the most appropriate BMP method available. These consist of short-term and long-term solutions. Short-term methods consist of compaction of the soils by vibratory roller or bulldozer. Long-term methods consist of straw covering over the soils (this is in the case of the project becoming dormant for greater than 1 month). At this time no wintertime grading or construction activities will occur. During construction periods longer than 1 working week (7 days) where the soils are exposed and un-worked will use the proscribed methods in the Storm Water Management Manual for Western Washington to reduce sedimentation transported offsite. If winter grading is conducted, all exposed soils shall be covered within 2 days. Element # 6: Protect Slopes No steep slopes exist on -site; steep slope protection is not required. Element # 7: Protect Drain Inlets All catch basins within 500 feet downstream of the site will be protected with catch basin sediment inserts. Element # 8: Stabilize Channels and Outlets Channels and drainage outlets are not needed around the proposed development area on site. No stabilization is necessary. Existing channels or drainage outlets located within 500- feet of the property of the property should be routinely inspected for debris that may dam and/or aid erosion. Element # 9: Control Pollutants All pollutants from construction vehicles will be contained and disposed of in the approved manner consistent with state environmental policies. Any vehicle maintenance will be performed by authorized mechanics using drip pans and waste containment vessels. All pollutants will be disposed offsite at approved facilities. WESTERN ENGINEERS, INC. 12 PROJECT: 15-1415-A