3214 BROADWAY BROADWAY KINECT APARTMENTS 2021-08-11

• ' CITY OF EVERETT STORMWATER MANAGEMENT MANUAL • • Table 3.6 Meadow Seed Mix • % % % • Weight Purity Germination • Redtop or Oregon bentgrass 20 92 85 • Agrostis alba or Agrostis oregonensis Red fescue 70 98 90 • Festuca rubra • White dutch clover 10 98 90 • Trifolium repens • Maintenance Standards • 1. Any seeded areas that fail to establish at least 80 percent cover(100 percent cover for areas that • receive sheet or concentrated flows) shall be reseeded. If reseeding is ineffective, an alternate • method, such as sodding, mulching, or nets/blankets, shall be used. If winter weather prevents adequate grass growth,this time limit may be relaxed at the discretion of the City when sensitive • areas would otherwise be protected. • 2. After adequate cover is achieved, any areas that experience erosion shall be reseeded and • protected by mulch. If the erosion problem is drainage related, the problem shall be fixed and the eroded area reseeded and protected by mulch. 3. Seeded areas shall be supplied with adequate moisture,but not watered to the extent that it causes • runoff. • 3.2.8 BMP C121: Mulching • • Purpose The purpose of mulching soils is to provide immediate temporary protection from erosion. Mulch also • enhances plant establishment by conserving moisture,holding fertilizer, seed, and topsoil in place, and moderating soil temperatures. There is an enormous variety of mulches that can be used. Only the most • common types are discussed in this section. • Conditions of Use • As a temporary cover measure,mulch should be used: • 1. On disturbed areas that require cover measures for less than 30 days • 2. As a cover for seed during the wet season and during the hot summer months • 3. During the wet season on slopes steeper than 3H:1 V with more than 10 feet of vertical relief • 4. Mulch may be applied at any time of the year and must be refreshed periodically. • Design and Installation Specifications • I. For mulch materials, application rates, and specifications, see Table 3.7. • 2. Mulch used within the ordinary high-water mark of surface waters shall be selected to minimize • potential flotation of organic matter. Composted organic materials have higher specific gravities • (densities)than straw, wood, or chipped material. • Maintenance Standards • 1. The thickness of the cover must be maintained • • Volume 11—Construction Stormwater Pollution Prevention • 3-14 • •