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Home My WebLink AboutR-394408SE 1/4 , SECTION 26, TOWNSHIP 23N, RANGE 4 E, W.M. I— Z w 5 w U Q J n w m Q J U) LL a J a Z _O (D w tY Z O U (D Z V to J w I) J O !Y I— Z O U Z _O () O Iz w D.2.1.1 CLEARING LIMITS Prior to any site clearing or grading, those areas that are to remain undisturbed during project construction shall be delineated. At a minimum, clearing limits shall be installed at the edges of all critical area buffers and any other areas required to be left uncleared such as portions of the site subject to clearing limits under RMC 4-4-060, areas around significant trees identified to be retained, on -site BMP areas to be protected, and other areas identified to be left undisturbed to protect sensitive features. Purpose: The purpose of clearing limits is to prevent disturbance of those areas of the project site that are not designated for clearing or grading. This is important because limiting site disturbance is the single most effective method for reducing erosion. Clearing limits may also be used to control construction traffic, thus reducing the disturbance of soil and limiting the amount of sediment tracked off site. When to Install: Clearing limits shall be installed prior to the clearing and/or grading of the site. Measures to Use: Marking clearing limits by delineating the site with a continuous length of brightly colored survey tape is sometimes sufficient. The tape may be supported by vegetation or stakes, and it shall be 3 to 6 feet high and highly visible. Critical areas and their buffers require more substantial protection and shall be delineated with plastic or metal safety fences or stake and wire fences. Fencing may be required at the City's discretion to control construction traffic or at any location where greater protection is warranted. Permanent fencing may also be used if desired by the applicant. Silt fence, in combination with survey flagging, is also an acceptable method of marking critical areas and their buffers. D.2.1.1.1 PLASTIC OR METAL FENCE Code: FF. Symbol: I Purpose Fencing is intended to (1) restrict clearing to approved limits; (2) prevent disturbance of critical areas, their buffers, and other areas required to be left undisturbed; (3) limit construction traffic to designated construction entrances or roads; and (4) protect areas where marking with survey tape may not provide adequate protection. Conditions of Use To establish clearing limits, plastic or metal fence may be used: 1. At the boundary of critical areas, their buffers, and other areas required to be left uncleared. 2. As necessary to control vehicle access to and on the site (see Sections D.2.1.4.1 and D.2.1.4.2). Design and Installation Specifications l . The fence shall be designed and installed according to the manufacturer's specifications. 2. The fence shall be at least 3 feet high and must be highly visible. 3. The fence shall not be wired or stapled to trees. Maintenance Requirements 1. If the fence has been damaged or visibility reduced, it shall be repaired or replaced immediately and visibility restored. 2. Disturbance of a critical area, critical area buffer, native growth retention area, or any other area required to be left undisturbed shall be reported to the City for resolution. WORKING LIMITS AND HIGH VISIBILITY FENCE C5� APPENDIX D, D.2.1.1.1 OF 2017 CITY OF RENTON SURFACE WATER DESIGN MANUAL EROSION CONTROL DETAILS -I D.2.1.2.2 MULCHING Code: MU Purpose Symbol: _ Mu � 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 may 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. Design and Installation Specifications For mulch materials, application rates, and specifications, see Table D.2.1.2.A. Note: Thicknesses may be increased for disturbed areas in or near critical areas or other areas highly susceptible to erosion. Maintenance Standards 1. The thickness of the cover must be maintained. 2. Any areas that experience erosion shall be remulched and/or protected with a net or blanket. If the erosion problem is drainage related, then the drainage problem shall be assessed and alternate drainage such as interceptor swales may be needed to fix the problem and the eroded area remulched. TABLE D.2.1.2.A MULCH STANDARDS AND GUIDELINES Mulch Quality Standards Application Remarks Material Rates Straw Air-dried; free from Z-3" thick; Cost-effective protection when applied with undesirable seed and 5 bales per adequate thickness. Hand -application generally coarse material 1,000 sf or 2— requires greater thickness than blown straw. Straw 3 tons per acre should be crimped to avoid wind blow. The thickness of straw may be reduced by half when used in conjunction with seeding. Wood Fiber No growth inhibiting Approx. 25-30 lbs Shall be applied with hydromulcher. Shall not be ('PIll1InsP fartnrs pPr 1,onn sf nr used withnut sPPd and tackifiPr i1nlPgs the 1,500-2,000 Ibs application rate is at least doubled. Some wood per acre fiber with very long fibers can be effective at lower application rates and without seed or tackifier. Compost No visible water or 2" thick min.; More effective control can be obtained by dust during handling. approx. 100 tons increasing thickness to 3" (2.25 cubic feet per Must be purchased per acre (approx. square yard). Excellent mulch for protecting final from supplier with 1.5 cubic feet per grades until landscaping because it can be directly Solid Waste Handling square yard) seeded or tilled into soil as an amendment. Permit. Compost may not be used in Sensitive Lake7 basins unless analysis of the compost shows no phosphorous release. Hydraulic This mulch category Apply at rates The BFM shall not be applied immediately before, Matrices includes hydraulic from 3,000 Ibs per during or immediately after rainfall so that the (Bonded slurries composed of acre to 4,000 Ibs matrix will have an opportunity to dry for 24 hours Fiber Matrix wood fiber, paper per acre and after installation. Application rates beyond 2,500 [BFM]) fiber or a based on pounds may interfere with germination and are not combination of the manufacturers usually recommended for turf establishment. BFM two held together by recommendations is generally a matrix where all fiber and binders a binding system. are in one bag, rather than having to mix The BFM shall be a components from various manufacturers to create mixture of long wood a matrix. BFMs can be installed via helicopter in fibers and various remote areas. They are approximately $1,000 per bonding agents. acre cheaper to install. Chipped Site Average size shall be 2" minimum This is a cost-effective way to dispose of debris Vegetation several inches. thickness from clearing and grubbing, and it eliminates the problems associated with burning. Generally, it should not be used on slopes above approx. 10% because of its tendency to be transported by runoff. It is not recommended within 200 feet of surface waters. If seeding is expected shortly after mulch, the decomposition of the chipped vegetation may tie up nutrients important to grass establishment. 0 MULCH C5.2 APPENDIX D, D.2.1.2.2 OF 2017 CITY OF RENTON SURFACE WATER DESIGN MANUAL NI-1.1 I E O 0 Ln 6 N SURVEYED: SCALE: AALA HORIZONTAL: NAD 19 3/1991 o DESIGNED: AS NOTED GXLE DRAWN: SGR ONE INCH DATUM CHECKED: AGG AT FULL SCALE g IF NOT ONE INCH w NO. REVISION BY DATE AP P R APPROVED: AGC SCALE ACCORDINGLY CITY OF RENTON f."R NUIV Planning/Building/Public Works Dept A O CV I CV CV 0 A CALL BEFORE YOU DIG Call: TOLL FREE —800-424-5555 IN COMPLIANCE WITH CITY OF RENTON STANDARDS SURFACE WATER UTILITY DEVELOPMENT ENGINEERING rstraka 11 /29/2018 rnair 11 /30/2018 WICCIAVID EVANS ANDASSOCIATES INC. 14432 SE Eastgate Way, Suite 400 Bellevue Washington 98007 KING COUNTY REGIONAL DATE. 1/3/2018 AFIS LAB REPLACEMENT FIELDBOOK: PAGE: EROSION CONTROL C5.2 DETAILS -I SHEET:9 OF:135 U N co CD CD CD T Q 00 CD CD CD I ti T 7 I— Z w 2 w U Q J a_ LLJ C0 Q J W H a J z _O (D w z O U (D Z Y R-399408