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Home My WebLink AboutS-399907KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL EROSION AND SEDIMENTATION CONTROL NOTES (1) Approval of this erosion and sedimentation control (ESC) plan does not constitute an approval of permanent road or drainage design (e.g. size and location of roads, pipes, restrictors, channels, retention facilities, utilities, etc.) (2) The implementation of these ESC plans and the construction, maintenance, replacement, and upgrading of these ESe facilities is the responsibility of the applicant/ESC supervisor until all construction is approved. (3) The boundaries of the clearing limits shown on this plan shall be clearly flagged by survey tape or fencing, if required, prior to construction (King County SWDM Appendix D). During the construction period, no disturbance beyond the clearing limits shall be permitted. The clearing limits shall be maintained by the applicant/ESC supervisor for the duration of construction. (4) Stabilized construction entrances shall be installed at the beginning of construction and maintained for the duration of the project. Additional measures, such as constructed wheel wash systems or wash pads, may be required to ensure that all paved areas are kept clean and track out to road right of way does not occur for the duration of the project. (5) The ESC facilities shown on this pion must be constructed prior to or in conjunction with all clearing and grading so as to ensure that the transport of sediment to surface waters, drainage systems, flow control BMP locations (existing and proposed), and adjacent properties is minimized. (6) The ESC facilities shown on this plan are the minimum requirements for anticipated site conditions. During the construction period, these ESC facilities shall be upgraded as needed for unexpected storm events and modified to account for changing site conditions (e.g. additional cover measures, additional sump pumps, relocation of ditches and silt fences, perimeter protection etc.). (7) The ESC facilities shall be inspected daily by the applicant/ESC supervisor and maintained to ensure continued proper functioning. Written records shall be kept of weekly reviews of the ESC facilities. (8) Any areas of exposed soils, including roadway embankments, that will not be disturbed for two days during the wet season or seven days during the dry season shall be immediately stabilized with the approved ESC cover methods (e.g., seeding, mulching, plastic covering, etc.). (9) Any area needing ESC measures, not requiring immediate attention, shall be addressed within seven (7) days. (10) The ESC facilities on inactive sites shall be inspected and maintained a minimum of once a month (more frequently as required by the DPER site inspector) or within 24 hours following a storm event. (11) At no time shall more than one (1) foot of sediment be allowed to accumulate within a catch basin. All catch basins and conveyance lines shall be cleaned prior to paving. The cleaning operation shall not flush sediment —laden water into the downstream system. (12) Any permanent retention/detention facility used as a temporary settling basin shall be modified with the necessary erosion control measures and shall provide adequate storage capacity. If the permanent facility is to function ultimately as an infiltration system, the temporary facility must be rough graded so that the bottom and sides are at least three feet above the final grade of the permanent facility. Flow controlBMP facility areas (existing or proposed) shall not be used as temporary facilities and shall be protected from sedimentation and intrusion. (13) Cover measures will be applied in conformance with Appendix 0 of the King County Surface Water Design Manual. (14) Prior to the beginning of the wet season (Oct. 1), all disturbed areas shall be reviewed to identify which ones can be seeded in preparation for the winter rains. Disturbed areas shall be seeded within one week of the beginning of the wet season. A sketch map of those areas to be seeded and those areas to remain uncovered shall be submitted to the DPER inspector for review. CONSTRUCTION STORMWATER POLLUTION PREVENTION RECOMMENDED CONSTRUCTION SEQUENCE (1) Pre —construction meeting. (2) Post sign with name and phone number of CSWPP/ESC supervisor (may be consolidated with the required notice of construction sign). (3) Flag or fence clearing limits. (4) Install catch basin protection and flow control BMP area protection as required. (5) Grade and install construction entrance(s). (6) Install perimeter protection (silt fence, brush barrier, etc.). (7) Construct sediment ponds and traps. (8) Grade and stabilize construction roads. (9) Construct surface water controls (interceptor dikes, pipe slope drains, etc.) simultaneously with clearing and grading for project development. Construct SWPPS controls in anticipation of scheduled construction activity (e.g., concrete —related pH measures for utility, vault or roadway construction) (10) Maintain erosion control and SWPPS measures in accordance with King County standards and manufacturer's recommendations. (11) Relocate erosion control and SWPPS measures or install new measures so that as site conditions change the erosion and sediment control and pollutant protection is always in accordance with the King County Construction Stormwater Pollution Prevention Standards. (12) Cover all areas that will be unworked for more than seven days during the dry season or two days during the wet season with straw, wood fiber mulch, compost, or equivalent. (13) Stabilize oil areas that reach final grade within seven days. (14) Seed or sad any areas to remain unworked for more than 30 days. (15) Upon completion of the project, all disturbed areas must be stabilized and BMPs removed if appropriate. TOUMA ENGINEERS AND LAND SURVEYQRS,PLLC 255 SW 41st STREET N RENTON, WA 98057 PHONE (425) 251-0665 FAX (425) 251-0625 NO. PORTION OF THE NE 1 /4 OF THE NW 1 /4 SECTION 14, TOWNSHIP 23 NORTH, RANGE 5 EAST, CITY OF RENTON, STATE OF WASHINGTON STRAW ROLLS MUST BE PLACED ALONG SLOPE CONTOURS '— 10 25' (3-8m) ROLL SPACING DEPENDS ON SOIL' TYPE AND SLOPE STEEPNESS LIVE (1.2m7"1 ADJACENT ROLLS SHALL TIGHTLY ABUT SEDIMENT, ORGANIC MATTER, AND NATIVE SEEDS ARE CAPTURED BEHIND THE ROLLS 8"-10" DIA. (200-250mm) :AW WATTLES 1" x 1" STA E NTS NOTES: 1. STRAW ROLL INSTALLATION REQUIRES THE PLACEMENT AND SECURE STAKING OF THE ROLL IN A TRENCH, 3" x 5" (75-125mm) DEEP, DUG ON CONTOUR. 2. RUNOFF MUST NOT BE ALLOWED TO RUN UNDER OR AROUND ROLL. REVISION BY I DATE I APPR SURVEYM. TOUMA ° ouMA DINO: DAN CHEMM M HT W.M. s�. BUIIT" NOTE: "AS -BUILT" IS BASED ON A ACTUAL FIELD SURVEY BY TOUMA ENGINEERS AND INFORMATION SUPPLIED BY CONTRACTOR. 1 "= 20' F NM ()HE 04(;H SCALE Xf00MLY ►aPOzoK: ww M�,i0, CITY OF RENTON Planning/Building/Public Works Dept. 847D �tl TONAL S-- 3C)9901 APPROVED FOR CONSTRUCTION SUBJECT TO ERRORS AND OMISSIONS 156th AVE SE SEWER EXTENSION 1n7/201E KING COUNTY EROSION CONTROL NOTES PERMIT NUMBER C 18000328 917003B 00 Cal 0 CD 0 00 `_ 0 O 0 Q 0 00 No III V) QO In It—