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HomeMy WebLinkAboutR-397111O r W 0 bi 12 O z O EROSION / SEDIMENTATION CONTROL NOTES 1. THESE NOTES SHALL APPEAR FOR ALL PROJECTS - SITE IMPROVEMENTS, SURFACE WATER UTILITY, WASTEWATER UTILITY, WATER UTILITY, AND TRANSPORTATION PLANS. 2. BEFORE ANY CONSTRUCTION OR DEVELOPMENT ACTIVITY OCCURS, A PRE -CONSTRUCTION MEETING MUST BE HELD WITH THE CITY OF RENTON, PUBLIC WORKS DESIGN ENGINEER. 3. THE BOUNDARIES OF THE CLEARING LIMITS AND AREAS OF VEGETATION PRESERVATION AS PRESCRIBED ON THE PLAN(S) SHALL BE CLEARLY FLAGGED BY SURVEY TAPE OR FENCING IN THE FIELD PRIOR TO CONSTRUCTION IN ACCORDANCE WITH APPENDIX D OF THE SURFACE WATER DESIGN MANUAL AND OBSERVED DURING CONSTRUCTION. DURING THE CONSTRUCTION PERIOD, NO DISTURBANCE BEYOND THE CLEARING LIMITS SHALL BE PERMITTED. THE CLEARING LIMITS SHALL BE MAINTAINED BY THE APPLICANT/TESC 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. ALL REQUIRED SEDIMENTATION/EROSION CONTROL FACILITIES MUST BE CONSTRUCTED AND IN OPERATION PRIOR TO LAND CLEARING AND/OR CONSTRUCTION TO PREVENT TRANSPORTATION OF SEDIMENT TO SURFACE WATER, DRAINAGE SYSTEMS AND ADJACENT PROPERTIES. ALL EROSION AND SEDIMENT FACILITIES SHALL BE MAINTAINED IN A SATISFACTORY CONDITION UNTIL SUCH TIME THAT CLEARING AND/OR CONSTRUCTION IS COMPLETE AND POTENTIAL FOR ON -SITE EROSION HAS PASSED. THE IMPLEMENTATION, MAINTENANCE, REPLACEMENT AND ADDITIONS TO EROSION/SEDIMENTATION CONTROL SYSTEMS SHALL BE THE RESPONSIBILITY OF THE PERMITEE. 6. THE EROSION AND SEDIMENTATION CONTROL SYSTEMS DEPICTED ON THIS DRAWING ARE INTENDED TO BE MINIMUM REQUIREMENTS TO MEET ANTICIPATED SITE CONDITIONS. AS CONSTRUCTION PROGRESSES AND UNEXPECTED OR SEASONAL CONDITIONS DICTATE, THE PERMITEE SHALL ANTICIPATE THAT MORE EROSION AND SEDIMENTATION CONTROL FACILITIES WILL BE NECESSARY TO ENSURE COMPLETE SILTATION CONTROL ON THE PROPOSED SITE. DURING THE COURSE OF CONSTRUCTION, IT SHALL BE THE OBLIGATION AND RESPONSIBILITY OF THE PERMITEE TO ADDRESS ANY NEW CONDITIONS THAT MAY BE CREATED BY THE ACTIVITIES AND TO PROVIDE ADDITIONAL FACILITIES, OVER AND ABOVE MINIMUM REQUIREMENTS, AS MAY BE NEEDED, TO PROTECT ADJACENT PROPERTIES AND WATER QUALITY OF THE RECEIVING DRAINAGE SYSTEM. 7. APPROVAL OF THIS PLAN IS FOR EROSION/SEDIMENTATION CONTROL ONLY. IT DOES NOT CONSTITUTE AN APPROVAL OF STORM DRAINAGE DESIGN, SIZE NOR LOCATION OF PIPES, RESTRICTORS, CHANNELS, OR RETENTION FACILITIES. 8. ANY AREAS OF EXPOSED SOILS, INCLUDING ROADWAY EMBANKMENTS, THAT WILL NOT BE DISTURBED FOR TWO DAYS DURING THE WET SEASON (OCTOBER 1ST TROUGH MARCH 30TH) OR SEVEN DAYS DURING THE DRY SEASON (APRIL 1ST TOUGH SEPTEMBER 30) SHALL BE IMMEDIATELY STABILIZED WITH THE APPROVED ESC COVER METHODS (E.G., SEEDING, MULCHING, PLASTIC COVERING, ETC.). 9. WET SEASON SEASONAL EROSION AND SEDIMENT CONTROL REQUIREMENTS APPLY TO ALL CONSTRUCTION SITES CLEARING BETWEEN OCTOBER 1 AND MARCH 30 INCLUSIVE, UNLESS OTHERWISE APPROVED BY THE CITY THROUGH AN ADJUSTMENT PROCESS. 10. COVER MEASURES WILL BE APPLIED IN CONFORMANCE WITH APPENDIX D OF THE SURFACE WATER DESIGN MANUAL. 11. ANY AREA NEEDING ESC MEASURES, NOT REQUIRING IMMEDIATE ATTENTION, SHALL BE ADDRESSED WITHIN SEVEN (7) DAYS. 12. THE ESC FACILITIES ON INACTIVE SITES SHALL BE INSPECTED AND MAINTAINED A MINIMUM OF ONCE A MONTH OR WITHIN 24 HOURS FOLLOWING A STORM EVENT. 13, 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. 14. DURING THE TIME PERIOD OF OCTOBER 1ST THROUGH MARCH 30TH, ALL PROJECT DISTRIBUTED SOIL AREAS GREATER, THAT ARE TO BE LEFT UN -WORKED FOR MORE THAN 12 HOURS, SHALL BE COVERED BY MULCH, SODDING OR PLASTIC COVERING. 15. 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. 16. 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 CITY OF RENTON FOR REVIEW. STRUCTURAL NOTES 1. THESE PLANS ARE APPROVED FOR STANDARD ROAD AND DRAINAGE IMPROVEMENTS ONLY. PLANS FOR STRUCTURES SUCH AS BRIDGES, VAULTS, AND RETAINING WALLS REQUIRE A SEPARATE REVIEW AND APPROVAL BY THE CITY PRIOR TO CONSTRUCTION. 2. ROCKERIES ARE CONSIDERED TO BE A METHOD OF BANK STABILIZATION AND EROSION CONTROL. ROCKERIES SHALL NOT BE CONSTRUCTED TO SERVE AS RETAINING WALLS. ALL ROCKERIES IN CITY ROAD RIGHT-OF-WAY SHALL BE CONSTRUCTED IN ACCORDANCE WITH CITY STANDARDS. ROCKERIES OUTSIDE OF ROAD RIGHT-OF-WAY SHALL BE CONSTRUCTED IN ACCORDANCE WITH THE INTERNATIONAL BUILDING CODE. Call 2 Working Days Before You Dig 811 Utilities Underground Location Center (ID,MT,ND,OR,WA) WET SEASON PROVISIONS NOTE: THE PROJECT EARTHWORK IS LIMITED TO SEASONALLY DRIER PERIODS (TYPICALLY APRIL 1 TO OCTOBER 31) IN ACCORDANCE WITH THE GEOTECHNICAL RECOMMENDATION MADE BY ASSOCIATED EARTH SCIENCES, INC, (DATED JANUARY 18, 2017). NOTE: THE FOLLOWING MEASURES ARE REQUIRED FOR CONSTRUCTION DURING THE WET SEASON (OCTOBER 1 - APRIL 30) IN ADDITION TO THE STANDARD TESC MEASURES. 1. THE ALLOWED TIME THAT A DISTURBED AREA MAY REMAIN UNWORKED WITHOUT COVER MEASURES IS REDUCED TO TWO CONSECUTIVE WORKING DAYS, RATHER THAN SEVEN (SECTION D.3.2). 2. STOCKPILES AND STEEP CUT AND FILL SLOPES ARE TO BE PROTECTED IF UNWORKED FOR MORE THAN 12 HOURS (SECTION D.3.2). 3. COVER MATERIALS SUFFICIENT TO COVER ALL DISTURBED AREAS SHALL BE STOCKPILED ON SITE (SECTION D.3.2). 4. ALL AREAS THAT ARE TO BE UNWORKED DURING THE WET SEASON SHALL BE SEEDED WITHIN ONE WEEK OF THE BEGINNING OF THE WET SEASON (SECTION D.3.2.5). 5. MULCH IS REQUIRED TO PROTECT ALL SEEDED AREAS (SECTION D.3.2.1). 6. FIFTY LINEAR FEET OF SILT FENCE (AND THE NECESSARY STAKES) PER ACRE OF DISTURBANCE MUST BE STOCKPILED ON SITE (SECTION D.3.3.1). 7. CONSTRUCTION ROAD AND PARKING LOT STABILIZATION ARE REQUIRED FOR ALL SITES UNLESS THE SITE IS UNDERLAIN BY COARSE -GRAINED SOIL (SECTION D.3.4.2). 8. SEDIMENT RETENTION IS REQUIRED UNLESS NO OFFSITE DISCHARGE IS ANTICIPATED FOR THE SPECIFIED DESIGN FLOW (SECTION D.3.5). 9. SURFACE WATER CONTROLS ARE REQUIRED UNLESS NO OFFSITE DISCHARGE IS ANTICIPATED FOR THE SPECIFIED DESIGN FLOW (SECTION D.3.6). 10. PHASING AND MORE CONSERVATIVE BMPS MUST BE EVALUATED FOR CONSTRUCTION ACTIVITY NEAR THE SURFACE WATERS (SECTION D.5.3). 11. ANY RUNOFF GENERATED BY DEWATERING MAY BE REQUIRED TO DISCHARGE TO THE SANITARY SEWER (WITH APPROPRIATE DISCHARGE AUTHORIZATION), PORTABLE SAND FILTER SYSTEMS, OR HOLDING TANKS. 12. THE FREQUENCY OF MAINTENANCE REVIEW INCREASES FROM MONTHLY TO WEEKLY (SECTION D.5.4). CONDITIONS FOR WET SEASON CONSTRUCTION 1. ANY CONSTRUCTION THAT WILL RESULT IN DISTURBED AREAS ON OR WITHIN A CRITICAL AREA OR ASSOCIATED BUFFER, SHALL BE SUBJECT TO THE "CRITICAL AREA RESTRICTIONS" CONTAINED IN THE ESC STANDARDS. THESE PROVISIONS INCLUDE PHASING THE PROJECT WHENEVER POSSIBLE SO THAT CONSTRUCTION IN THESE AREAS IS LIMITED TO THE DRY SEASON. 2. DURING CONSTRUCTION, ESC PLANS SHALL BE REVISED AS NECESSARY BY THE ESC SUPERVISOR OR AS DIRECTED BY THE CITY TO ADDRESS CHANGING SITE CONDITIONS, UNEXPECTED STORM EVENTS, OR NON-COMPLIANCE WITH THE ESC PERFORMANCE CRITERIA IN SECTION D.4.1 (P. D-69). IF NON-COMPLIANCE WITH THE ESC PERFORMANCE CRITERIA OCCURS, THE PLAN MUST BE UPDATED WITHIN 48 HOURS (FAILURE TO DO SO COULD RESULT IN A "STOP WORK" ORDER AS DETERMINED BY THE CITY INSPECTOR) OF INSPECTIONS OR INVESTIGATIONS. IMPLEMENTATION OF THE ONSITE CHANGES MUST OCCUR WITHIN 5 DAYS. 3. ALL ESC MEASURES SHALL BE MAINTAINED AND REVIEWED ON A REGULAR BASIS AS PRESCRIBED IN THE MAINTENANCE REQUIREMENTS FOR EACH BMP AND IN THIS SECTION. THE ESC SUPERVISOR SHALL REVIEW THE SITE AT LEAST WEEKLY DURING THE WET SEASON, AND WITHIN 24 HOURS OF SIGNIFICANT STORMS. IN GENERAL, A SIGNIFICANT STORM IS ONE WITH MORE THAN 0.5 INCHES OF RAIN IN 24 HOURS OR LESS. THE CITY MAY REQUIRE THAT A WRITTEN RECORD OF THESE REVIEWS BE KEPT ON SITE WITH COPIES SUBMITTED TO THE CITY WITHIN 48 HOURS. 250 245 240 235 EXISTING GROUND i OVERFLOW i ELEV.=239.00 TOP ELEV.= 240.00 BOTTOM ELEV.=235.50 TEMPORARY SEDIMENT TRAP #1 SECTION A -A SCALE: 1"=20' HORIZ. 1 "= 5' VERT. 0 FIRST SUBMITTAL 1 SECOND SUBMITTAL DOES N O T N C E U D E 2 THIRD SUBMITTAL ASBU ET NEORMAT ON NO. I REVISION 250 245 240 235 250 245 240 235 MULCH STANDARDS AND GUIDELINES MULCH QUALITY APPLICATION MATERIAL STANDARDS RATES REMARKS STRAW AIR-DRIED; FREE FROM 2"-3" THICK; 2-3 COST-EFFECTIVE PROTECTION WHEN APPLIED UNDESIRABLE SEED BALES PER 1000 SF OR WITH ADEQUATE THICKNESS. HAND -APPLICATION AND COARSE MATERIAL 2-3 TONS PER ACRE GENERALLY REQUIRES GREATER THICKNESS THAN BLOWN STRAW. STRAW 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 CELLULOSE FACTORS PER 1000 SF OR NOT BE USED WITHOUT SEED AND TACKIFIER 1000-1500 LBS PER UNLESS THE APPLICATION RATE IS AT LEAST ACRE DOUBLED. SOME WOOD 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 APPROX. 100 TONS INCREASING THICKNESS TO 3". EXCELLENT HANDLING. MUST BE PER ACRE (APPROX. MULCH FOR PROTECTING FINAL GRADES UNTIL PURCHASED FROM 800 LBS PER YARD) LANDSCAPING BECAUSE IT CAN BE DIRECTLY SUPPLIER WITH SOLID SEEDED OR TILLED INTO SOIL AS AN WASTE HANDLING AMENDMENT. SOURCES FOR COMPOST ARE PERMIT. AVAILABLE FROM THE KING COUNTY COMMISSION FOR MARKETING RECYCLABLE MATERIALS AT (206) 296-4439. CHIPPED SITE AVERAGE SIZE SHALL 2" MINIMUM THIS IS A COST-EFFECTIVE WAY TO DISPOSE OF VEGETATION BE SEVERAL INCHES. THICKNESS DEBRIS 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. EXISTING GROUND i i i / TOP ELEV.- OVERFLOW 240.00 ELEV.=239.00 1 BOTTOM ELEV.=235.50 TEMPORARY SEDIMENT TRAP #2 SECTION B-B ESM 08/30/17 SURVEYED: ESM 11/15/17 DESIGNED: ESM 01/03/18 PDG DRAWN: DCL CHECKED: BY I DATE I APPR I APPROVED SCALE: SCALE: 1"=20' HORIZ. 1"=5' VERT. VERTICAL: NAVD 1988 NM HORIZONTAL: NAD 1983/1991 ONE INCH DATU M AT FULL SCALE IF NOT ONE INCH SCALE ACCORDINGLY 250 245 240 235 Aamb6C TY OF Ap RENTON Planning/Building/Public Works Dept. IN COMPLIANCE WITH CITY OF RENTON STANDARDS EARLINGTON TOWNHOMES GRADING & T.E.S.C. DETAILS & NOTES UTILITY PERMIT # 01/03/18 FIELDBOOK: PAGE: DRAWING NO: GR-04 SHEET: 11 OF: 55 O O O U Q J LOS" O O O R-397111