HomeMy WebLinkAbout16ERASION ! 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, APRE-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/ESCSUPERVISOR 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
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NOT OCCUR FOR THE DURATION OF THE PROJECT.
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5.
ALL REQUIRED SEDIMENTATION/EROSION CONTROL FACILITIES MUST BE CONSTRUCTED AND IN OPERATION PRIOR TO LAND
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CLEARING AND/OR CONSTRUCTION TO PREVENT TRANSPORTATION OF SEDIMENT TO SURFACE WATER, DRAINAGE SYSTEMS
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AND ADJACENT PROPERTIES. ALL EROSION AND SEDIMENT FACILITIES SHALL BE MAINTAINED IN A SATISFACTORY CONDITION
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UNTIL SUCH TIME THAT CLEARING AND/OR CONSTRUCTION IS COMPLETE AND POTENTIAL FOR ON -SITE EROSION HAS
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PASSED. THE IMPLEMENTATION, MAINTENANCE, REPLACEMENT AND ADDITIONS TO EROSION/SEDIMENTATION CONTROL
SYSTEMS SHALL BE THE RESPONSIBILITY OF THE PERMITEE.
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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
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CONDITIONS DICTATE, THE PERMITEE SHALL ANTICIPATE THAT MORE EROSION AND SEDIMENTATION CONTROL FACILITIES
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Will BE NECESSARY TO ENSURE COMPLETE SALTATION CONTROL ON THE PROPOSED SITE. DURING THE COURSE OF
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CONSTRUCTION, IT SHALL BE THE OBLIGATION AND RESPONSIBILITY OF THE PERMITEE TO ADDRESS ANY NEW CONDITIONS
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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
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DRAINAGE SYSTEM.
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7.
0 CONTROL ONLY. IT DOES NOT CONSTITUTE AN APPROVAL OF
APPROVAL OF THIS PLAN IS FOR EROSION/SEDIMENT O.
STORM DRAINAGE DESIGN, SIZE NOR LOCATION OF PI RESTRICTORS, CHANNELS, OR RETENTION FACILITIES.
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8.
ANY AREAS OF EXPOSED SOILS, INCLUDING ROADWAY EMBANKMENTS, THAT WILL NOT BE DISTURBED FOR TWO DAYS
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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.).
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9.
WET SEASON SEASONAL EROSION AND SEDIMENT CONTROL REQUIREMENTS APPLY TO ALL CONSTRUCTION SITES CLEARING
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BETWEEN OCTOBER 1 AND MARCH 30 INCLUSIVE, UNLESS OTHERWISE APPROVED BY THE CITY THROUGH AN ADJUSTMENT
PROCESS.
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10.
COVER MEASURES WILL BE APPLIED IN CONFORMANCE WITH APPENDIX D OF THE SURFACE WATER DESIGN MANUAL
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11.
ANY AREA NEEDING ESC MEASURES, NOT REQUIRING IMMEDIATE ATTENTION, SHALL BE ADDRESSED WITHIN SEVEN (7)
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DAYS.
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12.
THE ESC FACILITIES ON INACTIVE SITES SHALL BE INSPECTED AND MAINTAINED A MINIMUM OF ONCE A MONTH OR
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WITHIN 24 HOURS FOLLOWING A STORM EVENT.
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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 GRADEDSO
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. f), 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.
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.
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Civil Engineering
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WET SEASON PROVISIONS
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).
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 C11Y 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.
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) 290-4439.
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.
0 1 FIRST SUBMITTAL
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a NO.
REVISION
ESM 04/01/16 SURVEYED:
DESIGNED:
DRAWN: DCL
CHECKED:
BY DATE APPR I APPROVED:
Scmz-
,� IAL:- W ,� ", C I TY OF
Ali RENTON
I ONE INM AT FULL SCAM DATUM Planning/Building/Public Works Dept.
IF NOT ONE INCH
SCALE ACCORDINGLY
CHECKED FOR COMPLIANCE TO CITY STANDARDS
DATE:
KI KADE CROSSING 04/01/2016
GRADING & T.E.S.C. DETAILS & NU T% Flemom.
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APR 0 4 2016 DRAWING NO:
GR-02
i R CITY OF RENT EEC: OF
UTILITY TY PERMIT I �T # PLANNING IN FO7 19