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EROSION / SEDIMENTATION CONTROL NOTES
1. BEFORE ANY CONSTRUCTION OR DEVELOPMENT ACTIVITY OCCURS, A PRE - CONSTRUCTION
MEETING MUST BE HELD WITH THE CITY OF RENTON. PUBLIC WORKS DESIGN ENGINEER.
2 ALL LIMITS OF CLEARING AND AREAS OF VEGETATION PRESERVATION AS PRESCRIBED ON
THE PLAN(S) SHALL BE CLEARLY FLAGGED IN THE FIELD AND OBSERVED DURING
CONSTRUCTION.
3. ALL REQUIRED SEDIMENTATION /EROSION CONTROL FACILITIES MUST BE CONSTRUCTED
AND IN OPERATION PRIOR TO LAND CLEARING AND /OR CONSTRUCTION TO ENSURE THAT
SEDIMENT LADEN WATER DOES NOT ENTER THE NATURAL DRAINAGE SYSTEM. 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.
4. 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.
5. 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.
6. DURING THE TIME PERIOD OF OCTOBER 1ST THROUGH APRIL 30TH, ALL PROJECT
DISTRIBUTED SOIL AREAS GREATER THAN 5,000 SQUARE FEET, THAT ARE TO BE LEFT
UN- WORKED FOR MORE THAN 12 HOURS, SHALL BE COVERED BY MULCH, SODDING OR
PLASTIC COVERING.
7. IN ANY AREA WHICH HAS BEEN STRIPPED OF VEGETATION AND WHERE NO FURTHER
WORK IS ANTICIPATED FOR A PERIOD 30 DAYS OR MORE, ALL DISTURBED AREAS MUST
BE IMMEDIATELY STABILIZED WITH MULCHING, GRASS PLANTING OR OTHER APPROVED
EROSION CONTROL TREATMENT APPLICABLE TO THE TIME OF YEAR. GRASS SEEDING
ALONE WILL BE ACCEPTABLE ONLY DURING THE MONTHS OF APRIL THROUGH
SEPTEMBER, INCLUSIVE. SEEDING MAY PROCEED, HOWEVER, WHENEVER IT IS IN THE
INTEREST OF THE PERMITEE, BUT MUST BE AUGMENTED WITH MULCHING, NETTING OR
OTHER TREATMENT APPROVED BY THE CITY OF RENTON, OUTSIDE THE SPECIFIED TIME
PERIOD.
8. FOR ALL EROSION /SEDIMENTATION CONTROL PONDS WHERE THE DEAD STORAGE DEPTH
EXCEEDS 6 INCHES, A FENCE IS REQUIRED WITH A MINIMUM HEIGHT OF THREE (3)
FEET, 3:1 SIDE SLOPES.
9. A TEMPORARY GRAVEL CONSTRUCTION ENTRANCE, 24 FEET X 50 FEET X 6 INCHES OF
4 TO 6 INCH QUARRY SPALLS SHALL BE LOCATED AT ALL POINTS OF VEHICULAR
INGRESS AND EGRESS TO THE CONSTRUCTION SITE.
10. THE SOIL MOISTURE HOLDING CAPACITY OF ALL NEW PERVIOUS SURFACES THAT AT
PROJECT COMPLETION WILL NOT BE COVERED BY IMPERVIOUS SURFACE OR
INCORPORATED INTO A DRAINAGE FACILITY MUST BE PROTECTED. THE DUFF LAYER AND
NATIVE TOPSOIL SHALL BE RETAINED IN AN UNDISTURBED STATE TO MAXIMUM EXTENT
FEASIBLE.
11. ANY DUFF LAYER OR TOPSOIL REMOVED DURING GRADING SHALL BE STOCKPILED ONSITE
IN A DESIGNATED, CONTROLLED AREA NOT ADJACENT TO PUBUC RESOURCES AND
CRITICAL AREAS. THE MATERIAL SHALL BE REAPPLIED TO OTHER PORTION OF THE SITE
WHERE FEASIBLE.
12. THE SOIL IN ANY AREA THAT HAS BEEN COMPACTED OR THAT HAS HAD SOME OR ALL
OF THE DUFF LAYER OR UNDERLYING TOPSOIL REMOVED SHALL BE AMENDED TO
MITIGATE FOR LOSS OF MOISTURE- HOLDING CAPACITY. THE AMENDMENT SHALL TAKE
PLACE BETWEEN MAY 1 AND OCTOBER 1. REPLACED TOPSOIL SHALL BE A MINIMUM 8"
THICK. REPLACED TOPSOIL SHALL HAVE ORGANIC MATTER CONTENT BETWEEN 8% AND
13% DRY WEIGHT AND A pH SUITABLE FOR THE PROPOSED LANDSCAPE PLANTS.
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ESM JOB #1670- 004 -013
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).
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- COMPLb1NCE WITH THE ESC
PERFORMANCE CRITERIA IN SECTION D.4.1 (P. D -69). IF NON- COMPUAWCE 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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FIRST SUBMBTAL
I ESM
2/11/14 I
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SECOND SUBMITTAL
ESM
/15/14 I
2 " -3" THICK; 2 -3
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2
MYLAR SUBMITTAL
ESM
/12/14
AND COARSE MATERIAL
2 -3 TONS PER ACRE
GENERALLY REQUIRES GREATER THICKNESS THAN
Draw": Q
BLOWN STRAW. STRAW SHOULD BE CRIMPED TO
AVOID WIND BLOW. THE THICKNESS OF STRAW
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DATE
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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 TACKIRER
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.
CITY OF
RENTON
DATUM
Planning /Building /Public Works Dept.
R- 372907
CHECKED FOR,�//COMPUANCE TO CITY STANDARDS
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GRADING & T.E.S.C. DETAILS & NOTES
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