HomeMy WebLinkAboutTED4003776.4EROSION AND SEDIMENTATION CONTROL NOTES
S.C.E. NOTES: ���.�....�� ...�...�
1. SEE ADJACENT DETAIL.
2. A SEPARATION GEOTEXTILE SHALL BE PLACED UNDER THE SPALLS TO PREVENT FINE SEDIMENT FROM
PUMPING UP INTO THE ROCK PAD. THE GEOTEXTILE SHALL MEET THE FOLLOWING STANDARDS.
GRAB TENSILE STRENGTH (ASTM D-4751).....................200 PSI
GRAB TENSILE ELONGATION (ASTM D-4632)..................307 MAX.
MULLEN BURST STRENGTH (ASTM D-3786-80A)........... 400 PSI MIN.
AOS (ASTM D-4751)...................................... ..... ....... ...... 20-45 (U.S. STANDARD SIEVE SIZE)
J. HOG FUEL MAY BE SUBSTITUTED FOR OR COMBINED WITH QUARRY SPALLS IN AREAS THAT WILL NOT BE
USED FOR PERMANENT ROADS. THE EFFECTIVENESS OF HOG FUEL IS HIGHLY VARIABLE, BUT IT HAS BEEN
USED SUCCESSFULLY ON MANY SITES. IT GENERALLY REQUIRES MORE MAINTENANCE THAT QUARRY SPALLS.
THE INSPECTOR MAY AT ANY TIME REQUIRE THE USE OF QUARRY SPALLS IF THE HOG FUEL IS NOT
PREVENTING SEDIMENT FROM BEING TRACKED ONTO PAVEMENT OR IF THE HOG FUEL IS BEING CARRIED
ONTO PAVEMENT. HOG FUEL IS PROHIBITED FROM PERMANENT ROADBEDS BECAUSE ORGANICS IN THE
SUB -GRADE SOILS CAUSE DIFFICULTIES WITH COMPACTION.
4. FENCING SHALL BE INSTALLED AS NECESSARY TO RESTRICT TRAFFIC TO THE CONSTRUCTION ENTRANCE.
5. WHENEVER POSSIBLE, THE ENTRANCE SHALL BE CONSTRUCTED ON A FIRM, COMPACTED SUBGRADE. THIS
CAN SUBSTANTIALLY INCREASE THE EFFECTIVENESS OF THE PAD AND REDUCE THE NEED FOR MAINTENANCE.
STABILIZED CONSTR UCTION ENTRANCE
NOT TO SCALE
ROCK MUST COMPLETELY COVER THE
BOTTOM AND SIDES OF THE DITCH
6" MIN.
L = THE DISTANCE SUCH THAT POINTS
A AND B ARE OF EQUAL ELEVATION
4 ROCK CHECK DAM
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UTILITY CONFLICT NOTE.
CAUTION. -
THE CONTRACTOR SHALL BE RESPONSIBLE FOR VERIFYING THE LOCATION,
DIMENSION, AND DEPTH OF ALL EXISTING UTILITIES WHETHER SHOWN ON THESE
PLANS OR NOT, BY POTHOLING THE UTILITIES AND SURVEYING THE HORIZONTAL
AND VERTICAL LOCATION PRIOR TO CONSTRUCTION. THIS SHALL INCLUDE
CALLING UTILITY LOCATE ® 1-800-424-5555 POTHOLING ALL OF THE EXISTING
UTILITIES AT LOCATIONS OF NEW UTILITY CROSSINGS TO PHYSICALLY VERIFY
WHETHER OR NOT CONFLICTS EXIST LOCATIONS OF SAID UTILITIES AS SHOWN
ON THESE PLANS ARE BASED UPON THE UNVERIFIED PUBLIC INFORMATION AND
ARE SUBJECT TO VARIATION. IF CONFLICTS SHOULD OCCUR, THE CONTRACTOR
SHALL CONSULT WITH INSIGHT ENGINEERING COMPANY TO RESOLVE ALL
PROBLEMS PRIOR CONSULT TO PROCEEDING WITH CONSTRUCTION.
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24" MIN.
JOINTS IN FILTER FABRIC MATERIAL SHALL
BE SPLICED AT POSTS. USE STAPLES OR
WIRE RINGS OR EQUIVILENT TO ATTACH
FABRIC TO POSTS
PORTION OF THE NE 114 OF SECTION 6, TWP. 22 N., RGE. SE., W.M.
KING COUNTY, WASHINGTON
2 x2" BY 14 GAUGE WIRE OR EQUIVALENT,
IF STANDARD STRENGTH FABRIC USED
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6' MAXIMUM
MAY BE INCREASED TO 8' IF WIRE BACKING IS USED
2"x4" WOOD POSTS STEEL
FENCE POST, REBAR OR EQUIVALENT
FILTER FABRIC
2"x2" BY 14 GAUGE WIRE OR EQUIVALENT,
IF STANDARD STRENGTH FABRIC USED
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MINIMUM 4"x4" TRENCH -
SILT FENCE NOTES :
1. SEE ADJACENT DETAIL
2. THE GEOTEXTILE USED MUST MEET THE FOLLOWING SPECIFICATIONS:
AOS (ASTM D-4751) 30-100 SIEVE SIZE FOR SILT FILM
50-100 SIEVE SIZE FOR OTHER FABRICS
WATER PERMITTIVITY (ASTM D-4491) 0.02 SEC -1 MINIMUM
GRAB TENSILE STRENGTH (ASTM D-4632) 180 LBS MIN. FOR EXTRA STRENGTH FABRIC
100 LBS MIN. STANDARD STRENGTH FABRIC
GRAB TENSILE ELONGATION (ASTM D-4632) 30%% MAX.
ULTRAVIOLET RESISTANCE (ASTM D-4355) 70% MIN.
A COPY OF THE MANUFACTURERS' FABRIC SPECIFICATIONS MUST BE AVAILABLE ONSITE
3. STANDARD STRENGTH FABRIC REQUIRES WIRE BACKING TO INCREASE THE STRENGTH OF THE FENCE. WIRE
BACKING OR CLOSER POST SPACING MAY BE REQUIRED FOR EXTRA STRENGTH FABRIC IF FIELD
PERFORMANCE WARRANTS A STRONGER FENCE.
4. WHERE THE FENCE 1S INSTALLED, THE SLOPE SHALL BE NO STEEPER THAN 2H:1 V.
2 SILT FENCE DETAIL
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INSERT NOTES :
1. ANY ACCUMULATED SEDIMENT ON OR AROUND THE FILTER FABRIC PROTECTION SHALL BE
REMOVED IMMEDIATELY. SEDIMENT SHALL NOT BE REMOVED WITH WATER, AND ALL
SEDIMENT MUST BE DISPOSED OF AS FILL ON SITE OR HAULED OFF SITE.
2. ANY SEDIMENT IN THE CATCH BASIN INSERT SHALL BE REMOVED WHEN THE SEDIMENT
HAS FILLED ONE-THIRD OF THE AVAILABLE STORAGE.
3. THE FILTER MEDIA FOR THE INSERT SHALL BE CLEANED OR REPLACED AT LEAST
MONTHLY.
3 CATCH BASIN INSERT CROSS-SECTION
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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 ESC 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 (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 PLAN 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, 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 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.
13. COVER MEASURES WILL BE APPLIED IN CONFORMANCE WITH APPENDIX D OF THE 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 DDES INSPECTOR FOR REVIEW.
SEASONAL CLEARING AND GRADING NOTES:
APPLICABLE FROM OCTOBER 1 THROUGH APRIL 30.
1. THE ALLOWED TIME THAT A DISTURBED AREA CAN REMAIN UNWORKED WITHOUT COVER
MEASURES IS REDUCED TO TWO DAYS, RATHER THAN SEVEN.
2. STOCKPILES AND STEEP CUT AND FILL SLOPES ARE TO BE PROTECTED IF UNWORKED FOR
MORE THAN 12 HOURS.
J. COVER MATERIALS SUFFICIENT TO COVER ALL DISTURBED AREAS SHALL BE STOCKPILED ON
SITE.
4. ALL AREAS THAT ARE TO BE UNWORKED WITHIN THE WET SEASON SHALL BE SEEDED WITHIN
ONE WEEK OF THE BEGINNING OF THE WET SEASON, OCTOBER 1 TO MARCH 31.
5. MULCH IS REQUIRED TO PROTECT ALL SEEDED AREAS.
6. FIFTY LINEAR FEET OF SILT FENCE (AND THE NECESSARY STAKES) PER ACRE OF
DISTURBANCE MUST BE STOCKPILED ON SITE.
7. CONSTRUCTION ROAD AND PARKING LOT STABILIZATION ARE REQUIRED FOR ALL SITES UNLESS
THE SITE IS UNDERLAIN BY COARSE -GRAINED SOIL.
8. SEDIMENT RETENTION IS REQUIRED UNLESS NO OFF SITE DISCHARGE IS ANTICIPATED FOR THE
SPECIFIED DESIGN FLOW.
9. SURFACE WATER CONTROLS ARE REQUIRED UNLESS NO OFF SITE DISCHARGE IS ANTICIPATED
FOR THE SPECIFIED DESIGN FLOW.
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