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kEROSION AND SEDIMENT CONTROL (ESC) STANDARD PLAN NOTES PER COR STD 268.00:
11. BEFORE ANY CONSTRUCTION OR DEVELOPMENT ACTIVITY OCCURS, A PRE -CONSTRUCTION MEETING SHALL BE
HELD AMONG THE CITY OF RENTON, HEREBY REFERRED TO AS CITY, AND THE APPLICANT'S CONTRACTOR.
2. THE CONTRACTOR IS RESPONSIBLE FOR OBTAINING THE WASHINGTON STATE DEPARTMENT OF ECOLOGY
(ECOLOGY) CONSTRUCTION STORMWATER GENERAL PERMIT, IF IT IS REQUIRED FOR THE PROJECT. THE
APPLICANT SHALL PROVIDE THE CITY COPIES OF ALL MONITORING REPORTS PROVIDED TO ECOLOGY ASSOCIATED
WITH THE CONSTRUCTION STORMWATER GENERAL PERMIT.
3. THE ESC PLAN SHALL INCLUDE AN ESC CONSTRUCTION SEQUENCE DETAILING THE ORDERED STEPS THAT SHALL
BE FOLLOWED FROM CONSTRUCTION COMMENCEMENT TO POST -PROJECT CLEANUP IN ORDER TO FULFILL
PROJECT ESC REQUIREMENTS.
4. THE BOUNDARIES OF THE CLEARING LIMITS, SENSITIVE AREAS AND THEIR BUFFERS, AND AREAS OF VEGETATION
PRESERVATION AND TREE RETENTION AS PRESCRIBED ON THE PLAN(S) SHALL BE CLEARLY DELINEATED BY
FENCING AND PROTECTED IN THE FIELD IN ACCORDANCE WITH APPENDIX D OF THE CITY OF RENTON SURFACE
WATER DESIGN MANUAL (RENTON SWDM) PRIOR TO THE START OF CONSTRUCTION. 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.
5. 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 PAD, 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. IF SEDIMENT IS TRACKED
OFFSITE, PUBLIC ROADS SHALL BE CLEANED THOROUGHLY AT THE END OF EACH DAY, OR MORE FREQUENTLY
DURING WET WEATHER, AS NECESSARY TO PREVENT SEDIMENT FROM ENTERING WATERS OF THE STATE.
6. WASHOUT FROM CONCRETE TRUCKS SHALL BE PERFORMED OFF -SITE OR IN DESIGNATED CONCRETE WASHOUT
AREAS ONLY. DO NOT WASH OUT CONCRETE TRUCKS ONTO THE GROUND, OR TO STORM DRAINS OR OPEN
DITCHES. ON -SITE DUMPING OF EXCESS CONCRETE SHALL ONLY OCCUR IN DESIGNATED CONCRETE WASHOUT
AREAS.
7. ALL REQUIRED ESC BMPS SHALL 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 ESC BMPS 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. ALL
ESC BMPS SHALL BE REMOVED AFTER CONSTRUCTION IS COMPLETED AND THE SITE HAS BEEN STABILIZED TO
ENSURE POTENTIAL FOR ON -SITE EROSION DOES NOT EXIST. THE IMPLEMENTATION, MAINTENANCE,
REPLACEMENT, ENHANCEMENT, AND REMOVAL OF ESC BMPS SHALL BE THE RESPONSIBILITY OF THE APPLICANT
18. ANY HAZARDOUS MATERIALS OR LIQUID PRODUCTS THAT HAVE THE POTENTIAL TO POLLUTE RUNOFF SHALL BE
DISPOSED OF PROPERLY.
9. THE ESC BMPS 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 APPLICANT SHALL ANTICIPATE THAT MORE ESC BMPS 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 APPLICANT TO ADDRESS ANY NEW CONDITIONS THAT MAY BE CREATED
BY THE ACTIVITIES AND TO PROVIDE ADDITIONAL ESC BMPS, OVER AND ABOVE MINIMUM REQUIREMENTS, AS MAY
BE NEEDED, TO PROTECT ADJACENT PROPERTIES AND WATER QUALITY OF THE RECEIVING DRAINAGE SYSTEM.
110. APPROVAL OF THIS PLAN IS FOR ESC ONLY. IT DOES NOT CONSTITUTE AN APPROVAL OF STORM DRAINAGE DESIGN,
SIZE NOR LOCATION OF PIPES, RESTRICTORS, CHANNELS, OR STORMWATER FACILITIES.
111. ANY DEWATERING SYSTEM NECESSARY FOR THE CONSTRUCTION OF STORMWATER FACILITIES SHALL BE
SUBMITTED TO THE CITY FOR REVIEW AND APPROVAL.
12. ANY AREAS OF EXPOSED SOILS, INCLUDING ROADWAY EMBANKMENTS, THAT WILL NOT BE DISTURBED FOR TWO
DAYS DURING THE WET SEASON (OCTOBER 1 ST THROUGH APRIL 30TH) OR SEVEN DAYS DURING THE DRY SEASON
(MAY 1 ST THROUGH SEPTEMBER 30TH) SHALL BE IMMEDIATELY STABILIZED WITH THE APPROVED ESC COVER
METHODS (E.G., SEEDING, MULCHING, PLASTIC COVERING, ETC.) IN CONFORMANCE WITH APPENDIX D OF THE
RENTON SWDM.
113. WET SEASON ESC REQUIREMENTS APPLY TO ALL CONSTRUCTION SITES BETWEEN OCTOBER 1ST AND APRIL 30TH,
UNLESS OTHERWISE APPROVED BY THE CITY.
114. ANY AREA NEEDING ADDITIONAL ESC MEASURES, NOT REQUIRING IMMEDIATE ATTENTION, SHALL BE ADDRESSED
WITHIN SEVEN (7) DAYS.
15. THE ESC BMPS ON INACTIVE SITES SHALL BE INSPECTED AND MAINTAINED AT A MINIMUM OF ONCE A MONTH OR
WITHIN 24 HOURS FOLLOWING A STORM EVENT. INSPECTION AND MAINTENANCE SHALL OCCUR MORE FREQUENTLY
AS REQUIRED BY THE CITY.
16. BEFORE COMMENCEMENT OF ANY CONSTRUCTION ACTIVITY, CATCH BASIN INSERTS PER THE CITY STANDARD
PLAN 216.30 SHALL BE PROVIDED FOR ALL STORM DRAIN INLETS DOWNSLOPE AND WITHIN 500 FEET OF A
DISTURBED OR CONSTRUCTION AREA, UNLESS THE RUNOFF THAT ENTERS THE INLET WILL BE CONVEYED TO A
SEDIMENT POND OR TRAP. ALL CATCH BASIN INSERTS SHALL BE PERIODICALLY INSPECTED AND REPLACED AS
NECESSARY TO ENSURE FULLY FUNCTIONING CONDITION.
17. AT NO TIME SHALL SEDIMENT ACCUMULATION EXCEED 2/3 OF THE CAPACITY OF THE CATCH BASIN SUMP. 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.
DESIGNED BY:
S. SRIDHARAN
DRAWN BY:
H. ONG
CHECKED BY:
1 06/13/2025 SS RP SS ADDENDUM #1 R. PARISH
0 12/10/2024 SS RP SS ISSUED FOR BID APPROVED BY:
No. I DATE IDSN ICHK IAPP IREVISION IS. SRIDHARAN
18. ANY PERMANENT STORMWATER FACILITY LOCATION USED AS A TEMPORARY SETTLING BASIN SHALL BE MODIFIED
WITH THE NECESSARY ESC BMPS AND SHALL PROVIDE ADEQUATE STORAGE CAPACITY. IF THE TEMPORARY
FACILITY IS TO ULTIMATELY FUNCTION AS AN INFILTRATION SYSTEM IN ITS PERMANENT STATE, THE TEMPORARY
FACILITY SHALL BE ROUGH GRADED SO THAT THE BOTTOM AND SIDES ARE AT LEAST THREE FEET ABOVE THE
FINAL GRADE OF THE PERMANENT FACILITY.
19. AREAS DESIGNATED ON THE PLAN(S) CONTAINING EXISTING STORMWATER FACILITIES OR ON -SITE BMPS
(AMENDED SOILS, BIORETENTION, PERMEABLE PAVEMENT, ETC.) SHALL BE CLEARLY FENCED AND PROTECTED
SING BMPS TO AVOID SEDIMENTATION AND COMPACTION DURING CONSTRUCTION.
20. PRIOR TO THE BEGINNING OF THE WET SEASON (OCTOBER 1ST), ALL DISTURBED AREAS SHALL BE INSPECTED TO
IDENTIFY WHICH ONES SHALL BE SODDED OR SEEDED IN PREPARATION FOR THE WINTER RAINS. DISTURBED
AREAS SHALL BE SODDED OR SEEDED WITHIN ONE WEEK OF THE BEGINNING OF THE WET SEASON. AN EXHIBIT OF
THOSE AREAS TO BE SODDED OR SEEDED AND THOSE AREAS TO REMAIN UNCOVERED SHALL BE SUBMITTED TO
THE CITY FOR REVIEW.
21. PRIOR TO FINAL CONSTRUCTION ACCEPTANCE, THE PROJECT SITE SHALL BE STABILIZED TO PREVENT
SEDIMENT -LADEN WATER FROM LEAVING THE PROJECT SITE, ALL ESC BMPS SHALL BE REMOVED, AND
STORMWATER CONVEYANCE SYSTEMS, FACILITIES, AND ON -SITE BMPS SHALL BE RESTORED TO THEIR FULLY
FUNCTIONING CONDITION. ALL DISTURBED AREAS OF THE PROJECT SITE SHALL BE VEGETATED OR OTHERWISE
PERMANENTLY STABILIZED. AT A MINIMUM, DISTURBED AREAS SHALL BE SODDED OR SEEDED AND MULCHED TO
ENSURE THAT SUFFICIENT COVER WILL DEVELOP SHORTLY AFTER FINAL APPROVAL. MULCH WITHOUT SEEDING IS
ADEQUATE FOR AREAS TO BE LANDSCAPED BEFORE OCTOBER 1ST.
22. THE CONTRACTOR SHALL EMPLOY DUST CONTROL MEASURES AS NEEDED TO PREVENT SURFACE AND AIR
MOVEMENT OF DUST FROM EXPOSED SOIL SURFACES.
23. SOIL STOCKPILES SHALL BE STABILIZED FROM EROSION, PROTECTED WITH SEDIMENT TRAPPING MEASURES, AND
WHERE POSSIBLE, LOCATED AWAY FROM STORM DRAIN INLETS.
24. THE CONTRACTOR SHALL MAINTAIN A SWPPP DOCUMENT ON -SITE AND KEEP IT UPDATED AS CONSTRUCTION
PROGRESSES.
SEQUENCE OF CONSTRUCTION
THE TYPICAL CONSTRUCTION SEQUENCE SHALL BE AS FOLLOWS:
A. CONDUCT PRE -CONSTRUCTION MEETING.
B. POST SIGN WITH NAME AND PHONE NUMBER OF TESC SUPERVISOR.
C. INSTALL PERIMETER PROTECTION (SILT FENCE, ETC.)
D. INSTALL CATCH BASIN INLET PROTECTION.
E. CLEAR AND GRUB THE SITE.
F. MAINTAIN EROSION CONTROL MEASURES IN ACCORDANCE WITH PLANS AND MANUFACTURER'S
RECOMMENDATIONS.
G. INSTALL NEW STORM DRAIN.
H. EXCAVATE COMPOST AMENDED BIOSWALE.
I. INSTALL COMPOST AMENDED SOIL
J. INSTALL COMPOST BLANKET.
K. RESTORE ROADWAY AND SIDEWALKS.
L. INSTALL IRRIGATION SYSTEM.
M. INSTALL PLANTS
K. RELOCATE EROSION CONTROL MEASURES OR INSTALL NEW MEASURES SO THAT AS SITE CONDITIONS CHANGE,
THE EROSION AND SEDIMENT CONTROL IS ALWAYS IN ACCORDANCE WITH THE CITY ECOLOGY TESC MINIMUM
REQUIREMENTS.
L. STABILIZE ALL AREAS THAT REACH FINAL GRADE WITHIN 7 DAYS.
M. SEED, SOD AND STABILIZE ANY AREAS TO REMAIN UNWORKED FOR MORE THAN 30 DAYS.
N. UPON COMPLETION OF THE PROJECT, ALL DISTURBED AREAS MUST BE STABILIZED AND BEST MANAGEMENT
PRACTICES BE APPLIED TO REMOVAL OF CONTROLS IF APPROPRIATE.
CONSTRUCTION STORMWATER VOLUMES AND FLOW
RATES
TEMPORARY
APPROXIMATE
DESIGN STORM
PEAK
APPROXIMATE
STORMWATER
CONTRIBUTING
FLOW
VOLUME (CF)
FACILITY LOCATION
AREA (SF)
RATE (CFS)
TDA SRTC 1 -WEST
7,451
2 YEAR, 24 HR
2 933
21,386
10 YEAR, 24 HR
4.34
31,646
HOLDING TANKS
TDA SRTC 1 - EAST
2 YEAR, 24 HR
1.906
13,898
4,841
10 YEAR, 24 HR
2.819
20,555
HOLDING TANKS
SUBMITTED BY:
6-9-2025 R. PARGAS
1
CITY OF RENTON EROSION CONTROL WET SEASON REQUIREMENTS
ANY SITE WITH EXPOSED SOILS DURING THE WET SEASON (OCTOBER 1 TO APRIL 30) SHALL BE SUBJECT TO THE
PROVISIONS BELOW. IN ADDITION TO THE ESC COVER MEASURES (SEE SECTION D2.1.2). THESE PROVISIONS INCLUDE
COVERING ANY NEWLY SEEDED AREAS WITH MULCH AND IDENTIFYING AND SEEDING AS MUCH DISTURBED AREA AS
POSSIBLE PRIOR TO SEPTEMBER 23 IN ORDER TO PROVIDE GRASS COVER FOR THE WET SEASON. A "WET SEASON ES
PLAN" MUST BE SUBMITTED AND APPROVED BY THE CITY BEFORE WORK PROCEEDS OR CONTINUES.
THE FOLLOWING PROVISIONS FOR WET SEASON CONSTRUCTION ARE DETAILED IN APPENDIX D OF THE 2022 CITY OF
RENTON SURFACE WATER DESIGN MANUAL. PLEASE ENSURE THE SITE IS PROTECTED AND COMPLIES WITH THE
SPECIAL PROVISIONS OUTLINED BELOW.
WET SEASON SPECIAL PROVISIONS
1. THE ALLOWED TIME THAT A DISTURBED AREA MAY REMAIN UNWORKED WITHOUT COVER MEASURES IS TWO
CONSECUTIVE WORKING DAYS, (SECTION D.2.1.2).
2. STOCKPILES AND STEEP CUT AND FILL SLOPES ARE TO BE PROTECTED IF UNWORKED MORE THAN 12 HOURS
(SECTION D.2.1.2).
3. COVER MATERIALS SUFFICIENT TO COVER ALL DISTURBED AREAS SHALL BE STOCKPILED ON SITE (SECTION
D.2.1.2).
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.2.1.2.6).
5. MULCH IS REQUIRED TO PROTECT ALL SEEDED AREAS (SECTION D.2.1.2.2)
6. FIFTY LINEAR FEET OF SILT FENCE (AND THE NECESSARY STAKES) PER ACRE OF DISTURBANCE MUST BE
STOCKPILED ON SITE (SECTION D.2.1.2.6).
7. CONSTRUCTION ROAD AND PARKING LOT STABILIZATION ARE REQUIRED FOR ALL SITES UNLESS THE SITE IS
UNDERLAIN BY COARSE -GRAINED SOIL (SECTION D.2.1.4.2).
8. SEDIMENT RETENTION IS REQUIRED UNLESS NO OFFSITE DISCHARGE IS ANTICIPATED FOR THE SPECIFIED DESIG
FLOW (SECTION D.2.1.5).
9. SURFACE WATER CONTROLS ARE REQUIRED UNLESS NO OFFSITE DISCHARGE IS ANTICIPATED FOR THE SPECIFIE
DESIGN FLOW (SECTION D.2.1.6).
10. PHASING AND MORE CONSERVATIVE BMPS MUST BE EVALUATED FOR CONSTRUCTION ACTIVITY NEAR (SECTION
D.2.4.3).
11. ANY RUNOFF GENERATED BY DE -WATERING MAY BE REQUIRED TO DISCHARGE TO THE SANITARY SEWER (WITH
APPROPRIATE DISCHARGE AUTHORIZATION), PORTABLE SAND FILTER SYSTEMS, OR HOLDING TANKS (SECTION
D.2.2).
TESC CONSTRUCTION SEQUENCE
1. SCHEDULE MAJOR LAND DISTURBING ACTIVITIES DURING THE DRY MONTHS AND ALLOW TIME BEFORE THE WET
SEASON BEGINS ADEQUATELY STABILIZE THE DISTURBED GROUND. CONTRACTOR SHALL MONITOR, REPLACE, AN[
SUPPLEMENT TESC MEASURES WITH ADDITIONAL MEASURES DURING WET SEASON TO MITIGATE FOR ANY
POTENTIAL FOR EROSION OR SEDIMENT ON -SITE TO OCCUR AND IMPACT THE RIGHT-OF-WAY OR NEIGHBORING
PROPERTIES (I.E. DOUBLE SPLIT FENCE, REPLACE CB INSERTS MORE OFTEN, ETC. CONTRACTOR SHALL UPDATE
AND INCLUDE ADDITIONAL MEASURES BEING IMPLEMENTED DURING THE WET SEASON IN THE CSWPPP THAT WILL
BE ON SITE IN THE CONSTRUCTION TRAILER.
2. PHASE AND/OR SCHEDULE CONSTRUCTION TO LIMIT THE AMOUNT OF DISTURBED, UNSTABILIZED SOIL EXPOSED A
ANY ONE TIME. CONTRACTOR SHALL PROVIDE PHASING AND CONSTRUCTION SCHEDULE TO THE CITY PROJECT
MANAGER AND INSPECTOR PRIOR TO STARTING CONSTRUCTION.
3. FENCE OR FLAG AREAS TO BE PROTECTED OF LEFT UNDISTURBED DURING CONSTRUCTION, INCLUDING
INSTALLATION OF TEMPORARY CONSTRUCTION FENCING AND TREE PROTECTION MEASURES.
4. STRIP AND CLEAR AND GRUB FIELD SUFFICIENTLY FOR INSTALLATION OF TEMPORARY EROSION SEDIMENTATION
CONTROL (ESC) BMPS.
5. PROVIDE TEMPORARY PEDESTRIAN DETOUR ROUTES, SIGNS, FENCING, ETC. BOTH ONSITE AND IN THE PUBLIC
RIGHT-OF-WAY.
6. TEMPORARILY STABILIZE SITE, THROUGH RE -VEGETATION, HYDROSEED, MULCHING OR OTHER APPROPRIATE
BMP'S AS A RESULT OF SITE GRADING IN AREAS THAT WILL NOT RECEIVE HARDSCAPE.
7. CONSTRUCT STORM UTILITIES, CONCRETE, ASPHALT, FENCING AND STRUCTURES/ OTHER IMPROVEMENTS PER
THE CONSTRUCTION DOCUMENTS
8. PLACE FILL SECTION AND LAWN/SEED/LANDSCAPING/MULCH.
9. REMOVE TEMPORARY ESC FACLITIES UPON COMPLETION OF CONSTRUCTION AND ONLY ONCE SITE IS STABILIZED,
INSPECTED, AND APPROVED BY CITY OF RENTON INSPECTOR.
SCALE:
J NTS
- Q FILENAME:
4.5r)?IDE !�2 U
0
w S 1-BT 120-CTN 101
BRT General Engineering Consultant J " SOUNDTRANSIT CONTRACT No.:
RTA/CN 0205-24
DATE: REVIEWED BY: DATE: DATE:
12/10/2024 J. ALTCHECH 12/10/2024 12/10/2024
DEVELOPMENT ENGINEERING
R-433261
msippo 11/25/2025
STRIDE BUS RAPID TRANSIT DRAWING No.:
SOUTH RENTON TRANSIT CENTER BT120-CTN101
BT105 FACILITY ID:
CIVIL BT120
SHEET No.: REV:
STANDARD TESC NOTES
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