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CONSTRUCTION NOTES:
(D CONTRACTOR TO INSTALL TEMPORARY CREEK 13YPASS SYSTEM, BYPASS
SYSTEM SHOWN ON THIS DRAWING IS SCHEMATIC AND CONTRACTOR SHALL
SUBMIT 13YPASS PLAN IN ACCORDANCE WITH THE SPECIFICATIONS FOR
APPROVAL BY THE CITY. LOCATE PIPE AND COFFER DAMS TO ALLOW FOR
CONSTRUCTION OF OTHER ;MPROVEMENTS INCLUDING HEADWALL, BOULDER
CASCADE AND CULVERT BAFFLES. UPON COMPLETION OF PROJECT, ALL
MATERIAL USED FOR THE TEMPORARY BYPASS SHALL BE REMOVED FROM
THE SITE AND THE SITE RESTORED TO PRE-PROJECT CONDITIONS.
AT A MINIMUM CREEK BYPASS SHALL BE W/24" DIAMETER BUTT-FUSED
HOPE PIPE. THE SECTION UPSTREAM AND OUTSIDE OF THE EXISTING
CULVERT SHALL BE 36" OtA AT MIN. 2% SLOPE AND SHALL RAVE A
MITERED INLET. 36' PIPE SHALL TRANSITION TO 240 DIA USING SPECIALLY
MADE FUTING THAT MATCHES INVERTS. 240 PIPE SHALL BE SUPPORTED
WITHIN EXISTING CULVERT USING CONTRACTOR-DESIGNEO SYSTEM. BYPASS
PIPE SHALL EXTEND FAR ENOUGH OOWNSTRF)M TO ELIMINATE NEED FOR
A DOWNSTREAM COFFER DAM AND SHALL EXTEND FAR ENOUGH THAT
OUTLET ELEVATION IS A MINIMUM OF 2 VERTHA FEET BELOW WORK AREA.
ELEVATION OF INLEF SRALL BE 152.5 FT.
PROVIDE SAND OR GRAVEL-FILLEO BAG COFFI]i DAM SYSTEM TO
ELEVATION 156.5 FT ON UPSTREAM SIDE OF CULVERT, COFFER DAM
SYSTEM TO BE CONTRACTOR-DESIGNED TO WITHSTAND ANTICIPATED
HYDROSTATIC FORCES AND WITHSTAND OVERTOPPING. ALSO SEE GENERAL
NOTE 1.
CONNECT 12' TEMPORARY STORM DRAIN TO EXISTING 12" CMP AND
DIRECT FLOW TO UPSTREAM SIDE OF COFFER OAM.
INSTALL CATCH BASIN INSERTS (4) AT FIRST CB WEST AND EAST OF
CULVERT. SEE DETAIL I ON DWG C3.
EXCAVATE SUMP AT LOW POINT WHERE FLOMi EXIT EXISTING CULVERT.
LINE SUMP WITH PLASTIC. DIRECT ANY CONTAMINATED CONSTRUCTION
WATER/SEEPAGE (E.G., AFTER SAND BLASTING OPERATIONS OR CONCRErE
WORK) DISCHARGING FROM CULVERT TO SUMP AND PUMP TO HOLDING
TANK FOR HAUL TO DISPOSAL SITE UPON REMOVAL OF EXISTING DAMAGED
CULVERT SECTION, RELOCATE LINED SUMP TO CAPTURE CULVERT SEEPAGE
AT NEW OUTUET LOCATION.
INSTALL TEMPORARY SILT FENCE ACROSS CREEK BOTTOM AND AT TOP OF
CHANNEL BANKS ALONG CREEK, SEE DETAIL :2 ON DWG C2. AS
CONSTRUCTION PROCEEDS, RELOCATE SILT FENCE WHEN NECESSARY AND
AS DIRECTED 13Y ENGINEER.
INSTALL SUMP AND PUMP SYSTEM TO COLLECT ANY LEAKAGE FROM
COFFERDAM AND PUMP TO UPSTREAM SIDE OF COFFERDAM. SUMP TO BE
M NIMUM OF 3 FT DEEP, WITH PERF PIPE AND BACKnLLEo WITH WASHED
ROCK.
CONTRACTOR MAY USE EXISTING PAVED AREAS WITHIN EASEMENT FOR
ACCESS AND STAGING. ANY ADDITIONAL STAGING AREA NEEDED SHALL BE
CONTRACTOR OBTAINED.
100 CLEARING LIMITS TO CULVERT INLET IS FOR TEMPORARY ACCESS AND
INSTALLATION OF TESC FEATURES. NOTE AN ENSTING CMP HALF-PIPE IN
THIS AREA WILL NEED TO BE RESTORED IF DISTURBED.
A LARGE CLEARING LIMITS AREA IS PROVIDED IN THIS AREA TO PROVIDE
CONTRACTOR Fl EXIBILITY IN SELECTING MAIN POINT OF ACCESS TO WORK
AREA. ONCE MAIN POINT OF ACCESS IS SELECTED, CONTRACTOR TO
REDUCE CLEARING LIMITS TO EXTENT PIRACTICAL
GENERAL NOTES:
1. BYPASS SYSTEM IS SIZED TO PASS MODERATE TO HEAVY FALL STORMS WED
ON 2 YEARS OF GAGED FLOW. CONTRACTOR SHALL MAINTAIN SUFFICIENT
i I MATERIALS ON SITE TO RAISE HEIGHT OF COFFER OAM 1.5 FT IN CASE OF
LARGE STORM EVENT.
PACE AS SHOWN
AS
0 100% SUBMITTAL — SL DATL
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NO. REVISION APPIR
TESC NOTES:
1. TIHE IMPLEMENTATION OF THESE ESC PLANS AND THE CONSTRUCTION, MAINTENANCE. REPLACEMENT,
AND UPGRADiNG OF THESE ESC FACILITIES IS THE RESPONSIBILITY OF THE CONTRACTOR UNTIL ALL
CONSTRUCTION IS APPROVED.
2. THE BOUNDARIES OF THE CONSTRUCTION LIMITS SHOWN ON THIS PLAN S14ALL BE CLEARLY
FLAGGED BY THE CONTRACTOR USING YELLOW CONSTRUCTION TAPE WITH 20W WOODEN STAKES
SPACED AT 20' MAXIMUM PRIOR TO CONSTRUCTION. ELECTRONIC FILES WILL BE PROVIDED TO THE
CONTRACTOR FOR LOCATION OF THE LIMITS. DURING THE CONSTRUCTION PERIOD, NO DISTURBANCE
BEYOND THE CONSTRUCTION UMITS SHALL BE PERMITTED. THE CONSTRUCTION LIMITS SHALL BE
MAINTANED BY THE CONTRACTOR FOR THE DURATION OF CONSTRUCTION. LARGE WOODY DEBRIS
MAY BE PLACED OUTSIDE THE CONSTRUCTION LIMITS.
3. 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-
4. 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 CONSTRUCTION SEQUENCING AND UNEXPECTED STORM EVENTS AND SHALL BE
MODIFIED TO ACCOUNT FOR CHANGING SITE CONDITIONS (E.G., ADDITIONAL SUMP PUMPS,
RELOCATION OF DITCHES AND SILT FENCES, ErC.).
5. THE ESC FACILITIES SHALL BE INSPECTED DAILY BY THE CONTRACTOR AND MAINTAINED TO ENSURE
CONTINUED PROPER FUNCTIONING. WRITTEN RECORDS SHALL BE KEPT OF WEEKLY REVIEWS OF THE
ESC FACILITIES. DAMAGED OR IMPROPERLY FUNCTIONING EIMPS SHALL BE REPLACED AT NO
ADDITIONAL COST TO THE CITY.
6. ANY AREAS OF D(POSED SOILS THAT WILL NOT BE DISTURBED FOR TWO DAYS SHALL BE
IMMEDIATELY STABILIZED WITH THE APPROVED ESC METHODS (E.G., SEED'NG, MULCHNG, PLASTIC
COVERING, ETC.).
7. AT NO TIME SHALL MORE THAN ONE (1) FOOT OF SEDIMENT BE ALLOWED TO ACCUMULATE WITHN
A CATCH BASIN. THE CLEANING OPERATION SHALL NOT FLUSH SEDIMENT-LAOEN WATER INTO THE
DOWNSTREAM SYSTEM.
B. WHERE STRAW MULCH FOR TEMPORARY EROSION CONTROL 15 REQUIRED, IT SHALL BE APPLIED AT
A MINIMUM THICKNESS OF 2 TO 3 INCHES.
9. USE REINFORCED PLASTIC FABRIC TO COVER STOCKPILED ITEMS WHEN NOT IN USE. THE
REINFORCED PLASTIC FABRIC SHALL BE HELD DOWN BY A MINIMUM OF 10LB SANDBAGS PLACED
EVERY 1D FEEr ALONG THE EDGE AND ACROSS THE PILE.
10. IN ACCORDANCE WITH THE DEPARTMENT OF ECOLOGY REQUIREMENTS, WASTEWATER FROM CEMENT
CONCRETE, MASONRY, ASPHALT CONCRETE CUTTING OR POURING OPERATIONS, PETROLEUM
PRODUCTS, HYDRAULIC FLUID, SEOIMENT-LADEN WATER, CHEMICALS, OR ANY OTHER TOXIC OR
DELETERIOUS MATERIAL SHALL NOT BE ALLOWED TO ENTER OR SEP INTO STORM DRAANAGE
SYSTEMS OR SURFACE WATERS. ANY WASTAGE OR WATER COMING IN CONTACT WITH FRESH
CONCRETE SHALL BE COLLECTED IN AN IMPERVIOUS SUMP FOR COMPLIETE REMOVAL AND DISPOSAL
TO PREVENT CONTAMINANTS FROM ENTERING GROUND OR SURFACE WATERS.
11. CONTRACTOR SHALL COMPLY WITH ALL APPROVED LOCAL STATE AND FEDERAI - REQUIREMENTS FOR
PROTECTION OF WATER QUALITY. SEE PROJECT SPECIFICATIONS FOR COPIES OF PROJECT PERMITS.
A COPY OF THE APPROVED HYDRAULIC PROJECT APPROVAL (HPA) SHALL BE KEPT IN A VISIBLE
LOCATION. ALL WORK BELOW THE ORDINARY HIGH WATER LINE (OHWL) SHALL BE BEWEN JUNE
15, 2008 AND OCTOBER 15, 2008.
12. CONTRACTOR SHALL CAPTURE AND SAFELY REMOVE AND RELOCATE FISH WITHIN THE TEMPORARY
DIVERSION AREA IN ACCORDANCE WITH THE HPA REQUIREMENTS. PRIOR TO INSTALLING TEMPORARY
BYPASS, CONTRACTOR SHALL OBTAIN A WASHINGTON DEPARTMENT OF FISH AND WILDLIFE (WDFW)
SCIENTIFIC COLLECTING PERMIT PER SPEC SECTION 1-07.6 AND INSTALL FISH BLOCK NETS AND
HAND NET FISH FROM WORK AREA PER PERMIT REQUIREMENTS. CONTRACTOR SHALL HAVE A
QUALIAEO BIOLOGIST CAPTURE AND SAFELY MOVE FOOD FISH, GAME FISH, AND OTHER FISH LIFE
FROM THE JOB SITE. CONTRACTOR SHALL HAVE FISH CAPTURE AND TRANSPORTATION EQUIPMENT
READY AND ON THE JOB SITE. CAPTURED FISH SHALL BE IMMEDIATELY AND SAFELY TRANSFERRED
TO FREE-FLOWING WATER DOWNSTREAM OF THE PROJECT SITE.
CITY OF
RENTON
Planning/Building/Public Works Dapt.
20 0 20 40
1"=20'-V I — — -
Scale Feet
CARR ROAD - PANTHER CREEK
EMERGENCY CULVERT REPAIR PROJECT
TEMPORARY EROSION AND SEDIMENT CONTROL C 1
3 '8