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<br />SWPPP TEMPORARY EROSION CONTROL NOTES
<br />1. NON-COMPLIANCE WITH THE EROSION CONTROL REQUIREMENTS WATER QUALITY REQUIREMENTS AND CLEARING LIMITS
<br />VIOLATIONS MAY RESULT IN A TEMPORARY STOP -WORK ORDER UNTIL SAID EROSION CONTROL MEASURES ARE FUNCTIONAL.
<br />2. CLEARING LIMITS SHALL BE ESTABLISHED FIRST THEN EROSION CONTROL BEST MANAGEMENT PRACTICES BMPS SHALL BE
<br />INSTALLED PRIOR TO ANY SITE DISTURBANCE. THE EROSION/SEDIMENTATION CONTROL FACILITIES SHALL CONSTRUCTED
<br />PRIOR TO ANY GRADING EXTENSIVE LAND CLEARING IN ACCORDANCE WITH THE APPROVED CONSTRUCTION STORM
<br />WATER POLLUTION PREVENTION
<br />TION PLAN (SWPPP). THESE FACILITIES MUST BE SATISFACTORILY MAINTAINED UNTIL
<br />CONSTRUCTION AND LANDSCAPING IS COMPLETED, THE PERMANENT VEGETATIVE COVER IS ESTABLISHED AND THE
<br />POTENTIAL FOR ON -SITE EROSION HAS PASSED.
<br />3. PUBLIC STREETS ARE TO BE KEPT CLEAR OF DIRT AND DEBRIS DURING CONSTRUCTION EXCAVATION AND FILL OPERATIONS.
<br />MATERIAL SHALL BE REMOVED FROM THE STREETS BY SWEEPING. PAVED SURFACES MUST BE CLEANED AT THE END OF
<br />EACH DAY.
<br />4. SEDIMENT CONTROL FACILITIES SHOWN ON THESE PLANS SHALL BE INSTALLED AS PART OF THE PLAN TO REMOVE SEDIMENT
<br />FROM THE WATER BEFORE CLEARING AND GRADING IS ALLOWED. THIS MAY INCLUDE SILT FENCES, SWALES, CHANNELS,
<br />BERMS, BARRIERS AND OTHER MEASURES. SEE THE CONSTRUCTION SEQUENCE FOR ORDER OF INSTALLATION.
<br />S. EXCAVATED MATERIAL SHALL BE PLACED ON THE UPHILL SIDE OF TRENCHES, UNLESS INCONSISTENT WITH SAFETY OR SITE
<br />CONSTRAINTS.
<br />6. THE CONSTRUCTION PLANS INDICATE INSTALLATION OF BEST MANAGEMENT PRACTICES (BMPS) TO RETAIN ALL SEDIMENT ON
<br />SITE. ADDITIONAL MEASURES ARE NORMALLY NEEDED TO REMOVE TURBIDITY AND MEET WATER QUALITY STANDARDS.
<br />DURING CONSTRUCTION, THE CONTRACTOR SHALL INSTALL SUCH ADDITIONAL COUNTY APPROVED BMPS AS MAY BE
<br />REQUIRED, E.G. BAKER TANK$ OR OTHER SEDIMENTATION FACILITIES, TO PREVENT SEDIMENT OR TURBID WATER FROM
<br />LEAVING THE SITE. THE CONTRACTOR MAY CONTACT THE DESIGN ENGINEER (OR THE OWNER'S DESIGNATED EROSION
<br />CONTROL PERSON) FOR GUIDANCE ON ADDITIONAL MEASURES.
<br />7. STABILIZE ALL EXPOSED AND NON -WORKED SOIL.
<br />B. FROM APRIL 1 TO SEPTEMBER 30 NO UN -WORKED SOIL MAY REMAIN EXPOSED FOR MORE THAN 7 DAYS.
<br />9. COVER DENUDED AREAS AS SPECIFIED ON THE PLAINS BY APPROPRIATE COVER BMPS (SUCH A$ MULCH, SOD, PLASTIC, AND
<br />STRAW). WHERE STRAW MULCH IS REQUIRED, IT SHALL BE APPLIED A MINIMUM OF 2".
<br />10. COVER MATERIAL SHALL BE STOCKPILED ON SITE.
<br />11. SOIL STOCKPILES SHALL BE STABILIZED AND PROTECTED WITH SEDIMENT RETENTION BMPS WITHIN 24 HOURS.
<br />12. GRADING AND CONSTRUCTION SHALL BE TIMED AND CONSTRUCTED IN STAGES TO MINIMIZE SOIL EXPOSURE.
<br />CONSTRUCTION $HALL BE TIMED TO RECOGNIZE CONDITIONS CREATED BY THE WEATHER.
<br />13. FROM OCTOBER 1 TO MARCH 31 NO UN -WORKED SOIL MAY REMAIN EXPOSED FOR MORE THAN 2 DAYS,
<br />14. AN ESTABLISHED GROUND COVER THAT FULFILLS THE REQUIREMENT OF THE APPROVED CONSTRUCTION PLANS IS
<br />REQUIRED FOR ACCEPTANCE BY THE COUNTY. WHERE POSSIBLE, MAINTAIN NATURAL VEGETATION FOR SILT CONTROL.
<br />a. ALLAREASTO BE SEEDED$HALL BE CULTIVATED BY DISKING. RAKING, HARROWING OR OTHER ACCEPTABLE MEANS.
<br />b. PERFORM ALL CULTIVATING ACROSS OR AT RIGHT ANGLES TO THE SLOPE.
<br />c. COVER THE SITE WITH MULCH, TOPSOIL OR OTHER SOIL AMENDMENTS.
<br />d. IF NECESSARY, SURFACE RUNOFF CONTROL MEASURES SUCH AS GRADIENT TERRACES, INTERCEPTOR DIKE/SWALES,
<br />LEVEL SPREADERS, AND SEDIMENT BASINS SHALL BE INSTALLED PRIOR TO SEEDING.
<br />e. IMMEDIATELY FOLLOWING FINISH GRADING, PERMANENT VEGETATION $HALL BE APPLIED (MINIMUM 60# PER ACRE),
<br />UNLESS OTHERWISE NOTED AS A WETLAND RESTORATION AREA OR OTHERWISE APPROVED FOR ALTERNATIVE
<br />LANDSCAPING TREATMENT. THIS IS TO INCLUDE THE FOLLOWING: 35% PERENNIAL RYE GRASS, 50% CREEPING RED
<br />FESCUE, 15% COLONIAL BENT GRASS.
<br />f. FERTILIZER SHALL BE APPLIED AT 400# PER ACRE OF 10-20-20 (10 POUNDS PER 1100 SQUARE FEET) OR EQUIVALENT.
<br />DEVELOPMENTS ADJACENT TO WATER BODIES SHALL USE NON -PHOSPHORUS FERTILIZER.
<br />15. UNLESS IN A WETLAND RESTORATION AREA OR AN AREA APPROVED FOR ALTERNATIVE LANDSCOAPING TREATMENT, ALL
<br />DISTURBED AREAS SHALL BE SEEDED WITH A PERENNIAL GROUND COVER USING AN APPROVED HYDROSEEDER OR AS
<br />OTHERWISE APPROVED BY SNOHOMISH COUNTY.
<br />16. PROTECT CUT AND FILL SLOPES FROM EROSIVE FLOWS AND CONCENTRATED FLOWS UNTIL PERMANENT COVER AND
<br />DRAINAGE CONVEYANCE SYSTEMS ARE IN PLACE.
<br />17. INSTALL INLET PROTECTION ON ALL STORM DRAIN INLETS DURING CONSTRUCTION SO THAT SEDIMENT AND SILT LADEN
<br />WATER IS FILTERED OR TREATED TO MINIMIZE SEDIMENT THAT ENTERS THE INLET.
<br />18. CHANNELS, DITCHES, SWALES AND OTHER CONVEYANCE SYSTEMS SHALL BE STABILIZED TO PREVENT EROSION DURING AND
<br />AFTER CONSTRUCTION. INSTALL OUTLET PROTECTION FOR ALL CULVERTS.
<br />19. FOLLOW THE SPECIFIC REQUIREMENTS ON THE PLAN TO CONTROL POLLUTANTS DURING CONSTRUCTION. THE CONTRACTOR
<br />AND OWNER SHALL DEVELOP ON GOING PLANS TO CONTROL POLLUTANTS GENERATED DURING CONSTRUCTION, INCLUDING
<br />WASTE MATERIALS AND DEMOLITION DEBRIS. THIS INCLUDES MAINTENANCE OF CONSTRUCTION EQUIPMENT, FERTILIZERS,
<br />APPLICATION OF CHEMICALS, AND WATER TREATMENT SYSTEMS. THE PLANS SHALL BE UPDATED TO RESPOND TO SITE
<br />EXPOSURE AND WEATHER CONDITIONS.
<br />20, THE WATER FROM DE -WATERING SYSTEMS FOR TRENCHES, VAULTS AND FOUNDATIONS SHALL BE DISCHARGED INTO A
<br />CONTROLLED SYSTEM OR SEDIMENT RETENTION BMP (I.E. BAKER TANK). ADDITIONAL MEASURES ARE NEEDED TO REMOVE
<br />TURBIDITY AND MEET WATER QUALITY STANDARDS. UNFILTERED WATER MUST NOT BE RELEASED INTO SENSITIVE AREAS
<br />SUCH AS WETLANDS OR DESIGNATED NGPA AREAS. WATER POLLUTION CONTROL SHALL COMPLY WITH SCC 7.53.
<br />21. THE OWNER AND CONTRACTOR ARE RESPONSIBLE FOR WATER QUALITY AS FURTHER DEFINED IN THE PROJECT
<br />SPECIFICATIONS, THE CONTRACTOR'S CERTIFIED EROSION CONTROL SPECIALIST SHALL BE RESPONSIBLE FOR INSPECTION
<br />AND THE WATER QUALITY MONITORING PROGRAM AND SHALL REPORT TO THE OWNER AND TO THE COUNTY AS REQUIRED.
<br />22. THE CONSTRUCTION EROSION CONTROL BMPS SHALL BE INSPECTED AFTER EACH SIGNIFICANT RAIN EVENT. MAINTENANCE
<br />SHALL BE PERFORMED AS NEEDED TO MAINTAIN THE PERFORMANCE AND FUNCTION.
<br />a. SILT BARRIERS AND SEDIMENT PONDS (IF USED) SHALL BE INSPECTED IMMEDIATELY AFTER EACH RAINFALL AND AT
<br />LEAST DAILY DURING PROLONGED RAINFALL.
<br />b. NECESSARY REPAIRS TO BARRIERS, CHANNELS, AND PONDS (IF USED) OR REPLACEMENT SHALL BE ACCOMPLISHED
<br />PROMPTLY.
<br />c. SEDIMENT DEPOSITS SHOULD BE REMOVED AFTER EACH RAINFALL FROM SILT BARRIERS AND CHECK DAMS.
<br />d. WHEN THE SEDIMENT REACHES THE CLEAN OUT LEVEL IN A SEDIMENT POND, IT SHALL BE REMOVED AND PROPERLY
<br />DISPOSED. DEPOSITS MUST BE REMOVED WHEN THE LEVEL OF DEPOSITION REACHES APPROXIMATELY ONE-THIRD
<br />THE HEIGHT OF THE BARRIER, CHECK DAM OR OTHER CATCHMENT.
<br />e. IF USED, THE EMBANKMENT OF SEDIMENT BASINS SHALL BE CHECKED REGULARLY TO INSURE THAT IT IS
<br />STRUCTURALLY SOUND AND HAS NOT BEEN DAMAGED BY EROSION OR CONSTRUCTION EQUIPMENT.
<br />f. THE EMERGENCY SPILLWAY OF A SEDIMENT POND SHALL BE CHECKED REGULARLY TO INSURE THAT ITS LINING IS
<br />WELL ESTABLISHED AND EROSION -RESISTANT.
<br />g. ANY SEDIMENT DEPOSITS REMAINING IN PLACE AFTER THE BARRIER IS NO LONGER REQUIRED SHALL BE DRESSED TO
<br />CONFORM TO THE EXISTING GRADE, PREPARED AND SEEDED.
<br />EROSION RISK ASSESSMENT
<br />FACTORS ANTICIPATED TO CREATE RISK OF EROSION THROUGHOUT THE PROJECT INCLUDE EXPOSURE OF EXCAVATED $OIL$
<br />TO RAINFALL AND DISTURBANCE OF THE PROJECT SITE BY HEAVY EQUIPMENT. HEAVY RAINFALL CAN ERODE SOILS AND LEAD TO
<br />TRANSPORT OF SEDIMENTS OVERLAND, THROUGH OPEN SEWER OR STORM PIPES AS THEY ARE CONSTRUCTED, OR IN
<br />DRAINAGE DITCHES. DEWATERING OF THE TRENCHES AND LIFT STATION EXCAVATION WILL ALSO CREATE A RISK OF SEDIMENT
<br />TRANSPORT, RELATIVE TO THE AMOUNT OF WATER THAT MUST BE REMOVED. THE SOURCES OF WATER FOR DEWATERING
<br />INCLUDE RAINFALL, STORMWATER FLOW, AND GROUNDWATER FLOW.
<br />SWPPP EROSION CONTROL PLAN
<br />(EXCERPTS OF THE CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN -THIS PLAN MAY BE REVISED BY THE EROSION CONTROL SPECIALIST TO MEET
<br />FIELD CONDITIONS, IF NECESSARY.)
<br />1. EROSION PROBLEM AREAS
<br />a. THERE ARE CURRENTLY NO KNOWN EROSION PROBLEM AREAS ON SITE. HOWEVER EROSION IS A POSSIBILITY DURING CONSTRUCTION. THE RISK OF
<br />EROSION IN THIS AREA MAY BE MITIGATED THROUGH THE USE OF PROPER BEST MANAGEMENT PRACTICES AS DESCRIBED BELOW. SINCE RAINFALL ON THE
<br />SITE IS LIKELY TO BE A PRINCIPAL CAUSE OF EROSION, THE RISK OF EROSION WILL BE REDUCED BY SCHEDULING EARTHWORK FOR THE DRY SUMMER
<br />SEASON.
<br />b. IF THIS PROJECT CONTINUES INTO THE WINTER SEASON, THE FOLLOWING WET WEATHER PRECAUTIONS WILL BE PRACTICED.
<br />I. PREVENTION OF TRACKING MUD ONTO ROAD$ THROUGH THE USE OF EQUIPMENT SWEEPING ONSITE.
<br />it. EXPOSED PORTIONS OF THE SITE SHALL BE ADEQUATELY COVERED BY STRAW OR OTHER MATERIAL BASED UPON THE WEATHER. STRAW OR
<br />APPROVED EQUIVALENT MATERIAL SHALL ALWAYS BE AVAILABLE ON SITE AND READY TO USE. EXPOSED AREAS SHALL BE ADEQUATELY COVERED
<br />WHEN RAINING AND AT THE END OF THE DAY IF THE NEXT DAY IS A"NON-WORKING DAY. WEATHER FORECASTS SHALL BE USED TO GOVERN
<br />WHETHER WORK WILL COMMENCE OR STOP FOR THE DAY.
<br />iii. ALL SITE WORK GENERATING EXPOSED $OIL (WITH THE EXCEPTION OF INSTALLATION AND MAINTENANCE OF EROSION CONTROL BMPS) $HALL CEASE
<br />DURING WEATHER CONDITIONS WHEN RAIN GENERATES RUNOFF AND CAUSES EROSION.
<br />iv. IF NECESSARY, EARTHWORK SHALL BE PHASED TO MINIMIZE AREAS OF EXPOSED SOIL.
<br />v. THE CONTRACTOR SHALL DEVISE A MAINTENANCE AND INSPECTION SCHEDULE WITH AN IDENTIFIED EROSION CONTROL SPECIALIST RESPONSIBLE
<br />FOR THESE ITEMS.
<br />vi. AN EROSION CONTROL SPECIALIST SHALL BE PRESENT OR ON -CALL THROUGHOUT THE PROJECT DURATION TO INSURE THE BMPS ARE WORKING
<br />APPROPRIATELY AND ARE WELL MAINTAINED. THE SPECIALIST SHALL MONITOR THE DISCHARGE FROM THIS SITE AFTER EACH STORM EVENT THAT
<br />GENERATES RUNOFF. THEY SHALL ALSO CONDUCT SITE INSPECTION REPORTS ON THE INSTALLED BMPS. THESE REPORTS SHALL BE AVAILABLE ON
<br />SITE AND PROVIDED TO SNOHOMISH COUNTY ON A MONTHLY BASIS AND WHEN REQUESTED. THE MONITORING SHALL BE DONE IN A PROFESSIONAL
<br />MANNER CONSISTENT WITH CURRENT SAMPLING PROTOCOLS AND REPORTING REQUIREMENTS.
<br />vii. VEGETATED BUFFERS AND CRITICAL AREAS SHALL BE PROTECTED, ESPECIALLY THROUGH THE USE OF SILT FENCES AND MINIMIZATION OF SOIL
<br />EXPOSURE.
<br />AIR. IF NECESSARY, WATER FROM THE PROJECT SITE SHALL BE FILTERED THROUGH AN APPROVED DEVICE SUCH AS A BAKER TANK, PRIOR TO RELEASING
<br />IT TO THE VEGETATED WETLAND AREA. THE CONTRACTOR SHALL CREATE/MODIFY THE DEWATERING PLAN BASED UPON SITE CONDITIONS AND SHALL
<br />ATTACH IT TO THIS STORMWATER POLLUTION PREVENTION PLAN (SWPPP).
<br />2. CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN ELEMENTS
<br />a. MARK CLEARING LIMITS(BMP C103- HIGH VISIBILITY PLASTIC)
<br />THE CONTRACTOR SHALL MARK CLEARING LIMITS AT THE LIFT STATION SITE, AS SHOWN ON THE PLANS.
<br />b. ESTABLISH CONSTRUCTION ACCESS (BMP C105-STABILIZED CONSTRUCTION ENTRANCE)
<br />CONSTRUCTION ACCESS WILL BE PAVED ROAD$. AS A PROTECTIVE MEASURE, STREET SWEEPING WILL BE PERFORMED WHEN REQUIRED..
<br />c. CONTROL FLOW RATES )BMP C200 - INTERCEPTOR SWALE: BMP C206 - LEVEL SPREADER)
<br />GROUNDWATER FLOW SHALL BE REDUCED BY EXCAVATING DURING DRYER MONTHS WHEN THE WATER TABLE IS LOWEST. FLOW CONTROL MEASURES
<br />SUCH AS INTERCEPTOR TRENCHES OR LEVEL SPREADERS SHALL BE IMPLEMENTED IF NEEDED DURING CONSTRUCTION.
<br />d. INSTALL SEDIMENT CONTROLS (BMP C233 - SILT FENCE)
<br />SEDIMENT CONTROLS INCLUDE A SILT FENCE ALONG THE PERIMETER OF THE SITE, COVERING OF $OIL STOCKPILES, AND INSTALLATION OF STRAW WHEN
<br />NECESSARY. EROSION CONTROL BMPS SHALL BE INSTALLED PRIOR TO LAND DISTURBING ACTIVITIES AS NOTED ON THE PLANS. THE EXISTING 24-INCH
<br />CPE CULVERT SHALL BE EXTENDED TO THE SOUTH PROPERTY LINE PRIOR TO COMMENCING SIGNIFCANT GRADING ACTIVITY, TO FACILITATE PROTECTION
<br />OF THE CULVERT INLET. THE SITE SHALL ALSO BE MONITORED AND TESTED SO THAT TURBIDITY IN THE WATER LEAVING THE AREA WILL NOT EXCEED 5
<br />NTU ABOVE BACKGROUND.
<br />e. STABILIZE SOILS BMP C122- NETS AND BLANKETS: BMP C123- PLASTIC COVERING)
<br />TO PROTECT THE SOIL STOCKPILES FROM EROSIVE FORCES SUCH AS RAIN, PLASTIC SHEETING, JUTE MATS OR SIMILAR BMPS WILL BE PLACED UPON
<br />EXPOSED AND NON -WORKED SOIL THROUGHOUT CONSTRUCTION. PER WET WEATHER REQUIREMENTS, THESE BMPS WILL BE PLACED WITHIN 2 DAYS OF
<br />STOCKPILING THE SOIL FROM OCTOBER 1ST THROUGH APRIL 30TH OR IF RAINING.
<br />f. PROTECT SLOPES )BMP C122- NETS AND BLANKETS)
<br />ANY SLOPES IN THE VICINITY OF THE PROJECT SITE SHALL BE PROTECTED FROM CONCENTRATED FLOWS. STOCKPILE SLOPES SHALL BE PROTECTED AS
<br />MENTIONED IN THE "STABILIZE SOILS' SECTION.
<br />g. PROTECT DRAIN INLETS (BMP C220 -STORM DRAIN INLET PROTECTION)
<br />TO PREVENT SEDIMENT FROM MOVING INTO ANY NEARBY STORM SYSTEM, CATCH BASIN INLET PROTECTION SHALL BE USED WHERE NECESSARY IN THE
<br />VICINITY OF THE PROJECT. INLETS AND CULVERT ENTRANCE$ SHALL BE INSPECTED WEEKLY AT A MINIMUM AND DAILY DURING STORM EVENTS AS NOTED
<br />ON THE PLANS, SEDIMENT SHALL NOT ACCUMULATE GREATER THAN SIX INCHES IN DEPTH WITHIN THE INLET PROTECTION DEVICE.
<br />h. STABILIZE CHANNELS AND OUTLETS(BMP C209- OUTLET PROTECTION)
<br />CULVERT INLETS AND OUTLETS SHALL BE ARMORED WITH QUARRY SPALLS AS SHOWN ON THE PLANS.
<br />I. CONTROL POLLUTANTS (BMP C233- SILT FENCE)
<br />GOOD HOUSEKEEPING PRACTICES AND APPROPRIATE BMPS AS SHOWN ON THE PLANS AND APPROVED BY SNOHOMISH COUNTY WILL BE UTILIZED TO
<br />CONTROL POLLUTANTS ON THE SITE. TO ENSURE THIS, A NOTE IS STATED ON THE PLANS REQUIRING ALL POLLUTANTS ON SITE TO BE HANDLED AND
<br />DISPOSED OF IN A MANNER THAT DOES NOT CAUSE CONTAMINATION OF SURFACE WATER. ANY WATER THAT IS USED TO CLEAN EQUIPMENT OR IS
<br />PUMPED FROM THE EXISTING DRAINAGE FACILITIES SHALL BE FILTERED THROUGH AN APPROVED FILTERING DEVICE AND TESTED PRIOR TO DISCHARGING
<br />TO AN UNDEVELOPED PORTION OF THE SITE.
<br />j. CONTROL DEWATERING (BMP C251 -CONSTRUCTION STORMWATER FILTRATION)
<br />ANY TURBID WATER FROM DEWATERING OPERATIONS THAT MAY OCCUR THROUGHOUT THIS PROJECT SHALL BE CONVEYED TO AN APPROVED FILTER
<br />SUCH AS A BAKER TANK AND THEN RELEASED TO AN UNDISTURBED AREA ON SITE. ALL MEASURES SHALL COMPLY WITH SCC 7.53. IF DEWATERING IS
<br />REQUIRED THE CONTRACTOR SHALL CREATE/MODIFY THE DEWATERING PLAN BASED UPON SITE CONDITIONS AND SHALL ATTACH IT TO THE
<br />STORMWATER POLLUTION PREVENTION PLAN (SWPPP).
<br />k. MAINTAIN BMPS
<br />THE BMPS SHOWN ON THE PLANS SHALL BE MAINTAINED AND REPAIRED AS NEEDED. SPECIFIC MAINTENANCE REQUIREMENTS ARE LISTED IN THE NOTES
<br />AND/OR DETAILS ON THE PLANS AS WELL AS IN THE DRAINAGE REPORT. MONITORING SHALL BE CONDUCTED BY THE DESIGNATED EROSION CONTROL
<br />SPECIALIST TO INSURE BMPS ARE WORKING EFFECTIVELY AND ARE NOT DAMAGING FACILITIES OR WATERWAYS DOWNSTREAM OF THE SITE. A NOTE HAS
<br />BEEN ADDED TO THE PLANS STATING THAT TRAPPED SEDIMENT SHALL BE REMOVED OR STABILIZED ON THE SITE UPON COMPLETION OF THE WORK AS
<br />APPROPRIATE.
<br />I. MANAGE THE PROJECT
<br />EROSION CONTROL SPECIALIST: THE CONTRACTOR'S CERTIFIED EROSION CONTROL SPECIALIST SHALL VERIFY THAT THE ACTIONS NOTED IN THIS
<br />STORMWATER POLLUTION PREVENTION PLAN AND ON THE DRAWINGS ARE IMPLEMENTED.
<br />PHASING OF CONSTRUCTION: THE FIRST ORDER OF WORK WILL INCLUDE INSTALLING APPROPRIATE BMPS FOR EROSION CONTROL. CONSTRUCTION OF
<br />THE NEW 12-INCH BYPASS CULVERT WILL BE REQUIRED AS NOTED ON THE DRAWINGS. PROJECT DEVELOPMENT WILL THEN COMMENCE. THE SITE SHALL
<br />BE PROTECTED AS DESCRIBED IN THIS PLAN AND ON THE DRAWINGS. THROUGHOUT THE WORK, THE CONTRACTOR IS RESPONSIBLE FOR MAINTAINING
<br />ALL BMPS. UPON COMPLETION OF THE WORK, TEMPORARY BMPS SHALL BE REMOVED AS REQUIRED.
<br />SEASONAL WORK LIMITATIONS: WORK IS SCHEDULED FOR THE DRY SEASON HOWEVER, IT MAY BE CONDUCTED DURING THE WET WEATHER SEASON OF
<br />OCTOBER 1 THROUGH MARCH 31ST. ALL STOCKPILES SHALL BE COVERED WITH PLASTIC SHEETING, STRAW (OR EQUAL) TO MINIMIZE ANY LOSS OF SOIL
<br />DURING THE WET WEATHER. THE CONTRACTOR WILL BE RESPONSIBLE FOR CONSISTENTLY MONITORING THE OUTFALLS TO ENSURE ALL APPLICABLE
<br />REQUIREMENTS ARE MET AND THAT WATER QUALITY DOWNSTREAM IS NOT BEING COMPROMISED THROUGHOUT THIS PROCESS. IN ADDITION, THE
<br />CONTRACTOR'S CERTIFIED EROSION CONTROL SPECIALIST WILL BE RESPONSIBLE FOR ENSURING PROPER BMP MAINTENANCE IS CONDUCTED
<br />THROUGHOUT THE SEASON AS WELL AS ENSURING THE COUNTY REQUIREMENTS ARE MET THROUGH TESTING AND OTHER APPROPRIATE METHODS.
<br />COORDINATION WITH UTILITIES AND OTHER CONTRACTORS: AS STATED ON THESE PLANS AND IN THE SPECIFICATIONS, THE CONTRACTOR SHALL BE
<br />RESPONSIBLE FOR COORDINATING ANY UTILITY WORK WITH THE APPROPRIATE AGENCIES.
<br />INSPECTION AND MONITORING: THE CONTRACTOR'S EROSION CONTROL SPECIALIST SHALL BE PRESENT OR ON -CALL THROUGHOUT THE PROJECT
<br />DURATION TO INSURE THE BMPS ARE WORKING APPROPRIATELY AND ARE WELL MAINTAINED. THE SPECIALIST $HALL CHOOSE APPROPRIATE MONITORING
<br />SITES AND NOTE THEM ON BOTH THE GROUND AND ON THE FIELD COPY OF THE PLANS. THE SPECIALIST SHALL MONITOR THE DISCHARGE FROM THIS
<br />SITE AFTER EACH STORM EVENT THAT GENERATES RUNOFF. THE SPECIALIST SHALL ALSO CONDUCT SITE INSPECTION REPORTS ON THE INSTALLED
<br />BMPS. THE MONITORING SHALL BE DONE IN A PROFESSIONAL MANNER CONSISTENT WITH CURRENT SAMPLING PROTOCOLS AND REPORTING
<br />REQUIREMENTS.
<br />REPORTING: THE CONTRACTOR IS RESPONSIBLE FOR REPORTING ALL SPILLS OR DISCHARGE OF POLLUTANTS WITHIN 24-HOURS TO THE OWNER. THE
<br />SITE INSPECTION REPORTS MENTIONED ABOVE SHALL BE AVAILABLE ON SITE AND PROVIDED TO SNOHOMISH COUNTY ON A MONTHLY BASIS OR WHEN
<br />REQUESTED.
<br />MAINTENANCE: NO MAINTENANCE ON HEAVY EQUIPMENT IS EXPECTED TO OCCUR ON SITE THROUGHOUT THE PROJECT.
<br />MAINTENANCE OF THE CONSTRUCTION SWPPP: THIS PLAN SHALL BE LOCATED ON SITE AT ALL TIMES. THE PLAN WILL BE REVISED ACCORDINGLY IF
<br />SIGNIFICANT CHANGES HAVE BEEN MADE TO THE DESIGN, CONSTRUCTION, OPERATION, OR MAINTENANCE OF ANY BMPS.
<br />m. PROTECT LOW IMPACT DEVELOPMENT FACILITIES
<br />NO LOW IMPACT DEVELOPMENT FACILITIES ARE INTENDED FOR THIS SITE.
<br />DEWATERING PLAN
<br />DEWATERING DISCHARGE
<br />CONTRACTOR SHALL DESIGN, PROVIDE, INSTALL, OPERATE AND MANAGE DEWATERING DISCHARGE
<br />FACILITIES TO ACCOMMODATE THE ENCOUNTERED FLOWS IN A MANNER THAT WILL PREVENT EROSION
<br />THE CONTRACTOR SHALL NOT ALLOW THE WATER DISCHARGED FROM ANY DEWATERING SYSTEM
<br />WELLS OR SUPPLEMENTAL WATER CONTROL SYSTEMS (I.E. SUMPS) TO DEGRADE THE WATER QUALITY
<br />OF ANY RECEIVING WATERS.
<br />THE DEWATERING DISCHARGE SYSTEM SHALL OPERATE SUCH THAT WATER PUMPED DURING
<br />DEWATERING OPERATIONS IS DISCHARGED TO ADJACENT LANDS FOR INFILTRATION ANDIOR
<br />CONTROLLED OVERLAND FLOW. THE SYSTEM SHALL DISPOSE OF WATER SO AS NOT TO CAUSE
<br />DAMAGE TO PUBLIC OR PRIVATE PROPERTY, TO CAUSE EXCEEDANCES OF WATER QUALITY STANDARDS
<br />OR TO CAUSE A NUISANCE OR MENACE TO THE PUBLIC.
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<br />CONTRACTOR SHALL OBTAIN ACCESS PERMISSION FROM PRIVATE PROPERTY OWNERS FOR ANY
<br />DISCHARGE.
<br />THE DEWATERING DISCHARGE SYSTEM SHALL MAINTAIN WATER QUALITY STANDARDS FOR SURFACE
<br />WATERS BY PERFORMING IN COMPLIANCE WITH CHAPTER 173-201A WAC, WATER QUALITY STANDARDS
<br />FOR SURFACE WATERS OF THE STATE OF WASHINGTON, AND ALL REQUIRED PERMITS, INCLUDING BUT
<br />NOT LIMITED TO THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM GENERAL PERMIT FOR
<br />CONSTRUCTION ACTIVITY.
<br />THE CONTRACTOR SHALL INSTALL, OPERATE, AND MAINTAIN A WATER TREATMENT SYSTEM TO PROVIDE
<br />FOR SETTLING, FILTRATION (IF NEEDED) AND REMOVAL OF SUSPENDED SOLIDS IN THE DISCHARGE
<br />FROM THE DEWATERING SYSTEM.
<br />THE DISCHARGE SYSTEM MAY CONSIST OF ANY COMBINATION OF CONVEYANCE PIPING, VISQUEEN
<br />PADS, FILTER BAGS, DRIP IRRIGATION, SLOTTED OR PERFORATED DISCHARGE PIPING, SPRAY
<br />IRRIGATION, OR OTHER MEANS TO APPLY THE WATER OVER A LARGE AREA AT LOW VELOCITY, IN SUCH
<br />A MANNER AS TO CAUSE NO EROSION, REMOVAL OF TOPSOIL, OR VIOLATION OF WATER QUALITY
<br />STANDARDS IN THE RECEIVING WATERS.
<br />CONTRACTOR SHALL ADD OR MOVE DISCHARGE COMPONENTS AS NEEDED TO ENSURE NO OVERLAND
<br />FLOW CAUSES $OIL EROSION, LEAVES THE PROJECT SITE, ENTER$ THE ADJACENT PROPERTIES OR
<br />ROADWAYS, ENTERS THE ACTIVE CONSTRUCTION AREA, OR CAUSES A VIOLATION OF WATER QUALITY
<br />STANDARDS IN THE RECEIVING WATERS.
<br />CONTRACTOR SHALL PROVIDE SUFFICIENT DISCHARGE TUBING, FILTER BAGS, OR OTHER DISCHARGE
<br />SYSTEMS TO POTENTIALLY APPLY WATER OVER AS MUCH AREA AVAILABLE FOR DISCHARGE AS
<br />NEEDED, IF REQUIRED, TO ALLOW SUFFICIENT INFILTRATION TO MITIGATE EROSION ISSUES.
<br />FILTER BAGS SHALL BE OF SUFFICIENT NUMBER, SIZE, AND CAPACITY TO HANDLE ANTICIPATED FLOW
<br />RATES, AND MUST BE INSPECTED, MAINTAINED, AND REPLACED WHEN FULL OR DAMAGED. SLOTTED OR
<br />PERFORATED DRAIN PIPE, IF USED, MUST BE DESIGNED TO DISCHARGE ALONG THE ENTIRE LENGTH AT
<br />EQUAL PRESSURES.
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<br />THE CONTRACTOR SHALL PROVIDE TREATMENT OF THE DISCHARGE INCLUDING SUFFICIENT SEDIMENT
<br />SETTLING CAPACITY (PONDS, STORAGE TANKS, ETC.) TO ENSURE DISCHARGE DOES NOT EXCEED
<br />TURBIDITY STANDARDS AT THE RECEIVING WATERS; AND 10 PPM SUSPENDED SOLIDS (SILT, SILICA,
<br />SEDIMENT ETC.) AS MEASURED USING A ROSSUM $AND TESTER IMMEDIATELY PRIOR TO DISCHARGE TO
<br />THE DESIGNATED DISCHARGE AREA.
<br />THE DEWATERING DISCHARGE TREATMENT SYSTEM SHALL INCLUDE ANY STORAGE TANKS, PLUMBING,
<br />PUMPS, FILTRATION SYSTEMS, OTHER EQUIPMENT, APPURTENANCES, AND RELATED WORK TO
<br />PERFORM THE FUNCTION OF WATER TREATMENT.
<br />196Y9:CtiCH�LP]:IYC ]:IL`C
<br />THE CONTRACTOR'S EROSION CONTROL SPECIALIST SHALL ANALYZE DISCHARGE FOR TURBIDITY
<br />HOURLY DURING THE FIRST FOUR HOURS OF TESTING, DAILY DURING FIRST WEEK, WEEKLY
<br />THEREAFTER, AND AFTER ANY RAINFALL EVENT EXCEEDING 0.25 INCHES PER DAY, WITH A FIELD
<br />TURBIDITY METER USING STANDARD METHOD 2130 (STANDARD METHODS FOR THE EXAMINATION OF
<br />WATER AND WASTEWATER). THE CONTRACTOR SHALL MEASURE TURBIDITY AT ALL DISCHARGE POINTS
<br />TO RECEIVING WATERS OR WETLANDS, AND BACKGROUND. TURBIDITY SHALL BE CALCULATED AS THE
<br />AVERAGE (MEAN) FOR ANY NUMBER OF SAMPLES. THE NUMBER AND TIMING OF SAMPLES SHALL BE
<br />THE SAME FOR EACH SAMPLING STATION (I.E., BACKGROUND AND DISCHARGE POINTS). THE
<br />CONTRACTOR $HALL PROVIDE ADDITIONAL TREATMENT PRIOR TO DISCHARGE, AS NECESSARY, TO
<br />MEET THE DISCHARGE LIMITS.
<br />THE CONTRACTOR SHALL VISUALLY INSPECT THE DISCHARGE SYSTEM DAILY FOR SYSTEM OPERATION,
<br />OVERLAND FLOW, EROSION, AND TURBIDITY THROUGHOUT THE TESTING.
<br />THE CONTRACTOR SHALL SUBMIT WEEKLY MONITORING REPORTS TO THE OWNER'S DESIGNATED
<br />REPRESENTATIVE DOCUMENTING THE REQUIREMENTS HEREIN.
<br />1. ATTEND PRE -CONSTRUCTION MEETING.
<br />2. INSTALL CATCH BASIN PROTECTION.
<br />3. INSTALL PERIMETER PROTECTION (SILT FENCE, NPGA AREAS, BRUSH BARRIER, ETC.)
<br />4. CONDUCT SITE CLEARING AND GRADING.
<br />5. INSTALL DRAINAGE FACILITIES AND OTHER UTILITIES.
<br />6. COMPLETE PROJECT PER THE PROJECT PLAN
<br />7. MAINTAIN EROSION CONTROL MEASURES IN ACCORDANCE WITH LOCAL JURISDICTION
<br />REQUIREMENTS AND MANUFACTURER'S RECOMMENDATIONS.
<br />B. RELOCATE SURFACE WATER CONTROLS OR EROSION CONTROL MEASURES, OR INSTALL
<br />NEW MEASURES $O THAT AS SITE CONDITIONS CHANGE, THE EROSION AND SEDIMENT
<br />CONTROL IS ALWAYS IN ACCORDANCE WITH LOCAL JURISDICTION REQUIREMENTS.
<br />9. COVER ALL AREAS THAT WILL BE UNWORKED FOR MORE THAN TWO DAYS BETWEEN
<br />OCTOBER 1ST AND APRIL 30TH OR SEVEN DAYS BETWEEN MAY 1ST AND SEPTEMBER 30TH.
<br />10. STABILIZE ALL AREAS WITHIN SEVEN DAYS OF REACHING FINAL GRADE.
<br />11. SEED OR SOD ANY AREAS TO REMAIN UNWORKED FOR MORE THAN 30 DAYS.
<br />12. UPON COMPLETION OF THE PROJECT, STABILIZE ALL DISTURBED AREAS AND REMOVE
<br />TEMPORARY BMPS.
<br />L city of Everett
<br />EVERETT RevimW for Permit 10/29/2020
<br />0 1" 2"
<br />1
<br />TWO INCHES AT FULL SCALE.
<br />IF NOT, SCALE ACCORDINGLY
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<br />SHEET: G-3
<br />OF: 6
<br />JOB NO.: 20476.00
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