C3.5 SWPPP NOTES & DETAILSNORTH
KEY PLAN
DRAWING NUMBER
DRAWING TITLE
CLIENT
4201 cedar avenue so. - minneapolis, MN 55407
tel. (612) 904-1332 - fax (612) 904-7366
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PROJECT NUMBER 21602.0A
REVISION DATE DESCRIPTION BY
1891 Arboretum Boulevard
Chanhassen, MN 55317
Xcel Energy
Service Center
Chanhassen
Title: Zachary B. Moen - PE
Registration Number: 58688
Date: XX/XX/XXXX
By:
Title: Professional Engineer
I hereby certify that this drawing was prepared by
me or under my direct supervision and that I am
a duly licensed Professional Engineer under the
laws of the State of Minnesota.
LOUCKS PROJECT NO. 21602
10/25/2022 WATERSHED SUBMITTAL
11/16/2022 TEP SUBMITTAL
11/16/2022 SCHEMATIC DESIGN PACKAGE
12/05/2022 SD PACKAGE ADDENDUM
01/12/2023 CITY SUBMISSION
C3.5
SWPPP NOTES
& DETAILS
SWPPP NOTES
SITE VICINITY MAP
CONSTRUCTION STORMWATER SPECIAL WATERS SEARCH MAP
PROJECT SITE
*
BIO-ROLL OR
ROCK LOG
NOTES:
1.PLACE BOTTOM EDGE OF WIRE FENCE INTO 6 IN DEEP TRENCH.
2.POSTS SHALL BE:
·6 FT MAX. SPACING.
·STANDARD STEEL T-TYPE POSTS.
·5' MIN. LENGTH POSTS, DRIVEN 2 FT INTO THE GROUND.
3.ATTACH WIRE FENCE TO STEEL POSTS WITH NO. 9 GA. ALUMINUM WIRE OR NO. 9
GALVANIZED STEEL PRE-FORMED CLIPS.
4.ATTACH FABRIC TO WIRE FENCING WITH WIRE OR ZIP TIES. A MIN. OF 3 ZIP TIES
PER POST. EXTEND BOTTOM OF FABRIC INTO TRENCH.
5.BACKFILL TRENCH & COMPACT.
6.STRAW, WOOD CHIP, COMPOST OR ROCK LOGS PER MNDOT SPECS 3890, 3897.
DRAWN 11/2016
LOUCKS PLATE NO.
3002LOUCKS
2'' X 2'' X 18'' LONG WOODEN
STAKES AT 2'-0'' SPACING. DRIVE
THROUGH NETTING, NOT
PENETRATING FIBER LOG.
STRAW OR WOOD FIBER 9"
OR 12'' DIA. SEDIMENT
LOG ROLL ENCLOSED IN
POLYPROPYLENE NETTING
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TRENCH IF LOOSE SOILS
FLOW
ENDS SECURELY CLOSED TO PREVENT
LOSS OF OPEN GRADED AGGREGATE
FILL. SECURED WITH 50 PSI. ZIP TIE
1
NOTES:
SEE SPECS. 2573, 3137, 3890 & 3897.
MANUFACTURED ALTERNATIVES LISTED ON Mn/DOT'S APPROVED
PRODUCTS LIST MAY BE SUBSTITUTED.
1.GEOTEXTILE SOCK BETWEEN 4-10 FEET LONG AND 4-6 INCH
DIAMETER. SEAM TO BE JOINED BY TWO ROWS OF STITCHING
WITH A PLASTIC MESH BACKING OR PROVIDE A HEAT BONDED
SEAM (OR APPROVED EQUIVALENT). FILL ROCK LOG WITH
OPEN GRADED AGGREGATE CONSISTING OF SOUND DURABLE
PARTICLES OF COARSE AGGREGATE CONFORMING TO SPEC.
3137 TABLE 3137-1; CA-3 GRADATION.
EROSION CONTROL BLANKET
6"
6"
1' TO 3'ANCHOR TRENCH
1.DIG 6"X6" TRENCH
2.LAY BLANKETS IN TRENCH
3.STAPLE AT 1.5' INTERVALS
4.BACKFILL WITH NATURAL SOIL
AND COMPACT.
5.BLANKET LENGTH SHALL NOT
EXCEED 100' WITHOUT AN
ANCHOR TRENCH
NOTE:
SLOPE SURFACE SHALL BE FREE OF ROCKS, SOIL CLUMPS,
STICKS, VEHICLE IMPRINTS, AND GRASS. BLANKETS SHALL
HAVE GOOD SOIL CONTACT.
ANCHOR TRENCH
(SEE DETAIL AND NOTES BELOW)
OVERLAP END JOINTS MINIMUM
OF 6" AND STAPLE OVERLAP AT
1.5' INTERVALS.
OVERLAP LONGITUDINAL
JOINTS MINIMUM OF 6"
STAPLE PATTERN/DENSITY
SHALL FOLLOW
MANUFACTURERS
SPECIFICATIONS.
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STAGGER JOINTS
DRAWN 2/2016
LOUCKS PLATE NO.
3016LOUCKS
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PROJECT SITE
1.THE NATURE OF THIS PROJECT WILL CONSIST OF CONSTRUCTING PROPOSED BUILDINGS, SURFACE
PAVEMENTS, UTILITIES, AND STORMWATER MANAGEMENT SYSTEMS.
2.THE INTENDED SEQUENCING OF MAJOR CONSTRUCTION ACTIVITIES ARE AS FOLLOWS:
1.INSTALL VEHICLE TRACKING BMP (SUMMER 2023)
2.INSTALL INLET PROTECTION (SUMMER 2023)
3.INSTALL SILT FENCE AROUND SITE (SUMMER 2023)
4.CLEAR AND GRUB SITE (SUMMER 2023)
5.STRIP AND STOCKPILE TOPSOIL (SUMMER 2023)
6.REMOVE PAVEMENTS AND UTILITIES (SUMMER 2023)
7.ROUGH GRADE SITE (SUMMER 2023)
8.IMPORT CLEAN FILL FOR REPLACEMENT AND BALANCE (SUMMER 2023)
9.INSTALL UTILITIES (FALL 2023)
10.INSTALL BUILDING FOUNDATIONS (FALL 2023)
11.INSTALL CURB AND GUTTER (SPRING 2024)
12.INSTALL PAVEMENTS AND WALKS (SPRING 2024)
13.FINAL GRADE SITE (SPRING 2024)
14.REMOVE ACCUMULATED SEDIMENT FROM STORMWATER SYSTEMS (DATE)
15.SEED AND MULCH (SUMMER 2024)
16.WHEN ALL CONSTRUCTION ACTIVITY IS COMPLETE AND THE SITE IS STABILIZED, REMOVE SILT FENCE,
INLET PROTECTION, AND RESEED ANY AREAS DISTURBED BY THE REMOVAL.
3.SITE DATA:
DISTURBED AREA: 17.200 AC
PRE-CONSTRUCTION IMPERVIOUS AREA: 0.000 AC
POST-CONSTRUCTION IMPERVIOUS AREA: 9.415 AC
GENERAL SOIL TYPE:SEE GEOTECHNICAL REPORT B2207371, DATED NOVEMBER 4, 2022,
PROVIDED BY BRAUN INTERTEC
HYDROLOGY INFORMATION: SEE HYDROLOGY REPORT PREPARED BY LOUCKS
4.EROSION AND SEDIMENT CONTROLS WERE DESIGNED TO EFFECTIVELY CONTROL STORMWATER
RUNOFF WITHIN THE PROJECT AREAS. EROSION AND SEDIMENT CONTROL HAVE BEEN PROPOSED TO
MINIMIZE CHANNEL EROSION AND SCOUR IN THE IMMEDIATE VICINITY OF DISCHARGE POINTS.
FACTORS THAT WERE CONSIDERED INCLUDE PROPOSED IMPERVIOUS AREAS, SLOPE OF IMPERVIOUS
SURFACES, STORMWATER INFRASTRUCTURE DISCHARGE POINTS, AND ANNUAL AVERAGE
PRECIPITATION DATA FOR THE PROJECT AREA.
5.CARVER COUNTY RECEIVES AN AVERAGE OF 31 INCHES OF PRECIPITATION PER YEAR. THE FOLLOWING
CARVER COUNTY 24-HOUR STORM EVENTS ARE BASED ON ATLAS 14 RAINFALL DATA:
2-YR 2.87 INCHES
10-YR 4.27 INCHES
100-YR 7.41 INCHES
6.SEE "EXHIBIT: PROPOSED DRAINAGE AREAS" FOR SITE MAP WITH DRAINAGE AREA BOUNDARIES.
7.THE LOCATION OF AREAS NOT TO BE DISTURBED MUST BE IDENTIFIED WITH FLAGS, STAKES, SIGNS, SILT
FENCE, ETC. BEFORE CONSTRUCTION BEGINS.
8.CONTRACTOR SHALL INSTALL RAIN GAUGE ON SITE.
9.GROUNDWATER & DEWATERING
A.REFER TO THE GEOTECHNICAL REPORT BY BRAUN INTERTEC FOR INFORMATION INCLUDING BUT
NOT LIMITED TO GROUNDWATER CONDITIONS AND RECOMMENDATIONS FOR EXCAVATION
DEWATERING.
B.FOLLOW LOCAL, STATE, AND FEDERAL REGULATIONS FOR GROUNDWATER PUMPING AND
OBTAIN ALL NECESSARY PERMITS. A WATER USE PERMIT FROM THE DNR IS REQUIRED WHEN
WITHDRAWING MORE THAN 10,000 GALLONS OF WATER PER DAY OR 1 MILLION GALLONS PER
YEAR.
C.DISPERSE DISCHARGE USING APPROPRIATE ENERGY DISSIPATION MEASURES.
D.BMPS SHALL BE USED TO PREVENT TURBID OR SEDIMENT LADEN WATERS FROM LEAVING SITE.
E.DEWATERING SHALL NOT CAUSE NUISANCE CONDITIONS INCLUDING BUT NOT LIMITED TO
EROSION OR SCOUR IN THE IMMEDIATE VICINITY OF DISCHARGE POINTS OR INUNDATION OF
WETLANDS THAT CAUSES SIGNIFICANT ADVERSE IMPACTS TO THE WETLAND.
10.REFER TO THE GEOTECHNICAL REPORT PREPARED BY BRAUN INTERTEC FOR INFORMATION AND
RECOMMENDATIONS RELATED TO SOIL CONTAMINATION.
11.ALL DISTURBED GROUND LEFT INACTIVE FOR SEVEN (7) OR MORE DAYS SHALL BE STABILIZED BY
SEEDING OR SODDING (ONLY AVAILABLE PRIOR TO SEPTEMBER 15) OR BY MULCHING OR COVERING
OR OTHER EQUIVALENT CONTROL MEASURE.
12.ON SLOPES 3:1 OR GREATER MAINTAIN SHEET FLOW AND MINIMIZE RILLS AND/OR GULLIES, SLOPE
LENGTHS CAN NOT BE GREATER THAN 75 FEET.
13.ALL STORM DRAINS AND INLETS MUST BE PROTECTED UNTIL ALL SOURCES OF POTENTIAL DISCHARGE
ARE STABILIZED.
14.SOIL COMPACTION SHALL BE MINIMIZED DURING CONSTRUCTION.
15.TEMPORARY SOIL STOCKPILES MUST HAVE EFFECTIVE SEDIMENT CONTROL AND CAN NOT BE PLACED IN
SURFACE WATERS OR STORM WATER CONVEYANCE SYSTEMS. TEMPORARY STOCKPILES WITHOUT
SIGNIFICANT AMOUNT OF SILT, CLAY, OR ORGANIC COMPOUNDS ARE EXEPMT EX: CLEAN AGGREGATE
STOCK PILES, DEMOLITION CONCRETE STOCKPILES, SAND STOCKPILES.
16.SEDIMENT CONTROL PRACTICES SHALL BE INSTALLED ON ALL DOWNGRADIENT PERIMETERS AND
UPGRADIENT OF ANY BUFFER ZONES.
17.SEDIMENT LADEN WATER MUST BE DISCHARGED TO A SEDIMENTATION BASIN WHENEVER POSSIBLE. IF
NOT POSSIBLE, IT MUST BE TREATED WITH THE APPROPRIATE BMP'S.
18.SOLID WASTE MUST BE DISPOSED OF PROPERLY AND MUST COMPLY WITH MPCA DISPOSAL
REQUIREMENTS.
19.NO VEHICLE WASHING ALLOWED ON SITE.
20.NO ENGINE DEGREASING IS ALLOWED ON SITE.
21.THE OWNER IS RESPONSIBLE FOR COMPLIANCE WITH ALL TERMS AND CONDITIONS OF THE PERMIT.
THE OPERATOR IS RESPONSIBLE FOR COMPLIANCE WITH SECTIONS 3, 4, 6-22, 24 AND APPLICABLE
REQUIREMENTS FOR CONSTRUCTION ACTIVITY IN SECTION 23.
22.TERMINATION OF COVERAGE-PERMITTEE(S) WISHING TO TERMINATE COVERAGE MUST SUBMIT A
NOTICE OF TERMINATION (NOT) TO THE MPCA. ALL PERMITTEE(S) MUST SUBMIT A NOT WITHIN 30 DAYS
AFTER THE FOLLOWING CONDITIONS HAVE BEEN MET:
A.PERMIT TERMINATION CONDITIONS, PER NPDES PERMIT SECTION 13.1 HAVE BEEN ACHIEVED ON
ALL PORTIONS OF THE SITE FOR WHICH THE PERMITTEE IS RESPONSIBLE.
A.A.PERMANENT UNIFORM PERENNIAL VEGETATIVE COVER MUST BE ESTABLISHED AT 70%
DENSITY OF ITS EXPECTED FINAL GROWTH.
A.B.THE PERMANENT STORMWATER TREATMENT SYSTEM IS CONSTRUCTED, MEETS ALL
REQUIREMENTS, AND IS OPERATING AS DESIGNED.
A.C.ALL TEMPORARY SYNTHETIC EROSION PREVENTION AND SEDIMENT CONTROL BMPS MUST BE
REMOVED.
A.D.CLEAN OUT SEDIMENT FROM CONVEYANCE SYSTEMS AND PERMANENT STORMWATER
TREATMENT SYSTEMS (RETURN TO DESIGN CAPACITY).
23. INSPECTIONS
A.INITIAL INSPECTION FOLLOWING SILT FENCE INSTALLATION BY CITY REPRESENTATIVE IS
REQUIRED.
B.EXPOSED SOIL AREAS: ONCE EVERY 7 DAYS AND WITHIN 24 HOURS FOLLOWING A 0.5" OVER 24
HOUR RAIN EVENT.
C.STABILIZED AREAS: ONCE EVERY 30 DAYS
D.FROZEN GROUND: AS SOON AS RUNOFF OCCURS OR PRIOR TO RESUMING
CONSTRUCTION.
E.INSPECTION AND MAINTENANCE RECORDS MUST BE RETAINED FOR 3 YEARS AFTER FILING OF THE
NOTICE OF TERMINATION AND MUST INCLUDE: DATE AND TIME OF ACTION, NAME OF PERSON(S)
CONDUCTING WORK, FINDING OF INSPECTIONS AND RECOMMENDATIONS FOR CORRECTIVE
ACTION, DATE AND AMOUNT OF RAINFALL EVENTS GREATER THAN 0.5 INCHES IN A 24 HOUR
PERIOD.
F.OBSERVE ANY DISCHARGE OCCURRING ONSITE AND DOCUMENT CORRECTIVE ACTIONS TAKEN.
DISCHARGE SHOULD BE DESCRIBED AND PHOTOGRAPHED.
24. MINIMUM MAINTENANCE
A.ALL NONFUNCTIONAL BMPS MUST BE REPAIRED, REPLACED, OR SUPPLEMENTED WITH
FUNCTIONAL BMPS BY THE END OF THE NEXT BUSINESS DAY AFTER DISCOVERY OR AS SOON AS
FIELD CONDITIONS ALLOW.
B.REPAIR, REPLACE, OR SUPPLEMENT ALL PERIMETER CONTROL DEVICES WHEN THEY BECOME
NONFUNCTIONAL OR THE SEDIMENT REACHES 1
2 THE HEIGHT OF THE DEVICE.
C.SEDIMENT BASINS DRAINED AND SEDIMENT REMOVED WHEN REACHES 1/2 STORAGE VOLUME.
D.SEDIMENT REMOVED FROM SURFACE WATERS WITHIN (7)SEVEN CALENDAR DAYS OF DISCOVERY.
E.CONSTRUCTION SITE EXITS INSPECTED, TRACKED SEDIMENT REMOVED WITHIN (1)ONE CALENDAR
DAY.
F.PROVIDE COPIES OF EROSION INSPECTION RESULTS TO CITY ENGINEER FOR ALL EVENTS GREATER
THAN 12" IN 24 HOURS.
25.THE SWPPP, INCLUDING ALL CHANGES TO IT, AND INSPECTIONS AND MAINTENANCE RECORDS MUST
BE KEPT AT THE SITE DURING CONSTRUCTION ACTIVITY BY THE PERMITTEE(S) WHO HAVE
OPERATIONAL CONTROL OF THE SITE.
26.OWNER MUST KEEP RECORDS OF ALL PERMITS REQUIRED FOR THE PROJECT, THE SWPPP, ALL
INSPECTIONS AND MAINTENANCE, PERMANENT OPERATION AND MAINTENANCE AGREEMENTS, AND
REQUIRED CALCULATIONS FOR TEMPORARY AND PERMANENT STORM WATER MANAGEMENT SYSTEMS.
THESE RECORDS MUST BE RETAINED FOR THREE YEARS AFTER FILING NPDES NOTICE OF TERMINATION.
27.SWPPP MUST BE AMENDED WHEN:
A.THERE IS A CHANGE IN DESIGN, OPERATION, MAINTENANCE, WEATHER OR SEASONAL
CONDITIONS THAT HAS A SIGNIFICANT EFFECT ON DISCHARGE
B.INSPECTIONS INDICATE THAT THE SWPPP IS NOT EFFECTIVE AND DISCHARGE IS EXCEEDING
WATER QUALITY STANDARDS.
C.THE BMP'S IN THE SWPPP ARE NOT CONTROLLING POLLUTANTS IN DISCHARGES OR IS NOT
CONSISTENT WITH THE TERMS AND CONDITIONS OF THE PERMIT.
28.CONCRETE WASHOUT AREA
A.THE WASHOUT AND CLEANOUT OF STUCCO, PAINT, CONCRETE, FORM RELEASE OILS, CURING
COMPOUNDS, AND OTHER CONSTRUCTION MATERIALS SHALL BE PROPERLY CONTAINED AND
DISPOSED OF. THE CONTRACTOR SHALL BE RESPONSIBLE FOR PROVIDING AND USING
APPROVED METHODS OF CONTAINMENT SUCH AS PRE-FABRICATED WASHOUT CONTAINERS,
CONCRETE WASHOUT TOTE, READY MIX TRUCKS WITH SELF-CONTAINED CHUTE CLEANOUT, ETC.
B.ALL SPILLS SHALL BE CLEANED UP IMMEDIATELY.
22.IN THE EVENT OF ENCOUNTERING A WELL OR SPRING DURING CONSTRUCTION CONTRACTOR TO
CEASE CONSTRUCTION ACTIVITY AND NOTIFY ENGINEER.
23.PIPE OULTETS MUST BE PROVIDED WITH TEMPORARY OR PERMANENT ENERGY DISSIPATION WITHIN 24
HOURS AFTER CONNECTION TO A SURFACE WATER.
24.FINAL STABILIZATION
FINAL STABILIZATION REQUIRES THAT ALL SOIL DISTURBING ACVTIVITIES HAVE BEEN COMPLETED AND
THAT DISTURBED AREAS ARE STABILIZED BY A UNIFORM PERENNIAL VEGETATIVE COVER WITH 70% OF
THE EXPECTED FINAL DENSITY, AND THAT ALL PERMANENT PAVEMENTS HAVE BEEN INSTALLED. ALL
TEMPORARY BMP'S SHALL BE REMOVED, DITCHES STABILIZED, AND SEDIMENT SHALL BE REMOVED
FROM PERMANENT CONVEYANCES AND SEDIMENTATION BASINS IN ORDER TO RETURN THE POND TO
DESIGN CAPACITY.
25.RESPONSIBILITIES
A.THE OWNER MUST IDENTIFY A PERSON WHO WILL OVERSEE THE SWPPP IMPLEMENTATION AND
THE PERSON RESPONSIBLE FOR INSPECTION AND MAINTENANCE:
CONTACT:TBD
COMPANY:TBD
PHONE: TBD
B.THE OWNER MUST IDENTIFY THE A PERSON WHO WILL BE RESPONSIBLE FOR LONG TERM
OPERATIONS AND MAINTENANCE OF THE PERMANENT STORMWATER MANAGEMENT SYSTEM:
CONTACT:TBD
COMPANY: TBD
PHONE: TBD
33.THE WATERSHED DISTRICT OR THE CITY MAY HAVE REQUIREMENTS FOR INSPECTIONS OR AS-BUILT
DRAWINGS VERIFYING PROPER CONSTRUCTION OF THE BMPS.
34.EROSION CONTROL DEVICES CANNOT BE REMOVED UNTIL THE WATERSHED DISTRICT HAS
DETERMINED THE SITE HAS BEEN PERMANENTLY RESTABALIZED AND SHALL BE REMOVED WITHIN 30
DAYS THEREAFTER.