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Project
<br />Location
<br />Date Submittal / RevisionNo.
<br />Certification
<br />Sheet Title
<br />Summary
<br />Revision History
<br />Sheet No.Revision
<br />Project No.
<br />By
<br />Designed:Drawn:
<br />Approved:Book / Page:
<br />Phase:Initial Issue:
<br />Client
<br />GORDON
<br />JAMES
<br />CONSTRUCTION
<br />5159 MAIN STREET SUITE 200
<br />MAPLE PLAIN, MN 55359
<br />ORCHARD
<br />CREEK
<br />ORONO, MN
<br />JEB CJS
<br />ETL
<br />FINAL 04/22/2020
<br />20658.03
<br />Registration No.Date:
<br />I hereby certify that this plan, specification or
<br />report was prepared by me or under my direct
<br />supervision and that I am a duly licensed
<br />professional ENGINEER under the laws of the state
<br />of Minnesota.
<br />If applicable, contact us for a wet signed copy of this
<br />plan which is available upon request at Sambatek's,
<br />Minnetonka, MN office.
<br />04/22/202050475
<br />Eric T. Luth
<br />04/22/20 City Submittal
<br />05/01/20 MCWD Submittal
<br />05/04/20 City Resubmittal
<br />07/22/20 City Resubmittal
<br />04/01/21 Final Plat
<br />05/19/21 Final Plat City Comments
<br />06/09/21 Stormwater Basin Update
<br /> Jun 09, 2021 - 2:38pm - User:jbalzer L:\PROJECTS\20658.03\CAD\Civil\Sheets\20658.03-C4-GRADE.dwg
<br />C4.03
<br />GRADING
<br />NOTES
<br />1.PROPOSED CONTOURS ARE TO FINISHED SURFACE ELEVATION. SPOT ELEVATIONS ALONG PROPOSED CURB DENOTE
<br />GUTTER GRADE.
<br />2.CONTRACTOR SHALL REVIEW PAVEMENT GRADIENT AND CONSTRUCT “GUTTER OUT” WHERE WATER DRAINS AWAY
<br />FROM CURB. ALL OTHER AREAS SHALL BE CONSTRUCTED AS “GUTTER IN” CURB.
<br />3.ALL GRADIENT ON SIDEWALKS ALONG THE ADA ROUTE SHALL HAVE A MAXIMUM LONGITUDINAL SLOPE OF 5% (1:20),
<br />EXCEPT AT CURB RAMPS (1:12), AND A MAXIMUM CROSS SLOPE OF 2.08% (1:48). MAXIMUM SLOPE IN ANY DIRECTION
<br />ON AN ADA PARKING STALL OR ACCESS AISLE SHALL BE IN 2.08% (1:48). CONTRACTOR SHALL REVIEW AND VERIFY THE
<br />GRADIENT IN THE FIELD ALONG THE ADA ROUTES PRIOR TO PLACING CONCRETE OR BITUMINOUS. CONTRACTOR SHALL
<br />NOTIFY THE ENGINEER IMMEDIATELY IF THERE IS A DISCREPANCY BETWEEN THE GRADIENT IN THE FIELD VERSUS THE
<br />DESIGN GRADIENT. COORDINATE ALL WORK WITH PAVING CONTRACTOR.
<br />4.CONTRACTOR SHALL TAKE ALL PRECAUTIONS NECESSARY TO AVOID PROPERTY DAMAGE TO ADJACENT PROPERTIES
<br />DURING THE CONSTRUCTION PHASES OF THIS PROJECT. CONTRACTOR WILL BE HELD SOLELY RESPONSIBLE FOR ANY
<br />DAMAGES TO THE ADJACENT PROPERTIES OCCURRING DURING THE CONSTRUCTION PHASES OF THIS PROJECT.
<br />5.SAFETY NOTICE TO CONTRACTORS: IN ACCORDANCE WITH GENERALLY ACCEPTED CONSTRUCTION PRACTICES,
<br />CONTRACTOR WILL BE SOLELY AND COMPLETELY RESPONSIBLE FOR CONDITIONS ON THE JOB SITE, INCLUDING SAFETY
<br />OF ALL PERSONS AND PROPERTY DURING PERFORMANCE OF THE WORK. THIS REQUIREMENT WILL APPLY
<br />CONTINUOUSLY AND NOT BE LIMITED TO NORMAL WORKING HOURS. THE DUTY OF THE ENGINEER OR THE DEVELOPER
<br />TO CONDUCT CONSTRUCTION REVIEW OF THE CONTRACTOR'S PERFORMANCE IS NOT INTENDED TO INCLUDE REVIEW
<br />OF THE ADEQUACY OF THE CONTRACTOR'S SAFETY MEASURES IN, ON OR NEAR THE CONSTRUCTION SITE.
<br />6.CONTRACTOR SHALL COMPLETE THE SITE GRADING CONSTRUCTION IN ACCORDANCE WITH THE REQUIREMENTS OF THE
<br />OWNER'S SOILS ENGINEER. ALL SOIL TESTING SHALL BE COMPLETED BY THE OWNER'S SOILS ENGINEER. CONTRACTOR
<br />SHALL BE RESPONSIBLE FOR COORDINATING ALL REQUIRED SOIL TESTS AND INSPECTIONS WITH THE SOILS ENGINEER.
<br />A GEOTECHNICAL ENGINEERING SOILS REPORT HAS BEEN COMPLETED BY:
<br />COMPANY: BRAUN INTERTEC
<br />ADDRESS: 11001 HAMPSHIRE AVE S, MPLS, MN 55438
<br />PHONE: 952-995-2000
<br />DATED: JANUARY 16, 2020
<br />CONTRACTOR SHALL OBTAIN A COPY OF THE SOILS REPORT.
<br />7.CONTRACTOR SHALL COMPLETE DEWATERING AS REQUIRED TO COMPLETE THE SITE GRADING CONSTRUCTION.
<br />8.PRIOR TO PLACEMENT OF THE AGGREGATE BASE, A TEST ROLL SHALL BE PERFORMED ON THE STREET AND PARKING
<br />AREA SUBGRADE. CONTRACTOR SHALL PROVIDE A LOADED TANDEM AXLE TRUCK WITH A GROSS WEIGHT OF 25 TONS.
<br />THE TEST ROLLING SHALL BE AT THE DIRECTION OF THE SOILS ENGINEER AND SHALL BE COMPLETED IN AREAS AS
<br />DIRECTED BY THE SOILS ENGINEER. CORRECTION OF THE SUBGRADE SOILS SHALL BE COMPLETED IN ACCORDANCE WITH
<br />THE REQUIREMENTS OF THE SOILS ENGINEER.
<br />9.REPLACE ALL SUBGRADE SOIL DISTURBED DURING THE CONSTRUCTION THAT HAVE BECOME UNSUITABLE AND WILL NOT
<br />PASS A TEST ROLL. REMOVE UNSUITABLE SOIL FROM THE SITE AND IMPORT SUITABLE SOIL AT NO ADDITIONAL COST TO
<br />THE OWNER.
<br />10.CONTRACTOR SHALL BE RESPONSIBLE FOR PROVIDING AND MAINTAINING VEHICULAR AND PEDESTRIAN TRAFFIC
<br />CONTROL DEVICES SUCH AS BARRICADES, WARNING SIGNS, DIRECTIONAL SIGNS, FLAGMEN AND LIGHTS TO CONTROL
<br />THE MOVEMENT OF TRAFFIC WHERE NECESSARY. TRAFFIC CONTROL DEVICES SHALL CONFORM TO APPROPRIATE
<br />MINNESOTA DEPARTMENT OF TRANSPORTATION STANDARDS.
<br />11.EXISTING TREES AND OTHER NATURAL VEGETATION WITHIN THE PROJECT AND/OR ADJACENT TO THE PROJECT ARE OF
<br />PRIME CONCERN TO THE CONTRACTOR'S OPERATIONS AND SHALL BE A RESTRICTED AREA. CONTRACTOR SHALL
<br />PROTECT TREES TO REMAIN AT ALL TIMES. EQUIPMENT SHALL NOT NEEDLESSLY BE OPERATED UNDER NEARBY TREES
<br />AND EXTREME CAUTION SHALL BE EXERCISED WHEN WORKING ADJACENT TO TREES. SHOULD ANY PORTION OF THE
<br />TREE BRANCHES REQUIRE REMOVAL TO PERMIT OPERATION OF THE CONTRACTOR'S EQUIPMENT, CONTRACTOR SHALL
<br />OBTAIN THE SERVICES OF A PROFESSIONAL TREE TRIMMING SERVICE TO TRIM THE TREES PRIOR TO THE BEGINNING OF
<br />OPERATION. SHOULD CONTRACTOR'S OPERATIONS RESULT IN THE BREAKING OF ANY LIMBS, THE BROKEN LIMBS
<br />SHOULD BE REMOVED IMMEDIATELY AND CUTS SHALL BE PROPERLY PROTECTED TO MINIMIZE ANY LASTING DAMAGE
<br />TO THE TREE. NO TREES SHALL BE REMOVED WITHOUT AUTHORIZATION BY THE ENGINEER. COSTS FOR TRIMMING
<br />SERVICES SHALL BE CONSIDERED INCIDENTAL TO THE GRADING CONSTRUCTION AND NO SPECIAL PAYMENT WILL BE
<br />MADE.
<br />11.a.RESTRICTED AREAS SHALL INCLUDE ALL DESIGNATED TREED AREAS OUTSIDE OF THE DESIGNATED
<br />CONSTRUCTION ZONE. ALL VEGETATION WITHIN THE RESTRICTED AREAS SHALL REMAIN.
<br />11.b.CONTRACTOR SHALL RESTRICT ALL GRADING AND CONSTRUCTION ACTIVITIES TO AREAS DESIGNATED ON THE
<br />PLANS. ACTIVITIES WITHIN THE CONSTRUCTION MAY BE RESTRICTED TO A NARROWER WIDTH IN THE FIELD TO
<br />SAVE ADDITIONAL TREES AS DIRECTED BY THE OWNER.
<br />11.c.ACTIVITIES PROHIBITED OUTSIDE OF THE CONSTRUCTION BOUNDARIES WOULD INCLUDE, BUT NOT BE LIMITED
<br />TO: SOIL AND OTHER MATERIAL STOCKPILING, EQUIPMENT OR MACHINERY STORAGE, DRIVING OF ANY
<br />VEHICLE, LEAKAGE OR SPILLAGE OF ANY “WASHOUT” OR OTHER TOXIC MATERIAL. THE COLLECTION OF OTHER
<br />DEBRIS AND SOIL STOCKPILING WILL BE IN AN AREA DETERMINED ON-SITE BY THE ENGINEER.
<br />11.d.ALL RESTRICTED AREAS SHALL BE FENCED OFF WITH BRIGHT ORANGE POLYETHYLENE SAFETY NETTING AND
<br />STEEL STAKES AS SHOWN ON THE TREE PROTECTION DETAIL. AT NO TIME SHALL THIS FENCING BE REMOVED OR
<br />ACTIVITY OF ANY KIND TAKE PLACE WITHIN IT. FINAL PLACEMENT OF ALL PROTECTIVE FENCING SHALL BE
<br />COMPLETE BEFORE ANY WORK COMMENCES ON-SITE.
<br />11.e.BEFORE COMMENCING WITH ANY EXCAVATION CONTRACTOR SHALL COMPLETE ALL PREPARATORY WORK
<br />REGARDING TREE REMOVAL, ROOT PRUNING, TREE PRUNING AND STUMP REMOVAL TO THE SATISFACTION OF
<br />THE OWNER.
<br />11.f.PREPARATORY WORK SHALL INCLUDE THE FOLLOWING AND SHALL BE COMPLETED UNDER THE DIRECT
<br />SUPERVISION OF THE OWNER'S REPRESENTATIVE:
<br />11.f.a.TREE REMOVAL: CONTRACTOR SHALL FELL THE TREES. AT NO TIME SHALL TREES BE BULLDOZED OUT, BUT
<br />SHALL BE CUT DOWN AND STUMPS REMOVED SEPARATELY. PRIOR TO THE FELLING OF ALL TREES, PROPER
<br />REMOVAL OF A PORTION OR ALL OF THE CANOPY SHALL BE COMPLETED SO THAT TREES IN THE RESTRICTED
<br />AREAS SHALL NOT BE INJURED IN THE PROCESS.
<br />11.f.b.ROOT PRUNING: BEFORE ANY STUMPS ARE TO BE REMOVED, ALL ROOTS SHALL BE SEVERED FROM ROOTS IN
<br />THE RESTRICTED AREAS BY SAW CUTTING WITH A VERMEER DESIGNED FOR ROOT PRUNING, BY HAND, OR
<br />WITH A CHAINSAW. TREE ROOTS PROJECTING INTO THE CONSTRUCTION ZONE SHALL BE EXPOSED PRIOR TO
<br />ROOT PRUNING WITH SMALL MACHINERY, I.E..., BOBCAT.
<br />11.f.c.STUMP REMOVAL: AT SUCH TIME THAT ROOTS HAVE BEEN PROPERLY SEVERED, STUMPS MAY BE REMOVED.
<br />WHERE REMOVAL OF CERTAIN STUMPS COULD CAUSE DAMAGE TO EXISTING PROTECTED TREES, TREE
<br />STUMPS SHALL BE GROUND OUT. ALL STUMP REMOVAL SHALL BE UNDER THE DIRECT SUPERVISION OF THE
<br />OWNER'S REPRESENTATIVE.
<br />11.f.d.TREE PRUNING: PROPER PRUNING OF TREES IN THE RESTRICTED ZONE SHALL BE DIRECTED BY AND
<br />SUPERVISION AT ALL TIMES BY THE OWNER'S REPRESENTATIVE.
<br />11.g.AN OWNER'S REPRESENTATIVE WILL BE AVAILABLE AT ALL TIMES DURING THE PREPARATORY AND
<br />CONSTRUCTION PERIOD.
<br />11.h.MULCH RATHER THAN SEED OR SOD WILL BE USED AT THE BASE OF QUALITY TREES TO A PERIMETER
<br />DETERMINED BY THE OWNER'S REPRESENTATIVE. AREAS TO BE SEEDED FOR EROSION CONTROL PURPOSES
<br />WITHIN THE CONSTRUCTION ZONE ARE TO BE DETERMINED BY THE OWNER'S REPRESENTATIVE. NATURAL
<br />GROUND COVER WILL BE MAINTAINED WHEREVER POSSIBLE.
<br />11.i.THE USE OF RETAINING WALLS NEAR TREES, IN ADDITION TO THOSE REQUIRED ON THE PLANS SHALL BE
<br />DETERMINED IN THE FIELD, BASED ON TREE LOCATIONS AND TOPOGRAPHY.
<br />12.EXCAVATE TOPSOIL FROM AREAS TO BE FURTHER EXCAVATED OR REGRADED AND STOCKPILE IN AREAS DESIGNATED ON
<br />THE SITE. CONTRACTOR SHALL SALVAGE ENOUGH TOPSOIL FOR RESPREADING ON THE SITE AS SPECIFIED. EXCESS
<br />TOPSOIL SHALL BE PLACED IN EMBANKMENT AREAS, OUTSIDE OF BUILDING PADS, ROADWAYS AND PARKING AREAS.
<br />CONTRACTOR SHALL SUBCUT CUT AREAS, WHERE TURF IS TO BE ESTABLISHED, TO A DEPTH OF 6 INCHES. RESPREAD
<br />TOPSOIL IN AREAS WHERE TURF IS TO BE ESTABLISHED TO A MINIMUM DEPTH OF 6 INCHES.
<br />13.TRENCH BORROW CONSTRUCTION: IF ALLOWED BY THE OWNER, CONTRACTOR SHALL COMPLETE “TRENCH
<br />BORROW” EXCAVATION IN AREAS DIRECTED BY THE ENGINEER IN ORDER TO OBTAIN STRUCTURAL MATERIAL. TREES
<br />SHALL NOT BE REMOVED OR DAMAGED AS A RESULT OF THE EXCAVATION, UNLESS APPROVED BY THE ENGINEER. THE
<br />EXCAVATION SHALL COMMENCE A MINIMUM OF 10 FEET FROM THE LIMIT OF THE BUILDING PAD. THE EXCAVATION
<br />FROM THIS LIMIT SHALL EXTEND AT A MINIMUM SLOPE OF 1 FOOT HORIZONTAL TO 1 FOOT VERTICAL (1:1) DOWNWARD
<br />AND OUTWARD FROM THE FINISHED SURFACE GRADE ELEVATION. THE TRENCH BORROW EXCAVATION SHALL BE
<br />BACKFILLED TO THE PROPOSED FINISHED GRADE ELEVATION, AND SHALL BE COMPACTED IN ACCORDANCE WITH
<br />REQUIREMENTS OF THE QUALITY COMPACTION METHOD AS OUTLINED IN MN/DOT SPECIFICATION 2105.3F2. SNOW
<br />FENCE SHALL BE FURNISHED AND PLACED ALONG THE PERIMETER OF THE TRENCH BORROW AREA WHERE THE SLOPES
<br />EXCEED 2 FOOT HORIZONTAL TO 1 FOOT VERTICAL (2:1).
<br />14.FINISHED GRADING SHALL BE COMPLETED, CONTRACTOR SHALL UNIFORMLY GRADE AREAS WITHIN LIMITS OF GRADING,
<br />INCLUDING ADJACENT TRANSITION AREAS. PROVIDE A SMOOTH FINISHED SURFACE WITHIN SPECIFIED TOLERANCES,
<br />WITH UNIFORM LEVELS OR SLOPES BETWEEN POINTS WHERE ELEVATIONS ARE SHOWN, OR BETWEEN SUCH POINTS AND
<br />EXISTING GRADES. AREAS THAT HAVE BEEN FINISHED GRADED SHALL BE PROTECTED FROM SUBSEQUENT
<br />CONSTRUCTION OPERATIONS, TRAFFIC AND EROSION. REPAIR ALL AREAS THAT HAVE BECOME RUTTED, ERODED OR HAS
<br />SETTLED BELOW THE CORRECT GRADE. ALL AREAS DISTURBED BY THE CONTRACTOR'S OPERATIONS SHALL BE RESTORED
<br />TO EQUAL OR BETTER THAN ORIGINAL CONDITION OR TO THE REQUIREMENTS OF THE NEW WORK.
<br />15.TOLERANCES
<br />15.a.THE RESIDENTIAL BUILDING SUBGRADE FINISHED SURFACE ELEVATION SHALL NOT VARY BY MORE THAN 0.30
<br />FOOT ABOVE, OR 0.30 FOOT BELOW, THE PRESCRIBED ELEVATION AT ANY POINT WHERE MEASUREMENT IS
<br />MADE.
<br />15.b.THE COMMERCIAL BUILDING SUBGRADE FINISHED SURFACE ELEVATION SHALL NOT VARY BY MORE THAN 0.10
<br />FOOT ABOVE, OR 0.10 FOOT BELOW, THE PRESCRIBED ELEVATION AT ANY POINT WHERE MEASUREMENT IS
<br />MADE.
<br />15.c.THE STREET OR PARKING AREA SUBGRADE FINISHED SURFACE ELEVATION SHALL NOT VARY BY MORE THAN 0.05
<br />FOOT ABOVE, OR 0.10 FOOT BELOW, THE PRESCRIBED ELEVATION OF ANY POINT WHERE MEASUREMENT IS
<br />MADE.
<br />15.d.AREAS WHICH ARE TO RECEIVE TOPSOIL SHALL BE GRADED TO WITHIN 0.30 FOOT ABOVE OR BELOW THE
<br />REQUIRED ELEVATION, UNLESS DIRECTED OTHERWISE BY THE ENGINEER.
<br />15.e.TOPSOIL SHALL BE GRADED TO PLUS OR MINUS 1/2 INCH OF THE SPECIFIED THICKNESS.
<br />16.AFTER THE SITE GRADING IS COMPLETED, IF EXCESS OR SHORTAGE OF SOIL MATERIAL EXISTS, CONTRACTOR SHALL
<br />TRANSPORT ALL EXCESS SOIL MATERIAL OFF THE SITE TO AN AREA SELECTED BY THE CONTRACTOR, OR IMPORT
<br />SUITABLE MATERIAL TO THE SITE.
<br />17.CONTRACTOR SHALL DETERMINE THE LOCATION OF ANY HAUL ROADS THAT MAY BE REQUIRED TO COMPLETE THE SITE
<br />GRADING CONSTRUCTION AND SHALL INDICATE HAUL ROADS ON EROSION AND SEDIMENT CONTROL “SITE
<br />MAP”. CONTRACTOR SHALL COMPLY WITH THE REQUIREMENTS OF THE GOVERNING AUTHORITY OF EACH
<br />ROADWAY. CONTRACTOR SHALL POST WHATEVER SECURITY, AND COMPLY WITH ALL CONDITIONS WHICH ARE
<br />REQUIRED BY EACH GOVERNING AUTHORITY OF EACH ROADWAY.
<br />18.DISTURBED AREAS WITHIN WETLAND MITIGATION SITE AND ANY DISTURBED AREAS WITHIN THE WETLAND SHALL BE
<br />RESTORED WITH 6 TO 12 INCHES OF ORGANIC SOILS, PREFERABLY SOILS THAT WERE PREVIOUSLY REMOVED FROM
<br />WETLAND AREAS. SEEDING IN THE WETLAND MITIGATION AREAS ABOVE THE NORMAL WATER LEVEL SHALL BE MN
<br />STATE SEED MIX 34-271, WET MEADOW SOUTH AND WEST, OR APPROVED EQUAL. FOR STATE SEED MIXES, OATS AND
<br />WINTER WHEAT SHOULD BE SELECTED BASED ON THE TIME OF YEAR THAT THE MIX IS BEING USED. OATS SHOULD BE
<br />INCLUDED IN MIXES IF BEING USED BETWEEN OCTOBER 15TH AND AUGUST 1ST. WINTER WHEAT SHOULD BE USED
<br />BETWEEN AUGUST 1ST AND OCTOBER 15TH. THE SEEDING RATE IS THE SAME FOR OATS AND WINTER WHEAT. MIX
<br />34-271 SHOULD BE APPLIED AT 12 POUNDS PER ACRE. SEED SHALL BE WATERED UNTIL A HEALTHY STAND OF
<br />VEGETATION IS OBTAINED.
<br />19.FILL PLACED WITHIN THE BUILDING PAD AREAS SHALL BE IN CONFORMANCE WITH HUD/FHA PROCEDURES AND DATA
<br />SHEET 79G.
<br />GRADING NOTES
<br />1.FILTRATION BASIN CONSTRUCTION REQUIREMENTS:
<br />(INCLUDES ALL DEVICES USING FILTRATION THROUGH A SOIL MEDIUM TO CAPTURE STORM WATER RUNOFF BUT ARE
<br />NOT LIMITED TO: INFILTRATION BASINS, INFILTRATION TRENCHES, BIOFILTRATION BASINS, RAINWATER GARDENS, SAND
<br />FILTERS, ORGANIC FILTERS, BIORETENTION AREAS, ENHANCED SWALES, DRY STORAGE PONDS WITH UNDERDRAIN
<br />DISCHARGE, AND NATURAL DEPRESSIONS (IF USED TO PROVIDE STORMWATER TREATMENT OF NEW IMPERIOUS
<br />SURFACE))
<br />1.a.PERMITTEES MUST NOT EXCAVATE INFILTRATION SYSTEMS TO FINAL GRADE, OR WITHIN THREE (3) FEET OF
<br />FINAL GRADE, UNTIL THE CONTRIBUTING DRAINAGE AREA HAS BEEN CONSTRUCTED AND FULLY STABILIZED
<br />UNLESS THEY PROVIDE RIGOROUS EROSION PREVENTION AND SEDIMENT CONTROLS (E.G., DIVERSION BERMS)
<br />TO KEEP SEDIMENT AND RUNOFF COMPLETELY AWAY FROM THE INFILTRATION AREA. WHEN EXCAVATING AN
<br />INFILTRATION SYSTEM TO WITHIN THREE (3) FEET OF FINAL GRADE, PERMITTEES MUST STAKE OFF AND MARK
<br />THE AREA SO HEAVY CONSTRUCTION VEHICLES OR EQUIPMENT DO NOT COMPACT THE SOIL IN THE
<br />INFILTRATION AREA. ONCE STREET AND UTILITY CONSTRUCTION CEASES AND “FINAL STABILIZATION” (AS
<br />DEFINED ACCORDING TO SECTION 8 OF THE SWPPP NARRATIVE) OF CONTRIBUTING DRAINAGE AREA HAS BEEN
<br />COMPLETED, AND ONLY AFTER THE OWNER'S ENGINEER AUTHORIZES CONTRACTOR TO PROCEED, INFILTRATION
<br />BASIN SHALL BE EXCAVATED TO FINISHED GRADE.
<br />1.b.HEAVY EQUIPMENT SHALL NOT TRAVEL WITHIN THE INFILTRATION BASIN AREA. EXCAVATION WITHIN THE
<br />INFILTRATION BASIN SHALL BE PERFORMED BY USE OF A BACKHOE BUCKET WITH TEETH. CONTRACTOR SHALL
<br />DISC OR TILL THE SOILS IF REQUIRED BY THE SOILS ENGINEER.
<br />1.c.INFILTRATION BASIN SHALL BE PROTECTED BY SILT FENCE DURING ALL CONSTRUCTION ACTIVITIES. ALL
<br />DEPOSITED SEDIMENT DURING CONSTRUCTION ACTIVITY SHALL BE PROPERLY DISPOSED OF DOWNSTREAM OF
<br />INFILTRATION BASIN, IF POSSIBLE.
<br />1.d.ALL FLARED END SECTION INLETS AND CATCH BASIN MANHOLE INLETS SHALL HAVE INLET EROSION CONTROL
<br />PROTECTION IN PLACE UNTIL FINAL STABILIZATION BASIN HAS OCCURRED.
<br />1.e.ABOVE THE INFILTRATION BASIN OUTLET ELEVATION, INCLUDING THE BERM AND DISTURBED AREAS, A
<br />MINIMUM OF 4" DEPTH OF TOPSOIL MATERIAL SHALL BE PLACED TO THE FINISHED GRADE ELEVATION. TOPSOIL
<br />SHALL MEET (MN/DOT) SPECIFICATION. THE AREA SHALL BE SEEDED WITH MN STATE SEED MIXTURE 25-131
<br />(LOW MAINTENANCE TURF) APPLIED AT A RATE OF 220 LBS/ACRE, OR MN STATE SEED MIXTURE 35-241 (MESIC
<br />PRAIRIE GENERAL) APPLIED AT A RATE OF 36.5 LBS/ACRE. SOD MEETING (MN/DOT) SPECIFICATION 3878.2-B CAN
<br />BE SUBSTITUTED FOR SEED.
<br />SEED APPLICATION PROCEDURE:
<br />MIXTURE APPLICATION PROCEDURES SHALL FOLLOW (MN/DOT) SPECIFICATION 2575.3. SEED SHALL BE SECURED
<br />BY USE OF (MN/DOT) SPECIFICATION 3885 CATEGORY 1 EROSION BLANKET.
<br />ABSENT A SOIL TEST, FERTILIZER MEETING ANALYSIS 22-5-10 (NPK) 80% W.I.N. SHALL BE APPLIED AT A RATE OF
<br />350 LBS/ACRE FOR SEED MIXTURE 25-131, OR FERTILIZER WITH AN ANALYSIS OF 18-1-8 (NPK) (FOR LOAMS, CLAY
<br />LOAM SOIL), OR 17-10-7 (NPK) (FOR SANDS WITH LESS THAN 30% ORGANIC AND CLAY MATTER) NATURAL BASE
<br />SHALL BE APPLIED AT A RATE OF 150 LBS/ACRE FOR SEED MIXTURE 35-241.
<br />1.f.BELOW THE INFILTRATION BASIN OUTLET, INCLUDING BASIN FLOOR, PLACE PLANTING MEDIUM SOIL BASED ON -
<br />SITE SOIL CONDITIONS, AND ALSO BASED ON LANDSCAPE ARCHITECT, WATERSHED, AND/OR CITY
<br />RECOMMENDATIONS (SEE DETAIL ON PLAN). DISTURBED AREAS TO BE SEEDED WITH MN STATE SEED MIXTURE
<br />33-261 (STORMWATER SOUTH AND WEST) APPLIED AT A RATE OF 35 LBS/ACRE. DRAINTILE INSTALLATION (IF
<br />REQUIRED) SHALL BE INSTALLED CONCURRENTLY WITH FLOOR CONSTRUCTION.
<br />NOTE: INFILTRATION BASIN FLOOR EXCAVATING, PLANTING MEDIUM SOIL PLACEMENT, DRAINTILE
<br />INSTALLATION, ETC. SHALL TAKE PLACE ONLY AFTER THE OWNER'S ENGINEER AUTHORIZES CONTRACTOR TO
<br />PROCEED AND AFTER INFILTRATION BASIN SIDESLOPES (ABOVE OUTLET ELEVATION) HAVE UNDERGONE “FINAL
<br />STABILIZATION” WHICH INCLUDES FLUSHING OUT ACCUMULATED SILT AND SEDIMENT FROM CONTRIBUTING
<br />STORM SEWER. EXCAVATED BASIN MATERIAL SHALL BE DISPOSED OF DOWNSTREAM OF BASIN AREA, IF
<br />POSSIBLE, OR OFF-SITE.
<br />SEED APPLICATION PROCEDURE:
<br />MIXTURE APPLICATION PROCEDURES SHALL FOLLOW (MN/DOT) SPECIFICATION 2575.3. SEED SHALL BE
<br />SECURED BY USE OF HYDRO MULCH, OR SECURED BY (MN/DOT) SPECIFICATION 3885 CATEGORY 1 OR CATEGORY
<br />3 EROSION BLANKET. ABSENT A SOIL TEST, FERTILIZER WITH AN ANALYSIS OF 18-1-8 (NPK) (FOR LOAMS, CLAY
<br />LOAM SOIL), OR 17-10-7 (NPK) (FOR SANDS WITH LESS THAN 30% ORGANIC AND CLAY MATTER), NATURAL BASE
<br />SHALL BE APPLIED AT A RATE OF 120 LBS/ACRE.
<br />1.g.CONTRACTOR SHALL RESEED OR REPLANT ANY AREAS ON WHICH THE ORIGINAL SEED HAS FAILED TO
<br />GERMINATE AS DIRECTED BY THE OWNER'S ENGINEER.
<br />1.h.IF ALTERNATIVE METHODS OF INFILTRATION BASIN CONSTRUCTION ARE PROPOSED BY THE CONTRACTOR,
<br />THOSE ALTERNATIVE METHODS WILL REQUIRE WRITTEN APPROVAL BY THE OWNER'S ENGINEER.
<br />1.i.COSTS FOR REMOBILIZATION (IF REQUIRED) TO COMPLETE INFILTRATION BASIN CONSTRUCTION WILL BE
<br />CONDUCTED AT THE CONTRACTOR'S EXPENSE.
<br />2.PERFORMANCE TESTING OF INFILTRATION BASINS:
<br />(TO BE CONDUCTED IF DESIGN INFILTRATION RATE WAS VERIFIED ACCORDING TO ASTM D-3385-03 "STANDARD TEST
<br />METHOD FOR INFILTRATION RATE OF SOILS IN FIELD USING DOUBLE-RING INFILTROMETER".)
<br />ALL COSTS RELATED TO THE PERFORMANCE INFILTRATION TESTING SHALL BE PAID BY THE OWNER, EXCEPT AS NOTED.
<br />THE INFILTRATION BASINS WILL BE TESTED IN ACCORDANCE TO THE FOLLOWING PROCEDURE:
<br />2.a.A MINIMUM OF TWO INFILTRATION TESTS SHALL BE COMPLETED FOR EACH INFILTRATION BASIN (0.5 ACRE
<br />FLOOR AREA OR LESS). THE REQUIRED NUMBER OF TESTS SHALL BE VERIFIED WITH THE SOILS ENGINEER AND
<br />THE GOVERNING AUTHORITIES.
<br />2.b.TWO ADDITIONAL TESTS WILL BE REQUIRED FOR EACH 0.5 ACRE OF INFILTRATION BASIN FLOOR AREA.
<br />2.c.TEST PROCEDURE WILL FOLLOW ASTM D-3385-09 "STANDARD TEST METHOD FOR INFILTRATION RATE OF SOILS
<br />IN FIELD USING DOUBLE-RING INFILTROMETER".
<br />2.d.TEST WILL BE CONDUCTED AT THE FINISHED BASIN FLOOR ELEVATION.
<br />2.e.TEST WILL BE FOR A PERIOD AS OUTLINED IN ASTM D-3385-09.
<br />2.f.THE TEST RESULTS WILL BE AVERAGED TO OBTAIN THE INFILTRATION RATE USED FOR ACCEPTANCE.
<br />2.g.THE LOWEST MEASURED INFILTRATION RATE SHALL EXCEED THE DESIGN INFILTRATION RATE OF 0.2
<br />INCHES/HOUR.
<br />2.h.THE AVERAGE OF THE MEASURED INFILTRATION RATES MUST MEET OR EXCEED THE DESIGN RATE OF 0.2
<br />INCHES/HOUR DIVIDED BY THE CORRECTION FACTOR USED IN CALCULATING THE DESIGN RATE AS NOTED IN
<br />TABLE 12.INF.8 FROM THE LATEST EDITION OF THE MINNESOTA STORMWATER MANUAL.
<br />IF THE INFILTRATION RATE AS TESTED DOES NOT MEET OR EXCEED THE REQUIRED RATE AS DETERMINED ABOVE,
<br />CONTRACTOR WILL BE REQUIRED TO COMPLETE SOIL CORRECTIVE AND/OR SOIL REPLACEMENT WORK AS
<br />NECESSARY WITHIN THE INFILTRATION BASIN AREA AT THE CONTRACTOR'S EXPENSE UNTIL THE INFILTRATION
<br />RATE AS TESTED EXCEEDS THE REQUIRED RATE AS DETERMINED ABOVE. SUBSEQUENT RE-TESTING WILL BE
<br />REQUIRED UNTIL THE INFILTRATION AS TESTED EXCEEDS THE REQUIRED RATE AS DETERMINED ABOVE.
<br />RE-TESTING SHALL BE AT THE CONTRACTOR'S EXPENSE AND WILL BE DEDUCTED FROM THE AMOUNT DUE THE
<br />CONTRACTOR.
<br />FILTRATION BASIN CONSTRUCTION NOTES
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