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917918919920
<br />920921
<br />921922
<br />922923924925926927928929
<br />929930
<br />930
<br />931
<br />931 932932 933933
<br />933 93493530.029.632.633.019.6 ME28.3 ME35.9 ME32.6 ME30.6 ME26.6 ME26.6 ME26.6 ME19.6 ME19.6 ME29.6 ME29.5 ME29.2 ME29.0 ME29.3 ME29.5 ME29.1 ME28.9 ME29.8 ME28.8 ME28.5 ME29.7 ME16.6 ME16.2 ME19.7 ME19.7 ME19.7 ME19.319.118.818.429.5 ME32.9 ME33.0 ME33.1 ME33.2 ME33.0 ME33.2 ME33.2 ME33.2 ME32.7 ME33.2 MEPROPOSED FOOTBALL /LACROSSE FIELD(180' X 360')A1C2.111C2.111C2.111C2.111C2.111C2.111C2.111C2.11SILT FENCE = 5,050 L.F.SEDIMENT CONTROL LOG = 720 L.F.ROCK CONSTRUCTION ENTRANCE = 75 C.Y.SEDIMENT CONTROL DEVICE AT STORM SEWER INLET = 48APPROXIMATE EROSION CONTROL DEVICEQUANTITIES1. REFER TO SHEET C1.34, GRADING AND DRAINAGE PLAN FIELD, FOR GENERAL NOTES.2. REFER TO SWPPP NARRATIVE (SECTION 01 89 13) FOR CONSTRUCTION SEQUENCING ANDEROSION CONTROL REQUIREMENTS.3. MAINTAIN ADJACENT PROPERTY AND PUBLIC STREETS CLEAN FROM CONSTRUCTION CAUSEDDIRT AND DEBRIS ON A DAILY BASIS. PROTECT DRAINAGE SYSTEMS FROM SEDIMENTATIONAS A RESULT OF CONSTRUCTION RELATED DIRT AND DEBRIS.4. MAINTAIN DUST CONTROL DURING GRADING OPERATIONS.5. ALL EROSION CONTROL METHODS SHALL COMPLY WITH MPCA AND OTHER LOCALREGULATIONS.6. IF EROSION AND SEDIMENT CONTROL MEASURES TAKEN ARE NOT ADEQUATE AND RESULT INDOWNSTREAM SEDIMENT, THE CONTRACTOR SHALL BE RESPONSIBLE FOR CLEANING OUTDOWNSTREAM STORM SEWERS AS NECESSARY, INCLUDING ASSOCIATED RESTORATION.7. SEDIMENT CONTROL DEVICE AT STORM SEWER INLETS. AT THE INLETS TO ALL STORM SEWERSTRUCTURES, PROVIDE A PRODUCT FROM THE FOLLOWING LIST. ACCEPTABLE PRODUCTS:A.WIMCO TOP SLAB™ MODEL RD 27.B. INFRASAFE® SEDIMENT CONTROL BARRIER, DISTRIBUTED BY ROYAL ENVIRONMENTALSYSTEMS, INC. SCB'S SHALL BE SIZED SPECIFICALLY FOR THE STRUCTURE ANDCASTING SPECIFIED. SCB'S SHALL BE EQUIPPED WITH FRAME AND PERFORATEDSHROUD AND SHALL BE WRAPPED ON THE OUTSIDE, COVERING THE PERFORATED WALLONLY, WITH A GEOTEXTILE SOCK.C. DANDY BAG® OR DANDY BAG II® DISTRIBUTED BY BROCK WHITE COMPANY, ST. PAUL,MN (615) 647-0950. DANDY BAG SHALL BE USED ONLY FOR CURB INLETS AFTERPAVEMENT (BINDER COURSE OR WEAR COURSE) IS INSTALLED OR AT EXISTING PAVEDAREAS.D. INFRASAFE® DEBRIS COLLECTION DEVICE BY ROYAL ENVIRONMENTAL SYSTEMS, INC.,DISTRIBUTED BY ESS BROTHERS, 9350 COUNTY ROAD 19, CORCORAN, MN 55357 DCD'SSHALL BE SIZED SPECIFICALLY FOR THE STRUCTURE AND CASTING SPECIFIED. PROVIDEFILTER BAGS AND TIES FOR COMPLETE INSTALLATION.E. OR APPROVED EQUAL.NOTESLEGENDEXCERPT FROM THE SWPPP NARRATIVEThe following is from the Storm Water Pollution Prevention Plan Narrative, Section 01 89 13 of the Project Manual. In accordance withSection 31 00 00, the Contractor shall be responsible for full implementation of and maintenance required by the SWPPP Narrative until theNotice of Termination is approved by the MPCA. Should differences arise between the SWPPP Narrative information described below and theinformation contained within the SWPPP Narrative, bound into the Project Manual, the SWPPP in the Project Manual shall govern.V.General Construction SequenceA.Erosion Control Devices, noted herein, include:1.Silt fence2.Sediment Control Device at storm sewer inlets3.Sediment log4.Rock construction entrance5.Rock check dams6.Rip rap7.Storm water treatment basins8.Temporary sediment basins9.Storm sewer systems10.Temporary outlet pipes11.Erosion control blanket12.Temporary seeding13.Final seeding / sodding14.Temporary / permanent vegetation15.Other features identified by the Minnesota Pollution Control Agency, City or Engineer as a Best Management Practice (BMP) device.B.Contractor shall apply for NPDES Phase II Permit within 24 hours of award of Contract.1.The Contractor shall post the permit in the job site trailer or other suitable temporary storage area.C.Review the SWPPP and its sequencing and requirements. The Contractor shall notify the Engineer if site conditions, constructionsequencing, or other items are different or require modification from this written SWPPP. The Engineer will review the suggestedmodifications and amend the SWPPP accordingly.D.Following review of the SWPPP plans commence with the following construction sequence:1.Install perimeter silt fence where indicated on the Drawings. Silt fence shall be as specified in Section 31 25 00.2.Prior to construction, delineate turf and vegetated areas not to be disturbed with orange snow fence. No construction traffic,equipment or materials shall be permitted to utilize, access, or otherwise enter the areas designated not to be disturbed. Minimize soilcompaction and disruption of topsoil in areas outside the construction limits to comply with MN Construction Stormwater GeneralPermit.3.Locally strip topsoil and push topsoil into minimum 2 foot high temporary berms at perimeter silt fence locations for redundanterosion protection. Where possible, leave an undisturbed vegetation strip between the temporary topsoil berm and the silt fence. Siltfence shall be located downslope from the temporary berm.a.Provide temporary seed and mulch on temporary berms as described herein.4.Construct Sediment Control Devices at existing storm sewer inlets (hay bales around castings and silt fence under castings will not beacceptable).5.Construct the rock construction entrances.6.Have silt fence and other erosion control devices inspected by local authorities, as required by the local authority.7.Begin work at the building additions to allow for critical path construction of buildings footings, foundations, and the remainder of thebuildings.a.Remove existing surface features (pavements, curbing, etc.). Minimize disturbance to minimize erosion potential.b.Strip and stockpile topsoil from the building additions and its oversize area. Provide temporary seed and mulch on stockpile asdescribed herein.c.Establish a concrete truck washout area and post with a sign.d.Rough grade the building pads.e.Complete the grading of the building pads.f.Begin footing excavations.g.Provide temporary seed and mulch on all stockpiles as described herein.8.Construct the sanitary sewer systems.a.Remove existing surface features (pavements, curbing, etc.). Minimize disturbance to minimize erosion potential.b.Strip and stockpile topsoil. Provide temporary seed and mulch on stockpile as described herein.c.Stockpile excavated soils away from drainage swales.d.Backfill excavations at the end of each day.9.Construct the watermain systems.a.Remove existing surface features (pavements, curbing, etc.). Minimize disturbance to minimize erosion potential.b.Strip and stockpile topsoil. Provide temporary seed and mulch on stockpile as described herein.c.Stockpile excavated soils away from drainage swales.d.Backfill excavations at the end of each day.10.Begin work on the west / south perimeter drives, northeast parking, parking area north of Lake Valentine Road, and bus parking areas,and surrounding areas. Work may occur simultaneously.a.Strip and stockpile topsoil. Provide temporary seed and mulch on stockpile as described herein.b.Remove existing surface features (pavements, curbing, etc.). Minimize disturbance to minimize erosion potential.c.Rough grade the parking lots and drive areas.d.Construct proposed storm sewer system.(1)Construct Sediment Control Devices at proposed storm sewer inlets (hay bales around castings and silt fence under castingswill not be acceptable).e.Construct the underground stormwater systems.(1)Protect the underground retention systems during construction.(2)Construct a temporary berm around the open excavations to prevent construction site sediment from reaching theunderground retention systems. The temporary berms can be a simple wind-row of soil pushed into a berm from theadjacent areas.(3)Do not allow sediment to reach the underground systems. Maintenance of Sediment Control Devices is critical until theupslope areas are stabilized.(4)Once backfilling the underground retention systems is complete, remove the temporary berm.f.Establish subgrade elevation at the parking lot and drive areas, and prepare these areas for subsequent courses.g.Once pavement subgrade testing is complete, construct the stabilized aggregate base course. This will serve as temporarystabilization for the parking lot and drive areas.h.Construct curb and gutter, driveway entrance, and concrete walks. This will serve as permanent stabilization for the walk areas.i.Construct the first lift of pavement in the parking lot and drive areas. This will serve as permanent stabilization for thebituminous paved areas.j.Once the upslope areas are stabilized, Construct the Filtration Area.(1)The parking lot relies on this area for storm drainage. Therefore, it is critical to maintain or enhance the infiltratingproperties of the soils within this area. Options to accomplish include the following:(a)Limit construction traffic within these areas as much as possible to avoid contaminating and compacting the soils inthese areas.(b)Use a toothed bucket backhoe to excavate soils. Use off road trucks to haul and dump soils to other parts of the site.(c)Use a bucket and backhoe to place soils (where fill is required).(d)Use a toothed bucket for rough grading.(e)Use manual labor for finish grading.(f)Do not use equipment on the surface of the areas as this will compact the soils. Minimize smearing of the soils withmechanical equipment.(g)No stockpiling of soils or other materials shall occur within the areas.(2)Rough grade the filtration area to specified tolerances and in accordance with the procedures listed in Section 31 00 00Earthwork.(a)Access the area at a single location to minimize disturbance to the surrounding areas.(b)Use of self propelled equipment shall be limited within the Filtration Area. Self propelled equipment will compact thesoils and adversely affect infiltration. As much as possible, access work in the filtration area from the edges, outside ofthe filtration area limits.(c)Use a backhoe with long reach ability for final excavation that reaches from outside the areas).(d)Remove all debris by hand.(e)Scarify the existing underlying soils as specified in Section 31 00 00 Earthwork.(3)Provide final grading and final restoration at the Filtration Area, including:(a)Access the areas at a single location to minimize disturbance to the surrounding areas.(b)Use of self propelled equipment shall be as described above. Do not use skid steer equipment within the area.(c)Final grade by hand.(d)Prepare this area for final restoration.(e)Provide final seed and mulch. This will serve as permanent stabilization for the slopes adjacent to the Filtration Area.(f)Sod the areas by hand.(g)Establish vegetation by watering with a temporary irrigation system. Refer to Section 31 00 00 Earthwork foradditional information.11.Spread topsoil and finish grade turf grass areas (except around the building addition until exterior building work is complete).12.Install landscaping and plantings.13.Sod the turf grass areas except for the areas around the building. Use a temporary irrigation system to keep sod adequately watered.This will serve as permanent stabilization for the turf grass areas.14.Complete exterior building work.15.Spread topsoil around the building area.16.Finish grade topsoil and prepare these areas for sod.17.Sod the areas around the building. Use a temporary irrigation system to keep sod adequately watered.18.Provide final lift of pavement and pavement markings.19.Provide final stabilization and cleanup of the site.E.Provide maintenance to erosion control devices and BMP’s to comply with the requirements of the permit.F.Re-install all sediment control practices that have been adjusted or removed to accommodate short-term activates, such as passage ofconstruction vehicles or equipment, immediately after the short-term activity has been completed. All sediment control practices shall bere-installed before the next precipitation event if the short term activity is not complete.G.Inspect erosion control devices and provide routine maintenance as follows:1.Inspect erosion control a minimum of once per week and after each rain event measuring 0.5" or more. Record inspection on logposted in Contractor’s construction trailer or other suitable temporary storage area.a.Records of each inspection and maintenance activity shall include:(1)Date and time of inspections(2)Name of person conducting inspection(3)Findings of inspections, including recommendations for corrective actions(4)Findings shall include photographs, accurate description of the observations (i.e., color, odor, settled or suspended solids, oilsheen, or other pollutants), and a map describing the locations of the observations(5)Corrective actions taken (including dates, times, and party completing maintenance activities(6)Date and amount of all rainfall events greater than one quarter inch (0.25 inch) in 24 hours(7)Documentation of changes made to the SWPPP as required by the NPDES General Stormwater Permit for ConstructionActivity (MN R100001)b.Inspections are not required where the ground is frozen. The required inspectionsand maintenance schedule must begin within 24 hours after runoff occurs at the site or 24 hours prior to resuming construction,whichever comes first.c. Inspections of areas with permanent cover may be reduced to once per month, even if construction activity continues on otherportions of the site. Once all construction activity is complete, monthly inspections may be terminated after one year followingcompletion of all construction activities.2.Provide maintenance for all devices as follows:a.Silt fences, sediment logs, and erosion control devices at storm sewer inlets shall be inspected for depth of sediment, tears, to seeif fabric is securely attached to support posts or structure, and to see that posts and devices are securely in place.b.Silt fences, sediment logs and erosion control devices at storm sewer inlets, and other erosion control devices shall be cleanedwhen sediment reaches 1/3 the height of the erosion control device, within 24 hours.c.Rock construction entrances shall be inspected for clogging of river rock. River rock that has become clogged with sedimentshall be removed and replaced with fresh river rock.d.Repairs or replacements to all erosion control devices shall occur within 24 hours of discovery.e.Temporary diversion berms shall be inspected and any breaches promptly repaired.f.Tracked sediment from construction vehicles on to public streets and paved areas (including paved areas on the construction site)shall be removed within 24 hours of discovery.g.Removal of sediment and restabilization of Surface Waters shall be accomplished within 7 days of discovery (note: surfacewaters include curb and gutter, pavements, storm sewer, swales, or other similar storm water conveyance devices).h.Inlet protection may be removed if a local unit of government directs the permitee to do so because of a specific safety concern.H.Provide dewatering of excavations as identified in Section 31 00 00.I.Temporary Soil Stockpiles:1.Temporary soil stockpiles shall not be placed in surface waters of the state, including surface conveyances such as curb and gutter,swales, or ditches.2.Install silt fence at the base of the temporary soil stockpile (full perimeter).3.Temporary soil stockpiles shall be seeded with temporary seed mix and hydromulch when stockpiles are left inactive for seven (7)days. Note, this does not apply to aggregate stockpiles or other stockpiles without significant silt, clay or organic components (cleanaggregate stockpiles, clean rock, clean sand and similar clean aggregates).J.Stabilize denuded areas, initiated immediately, within the following number of days of last construction activity (temporary or permanent)in that area:1.Within 7 days, except:a.Temporary soil stockpiles shall be treated with appropriate erosion control measure, including silt fence and temporary seedingwhen stockpiles are left inactive for periods longer than 7 days. Note, this does not apply to aggregate stockpiles or otherstockpiles without significant silt, clay or organic components (clean aggregate stockpiles, clean rock, clean sand and similarclean aggregates).K.Provide maintenance of all seeded and sodded areas until fully established.L.Provide cleaning of storm sewer system at the completion of the project. Cleaning shall include removal of accumulated sediment from allsurface waters as defined by the permit (for example, curb and gutter, pavements, swales, and storm sewer piping and structures).M.Remove silt fence and erosion control devices at storm sewer inlets following full establishment of site vegetation. Dispose materialsproperly off-site.N.Apply for Notice of Termination (NOT) with MPCA. NOT must be submitted within 30 days after:1.Site has undergone Final Stabilization (at least 80% vegetative cover), and2.Removal of all temporary erosion control measures (silt fence, etc.), and3.Final cleanout and maintenance of all permanent storm water facilities, and4.Completion of all maintenance activities and site cleanup.LANDSCAPE ARCHITECTURE SITE PLANNING CIVIL ENGINEERINGANDERSON - JOHNSONASSOCIATES,INC.7575 GOLDEN VALLEY ROAD SUITE 200 MINNEAPOLIS. MN 55427FAX (763) 544-0531 PH (763) 544-7129DateRegistration NumberCheckDrawnDate:CommI hereby certify that this plan, specification or report was prepared byme or under my direct supervision and that I am a duly Licensedunder the laws of the State ofRevisionsDescription Date NumScale:North501 South Eighth StreetMinneapolis, MN 55404krausanderson.com | 612 332 7281MOUNDS VIEWHIGH SCHOOL 2019IMPROVEMENTS1900 Lake Valentine RoadARDEN HILLS, MINNESOTA 551124570 VICTORIA STREET NSHOREVIEW, MINNESOTA 55126ISD #621: MOUNDS VIEWPUBLIC SCHOOLSPROFESSIONAL ENGINEERMINNESOTAC1.541" = 30'DARMET02/06/20191722704018002/06/2019DAVID A. REYFIELDPLANCONTROLAND SEDIMENTPREVENTIONEROSIONREFERENCE KEY TO SITE DETAILS DETAIL I.D NUMBER (TOP) DETAIL SHEET NUMBER (BOTTOM)EXISTING CONTOURPROPOSED CONTOURPROPOSED SPOT ELEVATIONME = MATCH EXISTINGEOF = EMERGENCY OVERFLOWPROPOSED GRADING LIMITSPROPOSED STORM SEWERPROPOSED MANHOLE (MH)PROPOSED CATCH BASIN (CB)PROPOSED FLARED END SECTION (FES)PROPOSED SILT FENCEPROPOSED SEDIMENT CONTROL LOGPROPOSED ROCK CONSTRUCTION ENTRANCESEDIMENT CONTROL DEVICE AT STORM SEWER INLETPROPOSED BUILDING STOOP - REFER TO ARCHITECTURAL PLANSPROPERTY LINEA15C2.1119C2.1120C2.1122C2.1123C2.1191515.61C2.111C2.112C2.113C2.11Addendum #2 02/22/20191
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