|
SEQUENCE OF CONSTRUCTION:
<br />Construction shall proceed in the following sequence:
<br />1. Contractor shall schedule and conduct a pre -construction meeting with the City.
<br />2. Contractor shall secure all necessary permits and licenses.
<br />3. Furnish & install erosion control measures.
<br />4. Maintain erosion control measures, i.e. silt fence, inlet protection.
<br />5. Remove existing bituminous pavement and base.
<br />6. Excavate and grade storm water ponds.
<br />7. Install utilities; backfill excavation, grade and compact as required.
<br />8. Furnish & install concrete curb and gutter.
<br />9. Furnish & install aggregate base, base course of bituminous pavement
<br />10. Install restoration per plan.
<br />11. Furnish & install wear course of bituminous pavement.
<br />12. Remove erosion control after vegetation is established.
<br />ADDITIONAL STORMWATER POLLUTION PREVENTION, GRADING PLAN, AND SCHEDULE NOTES:
<br />1. All slopes to be 1:4 unless approved by the city engineer.
<br />2. Below grade structures shall be protected and meet drainage requirements per the city engineer.
<br />3. Construction operation hours are from 7:00 a.m. - 10:00 p.m. Monday through Saturday.
<br />4. Call Gopher State One Call for utility locations prior to any work at 1-800-252-1166.
<br />5. Permittee may need to modify SWPPP if the general objectives of controlling pollutants is not being met.
<br />6. Operator shall implement these and any other BMP's that may be required to meet the general permit
<br />requirements.
<br />7. Site is not in karst area or pollution or remediation site.
<br />8. Silt fence to be installed downhill from any grading activity.
<br />9. If tracking onto adjacent streets occurs a street sweeper shall be used to clean streets within 8 hours or as
<br />directed by the engineer.
<br />10.Dust control may be necessary during rough grading. No grading can take place if wind speed exceeds 25
<br />mph.
<br />11.Solid waste shall be collected and disposed of properly and must comply with MPCA disposal
<br />requirements.
<br />12.Hazardous materials shall be stored properly to prevent spills and vandalism.
<br />13.No engine degreasing is allowed on site. External washing of vehicles shall be limited to a defined area
<br />(bone yard) on site.
<br />14.Permittee(s) shall adhere to all SWPPP specifications on the plan and other MPCA permit requirements.
<br />EROSION PREVENTION PRACTICES:
<br />1. The permittee(s) must plan for and implement appropriate construction phasing, vegetative buffer strips,
<br />horizontal slope grading, and other construction practices that minimize erosion, so that the inspection
<br />and maintenance requirements are complied with. The location of areas not to be disturbed must be
<br />delineated (e.g. with flags, stakes, signs, silt fence, etc.) on the development site before work begins.
<br />2. All exposed soil areas must be stabilized as soon as practical, but in no case later than 7 days after the
<br />construction area has temporarily or permanently ceased.
<br />These areas include constructed stormwater management pond side slopes, and any exposed soil areas
<br />with a positive slope to a stormwater conveyance system, such as a curb and gutter system, storm sewer
<br />inlet, temporary or permanent drainage ditch or other natural or man made systems that discharge to a
<br />surface water.
<br />3. The normal wetted perimeter of any temporary or permanent drainage ditch that drains water from a
<br />construction site, or diverts water around a site, must be stabilized within 200 lineal feet from the
<br />property edge, or from the point of discharge to any surface water. Stabilization must be completed
<br />within 24 hours of connecting to a surface water.
<br />4. Pipe outlets must be provided with temporary or permanent energy dissipation within 24 hours of
<br />connection to a surface water.
<br />5. All disturbed areas, except roadways, building areas, parking areas, islands and sidewalk, shall be restored
<br />with minimum 4 inches topsoil, seeded and mulched within 7 days of completion of site grading. Seeding
<br />shall be in accordance with MnDOT Specification 2575. Where side slopes exceed or equal 1:3 and
<br />running slope is greater than 1:50, a polypropylene netting or wood fiber blanket shall be provided and
<br />staked over the mulched area. Seed and mulch types and applications rates are per plan and specification.
<br />6. Refer to restoration plan for areas to be seeded or sodded for erosion control.
<br />DEWATERING AND BASIN DRAINING:
<br />1. Dewatering or basin draining (e.g. pumped discharges, trench/ditch cuts for drainage) related to the
<br />construction activity that may have turbid or sediment laden discharge water must be discharged to a
<br />temporary or permanent sedimentation basin on the project site whenever possible. If the water cannot
<br />be discharged to a sedimentation basin prior to entering the surface water, it must be treated with the
<br />appropriate BMP's, such that the discharge does not adversely affect the receiving water or downstream
<br />landowners. The permittee(s) must ensure that discharge points are adequately protected from erosion
<br />and scour. The discharge must be dispersed over natural rock rip rap, sand bags, plastic sheeting or other
<br />accepted energy dissipation measures. Adequate sedimentation control measures are required for
<br />discharge water that contains suspended solids.
<br />2. All water from dewatering or basin draining activities must be discharged in a manner that does not cause
<br />nuisance conditions, erosion in receiving channels or on downslope properties, or inundation in wetlands
<br />causing significant adverse impact to the wetland.
<br />SEDIMENT CONTROL PRACTICES:
<br />1. Sediment control practices must minimize sediment from entering surface waters, including curb and
<br />gutter systems and storm sewer inlets.
<br />a. Temporary or permanent drainage ditches and sediment basins that are designed as part of a
<br />treatment system (e.g. ditches with rock check dams) require sediment control practices only as
<br />appropriate for site conditions.
<br />b. lithe down gradient treatment system is overloaded, additional upgradient sediment control practices
<br />must be installed to eliminate the overloading, and the SWPPP must be amended to identify these
<br />additional practices.
<br />c. In order to maintain sheet flow and minimize rills and/or gullies, there shall be no unbroken slope
<br />length of greater than 75 feet for slopes with a grade of 1:3 or steeper.
<br />2. Sediment control practices must be established on all down gradient perimeters before any upgradient
<br />land disturbing activities begin. These practices shall remain in place until final stabilization has been
<br />established.
<br />3. The timing of the installation of sediment control practices may be adjusted to accommodate short-term
<br />activities such as clearing or grubbing, or passage of vehicles. Any short-term activity must be completed
<br />as quickly as possible and the sediment control practices must be installed immediately after the activity
<br />is completed. However, sediment control practices must be installed before the next precipitation event
<br />even if the activity is not complete.
<br />4. All storm drain inlets must be protected by appropriate BMP's during construction until all sources with
<br />potential for discharging to the inlet have been stabilized.
<br />5. Temporary soil stockpiles must have silt fence or other effective sediment controls, and cannot be placed
<br />in surface waters, including stormwater conveyances such as curb and gutter systems, or conduits and
<br />ditches.
<br />6. Stockpile areas which remain on the site for more than seven days shall be seeded, mulched, and
<br />surrounded by silt fence.
<br />7. Vehicle tracking of sediment from the construction site must be minimized by BMP's such as stone pads,
<br />concrete or steel wash racks, or equivalent systems. Street sweeping must be used if such BMPs are not
<br />adequate to prevent sediment from being tracked onto the street.
<br />8. The permittee must install temporary sedimentation basins as required.
<br />INSPECTIONS AND MAINTENANCE:
<br />1. The permittee(s) (either the owner or operator, whoever is identified in the SWPPP) must routinely inspect
<br />the construction site once every seven (7) days during active construction and within 24 hours after a
<br />rainfall event greater than 0.5-inches in 24 hours. Following an inspection that occurs within 24 hours after
<br />a rainfall event, the next inspection must be conducted within 7 days.
<br />2. All inspections and maintenance conducted during construction must be recorded in writing and these
<br />records must be retained with the SWPPP. Records of each inspection and maintenance activity shall
<br />include:
<br />a. Date and time of inspections;
<br />b. Name of persons conducting inspections;
<br />c. Accurate findings of inspections, including the specific location where corrective actions are needed;
<br />d. Corrective actions taken (including dates, times, and party completing maintenance activities);
<br />e. Date of all rainfall events greater than 1/2 inches in 24 hours, and the amount of rainfall for each event.
<br />Permittee(s) must obtain rainfall amounts by either a properly maintained rain gauge installed onsite, a
<br />weather station that is within one (1) mile of your location, or a weather reporting system that provides
<br />site specific rainfall data from radar summaries;
<br />f. If permittee(s) observe a discharge (i.e., color, odor, settled or suspended solids, oil sheen, and other
<br />obvious indicators of pollutant(s);
<br />g. Any amendments to the SWPPP proposed as a result of the inspection must be documented as required
<br />in Section 6 of the general permit within seven (7) calendar days.
<br />3. Where parts of the construction site have undergone final stabilization, but work remains on other parts of
<br />the site, inspections of the stabilized areas may be reduced to once per month. Where work has been
<br />suspended due to frozen ground conditions, the required inspections and maintenance must take place
<br />within 24 hours after runoff occurs at the site or 24 hours prior to resuming construction, whichever occurs
<br />first.
<br />4. All erosion prevention and sediment control BMP's must be inspected to ensure integrity and effectiveness.
<br />All nonfunctional BMP's must be repaired, replaced, or supplemented with functional BMP's. The
<br />permittee(s) must investigate and comply with the following inspection and maintenance requirements:
<br />a. All silt fence must be repaired, replaced, or supplemented when they become nonfunctional or the
<br />sediment reaches 1/3 of the height of the fence. These repairs must be made within 24 hours of discovery, or
<br />as soon as field conditions allow access.
<br />b. Temporary and permanent sedimentation basins must be drained and the sediment removed when the
<br />depth of sediment collected in the basin reaches 1/2 the storage volume. Drainage and removal must be
<br />completed within 72 hours of discovery, or as soon as field conditions allow access.
<br />c. Surface waters, including drainage ditches and conveyance systems, must be inspected for evidence of
<br />sediment being deposited by erosion. The permittee(s) must remove all deltas and sediment deposited in
<br />surface waters, including drainage ways, catch basins, and other drainage systems, and restabilize the areas
<br />where sediment removal results in exposed soil. The removal and stabilization must take place within seven
<br />(7) days of discovery unless precluded by legal, regulatory, or physical access constraints. The permittee
<br />shall use all reasonable efforts to obtain access. If precluded, removal and stabilization must take place
<br />within seven (7) calendar days of obtaining access. The permittee is responsible for contacting all local,
<br />regional, state and federal authorities and receiving any applicable permits, prior to conducting any work.
<br />d. Construction site vehicle exit locations must be inspected for evidence of off -site sediment tracking onto
<br />paved surfaces. Tracked sediment must be removed from all paved surfaces within 3 hours after notification
<br />by the City that sweeping is required.
<br />e.The permittee(s) are responsible for the operation and maintenance of temporary and permanent water
<br />quality management BMP's as well as all erosion prevention and sediment control BMP's, for the duration
<br />of the construction work at the site. The permittee(s) are responsible until another permittee has assumed
<br />control over all areas of the site that have not been finally stabilized or the site has undergone final
<br />stabilization, and a NOT has been submitted to the MPCA.
<br />e. If sediment escapes the construction site, off -site accumulations of sediment must be removed in a manner
<br />and at a frequency sufficient to minimize off -site impacts (e.g. fugitive sediment in streets could be washed
<br />into storm sewers by the next rain and/or pose a safety hazard to users of public streets).
<br />5. All infiltration areas must be inspected to ensure that no sediment from ongoing construction activities is
<br />reaching the infiltration area and these areas are protected from compaction due to construction
<br />equipment driving across the infiltration area.
<br />6. Storm sewer pipes and structures to be inspected and cleaned out.
<br />DATE
<br />REVISION
<br />I hereby certify that this plan, specrfication, or report was prepared
<br />by me or under my direct supervision and that I am a duly Licensed
<br />Professional Engineer ufpder the la s of the Sty of Minnesota
<br />JOE FE'RTRNCEK
<br />Date 03/21/25
<br />Lic No 57095
<br />DESIGNED BY:
<br />JJF
<br />DRAWN BY:
<br />JJF
<br />cnTE
<br />03/21/25
<br />CHECKED BY:
<br />JJF
<br />FILE
<br />25-03
<br />CITY OF RAMSEY
<br />7550 SUNWOOD DRIVE
<br />RAMSEY, MN 55303
<br />(763) 427-1410 FAX (763) 433-9898
<br />SWPPP
<br />S.A.P. 199-106-012 / S.A.P 199-107-010
<br />ALPINE DRIVE RECONSTRUCTION
<br />CITY PROJECT NO. 25-03
<br />CITY OF RAMSEY, MINNESOTA
<br />SHEET
<br />19
<br />OF
<br />84S
<br />
|