|
GENERAL SWPPP REQUIREMENTS AND NOTES:
<br />SWPPP AMENDMENTS (SECTION 6):
<br />1. One of the individuals described in item 21.2.a or 21.2.b of the permit or another qualified
<br />individual must complete all SWPPP changes. Changes involving the use of less stringent BMPs
<br />must include a justification describing how the replacement BMP is effective for the site
<br />characteristics.
<br />2. The SWPPP shall be amended to include additional or modified BMPs as necessary to correct
<br />problems identified or address situations whenever there is a change in design, construction,
<br />operation, maintenance, weather or seasonal conditions having a significant effect on the
<br />discharge of pollutants to surface waters or groundwater.
<br />3. The SWPPP shall be amended to include additional or modified BMPs as necessary to correct
<br />problems identified or address situations whenever inspections or investigations by the site owner
<br />or operator, USEPA or MPCA officials indicate the SWPPP is not effective in eliminating or
<br />significnatly minimizing the ischarge of pollutants to surface waters or groundwater or the
<br />discharges are cuasing water quality standard exceedances (e.g., nuisance conditions as defined
<br />in Minn. R. 7050.0210, subp. 2 or the SWPPP is not consistend with the ofjectives of the USEPA
<br />approved TMDL.
<br />BMP SELECTION AND INSTALLATION (SECTION 7):
<br />1. All BMPs identified in the SWPPP document and construction plans shall be selected, installed,
<br />and maintained in an appropriate and functional manner in accordance with relevant manufacturer
<br />specifications and accepted engineering practices.
<br />2. Do not disturb more land (i.e., phasing) than can be effectively inspected and maintained in
<br />accordance with Section 11.
<br />TEMPORARY EROSION PREVENTION PRACTICES (SECTION 8)
<br />1. Prior to beginning any construction work at the site, locations of areas not to be disturbed must be
<br />delineated(e.g.,with flags, stakes, signs, silt fence, snow fence, etc.) throughout the project site.
<br />2. Minimize the need for disturbance ofportions of the project with steepsloes. For those sloped
<br />p p
<br />areas which must be disturbed, use techniques such as phasing and stabilization practices
<br />designed for steep slopes (e.g., slope draining and terracing).
<br />3. Stabilize all exposed soil areas (including stockpiles). Stabilization must be initiated immediately to
<br />limit soil erosion whenever any construction activity has permanently or temporarily ceased on any
<br />portion of the site and will not resume fora period exceeding 14 calendar days (or 7 days if within
<br />one mile of an identified impaired water). Stabilization must be completed no later than 14
<br />calendar days (or 7 days if within one mile of an identified impaired water) after the construction
<br />activity has ceased.
<br />4. Stabilization is not required on constructed base components of roads, parking lots, and similar
<br />surfaces. Stabilization is not required on temporary stockpiles without significant silt, clay or
<br />organic components (e.g., clean aggregate stockpiles, demolition concrete stockpiles, sand
<br />stockpiles) but sediment controls must be placed at the base of the stockpile.
<br />5. For Public Waters that the Minnesota Department of Natural Resources has promulgated "work in
<br />p p 9
<br />water restrictions" during specified fish spawning time frames, all exposed soil areas that are within
<br />200 feet of the waters edge, and drain to these waters must complete the stabilization activities
<br />within 24 hours during the restriction period.
<br />6. Stabilize the normal wetted perimeter of the last 200 linear feet of temporary or permanent
<br />drainage ditches or swales that drain water from the site within 24 hours after connecting to a
<br />surface water or property edge. Stabilize remaining portions of temporary or permanent ditches or
<br />swales within 14 calendar days (or 7 days if within one mile of an identified impaired water) after
<br />connecting to a surface water or property edge and construction in that portion of the ditch
<br />temporarily or permanently ceases.
<br />7. Temporary or permanent ditches or swales being used as sediment containment systems during
<br />construction (with properly designed rock -ditch checks, bio rolls, silt dikes, etc.) do not need to be
<br />stabilized during the temporary period of use as a sediment containment system. These areas
<br />must be stabilized within 24 hours after no longer being used for as a sediment containment
<br />system.
<br />8. Applying h dromulch tackifier,of ac lamide or similar erosionprevention practices is not
<br />mulch, Yp Y rY
<br />acceptable within any portion of the normal wetted perimeter of a temporary or permanent
<br />drainage ditch or swale section with a continuous slope of greater than 2 percent.
<br />9. Pipe outlets must be provided with temporary or permanent energy dissipation within 24 hours
<br />after connection to a surface water or permanent stormwater treatment system.
<br />10. Route water around unstabilized areas on the site and to reduce erosion, unless infeasible. Use
<br />erosion controls and velocity dissipation devices such as check dams, sediment traps, riprap, or
<br />grouted riprap at outlets within and along the length of any constructed stormwater conveyance
<br />channel, and at any outlet, to provide a non -erosive flow velocity, to minimize erosion of channels
<br />and their embankments, outlets, adjacent stream banks, slopes, and downstream waters during
<br />discharge conditions.
<br />11. Unless infeasible due to lack of pervious or vegetated areas, direct discharges from BMPs to
<br />vegetated areas of the site (including any natural buffers) in order to increase sediment removal
<br />and maximize stormwater infiltration. Use velocity dissipation devices if necessaryto prevent
<br />erosion when directing stormwater to vegetated areas.
<br />12.Infiltration areas shall not be excavated until all upstream areas have been stabilized and/or
<br />upstream BMPs are in place to properly prevent sediment deposition. Only low impact equipment
<br />shall be allowed in infiltration areas which shall be clearly identified, staked, and marked/fenced
<br />off.
<br />13. Project phasing shall be implemented to ensure land disturbance and temporary erosion control
<br />measures can be effectively inspected and maintained throughout the duration of the project in
<br />accordance with the Inspection and Maintenance requirements of Section 11.
<br />W:\2025\Civil\12256081 - Brookside Terrace\3. Working Docs\C. Drawing Files\1XXXX - C600 SWPPP Sheets.dwg
<br />TEMPORARY SEDIMENT CONTROL PRACTICES (SECTION 9)
<br />1. Sediment control practices must be established on all down gradient perimeters and be located
<br />upgradient of any buffer zones. The perimeter sediment control practices must be in place before
<br />any upgradient land -disturbing activities begin. These practices shall remain in place until Final
<br />Stabilization has been established.
<br />2. If downgradient sediment controls become overloaded, based on frequent failure or excessive
<br />maintenance requirements, additional upgradient sediment control practices or redundant BMPs
<br />shall be installed to eliminate the overloading concerns. All changes shall be recorded in the
<br />SWPPP.
<br />3. Temporary orpermanent drainage ditches and sediment basins designed as part of a sediment
<br />p rY 9 9
<br />containment system (e.g., ditches with rock -check dams) require sediment control practices only
<br />as appropriate for site conditions.
<br />4. A floating silt curtain placed in the water is not an acceptable sediment control BMP except when
<br />working on a shoreline or below the waterline. Immediately after construction activity (e.g.,
<br />installation of rip rap along the shoreline) in that area is complete, upland perimeter control
<br />practices shall be installed if exposed soils still drain to a surface water.
<br />5. Re -install all sediment control practices that have been adjusted or removed to accommodate
<br />short-term activities such as clearing or grubbing, or passage of vehicles, immediately after the
<br />short-term activity has been completed. Complete any short-term activity that requires removal of
<br />sediment control practices as quickly as possible and re -install sediment control practices before
<br />the next precipitation event even if the short-term activity is not complete.
<br />6. All storm drain inlets must be protected by appropriate BMPs during construction until all sources
<br />with potential for discharging to the inlet have been stabilized. Inlet protection may be removed for
<br />a particular inlet if a specific safety concern (street flooding/freezing) has been identified by the
<br />Permittee(s) or the jurisdictional authority (e.g., city/county/township/MnDOT engineer).The
<br />Permittee(s) must document the need for removal in the SWPPP.
<br />7. Temporary soil stockpiles must have silt fence or other effective sediment controls, and cannot be
<br />p rY p
<br />placed in any natural buffers or surface waters, including stormwater conveyances such as curb
<br />and gutter systems, or conduits and ditches unless there is a bypass in place for the stormwater.
<br />8. Where vehicle traffic leaves any part of the site (or onto paved roads within the site) install a
<br />vehicle tracking BMP to minimize the track out of sediment from the construction site. Examples of
<br />vehicle tracking BMPs include (but are not limited to) rock pads, mud mats, slash mulch, concrete
<br />or steel wash racks, or equivalent systems. Use street sweeping if such vehicle tracking BMPs are
<br />not adequate to prevent sediment from being tracked onto the street.
<br />9. The Permittee(s) must install temporary sedimentation basins as required in accordance with
<br />permit requirements.
<br />10.Minimize soil compaction by restricting vehicle access in areas where final vegetative stabilization
<br />will occur, unless otherwise infeasible.
<br />11. Discharges from BMPs shall be directed to vegetated areas unless infeasible.
<br />12. Preserve a 50 foot natural buffer or (if a buffer is infeasible on the site) provide redundant (double)
<br />perimeter sediment controls when a surface water is located within 50 feet of the project's earth
<br />disturbances and stormwater flows to the surface water.
<br />13. Perimeter sediment controls shall be installed at least 5 feet apart unless limited by lack of
<br />available space. Natural buffers are not required adjacent to road ditches, judicial ditches, county
<br />ditches, stormwater conveyance channels, storm drain inlets, and sediment basins. If preserving
<br />the buffer is infeasible, the reasons for which shall be recorded in the SWPPP.
<br />14. The use of polymers, flocculants, or other sedimentation treatment chemicals, if used on the
<br />project, shall be used in accordance with accepted engineering practices, dosing specifications,
<br />and sediment removal design specifications provided by the product manufacturer or supplier. Use
<br />conventional erosion and sediment controls prior to the chemical addition to ensure effective
<br />treatment. Chemicals may only be applied where treated stormwater is directed to a sediment
<br />control system which allows or filtration of settlement of the floc prior to discharge.
<br />15.If the proposed project as shown on the plans has 10 or more acres draining to a common location
<br />or 5 acres or more if the site is within one mile of a special or impaired water (as identified in
<br />Section II - Receiving Waters and Environmentally Sensitive Areas), then a temporary sediment
<br />basin must be constructed as shown on the plans. Temporary sediment basins will have a
<br />minimum of 3,600 cubic feet of storage per acre draining to the basin. The basin outlet shall
<br />provide for discharging water from the surface to minimize discharging of pollutants. A stabilized
<br />emergency overflow shall be constructed.
<br />DEWATERING AND BASIN DRAINING (SECTION 10)
<br />1. Discharge turbid or sediment -laden waters related to dewatering or basin draining (e.g., pumped
<br />discharges, trench/ditch cuts for drainage) to a temporary or permanent sediment basin on the
<br />project site unless infeasible. Discharge from the temporary or permanent sedimentation basins to
<br />surface waters if the basin water has been visually checked to ensure adequate treatment has
<br />been obtained in the basin and that nuisance conditions will not result from the discharge. If the
<br />water cannot be discharged to a sedimentation basin prior to entering the surface water, it must be
<br />treated with the appropriate BMPs, such that the discharge does not adversely affect the receiving
<br />water or downstream properties.
<br />2. Discharge water that contains oil or grease, must use an oil -water separator or suitable filtration
<br />device (e.g. cartridge filters, absorbents pads) prior to discharging the water.
<br />3. All water from dewatering or basin -draining activities must be discharged in a manner that does
<br />not cause nuisance conditions, erosion in receiving channels or downslope properties, erosion or
<br />scour in the immediate vicinity of discharge points, or inundation in wetlands causing significant
<br />adverse impact to the wetland.
<br />4. The use of filters with backwash water, haul the backwash water away for disposal, return the
<br />backwash water to the beginning of the treatment process, or incorporate the backwash water into
<br />the site in a manner that does not cause erosion. Discharge backwash water to the sanitary sewer
<br />if permission is granted by the sanitary sewer authority. Replace and clean the filter media used in
<br />dewatering devices when required to retain adequate function.
<br />INSPECTIONS AND MAINTENANCE (SECTION 11)
<br />1. Owner and Contractor shall ensure that a trained person (as identified in item 21.2.b) of the permit will
<br />inspect the entire construction site at a minimum:
<br />- Once every seven (7) days during active construction, and
<br />- Within 24 hours after a rainfall event greater than 1/2 inch in 24 hours
<br />2. Inspect all erosion prevention and sediment control BMPs and Pollution Prevention Management
<br />Measures to ensure integrity and effectiveness during all routine and post -rainfall event inspections. All
<br />nonfunctional BMPs must be repaired, replaced, or supplemented with functional BMPs by the end of the
<br />next business day after discovery, or as soon as field conditions allow access unless another time frame
<br />is specified below. Investigate and comply with the following Inspection and Maintenance requirements:
<br />a. All perimeter control devices must be repaired, replaced, or supplemented when they become
<br />nonfunctional or the sediment reaches one-half (1/2) of the height of the device. These repairs must
<br />be made by the end of the next business day after discovery, or thereafter as soon as field conditions
<br />allow access.
<br />b. Temporary and permanent sedimentation basins must be drained and the sediment removed when
<br />the depth of sediment collected in the basin reaches one-half (1/2) the storage volume. Drainage and
<br />removal must be completed within 72 hours of discovery, or as soon as field conditions allow access.
<br />c. Inspect and photograph dewatering discharges at the beginning and at least once every 24 hours
<br />during operation.
<br />d. Surface waters, including drainage ditches and conveyance systems, must be inspected for evidence
<br />of erosion and sediment deposition during each inspection. Remove all deltas and sediment
<br />deposited in surface waters, including drainage ways, catch basins, and other drainage systems, and
<br />restabilize the areas where sediment removal results in exposed soil. The removal and stabilization
<br />must take place within seven (7) days of discovery unless precluded by legal, regulatory, or physical
<br />access constraints. Use all reasonable efforts to obtain access. If precluded, removal and stabilization
<br />must take place within seven (7) calendar days of obtaining access. Contact all local, regional, state
<br />and federal authorities and receiving any applicable permits, prior to conducting any work in surface
<br />waters.
<br />e. Construction site vehicle exit locations must be inspected for evidence of off -site sediment tracking
<br />onto paved surfaces. Tracked sediment must be removed from all paved surfaces both on and off site
<br />within 24 hours of discovery, or if applicable, within a shorter time.
<br />f. Streets and other areas adjacent to the project must be inspected for evidence of off -site
<br />accumulations of sediment. If sediment is present, it must be removed in a manner and at a frequency
<br />sufficient to minimize off -site impacts (e.g., fugitive sediment in streets could be washed into storm
<br />sewers by the next rain and/or pose a safety hazard to users of public streets).
<br />5. Inspection frequency adjustment:
<br />a. Inspections of areas with permanent cover can be reduced to once per month, even if construction
<br />activity continues on other portions of the site; or
<br />b. where sites have permanent cover on all exposed soil and no construction activity is occurring
<br />anywhere on the site, inspections can be reduced to once per month and, after 12 months, may be
<br />suspended completely until construction activity resumes. The MPCA may require inspections to
<br />resume if conditions warrant; or
<br />c. where construction activity has been suspended due to frozen ground conditions, inspections may be
<br />suspended. Inspections must resume within 24 hours of runoff occurring, or upon resuming
<br />construction, whichever comes first.
<br />3. All inspections and maintenance activities within 24 hours of being conducted must be recorded and
<br />retained in the SWPPP. These records must include:
<br />a. Date and time of inspections
<br />b. Name of person(s) conducting inspections
<br />c. 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 and amount of all rainfall events greater than 1/2 inch (0.5 inches) in 24 hours. Rainfall amounts
<br />must be obtained by a properly maintained rain gauge installed onsite, a weather station that is within
<br />1 mile of your location or a weather reporting system that provides site specific rainfall data from radar
<br />summaries.
<br />f. If any discharge is observed to be occurring during the inspection, a record of all points of the property
<br />from which there is a discharge must be made, and the discharge should be described (i.e., color,
<br />odor, floating, settled, or suspended solids, foam, oil sheen, and other obvious indicators of pollutants)
<br />and photographed.
<br />g. Any amendments to the SWPPP proposed as a result of the inspection must be documented within
<br />seven (7) calendar days.
<br />4. All infiltration areas must be inspected to ensure that no sediment from ongoing construction activity is
<br />reaching the infiltration area. All infiltration areas must be inspected to ensure that equipment is not being
<br />driven across the infiltration area.
<br />POLLUTION PREVENTION MANAGEMENT MEASURES (SECTION 12)
<br />Implement the following pollution prevention management measures on the site:
<br />1. Storage, Handling, and Disposal of Construction Products, Materials, and Wastes shall comply with the
<br />following to minimize the exposure to stormwater of any of the products, materials, or wastes. Products
<br />or wastes which are either not a source of contamination to stormwater or are designed to be exposed to
<br />stormwater are not held to this requirement:
<br />a. Building products that have the potential to leach pollutants must be under cover (e.g., plastic
<br />sheeting or temporary roofs) to prevent the discharge of pollutants or protected by a similarly effective
<br />means designed to minimize contact with stormwater.
<br />b. Pesticides, herbicides, insecticides, fertilizers, treatment chemicals, and landscape materials must be
<br />under cover (e.g., plastic sheeting or temporary roofs) to prevent the discharge of pollutants or
<br />protected by similarly effective means designed to minimize contact with stormwater.
<br />c. Hazardous materials, toxic waste, (including oil, diesel fuel, gasoline, hydraulic fluids, paint solvents,
<br />petroleum -based products, wood preservatives, additives, curing compounds, and acids) must be
<br />properly stored in sealed containers to prevent spills, leaks or other discharge. Restricted access
<br />storage areas must be provided to prevent vandalism. Storage and disposal of hazardous waste or
<br />hazardous materials must be in compliance with Minn. R. ch. 7045 including secondary containment
<br />as applicable.
<br />d. Solid waste must be stored, collected and disposed of properly in compliance with Minn. R. ch. 7035.
<br />e. Portable toilets must be positioned so that they are secure and will not be tipped or knocked over.
<br />Sanitary waste must be disposed of properly in accordance with Minn. R. ch. 7041.
<br />2. Fueling and Maintenance of Equipment or Vehicles; Spill Prevention and Response: Take reasonable
<br />steps to prevent the discharge of spilled or leaked chemicals, including fuel, from any area where
<br />chemicals or fuel will be loaded or unloaded including the use of drip pans or absorbents unless
<br />infeasible. Conduct fueling in a contained area unless infeasible. Ensure adequate supplies are available
<br />at all times to clean up discharged materials and that an appropriate disposal method is available for
<br />recovered spilled materials. Report and clean up spills immediately as required by Minn. Stat. § 115.061,
<br />using dry clean up measures where possible.
<br />3. Vehicle and equipment washing: Wash the exterior of vehicles or equipment on the project site, washing
<br />must be limited to a defined area of the site. Runoff from the washing area must be contained in a
<br />sediment basin or other similarly effective controls and waste from the washing activity must be properly
<br />disposed of. Properly use and store soaps, detergents, or solvents. No engine degreasing is allowed on
<br />site.
<br />4. Concrete and other washouts waste: Provide effective containment for all liquid and solid wastes
<br />generated by washout operations (concrete, stucco, paint, form release oils, curing compounds and other
<br />construction materials) related to the construction activity. The liquid and solid washout wastes must not
<br />contact the ground, and the containment must be designed so that it does not result in runoff from the
<br />washout operations or areas. Liquid and solid wastes must be disposed of properly and in compliance
<br />with MPCA rules. A sign must be installed adjacent to each washout facility that requires site personnel
<br />to utilize the proper facilities for disposal of concrete and other washout wastes.
<br />PERMIT TERMINATION (SECTIONS 4 AND 13)
<br />1. Permittees must submit a NOT within 30 days after all termination conditions listed in Section 13
<br />are complete.
<br />2. Permittees must submit a NOT within 30 days after selling or otherwise legally transferring the
<br />entire site, including permit responsibility for roads (e.g., street sweeping) and stormwater
<br />infrastructure final clean out, or transferring portions of a site to another party. The permittees'
<br />coverage under the permit terminates at midnight on the submission date of the NOT.
<br />3. Permittees may terminate permit coverage prior to completion of all construction activity if they
<br />meet all of the following conditions:
<br />a. Construction activityhas ceased for at least 90 days; and
<br />Y,
<br />b. at least 90 percent (by area) of all originally proposed construction activity has been completed
<br />and permanent cover has been established on those areas; and
<br />c. on areas where construction activity is not complete, permanent cover has been established;
<br />and
<br />d. the site complies with items 13.3 through 13.7 of the permit.
<br />After permit coverage is terminated under this item, any subsequent development on the remaining
<br />portions of the site will require permit coverage if the subsequent development itself or as part of
<br />the remaining common plan of development or sale will result in land disturbing activity of one (1)
<br />or more acres in size.
<br />4. Permittees may terminate coverage upon MPCA approval after submitting information
<br />documenting the owner canceled the project.
<br />5. Permittees must complete all construction activity and must install permanent cover over all areas
<br />prior to submitting the NOT. Vegetative cover must consist of a uniform perennial vegetation with a
<br />density of 70 percent of its expected final growth. Vegetation is not required where the function of a
<br />specific area dictates no vegetation, such as impervious surfaces or the base of a sand filter.
<br />6. Permittees must clean the permanent stormwater system of any accumulated sediment and must
<br />ensure the system meets all applicable requirements in Section 15 through 19 of the permit and is
<br />operating as designed.
<br />7. Permittees must remove all sediment from conveyance systems prior to submitting the NOT.
<br />8. Permittees must remove all temporary synthetic erosion prevention and sediment control BMPs
<br />prior to submitting the NOT. BMPs designed to decompose on -site may be left in place.
<br />9. For residential construction only, permit coverage terminates on individual lots if the structures are
<br />finished and temporary erosion prevention and downgradient perimeter control is complete, the
<br />residence sells to the homeowner, and the permittee distributes the MPCA's "Homeowner Fact
<br />Sheet" to the homeowner.
<br />10.For construction projects on agricultural land (e.g., pipelines across cropland), disturbed land must
<br />be returned to its preconstruction agricultural condition prior to submitting the NOT.
<br />11. When submitting the NOT, permittees must include either ground or aerial photographs showing
<br />vegetative cover requirements have been met as listed above. All submitted photographs shall
<br />include the date and specific site location.
<br />LONG TERM OPERATION AND MAINTENANCE:
<br />1. Upon the completion of construction activity and NPDES permit termination, in accordance with
<br />Sections 4 and 13, the Property Owner shall become the responsible party for long term operation
<br />and maintenance (O&M) of all permanent stormwater management features under this project.
<br />2. All associated operations, inspections, maintenance, and record keeping shall be performed by
<br />trained individual(s) familiar with the site stormwater management system.
<br />3. Record keeping of inspections and maintenance items shall be maintained by the Owner in
<br />accordance with applicable Maintenance Agreements/Declarations as required by local
<br />jurisdictional authorities.
<br />-o
<br />co
<br />0
<br />a)
<br />0
<br />co
<br />J
<br />CN
<br />LO
<br />CO
<br />0
<br />LO
<br />LO
<br />z
<br />a)
<br />co
<br />J
<br />a)
<br />m
<br />a)
<br />c
<br />c
<br />0)
<br />c
<br />.5)
<br />LO
<br />w
<br />c
<br />0
<br />as
<br />J
<br />c
<br />a)
<br />0
<br />1-
<br />U
<br />a)
<br />0
<br />0_
<br />Wz
<br />U�
<br />W
<br />12 2
<br />12
<br />W0
<br />W
<br />D 0
<br />CO
<br />UT) ^ Z
<br />W
<br />O�
<br />O
<br />O
<br />12
<br />W
<br />L:E)
<br />I hereby certify that this plan,
<br />specifications or report was prepared
<br />by me or under my direct supervision
<br />and that I am a duly Licensed
<br />Professional Engineer under the laws
<br />of the State of Minnesota.
<br />1/.a//70-1„,
<br />First M. Last, P.E.
<br />Date: 08.13.25 Lic. No.: 25520
<br />Rev. Date Description
<br />08.13.25 City Comments
<br />Project #: 12256081.000
<br />Drawn By: TRK
<br />Checked By: TJH
<br />Issue Date: 08.13.25
<br />Sheet Title:
<br />SWPPP
<br />Sheet:
<br />
|