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C-205
<br />SWPPP
<br />DRW25001
<br />PROJECT NO.
<br />PRELIMINARY PLAT,
<br />SITE PLAN, AND
<br />REZONING REVIEW
<br />04/20/26
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<br />CERTIFICATION
<br />REVISION DATE
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<br />PROJECT
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<br />C I V I L E N G I N E E R I N G | L A N D S C A P E A R C H I T E C T U R E
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<br />I hereby certify that this plan, specification
<br />or report was prepared by me, or under my
<br />direct supervision, and that I am a duly
<br />Licensed Professional Engineer under the
<br />laws of the state of MINNESOTA.
<br />Stephen M. Johnston
<br />18914 04/20/2026
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<br />REGISTRATION NO.
<br />DATE
<br />ONEKA LAKE
<br />RESERVE
<br />HUGO, MN
<br />ONEKA LAKE, LLC
<br />DON WILLENBRING
<br />2120 WUTHERING
<br />HEIGHTS ROAD
<br />EAGAN, MN 55122
<br />651-363-3915
<br />PROJECT NAME / LOCATION
<br />PROJECT NAME ONEKA LAKE RESERVE
<br />PROJECT ADDRESS GENERATION AVENUE N & 150TH STREET N
<br />PROPERTY ID 1703121440148
<br />LATTITUDE/LONGITUDE 45.16798N, -92.98322W
<br />EROSION PREVENTION MEASURES - GENERAL
<br />The Contractor (Operator) is responsible for all erosion prevention measures for the project including but are not
<br />limited to the following:
<br />1.The Contractor (Operator) shall plan and implement appropriate construction practice and construction
<br />phasing to minimize erosion and retain vegetation whenever possible
<br />2.All areas not to be disturbed shall be delineated with flags, stakes, signs, or other means necessary to
<br />protect these areas before construction begins on the site.
<br />3.All drainage ditches and/or swales shall have temporary or permanent stabilization within 24 hours of
<br />connecting to a surface water or 24 hours after construction activity in the ditch/swale has temporarily or
<br />permanently ceased.
<br />4.All pipe outlets shall have temporary or permanent energy dissipation within 24 hours of connecting to a
<br />surface water.
<br />5.All exposed soils shall be stabilized as soon as possible to limit soil erosion. In no case shall un-worked areas,
<br />including stockpiles, have exposed soils for more than 7 days without providing temporary or permanent
<br />stabilization.
<br />SEDIMENT CONTROL MEASURES AND TIMING - GENERALS
<br />The Operator (Contractor) is responsible for all sediment control measures for the project. Sediment control
<br />measures include but are not limited to the following:
<br />1.Sediment control measures shall be established on all down gradient perimeters before any up-gradient land
<br />disturbing activities begin. These measures shall remain in place until final stabilization has been established.
<br />2.On slopes with 3:1 or steeper grades there shall be no unbroken slope length greater than 75 feet.
<br />3.All storm drain inlets and culvert inlets shall be protected by an appropriate BMP during construction until
<br />all sources with potential for discharging to the inlet has been stabilized. Inlet and culvert protection shall
<br />conform to the MnDOT Specifications 2573 and 3891.
<br />4.Stockpiles shall be provided with an effective sediment perimeter control and shall not be placed in any type
<br />of surface water or drainageway.
<br />5.Vehicle tracking shall be minimized with effective BMP's. Where the BMP's fail to prevent sediment from
<br />tracking onto streets the Contractor shall conduct street sweeping to remove all tracked sediment.
<br />6.The Operator is responsible for identifying the need for temporary sediment basins based on actual field
<br />conditions to protect downstream resources. Temporary sediment basins shall be constructed before up
<br />gradient vegetation is disturbed and maintained until the risk of damage to downstream resources is
<br />mitigated by other means.
<br />DEWATERING AND BASIN DRAINING ACTIVITIES - GENERAL
<br />The Operator is responsible for adhering to all dewatering and surface drainage regulations, including but not
<br />limited to the following:
<br />1.Whenever possible water from dewatering activities shall discharge to a temporary and/or permanent
<br />sediment basin.
<br />2.If water cannot be discharged to a sedimentation basin, it shall be treated with other appropriate BMP's, to
<br />effectively remove sediment.
<br />3.All discharge points shall be protected from erosion and scour.
<br />4.Discharge water shall be dispersed over an effective energy dissipation measure.
<br />5.All water from dewatering shall be discharged in a manner that does not cause nuisance conditions, erosion,
<br />or inundation of wetlands. Water shall not be discharged to adjacent residential properties. It must be
<br />discharged to the public street.
<br />FINAL STABILIZATION - GENERAL
<br />The Operator is responsible for ensuring final stabilization of the site, including but is not limited to the following:
<br />1.All soil disturbing activities outside of the right-of-way have been completed.
<br />2.All exposed soils have been uniformly stabilized.
<br />3.All drainage ditches, ponds and all storm water conveyance systems have been cleared of sediment and
<br />stabilized to preclude erosion.
<br />Upon approval of the work by Owner and City, the responsibility for the site may be transferred to the City's
<br />Contractor and builders. The original Contractor will remain responsible for establishment of at least 80%
<br />perennial vegetation coverage and the removal of temporary BMP's.
<br />TEMPORARY SEDIMENT BASIN
<br />The Contractor shall limit the amount of the site that is susceptible to erosion at any given time by phasing the
<br />work. Permanent Infiltration facilities can be used as temporary storage basins prior to installing sand and
<br />Infiltrationmedia. Do not excavate beyond design subgrade elevations. After temporary storge need is over, the
<br />permanent Infiltration facilities should be constructed according to plans. Sediment shall be properly removed
<br />from the basins prior to excavation to design subgrade elevations. Do not allow compaction of the soils and
<br />operation of heavy machinery in Infiltration areas.
<br />CONSTRUCTION SEQUENCING - GENERAL
<br />Contractor shall comply with the following sequence. The Contractor may adjust the sequence if needed to
<br />address their means and methods and unanticipated field conditions.
<br />1.Install perimeter erosion and sediment control measures, tree protection fencing, and construction
<br />entrance. Erosion and sediment control BMPs shall be installed and maintained as specified in the general
<br />notes of this SWPPP and the Construction Details.
<br />2.Proceed with demolition per C010.
<br />3.Dredge to expand the existing stormwater basin as shown on the drawings. Stockpile dredged material to
<br />allow it to dry to a suitable store level for use as embankment within the project.
<br />4.Strip and stockpile topsoil. Stabilize with temporary seed and mulch, and surround with an erosion control
<br />blanket.
<br />5.Begin installation of utilities.
<br />6.Begin building construction.
<br />7.Pave street, sidewalks, and driveways.
<br />8.Finish utility installation. As inlets are completed, establish inlet protection.
<br />9.Finish buildings.
<br />11.Flush storm sewer system, remove sediment from sumps.
<br />12.Replace inlet protection that is full, replace any damaged sections of perimeter BMPs until final stabilization
<br />has been achieved.
<br />13.Begin Final Stabilization. Install landscaping, sod, and seed. Monitor vegetation growth, replace dead
<br />vegetation as needed. When 90% of the vegetative cover has been established, remaining erosion and
<br />sediment control BMPs may be removed.
<br />14.File NPDES Notice of Termination (“NOT”) with MPCA within 30 days of final stabilization.
<br />INSPECTION AND MAINTENANCE
<br />All inspections, maintenance, repairs, replacements, and removal are to be considered incidental to the BMP bid
<br />items.
<br />The Contractor (Operator) is responsible for completing required inspections maintenance and observation of
<br />weather conditions and rainfall amounts to ensure compliance with the permit requirements. The Contractor
<br />(Operator) shall observe the construction site once every seven (7) days during active construction and within 24
<br />hours after a rainfall event greater than 0.5 inches in 24 hours.
<br />The Contractor (Operator) shall keep a summary maintenance/construction observation report to be recorded
<br />after each site visit/observation. The Contractor (Operator) shall submit a copy of the written inspections monthly
<br />to the Owner. Records shall include the following:
<br />1.Date and time of inspections
<br />2.Name of person conducting inspection
<br />3.Findings and recommendations for corrective actions if necessary
<br />4.Corrective actions taken
<br />5.Date and number of rainfalls greater than 0.5 inches in 24 hours
<br />6.Record, photograph, and describe the location of any observed discharge (i.e., color, odor, settled or
<br />suspended solids, oil sheen, and other obvious indicators of pollutants)
<br />7.Photographs of dewatering activities and documentation of nuisance conditions resulting from dewatering
<br />activities
<br />8.Record any amendments or changes made to the SWPPP
<br />9.A site map indicating active construction areas and land disturbing activities.
<br />The Contractor (Operator) must keep the SWPPP, all inspection reports and amendments onsite. The Contractor
<br />(Operator) shall designate a specific location to keep the records whenever construction activity is in progress.
<br />All erosion prevention and sedimentation 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 Contractor
<br />(Operator) must investigate and comply with the following inspection and maintenance requirements:
<br />1.All sediment barriers including silt fence, bio-logs, and similar devices must be repaired replaced or
<br />supplemented when they become nonfunctional, or the sediment reaches 1/3 of the barrier height. These
<br />repairs shall be made within 24 hours of discovery.
<br />2.Temporary and permanent sediment basins must be drained, and the sediment removed when the depth of
<br />sediment collected in the basin reaches 1/2 the storage volume. Drainage and removal must be completed
<br />within 72 hours of discovery.
<br />3.Surface waters, including drainage ditches and conveyance systems, must be inspected for evidence of
<br />erosion and sediment deposition. The Operator shall remove all deltas and sediment deposited in surface
<br />waters, including drainage ways, catch basins, and other drainage systems. The Operator shall re-stabilize
<br />the areas where sediment removal results in exposed soil. Removal and stabilization must take place within
<br />7 days of discovery, unless precluded by legal, regulatory or physical constraints. The Contractor (Operator)
<br />is responsible for contacting all local, regional, state and federal authorities and receiving any applicable
<br />permits, prior to conducting any work.
<br />4.Construction site vehicle exit locations shall be inspected daily for evidence of off-site sediment tracking
<br />onto paved surfaces. Tracked sediment must be removed from all paved surfaces within 24 hours of
<br />discovery.
<br />5.The Contractor (Operator) is responsible for the operation and maintenance of temporary and permanent
<br />water quality BMP's. As well as erosion and sediment control BMP's for the duration of the construction
<br />work at the site.
<br />6.If sediment escapes the construction site, all off-site accumulations of sediment must be removed in a
<br />manner and at a frequency sufficient to minimize off-site impacts.
<br />7.All Infiltration areas must be inspected to ensure that no sediment from ongoing construction activities is
<br />reaching the Infiltration areas and these areas are protected from compaction due to construction
<br />equipment driving across the Infiltration area.
<br />8.The Contractor is solely responsible for all costs associated with reconstructing the BMP when the
<br />functionality is compromised by the Contractor's actions or inaction to protect the BMP.
<br />POLLUTION PREVENTION MANAGEMENT MEASURES
<br />The Contractor (Operator) shall be responsible for all pollution prevention management measures. The
<br />Contractor (Operator) is responsible for informing all visitors and/or personnel on-site of the pollution prevention
<br />management measures.
<br />All pollution prevention management measures are to be considered incidental to the overall project bid, unless
<br />otherwise noted. Pollution prevention management measures include but are not limited to the following:
<br />1.The Contractor (Operator) is responsible for the proper disposal, in compliance with MPCA disposal
<br />requirements, of all solid or liquid waste and hazardous materials on-site.
<br />2.Concrete trucks shall not be allowed to wash out or discharge surplus concrete or drum wash water on-site,
<br />unless done in an engineered leak-proof containment system. The engineered system provided by the
<br />Contractor (Operator) must include site drawings for the project file and written assurance that the system
<br />will work as designed and leave no discharge of concrete or concrete residue potential to waters of the state
<br />during a minimum of a 100-year storm event. A sign must be installed adjacent to each washout system to
<br />inform concrete equipment Operators to utilize the proper facilities. The concrete washout containment
<br />system and all related items shall be considered incidental to the project bid.
<br />3.All nonhazardous waste materials shall be collected and stored in a securely lidded metal dumpster or other
<br />approved containment method at the end of each day. Any alternative to a metal dumpster must be
<br />submitted in writing for approval by the project engineer. The dumpster shall be emptied as necessary to
<br />function as intended for debris collection. No construction garbage or waste material shall be buried on-site.
<br />4.A licensed sanitary waste management Contractor shall collect all sanitary waste from the portable units at a
<br />rate necessary to maintain designed function.
<br />5.All fertilizers shall be stored in a covered shelter. Partially used bags shall be transferred to a sealable bin to
<br />reduce the chance of spillage.
<br />6.External washing of trucks and other construction vehicles and engine degreasing are prohibited at the
<br />construction site. All vehicles on-site shall be monitored for leaks and receive regular prevention
<br />maintenance to reduce the chance of leakage. Petroleum products shall be stored in tightly sealed
<br />containers. Which are clearly labeled. Spill kits shall be included with all fueling sources and maintenance
<br />activities. Secondary containment measures shall be installed and maintained by the Operator.
<br />7.Any asphalt substances used on-site shall be applied in accordance with manufacturer's recommendations.
<br />8.All paint containers and curing compounds shall be tightly sealed and stored when not required for use.
<br />Excess paint and/or curing compounds shall not be discharged into the storm sewer system and shall be
<br />properly disposed of according to manufacturer's instruction.
<br />9.Materials and equipment necessary for spill clean-up shall be kept in an enclosed trailer or shed on-site.
<br />Equipment shall include. But not limited to, brooms, mops, dust pans, rags, gloves, goggles, absorbent (kitty
<br />litter) oil absorbent booms and diapers and buckets.
<br />10.All spills shall be contained and cleaned up immediately upon discovery. Spills large enough to reach the
<br />storm water conveyance system shall be reported to the Minnesota duty officer at 1-800-422-0798.
<br />CONTACTS
<br />OWNER
<br />DON WILLENBRING
<br />ONEKA LAKE, LLC
<br />2120 WUTHERING HEIGHTS ROAD
<br />EAGAN, MN 55122
<br />PHONE#
<br />(651) 363-3915
<br />CONTRACTOR/OPERATOR
<br />TBD
<br />NAME/CONTACT
<br />COMPANY
<br />ADDRESS
<br />PHONE#
<br />EMAIL
<br />PREPARER
<br />KALLY HALUPTZOK
<br />ÉLAN DESIGN LAB, INC.
<br />310 4TH AVE S
<br />SUITE 1006
<br />MINNEAPOLIS, MN 55415
<br />612-260-7979
<br />KHALUPTZOK@ELANLAB.COM
<br />SWPPP DESIGN CERTIFICATION
<br />EXPIRES 2027
<br />GENERAL SWPPP RESPONSIBILITIES
<br />The Contractor (Operator) shall provide a knowledgeable and experienced person(s) to oversee the implementation of the
<br />SWPPP and the installation. Inspection and maintenance of the erosion and sediment control BMP's before and during
<br />construction. The responsible individual shall maintain current Construction Installer and Construction Site Manager
<br />certification. Copies of current certification documents must remain on-site with the SWPPP. The Certified person must be
<br />available on-site within 24 hours.
<br />Both the Owner and Contractor (Operator) shall be responsible for the proper termination and/or transfer of the permit.
<br />The Owner will be responsible for the long-term operation and maintenance of the permanent storm water management
<br />system(s).
<br />Unless specifically stated the engineer shall have no responsibility for any SWPPP activities during or after construction.
<br />PROJECT DESCRIPTION
<br />The vacant 6.7 acre project site is located north of 150th Street North at Generation Avenue.
<br />The proposed development includes a 50 attached townhomes, in two, three, and four-unit buildings, served by a private street.
<br />Stormwater management is provided by a series of infiltration basins that overflow to an open water retention pond in the
<br />northeast corner of the site.
<br />SOILS
<br />The generalized soil mapping provided by the USDA/NRCS indicates that approximately 40% of the soils are Isanti fine sand
<br />loam, 40% are Lino loamy fine sand and 20% Lino variant fine sand. All of these soils types consist of, in varying degrees, loamy
<br />fine sand and fine sand. “B” hydrologic soil group (HSG) has been used for all calculations.
<br />The geotechnical investigation and report prepared by NTI that indicates the presence of a thin layer of topsoil over silty sand
<br />(SM), poorly graded sand with silt (SP-SM) and poorly graded sand (SP). Shallow groundwater will be encountered.
<br />RECEIVING WATERS
<br />The site directly drains to a regional NURP pond on the North side of the property. The project is within a mile proximity to
<br />Oneka and Egg Lakes, and Hardwood Creek.
<br />MAP OF SURFACE WATERS
<br />MAP OF MPCA IMPAIRED AND SPECIAL WATERS
<br />PROJECT PLANS
<br />The following plan sheets are hereby incorporated into this SWPPP
<br />DESCRIPTION DATE
<br />C200
<br />SHEET NUMBER
<br />Overall Grading and Erosion and Sediment Control Plans
<br />C201, C202, C203, C204 Grading Plan Areas 1-4
<br />C301 Utility Plan 04/20/2026
<br />C501 - C505 Details
<br />04/20/2026
<br />04/20/2026
<br />04/20/2026
<br />STORMWATER RELATED REVIEWS AND PERMITS
<br />TYPE OF PERMIT REVIEW STATUS
<br />City of Hugo
<br />AGENCY
<br />Site Plan Review, Stormwater Management, Erosion and Pending
<br />Sediment Control, Grading Permit, Building Permit
<br />MPCA Construction Stormwater To be acquired by
<br />contractor
<br />STORMWATER MANAGEMENT SYSTEM OVERVIEW
<br />See Stormwater Management Plan incorporated herein by reference for details on system design, flow rates and volumes
<br />and system capacities. The existing NURP pond to the north will be expanded and will be the primary discharge point from
<br />the site. Stormwater will be utilized for irrigation within the development. See Operations and Maintenance Manual for
<br />post construction system maintenance requirements.
<br />QUANTITIES
<br />QUANTITY *
<br />SILT FENCE
<br />PRACTICE
<br />2,085
<br />DETAIL/SPEC.UNIT
<br />A1/C-503 LF
<br />POST CONSTRUCTION OPERATION AND MAINTENANCE
<br />Maintenance of the storm water management facilities will be the responsibility of an Owner and will be subject to an
<br />agreement with Minnehaha Creek Watershed District.
<br />Owner must make the SWPPP, including all inspection reports, maintenance records, training records and other
<br />information required by this permit, available to federal, state, and local officials within three (3) days upon request
<br />for the duration of the permit and for three (3) years following the NOT.
<br />AMENDMENTS TO THE SWPPP
<br />The SWPPP will be amended as needed and/or as required by provisions of the permit. Amendments will be approved
<br />by both the Owner and Contractor (Operator) and will be attached to the SWPPP as an additional sheet. The SWPPP
<br />and amendments will be kept on site by the Contractor (Operator) whenever construction activity is in progress.
<br />The SWPPP must be amended within 7 days to include additional or modified BMPs as necessary to correct problems
<br />identified or address situations whenever there is a change in design, construction, operation, maintenance, weather
<br />or seasonal conditions having a significant effect on the discharge of pollutants to surface waters or groundwater or
<br />whenever inspections or investigations by the site owner operator, USEPA or MPCA officials indicate the SWPPP is not
<br />effective in eliminating or significantly minimizing the discharge of pollutants to surface waters or groundwater or the
<br />discharges are causing water quality standard exceedances.
<br />*Quantities are minimums and are not intended to be used for purposes of bidding. The contractor shall
<br />provide ESC BMPs as shown on the drawings and shall repair, replace, and supplement BMPs throughout
<br />construction as required to comply with the SWPPP and the construction stormwater permit.
<br />Rice Creek Watershed District
<br />TURBIDITY CURTAIN 155C1/C-503 LF
<br />DITCH CHECK 7C6/C-503 EACH
<br />CONSTRUCTION ENTRANCE 1A4/C-503 EACH
<br />INLET PROTECTION 17C3C-503 EACH
<br />TREE PROTECTION FENCE 440D1/C-503 LF
<br />RIPRAP SPILLWAY 3C1/C-505 EACH
<br />EROSION CONTROL BLANKET 33,660A2/C-503 SF
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