4. CMSCWD Permit 18-007 ER_052418Emmons & Olivier Resources, Inc. - 1 - 5/24/18
Carnelian-Marine-St. Croix Watershed District Permit Application Number 18-007
Applicant: Pat Reicherts
Big Marine Lake Store
19261 Manning Trail N
Marine on St. Croix, MN 55047
614-557-4475
twincitie@yahoo.com
Consultants: Todd Shoemaker
Wenck Associates
1802 Wooddale Drive
Woodbury, WI 55125
651-294-4580
tshoemaker@wenck.com
Purpose: Land Disturbance Plan for additions to existing building, expanded
parking, and stormwater improvements for Big Marine Lake Store in
Marine on St. Croix, MN.
Location: 19261 Manning Trail N, Marine on St. Croix.
District Rule: 2 & 3
Recommendation: Conditional Approval pending receipt of the following items
related to:
Stormwater Management
1. Soil boring at the proposed infiltration basin location with a
minimum depth of 5-feet below the basin final grade and
grainsize (and hydrometer analysis if SM or tighter soils are
encountered) for each soil layer.
2. Revised HydroCAD model, and stormwater management plan
as necessary, per the following:
a. Revised existing conditions model with a CN of 30 for all
proposed disturbed areas given onsite soils are HSG A,
per Rule 2.5.3(b).
b. Revised proposed conditions model with a CN of 44 for
disturbed areas proposed to be pervious, per Rule
2.5.3(d).
c. Revised existing and proposed conditions models with a
distributed CN-value approach; per Rule 2.5.3(c) (i.e.
composite curve numbers are not accepted).
3. Field inspection by District Engineer and evaluation of existing
stormwater management features given history of Permit 03-
044 and no apparent resolution of deficiencies noted in the file.
Permit Application No. 18-007 Big Marine Lake Store Improvements
Emmons & Olivier Resources, Inc. - 2 - 5/24/18
4. Revised plan, if necessary, addressing any deficiencies
identified in existing stormwater BMPs.
Administrative
5. Completion of a draft Declaration for Maintenance of
Stormwater Facilities for access to and maintenance of
proposed stormwater features (see attached District template).
6. Performance surety in the amount of $4,200 (in cash form).
7. Final Plans signed by Professional Engineer.
Stipulations: 1. Contact information for the responsible erosion
control contractor/site manager must be
provided to the District Administrator prior to
initiating work.
2. Notify District Administrator after erosion
control is installed but prior to start of
construction.
3. All work shall be in accordance with the
approved design, plans, computations and
specifications on file with the Carnelian-
Marine-St. Croix Watershed District and any
stipulations identified in this permit. Any
proposed revision to grading drainage,
landscaping and erosion control plans shall be
submitted to the District for prior approval.
4. Applicant is responsible for obtaining all other
required permits and approvals for construction
of proposed project.
5. Install and maintain silt fence down-gradient
from all proposed disturbed soil prior to start of
any construction.
6. Upon approval by the District of the draft
maintenance agreement, the document shall be
executed and recorded at the County on the
deed. Submit certified copy to District within
60 days of notice of District approval of draft
agreement.
Permit Application No. 18-007 Big Marine Lake Store Improvements
Emmons & Olivier Resources, Inc. - 3 - 5/24/18
7. Seed and mulch all disturbed soil within 14 days
of the end of construction activities.
8. Notify District Administrator after completion
of work for final inspection and return of surety.
9. The permittee shall supply an as-built survey
within 35 days of project completion. The
District shall review this survey as a part of the
certificate of completion for the project.
Exhibits: 1. Permit Application dated 5/8/18, received 5/8/18.
2. Permit Application fee ($2,500) received from Pat Reicherts, on
5/8/18.
3. Preliminary Plan Set (7 sheets) prepared by Wenck Associates, last
revised April 2018, received 5/3/18.
4. Technical Memo prepared by Wenck Associates, dated 4/26/18,
received 5/3/18.
5. Soil Profile & Location Map prepared by Wenck Associates, dated
5/10/18 and 5/14/18, respectively, received 5/14/18.
6. CMSCWD Permit File 03-044.
Findings: 1. Description – The proposed project entails constructing additions to
the existing building, replacing an existing driveway with permeable
pavers, expanding the parking lot, and additional stormwater
improvements. The site is 2.13 acres in size, with 0.91 acres of
existing impervious. The proposed project would result in 0.32 acres
of additional impervious surface and disturbance of 0.57 acres.
2. Stormwater Management – It does not appear that the calculation of
impervious surfaces followed the definition provided in the
CMSCWD Rules in that, by definition, gravel is an impervious
surface. Regardless, it is clear less than 50 percent of the existing
impervious is disturbed such that the redevelopment criteria is not
triggered and the stormwater management criteria apply only to the
new and reconstructed impervious surfaces.
Stormwater management will be provided through the use of
permeable pavers in the northwest corner of the site, which drain to
an existing raingarden; and an infiltration basin, which will be
graded in the northeast corner of the site and overflows into an
Permit Application No. 18-007 Big Marine Lake Store Improvements
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existing dry pond. A 3-foot buffer strip around the edge of the
proposed parking lot provides pretreatment for the new lot. The
pervious pavers provide pretreatment for runoff from the roof of the
new building. Stormwater calculations were developed in
HydroCAD, while the buffer strip was analyzed using a P8 model.
It appears the stormwater management plan is consistent with
District stormwater management standards; however, modeling
revisions noted in the pending items are required for review and
verification.
3. Erosion & Sediment Control – A satisfactory erosion and sediment
control plan has been submitted.
4. Floodplain – The EOF of the proposed infiltration basin and existing
dry basin is approximately 976, well below the low entry elevation
of the store thereby satisfying District freeboard requirements.
5. Wetlands – Based on the District’s CWPMP wetland inventory,
there are no known wetlands on site; District Rule 8.0 does not
apply. However, it should be noted that the site drains to a Category
1 wetland (82-211W) east of the site. This wetland is a groundwater-
dependent natural resource.
Board Action: