5. Swenson_Draft CMSCWD Permit 20-021CARNELIAN -MARINE -ST. CROIX WATERSHED DISTRICT
PERMIT 20-021
Permission is hereby granted to do the work proposed at 18590 Norell Ave N, Scandia, in
application number CMSCWD 20-021, a copy of which is attached, in accordance with the rules
and Plan of the District; subject to the following provisions:
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 sta rt 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 shall not alter or disturb the existing shoreline of Big Marine Lake.
5. Applicant is responsible for obtaining all other required permits and approvals for
construction of proposed project.
6. Install and maintain silt fence down-gradient from all proposed disturbed soil prior to start of
any construction.
7. Upon approval by the District of the draft maintenance agreement and buffer declaration,
the document shall be executed and recorded at the County on the deed. Submit certified
copies to the District within 60 days of notice of District approval of draft agreements.
8. Stabilization must be initiated immediately to limit soil erosion on any porti on of the site
when construction activity has permanently ceased or will not resume for a period exceeding
fourteen (14) calendar days. Stabilization must be completed no later than fourteen (14)
calendar days after the construction activity in that portion of the site has ceased. Stabilization
must be completed no later than twenty-four (24) hours after the construction activity has
ceased in that portion of the site within two hundred (200) lineal feet of and draining to a
wetland, waterbody, a discernable surface drainage feature or a stormwater system inlet.
9. Notify District Administrator after completion of work for final inspection and return of
surety.
Findings:
CARNELIAN -MARINE -ST. CROIX WATERSHED DISTRICT
PERMIT 20-021
1. Description – The proposed project entails expanding an existing cabin into a year-round
residence, and constructing a new driveway and garage at 18590 Norell Ave N, resulting in
1,328 SF of new impervious surface for a total of 4,949 SF (24.97%) of impervious on site.
2. Stormwater Management – Based on the amount of new impervious surface, 199 CF of
stormwater storage is required. The proposed stormwater management plan includes a turf
infiltration area covering approximately 1,100 SF, with 440 CF of storage satisfying District
stormwater management criteria. This turf area will be amended with 2-inches of compost
tilled 6-inches deep. The proposed driveway and cabin additions are noted to be sloped to
direct runoff to this infiltration area. A proposed berm (944.0) along the south property line
directs runoff to Big Marine Lake away from the adjacent lot.
3. Erosion & Sediment Control – An acceptable erosion and sediment control plan has been
provided.
4. Buffers – In order to implement the proposed plan, Scandia would need to approve a
variance from its shoreland ordinance for shoreline setback therefore the District’s Buffer Rule
applies. Big Marine Lake is a Groundwater-Dependent Natural Resource, requiring a 100-foot
buffer. However, Rule 4.9.4 (exception for nonconforming setback) reduces buffer width to a
minimum of 10-feet (50% of the existing distance between the structure and the OHWL
(942.2)). If the variance is approved by Scandia, the District will require a buffer and recorded
buffer declaration. The proposed lake buffer area on the Certificate of Survey satisfies District
Rules.
5. Floodplain – The lowest proposed low floor elevation (new garage; 944.9) meets District 2-
foot separation from the 100-year flood elevation of Big Marine Lake (942.5).
6. Wetlands – Big Marine Lake is considered a Manage 2 wetland. No proposed activities
disturb the wetland; District Rule 8.0 does not apply.
The CMSCWD Board conditionally approved this application at their August 12, 2020 Board meeting.
The Board reserves the right to review and revise these special provisions as circumstances may require. This permit may be
suspended for failure to comply with the above stated provisions. Notification to the Board is required upon project
completion. Please reference the above application number.
Approved______________________ __________________________________
Date Administrator
Carnelian-Marine-St. Croix
Watershed District
Accepted_________________________________
Property Owner