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08.b2b CMSCWD Permit 22-023 ER_06272022Emmons & Olivier Resources, Inc. - 1 - 6/27/2022 Carnelian-Marine-St. Croix Watershed District Permit Application Number 22-023 Applicant: Jaren Johnson J. Johnson Development 612-221-1596 jarenjohnson@hotmail.com Consultants: Adam Ginkel Plow Engineering 651-361-8210 adam@plowe.com Purpose: Land Disturbance Plan for an 8-lot single-family residential development to be known as Tii Gavo Second Addition riparian to Rasmussen Pond, 10.9- acres. Location: Outlots I, J, and K of Tii Gavo, Scandia District Rule: 2, 3 & 4 Recommendation: Conditional Approval pending receipt of the following items related to: Stormwater Management 1. Soil boring, test pit or infiltrometer test for each infiltration basin (as specified in the SWPPP) to confirm design infiltration rates and adequate separation from groundwater. 2. Revised plan including inspection and restoration, as necessary, of Infiltration Basin 17 and Bioswale 1 (located at intersection of Meadowridge Trail N and Meadowridge Lane N) similar to the plans for existing Infiltration Basin B. 3. Revised Infiltration Basin Detail: a) replacing the note to mix in salvaged topsoil for top 6-inches and instead specify 2-inches of certified organic compost (MNDOT Grade 2) tilled in 6-inches, and b) revising Note 4 to specify a minimum of 18-inches of in situ soil must remain until upstream drainage is stable, and c) incorporating silt logs around perimeter of basin bottoms after tilling with compost. 4. Copy of rate control summary (Tables 1 through 4) referred to in the Stormwater Drainage Report. Erosion & Sediment Control 5. Revised ESC Plan with silt fence down gradient of Infiltration Basin 5 grading and silt logs downgradient of right-of-way swale grading at Station 33+00 Meadowridge Trail N. Permit Application No. 22-023 Tii Gavo Second Addition Emmons & Olivier Resources, Inc. - 2 - 6/27/2022 Buffers 6. Revised plan including removal of existing buffer monumentation. 7. Completion of draft Buffer Declaration. Floodplain 8. Specification of home low floor elevations in compliance with District freeboard requirements. Administrative 9. Completion of a draft Declaration for Maintenance of Stormwater Facilities for access to and maintenance of proposed stormwater feature(s). 10. Submittal of permit application fee ($5,150) and surety ($19,800). Stipulations: 1. 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. 2. Both the owner and applicant are responsible for all attorneys’ and engineers’ fees, costs or other expenses incurred by the District in enforcing the terms of the permit. This includes (but not limited to) pursuit of a court action to ensure practices are installed as approved by all parties in this executed permit. 3. Your permit is valid 2-years from the day of dated signature. You must seek permit renewal prior to your permit expiring by contacting the Permit Specialist (and/or District Administrator) at least 30 days prior to permit expiration. Permit renewals will be subject to additional fees as outlined in District Rule 1.13. Permit Application No. 22-023 Tii Gavo Second Addition Emmons & Olivier Resources, Inc. - 3 - 6/27/2022 4. You are responsible for and must notify the Permit Specialist (and/or District Administrator) of any changes to contact information throughout your open permit period for both owner and applicant (phone, email, and address). 5. Any additional contact information for the responsible erosion control contractor/site manager must be provided to the Permit Specialist (and/or District Administrator) prior to initiating work. 6. Notify Permit Specialist (and/or District Administrator) after erosion control is installed but prior to start of construction. 7. Any proposed changes to approved plans shall be submitted to the District for prior approval. Proposed changes include but are not limited alterations to impervious cover, stormwater management practices, buffers, landscaping, and erosion control, wetlands, and floodplains. Permit amendments are subject to additional fees as outlined in District Rule 1.13. 8. Applicant is responsible for obtaining all other required permits and approvals for construction of proposed project. 9. Install and maintain silt fence down-gradient from all proposed disturbed soil prior to start of any construction. 10. Upon approval by the District of the draft maintenance agreement and buffer declaration, the documents 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. 11. Stabilization must be initiated immediately to limit soil erosion on any portion of the site when construction activity has permanently ceased or will not resume for a period exceeding fourteen Permit Application No. 22-023 Tii Gavo Second Addition Emmons & Olivier Resources, Inc. - 4 - 6/27/2022 (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. 12. Notify Permit Specialist (and/or District Administrator) after completion of work for final inspection and return of surety. 13. Applicant shall not alter or disturb the existing shoreline of Rasmussen Pond. 14. Earthen fill below the 100-yr flood elevation of Rasmussen Pond is not authorized as part of this permit. 15. Per District Permit 06-019, all lots within Tii Gavo are to be individually permitted and must address stormwater on a lot-by-lot basis in addition to the regional features already constructed. Per the requirements of the Tii Gavo Pro Forma agreement, a minimum of 450 CF of stormwater management storage is required for each lot, but more storage may be required based on completion of the District’s Small Residential Project Stormwater Worksheet. Exhibits: 1. Permit application dated 6/1/2022 and received 6/1/2022. 2. Certificate of Survey prepared by E.G. Rud & Sons, Inc., last revised 6/13/2022, received 6/22/2022. 3. Preliminary Plat prepared by E.G. Rud & Sons, Inc., last revised 6/13/2022, received 6/22/2022. 4. Aerial Resource Inventory prepared by E.G. Rud & Sons, Inc., dated 6/13/2022, received 6/22/2022. 5. Construction Plans (10 sheets) prepared by Plowe Engineering, Inc., Permit Application No. 22-023 Tii Gavo Second Addition Emmons & Olivier Resources, Inc. - 5 - 6/27/2022 dated 6/1/2022, received 6/1/2022. 6. Stormwater Drainage Report prepared by Plowe Engineering, Inc., dated 6/1/2022, received 6/1/2022. 7. NRCS Custom Soils Report dated 3/17/2022, received 6/1/2022. 8. WCA NOD for Wetland Boundary and Type, dated 2/3/2022, received 6/22/2022. 9. Wetland Delineation Report prepared by Earth Sciences Associates, Inc., last revised 11/29/2021, received 6/22/2022. 10. MnRAM Wetland Management Category Map prepared by Earth Sciences Associates, Inc., last revised 11/27/2021, received 6/1/2022. 11. CMSCWD Permit files 06-018 (Tii Gavo Access Road), 06-019 (Tii Gavo First Addition), and 14-016 (Tii Gavo Pro Forma). Findings: 1. Description – The proposed project includes an 8-lot single-family residential development to be known as Tii Gavo Second Addition. Proposed improvements include mass grading, storm sewer installation, construction of stormwater BMPs, construction of streets and right-of-way ditches, and site restoration. Lots will be custom graded (in future) and will require additional District permitting for compliance with District stormwater management and erosion and sediment control rules. 2. Stormwater Management – The proposed stormwater management plan includes 6 new infiltration basins and use of 3 existing infiltration features constructed with the First Addition. The proposed plan meets all District stormwater management standards for volume control, water quality treatment, and rate control. Minor additions and revisions are detailed in pending items. 3. Erosion & Sediment Control – An adequate erosion and sediment control plan has been provided and includes a SWPPP, a rock construction entrance, inlet protection for existing catchbasins, and silt fence downstream of disturbed areas, revegetation specifications, and a construction implementation schedule. Minor additions are noted in pending items. 4. Buffers – Buffers were previously established for the Second Addition with the overall platting of Tii Gavo. Revisions to buffer widths are proposed throughout the Second Addition utilizing buffer averaging flexibility. However, in all cases the proposed buffer widths meet or Permit Application No. 22-023 Tii Gavo Second Addition Emmons & Olivier Resources, Inc. - 6 - 6/27/2022 exceed minimum requirements and afford more buffer area than originally recorded. 5. Floodplain – The 100-yr flood elevation of Rasmussen Pond is 947.1 (FEMA). There is no proposed floodplain fill. Revised plans are required specifying the minimum low floor elevation for each lot with respect to governing flood elevations and overflows. Low floors must be a minimum of 2-ft above the 100-yr high water elevation (3-ft for Rasmussen Pond which is landlocked) and at least 1-ft above the EOF of the highest applicable (infiltration or wetland) basin. 6. Wetlands – The approved wetland delineation report identifies seven wetland basins ranging from District Management Category 1 to Management Category 3 within or adjacent to the Second Addition. The proposed construction will not alter onsite or adjacent wetlands. Therefore, this rule is not applicable. Board Action: The CMSCWD Board will consider this application at their July 13th, 2022 Board meeting.