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5.a Staff Report Meeting Date: 4/1/2008 Agenda Item: Qc, 7_3 v-- Planning Commission/City Council Agenda Report City of Scandia 14727 209th St. North Scandia, MN 55073 (651) 433-2274 Action Requested: Approve the application of John and Sandra Swanson for Final Plat approval of the Old Marine Estates minor subdivision/ preliminary plat to create three lots at 11980 Lakamaga Trail. Deadline/ Timeline: 60-day review period expires May 16, 2008. Background: • The planner will present the attached report and recommendations at the meeting. • The preliminary plat was approved on November 6, 2007. • After the planner's report was prepared, comments were submitted by the engineers for the Carnelian-Marine-St. Croix Watershed District (CMSCWD.) There are some concerns about this letter as it references rules that are not yet adopted. Recommendation: The planner has recommended approval of the final plat with conditions that have been incorporated into a draft resolution for approval. Condition number 3 has been revised from the planner's recommendation to clarify that a no grading shall occur until a permit, if required, has been issued by the Carnelian Marine Saint Croix Watershed District pursuant to their rules in effect on the date of final plat approval. Attachments/ • Draft Resolution Approving Final Plat Materials provided: • TKDA Memo dated March 27, 2008 • Letter from Washington County Dept. of Public Health & Environment dated December 19, 2007 • TKDA Memo dated November 30, 2007 re: Woodland Preservation Plan • Memo from City Engineer dated March 24, 2008 • Memo from EOR to CMSCWD Board of Managers dated March 27, 2008 • Final Plat Graphics Contact(s): John and Sandra Swanson, 651 433-5674 Prepared by: Anne Hurlburt, Administrator (swanson subdivision) Page 1 of 1 03/28/08 • CITY OF SCANDIA, MINNESOTA RESOLUTION NO. 04-01-08-01 APPROVING OLD MARINE ESTATES FINAL PLAT WHEREAS, John and Sandra Swanson have made application for a minor subdivision, final plat to create three lots at 11980 Lakamaga Trail, to be known as "Old Marine Estates"; and WHEREAS, the property is legally described as follows: That part of the South Half (S 1/2) of Government Lot Two (2) and that part of Government Lot One (1), both in Section Twenty-nine (29), Township Thirty-two (32) North, Range Twenty (20) West, Washington County, Minnesota, described jointly as follows: Commencing at a Washington County cast iron monument at the northeast corner of said Government Lot 2; thence South 00 degrees 14 minutes 58 seconds West, bearing oriented to the Washington County Coordinate System, North Zone, along the east line of said Government Lot 2 a distance of 651.80 feet to the northeast corner of said South Half of Government Lot 2, as determined by proportionate measurement along said east line, between the southeast corner of said Government Lot 2 and the point of beginning; thence South 89 degrees 53 minutes 01 seconds West along the north line of said South Half of Government Lot 2, as defined by a mean bearing between the south line and the north line of said Government Lot 2, a distance of 972.46 feet to the center line of Lakamaga Trial North as presently monumented; thence South 35 degrees 37 minutes 45 second West along said center line, 9.02 feet to a '/2 inch inside diameter iron pipe monument; thence South 44 degrees 26 minutes 34 seconds West along said center line 74.64 feet; thence South 29 degrees 49 minutes 21 seconds East 604.67 feet; Resolution No.: Page 2 of 4 thence South 46 degrees 54 minutes 11 seconds West 773.48 feet to an in place '/2 inch inside diameter iron pipe monument; thence continuing South 46 degrees 54 minutes 11 seconds West 62 feet, more or less, to the Normal Ordinary High Water line of Big Marine Lake; thence northwesterly and northerly along said line 820 feet, more or less, to the west end of a line hereinafter described as "Line A". thence South 89 degrees 10 minutes 02 seconds East, along said "Line A", as distance of 163 feet, more or less, to the east end of said "Line A", said east end being the southwest end of a line hereinafter described as "Line B"; thence North 25 degrees 37 minutes 58 seconds East, along said "Line B", a distance of 242.52 feet to the southwesterly line of property delineated by in place monuments, said property being described in Book 307 of Deeds, page 135; thence South 44 degrees 07 minutes 17 seconds East, along said southwesterly line, a distance of 203.64 feet to the southeast corner of said property described in Book 307 of Deeds, page 135, said corner being in the approximate center line of said Lakamaga Trail North as presently traveled; thence North 43 degrees 54 minutes 16 seconds East 525.89 feet, along said approximate center line of Lakamaga Trail North, delineated by in place monuments in said approximate center line and along the northwesterly right-of-way line, said approximate center line being the southeast line of properties described in Book 307 of Deeds, page 132 through 136, inclusive, to a point which bears North 29 degrees 49 minutes 21 seconds West from the point of beginning; thence South 29 degrees 49 minutes 21 seconds East 3.03 feet to the point of beginning. Subject to a 33.00 foot easement from public road purposes lying southeasterly of and abutting said center line of said Lakamaga Trail North. Subject to a 20 foot wide, non-exclusive, perpetual easement for access to adjoining properties from said Lakamaga Trail North, as described in Book 315 of Deeds, page 6, said easement lying southwesterly of and abutting said property described in Book 307 of Deeds, page 135. Together with any riparian land and rights to said Big Marine Lake that accrue to the above described property. Resolution No.: Page 3 of 4 "Line A" is described as commencing at the southeast corner of said Section 29; thence North 00 degrees 14 minutes 58 seconds East 1436.9 feet along the east line of said Section 29; thence North 89 degrees 45 minutes 02 seconds West, at a right angle to said east line, a distance of 1640.6 feet to the east end of said "Line A"; thence North 89 degrees 10 minutes 02 seconds West, deflecting to the right 00 degrees 35 minutes 00 seconds, a distance of 163 feet, more or less, to said Ordinary High Water line of Big Marine Lake, for the west end of said "Line A". Said "Line A" is the south line of property described in Book 149 of Deeds, page 36. "Line B" is described as commencing at the southeast corner of said Section 29; thence North 00 degrees 14 minutes 58 seconds 1436.9 feet along the east line of said Section 29; thence North 89 degrees 45 minutes 02 seconds West, at a right angle to said east line, a distance of 1640.6 feet to the southwest end of said "Line B"; thence North 25 degrees 37 minutes 58 seconds East, deflecting to the right 115 degrees 23 minutes 00 seconds, a distance of 212.00 feet; thence continuing North 25 degrees 37 minutes 58 seconds East 100.00 feet for the northeast end of said "Line B". Said "Line B" is the southeasterly line of properties described in Book 149 of Deeds, page 36 and Book 182 of Deeds, page 240. All books and pages of deeds recited in this description are on record in the Office of the County Recorder, Washington County, Minnesota. and WHEREAS, the Planning Commission reviewed the request at a duly noticed Public Hearing on October 2, 2007, which was continued to November 6, 2007, and has recommended approval; and WHEREAS, the City Council approved the Preliminary Plat with conditions on November 6, 2007; and NOW, THEREFORE, BE IT HEREBY RESOLVED BY THE CITY COUNCIL OF THE CITY OF SCANDIA, WASHINGTON COUNTY, MINNESOTA, that it should and hereby does approve the request of John and Sandra Swanson for a minor subdivision, final plat for "Old Marine Estates", with the following conditions attached: 1) That plans are signed by the licensed land surveyor. 2) That the Applicant may remove the trees for the driveway, and must complete the deferred maintenance on the remainder of the pine plantation, to ensure its health and function for the future. The required maintenance includes thinning the remaining trees, removing dead or diseased trees, and removing invasive and exotic trees. Maintenance Resolution No Page 4 of 4 must be completed within one year of final plat approval, and the City may inspect the maintenance. Maintenance shall be completed within one year of final plat approval. The cost of inspection by the City is the responsibility of the Applicant. This condition replaces Condition 5 from Preliminary Plat approval, Resolution No. 11-06-07-03. 3) Drainage easements provided to the City shall include the raingardens and access to the raingardens, in the event that the City would need to complete maintenance on behalf of the homeowners. 4) No grading shall occur until a permit, if required, has been issued by the Carnelian Marine Saint Croix Watershed District pursuant to their rules in effect on the date of final plat approval. This condition replaces Conditions 1 and 2 from Preliminary Plat approval, Resolution No. 11-06-07-03. 5) That the Development Agreement shall be fully executed and financial guarantees provided prior to issuance of a building permit. Adopted by the Scandia City Council this 1st day of April, 2008. Dennis D. Seefeldt, Mayor ATTEST: Administrator/ Clerk • TKDA 444 Cedar Street,Suite 1500 Saint Paul,MN 55101-2140 ENGINEERS•ARCHITECTS•PLANNERS (651)292-4400 (651)292-0083 Fax www.tkda.corn MEMORANDUM To: City Council Reference: Old Marine Estates Final Plat Planning Commission City of Scandia, Minnesota Anne Hurlburt, Administrator Copies To: John Swanson, Ned Froberg Proj. No.: 13812.005 From: Berry Farrington, AICP Scandia File Number 2007015 Date: March 27, 2008 Routing: Sherri Buss, RLA SUBJECT: Old Marine Estates Final flat MEETING DATE: April 1, 2008 LOCATION: 11980 Lakamaga Trail Scandia, Minnesota APPLICANT: John and Sandra Swanson ZONING: Agriculture (AG), Shoreland Overlay District 60-DAY PERIOD: May 16, 2008 ITEMS REVIEWED: Final Plat Submittal: plans dated March 11, 12, and 13, 2008, and October 19 and 22, 2007. Letter from Washington County Department of Public Health and Environment, dated December 19, 2007 Memo from Sherri Buss, RLA, dated November 30, 2007 Engineer's memo, dated March 24, 2008 BRIEF DESCRIPTION OF THE REQUEST: The Applicant is requesting final plat approval of the Old Marine Estates minor subdivision, to create three lots at 11980 Lakamaga Trail. The City granted preliminary plat approval, with conditions, on November 6, 2007. EVALUATION OF THE REQUEST: The final plat and associated plans submitted are in substantial agreement with the approved preliminary plat. Plans must be signed by the licensed land surveyor. An Employee Owned Company Promoting Affirmative Action and Equal Opportunity Old Marine Estates Final Plat Page 2 March 27, 2008 Scandia, Minnesota Conditions of Preliminary Plat Approval There were ten conditions of preliminary plat approval. The conditions and their status are described below. 1) That the wetland on Lot 3 not be filled or disturbed and that the Applicant work with the Carnelian Marine St. Croix Watershed District (CMSCWD) on any other potential impacts to the wetlands. The Watershed District Engineer is reviewing the plans, and expects to send written comments this week. He indicated that while there are some outstanding issues to be addressed, he will recommend that the District grant its permit at its April meeting contingent upon the Applicant addressing these items. No wetlands will be filled as part of this project. 2) That the Applicant consult with the Carnelian Marine St. Croix Watershed District regarding wetland rules and setbacks and other issues associated with this proposal and obtain a watershed permit. That the Applicant delineate buffers around the wetlands and Big Marine Lake and address these issues as outlined in the Letter from Dan Fabian dated October 31, 2007. The Applicant has applied for a Watershed District permit. As noted above, there are some items that yet need to be addressed, and will be detailed in the Watershed District Engineer's written comments. 3) That the Applicant obtain approval by the City Engineer of the erosion and sediment control plan with additional detail before final plat approval. That the Applicant design and construct a rain garden or other feature to prevent flooding onto the neighbor's property. The City Engineer has approved the erosion and sediment control plan, as stated in his March 24, 2008 memo. 4) That the Applicant address issues related to drainage computations, design of rain gardens, and additional detail for erosion and sediment control plans, as mentioned in the October 31, 2007, correspondence from the CMSCWD. In phone conversation with the Planner, the Watershed District Engineer cited raingarden construction details as an example of the items yet needed for the District's permit. The Planner recommends that as a condition of final plat approval, that no grading may occur until the Watershed District permit is granted, in order to prevent soil compaction of infiltration areas. Old Marine Estates Final Plat Page 3 March 27, 2008 Scandia, Minnesota 5) That the Woodland Preservation Plan be amended to include additional replacement trees or payment of$100 per tree to the City if adequate space does not exist on the proposed lots for replacement trees. City Staff met with the Applicant at the site last fall to discuss the Woodland Preservation Plan. The attached memo from Sherri Buss, RLA, dated November 30, 2007, summarizes the staff findings and recommendations from that visit. The memo outlines two options that the staff find to be consistent with the Woodland Preservation requirements. The Applicant chose option 2: to remove the trees necessary to build the driveway and complete the deferred maintenance of the pine plantation. The Planner recommends that a condition of final plat approval be that the Applicant may remove the trees for the driveway and must complete the deferred maintenance on the remainder of the pine plantation, to ensure its health and function for the future. The required maintenance includes thinning the remaining trees, removing dead or diseased trees, and removing invasive and exotic trees. Maintenance must be completed within one year of final plat approval, and the City may inspect the maintenance. The cost of inspection by the City is the responsibility of the Applicant. This condition of final plat approval would replace Preliminary Plat Condition 5. 6) That the preliminary plat meet all requirements of the City Engineer, including road design, driveway design, drainage, etc. That the Applicant dedicates land for the turn-around shown boxed off on the Preliminary Plat and included in the right-of-way of Lakamaga Trail. The area should be enlarged(20-30 feet) to allow for snow storage. The final plat includes dedicated right of way surrounding the turn-around. The right of way includes space to the west and east of the bituminous turn-around which can be used for snow storage. The City Engineer's memo reports that road design, drainage, and area for snow storage are adequate. 7) Cash in lieu of land park dedication should be required. Cash in lieu of park land dedication would be $3,000, based on the per lot $1,500 fee in lieu of land. The park fee is not charged for the existing home. 8) That drainage areas are protected through easements provided to the City. Drainage and utility easements are shown on the final plat. Easements cover the shoreland area and wetlands. Easements provided to the City should also include the raingardens and access to the raingardens, in the event that the City would need to complete maintenance on behalf of the homeowners. 9) That areas for septic systems and drainfields be approved by Washington County. Old Marine Estates Final Plat Page 4 March 27, 2008 Scandia, Minnesota Washington County Department of Public Health and Environment indicated in a letter dated December 19, 2007, that soils and area are sufficient for on site septic systems. 10) The accessory structure (shed) on Lot 1 between the house and the lake must either be moved to meet setback requirements or removed. Plans show that the shed will be removed. 11) Access to Lots 2 and 3 shall be from a shared driveway located on Lot 2. The driveway shall be built to meet the requirements of the fire chief to allow emergency vehicle access. A driveway maintenance agreement, in the form of a covenant, shall be recorded prior to issuance of a building permit. This condition must be addressed before the building permit is issued. 12) That all fees are paid, and that any escrow fees needed (i.e. reforestation, water features) be paid to the City prior to final plat approval. The final plat fee and escrow have been paid. Additional financial guarantees will be addressed in the Development Agreement. PLANNING STAFF RECOMMENDATIONS: The Planner recommends approval of the Final Plat for Old Marine Estates with the following conditions: 1. That plans are signed by the licensed land surveyor. 2. That the Applicant may remove the trees for the driveway, and must complete the deferred maintenance on the remainder of the pine plantation, to ensure its health and function for the future. The required maintenance includes thinning the remaining trees, removing dead or diseased trees, and removing invasive and exotic trees. Maintenance must be completed within one year of final plat approval, and the City may inspect the maintenance. Maintenance shall be completed within one year of final plat approval. The cost of inspection by the City is the responsibility of the Applicant. This condition replaces Condition 5 from Preliminary Plat approval, Resolution No. 11-06-07-03. 3. Drainage easements provided to the City shall include the raingardens and access to the raingardens, in the event that the City would need to complete maintenance on behalf of the homeowners. 4. No grading shall occur until the Carnelian Marine Saint Croix Watershed District permit is granted, in order to prevent soil compaction of infiltration areas. 5. That the Development Agreement shall be fully executed and financial guarantees provided prior to issuance of a building pei init. 17$ DEC-19-07 11 :40 FROM-WASHINGTON CTY 651 430 6730 T-004 P 001/002 F-591 W1 I Department of Public asturigton Health and Environment Lowell Johnson Director Sue Hedlund Deputy Director December lc', 2007 John Swanson 11980 Lakani alga Tr Scandia, M 55073 RE: Preliminary Soil Testing, Proposed Old Marine Estates Plat. Soil testing .I.Lbmitted for determination of suitability for sewage treatment systems has been reviewed. Though the specific areas are not identified, Lots 2 and 3 have sufficient area and soil conditions for a standard mound type system. The suggested sewage system locations are two 80' X 150' rectangular areas, 10 feet northwest of the respective proposed southwest lot lines and approximately 250 feet northeast of Big Marine Lake. These areas 3:nould be protected from fill, excavation and grading, since disturbance will void any approval. Sewage syst:.rn permits can be issued for these lots upon submission of application and specific site plan and sewage system design. Lot 1 was pi eviously developed and has soils and area suitable for replacement of the existing sewage system. If you have ;iv questions, please call me at(651)430-6676. Sincerely, —2 Pete Ganzel Senior Environmental Specialist Cc: Anne Hur]burt, City of Scandia Ccvffnment Center • 14949 62nd Street North—P.O. Box 6, Stillwater, Minnesota 55082-D006 Phone: 651-430-6655 • Fax: 651-430-6730 • TTY: 651-430-6246 www.co.washington.mn.us Equal Employment Opportunity Affirmative Action TKD A 444 Cedar Street,Suite 1500 Saint Paul,MN 55101-2140 ENGINEERS•ARCHITEG I •PLANNERS (651)292-4400 (651)292-0083 Fax www.tkda.com MEMORANDUM To: Anne Hurlburt, Administrator Reference: Swanson Minor Subdivision Steve Thorp, Building Inspector Old Marine Estates Preliminary Plat Copies To: Ned Froberg City of Scandia, Minnesota Proj. No.: 13812.005 From: Sherri A. Buss, R.L.A. Routing: Date: November 30, 2007 Woodland Preservation Plan The Applicant completed a Woodland Preservation Plan, as required by the Scandia Zoning Ordinance. The plan shows that 98 trees will be removed, primarily from the common driveway areas. The preliminary plat indicated that some of the trees would be relocated. Chapter Two, Section 9.11(4) of the City's ordinance specifies the replacement requirements for the trees that will be removed. In the event that sufficient land area for replacement is not available on the site, the ordinance allows a tree replacement payment of$100 for each net tree lost. The Applicant contacted a tree service to contract for tree location services. The tree service indicated that most of the trees are of poor quality, and planted so densely that relocation is not feasible. The Applicant is requesting that the City review its requirements for tree replacement based on this finding. Issues The Application raises several issues related to the City's Woodland and Tree Preservation ordinance (Section 9.11). These include: • Does the Ordinance apply in the same way to natural woodlands and tree plantations? • How does the Ordinance apply to trees and woodlands that are in poor condition? • How do replacement requirements apply to tree plantations? And to this plantation, given the quality of the trees in the plantation. Woodlands vs. Plantations The purpose of the City's Woodland and Tree preservation ordinance is the protection of these resources because they provide valuable functions: improving air quality, scenic beauty, protecting against wind and water erosion, shade, natural insulation, energy conservation, wildlife habitat, and protecting the integrity of the natural environment. These functions may be served by both natural woodlands and tree plantations. Tree plantations differ from natural woodlands in several respects: they are voluntarily planted by landowners; they typically consist of one or two tree species planted in close, regular spacing; they usually do not have the subcanopy species and understory species that provide some of the functions and values of natural woodlands. An Employee Owned Company Promoting Affirmative Action and Equal Opportunity Swanson Minor Subdivision Page 2 November 30,2007 Woodland and Tree Preservation Some cities have considered a different status for tree plantations in their ordinances, on the following grounds: • They do not wish to "punish" landowners that voluntarily plant trees for conservation purposes, particularly when plantations are thinned to maintain their health and function, by requiring them to replace trees that are removed from plantations • While the plantations provide some of the functions and values that natural woodlands provide (air quality, scenic beauty, protection against wind, shade, insulation, energy conservation), they do not serve other values as well as natural woodlands, particularly if they are not managed by selective thinning to maintain tree health. Condition of the Swanson Plantation and Trees Mr. Swanson planted the white pine plantation that is within the proposed subdivision voluntarily, under a DNR-sponsored conservation program. The DNR recommended close spacing of trees, based on the potential for losses due to deer predation and other factors. The trees in the plantation were planted in regular rows, with a spacing of 3-5 feet between trees. Mr. Swanson did not thin or manage the plantation in the years following the planting. In this case, nearly all of the trees have survived, and are now 20 or more feet tall. A site visit by the City's Planners, Building Inspector and the Applicant and his Engineer on 11/29/07 verified the conclusions of the applicant's tree service regarding the health of the trees in the plantation. Many of the trees, particularly in the interior of the plantation, are in very poor health due to the close spacing. Some trees have died; others have live branches only at the top due to shading. Relocation will not improve the health or aesthetic quality of the trees--white pines will not grow new side branches. It will also be nearly impossible to bring equipment into the plantation and safely move the trees, due to the close spacing. The site visit identified the following issues to be considered in the application of the City's Ordinance to this subdivision: • The City's ordinance does not require the removal or replacement of diseased, hazardous or dead/dying trees (Section 9.11 [B]). While an exact count was not completed on the day of the site visit, more than half of the trees that the Applicant is proposing to remove could be classified as hazardous, dead or dying. • The close spacing of the trees is now a detriment to the health of the woodland, and impairs some of its functions, including erosion control and habitat value, due to the poor condition of the trees, lack of ground cover and species diversity. • There is limited area for tree replacement on the site due to the area occupied by wetlands, and the need to maintain areas for the future house pads and septic systems. • The primary functions and values that the healthy portions of the plantation provide to the community include scenic beauty as viewed from roadways and adjacent properties, protection from wind, insulation, and habitat value in the areas adjacent to the wetlands. Swanson Minor Subdivision Page 3 November 30, 2007 Woodland and Tree Preservation Options for Enforcement of the Ordinance for this Plantation Planting In this case, the goals of the City's ordinance could be met in the following ways: 1) Require that the Applicant meet the requirements of the Ordinance, and relocate or replace the healthy trees that will be removed for construction of the driveway, or provide payment to the City for those trees. In this case, an accurate count of healthy trees would be required to determine the number of trees to be replaced. Based on the field visit, the planners estimate that this number is likely to be a relatively low proportion of the trees proposed for removal. If the option for replacement is selected, the planners would not recommend that the "Trees planted to replace significant woodland must be arranged in stands to provide a habitat similar to the damaged or destroyed habitat" as required in the Ordinance, but rather that they be spaced appropriately to maintain better health and function. 2) Allow the applicant to remove the trees for the driveway, and require that the Applicant complete the deferred maintenance on the remainder of the plantation, to ensure its health and function for the future. This would include thinning the remaining trees, removing dead or diseased trees, and removing invasive and exotic trees. This option would help to maintain and improve the habitat and erosion control function of the woodland areas along the wetland, and maintain the scenic and protective values of the woodland. If this option is selected, the planners recommend that this maintenance be completed within one year of the removal of the trees and construction of the driveway, and that the area be inspected after the maintenance is completed, to assure that the maintenance was completed appropriately to benefit the health and function of the remaining plantation area. Application of the Tree and Woodland Preservation Ordinance to Plantation Areas Based on this Application, the City may wish to consider how it will enforce the Ordinance on tree plantation areas. In some cases, the plantations could be considered much like orchards. These areas do provide some of the aesthetic and environmental values that natural woodlands provide; however, they may also be planted primarily for economic reasons. The application of the ordinance could be modified to balance protection of the aesthetic and environmental benefits these plantings provide to the community, while ensuring that landowners are not penalized for their efforts. Memorandum r Bonestroo To: Anne Hurlburt, City 2335 Highway 36 W Administrator Project: Old Marine Estates Date: 3/24/2008 St Paul,MN 55113 Tel 651-636-4600 From: I eterson and Emily Client Scandia Fax 651-636-1311 Resseger www bonestroo corn Re: Preliminary Plat comments File No: 000568-08000 Remarks: Updated plans and information from Hult and Associates were received electronically on 3/12/08 We have the following comments: Street, Driveway, Road and Erosion Control 1 Referring to Resolution (Nov 6, 2007)and condition no 3: Erosion and Sediment Control Plan-additional infiltration measures have been added to the plan, including rain gardens and infiltration basins, and sufficient silt fence is shown around the site and along the private driveways This Plan is approved. 2 Referring to Resolution(Nov 6, 2007)and condition no.6: The private driveway design is adequate and drainage along both drives will be handled with shallow ditches that drain to Lakamaga Trail The existing paved turnaround at the end of Lakamaga Trail is within the road right-of-way or the 10-foot wide drainage and utility easement that is on either side of the road. This turnaround is slightly smaller than normal but it has always worked over the years for the few vehicles that use it There is adequate room on both sides of the road for snow storage 3 Cross slopes on the driveways should he shown on the typical sections Either tipping the entire pavement towards one side or show a crown at the centerline Storm Sewer and Drainage 1 Provide 2' of cover over culverts under driveways. Neither the culvert outlet from Basin 6P nor the culvert under the driveway at Lakamanga Trail has adequate cover provided 2 Provide minimum slope on the culvert between Basin 5P and Basin 6P to provide self- cleaning velocities of 3 fps 3 Ensure Basin 15P has a stabilized overflow using either riprap or a turf-reinforced mat. 4 The site meets City requirements for rate control for the 2, 10, and 100-yr storm events and also provides adequate water quality treatment 5 Hydrology to both onsite wetlands has been maintained, and the outlet elevations for the wetlands have also been maintained Page 2 of EMMONS &OLIVIER RESOURCES MEMORANDUM Date: March 27, 2008 To: CMSCWD Board of Managers From: Lisa Tilman, P.E. and Dan Fabian, P.E. Re: Review of Permit Application No. 08-006 using Current and Proposed Rules Old Marine Estates Minor Subdivision, Scandia Big Marine Lake Subwatershed Management Area RECOMMENDATIONS We recommend Managers approve Permit and authorize Administrator to issue permit contingent on Applicant addressing following comments, to satisfaction of District Engineer: Summary of comments to be addressed prior to permit issuance: 1. Revise hydrologic calculations to take into account appropriate assumptions for land disturbances associated with construction and revise stormwater management features as appropriate to standards of the Rules. Alternatively revise construction plans to include restoration of soil permeability lost due to soil compaction from construction activities. 2. Revise hydrologic calculations to use pre-development condition as the standard to meet for rate and volume control. 3. Provide additional detail regarding the construction of the proposed infiltration practices: a. Detail of proposed soil amendment and revegetation practices b. Revised plans showing location and detail of proposed basin outlets c. Revised plans indicating pretreatment provided d. Revised plans indicating scheduling of construction of infiltration areas after completion of roadway. 4. Provide soil borings taken on-site showing soils present and depth to groundwater and revise infiltration facility design as necessary to address results of soil analysis. 5. Revised erosion control plan to include measures to avoid tracking of sediment offsite through vehicle traffic. 6. Verification that the total buffer area is equal to the required buffer area. 7. A declaration of delineating buffer locations (meeting District requirements) and management standards must be recorded against the title of each of the proposed lots. 8. A declaration delineating stormwater management facility (raingardens) locations, maintenance requirements and identification of property owner as responsible party must be recorded against the title of each of the proposed lots. Page 2 3/27/08 Old Marine Estates Review BACKGROUND INFORMATION The Carnelian Marine St. Croix Watershed District (District) initially provided review comments on this project to Scandia in our comment letter dated September 27, 2007, as part of Scandia's consideration of the preliminary plat review. We then provided additional comments dated October 31, 2007, on the revised preliminary plat, Both District comment letters identified the need for a District Permit and were provided to applicant's representative. A complete District Permit Application for this project was received on Thursday, March 13, 2008. The following review of Old Marine Estates in Scandia evaluates the proposed activities with respect to the current and proposed District Rules and Overall Plan requirements, to give Managers an additional comparison of the two rules. The project as proposed would require a permit under the current Rules and Overall Plan Requirements since the project includes; • Subdivision of Land; Driveway Construction/Improvements; • Site Grading greater than 1000 ft^2 or 50 yd^3; • Improvements in the Shoreland Zone; • Drainage System Construction. The project as proposed would trigger the following proposed Rules: • Rule 2.0 Stolinwater Management because the project proposes more than 5,000 square feet of disturbance within 1,000 feet of a public water. • Rule 3.0 Erosion Control because the project proposes disturbance of greater than 5,000 square feet. • Rule 4.0 Lake River Stream and Wetland Buffer Requirements because the project is adjacent to a public water and to wetlands and will be subdivided. • Rule 7.0 Floodplain and Drainage Alterations because the project triggers Rule 2.0 which requires compliance with Rule 7.0. • Rule 8.0 Wetland Management because the project proposes activities that could impact wetlands, an activity regulated under WCA. (Rule would not actually apply until one year after approval by BWSR of WMP and only if Scandia didn't adopt local standards that were at least as restrictive). • Rule 9.0 Fees because the fees are required for all projects reviewed. • Rule 10.0 Sureties because sureties are required for all projects reviewed. REVIEW COMMENTS The Old Marine Estates development is located south of Lakamaga Trail on the east side of Big Marine Lake in Section 29, T32N, R2OW in the City of Scandia, MN (see Figure 1 for location map). The proposed project entails the subdivision of a 14 acre property into three lots and construction of two new houses and associated driveways. The three lots all include shoreline on Big Marine Lake. The property also contains two wetlands. The western wetland is classified in Page 3 3/27/08 Old Marine Estates Review the District's wetland assessment as a Manage 3 wetland and the east wetland is classified as Manage 2. The site does not drain directly to a groundwater-dependent natural resource. The following review comments are organized by District Proposed Rule. Rule 2.0 STORMWATER MANAGEMENT Rate Control According to District's Current Rules and Overall Plan, the peak discharge from a developed area shall be limited to the pre-settlement peak discharge for the 2-year, 10- year and 100-year critical storm events. According to proposed DISTRICT Rule 2.4.1, part (a), a proposed project must not increase peak storm water flow from the site, as compared with the pre-settlement condition, for a 24- hour precipitation event with a return frequency of two, 10, and 100 years for all points where discharges leave a site. The difference between the two standards is the requirement that control be provided for all points of discharge. 1. The existing runoff rates, shown in Table 1, were determined by the applicant using soil classifications from the County Soil Survey and curve numbers assuming a woods and grass combination in fair condition as the existing condition. The site was modeled using HydroCAD. The existing and proposed site drainage boundaries include the offsite drainage contributing to the east wetland. The west wetland discharges offsite to the north under Lakamaga Trail. Wetland 2 does not discharge offsite in any of the modeled events. A volume analysis by FOR indicates that the wetland does not have the capacity to contain a 7.2 inch runoff event, and is therefore not considered landlocked. Table 1. Existing Discharge Summary in CFS 24-Hour Total Storm Discharge Event Rate [year] Off-Site [cfs] 2 2.28 10 3.33 100 13.56 2. The proposed site runoff rates are shown in Table 2. The calculations assume the soils will continue to act as HSG B soils in the proposed condition and assume no disturbance for establishment of a yard, septic system, or land disturbances associated with construction. Revised calculations will be required making appropriate assumptions for land disturbances associated with construction. Alternative is to address soil compaction (refer to item 4 below). Page 4 3/27/08 Old Marine Estates Review Table 2. Proposed Discharge Rate Summary in CFS 24-Hour Total Storm Discharge Event Rate [year] Off-Site [cfs] 2 2.21 10 3.10 100 8.59 3. The proposed and current rules require the control of rates to the pre-development condition using specific curve numbers in the proposed Rule. This project only provides rate control to the existing condition which includes the impervious surface currently present on the site. 4. To address the issue of soil compaction due to construction activities, the proposed Rules require that the applicant either propose a method to restore soil permeability or conduct hydrologic calculations in a manner that considers the additional runoff resulting from compacted soils. The proposed runoff rates shown in Table 2 assume soil permeability for the reclaimed site of HSG B soils. Soil permeability restoration will be required under the reclaimed condition unless HSG C soils are used in the analysis of proposed-conditions runoff from disturbed areas. 5. The proposed total discharge rate offsite is less than the total existing discharge rate offsite. Volume Control - According to District's Current Rules and Overall Plan, the volume of discharge shall be limited to the pre-settlement discharge volumes for the 2-year and 10-year storm events. According to proposed DISTRICT Rule 2.4.1, part (b), a proposed project must not increase stormwater flow volume from the site, as compared with the pre-settlement condition,for a 24- hour precipitation event with a return frequency of two years, or 10 years within a landlocked basin or a subwatershed draining to a landlocked basin. The difference between the two standards is the requirement that control be provided for all points of discharge and the requirement for 10-year volume control only in the case of a landlocked basin under the proposed Rule. 1. The existing runoff volume, shown in Table 3, were determined by the applicant using soil classifications from the County Soil Survey and curve numbers assuming a woods and grass combination in fair condition as the existing condition. The site was modeled using HydroCAD. Page 5 3/27/08 Old Marine Estates Review Table 3. Existing Discharge Summary in AC-FT 24-Hour Total Storm Discharge Event Rate [year] Off-Site [ac-ft] 2 0.267 10 0.677 100 1.331 2. The proposed site runoff rates are shown in Table 4. The calculations assume the soils will continue to act as HSG B soils in the proposed condition and assume no disturbance for establishment of a yard, septic system, or land disturbances associated with construction. Revised calculations will be required making appropriate assumptions for land disturbances associated with construction. Alternative is to address soil compaction (refer to Item 4 below). Table 4. Proposed Discharge Rate Summary in AC-FT 24-Hour Total Storm Discharge Event Rate [year] Off-Site [ac-ft] 2 0.243 10 0.673 100 1.358 3. The proposed rules require the control of volumes to the pre-development condition using specific curve numbers. This project only provides volume control to the existing condition which includes the impervious surface currently present on the site. 4. To address the issue of soil compaction due to construction activities, the proposed Rules require that the applicant either propose a method to restore soil permeability or conduct hydrologic calculations in a manner that considers the additional runoff resulting from compacted soils. The proposed runoff rates shown in Table 2 assume soil permeability for the reclaimed site of HSG B soils in a lawn condition. Soil permeability restoration will be required under the reclaimed condition unless HSG C soils are used in the analysis of proposed-conditions runoff from disturbed areas. 5. The proposed total discharge volume offsite for the 2-year and 10-year events is less than the total existing discharge volume offsite. Pollutant Loading According to Districts Current Rules and Overall Plan, drainage to Class I Protection Lakes must exhibit a 10% reduction in annual phosphorous loading from existing • Page 6 3/27/08 Old Marine Estates Review conditions. Drainage to Class II Improvement Lakes shall exhibit a 25% reduction in annual phosphorous loading from existing conditions. Drainage to Class III Management Lakes shall exhibit a no-net-increase in annual phosphorous loading from existing conditions. According to proposed DISTRICT Rule 2.4.1, part (c), the proposed development must provide water quality BMPs sized to infiltrate and/or retain the runoff volume generated on the site by the 2 year, 24-hour event under the developed condition. The difference between the two standards is a shift from a performance-based standard to a prescriptive standard. The prescriptive standard defines the types of pollutant loading reduction strategies that must be used. 1. The project incorporates three larger infiltration basins and 16 small raingardens along the proposed gravel driveway. 2. If effective, the proposed practices would meet the water quality standard, however additional detail regarding the construction of these practices is necessary to evaluate their potential effectiveness. Required additional information includes: soil borings taken on-site showing soils present and depth to groundwater, detail plans showing proposed soil amendment and revegetation practices, plans showing location and detail of proposed basin outlets, plans indicating pretreatment provided and scheduling of construction after completion of roadway. Lake/Wetland Bounce According to District's Current Rules and Overall Plan, no bounce is allowed on Class I or II wetlands. According to the proposed DISTRICT Rule 2.4.1, part (d), the proposed development must not increase the bounce or duration of inundation of wetlands past the level outlined in Appendix 2.1 of the Rules. The difference between the two standards is that the proposed Rule outlines the allowed increase in bounce based on wetland classification and includes standards for the duration of inundation. 1. The existing CMWD Rules do not have a clear bounce and duration of inundation standard. The western wetland is classified in the District's wetland assessment as a Manage 3 wetland and the east wetland is classified as Manage 2. 2. The existing bounce and duration of inundation for each of the wetlands in the project area is shown in Table 5. The bounce and duration of inundation were determined using the HydroCAD model submitted by the permit applicant. Page 7 3/27/08 Old Marine Estates Review Table 5. Predevelopment Bounce and Duration of Inundation of Wetlands East West wetland wetland 2-year Bounce(ft) 1.47 1.30 10-year Bounce(ft) 2.32 2.24 100-year Bounce(ft) 3.15 2.62 2-year event inundation period 0.5 No outflow (days) 10-year event inundation period 0.5 No outflow (days) 3. The bounce and duration of inundation under proposed conditions for each of the wetlands in the project area is shown in Table 6. Table 6. Proposed Bounce and Duration of Inundation of Wetlands East West wetland wetland 2-year Bounce(ft) 1.31 1.26 10-year Bounce(ft) 2.17 2.04 100-year Bounce(ft) 3.01 2.51 2-year event inundation period 0.5 No outflow (days) 10-year event inundation period 0.5 No outflow (days) 4. The project as proposed meets the proposed Rule standards for bounce and duration of inundation. Rule 3.0—EROSION CONTROL According to District's Current Rules and Overall Plan, the District shall require erosion and sediment control plans to be prepared and submitted for review and approval as part of the permitting process for all construction projects that disturb one acre or more of vegetated cover and for all construction projects, regardless of size, that are within the 1,000-foot shoreland area or within 300 feet of a wetland, or where adjacent streets are served by curb and gutter, and projects that affect critical erosion areas as determined by the Washington Conservation District. According to proposed DISTRICT Rule 3.2, all projects with land disturbing activities involving the movement or stockpiling of 50 cu. yd. of soil or more or involving soil disturbance or Page 8 3/27/08 Old Marine Estates Review removal of vegetation on 5,000 sq. ft. or more shall submit an erosion control plan and are required to obtain an erosion control permit from the District. The difference between the current and proposed Rule is primarily in the areas of applicability; the proposed Rule has been simplified to state that erosion control standards apply to any site disturbing 50 cubic yards or 5,000 square feet or greater. • The erosion control plan for the site includes silt fence and seeding and mulching of disturbed areas. • The erosion control plan should be revised to include measures to avoid tracking of sediment offsite through vehicle traffic. Rule 4.0—LAKE, STREAM, AND WETLAND BUFFER REQUIREMENTS According to District's Current Rules and Overall Plan, the required buffer width is measured from the OHW and varies from 25 to 75 feet depending on the Wetland Management Classification. According to proposed DISTRICT Rule 4.2 buffers are required along streams and lakes that are public waters, groundwater-dependent natural resources, wetlands, and the St. Croix River when a property is subdivided or subject to a variance from the applicable shoreland ordinance. Buffer zone widths are dictated in the Rule based on the type and/or quality of the resource. The difference between the proposed and existing Rules is that the proposed Rule includes buffer requirements for streams, lakes, and the St. Croix River, and increases the maximum buffer width required on high quality wetlands to 100 feet. 1. Under existing Rules, the buffers required on the site's water resources are 25 ft for the east wetland, 50 feet for the west wetland, and 50 feet for Big Marine Lake. 2. The project identifies buffers that may meet the existing standards with averaging of widths. Verification that the total buffer area is equal to the required buffer area is needed. 3. Under proposed Rules, the buffers required on the site's water resources are 50 ft for the east wetland, 75 feet for the west wetland, and 75 feet and extending to the top of any steep slopes for Big Marine Lake. 4. The setback on Big Marine Lake exceeds the standard of 75 feet plus extending to the top of any steep slope, but is not specifically identified as a buffer zone. It does not appear that the buffer on either of the wetlands will meet the proposed buffer standard. Page 9 3/27/08 Old Marine Estates Review Rule 5.0 SHORELINE AND STREAMBANK ALTERATIONS According to Current District Rule Section 7.a, a permit is required for any proposed change to the bed, banks or shores of natural drainageways, lakes, or marshes. Standards and requirements are identified in Overall Plan. According to proposed DISTRICT Rule 5.0, no person shall disturb the natural shoreline or streambank partially or wholly below the ordinary high water mark (OHW) of a waterbody, without first obtaining a District permit. The proposed Rule more clearly indicates the standards for shoreline and streambank stabilization projects. • Rule 5.0 does not apply to the proposed project. Rule 6.0 WATERCOURSE AND BASIN CROSSINGS According to Current District Rule Section 7.a, a permit is required for any proposed change to the bed, banks or shores of natural drainageways, lakes, or marshes. Standards and requirements are identified in Overall Plan. According to proposed DISTRICT Rule 6.0, placement of roads, highways and utilities or agricultural activity in the bed of any waterbody in the District requires a District permit. The proposed Rule more clearly indicates the standards for projects that disturb the bed of a waterbody for agricultural or utility projects. • Rule 6.0 does not apply to the proposed project. Rule 7.0 FLOODPLAIN AND DRAINAGE ALTERATIONS According to Current District Rule Section 5, sulfate water shall not be artificially removed from upper land to and across lower land without adequate provision being made on the lower land for its passage, nor shall the natural flow of surface water be obstructed so as to cause an overflow onto the property of others. Standards and requirements are identified in Overall Plan. According to proposed DISTRICT Rule 7.2, no person shall alter or fill land below the 100-year flood elevation of any waterbody, wetland, or stormwater management basin, or place fill below the 100-year flood elevation of a landlocked basin, without,first obtaining a permit from the District. No person shall alter stormwater flows at a property boundary by changing land contours, diverting or obstructing surface or channel flow, or creating a basin outlet, without first obtaining a permit from the District. Page 10 3/27/08 Old Marine Estates Review The proposed Rule is quite similar to the current Rule but the proposed Rule identifies the standards for low floor elevations and floodplain volume mitigation within the Rule itself instead of only in the Overall Plan. 1. The lowest floor elevations of the proposed houses are 960.3 ft., far exceeding the required two foot difference from the 943.0 ft. flood elevation of Big Marine Lake. Additionally, this low floor elevation is greater than one foot above the overflow elevation of 957.5 for the west wetland and 950.6 for the east wetland. 2. The proposed lowest floor elevations meet the standards of the existing and proposed Rule. Rule 8.0—WETLAND MANAGEMENT According to Current District Rule Section 5, wetlands should be preserved for beneficial use and a permit is required for the draining of wetlands. Standards and requirements are identified in Overall Plan. According to proposed DISTRICT Rule 8.2, the requirements of the wetland management rule apply to all activities regulated by the Wetland Conservation Act unless the municipality has adopted the standards of the DISTRICT Wetland Management Plan within the required timeframe. 1. Rule 8.0 would not specifically apply to the project at this time; however the project will be reviewed against the standards of the rule. 2. The submitted information appears to indicate that no wetland impacts are proposed. Rule 9.0—FEES • The current required review fee of$150.00 has been received. • The Managers have not set a review and inspection fee deposit schedule for the proposed DISTRICT Rules. 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