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4.a Staff Report Stanek Meeting Date: 9/2/08 ) Agenda Item: 1 L ‘` .7 Planning Commission/City Council Agenda Report City of Scandia 14727 209th St. North Scandia, MN 55073 (651) 433-2274 Action Requested: Continue the public hearing on the application of Tom and Lisa Stanek for variances including lot size, setbacks and lot coverage to construct a new home on a vacant lot located at 19107 Layton Avenue. Deadline/ Timeline: 60-day review period expires September 15, 2008 Background: • The public hearing on this application was opened at the August 5, 2008 meeting and continued to the September meeting. The applicant was asked to resubmit a plan reducing the scale of the improvements. • Revised plans were received on August 26. The setback from the lake has been increased and the height of the structure decreased. A rain garden has been added and the impervious cover has been reduced to less than 25%, eliminating the need for a variance for lot coverage. • The planner will present the attached report and recommendations at the meeting on September 2, 2008. Recommendation: The planner has recommended approval of the variances with findings and conditions which have been incorporated into a draft resolution for use by the Planning Commission and City Council. Attachments/ • Draft Resolution 09-02-08-XX Approving Variance Request Materials provided: • TKDA Memorandum dated August 28, 2008 • TKDA Memorandum dated July 30, 2008 • Location Map • Survey dated July 27, 2008 • Letter from John Bower dated August 26, 2008 • Revised Application Materials received August 26, 2008 Contact(s): Tom Stanek, 763 228-0333 Prepared by: Anne Hurlburt, City Administrator (stanek variance continued) Page 1 of 1 08/28/08 CITY OF SCANDIA, MINNESOTA RESOLUTION NO. 09-02-08-XX VARIANCE REQUEST FOR 19107 LAYTON AVENUE WHEREAS, Tom and Lisa Stanek have made application for variances to allow lot size of 10,350 square feet; lot width of 75 feet; setback from the Big Marine Lake Ordinary High Water level (OHW) of 58.5 feet; and right of way setback of 15 feet located at 19107 Layton Avenue; and WHEREAS, the property is legally described as follows: Lot 6, Block 1, Holiday Beach 2nd Plat, Washington County, Minnesota; and and WHEREAS, the Planning Commission reviewed the request at a duly noticed Public Healing on August 5, 2008, and continued the hearing to September 2, 2008, and has recommended approval for the variances to allow lot size of 10,350 square feet; lot width of 75 feet; setback from the Big Marine Lake Ordinary High Water level (OHW) of 58.5 feet; and right of way setback of 15 feet; 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 Tom and Lisa Stanek for variances to allow lot size of 10,350 square feet; lot width of 75 feet; setback from the Big Marine Lake Ordinary High Water level (OHW) of 58.5 feet; and right of way setback of 15 feet; based on the following findings: 1) The subject property has been maintained in separate ownership from contiguous parcels and therefore, as a nonconforming lot, is considered a separate parcel for the purposes of sale or development. 2) A hardship exists because a single family home is an allowed land use in the Agriculture, Shoreland Overlay Districts, but the existing lot is not big enough to allow for a home that conforms to all dimensional standards. Resolution No.: Page 2 of 3 3) The lot is a pre-existing lot on which it would be impossible to build a structure that meets the lot size, lot width, OHW setback, and right of way setback standards. 4) The small size of the lot was not created by the property owner. 5) The construction of the single family home will not alter the essential character of the area. The character of the area is a single family residential neighborhood with homes ranging in size from small cabins to larger year-round homes. The proposed home is similar in scale to other homes located on small riparian lots on Big Marine Lake allowed through the variance process. 6) The proposed home is in harmony with the general purpose and intent of the Ordinance to address environmental and aesthetic concerns, and is consistent with the Comprehensive Plan guidance for protecting natural resources and scenic views. The addition of landscaping and preservation of existing vegetation where feasible protects the environment and scenic view. FURTHER BE IT RESOLVED, that the following conditions of approval shall be met: 1. That the structure is generally in conformance with either site plan, Layout A or Layout B, dated August 26, 2008 and revised building plans received by the City on August 26, 2008. 2. That the Applicant apply for a permit from the Carnelian-Marine-Saint Croix Watershed District. 3. That a landscaping plan is submitted to the City. The landscaping plan must show plantings in the side yards and between the structure and right of way to provide screening from the neighboring properties and street. The landscaping plan must include planting of native species for stormwater management, such as raingardens. The Applicant must verify with the MnDNR.regarding any necessary permit before landscaping below the OHW. The landscaping plan must show that existing vegetation is maintained where feasible, exclusive of any invasive species that may be present. All standards addressing Vegetation Alterations found within the Shoreland Management regulations apply. 4. That the connection and use of the 201 system comply with Scandia Ordinance 108, governing the 201 system. 5. That a permit is granted from Washington County Department of Health and Environment for wastewater treatment. 6. That all fees are paid. Resolution Page 3 of 3 Adopted by the Scandia City Council this second day of September, 2008. Dennis D. Seefeldt, Mayor ATTEST: Administrator/Clerk T 444 Cedar Street,Suite 1500 Saint Paul,MN 55101-2140 ENGINEERS•ARCHITECTS•PLANNERS (651)292-4400 (651)292-0083 Fax www.tKda.com MEMORANDUM To: City Council Reference: Stanek Variance Re uests Planning Commission City of Scandia, Minnesota Anne Hurlburt, Administrator Copies To: Tom and Lisa Stanek Proj. No.: 14059.006 From: Berry Farrington, AICP Scandia File Number 2008012 Date: August 28, 2008 Routing: Sherri Buss, RLA SUBJECT: Stanek Variance Requests MEETING DATE: September 2, 2008 LOCATION: 19107 Layton Avenue Scandia, Minnesota APPLICANT: Tom and Lisa Stanek ZONING: Agriculture (AG), Shoreland District 60-DAY PERIOD: September 15, 2008 ITEMS REVIEWED: Revised site plan dated August 26, 2008, Revised building elevation (street side) and floor plan BRIEF DESCRIPTION OF THE REQUEST: The Applicant is requesting variances for lot size, lot width, setback from the Ordinary High Water level (OHW) of Big Marine Lake, and right of way setback. The public hearing was continued from the August 5, 2008 meeting, where the Planning Commission and City Council suggested that the Applicant revise the plans to address comments made at the hearing. Based on changes made, a variance to the lot coverage maximum is not needed. This memo notes the changes made by the Applicant. The full staff analysis may be found in the memo dated July 30, 2008. The recommended findings and conditions have been updated to reflect the changes made to the site plan and building plans. An Employee Owned Company Promoting Affirmative Action and Equal Opportunity Stanek Variance Request - Revised Plans Page 2 August 28, 2008 Scandia, Minnesota SUMMARY OF REVISED PLANS: The plans have been revised to reduce the height of the structure, reduce the lot coverage, and lengthen the setbacks from the street and OHW, The Applicant is requesting the option to later detei inine the specific layout of the house on the property, as shown on the two plans, Layout A and Layout B. The two layouts are essentially the same home, mirrored. Layout A has the garage on the north, and Layout B has the garage on the south. The Applicant's architect has indicated that the request for the two options, with one to be selected before receiving a building permit, is so that he can place the house on the site to best avoid trees, limit grading, and to allow him to get a more detailed survey as they move forward in the building pei mit process. Zoning standards do not determine a favorable layout in this case. There would not be any additional safety concerns regarding either driveway location over the other, nor any differences with regard to views from the street or lake. However, the two layouts show different setbacks from the OHW: Layout A with a setback of 58.8 feet and Layout B with a setback of 58.5 feet. Given the very small difference in setback, the Planner recommends that the City consider the variance to allow an OHW setback of 58.5 feet, the option closer to the lake, and allow that the Applicant may select either Layout A or Layout B during the building permit process. The following table summarizes the zoning requirements, previously proposed development plans, and revised plans. Standard Required Previously Proposed Revised Plans OHW 100 feet 33 feet as measured from deck 58.5 feet - variance requested setback 47 feet without deck Right of Way 40 feet 14 feet 15 feet - variance requested setback Side Yard 10 feet 10 feet 10 feet setback Lot Maximum 3,509 sf(33.9%) 2,566 sf(21.4%) Coverage of 25% Including pervious paver areas Building 35 feet 32 feet 28.5 feet Height Variances are still requested for lot width of 75 feet and lot size of 10,350 square feet. The Applicant's architect indicates that he is working with the Minnesota Department of Natural Resources and Carnelian-Marine-Saint Croix Watershed District to develop landscaping plans with the intent of protecting water quality. A raingarden is proposed in the natural depression located below the OHW. The DNR has jurisdiction in this area and the Applicant is in the process of communicating with the DNR about this proposal. The Planner recommends that a landscaping plan be submitted to the City. Stanek Variance Request - Revised Plans Page 3 August 28, 2008 Scandia, Minnesota ACTION REQUESTED: The Planning Commission can recommend: 1. Approval 2. Approval with conditions 3. Denial with findings 4. Table the request PLANNING STAFF RECOMMENDATIONS: The Planner recommends conditional approval of the variances to allow lot size of 10,350 square feet; lot width of 75 feet; setback from the Big Marine Lake Ordinary High Water level (OHW) of 58.5 feet; and right of way setback of 15 feet; for 19107 Layton Avenue. The Planner's recommendation is based on the following findings: 1) The subject property has been maintained in separate ownership from contiguous parcels and therefore, as a nonconforming lot, is considered a separate parcel for the purposes of sale or development. 2) A hardship exists because a single family home is an allowed land use in the Agriculture, Shoreland Overlay Districts, but the existing lot is not big enough to allow for a home that conforms to all dimensional standards. 3) The lot is a pre-existing lot on which it would be impossible to build a structure that meets the lot size, lot width, OHW setback, and right of way setback standards. 4) The small size of the lot was not created by the property owner. 5) The construction of the single family home will not alter the essential character of the area. The character of the area is a single family residential neighborhood with homes ranging in size from small cabins to larger year-round homes. The proposed home is similar in scale to other homes located on small riparian lots on Big Marine Lake allowed through the variance process. 6) The proposed home is in harmony with the general purpose and intent of the Ordinance to address environmental and aesthetic concerns, and is consistent with the Comprehensive Plan guidance for protecting natural resources and scenic views. The addition of landscaping and preservation of existing vegetation where feasible protects the environment and scenic view. The Planner recommends conditional approval of the variances to allow lot size of 10,350 square feet; lot width of 75 feet; setback from the Big Marine Lake Ordinary High Water level (OHW) of 58.5 feet; and right of way setback of 15 feet; for 19107 Layton Avenue, with the following conditions: 1. That the structure is generally in conformance with either site plan, Layout A or Layout 13, dated August 26, 2008 and revised building plans received by the City on August 26, 2008. 2. That the Applicant apply for a permit from the Carnelian-Marine-Saint Croix Watershed District. Stanek Variance Request - Revised Plans Page 4 August 28, 2008 Scandia, Minnesota 3. That a landscaping plan is submitted to the City. The landscaping plan must show plantings in the side yards and between the structure and right of way to provide screening from the neighboring properties and street. The landscaping plan must include planting of native species for stormwater management, such as raingardens. The Applicant must verify with the MnDNR regarding any necessary permit before landscaping below the OHW. The landscaping plan must show that existing vegetation is maintained where feasible, exclusive of any invasive species that may be present. All standards addressing Vegetation Alterations found within the Shoreland Management regulations apply. 4. That the connection and use of the 201 system comply with Scandia Ordinance 108, governing the 201 system. 5. That a permit is granted from Washington County Department of Health and Environment for wastewater treatment. 6. That all fees are paid. TKDA 444 Cedar Street,Suite 1500 Saint Paul,MN 55101-2140 ENGINEERS•ARCHITECTS•PLANNERS (651)292-4400 (651)292-0083 Fax www.tkda.com MEMORANDUM To: City Council Reference: Stanek Variance Requests Planning Commission City of Scandia, Minnesota Anne Hurlburt, Administrator Copies To: Tom and Lisa Stanek Proj. No.: 14059.006 From: Berry Farrington, AICP Scandia File Number 2008012 Date: July 30, 2008 Routing: Sherri Buss, RLA SUBJECT: Stanek Variance Requests MEETING DATE: August 5, 2008 LOCATION: 19107 Layton Avenue Scandia, Minnesota APPLICANT: Tom and Lisa Stanek ZONING: Agriculture (AG), Shoreland District 60-DAY PERIOD: September 15, 2008 ITEMS REVIEWED: Application materials received June 10, 2008 Amended site plan received July 17, 2008 and related pervious paver information BRIEF DESCRIPTION OF THE REQUEST: The Applicant is requesting variances to allow construction of a new home located at 19107 Layton Avenue in the Bliss Addition on Big Marine Lake. The property is in the Agriculture District, and Shoreland Management District. The parcel was created before the requirements of today's Development Code were established, and therefore the existing lot does not meet all of the City's current standards. The variances needed in order to develop the property as proposed are for lot size, lot width, setback from the Ordinary High Water level (OHW) of Big Marine Lake, and right of way setback. In order to develop the property as proposed, the Planner finds that a variance to exceed lot coverage of 25% is also needed. BACKGROUND There are no existing structures on the subject property, The Applicant proposes to build a new home on the existing parcel of land. Certificate of Title for this property and the adjacent properties have been provided, which indicate that the properties have not been in common ownership. The Scandia Development Code, An Employee Owned Company Promoting Affirmative Action and Equal Opportunity Stanek Variance Request Page 2 July 30, 2008 Scandia, Minnesota Chapter 1, Section 12.4 (4) addresses contiguous, nonconforming lots under common ownership. The property has been maintained in separate ownership from contiguous parcels and therefore, as a nonconforming lot, is considered a separate parcel for the purposes of sale or development. Chapter 1, Section 6.4 of the Scandia Development Code describes the criteria for granting variances. It states that variances are only to be peiiiiitted when they are in harmony with the general purpose and intent of the Development Code, in cases where there are particular hardships, and when consistent with the Comprehensive Plan. Hardship means that the property cannot be put to a reasonable use if used under the conditions in the Ordinance; that the plight of the landowner is due to circumstances unique to the property, not created by the landowner; and that the variance would not alter the essential character of the area. EVALUATION OF THE REQUEST: Lot Size and Width The Scandia Development Code, Chapter 5, Section 7 addresses lot size and width requirements in the Shoreland District. The minimum lot size is 2.5 acres and the minimum lot width is 150 feet. The subject property is 10,350 square feet,just less than a quarter acre in size, and is approximately 75 feet wide. The existing lot does not meet the lot size and width standards. Variances are requested to allow a lot size of 10,350 square feet and a lot width of 75 feet. Setbacks The Shoreland Management Regulations, Section 8, addresses setback requirements. Big Marine Lake is classified as a General Development Lake. The OHW is 942.2 and the setback required from the OHW is 100 feet for a General Development Lake. The proposed home is 47 feet from the OHW, and there is a proposed deck that is 33 feet from the OHW. The Applicant requests a variance to allow an OHW setback of 33 feet, as measured from the OHW to the proposed deck. Analysis of the site plan indicates that there may be space to the north of the home where a deck could be located, confoi wing to a setback of 47 feet from the OHW. The Shoreland District requires a public right of way setback of 40 feet. The Applicant requests a variance to allow a 14 foot setback from the Layton Avenue. For existing parcels one acre or less in size, the side yard setback for a lot on a Recreation Development Lake is 10 feet. The proposed home conforms to the 10 foot side yard standard. The following table summarizes the setback requirements and proposed setbacks. Setback type Required Proposed OHW 100 feet 33 feet (Planner recommends 47 feet) Right of Way 40 feet 14 feet Side Yard 10 feet 10 feet Stanek Variance Request Page 3 July 30, 2008 Scandia, Minnesota Lot Coverage The Shoreland Management Regulations, Section 8.4, addresses lot coverage. It states, "A maximum of 25% of the lot may be covered with impervious surface. This includes all structure, decks, patios, walks, and surfaced or unsurfaced driveways." The subject property is 10,350 square feet. Twenty-five percent of the total area is 2,587.5 square feet. The Applicant proposes the following improvements that would result in impervious lot coverage: House 2,165 square feet Deck 336 square feet Entrance pad 84 square feet TOTAL 2,585 square feet (25°A) of site) The Applicant proposes to use pervious paver systems to build the driveway, path, north patio, and east patio. The square footage of the pervious paver areas are as follows: Driveway 384 square feet Path 180 square feet North patio 360 square feet East patio 336 square feet TOTAL 1,260 square feet (12% of site) The Applicant has provided general infoiniation about the proposed pavers and results from a soil boring taken in the proposed driveway area. The attached memo is a review of the pervious paver information. Soils are sandy and will provide for fairly rapid infiltration. The proposed paver materials are permeable. The ability of the pervious paver areas to infiltrate storm water will depend on how they are designed, installed, and maintained. The pervious paver review memo makes general recommendations for design and installation. The Planner recommends that the pervious paver area should not be fully excluded from the calculation of lot coverage, and that a variance to exceed 25% lot coverage be considered. Site-specific design detail and installation instructions, and a maintenance agreement, would be needed to identify a suitable credit for the pervious pavers. The Shoreland Management Regulation's definition of lot coverage specifically includes patios, walks, and driveways. In addition, maximum lot coverage standards include benefits in addition to storm water management, such as the aesthetic benefits of vegetation. The City of Scandia has not previously fully excluded pervious paver areas from the calculation of lot coverage. The Planner recommends the variance for lot coverage be approved, with the house, deck,and entrance pad not to exceed 25% of the lot, and with pervious pavers not to exceed 12% of the lot. Wastewater Treatment The proposed home will connect to the Bliss Addition common wastewater treatment facility (201 system). The Applicant provided a letter from Washington County Department of Public Health and Environment stating that the 201 system has capacity to serve the proposed home. Stanek Variance Request Page 4 July 30, 2008 Scandia, Minnesota Building Height The Shoreland Management Regulations, Section 8.3 establishes a maximum building height of 35 feet. The proposed home is approximately 32 feet tall, as measured from the mean height at grade to the mean height between the eaves and ridge. The proposed structure conforms to the height standard. Minnesota Department of Natural Resources (MnDNR) Because the proposed home is in the Shoreland District, the application materials were submitted to the MnDNR for review and comment. Written comments have not been received at this time. Carnelian-Marine-Saint Croix Watershed District Because the proposed home is in the Shoreland District and requires a variance from the City, a peiiiiit from the Watershed District is needed. The Planner recommends that as a condition of approval, the Applicant apply for a peimit from the Carnelian-Marine-Saint Croix Watershed District. Consistency with Comprehensive Plan, intent of the Ordinance, and character of the area Variances may be granted when in harmony with the general purpose and intent of the Development Code and when consistent with the Comprehensive Plan. Variances must not alter the essential character of the area. The character of the Bliss Addition is residential lakeshore development on small lots, with structures ranging from small cabins to large homes. The essential character of the area is changing, as smaller homes and cabins are expanded or replaced with larger homes. Larger homes have been allowed in the area so long as they meet the general intent of the Development Code by addressing environmental and aesthetic concerns such as landscaping, screening, stormwater management, and alternative wastewater treatment systems. The adopted Comprehensive Plan calls for Recreational Development lakeshore densities consistent with the 2.5 acre lot size standard, but it does not address the unique situation of the Bliss Addition where lots were subdivided before adoption of a Comprehensive Plan. The Plan emphasizes the value of natural resources and scenic views in Scandia. The draft 2030 Comprehensive Plan, not adopted by the City, addresses lakeshore traditional areas that includes the Bliss Addition. The goal for such areas is, "To maintain the established pattern of small-lot residential development in lakeshore areas while improving stormwater management and land stewardship practices." ACTION REQUESTED: The Planning Commission can recommend: 1. Approval 2. Approval with conditions 3. Denial with findings 4. Table the request Stanek Variance Request Page 5 July 30, 2008 Scandia, Minnesota PLANNING STAFF RECOMMENDATIONS: The Planner recommends conditional approval of the variances for lot size of 10,350 square feet; lot width of 75 feet; setback from the Ordinary High Water level (OHW) of 47 feet; right of way setback of 14 feet; and lot coverage greater than 25%, with the house, deck, and entrance pad not to exceed 25% of the lot and with pervious pavers not to exceed an additional 12% of the lot; for 19107 Layton Avenue. The Planner recommends that the proposed deck he removed or relocated to the north. The requested OHW setback shown is 33 feet, but removal or relocation of the deck would result in an OHW setback of 47 feet. The Planner's recommendation is based on the following findings: 1) The subject property has been maintained in separate ownership from contiguous parcels and therefore, as a nonconforming lot, is considered a separate parcel for the purposes of sale or development. 2) A hardship exists because a single family home is an allowed land use in the Agriculture, Shoreland Overlay Districts, but the existing lot is not big enough to allow for a home that conforms to all dimensional standards. 3) The lot is a pre-existing lot on which it would be impossible to build a structure that meets the lot size, lot width, OHW setback, and right of way setback standards. 4) The proposed deck further encroaches on the OHW setback than the proposed house. An alternative location for the deck exists on the north side of the house, where it would reside outside of the 47 foot OHW setback established by the house. 5) As proposed, the house, deck, and entrance pad cover 25% of the lot, and pervious pavers cover an additional 12% of the lot. In combination, these areas cover greater than 25% of the lot. The lot coverage greater than 25% is a function of the small size of the lot. The lot coverage greater than 25% allows for reasonable use of the property. Pervious paver areas are not fully excluded from the calculation of lot coverage because site-specific design detail and installation instructions, and a maintenance agreement, would be needed to ensure ongoing permeability, and because pervious pavers do not contribute other benefits of vegetated, uncovered surfaces. The use of pervious pavers is an improvement from traditional impervious surface for the purpose of protecting water quality. 6) The small size of the lot was not created by the property owner. 7) The proposed home is consistent with the emerging character of the Bliss Addition. It is similar to other newer homes in scale and placement on the lot. 8) The proposed home is in harmony with the general purpose and intent of the Ordinance to address environmental and aesthetic concerns, and is consistent with the Comprehensive Plan guidance for protecting natural resources and scenic views. The use of pervious pavers is a method to protect the natural environment. The addition of landscaping and preservation of existing vegetation where feasible protects the environment and scenic view, The Planner recommends conditional approval of the variances for lot size of 10,350 square feet; lot width of 75 feet; setback from the Ordinary High Water level (OHW) of 47 feet; right of way setback of 14 feet; and lot coverage greater than 25%, with the house,deck, and entrance pad not to exceed 25% of the lot and with • Stanek Variance Request Page 6 July 30, 2008 Scandia, Minnesota pervious pavers not to exceed an additional 12% of the lot; for 19107 Layton Avenue. The Planner recommends the following conditions: 1, That the structure is generally in conformance with the site plan dated June 10, 2008 and amended to show driveway and patio areas, and with the building plans received by the City of Scandia June 10, 2008, except that the proposed deck is removed, or moved to conform with a setback of 47 feet from the OHW and side yard setback of 10 feet. 2. That the Applicant apply for a permit from the Carnelian-Marine-Saint Croix Watershed District. 3. That the pervious pavers are designed, installed, and maintained per the manufacturer's recommendations. 4. That landscaping is planted in the side yards and between the structure and right of way to provide screening from the neighboring properties and street. 5. That existing vegetation is maintained where feasible, exclusive of any invasive species that may be present. All standards addressing Vegetation Alterations found within the Shoreland Management regulations apply. 6. That the connection and use of the 201 system comply with Scandia Ordinance 108, governing the 201 system. 7. That all fees are paid. • 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: Berry Farrington Reference: Pervious Paver Review Copies To: Sherri Buss 19107 Layton Avenue Proj. No.: 14059.006 From: Connie Taillon, PE Routing: Date: July 24, 2008 The following review for 19107 Layton Avenue is based on these submittals: 1. Certificate of Survey (with paver areas highlighted) prepared by Landmark Surveying, Inc., dated June 10, 2008, 2. Soil Boring Test Report prepared by Tradewell Soil Testing, dated July 15, 2008 3. Aquapave, Uni Eco-Stone, and Netpave 50 Brochures, 4. Report of Infiltration Testing prepared by American Engineering Testing, Inc., dated August 3, 2007. Comments: 1. The soil boring results indicate an 8 inch layer of loamy fine sand topsoil underlain by a 20 inch layer of medium fine sand (type"A" soil classification) followed by a 49 inch layer of fine sand with fine silty loam bands. A perk test was conducted in the medium sand layer. This soil layer was found to be very well drained and suitable for infiltration. When installing the permeable pavement, it is highly recommended that the soil subgrade be located in this medium fine sand layer. 2. The three paver material options shown in the submitted product brochures meet the intent of the permeable pavement criteria, The design of the product(s) selected for the site should meet the manufacturer's requirements for structural stability, base and sub base materials, and installation procedures. It is recommended that the permeable paver areas be designed to meet the following stormwater objectives: • The sub base should be designed to store and infiltrate an equivalent volume of water consistent with a lawn area in type A soils for storm events up to and including the 100-year event. • Pavement void area and slope should allow the required volume of water to permeate into the sub base. • 'Fhe stored water volume should draw down within 48 to 72 hours into the soil subgrade (no under drains). 3. Detailed installation instructions should be supplied to the contractor, including how compaction and siltation of the subgrade soils will be minimized during both the house and driveway construction. If the soil subgrade will require compaction for structural stability as per the manufacturer's recommendations, an on-site infiltration test of the compacted soil should be performed, 4. The manufacturer's maintenance recommendations should be followed to maintain the infiltration capacity of the pervious pavement. An Employee Owned Company Promoting Affirmative Action and Equal Opportunity ftl C Q) (.0 a) > c - L_ ..‹ 0 al (3 10 co 4-, C (Th. 111111111111 '.0 CD Cr) -1 0 4..) --,. os C w •• •...,,• c CO a) t-••••C Z (13 •-,'"u ....r.*0 C) (DC E 7/3 me S P-, # , 4 . •,,, .... (NI - •. 4,* N, i., r!„ -. $1, L.: .. ..... 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G K d ` - t h it ,t V Q o C c r L n 4 t, c r §..c ft A ,ate. t� =� As*'— .r r-t t ly4c r "8 ?e r? .�^ '� 1 ltl t r ) I .� � ro �i ` it `Ittls : .` "rr - j 1111 ; s 'N 141111 il 1 ii 1 At14, I� .le I: 4 il s i � U z. ;0 o-, 7h 1!1 ' ' August 26, 2008 - Scandia Planning Board Anne Hudburt, Administrator '-- ----Re: Stanek StanekVahance Requests When | read the August 131'' Country Messenger article about the Big Marine variance requests it sounded similar to one adjacent tomy home nn Big Carnelian Lake. These small lots were platted before there were shore|and regulations. Planners and local governments officials back then were not aware of the effects building homes on these small lots would have on the water resources. HnpnfuUytodav's land use officials are wiser. Local officials must make decisions that weigh the property rights of the owners of the small lots against those of the adjoining property owners and the public in general. Washington County and Scandia use the 25% impervious surface standard as an upper limit when ruling on these matters. Documented studies show that some damage begins to occur to the water resources when impervious surfaces exceed 10% and serious damage occurs when it exceedsZS96. 8y settling on 2S96 you are accepting some damage to the water resource. You should be asking for a smaller structure and something to mitigate the storm water impacts to the lake if you grant these variances. The very fact that the applicant is asking for four variances should trigger the alarm bells. The OHVV of9422 is often used as a benchmark to determine the |ovv floor elevation of the proposed structure. | would recommend more than the 2 feet above that level for the low floor. The 500'year flood elevation is 942.9 may be a better benchmark to use than the {)HVV. / personally maintain the outlet to the lake and the channel maintenance downstream but there isno guarantee that will happen forever, Storm events are becoming more severe with the change in climate and experts tell us to expect more extremes in the future. You should also take into account the adjoining property owners. This granting should not affect their property values. | would make sure there will not be any storm water impacts onto the adjoining properties. You should also look at the height of the structure. You should not allow the structure to block the sunlight during the winter/fall months of the year because it will increase their heating costs. Once the dust settles these people have to live together as neighbors in your community. How do you treat the storm water on such a small lot? /t looks |)he most of the area between the proposed structure and the lake is below the OHVV. This area is marginal at best for infiltration. Vegetation will be necessary to filter the storm water before it enters the lake. it needs to be something other than a manicured lawn. You may want to require some sort of natural buffer. The water quality of the lake has a large impact on property values. This may seem like a small impact but they all add up. | have been an advocate for many smaller projects on Big Carnelian Lake and they seem to he paying off. The water quality ofBig Marine Lake took an unexpected drop the last few years and is a concern for many. Not only is Big Marine a local asset but a regional one. It is sh|| one of the best lakes in the twin cities area, Please do what you can to keep it that way and perhaps create some harmony in the area at the same time. John Bower Concerned Area Lake Resident • /,--.1 i * ,-. . k7.Z z -t' -- fr•'.,,. 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