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HomeMy WebLinkAbout1993- MCWD permit #93-72 MINNEHAHA CREEK ,,OHAHq Cq WATERSHED BOUNDARY N nx `= � WATERSHED DISTRICT 414 iro t 14600 Minnetonka Boulevard 44,4411 dor f 67ED 0\ �Q Minnetonka, Minnesota 55345-1597 ♦ 4. office:(612)939-8320 fax:(612)939-8244 LAKE MINNETONKA DISTRICT COORDINATOR:Ellen B.Klanderman MINNESOTA RIVER . a -_- - • BOARD OF MANAGERS:James R.Spensley,Pres.•John E.Thomas•Thomas W.LaBounty — Robert D.Erickson•C.Woodrow Love•Clarkson Lindley•Thomas Maple,Jr. 993 �y J3 PERM! _ Pursuant to Minnesota Statutes Chapter 103D, and on the basis of sta�teii4nts and information contained in the permit application, correspondence, plans, maps, and all other supporting data submitted by the applicant, all of which are made a part hereof by reference, PERMISSION IS HEREBY GRANTED to the applicant named below for use and development of land in the Minnehaha Creek Watershed District. It is recommended that the following condition be placed on the permit: 1. A licensed shoreline contractor shall be used if any shoreline work is performed below elevation 931.5. Issued to: Susan Sumey Permit No. 93-72 Location: City of Orono, T117, R23, Sec. 8 Purpose: Stormwater management plan involving placement of geogrid to prevent erosion of bank adjacent to lakeshore. Date of Issuance: Date of Expiration: 5/27/93 5/27/94 By Order of the Board of Managers Ellen B. Klanderman District Coordinator This permit is not transferable, and is valid to the date of expiration. No activity is authorized beyond the expiration date. If the permittee requires more time to complete the project, and application for renewal of the permit is required. The applicant is responsible for compliance with all District rules and for the actions of their representatives, contractors, and employees. (Statement concerning fees for inspections, violations, etc. on back of permit. ) Inspection/Analysis/Monitoring Fees A site inspection and monitoring by District staff will be performed where the activity involves: • a commercial/ industrial/multi-family residential development. • a single family residential development greater than 5 acres or of any size if within the Minnehaha Creek subwatershed. • any alteration of a floodplain or wetland. • dredging within the beds, banks or shores of any protected water or wetland. • a violation. • any project which in the judgement of District staff should be inspected due to project location, scope, or construction techniques. In these cases, the applicant shall pay to the District a fee equal to the actual costs of field inspection of the work, including investigation of the area affected by the work, analysis of the work, and any subsequent monitoring of the work, which in the case of a violation shall be at least $35. Standard Fee Schedule (hourly rate) * District Engineer: $115 District Counsel: 125 District Coordinator: 40 *As of March 1, 1993 , subject to change I ; JUN--22-'93 TUE 07:27 ID:MIRAF I MPLS MN TEL ND:612-473-7203 1t109 P01 1330 CI.4 r- . �. RIRAFI Division of NICOLONCorporation AUG 3 0 '1993 June 21, 1993 Mr. Stephen Spartz Drm 367+ Highway 7 NE_ Excelsior, MN 55331LECML�-- ro: Susan Surrey Residence Shoreline Restoration Dear Mr. Spartz, As we discussed earlier, the proposed connection of MIRAGRID to the steel pipe anchorage is better achieved by wrapping the MLRAGRID under and around the pipe 180 degrees and then Pack toward the face of the slope a minimum of 3-4 feet. A minimum 2- 3 inch compacted soil layer should be placed between the two grid surfaces. Secondary reinforcement (intermediate layers of MIRAGRID) should be placed between the primary layers of reinforcement to prevent slouching of the slope surface and to act as compaction aide at the face of the slope. The secondary MIRAGRID 'layers should extend a minimum of 3-4 feet into the embankment from the slope face Additionally, Mirafi recommends that a permanent erosion control mat similar to Miramat 1000 be used to protect the slope face, since t 111 clop angio will be tfiffl(•uit to Vegetate properly. The example design has not been checked by Mirafi for external . internal or global stability. Mirafi recommends that An engineer eeegi terod in the state of Minnesota and familiar with reinforced soil design review this design prior to installation_ Should you have any questions, please feel free to contact me. Sin erely, ohn F. Mathews Regional Product Manager JM/5m • IvliXafi, 15500 Way ara Boulevard, Suite 914, Minneapolis, MN 55391 • (612) 473-6650 • Fax (612) 473-7203 How Mirafi Miragrid 5T is wraped .„. ., 2-3' overhang .,--- --„, 0.1 54 .„., . a - _, „.... ,.... , • --, -, ,„ 2-3" of fill between _,... - '-.- --- ---,_. „„ ,..,_--- „.., , /...,,, --,_ ---_, -----_, -:k.: - - miragrid wrap --.._ ... .„_ '--- ---- -----\-- '----:----- ----)4---- 4' Anchors ---- ---,, --, ---,..--, --- :---, -------:\-„ '- :-.~-, --- -' I 5" 31 uner-lap --,,. „:?) , pipe wraps around pipe -. ....----•N „..------- T Coupling placed on the ends of pipe to : 1 0' prevent the pipes from disconnecting from the tr Anchors July 19, 1993 From: Landview Landscaping 3670 Hwy 7 Excelsior, MN 55331 Stephen Spartz To: Advance Surveying&Engineering Co. 5300 S. Hwy. No. 101 Minnetonka, MN 55345 Jim Parker Attention Jim Parker, Landview Landscaping has used the American Excelsior Erosion Control blanket in the past and is pleased with the results. We have compared it to just installing sod and have made the following comments about the comparison. On steeper slopes where it is very difficult to lay sod we prefer to use the American excelsior Turf Reinforcement For the following reasons. 1. Sod comes in smaller units 1.5'X 6'whereas American excelsior comes in Larger units 8'X 100'. A. Usually if one unit of sod comes loose it leaves the others less secure because of undermining. B. Because of the larger units it leaves less room for error. C. It provides a great environment for all types of low vegetations spreading turf Reinforcements such as crow vetch. Wearers the sod would mainly stay as sod and slow down the growth rate of the better Crown Vetch(low profile good&root base). D. American Excelsior cost less and is easier to install. We just completed a project last week with the American excelsior Turf Reinforcement and were amazed at how much faster the seed grew where we used the Fabric then where we did not. I highly recommend the American Excelsior Fabric for the Susan Sumey Project. Sincerely, 14#1" 311417 Stephen Spartz July 27, 1993 From: Landview Landscaping 3670 Hwy 7 Excelsior, MN 55331 Stephen Spartz To Advance Surveying&Engineering Co. 5300 S. Hwy. No. 101 Minnetonka, MN 55345 Jim Parker Attention Jim Parker, I, Stephen Spartz, am confident that the American Excelsior Control Blanket will prevent erosion into the lake. I am less confident that pegged sod will hold up as well as the American Excelsior Control Blanket in the case of a downpour. The American Excelsior Control Blanket was created for stabilizing steeper slopes were sod is less likely to do its job. According to my experience the American Excelsior Erosion Control Blanket has done better than pegged sod both in cost and erosion control. I have totally gone away from sod in cases such as the Susan Sumey project. Pegged sod can simply not do as good of job in erosion control as the American Excelsior Erosion Control Blanket. I can Guarantee the American Excelsior Erosion Control Blanket will outperform Pegged sod in the case of a downpour. If you have any more 7s concerning the American Excelsior Erosion Control Blanket please direct your 7s to American Excelsior Co. 3101 Talmadge Ave. SE Minneapolis, MN Attention Paul Worthman 331-1831 Sincerely, 141." 4414j ;5— Stephen Spartz July 28, 1993 From: Landview Landscaping 3670 Hwy 7 Excelsior, MN 55331 Stephen Spartz To Advance Surveying&Engineering Co. 5300 S. Hwy. No. 101 Minnetonka, MN 55345 Jim Parker Attention Jim Parker, Described below is Matter of Maintenance According to the United States Department of Agriculture Soil Conservation Service St. Paul Minnesota. Slope Protection for Dams and Lakeshores Minnesota Technical Release 2 April 1988. From their Advice I have put together a contract that states it is the responsibility of the Homeowner(Susan Sumey)to get the necessary groundcover to grow on the 1:1 slope. The home owner has the responsibility to decide with the advice of Landview Landscaping and others involved which ground cover is best suited for the Susan Surrey project Once the groundcover is in place and stabilized the project can be considered a low maintenance project that involves Susan Sumey to have the responsibility to keep over 90%of the project covered with lowgrowth ground cover such as Crown Vetch or Sod. The Soil Conservation Service policy in Minnesota requires that all maintenance is the responsibility of the landowner(s). Before any assistance is provided,the landowner(s)must sign an agreement stating that they are responsible for the maintenance of the installed practice. The SCS may assist with suggestions for maintenance only. Lakeshore protection or slope protection may be disturbed by ice action or by water runoff larger than those used in design. These conditions can only be addressed by designing flexible protection and that is easy to repair or replace with a moderate maintenance effort. The design and installation will be done to the best of the designers ability and knowledge, and maintenance is totally the responsibility of the landowner(s). There are unpredictable sources of problems for Lakeshore and slope protection-ice jacking and Waterlogging. Ice Jacking is a phenomena that involves the freezing and thawing of the lake surface. When the ice expands in freezing, it pushes up and outward against the shores of the lake with very large pressure which can move almost any type of protection measure. Flexible measure such as riprap can be pushed up and out of place leaving holes in the protective layer. These holes can allow undermining of the protective layer and loss of its effectiveness. Semi-ridgid measures, such as precast concrete blocks, can start to unravel, and rigid measures, such as a concrete wall, can be cracked beyond repair. Waterlogging is a phenomena that occurs when the internal strength of soils can decrease when it becomes saturated by groundwater and seepage flows within the bluff. The added weight of buildings and other structures can increase stresses on the soil and contribute to slope failure. Erosion problems are common along bluff shorelines where a variety of forces and processes act together. The most prevalent causes of bluff erosion and recession are occur at the toe(base)by waves and instability of the bluff materials themselves. A typical bluff often consist of layers of different soils, which do not stand permanently at a vertical face. Failure of the slope depends on the nature of the material. A cohesive material (clay)will move as large blocks either by toppling due to undercutting or by sliding out in a curved arc. Granular material (sand or gravel)will erode easily by flowing water and wave action. Vertical sided blocks will drop due to and undercutting of the slope or the soil will suddenly flow down an inclined plane. Height is a factor because high bluffs (over 20 feet) impose greater stresses and are likely to have more severe stability problems than low bluffs. The Design for the Susan Sumey project does not try to design against these unpredictable forces. The Landowner(Susan Sumey)should be told of these phenomenas, and instructed on maintenance of their measure should they occur. The Soil Conservation Service policy in Minnesota does not allow installation of high-maintenance protection for a single landowner without proven means to maintain the installation. An example of a high-maintenance measure is artificial nourishment. The technician, conservationist, or engineer involved in the project should discuss maintenance with the landowner prior to design of the measure. A maintenance plan should be prepared by the designer for the specific job. It should be discussed with the landowner. The Landowner must be aware of their responsibility in this area, and sign a maintenance agreement prior to the installation of the measure. The plan must be attached to the O&M agreement signed by the landowner. Sincerely, *1" 44117 Stephen Spartz July 29, 1993 From: Landview Landscaping 3670 Hwy 7 Excelsior, MN 55331 Stephen Spartz To Advance Surveying&Engineering Co. 5300 S. Hwy. No. 101 Minnetonka, MN 55345 Jim Parker Attention Jim Parker, Landview Recommendations for Design and Maintenance. DESIGN. (recommendation)See Attached Diagram. 1. Fill Material(Clay with a Mixture of Granular) a. Clay will provide the necessary Cohesive characteristics for a(1.1)slope. b. Granular will provide the necessary Drainage Characteristics to help prevent Waterlogging. 2. Anchors, Pipes and Miragrid 5T. a. Anchors create stability of fill to existing dirt plane. b. Pipes provide for attachment of Miragrid 5t to the Anchors. c. Miragird 5t. provides soil stabilization and internal Strength. d. Topsoil promotes lowgrowth erosion control vegetation such as Crown Vetch. Maintenance. (recommendation.) 1. Ground Cover(Crown Vetch& Bird Foot Tree Foil.) Homeowner must keep supplied necessary seed incase of dyeout. Recommended keep 2-5 pounds in storage. Water every two days until ground cover has taken root. 2. American Excelsior Erosion Control Blanket. Installed after project is completed and home owner must keep in stock 2 rolls(8'X 90')in case of washout or erosion due to large downpour after installation. If erosion occurs call contractor fix erosion and reseed and cover with erosion control blanket. 3. Homeowner must immediately contact contractor incase of problems after installation. 4. The silt fence must be kept up and well maintained until 90%of project is well rooted and vegetated. 5. The Homeowner has the responsibility to keep over 90%of the project covered with lowgrowth ground cover such as Crown Vetch. We recommend the Crown Vetch and American Excelsior Erosion control blanket for the following reasons. Recommended Maintenance. Crown Vetch is used by the DOT along side roadways where there are slopes such as 1:1 and through experience have had better success than sod for erosion control. American Excelsior Erosion control Blanket. A.Interlocking Curlex(Curled, Barbed)Wood fiber Mat. 1. Conforms to the soil to prevent erosion by holding soil and seed in place during revegetation. Protects form water flow, wind, and rain drop erosion. 2. no need for bottom net, sewing, or gluing to hold fibers. 3. Controls temperature fluctuation of the soil. B. Documentation-Curlex has been hydraulically tested and design parameters are listed in #FHWA-Ip-87-7 Hydraulic engineering circular#15"Design of roadside channels with flexible linings 1. Engineers can justify their design based on documented research. C. Absorbs up to five times its weight in moisture and swells as it absorbs. 1. Fibers become very active as they swell and cling to the soil and vegetation to lock into place. 2. Swelling action increases height profile to provide a rough surface which will slow water flows down. 3. Does not require costly follow-through watering. D. Hygorscopic 1. Gives moisture back to plants as needed during germination. E. Neutral PH • 1. Will not heat up and burn up seed during decomposition. F. No Weed Seeds 1. Establishes vegetation free of unwanted weeds (This is very important in the growing market of residential development.). G. NO Pitch,tar, or resin 1. No Harmful substances to leach out and hamper revegetation (as pine and poplar blankets do). H. Smolder resistant 1. Will not burn or smoke from lit cigarettes. I. 50 Square yard 1. Easily handled and installed by one person. J. 8'width(X90' length) 1. Wide width is a natural for short. Wide slopes, extra wide ditch lining's or may other applications. American Excelsior VS Sod 1.Curlex is cost effective as compared to sod, usually no more than 50°%of the installed cost. 2. Curlex does not require costly watering follow though. 3. Watered sod tends to trap moisture in itself and promotes lateral root growth which leads to sun burnout of sod. Common on Steep slopes. 4. Curlex can be stored on site as used as needed. Great for emergencies. 5. Sod is more labor intensive, one truckload of curlex equals 24 truckloads of sod !! Contract Terms of Responsibility for Project Design and Maintenance. The Maintenance of the above project is the responsibility of the landowner. Susan Sumey is responsible for the maintenance of the installed project. Landview Landscaping will assist with suggestions for maintenance only. Lakeshore Protection or slope protection may be disturbed by ice action or by water runoff larger than those used in design. The Landowner, Susan Sumey has been notified of the unpredictable sources of problems for lakeshore and slope protection such as ice jacking and waterlogging. These Conditions can only be addressed by designing flexible protection and that is easy to repair or replace with a moderate maintenance effort. The above design and installation has been done to the best of the Designer's (Stephen Spartz's), knowledge, and maintenance is totally the responsibility of the Landowner(s) (Susan Sumey). I, Susan Sumey, hereby understand that the above project does not try to design against the unpredictable forces such as Icejaking and Waterlogging. I have been told of these phenomena's, and was instructed on maintenance of their measures should they occur. Stephen Spartz has discussed the above maintenance plan and has made me aware of my responsibility in this area X Home Owner Susan Sumey I, Stephen Spartz, do not allow installation of high-maintenace protection for a single landowner without proven measures to maintain the installation. The design and installation will be done to the best of my knowledge and ability, and does not try to design against the unpredictable forces such as icejacking and waterlogging. The maintenance of the project will be the total responsibility of the landowner(Susan Sumey) 14*V41.41 44— Landview Landscaping Owner Stephen Spartz