04-28-2003 Council Packet - Laserfiche WebLink

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An additional construction entrance should be installed at the proposed temporary access offor Willow Drive to the sales trailer. All slopes three to one (3:1) slopes or sleeper should be blanketed, not mulched, for temporary protection during seed establishment. Blankcu should be a minimum of MnDOT Category 3. The required staple pattern shall be a minimum of 1.S per square yard. There should be some identified channelized (low between housing units. These areas should be protected by blankets or sod. Curb line protection during home construction and after the streets have been paved will be required and should be outlined in the temporary erosion control plan. Limited protection Is shown for the pond/wetland just to the north of the construction entrance off Willow Drive. Silt fence should be added to the NWL of that pond to prevent sedimentation. Heavy-duty silt fence should be installed north of the two proposed units between Bridgewater Drive and Boulder Drive. The first paragraph in Spec section 2370, part 1.05 should be revised to read; "If any portion of the project is expected to be exposed longer than two (2) weeks one (I) week, the exposed soil shall be covered with straw mulch at the rate of 2000 pounds per acre and punched into the soil by rolling a straight set disc over the area. If the soil will be exposed longer than eight-(g) weeks three (3) weeks, the disturbed soil area shall be seeded with perennial rye seed mix at a rate of 75 pounds per acre and mulched. Any pipes or conveyances connecting to flowing water should be stabilized within 200 feet prior to their connection. This is to prevent any conveyance of sediment to the defined wetland areas. Stabilization means blanketed or sodded. The individual(s) responsible for erosion control plan design, and implementation should be outlined and provided to the city engineer prior to construction. Streets shall be swept daily unless otherwise approved by the City. Retaining walls that exceed 4-feet in height require an engineered design and City review and approval. Financial Guarantees: • We have estimated the cost of site improvements (utilities, streets, grading and landscaping) to be $2,696,000, the itemized estimate is attached. The applicant should provide a financial guarantee of 1505b of this amount or $4,044,000 prior to any work on the site. The financial guarantee can be reviewed and reduced periodically as work is completed and accepted. The financial guarantee should never be less than $75,000 until the job is completed and the City has accepted all work. • The developer should provide an additional and separate financial guarantee in the amount of $30,000 to ensure that all monumentation is set or will be set within one year after plat recording in accordance with new Hennepin County policy. The financial guarantee should be held until all required monumentition is in place. • The developer should provide an additional and separate financial guarantee in the amount of $50,000 to insure compliance with erosion conuol measures. The erosion control guarantee should be held until the project is completed and vegetation is established throughout the site. • All financial guarantees should be in the form of an irrevocable letter of credit or cash. Please contact me at (651) 604-4863 if you have any'questions regarding this matter. Yours very truly, BONESTROO, ROSENE. ANDERLIK & ASSOCIATES. INC. Tom Kell.»^g Cc. Greg Gappa, City of Orono Jik.juau.