Agenda - Council - 07/23/2002 - Laserfiche WebLink

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· Sheet 14 of 16 - In regards to the integral base manhole; if adjustment exceeds 10", a barrel section shall be used. Also add note: "All manhole structures not located in paved area must be marked with a green carconite stake. · Sheet 15 of 16- Change the heading to "Resilient Seated Valve". Add note: Ail valves not located in paved area must be marked with a blue carconite stake. · Sheet T-1 - Final alignments needs to be approved by the City Engineer. Initial discussions with residents indicate that the storm sewer line on 155th Lane NW should be installed 4-6 feet from existing curbIine but shall remain outside of wheel paths. All existing trees must be protected by the use of trench boxes wherever possible. Additional pipe or grading work will need to be added in Woodland Green Park to ensure positive drainage to NE comer of park. Storm sewer on Barium St. should be located to the west side of the road. · Sheet T-3 Both Alternatives- Grading of swale in park not included. Please submit. Staff also has the following general comments regarding specifications coma/ned in the construction plans: a) All manhole and catchbasins shall use an infishield with a minimum thickness of 60 ml to seal the outside of the casting and rings to control inflitration and inflow. See manufacturer's recommendations for installation instructions. b) All manholes and RSVs that are constructed outside of paved areas must be marked with green and blue carconite stakes respectively. c) Section 16, B-3 (SP 7 of 21) shall state "Keep the grade +4 and -4 inches of that shown on the plans from Manhole 106 (T-3) to Manhole 103 (T-3). d) On SP 10 of 21, valve extensions shall conform to Detail Sheet 15 of 16 and be installed to a point no less than 1 foot below the proposed grade. e) On SP 17 of 21, remove the sentence: Pavement smoothness shall be waived for this project. f) The off-site stormwater improvement plan will be reviewed by Hakanson Anderson Associates, Inc. and the plan shall be modified as required by review letter prepared by Hakanson Anderson and Associates, Inc. Sound Mitigation: It is the City's responSibility to take reasonable measures to ensure compatibility between land use and traffic noise generated from an adjacent highway. After a traffic noise level study conducted by SRF, Inc. it has been determined that a 10-foot sound wall or a combination of berming and sound wall must be completed as part of this development. Sheet 11 of 16 contains the details of the sound wall. The sound wall shall be built to these standards subject to any comments from the City Engineer. Stormwater Management Fee. The current stormwater management fee is $375 per unit. There are ultimately 110 units proposed for this development, therefore there would be $41,250.00 due for stormwater management for this development. The construction of the storm sewer offsite of the subdivision is estimated at $175,200.00; of which this development would be responsible for $66,226.00 (37.8% of the total project cost of $175,200.00); which exceeds the amount that would be collected by the City. The City will allow the use of the funds due ($41,250) for this development when the storm sewer outlet is accepted, in place and operational and the City is provided proof of the financial transaction between you and the contractor of the offsite storm water trunk improvement. The City has requested that -07-