item 5.3 - Laserfiche WebLink

Home Browse Search

Mr. Scott Harlicker • October 17, 2001 Page Two will likely not be sufficient. It is highly likely that the City would look for a minimum of 80 feet to a maximum of approximately 100 feet of right-of-way. This plat should provide the appropriate right-of-way, anticipating a minimum of 80-foot wide total right-of-way width for Jarvis Street. It appears that this could easily be done even with the existing building on Lot 4, Block 1. 5. Staff discussion regarding 161st Avenue at the west end where it abuts up to the Youth Athletic Field/Cass property was that the road would likely never be extended into or through that City-owned property. Therefore, 161st Avenue should be designed with a cul-de-sac at the end of it. It appears that the cul-de-sac could be placed into Lot 10 and the lot lines adjusted between Lots 8, 9, and 10 to ensure that each has sufficient lot area to meet the City ordinance. 6. Based on a review of the drainage calculations that were submitted, the following comments are made: • No water quality treatment analysis was presented in the drainage calculations. The revised drainage calculations should go through a water quality analysis. • The curve numbers were shown in all cases to be lower after development than prior to development. However, there was no justification shown for these projected curve numbers. In our experience, just the opposite should happen, as the area develops with rooftop and parking lot, typically more runoff from storm events can be anticipated. Curve numbers should be re-evaluated and a detailed discussion of how • the curve numbers were derived should be included in the revised storm drainage calculations. • The outlet at the northwest corner of this area appears to flow off onto private property. No mention of how this will be dealt with or impacts on the adjacent property is contained in the storm drainage calculations. The revised calculations should detail any impacts to the adjacent private property from the storm water discharge. 7. The grading plan should indicate the emergency overflow elevation and location for each of the three proposed drainage ponds on the site. 8. It has been the City policy to not allow commercial and/or industrial property to have its site runoff discharge directly onto the public street. Additional storm sewer should be provided in the project to allow for internal collection of stormwater from each of the lots. 9. The proposed road section on 161st Avenue and Buchanan Street is a 40-foot wide urban street section with concrete curb and gutter. Currently, the concrete curb and gutter is proposed to be a mountable style. This needs to be changed to a barrier style of concrete curb and gutter so that specific driveway openings can be designed and built to control the traffic flow throughout the development. If you have any questions regarding these comments, please call. Sincerely, Howard R. Green Company .. i I%///Irate-L) • Terry J. lurer, P.E. TJM:tw Howard R. Green Company Ltr 10-17-01 Harlicker.rev CONSULTING ENGINEERS