08-27-2003 Council Agenda - Laserfiche WebLink

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Honorable Chairman and Planning Commission July 9, 2003 Page Three General Comments The addition of the retaining walls both within the right -of -way and on the wetland side of 10 of the 15 lots brings up concerns that were not present when no walls were being used. The largest retaining wall within the road right -of -way is being used to support the road and the public utilities, and a majority of the retaining walls used within the lots are being utilized to support the building pad areas. We have concerns that failure of the retaining walls could cause significant damage and possible harm. If retaining walls of the height indicated on the plans (10 -feet) are constructed within the right -of -way to support public improvements, it may be beneficial to the City that the walls be concrete poured in -place walls due to the reduced risk of failure. It is also recommended that the development association be responsible for any and all costs to repair or replace the retaining walls within the right -of -way or any damage caused to the public utilities due to the wall's failure. Soils information and the wall design should be submitted and approved prior to construction of any retaining wall. The retaining walls within the lots will not support any public improvements, but are being used to support the building pad areas. The wall design will need to be modified for each wall depending on how close the home will be constructed. In addition the drainage swales that run along the north /south lot lines will convey water along the bottom of the wall, care will need to be taken to ensure that erosion does not undermine these retaining walls and cause a failure. These are our comments based on the review of the resubmitted documents. All items listed above should be addressed and the storm pipe calculations received and reviewed prior to final approval by the City. If you have any questions regarding these comments please feel free to call. Sincerely, Howard R. Green Company Lee Elfering, P.E. City Engineer C: Joel Hanson, City of Little Canada Greg Schroeder, City of Little Canada Steve Grittman, City Planner NEC Inc. C: \windows \TEMP \Itr 07 -09 -03 ping commission.doc