10-10-1988 - Agenda Packet City Council - regular meeting

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Zoning File #1305 September 28, 1988 Page 2 of 4 Review of Application - Please review Exhibit F, a letter from Robert Sorenson, Architect of the Vogt Corporation representing the applicant advising that the stockpiled earth was re -graded by the contractor in error. The contractor was stopped as soon as it was realized but at least 85% of the work was completed. The final grading has not been realized nor has the swale along the base of the newly graded are- along the west lot line been installed. Staff has inspected the site on September 21st and can confirm that nothing has been done since the original inspection of the week of September 12th. Please review Exhibits B, D, and E, as staff noted in the first review, the quality of the run-off was not going to be a major concern as a result of the new addition and proposed grading. In light of the very sensitive drainage area that the property is located within, the Watershed District did ask for an analysis of the effects of the additional hardcover based cn the 100 year storm event (pre and post development). The applicant was then advised that they would then be responsible for following the guidelines and standards of the District, which was that based on the pre and post calculations, with the new improvement, run-off could not leave the property at a greater rate than prior to the new improvement. McCombs Frank Roos Associates have prepared the necessary hydrolic information and have prepared the final drainage plan for the M.C.W.D. permit review. The final approved drainage plan calls for the construction of a storage pond, constructed within along the proposed swale to the east of the re -graded area along the west side of the property, approximately 200' east of the west property line. The storage pond will be constructed by cleaning out and lowering the bottom of the existing drainage ditch in the area shown on the attached plans (Exhibit G). The retention pond shall flow along the south border to the southeast corner and outlet to the drainage ditch and finally to the railroad tracks. The drainage pattern is still the same as approved on the original plans (Exhibit C) except that we will not ask for a retention pond in the southeast corner. Approximately 90% of the drainage from the hardcover from the new addition is located in the 8+ acre watershed to the west and south of the building.