07-09-2003 Council Agenda - Laserfiche WebLink

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MEMO To: From: Subject: Date: Little Canada City Council Joel Hanson, City Administrator Lee Elfering, City Engineer Scully Drainage Review Proj. No. 808355J -0325 June 17, 2003 Howarc R. Green Company We have reviewed the current drainage system on the north side of Kohlman Lake and compared this with the predeveloped condition of 1965. The documents, which were reviewed, include the following: Aerial topography map prepared by Chicago Aerial Survey, dated May 1965 Aerial topography prepared by Markhurd, dated March 1981 Aerial topography supplied by Ramsey Washington Watershed, dated 1996 Aerial photograph prepared by Markhurd, dated May 1996 USGS quadrangle maps Topography field surveyed by HRG in the fall of 2001 City of Maplewood storm sewer system map of the N' /2 Sec. 4, T 29 R.22 dated February 1998, Preliminary Plat of Voyvera Lakeside prepared by Georgi— Schmidt & Assoc., dated Oct. 3, 1980 Preliminary plat of Beam Lakeside Addn. Prepared for Voya Piletich, dated September 18, 1981 Grading Plan for Beam Lakeside, Prepared by James P. DeBenedet P.E., dated Dec. 2, 1981 Drainage calcs for Canada Woods West, Prepared by Ken Gust, dated Sept. 17 and Nov. 8, 1993 Grading plan for Canada Woods West Prepared by Ken Gust, dated June 29, 1994 The purpose of this review is to determine the following: • The effects of the berm construction and other grading on drainage patterns in the area west of the berm. • Model the existing pond to determine the effectiveness of treatment and detention of storm water from the development within Maplewood. Wetland / Water Quality Protection It is apparent that the rules and regulations regarding wetland protection and storm water treatment have become more and more stringent through the years. However, prior to 1975 there were no wetland protection rules in place. The following is a short listing /timeline of significant actions that have taken place: 1975 The Ramsey Washington Watershed District was established. 1977 Federal Water Quality Act Adopted 1987 Corp. of Engineers Wetland Protection Policy Wetland Delination Manual Published 1989 No loss policy adopted in Watershed (required 1:1 replacement) C: \WINDOWS \Temporary Internet Files \OLKF1A3 \Sculley Drainage Findings.doc 2-