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•TKDA <br />TOLTZ, KING, DUVALL, ANDERSON <br />AND ASSOCIATES, INCORPORATED <br />ENGINEERS • ARCHITECTS • PLANNERS <br />MEMORANDUM <br />1500 PIPER JAFFRAY PLAZA <br />444 CEDAR STREET <br />SAINT PAUL, MINNESOTA 55101 -2140 <br />PHONE: 651 /292 -4400 FAX: 651/292 -0083 <br />To: Jim Studenski Reference: Drainage Review for <br />Copies To: John Powell Russian Baptist Church <br />From: Stephen W. Hartley <br />Lino Lakes, Minnesota <br />Date: June 21, 2002 Commission No. 12475 -002 <br />The following documents were used to review the Russian Baptist Church site plan: <br />4111 • TKDA's Review Memo dated May 1, 2002. <br />• HydroCAD Model dated May 30, 2002. <br />• Report of Subsurface Exploration and Geotechnical Review dated November 9, 2001. <br />• Plan Set dated and signed April 8, 2002, and revised May 31, 2002. <br />• Response Letter to City dated June 5, 2002. <br />After reviewing the above documents, I have the following comments. New comments are <br />shown in bold: <br />1. The 2 -year and 100 -year existing and proposed condition drainage computations have <br />been submitted. The 10 -year drainage computations also need to be submitted. <br />The 10 -year drainage computations have been submitted. The project will meet the <br />flow rate requirement for the 10- and 100 -year storm, but not the 2 -year storm. The <br />proposed condition flow rates are .2 cfs over existing conditions. The proposed <br />outlet is already a 4 -inch orifice. This really is the smallest practical size for an <br />orifice, otherwise clogging becomes an issue. Therefore, the slight increase in <br />discharge rate is acceptable. <br />2. Supporting information for the Curve Numbers and "Direct Entry" Time of <br />Concentrations computations need to be submitted. <br />Supporting information has been provided. All concerns have been addressed. <br />An Equal Opportunity Employer <br />