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Mr.Mike Gaffron Re:Orono Vilias <br /> , Page 5 13 November 2006 <br /> . ti. <br /> Lanc� Hoff Memo of '16 August 2006 �' � . <br /> 1. . The proposed site meets existing flow rates for the 2-yr, 10-yr, and 100-yr, <br /> 24-hour storm events. The table below summarizes our modeling <br /> resuits. � <br /> Storm Return Period . <br /> . Condition 2-yr 10-yr 100-yr � <br /> : . . Existing 1.3 4.7 10.4 <br /> : . Proposed 1.3 � 4.2 8.2 <br /> 2. The proposed pond has sufficient wet volume to treat runoff from the , <br /> . ��� 2.5", 24 hour Storm. <br /> � 3. A spot elevation or contour for the pond top of berm should be shown � <br /> on the grading plan. The pond should provide flood storage up to an <br /> . elevation of 959.5 as shown in the developer's submitted model. � � <br /> ' . � The top of berm has been revised to 959.5, see sheet C3.1. � � <br /> � 4. A pond outlet detail shou[d be provided. The pond outlet should � <br /> . provide skimming up to the 10-yr event. Low flow control is not <br /> � necessary for this site. <br /> A pond outlef detail has been provided, see sheet C4.9. . � <br /> � 5. The pond EOF elevation and location should be shown on the grading � <br /> � plan. The pond EOF should be located at or above the �00-yr HWL. � . <br /> The pond EOF elevation and location has been provided, see sheet � <br /> C3.1. The pond EOF elevation is 0.9-feet above the 900 year NWL. <br /> 6. 2' of freeboard should be maintained for the townhome adjacent the <br /> northwest rain garden (B.F. 1). . <br /> 2' of freeboard has been provided for all fownhomes adjacent to � <br /> . rain gardens, see sheets C3.9. <br /> � 100 NORTH SIXTH STREET SUITE 800C MINNEAPOLIS,MN 55403 <br /> OFrICE: 612.252.9Ci0 FAX:612.252.�u77 mvw.landform.net <br />