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Page 11 <br /> - ` ;�: 3 <br /> yt� <br /> ,�,t��`� r;;� t <br /> �� �� � � ���. <br /> �, ' C ITY af UN►�liTO <br /> �a ,.�� �,�R�. <br /> ��,�n ���o <br /> k������� � Yust UCficr ki�x 66•('ryecs�l E3ay, Minne�ota 5.�i32:�•hiunicipyl Offire� <br /> �a+, .q,�� �"�:`' `{' ' . <br /> `,a„`:�,�� ��,�� <br /> �,,�;��'�l,�,� On the 1Vorth Shore oj Lake 1Kinnetonka <br /> :::�;;.:�:%..t' <br /> July 21, 1981 <br /> Mr . George W. Lusher <br /> Chief Administrator <br /> rietropolitan Waste Control Commission <br /> 350 Metro Square Building <br /> 7th & Robert Streets <br /> St. Paul , Minnesota 55i01 <br /> Dear Mr . Lusher : <br /> Thank you for your letter addressing excess infiltration into <br /> Orono ' s sanitary sewer system and the Metropolitan Waste Control <br /> Commission system. <br /> The City of Orono initiated an approved infiltration/inflow (I/I) <br /> analysis program in September, 1980 . The study, as planned, includes <br /> the following procedures : <br /> 1 . Review all previous data pertinent to planning and construction <br /> of existing sewer systems. <br /> 2 . Review existing sanitary sewer system records and plans to <br /> determine sewers under lake levels affected by groundwater . <br /> 3 . Review problem areas such as backups, lift station problems, <br /> and sources of I/I . <br /> 4 . Obtain lift station flow data. <br /> 5. Locate meters and weirs to monitor and measure flows. <br /> 6 . Obtain treatment and transmission cost and flow data from the <br /> MWCC. <br /> 7. Monitor lift station and transmission flows during spring runoff <br /> and rainfall occurance . <br /> 8 . Analyze all data obtained during the study from each sewer <br /> district for the existence or non-existence of excessive I/Z . <br /> Hl Il Ut��.e1 L(��1�(, 1',3 7357 • AUNI�ISiIt>lIU1 � { ItiA`Ct 47!7)Sb • Pl BLI( NURKS - �'� �35v <br /> ���t ti51�i� <br />