03-14-1979 Council Agenda - Laserfiche WebLink

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comniLi 350 METRO TOURRE BLDG. 7TH6 ROBERTfTREET/ /RIM PAUL mn 5510: bit 2228423 March 1, 1979 Joseph G. Chlebeck, Clerk City of Little Canada 515 Little Canada Road St. Paul, Mn. 55117 Dear Mr. Chlebeck: This letter is to inform you of the wastewater flow volume from your community in 1978 and its impact on operating the Metropolitan Disposal System. The Commission has determined the actual waste water flow volume from your community to be 267 million gallons (MG) in 1978. The total wastewater flow volume collected and treated in our facilities did increase considerably in 1978 (91,503 MG) from the flows in 1976 (84,700 MG) and 1977 (85,307 MG). This increase in flow is in part due to increased population served by the system and in part due to increased wet weather wastewater flow volumes. It is the latter increase that concerns the Commission in that these flows cause a peak flow condition which did exceed the capacity of our interceptor and treatment facilities in some areas. These conditions not only increase the operating costs of the system, but also makes it very difficult for the Commission to collect and treat a wastewater and meet the NPDES permit limits. In 1978 there were a number of rainfall events which resulted in over two (2) inches of precipitation. Most communities in our service area received several of these precipitation occurrences and many communities experienced problems of impoundment of surface water drainage due to inadequate natural and artificial (storm sewer) drainage systems. As a result some separated sanitary sewer systems together with combined sewer systems were subjected to receiving this surface water inflow. This inflow originates from: (1) surface water drainage into inundated manhole openings; (2) yard and roof drains connected (intentionally or unintentionally) to the sanitary sewer; and (3) foundation or sub -soil drainage connections to the sanitary sewer. It is requested that you furnish the Commission with information regarding identified problems of infiltration /inflow (I /I) experienced in your community in the past year and what has been done to reduce or eliminate this problem. It is important that some effective program to remove all inflow and excessive infiltration sources be undertaken as soon as possible. This I/I program status and other information should be provided at an early date and also be part of your comprehensive sewer plan. Your cooperation in this regard is appreciated. If you have any questions in this regard, please write to us. Very truly yours, arinik RiCfiard J. Dougherty Chief Administrator RJD:RAO:nc OiiyOF LITTLE CANADA