Laserfiche WebLink
Attachment G <br /> CMP Part 4C. Comprehensive Sewer Policv Plan <br /> Orono ezpects waste water strength to remain relatively low because of <br /> primarily residential service. Only 1% of the land area in Orono is designated <br /> as industrial and commercial. The predominant sewage characteristics will be <br /> typically domestic. Concentrations are expected as follows: <br /> Biochemical Ozygen Demand = 250 mg/1 Suspended Solids=250 mg/1 <br /> " The existing industrial park area serviced by the Orono Schools/Highway 12 <br /> system has the only potential for increased waste water strength. In the event that <br /> some future user may increase discharge strength, Ordinance No. 212 adopted in <br /> June 1978 and current Municipal Code Section 14-186 provides for extra-strength <br /> regulation and charges consistent with MCES requirements. <br /> � INFLOW&INFILTRATION(I/I)MANAGEMENT <br /> Water that unnecessarily enters the wastewater system as a result of inflow and <br /> infiltration (I/I), still must be treated at wastewater treatment plants. Infiltration is <br /> the seepage of groundwater into sewer lines through cracks or joints. Inflow is <br /> typically flow from a single point, such as the discharge from sump pumps or <br /> footing drains, or the entry of stormwater through openings in manhole covers. . <br /> The cost of treating this excess water is ultimately passed on to users of the <br /> wastewater system. <br /> Reduction of I/I helps to increase capacity in the metropolitan sewer system, and <br /> . ultimately delays the need for treatment plant expansions. In April 1993 the City <br /> adopted an UI reduction program as part of�an amendment of the Comprehensive� <br /> Sewer Policy Plan, and in 1994 ordinances were adopted that specifically prohibit . <br /> the discharge of groundwater and stormwater into the sanitary sewer system. The <br /> ordinances require inspections of private connections to confirm there are no <br /> illegal discharges, requiring compliance when violations are found, and imposing <br /> local surcharges for noncompliance. <br /> The City's ongoing UI reduction program included the following elements: <br /> 1. Regular inspection of manholes, sewer lines and lift stations to identify I/I . <br /> problem areas, included televising of sewer lines and where necessary <br /> smoke testing or dye water flooding. <br /> 2. Ongoing analysis of lift station pumping records to identify existing UI <br /> sources. <br /> 3. Ongoing flow data collection and analysis to identify new I/I sources <br /> quickly if they occur. <br /> 4. Ongoing rehabilitation of sewer infrastructure. <br /> 5. Public education program regarding I/I. <br /> � 6. Ordinance (No: 129, Second Series, adopted 10/24/94) prohibiting sump � <br /> pump discharge to sanitary sewer system, sump pump inspection program � <br /> to identify illegal discharges, and a $100/month surcharge for non- <br /> compliance. ' <br /> 7. Annual reporting to MCES. <br /> City of Orono Community Management Plan 2008-2030 Page 4C-63 <br />