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(2^ <br />/ <br />NEW SEWER CONSTRUCTION DESIGN STANDARDS <br />All new sewer connections are inspected to preclude and prevent inflow from roof <br />drains, foundation drains, yard drains, sump pumps and cooling water drains <br />consistent with State Plumbing Code and MWCC requirements. All new sewer <br />connections are inspected to assure use of proper materials and construction methods <br />to limit the probability of future pipe breakage, defective joints or other sources ot <br />infiltration. <br />All new sewer construction, both individual connections and lateral extensions, will <br />conform to the following standards to minimize infiltration as follows: <br />The maximum allowable rate of ground water leakage shall be 100 gallons a day per <br />inch diameter of pipe per mile. <br />Manhole castings in areas subject to frequent flooding shall be located a minimum <br />of two feet above the ground level. <br />Manhole covers in areas subject to frequent flooding shall be solid, without vent <br />holes. <br />Inflow connections as described above shall be prohibited. A copy of the minimum <br />design standards for sewers is attached in the Appendix. <br />Orono expects waste water strength to remain relatively low because of <br />primarily residential serv ice. <br />Less than 1% of the land area in Orono is designated as industrial and commercial. <br />The predominant sewage characteristics will be typically domestic. Concentrations <br />are expected as follows: <br />Biochemical oxygen Demand = 250 mg/I <br />Suspended Solids = 250 mg/I <br />The existing industrial park area serviced by the Orono School's system has the only <br />potential for increased waste water strength. In the event that some future user may <br />increase discharge strength, ordinance No. 212 provides lor extra-strength regulation <br />and charges consistent with .MWCC requirements.