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Expected Sewer Connections and On-site Installations» 1991—2000 <br />ESTIMATED <br />CONNECTIONS TO <br />SANITARY SEWER 1991 1992 1993 1994 1995 1996 1997 1998 1393 2000 TOTAL <br />19d0-l990 <br />TOTALS <br />NE¥LY CONSTRUCTED <br />UNITS 10 10 10 10 10 10 10 10 10 10 100 190 <br />EXISTING UNITS <br />NCWLY SEWERED 10 10 20 20 20 20 <br />15 15 15 15 160 175 <br />TOTAL SEWER UNITS <br />ESTIMATED ON-SITE <br />INSTALLATIONS <br />20 20 30 30 30 <br />30 25 25 25 25 260 365 <br />NEWLY CONSTRUCTED <br />UNITS 35 35 35 35 35 30 30 30 25 25 315 310 <br />REPLACEMENT OR <br />MAJOR REPAIRS 20 20 20 20 20 15 15 15 15 15 175 210 <br />TOTAL ON-SITE <br />UNITS 55 55 55 55 55 45 45 45 40 40 490 520 <br />J. Infiltration/Inflow Abatement <br />In 1981r Bonestroo and Associates completed an <br />Infiltratlon/inflow (I/I) analysis of the Orono sanitary sewer <br />collection system. This report was in response to the Water <br />Pollution Control amendments of 1972 and the Clean Water Act of <br />1977. The study determined the degree of excessive <br />inflltratlon/inflow to the system and recommended abatement <br />measures. <br />Infiltration is defined as the water entering a sewer system <br />and service connections from the ground through such means asr <br />but not limited to, defective pipes, pipe joints, connections, or <br />manhole walls. By contrast, inflow is water discharged into a <br />sewer system and service connections from such sources as roof <br />leaders, cellar, yard, and area drains, foundation drains, <br />cooling water discharges, drains from springs and swampy areas, <br />manhole lids, storm waters, surface run-off, street wash waters, <br />or drainage. Although some infiltration and inflow is inherent <br />in any constructed sewer system, the objectives of reducing <br />excessive infiltration/inflow are: <br />1. The elimination of untreated wastewater bypasses and <br />overflows. <br />2.A lower total cost of treatment works. <br />ML