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5. Existing individual system improvements - the on-site <br />management program is expected to continue enforcing major <br />improvements to» or replacemen'f of» 15-20 existing on~site <br />systems each year through the 1990-2010 period. <br />Expected Sewer Connections and On-site Installations/ 1991-2000 <br />ESTIMATED <br />CONNECTIONS TO <br />SANITARY SEVIER 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 TOTAL <br />1980-90 <br />TOTALS <br />NEWLY CONSTRUCTED <br />UNITS 6 8 10 10 10 10 10 10 5 5 86 190 <br />EXISTING UNITS <br />NEWLY SEWERED 2 2 40 20 15 10 10 10 10 5 124 175 <br />TOTAL SEWER UNITS 10 10 50 30 25 20 20 20 15 10 210 365 <br />ESTIMATED ON-SITE <br />INSTALLATIONS <br />1 <br />NEWLY CONSTRUCTED <br />UNITS 5 10 25 35 35 30 30 30 25 25 250 300 <br />REPLACEMENT OR <br />MAJOR REPAIRS 30 30 20 20 20 15 IS 15 15 15 195 210 <br />TOTAL ON-SITE <br />UNITS 35 iO 45 55 55 45 45 45 40 40 445 510 <br />J. Infiltration/Inflow Abatement <br />In 1901, Boncstroo and Associates completed an <br />infiltration/inf lew (I/I) analysis of the Orono sanitary sewer <br />collection systen.. 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 />infiltration/inflow to the system and recommended abatement <br />measures. <br />infiJuration is defined as the water entering a sewer system <br />and service connections from the ground through such means as, <br />but net limited to, defective pipes, pipe joints, connections, or <br />i <br />I