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5. Existing individual systen iinprovements - the on-site <br />Htanagesient program is expected to continue enforcing major <br />improvements to» or replacesient of» 15-20 existing on-site <br />systems each year through the 1990-2010 period. <br />Kjipectsd Sever Coaaeetioas and Oa-site Zastallatlons# 1991-2000 <br />CSTIHATCO <br />COBBItTlOWS TO <br />SANITARY tWCR 1991 1992 1993 199« .995 1996 1997 1999 1999 2000 TOTAL <br />1980-90 <br />TOTALS <br />NEWLY CONSTROCTED <br />UNITS <br />EXISTING UNITS <br />NEWLY SEWERED <br />190 <br />20 124 <br />TOTAL SEWER UNITS <br />ESTIHATIO ON-SITE <br />INSTALLATIONS <br />2:0 <br />NEWLY CONSTRUCTED <br />UNITS <br />REPLACEMENT OR <br />MAJOR REPAIRS <br />250 300 <br />210 <br />TOTAL ON-SITE <br />UNITS <br />510 <br />J. Imflltrmtion/Iiiflow Abmt< <br />In 1981, Bonestroo and Associates completed an <br />infiltration/inflow (I/I) analysis of the Orono sanitary sewer <br />col Section 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 />infiltration/inflow to the system and recommended abatement <br />measures. <br />Infiltration is defined aa the water entering a sewer system <br />and service connections from the ground through such means as, <br />but not limited to, defective pipes, pipe joints, connections, or