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( PAGE 2 :3 }9 i f r 3c�F lY "ATP '. ,L = . t+ = Y : Where ` doesrYwastewater ?01 a" o ?, - `} > tt try wV -AA T -. 117 ( schematic diagram -- not drawn to scale ) Mason Farm Wastewater Treatment ' [ Plant Manhole re IT - — Treated G ; ,,4 ft Effluent ravl �;_ sewer M 9w = " Ago Residential 0146 aln Morgan Service Lateral c� 1 Creek.�,I SJ� Gravi flow � 4{�S (to Jordan Lake ) Sewer Main ,I�o� Pump Station Characteristics of the Wastewater Management System Total wastewater volume received in 2000 -01 3 . 1 billion gallons IN Sewer mains maintained by OWASA 280 miles Number of pump stations 27 Number of manholes about 8 , 000 Wastewater Spills In 2000 - 01 , there were nine wastewater overflows in The total volume of the overflows equalled only about 0 . 1 % of our wastewater collection system . ( Please see the table the 3 . 1 billion gallons of wastewater received in the OWASA below. ) system from July 1 , 2000 through June 30 , 2001 . Causes of spills What we do to prevent spills ♦ Stormwater enters sewers through cracks and breaks , ♦ Inspect and repair, renovate or replace sewers and pump stations increasing volume of flows beyond pipe capacity, as needed to eliminate leaks and increase system capacity. ♦ Grease accumulates in sewers , causing blockages . ♦ Inspect and clear sewers with cutting and flushing equipment . Educate customers about proper grease disposal . ( See page 4 . ) ♦ Tree and shrub roots grow over time into sewer lines , ♦ Clear sewer easements to keep roots away from sewers ; limit creating blockages . plantings allowed along easements . - - - -- - - - - - - - - - - - - - ♦ Operate a continuous monitoring and alarm system ; maintain and ♦ Pumps stop working due to loss of power, power repair pumps ; use permanent and portable generators for back- up surges , mechanical failure , etc . power ; replace pump stations with gravity sewers when practical ; monitor and inspect pump stations to identify improvement needs . Month Spills Gallons Causes Effects Corrective actions July 3 3 , 009 , 500 Intense storm * , grease in sewer, No substantial or lasting Follow- up actions depend on equipment malfunctions effects , such as fish kills , the cause and severity of the are known . Overflows spill and may include clean - August 1 25 Grease and roots in sewer main which occur during in - up and disinfection ; inspec- September 2 1767000 Equipment malfunction , debris in sewer tense storms are diluted tion and clearing of mains ; in - by stormwater. Spills that creased maintenance ; repair, December 1 240 Deterioration of sewer main do not occur during renovation or replacement of March 1 50 Grease and roots in sewer main storms are small and pipes ; and in some cases , the June 1 1 , 880 Storm , leaks at pump station may be recaptured be - replacement of sewers or fore they reach creeks or pump equipment with larger Total 9 31187 , 695 or 0 . 1 % of total wastewater volume streams . capacity facilities . * Please see the additional information on page 4 regarding the overflow at the Rogerson Drive pump station . ( There were no overflows in the months of October, November, January, February, April or May. )