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METROPOLITAN <br />C O U N C I L <br />DATE: 1/25/2017 <br />FROM: Dan Chouinard <br />Centerville Rd.: <br />Emergency Repair and FM <br />Replacement <br />Memorandum <br />Environmental Services Division <br />SUBJECT: Centerville Rd. Interceptor 7651 Emergency Repair and Improvements <br />GENERAL <br />• Typically L04 pumps through interceptor 9708, a 12" PVC pipe. <br />• During September, 2014, MCES Operations switched flow over from 9708 to Interceptor <br />7651, a 10" DIP pipe, to prepare for a vertical realignment to accommodate new City storm <br />sewer. <br />o Ultimately no vertical alignment adjustments were made to either force main where <br />they cross Centerville Rd. because the City made the decision that it was okay to <br />reduce the planned 48" storm sewer to a 36" equivalent arch pipe. <br />• On October 6, 2014, MCES Operations responded to a City of Centerville report of a <br />possible wastewater leak that was undermining Centerville Road at Meadow Lane. MCES <br />crews responded with vactors to recover spilled material and provide traffic control to <br />protect the undermined roadway. Vactored flow was reintroduced to the interceptor system <br />at L04 after Operations switched flow back over to Interceptor 9708. <br />o The segment where the 10" DIP crosses Centerville Rd. (at Meadow Lane) was <br />replaced with 10" PVC (encased in 16" Steel pipe). <br />• A flow analysis was conducted after the emergency response to determine approximately <br />how much wastewater was hauled and reintroduced upstream of L04 during the spill. <br />i <br />M220_F-M210 'M220_F-M210Baseline <br />10/5/201416:00 121 <br />10/5/201417:00 95 <br />110/5/2014 18:00 <br />137 <br />110/5/201419:00 <br />46 <br />10/5/2014 20:00 <br />71 <br />110/5/2014 21:00 <br />70 <br />110/5/2014 22:00 <br />62 <br />i 10/5/2014 23:00 <br />77 <br />10/6/2014 <br />18 <br />10/6/20141:00 <br />65 <br />10/6/2014 2:00 <br />45 <br />10/6/2014 3:00 <br />30 <br />10/6/20144:00 <br />-13 <br />10/6/20145:00 <br />56 <br />i 10/6/2014 6:00 <br />23 <br />1 10/6/2014 7:00 <br />21 <br />10/6/2014 8:00 <br />86 <br />10/6/20149:00; <br />87 <br />_ <br />J10/6/2014 10:001— <br />_ <br />— - 80 <br />102; <br />106'. <br />!Theoretical <br />'Release Hourly Total <br />89;(GPM) _.—';(Gallons) - --- <br />102561 3371i*Appeared leak bbW <br />92 _ .... 221 - -- _. 12991 <br />i <br />111 <br />-- - <br />411 <br />--------- <br />2445: <br />- +�-�=i <br />12664 <br />3&l6i <br />109 <br />32 <br />t <br />95 <br />771 4614! <br />66 <br />it <br />I <br />76157 <br />---- _ <br />12! <br />— - -- <br />7241 <br />--- ? ---i-----.�.--- <br />— E ---. <br />49 <br />18 <br />11021 <br />28 <br />401_ <br />2416: 1 <br />43 <br />-14 <br />-827! <br />26 <br />3..' <br />171' <br />59 <br />_ <br />381 <br />_ <br />2291E _.------- —--�----- <br />--- <br />121 <br />35; <br />2119109:15 station stop pumping thTuh old Forcemain <br />128, <br />87' <br />25571 Total Gallons of Theoretical Release <br />j <br />31 <br />