1984-027 - Sewer failures on a 24 inch concrete pipe of the Central Interceptor

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Ex�iaz� - A GARRETT TO HENOERSON * 1982, pipe ine caved in three (3) times. One (1) full section twenty -four (24 ") inch diameter CMP was placed in the line and the r,,,, ;ainder was patched with half section CMP. LONG TO GARRETT * Pip -line as n repaired seven (7) to ten (10) times. Repairs varied from full section twenty -four (24 ") inch diameter CMP to half section CMP. Repairs totalled approximately seventy (70') feet. • In 1978, a tree fell into the pipeline just North of Long Street. • Curreetly a cave in approx seventy -five (75') feet North of the manhole at Lona. CAMPBELL TO LONG • 1979 pioel ne co apsed five (5) to six (6) times. Repairs were made with half section CMP and one (1) twenty (20') foot long full section twenty -four (24 ") inch diameter CMP. • Currently a cave in approx fifty (50') feet South of the manhole at Long Street. SHILOH TO CAMPBELL * 1983 pipeline co apse . Three (3) to four (4) times within a one hundred (100') foot reach. Repaired with half section CMP and one full section twenty -four (24 ") inch diameter CMP. * 4 -9 -84 Replaced three hundred (300') feet of twenty -four (24 ") inch line due to four (4) cave ins on that section the previous week. CHERRY TO SHILOH • Seven (7) to ten repairs varying from the inserting of a twenty (20 ") inch diameter CMP to the placement of half section CMP and total replacement of the original pipe with twenty -four (24 ") inch diameter CMP. • Major failure in 1982. City hired B A B Equipment to install one hundred (100') feet of polyethylene pipe. Spent $15,000 - $20.000 GRAHAM TO CHERRY • No previous repairs prior to Spring, 1984. • Coll'n ed January, 1984. City repaired approximately eighteen (18') feet with half section CMP. • Two weeks later pipeline collapsed immediately North of previous repair. City hired large backhoe and rented a trenchbox and aaein repaired twenty (20') feet to tewnty -five (25') feet with half section CMP. • Since those repairs, the pipeline has never had sufficient capaci'y to accommodate the Woodard Lift Station flow. The pipolin, is one -half to two- thirds silted in. We have tried to check cleaning the line and presently have hired a contractor with a bucket machine to drag the line clean. it was necessary to again excavate the line just to get a wire cable through it to accommodate this bucket machine. Spent $16,000 - $20,000 in 1984 Not including $5,000 - $6,uuO City Labor • Cleaning operation had to be shut down due to caving in of line during the cleaning process 4 -4 -84. HOUSTON TO GRAHAM • Seven (7) to ten 1 repairs with half section CMP covered with concrete. Four (4') to eight (8') feet in length each time. • Summer, 1982. Rain caused major collapse. City hired 8 6 8 Equipment and relaid three hundred (300') feet of polyethylene and concrete pipe. Spent $20,000. • December, 1983. Major collapse near Houston just South of the previous 1982 repair. SHERMAN TO BONHAM • No Repairs. BONHAM TO HOUSTON • No Repairs. Proposed location for Emergency Repair and ®�.4 Restoration of Central Interceptor.