1995-02-27 Regular Meeting - Laserfiche WebLink

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CITY OF LA PORTE INTER OFFICE MEMORANDUM February 21, 1995 TO: Ro ert T. Herrera, City Manager FROM. fteve Gillett, Director of Public Works SUBJECT: Sewer Problem - Farrington @ Collingswood Several weeks ago, the CityyIs TV and Cleaning contractor, AAA Pipe, televised the 8" sewer between Collingswood and Winding Trail from Farrington Blvd. to Valleybrook due to continual maintenance problems. The line serves over 100 homes in Fairmont Park. Severe deterioration was noted throughout the line, with a missing roof segment at the manhole in the yard at Collingswood and Farrington, just prior to emptying into the trunk main along Farrington. The line is over 18 feet deep at this point. A crew was dispatched to attempt to slipline a segment of pipe ( 6' ) in the missing segment, with limited success. Since that time, the line has continued to collapse, until Thursday, February 16, 1995, when jetting could no longer open the line to flow. Rainfall during this time compounded the problem. A plan was developed to establish by-pass pumping from the manhole to Farrington with a temporary lift station designed and installed in the manhole by the Utility Division on Friday, February 17. The installation is functioning well, and should perform until permanent repairs are completed. Soils are saturated from recent rain. It is planned to allow the ground to dry, assisted by elimination of sewer flow through the collapse area, and then reattempt to jet through the collapse and slipline a section of pipe from the manhole to complete pipe. If this is successful, trenchless technology (Insituform, sliplinning, etc.) can be used to rehabilitate the entire section for a permanent repair. If this plan is not successful, quotes will be solicited from contractors to perform a conventional point repair by excavation and replacement, with trenchless technology used to complete the repair as outlined above. obviously, with the depth and location, this method will be much more costly and time consuming, as well as disruptive to the resident. I will keep you informed of progress. xc: John Joerns, Assistant City Manager Fred Thompson, City Engineer EXHIBIT A.