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TELE <br /> -SCAN, INC. <br /> TELEVISED PIPELINE INSPECTION <br /> 6275 East Rt. 36 • Decatur, IL 62521 • 217/864-2940 <br /> November 10, 2008 <br /> City of Decatur <br /> Attn: Matt Newell <br /> One Gary K. Anderson Plaza <br /> Decatur, IL 62523 <br /> Re: Critical Sewer Study <br /> TeleScan Inc. was advised by city staff to direct our inspection efforts towards <br /> the Critical Sewers. <br /> Critical Sewer Definition is as follows: <br /> A large "Trunk" line carrying a large amount of sanitary & storm combined <br /> effluent to the Sanitary District Interceptors or to the Sanitary District Plant itself. <br /> Major structural damage and/or collapse of these sewers could have a drastic <br /> effect on some of the major roadways, other major utility trunk lines and even <br /> homes and buildings in the path of these critical sewers. <br /> City staff and TSI determined that twelve separate large diameter systems met <br /> the criteria for critical sewers. In the following pages you will find a brief system <br /> summary and photos from select critical sewer locations. <br /> All Sewers have finro distinct areas of concern. The piping and the MH structure <br /> themselves; in this critical sewer program no manhole inspections have been <br /> done. A cursory inspection of the MH's done with the cameras as they travel <br /> through the system is always done and major structural issues with the manholes <br /> can usually be found this way, but a direct hands on MH inspection of these <br /> structures has not been started as of yet. <br />