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On June 29, 2011, Brush College Road was closed for a day to collect physical data at the underpass. <br /> The work included televising the storm sewers at the underpass to see if there were any blockages or <br /> other causes for poor drainage at the CN tracks. The televising results found approximately 500 feet <br /> of 24" and 36" sewer with a considerable amount of gravel debris in it. Roughly one-half of the <br /> capacity of the sewer was lost because of this. A picture of the sewer condition is shown below. <br /> Typical Debris in u _ <br /> F ' <br /> Brush College <br /> Road Storm Sewer <br /> Debris like this can be caused by a sewer laid with very little slope. The flow of stormwater slows <br /> and allows sand and gravel debris to settle to the bottom of the pipe. The storm sewer is in a location <br /> that is very difficult to maintain without completely closing the underpass; therefore, regular <br /> maintenance has not been performed on this storm sewer. <br /> Walden Associated Technologies was awarded the annual sanitary sewer cleaning project on July 5, <br /> 2011. They have been cleaning various sewers throughout the summer and fall and are nearing the <br /> end of their scheduled work for this project. This extra work differs from the original project in the <br /> following ways: <br /> 1. The sewers are for stormwater, not wastewater. Funds to pay for this work must come out of <br /> the Capital Improvement Fund and not the Sewer Fund. <br /> 2. A 36" sewer is included in this work and there is no pay item for this size pipe in the original <br /> contract. <br /> 3. The amount of debris in this pipe is excessive and could be compacted far more than in a <br /> typical sewer to be cleaned. <br /> A per hour rate for excess cleaning is included in the project contract and Staff proposes to use this <br /> pay item to pay for the cleaning of the storm sewers at Brush College Road. The Change Order <br /> addition will pay for 8 days of storm sewer cleaning. <br /> Walden will use sewer jetting trucks to clean the storm sewers. The trucks use high pressure water to <br /> loosen the debris and then vacuum the debris out of the downstream manhole. Water is used during <br /> the cleaning process; however, Walden has equipment that dewaters the collected debris. The excess <br /> water will be placed back into the storm sewer where it will then outlet into Lake Decatur. Net water <br /> Page 12 <br />