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Maintenance Rehabilitation Codes <br />91 - Remove Flush Valve from Manhole <br />Older systems sometimes had a water line and valve installed in selected <br />manholes located on lines with low flows. By turning on the water, additional <br />flow was created to flush the line. These old installations should be removed. <br />92 - Other Utilities Pass throu Manhole <br />In older systems, it is not uncommon to find other utilities passing through a <br />manhole. These lines can pose a safety hazard to workers entering the manhole, <br />become UI sources, and create dangerous conditions for the public if the utilities <br />include water or gas conduits. <br />ADS Environmental Services, Inc. <br />VI-26 <br />