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Draft Infiltration and Inflow Report March 1998
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Draft Infiltration and Inflow Report March 1998
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B. Rehabilitation Code Definitions <br />Manhole Rehabilitation Codes <br />01 - Install Inflow Dish at Manhole Cover <br />An inflow dish is a semi-hemispherical dish with a flat rim of the same diameter <br />as the manhole frame. When the cover is placed over the inflow dish, its weight <br />effects a seal between the inflow dish and frame, preventing inflow of water <br />through pick holes, vent holes, or a poorly seated cover. <br />02 - Install Manhole Cover Gasket <br />Some manhole frame and cover styles include a gasket which fits on top of the <br />manhole frame ledge which supports the cover or on the bottom of the cover. <br />This rehabilitation method addresses the replacement of the gasket. <br />03 - Pluiz Vent Holes in Manhole Cover <br />T'he simplest method for sealing vent holes in manhole covers subject to sheeting <br />or runoff is to use rubber inserts made specifically for this application. These <br />inserts are not a long term solution for manholes located in traffic azeas. <br />04 - Replace Manhole Cover <br />A missing or defective manhole cover creates both an inflow source and a safety <br />concern. This rehabilitation method addresses only the cover. In some older <br />installations, a new manhole cover and frame may be needed if the cover is of an <br />unusual style. <br />OS - Replace Missing Manhole Cover Bolts <br />This rehabilitation method addresses missing bolts in a bolted cover. <br />06 - Install Manhole Frame and Cover - Standard <br />A broken or damaged manhole frame can become an inflow source and a safety <br />hazard. This rehabilitation method addresses installation of a new frame and <br />cover on an existing manhole. <br />ADS Environmental Services, Inc. <br />VI-9 <br />
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