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Inflow Inserts £or Manholes <br />Where the CONTRACTOR provides other than Parnrex ring and covers, the insert shall be a <br />"Rain Sentry" watertight inflow insert, as manufactured by Irnproved Construction Methods, <br />Inc., Jacksonville, Arkansas; or "RainGuard", by LF Manufacturing, Giddings, Texas; complete <br />with 1 psi relief valve, nylon strap handle, and closed cell neoprene gasket. Relief valve shall not <br />have a water leak down rate in excess of 5 gpd. <br />Manhole Realacement <br />Where it is indicated on construction drawings "REPLACEMENT MANHOLE", the <br />GONTRACTOR shall remove and replace existing manholes with new concrete manholes <br />meeting the technical specification for "Manholes" and "Manhole Removal" elsewhere herein. <br />The CONTRACTOR shall maintain sewage flow during construction of the new manhole. Two <br />possible ways of accomplishing this are described herein. CONTR.ACTOR may propose <br />alternate methods for approval by the ENGINEER. First option would be to install a temporary <br />piping arrangement similar to "Temporary Piping Around Replacernent Manhole During <br />Construction" construction detail. The second option would be to pump around the manhole <br />under construction. This would require locating each upstream manhole for each sewer line <br />flowing into the manhole under construction, plugging each line out of each upstream manhole <br />to prevent sewage flow out of rnanholes and then installing portable pump at each upstream <br />manhole, capable of pumping sewage flows entering manhole, in a temporazy discharge line to <br />first manhole downstream of manhole under construction. If the second option is used, the <br />CONTRACTOR shall provide full time personnel monitoring the various pumps and piping to <br />ensure all are operating properly, and discharge hoses shall not obstruct traffic. <br />Whichever option is chosen to maintain sewage flow, the CONTRACTOR is solely responsible <br />for the installation, operating, maintenance and removal of any and all pieces of equipment, <br />materials or products used. Furthermore, the CONTRACTOR shall, at no time, allow the flow of <br />sewage from new or existing manholes and existing or temporary piping to be discharged into or <br />onto any structure or surface which has not been installed for the specific purpose of carrying <br />sewage flows. Such illegal discharge would be grounds for withholding payment. <br />Manhole Vacuum Testin <br />All replacement manholes shali be vacuum tested by the CONTRACTOR in the presence of the <br />OWNER'S representative for sources of infiltration. <br />1. Manholes shall be tested with all connections (existing and/or proposed) in place. <br />2. Drop-connections and ring castings sealing connections shall be installed prior to testing. <br />3. All lift holes and exterior joints shall be plugged with an approved non-shrink grout. <br />However, no horizontal joints shall be plugged prior to testing. <br />94 <br />