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<br />-: <br /> <br />. <br /> <br />. <br /> <br />. ''-'.'i~ <br />. "\ <br />,) <br /> <br />Table 4.2 <br />MAXIMUM DISTANCE BETWEEN <br />,', <br />SANITARY SEWER MANHOLES <br /> <br />PIPE DIAMETER IN iNCHES MANHOLE MAXIMUM'SPACING IN FEET <br />8-15 " 400 <br />18-39 ' ' 700 <br />>39 Per PE of record <br /> <br />c. <br />d." <br /> <br />Place,manholes at the dead-end of mains and laterals. <br />Existing manholes located within the city shall have the City of La <br />Porte'logo-on the manhole cover. Manhole covers shatl be cast iron, <br />, traft).c bearing type ring and cover. ' <br />, 'Criteria for COmlections to and Utilization ofManhQles <br /> <br />f.' <br /> <br />'.( 1) Connections between public sewers at' the' manhole sl!.all <br />adhere to the following criteria when possible ; <br /> <br />- (a) The. elevation of the flowline. of .the discharging <br />sewer Shall match the elevation of the flowline of the <br />receiving sewer whenever possible.' " <br />(b) Drop manholes are allowed. A dropcoIll!ection or <br />drop manhole is requiredw~en the difference in <br />, elevation between . the effluent flowline and the <br />ulfluent flowline is ~ater than 36 inches.. <br /> <br />(2)- <br /> <br />Public sewers shall not terminat~ in a clean-out. Clean-outs <br />may be utilized at the end of a service line. <br /> <br />i <br />l <br /> <br />g. Manholes should be located as to 'eUminate the inflow of storm water into <br />the sanitarY sewer.' The top ofmmlhole rim elevation shall be shown on the <br />plans for all ~anitary manhole, except in the .paved areas. Seated manholes <br />-. ar~ required, on all newly constructed manholes within the ~OO-year flood' <br />plain., - " <br />h.' ,Manholes shall be ~onstructed in accordance with the Standard Details. .All <br />manholes~shall include rubber seals preca.'1t into the manhole for pipe inserts <br />, .or 3M Scotch Seal 5600 and Oakum at all pipe connections (no Fosroc or, <br />cement); , 'PreC!lSt manholes, shall incorporate a boot-type connector for <br />sewer dia,meters up to 24 inches. For sewer diameters greater than 24 <br />inches, -utilize either the boot-type connector if available or an integral <br />, ga&ket. -: " <br />i. Steps mmanholes shall riot be allowed. <br />j. Allmanhole'adjustments shall be made with precast concrete rings when an <br />additional precast vertical section is too large., All manholes sh~ll be tested, . <br />. before:~c;~g ~ccept~d by the CitY of La Po~e for maintenance,. ' <br /> <br />L. Lift Stations <br /> <br />. . . . <br />1. Lift station design. and construction drawings as well as design requilements and <br />pertinent data shall be sealed by a Prt?fessional Engineer registered in the State <br />ofTex;iS and sublI!-itted with the <<onstruction'drawings for reView by the City. <br />2. Lift'Stations -~hould be considere4 only when a gravity ,system cannot be <br />achieved from both an engineering arid an e<;onomic standpoint., <br />"3. Lift station controls shall be enclosed and fenced in,such a way to prevent <br />unauthorize<;l ~'Peration,; vandalism and terrorism. <br /> <br />Sanitary Sewer Design Criteria Page ~ of 1~ <br />