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125 <br /> CommunitySmall 1 1 Construction 1 <br /> ROW Costs: Gravity Sewer <br /> ROW equipment for gravity sewers consists of the following: <br /> • Large diameter mainline laid at a constant slope(see Figure 7) <br /> • Manholes <br /> • Lift stations(if required) <br /> • Air release valves(if required) <br /> Costs fluctuate based upon bedding material, location (rural versus urban),clearing costs,topography,geological conditions, depth,and surface <br /> restoration costs.Table 7 lists constructed costs for PVC gravity sewer pipe, excluding manholes, lift-stations,service wye's, and terminal clean- <br /> outs. It assumes ideal soil conditions, no dewatering,and an 8-ft(2.4-meter) mean burial depth. <br /> ! <br /> CM <br /> 6 <br /> CM ., X <br /> lL7 <br /> CID � 1 j �k <br /> � 1 JL CQ VJ <br /> t <br /> as 1 ti rq Tarvia f { <br /> 1 r L4 <br /> E Cinders <br /> W <br /> = Tarvia Cinders <br /> fes~ i~�i4.5�y� �`''�� rrr drain ,y1�'' <br /> �r+ <br /> �r <br /> �Lna�r ; 'e water- f si.i 1"Ci�s mer <br /> �� ~} <br /> 10"v.c.dral., 1 rrf f Nest of rr%yn <br /> 9 A"Gas 10"-12 j r r r �'k IMIders gt <br /> 35.86' � $[ ln ¢ r •1"Garr 'r 219.78 <br /> fAIMF 'have^' r Y Vl /$al6t6f r{ <br /> 4"V.cd J d 0L' J <br /> ¢s >; r rr r Y >rr f a rk } r r r <br /> Iva lz� A cmc <br /> ++ + + ++ + + +++ rf ++ ++ + f <br /> Ir+ <br /> + <br /> NN N N N N N <br /> M <br /> v aq r <br /> + + + + <br /> s ele . 5.0mm <br /> SasBa's'e eleIvI. 115I.00 I <br /> Ci <br /> 0 1 1 +35-86 3 +00.48 4 5 + 20.23 <br /> Figure 7.Profile of gravity sewer(Water Supply and Wastewater Removal,2011). <br /> Table 7.Installed Unit Costs:Gravity Sewer Pipe USD/Linear Ft(PVC)* <br /> Item Unit Cost per Unit,in 2008 USD <br /> 6-inch (150-mm) diameter mainline Linear ft(meter) $27($88) <br /> 8-inch (200-mm) diameter mainline Linear ft(meter) $30 ($98) <br /> 12-inch (300-mm) diameter mainline Linear ft(meter) $35($114) <br /> Table 16.3,Water Supply and Wastewater Removal,2011. <br /> Manholes are generally required at the end of each line,at all changes in grade,size,or alignment, at all intersections, and at distances not to <br /> exceed 400 ft(121 m)for sewers with diameters of 15 inches (375 mm) or less.9 With small gravity sewers, a minimum manhole diameter(bot- <br /> tom) of 4 ft(1.2 m) is widely accepted.Table 8 lists constructed costs for sanitary sewer manholes. <br /> ®2014 Orenco Systems®Inc. NFS-EFS-CC-1 <br /> Rev.1.6,©08/14 <br /> Page 7 of 13 <br />