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124 <br /> CommunitySmall Collection Construction Costs <br /> • Air release valves <br /> • Clean-outs <br /> • Pigging ports <br /> • Mainline isolation valves. Mainline material is generally polyvinyl chloride (PVC) or polyethylene (PE or HDPE),with pipe buried at shallow depths <br /> and with fewer joints compared to gravity sewers due to their increased individual pipe lengths. <br /> fi• <br /> . . . <br /> —1 J i—- -—----- <br /> Figure 6.Typical pressure sewer profile,following the contour of the land. <br /> Table 6, adapted from Water Supply and Wastewater Removal (2011), lists approximate costs for pressure sewer mains and appurtenances. <br /> Construction costs fluctuate due to(1) geological conditions, (2) burial depth, (3) pipe material, (4) groundwater depth,and (5)surface restoration <br /> requirements. <br /> Table 6.Installed Unit Costs:Pressure Sewer Mains(Effluent and Grinder)and Appurtenances.* <br /> Item Unit Cost per Unit, in 2008 USD <br /> 2-inch (50-mm) diameter mainline Linear ft(meter) $10.70($35.10) <br /> 3-inch (80-mm) diameter mainline Linear ft(meter) $11.40 ($37.40) <br /> 4-inch (100-mm) diameter mainline Linear ft(meter) $12.90 ($42.32) <br /> 6-inch (150-mm) diameter mainline Linear ft(meter) $18.00 ($59.05) <br /> 8-inch (200-mm) diameter mainline Linear ft(meter) $20.00($65.61) <br /> 2-inch (50-mm) diameter isolation valve Each $360 <br /> 3-inch (80-mm) diameter isolation valve Each $390 <br /> 4-inch (100-mm) diameter isolation valve Each $500 <br /> 6-inch (150-mm) diameter isolation valve Each $570 <br /> 8-inch (200-mm) diameter isolation valve Each $820 <br /> Automatic air release station Each $1,430 <br /> `Table 18.8,Water Supply and Wastewater Removal,2011. <br /> NFS-EFS-CC-1 m 2014 Orenco Systems®Inc. <br /> Rev.1.6,©08/14 <br /> Page 6 of 13 <br />