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' lid dewater its contents clean the tank fracture the bottom and <br />' backfill the septic tank to grade with approved backfill sandy material. <br />Meanwhile, the existing 4 -inch service lateral from the house would be <br />extended to connect to a fiberglass pump basin which would be installed in <br />' the septic tank backfill material. The existing disposal field for each <br />home would be abandoned and a grinder pump installed in each basin would <br />' intermittently discharge the wastewater from each house into the manifolded <br />small force main system shown on Figure 8-1. In effect, the grinder <br />' pump/small force main system functions as a water supply system in reverse. <br />Instead of pressurized water being supplied by a main pipeline to each <br />' dwelling unit, pressurized wastewater is discharged from each dwelling unit <br />into a common main. <br />' Each of the 422 units in the Rockridge project service area would be <br />furnished with its own basin and grinder pump. When considering the layer <br />' of hard limestone and high ground water table factors, the grinder <br />pump/manifolded small force main system results in distinct and profound <br />' advantages since construction will be above the ground water table and <br />layer of hard limestone. In addition, the small manifolded PVC force mains <br />' have flexibility which allows them to be deflected around trees, shrubs, <br />sheds, and utility poles located within the existing backyard easement <br />' area. <br />The small 2- and 3 -inch diameter PVC force mains will primarily be <br />' constructed in a north -south direction and it is proposed that the force <br />mains connect directly into the existing 6 -inch PVC force main along 16th <br />' Street and directly into the 18 -inch existing force main along 18th Street. <br />' The grinder pump system is a proven system with a track record of <br />reliability provided that the system is properly designed and quality <br />pumping equipment is used in its construction. Once installed, the system <br />' should provide trouble-free operation and effectively solve the existing <br />sewage problems in the Rockridge area. <br />' IRC.VB4 <br />6/4/87 <br />' 8-4 <br />