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November 2013 <br />MM 1351 <br />SANITARY SEWER FEASIBILITY STUDY & REPORT <br />NORTH SEBASTIAN AREA <br />periodically emptied by the homeowner. To implement the system, the existing septic disposal <br />element is abandoned and the septic tank discharge is redirected into the STEP pump station. <br />The STEP system pumps are Tess expensive than the grinder pumps but the STEP system <br />requires the retention of the septic tank and its maintenance expense. Otherwise, the grinder <br />pumps system and STEP system are very similar with regard to the design of the force main <br />system and construction considerations. <br />Study Area #1 <br />Study Area #1 using the low pressure collection system with grinder pump or STEP system <br />stations is shown on Exhibits 5A and 5B. The existing sanitary sewer is shown in green and the <br />proposed 2 -inch and 3 -inch force main systems are shown in blue and orange, respectively. <br />Study Area #1 has a north / south sand ridge along the east side of US #1. The result is the <br />commercial users along the east side of US#1 must be served by a separate sewer system. <br />Based on meetings with representatives of the F.D.O.T. concerning the location of a sewer system <br />In the US #1 right-of-way, it was the position of the F.D.O.T. staff that no structures would be <br />approved within the US #1 right-of-way, but sewer pipe and manholes would be permitted. Also, <br />the existence of numerous large commercial users and several Targe parcels of undeveloped land <br />create wastewater flows which are too large for a low pressure sewer system to handle in <br />connection with a small force main system. Therefore, Exhibits 5A and 5B show conventional <br />gravity sewer being proposed for serving the commercial users along the east side of US #1. <br />The portion of Study Area #1 where the low pressure sewer system alternative should be given <br />serious consideration is the North Central Avenue corridor from Roseland Road south to the <br />intersection of North Central Avenue and US #1 and a small area north of Roseland Road <br />consisting of residences along Ruffner Lane and users along Bay Street. Since the groundwater <br />table is high along North Central Avenue, the shallow depth of the small force main system will <br />result in a substantial reduction in the cost of construction of the pipelines and associated <br />dewatering expenses. Also, the sealed force main pipeline system associated with the low <br />pressure system alternative will result In the elimination of infiltration which reduces future <br />operation and maintenance expense. <br />Study Area #2 <br />Study Area #2 showing the layout design using a low pressure sewer system with grinder pump or <br />STEP system stations is shown on Exhibit 6. The existing sanitary sewer is shown in green and <br />16 <br />