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November 2013 <br />MM # 1351 <br />SANITARY SEWER FEASIBILITY STUDY & REPORT <br />NORTH SEBASTIAN AREA <br />Study Area #2 <br />Study Area #2 is shown in Exhibit 2 with the existing sanitary sewer system shown in green and <br />the proposed gravity sewer system shown in red. Study Area #2 includes the residential <br />community of Ercildoune Heights and the area of Roseland, northwest of Roseland Road to the St. <br />Sebastian River shown on Exhibit 2. In order to develop the gravity sewer design of the sewer <br />systems to serve Study Area #2, Masteller & Moler, Inc. obtained spot elevations at key locations <br />to establish topography and obtained four (4) soil borings within Study Area #2 to reflect soil <br />conditions and the groundwater table elevations. <br />Ercildoune Heights is a residential community almost totally developed located along the east <br />shoreline of the St. Sebastian River. An existing gravity sanitary sewer system is located along the <br />east boundary of the community and serves numerous Ercildoune Heights users as well as some <br />commercial establishments along the west right-of-way of US #1. In addition, several users are <br />served by a small collection system and pumping station located at the extreme north end of 80th' <br />Avenue as shown on Exhibit 2. However, the majority of residences in Ercildoune Heights are <br />served by existing septic systems. <br />The balance of the residential users in Ercildoune Heights can be served by a gravity sewer <br />system at reasonable depths with the exception of three (3) properties on 142nd Way and eight (8) <br />properties on 141" Street. These properties are impacted by a deep ravine sloping from south to <br />north at a diagonal through the lots and covered by heavy vegetation and improvements. It <br />appears that a stormwater system exists to convey run-off to the St. Sebastian River but it is <br />questionable whether legal easements are provided for the stormwater system. Based on these <br />factors, the proposed gravity sewer design includes two (2) small pumping stations, similar to the <br />existing pumping station located at the northerly end of 80th Avenue, to serve the properties on <br />142nd Way and 141' Street. The proposed Ercildoune Heights gravity system connects to the <br />existing gravity sewer system in 140th Street. <br />The balance of Study Area #2 as shown on Exhibit 2 consists of two (2) areas of Roseland located <br />northwest of Roseland Road and extending to the St. Sebastian River. The area generally east of <br />the F.E.C. Railroad is almost totally developed with residential properties and streets laid out on a <br />grid -system. Exhibit 2 shows the gravity system design which will serve all of the existing users <br />and several undeveloped lots by gravity flow. The proposed gravity sewers connect to the existing <br />gravity sewer system in Kelso Place. <br />8 <br />