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1 <br />IAuthorization <br />' The Rockridge area sewer feasibility study and report has been <br />authorized by Indian River County work authorization #3, dated February <br />' 12, 1986. <br />' <br />General Information <br />The Rockridge area of Indian River County is located east of 6th <br />' <br />Avenue and south of 17th Street. A small portion of the project area <br />lies north of 17th Street. The project area is within 2000 feet of <br />' <br />the Indian River and in close proximity to the Vero Beach wastewater <br />treatment plant. <br />The Rockridge area is aptly named. A soil boring program, performed <br />as part of this report, has verified that the entire project area is <br />located over a layer of hard limestone containing fractures and solution <br />' <br />holes. The entire soils report, performed by Empire Engineering & <br />Testing, Inc. and dated March 24, 1986, is contained in the appendix <br />of this study and report. The soils report shows that the hard limestone <br />' <br />layer starts from 1 to 2 feet below the ground surface and is 1 to <br />feet thick in the portion of the project area south of 17th Street. <br />2 <br />Soil boring (B-6) was taken in the project area north of 17th Street <br />and shows that the hard limestone starts at 4 feet below the ground <br />' <br />surface and is approximately ld feet thick. The soil borirgs also <br />show that ground water is present at 3 to 4 feet below the ground surface <br />' <br />throughout the project area. The presence of the hard limestone layer <br />and the high ground water table are conditions which prohibit an easy <br />and inexpensive method to treat and dispose of domestic wastewater <br />from the homes in the Rockridge area. <br />The Rockridge area of Indian River County is a single family lot <br />' <br />subdivision generally consisting of single story, masonry dwelling <br />units on building lots 57 feet wide by 97 feet deep. The project service <br />' <br />area is shown on the various exhibits included in this report and contains <br />approximately 375 dwelling units. Each of the 375 dwelling units is <br />served by the Indian River County utility Department water supply system. <br />' <br />1 <br />The water lines are, generally, fairly small in diameter and are installed <br />