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i <br />�j <br />septic tanks within the Rockridge section, all occurring within the last <br />five years. These complaints have been about septage backing up within <br />' septage systems in homes and in part overflowing into adjoining property. <br />The 1985 Area -Wide Wastewater Master Plan identified areas within Indian <br />River County that were experiencing septic tank system operational <br />' problems. Rockridge is located in an area experiencing operational <br />problems. <br />5 <br />Some residents of Rockridge have begun discharging their waste laundry <br />' water directly into surface water swales (a direct access to the shallow <br />aquifer). This practice has been used to relieve some of the sewage volume <br />' from the individual home to the already overly stressed septic tank system. <br />' <br />On March 25, 1987, ENVIRONMETRICS, a local environmental laboratory, HRS <br />ID #83214, took <br />four grab samples from canals in the study area. The <br />results of the samples shown in Table 3-3 indicate that there was no <br />serious health threat to the residents in the study area based on this <br />one-time sampling. The fecal coliform counts ranged from 2 to 56 per 100 <br />' <br />ml and the FC/FS ratio varied from 0.005 to 0.232 indicating predominantly <br />an animal waste source. <br />The <br />people of Rockridge are on the city water supply (no private drinking <br />' <br />water wells), whereby relieving a potential health threat due to the <br />potential contamination to the shallow potable source of water to the <br />people of the study area. Based on our experience with this type of <br />' <br />situation, it is possible that contaminated water will enter the shallow <br />aquifer at the site. <br />' <br />The City of Vero Beach has its well field (forroduction wells) ) 1 ocated a <br />considerable distance to the west of the study site. The wellfield is more <br />' <br />specifically located as far west as 43rd Avenue in the vicinity of the Vero <br />' <br />Beach Municipal Airport. Based on the distant location of this wellfield, <br />the <br />potential direct contamination to the City's well field from the <br />Rockridge septic systems is remote. <br />' IRC.VB4 <br />6/4/87 <br />