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PREPARED AARON J. BOWLES, P.E. AND STAFFED ENVIRONMENTAL ENGINEER BY DEPARTMENT OF UTILITIES gg SUBJECT: WATERMAIN INSTALLATION FOR 47TH, 48TH AND 49TH AVENLES BETWEEN 41ST STREET AND 43RD STREET BACKGROUND The Department of Environmental Health has identified a residence with excessive contaminated levels of trichloroethylene in their well water (see attached letter from M.J. Galanis, M.P.H. to affected residents dated November 27, 2001). The contaminated water was found at 4115 47th Avenue, in Gifford The identified organic compounds may have either originated from the old abandoned Gifford Landfill which was located on the south side of 41st Street, west of 43rd Avenue, or from one of the salvage yards located on the south side of 45th Street, west of 43rd Avenue. The Solid Waste Disposal District's continuing services consulting engineer, Geosyntech, has investigated the source of contamination emanating from the landfill as part of an evaluation of that site required by the Florida Department of Environmental Protection (FDEP). As per their report, dated January 2001, groundwater contamination has occurred primarily south of 41St Street, however contamination may spread to surrounding properties. Included in these properties are those residences to the north of 41St Street and south of 43`d Street, along 47th thru 49th Avenues. Evidence of this potential contamination has already been documented as per the above-mentioned 4115 47th Avenue address and those addresses listed in the attached memo from Glen Schuessler dated February 21, 2001. The Utilities Department, in conjunction with the Department of Health, feels it is necessary to extend a potable water supply system to the subject properties in the event contaminants are identified in the wells. Upon identification of contaminants reimbursement will be available from the FDEP under the Florida Water Supply Restoration Program. Scheduled monitoring of the surrounding properties is being performed and upon identification of individual contaminated wells, the Department of Utility Services will request funding from the FDEP for fees associated with connection of the subject residences. ANALYSIS 47th, 48th and 49th Avenues will have water mains extended to complete a looped system from 41c Street to 43`d Street. A 6" diameter water main will be extended 550 feet north along 47th Avenue from an existing 6" diameter water math located at 47th Avenue and 42"d Street. 1,245 feet of 6" diameter water main will be extended north on 49th Avenue from 41c Street to 43rd Street and then Looped back to 48th Avenue via 620 feet of 6" diameter water main along 43rd Street. A 6" water main exists on 48th Avenue from 41c Street to just south of 43rd Street. 47th and 48th Avenues will be looped via 510 feet of 6" diameter water math on 42nd Street. In all, a total of 2,925 feet of water main will be installed. FDEP will fiord line extension fees for water main extensions excluding fire hydrant costs. The estimated cost to extend the water maul as described above is $88,652.39 (see attached cost estimate). The construction cost will be recovered at an average rate of $14.29 per lineal foot. If all wells test positive for contamination and are eligible for funding, the County will be able to recoup $83,592.39, or 94.3% of the total cost. March 5, 2002 120 BKI2Ias 21 a„ 44,