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i I � I I I � I I I I I NUTTING t/C ENGINEERS OF FLORIDA, INC. ESTABLISHED 1967 May 1, 2007 Geotechnical & Construction Materials Engineering & Testing • Inspection Environmental Services Offices throughout the state of Florida www.nuttingengineers.com • info@ nuttingengineers.com Calvin, Giordano & Associates, Inc. 1800 Eller Drive, Suite # 600 Fort Lauderdale, Florida 33316 Attn: Mr. Ronnie S. Navarro, Engineer Engineering Department (Broward) Phone: 954 -921 -7781 e- mail: mavarro@calvin- giordano.com Subject: Reports of Exfiltration Tests Atlantic Isles Utility & Roadway Improvements City of Sunny Isles Beach, Florida Work Order No. 101.36 Dear YIr. Navarro: Nutting Engineers of Florida, Inc. has performed six exfiltration tests for the above referenced project. This report ' presents a brief description of the field procedures, and the results of the exfiltration test. Exfiltration tests were performed to a depth of twenty (20) feet below existing grade in accordance with South Florida ' Water Management District (SFNVivID) criteria for'Usual Open -Hole' conditions. Initially, it was proposed to perform the exfiltration tests to fifteen feet. However, due to the low permeability at this depth, it was decided to extend the depth of the test to twenty feet. Prior to starting the tests, a 6 -inch diameter hole was augered to the test depth to determine the depth to groundwater and to examine subgrade soils. After establishing they above parameters, the hole was stabilized by a full- length perforated PVC pipe in accordance with South Florida Water Management District specifications. Water was then pumped into the hole maintaining a constant water level at the around surface. The stabilized flow rates were recorded in one minute intervals for a total of 10 minutes. The exfiltration tests revealed the hydraulic conductivity ('K'- value) of the soils ranged from 3.85 X 10 -5 to 8.08 X 10 -5 cubic feet per second per square foot per foot of head. Soil descriptions and flow rates for the tests are shown on the attached exfiltration summary sheet. We note that the water table was encountered at depths in the range of approximately 2.0 to 3.5 feet below the existing around surface. We appreciate the opportunity to provide these services for you. Should you have any questions, or if we can be of Further assistance, please feel free to contact us. Respectfully Submitted: NUTTING ENGINEERS OF FLORIDA, INC. \iIt111a111111ad Irshad., E.I. B.N Project 1'Vlana,er r_'alvin (Jig rdan,,_:Adanucl'ulity & I Mld%%a]Y Intprokcment rGF Lcttcr 1 101 ;i, yII Richard Wohlfarth. P.E. 50858 Director o1. En,ineerin 8175 WEST 32"' AVENUE • SUITE 2 • HIALEAH, FLORIDA 33018 • (305) 557 -3083 • Fax (305) 824 -8827 Broward (954) 941 -8700 ^ Hillsborough (8 13) 866 -8800 - Palm Beach (561) 736 -4900