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L A. M. ENGINEERING AND TESTING, INC. Geotechnical Exploration for Proposed Restrooms and Boardwalk Wabasso Beach Park, Indian River County, Florida Project No. PSLI935B- 1 FOUNDATION RECOMMENDATIONS — RESTROOM STRUCTURES Based on sheet A4. 10 prepared by Donadio & Associates, Architects P.A. (dated September 13 , 2007 for DEP Permit), the restrooms will be supported on 16 inch diameter augercast piles with a pile top elevation (bottom of lowest structural member) of + 16 feet NGVD, minimum pile tip elevation of 49 feet NGVD, and a design scour elevation of +3 feet NGVD . The restrooms will have a finished floor elevation of + 18 feet NGVD . Since the 100-year storm erosion elevation is at +3 . 0 NGVD, a loss of soil support in the upper 13 feet was included in compressive, tensile, and lateral pile capacity analyses. Sixteen inch diameter augercast piles installed with a minimum tip elevation of - 19 feet NGVD may be designed for a maximum 25 ton allowable compressive capacity and 15 ton uplift capacity. Lateral loads can be transmitted to the vertical piles up to the values shown on Table 1 . We assume that the piles will have a minimum of one percent steel reinforcement for the calculations. The lateral capacity, pile top deflection, maximum moment, and point of fixity were calculated using the commercially available L-pile 4. 0 software assuming a free-head condition. Additional lateral capacity may be attained by utilizing inclined piles. Table 1 : Lateral Capacities for 16-inch Diameter Augereast Piles Lo Pile Pile Top Design Lateral Estimated Maximum Elevation Elevation Diameter Elevation Minimum Load Deflection Moment of Max of Point Pile Tip At Top of Moment of Fixity Elevation Pile (inches) (NGVD) (tons) (inches) (in4dps) (NGVD) (NGVD) (NGVD) 16 1 + 15 1 - 19 I 0. 8 1 14 1 275 1 +0 1 - 13 The pile tips should be socketed at least two feet into dense soil. The piles should be installed with minimum center-to-center spacings of at least 3 times the pile diameter, D . For structures east of the CCCL, pile center-to-center spacings of 8D might be required. Augercast piles should be reinforced over their entire length for tension capacity. The reinforcement shall be as designed by the Structural Engineer. Centralizers should be installed at the toe of the pile, and at a minimum vertical spacing of 15 feet along the cage. We recommend a minimum grout strength of 5 ,000 psi at 28 days. The type of specimens (2-inch cubes or 3 x ' 6 cylinders) used for compressive strength testing shall be the type used for mix design. The frequency of molding specimens shall be at least one (1 ) set of six (6) compressive strength specimens per day, but not less than one ( 1 ) set for every 50 cubic yards placed in a day. The grout may be held in the mixer for a period not to exceed 120 minutes unless approved by the Geotechnical Engineer's representative in the field. 3