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139" Street SW Bridge at 58th Avenue -7- File No. 07-5535 QUALITY ASSURANCE We recommend establishing a comprehensive quality assurance program to verify that all site preparation and foundation and pavement construction is conducted in accordance with the appropriate plans and specifications. Materials testing and inspection services should be provided by Ardaman & Associates, Inc. As a minimum, an on-site engineering technician should monitor all stripping and grubbing to verify that all deleterious materials have been removed and should observe the proof -rolling and proof - compacting operations to verify that the appropriate number of passes are applied to the subgrade. In-situ density tests should be conducted during filling activities and below all foundation and pavement areas to verify that the required densities have been achieved. In-situ density values should be compared to laboratory Proctor moisture -density results for each of the different natural and fill soils encountered. Foundation Toad testing and installation of driven piles should be monitored continuously by Ardaman & Associates, Inc. Finally, we recommend inspecting and testing the construction materials for the foundations and other structural components. CLOSURE The analyses and recommendations submitted herein are based on the data obtained from the soil borings presented in Appendix 11. This report does not reflect any variations which may occur adjacent to or between the borings. The nature and extent of the variations between the borings may not become evident until during construction. If variations then appear evident, it will be necessary to re-evaluate the recommendations presented in this report after performing on-site observations during the construction period and noting the characteristics of the variations. This study does not include an evaluation of the environmental (ecological or hazardous/toxic material related) condition of the site and subsurface. This report has been prepared for the exclusive use of Indian River County and its representatives in accordance with generally accepted soil and foundation engineering practices. In the event any changes occur in the design, nature or location of the proposed bridge system, we should review the applicability of conclusions and recommendations in this report. We recommend a general review of final design and specifications by our office to verify that earthwork and foundation recommendations are properly interpreted and implemented in the design specifications. Ardaman and Associates should attend the pre-bid and preconstruction meetings to verify that the bidders/contractor understand the recommendations contained in this report.