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Report of Concrete Slab Evaluation RE&A Project No. 2825-15-023-SE-A Existin�TKM Aviation Hangar June 27 2017 • Based on the information provided by representatives of TKM and CANCO, we understand that as part of site preparation, 4 to 5 inches of top soil were removed and 1 foot of compacted fill was added and was left to set for about 2 months before concrete was poured. , • Once the concrete was poured (approximately 1 year ago) for a 6-inch thick concrete slab, the expansion joints to a depth of little over 1 inch were saw-cut on the same da.y, and the slab was left to set for about 7 to 8 months. The exterior and interior slabs were pinned together. • Based on the information provided by A-1 Block Corporation, the concrete mix design used for the project, Mix ID 3057FNA, was designed to have slump range of 4 to 6 and strength of 3000 psi. I • Based on the information provided by Taylor Testing Laboratories, the 7-day and 28-day compressive strengths of the 3 sets collected during concrete placement were in the range � of 2,770 to 3,790 psi and 4,670 to 4,870 psi, respectively. ' • We also understand that the fmal construction at the site was completed earlier this year, and the epoxy coating was applied on the slab in February of 2017. • The residents moved in and sta.rted operations in March of 2017, which was when they started noticing the cracks through the epoxy. Summary of RE&A Field Explorations ' • In order to evaluate the concrete and soil conditions, RE&A performed a series of nine (9) concrete cores — six (6) cores of 6 inch diameter, and three (3) cores of 3 inch diameter— in the distressed areas on May 2nd and 4�, 2017. Four (4) of the 6-inch core locations were hand augered, supplemented with dynamic cone penetrometer (DCP) testing. Please refer to attached Test Location Plan (Sheet 1) in the Appendix for approximate test locations. 3 � ��