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MMBV ENGINEERING, INC. f'n1A BOWLES VILLAMIZAR&ASSOCIATES i v.mbveng.com cA93728 f December 30, 2012 I I Mr. Himanshu Mehta,P.E. { Managing Director Indian River County Solid Waste Disposal District 1325 74"' Ave. SW Vero Beach, FL 32968' Subject: Indian:River County SWDD Customer Convenience Centers Gifford CCC—Pavement Repair Recommendation Indian River County, Florida l Engineer's Project Number: 12-156 Dear Mr.Mehta: Please find this letter as our recommendation for the Gifford CCC pavement repair due to the underlying moisture issue that is prevalent at the aforementioned Customer Convenience Center. Upon review of the soils investigation by KSM. Engineering for the (3) core boring locations taken within the pavement failure areas, and through discussions with County staff that this site was once utilized as a landfill, it is our understanding that there may be pockets of moisture deeper under the base and sub-base materials that contributed to the isolated failures of the newly placed asphalt. Since this problem could not have been foreseen, and upon our latest findings and soils data, it is our: recommendation that the contractor install a revised pavement section removing an additional 7" of existing base material (10" in total) and replace it with 10" of limerock or coquina, compacted to the recommendations by the soils firm, then overlaid with 2" of SP 12.5 asphalt. This repair detail will provide a "bridge" between the existing subsurface material and the asphalt. As the proposed remediation is outside the original contractor's scope of work, we recommend that additional services in the amount of $12,500 (see attached Exhibit A) be authorized to Mancil's 'Tractor Services, Inc. for completion of this effort. Please note that the original contract amount of$141,892.50 for the (3) Centers did not include a contingency. This was due to the fact that this project was not originally in the County's budget and was undertaken with emergency funds. In order to be mindful of this situation and good stewards of our tax dollars, the 10% contingency commonly used for situations like this was not requested in the original contract amount. The new contract amount, should the additional finds be approved, will be $154,392.50, an 8.8% increase, but still under the normal 10% contingency threshold commonly utilized for projects. Therefore, pursuant to the above summary and recent findings, we hereby recommend $12,500 of additional construction fluids be approved to Mancil's Tractor Services, Inc. for the final remediation activities for the above referenced Customer Convenience Center. 1835 20th Street 1600 W Eau Gallie Blvd,Suite 203 806 Delaware Avenue Vero Beach,FL 32960 Melbourne,FL 32935 Ft.Pierce,FL 34950 772,569.0035 321253,1510 772.468.9055 Fax:772.7783617 Fax:321.253.091 1 Fax:772.778.3617 136