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Mr. Vincent Burke, P.E July 27, 2020 Page 5 Task 6 — Supplemental Site Assessment - Time and Materials not to Exceed $16,779.24 Tetra Tech will review the results of the closure assessment and site assessment activities outlined above. Based on the results of this assessment, additional soil and groundwater assessment maybe required. Until the results of the initial assessment are received, it is not clear what assessment will be required. The goal of the supplemental assessment will be to vertically and horizontally delineate the soil concentrations in exceedance of the FDEP Residential Direct Exposure Soil Cleanup Criteria and satisfy the FDEP Site Assessment Requirement outlined in F.A.C. 62-780. Groundwater in exceedance of FDEP GCTLs was identified in the Phase II ESA on the north side of the AST containment Area. Therefore, monitoring wells are anticipated to be required in this supplemental assessment. This task may include well drilling and drilling subcontractors, laboratory analysis and laboratory subcontractors, field equipment, travel, field personnel, and reporting. This task will be competed, as needed, on a time and materials basis not to exceed $16,779.24. Associated cost for supplemental investigations is dependent on findings generated by completion of Task 1 through 4, above. Task 7— Well permitting support — Time and Materials not to Exceed $2,940.70 Tetra Tech will assist IRCDUS with the transfer of permits and additional compliance assistance for the Community Water System well located south of the house and the five (5) artesian wells located on site. Tetra Tech understands that IRCDUS began this process. This task will be completed on a time and materials basis, as needed, not to exceed $2,940.70. PROJECT SCHEDULE The approximate duration noted for each task is based on our current understanding and best estimates of time required to perform the basic services and may be subject to change upon agreement between Indian River County and Tetra Tech. Task Timeline Notice to Proceed (NTP) August 20, 2020 AST registration submitted to FDEP September 1, 2020 AST Closure Notification submitted to FDEP October 1, 2020 AST Closure Competed January 1, 2020 Draft AST Closure report submitted to IRCDUS February 15, 2020 Final AST Closure report submitted to FDEP (assumes 7 calendar day IRCDUS review) March 1, 2021 Initial Site Assessment activities completed February 1, 2020 Draft Site Assessment Report submitted to IRCDUS March 15, 2021 Final Site Assessment Report submitted to FDEP (assumes 7 calendar day IRCDUS review) April 1, 2021 Supplemental Site Assessment TBD ASSUMPTIONS Tetra Tech's scope of services and project costs were developed with the following assumptions: • Tetra Tech will review available data provided by Indian River County. • Surveying services are not included. • Permitting fees are not included in this proposal TETRA TECH