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Mr. Vincent Burke, P.E July 27, 2020 Page 4 • Supplemental Assessment o Tetra Tech recommends additional sampling at the former AST locations with samples collected in the tank laydown area at two depth intervals (6 samples) for the following Analysis: ■ BTEX and MTBE via USEPA Method 8260 • PAH via USEPA Method 8270 ■ TRPH via FLPRO ■ Arsenic via USEPA Method 6010 • Organochlorine pesticides via USEPA Method 8081B o Arsenic in the Tank Laydown area - Soil arsenic concentrations in exceedance of the Industrial Direct Exposure SCTL are present in the Tank Laydown Area. The sample analyzed was a subsurface composite sample; therefore, the location of the impact is not known. Additional assessment is required to delineate the arsenic impact in this area, and will include 6 borings around the perimeter of the former AST Laydown area with the following analysis: ■ Arsenic via USEPA Method 6010 Additional delineation may be required following this sampling and is addressed in Task 7. All assessment activities will be completed under the supervision of a Florida Professional Geologist, in accordance with state requirements. This task will be completed on a fixed fee basis. Task 4 — Closure Reporting - Fixed Fee $3,615.18 A summary report of the activities conducted to close the ASTs will be completed. The report will outline the details of the tank closure, sampling, and disposal, and will include all manifests and a photo log of the site activities. Sampling and analysis specific to the closure of the regulated ASTs will be included. Additional sampling and analytical results will be provided in the Site Assessment Report. This report will be signed and sealed by a Professional Geologist. This task will be completed on a fixed fee basis. Task 5 — Site Assessment Report - Fixed Fee $4,580.79 A separate Site Assessment Report will also be prepared to provide the details of all findings of the soil delineation, and include the following sections: • Executive Summary • Introduction, Scope of Services, and Limitations • Background • Geology and Hydrogeology • Contamination Assessment • Results and Discussion • Conclusion and Recommendations • Figures • Appendices (i.e., field data sheets, laboratory analytical reports, etc.) This report will also include the results of the Phase II ESA and will be signed and sealed by a Professional Geologist. This task will be completed on a fixed fee basis. ri4rt_rlix+P.l