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Mr. Vincent Burke, P.E July 27, 2020 Page 3 • Demolition and transportation for disposal of the 32 foot by 32 foot by 3 course high concrete block dike structure and 4 -inch thick concrete floor. It is assumed that the construction is identical to the plan provided in Appendix H of the Phase I ESA, competed by Tetra Tech in 2019. • Final rough grade with no additional restoration Table 1 Tank Contents Volume Notes A Diesel 10000 East Elevated in containment B Spray Oil 3000 West Elevated in containment P Waste Oil —500 Repurposed propane tank Note: This task will be completed on a fixed fee basis. It is assumed that the tanks are empty. Additional charges may apply for liquid disposal from the tanks and may be billed at a rate of $0.68 per gallon and $135 per hour plus 10% for the vacuum truck. Task 3 — AST Closure Assessment and Site Assessment Fixed Fee $10,339.97 The closure of the two regulated ASTs will require that a closure assessment be completed in accordance with Instructions for Conducting Sampling During Aboveground Storage Tank Closure, July 2019 Edition. This will be completed as the tanks are closed and the Diked area is demolished and will not require additional mobilization. The samples required for this subtask include: • Two samples each at two depth intervals in the diked tank area (4 samples) — Analysis: o BTEX and MTBE via USEPA Method 8260 o PAH via USEPA Method 8270 o TRPH via FLPRO o Organochlorine Pesticides via USEPA Method 8081B o Herbicides via USEPA Method 8151 o Arsenic via USEPA Method 6010 • It is assumed that samples will not be required in the waste oil AST area Site assessment activities required to delineate and/or confirm contaminants identified in the Phase II ESA include: AST Containment Area Tetra Tech recommended completing soil borings within 10 feet and on all four sides of soil samples AST -01 and AST -03 and collecting soil samples in each boring at the depth corresponding the highest photoionization detector (PID) reading (8 samples) with analysis for TRPH, PAHs, and BTEX. Additional borings are recommended for delineation if field screening above 10 ppm is detected in any boring, as described in Task 6 below. Once the soil delineation is complete additional recommendations will be required to address the groundwater impact identified in ATS-TMW-04. Tetra Tech also recommended completing one soil boring along each side of the AST containment area. A soil sample will be collected at the 2- to 3- foot and 4- to 5- foot depth interval from each boring. Each sample collected from the 2- to 3- foot interval will be analyzed for organochlorine pesticides, due to prior dieldrin detection in this area, and the 4- to 5- foot sample will be held for contingent organochlorine pesticides analysis to vertically delineate any identified impact (8 samples). Additional borings may be required to complete the delineation. Former AST Laydown Area Site assessment activities required to delineate and/or confirm contaminants identified in the Phase It ESA include the following subtasks: