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The following represents minimum sampling criterion required for closure compliance. Soil samples collected shall be representative of native soils beneath the tank's invert (tank's bottom) at a collection depth not to exceed 2 - 4 feet. If contamination is documented during closure, an Unauthorized Release Notification must be completed and submitted within five (5) working days pursuant to California Health & Safety Code, Section 25295. DISPENSER PIPING AND STOCKPILE SAMPLES Tri -Regional Recommendations Appendix A TABLE #2 RECOMMENDED MINIMUM VERIFICATION ANALYSES FOR UNDERGROUND STORAGE TANK INVESTIGATIONS Tanksemi- BTEX VOCs Title Gasoline Diesel by by VOCs Oil & PCBs Total 22 Required Metals 80218 82608 Samples Contents by 8015M by by Grease by Lead by Carbon ( a or 82608 8015M or (1) 8 (2;C by 1664A 8082 7421 (3) Range) � 82608 Unknown Fuel X X X X C4 -C36 Gasoline (C4 -C20) X X X Diesel (C10 -C36) X X X Jet Fuel/Kerosene X X C9 -C20 HeatinC O2) X Stoddard Solvent (C8 -C20) X X a Non -Chlorinated Chlorinated X X Solvents Waste Oil or X X X X X X X Unknown Contents Notes: 1. EPA Method 8260B analyses must include all analytes listed in the method plus fuel oxygenates methyl -tertiary -butyl ether (MTBE), diisopropyl ether (DIPE), ethyl -tertiary -butyl ether (EtBE), tertiary -amyl -methyl ether (TAME), tertiary -butanol (TBA), methanol and ethanol and fuel additives 1,2-dichloroethane (1,2 -DCA) and ethylene dibromide (EDB or 1,2-dibromoethane). 2. If pentachlorophenol (PCP) is identified, analyze the soil and/or water sample for dioxins and furans by EPA Method 8290 and pesticides by EPA Method 8081A. 3. Method 6010B may be used for all the following metals, for which individual AA methods are required: Antimony & Arsenic by 7062, Cadmium by 7131A, Lead by 7421, Mercury by 7471A, Nickel by 7521, Selenium by 7742, and Thallium by 7841. 4. Non-proprietary, performance based analytical methods may be used with approval of Regional Board staff. Revised 8/3/07 3 DISPENSER SAMPLES 1 Sample beneath each dispenser PIPING SOIL SAMPLES 1 Sample every 20 lineal feet DISPENSER & PIPING STOCKPILE SAMPLES 2 Samples every 50 cubic yards Tri -Regional Recommendations Appendix A TABLE #2 RECOMMENDED MINIMUM VERIFICATION ANALYSES FOR UNDERGROUND STORAGE TANK INVESTIGATIONS Tanksemi- BTEX VOCs Title Gasoline Diesel by by VOCs Oil & PCBs Total 22 Required Metals 80218 82608 Samples Contents by 8015M by by Grease by Lead by Carbon ( a or 82608 8015M or (1) 8 (2;C by 1664A 8082 7421 (3) Range) � 82608 Unknown Fuel X X X X C4 -C36 Gasoline (C4 -C20) X X X Diesel (C10 -C36) X X X Jet Fuel/Kerosene X X C9 -C20 HeatinC O2) X Stoddard Solvent (C8 -C20) X X a Non -Chlorinated Chlorinated X X Solvents Waste Oil or X X X X X X X Unknown Contents Notes: 1. EPA Method 8260B analyses must include all analytes listed in the method plus fuel oxygenates methyl -tertiary -butyl ether (MTBE), diisopropyl ether (DIPE), ethyl -tertiary -butyl ether (EtBE), tertiary -amyl -methyl ether (TAME), tertiary -butanol (TBA), methanol and ethanol and fuel additives 1,2-dichloroethane (1,2 -DCA) and ethylene dibromide (EDB or 1,2-dibromoethane). 2. If pentachlorophenol (PCP) is identified, analyze the soil and/or water sample for dioxins and furans by EPA Method 8290 and pesticides by EPA Method 8081A. 3. Method 6010B may be used for all the following metals, for which individual AA methods are required: Antimony & Arsenic by 7062, Cadmium by 7131A, Lead by 7421, Mercury by 7471A, Nickel by 7521, Selenium by 7742, and Thallium by 7841. 4. Non-proprietary, performance based analytical methods may be used with approval of Regional Board staff. Revised 8/3/07 3