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• • • • . • I • <br />The following represents minimum sampling criterion required for closure compliance. Soil samples collected shall be <br />representative of native soils beneath the tank's invert (tank's bottom) at a collection depth not to exceed 2 - 4 feet. If <br />contamination is documented during closure, an Unauthorized Release Notification must be completed and submitted within five (5) <br />working days pursuant to California Health & Safety Code, Section 25295. <br />r • i <br />Tri -Regional Recommendations <br />Appendix A <br />TABLE #2 RECOMMENDED MINIMUM VERIFICATION ANALYSES <br />FOR UNDERGROUND STORAGE TANK INVESTIGATIONS <br />DISPENSER SAMPLES <br />1 Sample beneath each dispenser <br />PIPING SOIL SAMPLES <br />1 Sample every 20 lineal feet <br />DISPENSER & PIPING STOCKPILE SAMPLES <br />2 Samples every 50 cubic yards <br />Tri -Regional Recommendations <br />Appendix A <br />TABLE #2 RECOMMENDED MINIMUM VERIFICATION ANALYSES <br />FOR UNDERGROUND STORAGE TANK INVESTIGATIONS <br />Notes: <br />1. EPA Method 8260B analyses must include all analytes listed in the method plus fuel oxygenates methyl -tertiary -butyl ether <br />(MTBE), diisopropyl ether (DIPE), ethyl -tertiary -butyl ether (EtBE), tertiary -amyl -methyl ether (TAME), tertiary -butanol (TBA), <br />methanol and ethanol and fuel additives 1,2-dichloroethane (1,2 -DCA) and ethylene dibromide (EDB or 1,2-dibromoethane). <br />2. If pentachlorophenol (PCP) is identified, analyze the soil and/or water sample for dioxins and furans by EPA Method 8290 <br />and pesticides by EPA Method 8081A. <br />3. Method 60108 may be used for all the following metals, for which individual AA methods are required: Antimony & Arsenic <br />by 7062, Cadmium by 7131A, Lead by 7421, Mercury by 7471A, Nickel by 7521, Selenium by 7742, and Thallium by 7841. <br />4. Non-proprietary, performance based analytical methods may be used with approval of Regional Board staff. <br />Revised 8/8/06 <br />Samples <br />Required <br />TarekSemi- <br />Contents <br />(Carbon <br />Gasoline <br />by 8015M <br />Diesel <br />by <br />BTEX <br />by <br />80216 <br />VOCs <br />by <br />82508 <br />VOCs <br />by <br />Oil & <br />Grease <br />PCBs <br />by <br />Total <br />Lead by <br />Title <br />22 <br />Metals <br />Range) <br />9) <br />or 82506 <br />8015M <br />or <br />(1) <br />8270C <br />by 1564A <br />8082 <br />7421 <br />(3) <br />82508 <br />Unknown (C4 -C36) <br />�O <br />O� <br />Gasoline (C4 -C20) <br />X <br />F <br />X <br />Diesel (C10 -C36) <br />�® <br />X <br />Jet FuC C20) <br />X <br />F7 <br />HeatinC Oil (Cl32) <br />J1 <br />�j <br />Stoddard Solvent <br />(Non( Chlorinated) <br />)❑❑❑❑�❑�❑ <br />ed <br />ChlorinatWaste <br />�0� <br />OUnknown <br />Oil or <br />Contents <br />Notes: <br />1. EPA Method 8260B analyses must include all analytes listed in the method plus fuel oxygenates methyl -tertiary -butyl ether <br />(MTBE), diisopropyl ether (DIPE), ethyl -tertiary -butyl ether (EtBE), tertiary -amyl -methyl ether (TAME), tertiary -butanol (TBA), <br />methanol and ethanol and fuel additives 1,2-dichloroethane (1,2 -DCA) and ethylene dibromide (EDB or 1,2-dibromoethane). <br />2. If pentachlorophenol (PCP) is identified, analyze the soil and/or water sample for dioxins and furans by EPA Method 8290 <br />and pesticides by EPA Method 8081A. <br />3. Method 60108 may be used for all the following metals, for which individual AA methods are required: Antimony & Arsenic <br />by 7062, Cadmium by 7131A, Lead by 7421, Mercury by 7471A, Nickel by 7521, Selenium by 7742, and Thallium by 7841. <br />4. Non-proprietary, performance based analytical methods may be used with approval of Regional Board staff. <br />Revised 8/8/06 <br />