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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 live (5) <br />working days pursuant to California Health & Safety Code, Section 25295. <br />DISPENSER PIPING AND STOCKPILE SAMPLES <br />DISPENSER SAMPLES 1 Sample beneath each dispenser <br />PIPING SOIL SAMPLES 1 Sample every 20 lineal feet <br />DISPENSER & PIPING STOCKPILE SAMPLES 2 Samples every 50 cubic yards <br />Tri -Regional Recommendations <br />Appendix <br />TABL <br />MMENDED MINIMUM VERIFICATION ANALYSES <br />•r UNDERGROUND I • i _INVES71GATIONS <br />Tank Gasoline Diesel BTEX VOCs <br />Tank <br />Semi- <br />title <br />Samples Contents <br />by <br />by <br />oil & <br />PCBs <br />Total <br />22 <br />Required (Carbon <br />by 8015M <br />by <br />8021B <br />82608 <br />by <br />urease <br />by <br />Lead by <br />Metals <br />or 82608 <br />8015M <br />or <br />(1) <br />82700 <br />by 1664A <br />8082 <br />7421 <br />(3) <br />Range) <br />(2) <br />82608 <br />Unknown Fuel <br />X <br />X <br />X <br />X <br />C4 -C36 <br />X <br />X <br />Gasoline (C4 -C20) <br />X <br />Diesel (C10 -C36) <br />X <br />X <br />X <br />Jet Fuel/Kerosene <br />X <br />X <br />C9 -C20 <br />Heating Oil (C10- <br />X <br />X <br />C32 <br />Stoddard Solvent <br />(C8 -C20) <br />X <br />X <br />Non - Chlorinated <br />Chlorinated <br />X <br />X <br />Solvents <br />Waste Oil or <br />X <br />X <br />X <br />X <br />X <br />X <br />X <br />Unknown Contents <br />Notes: <br />1. EPA Method 82608 analyses must include all analytes listed in the method plus fuel oxygenates methyl -tertiary -butyl ether <br />(MTBE), diisopropyl ether (DIPS), 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 (PCR) is identified, analyze the soil andfor 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 7131 A, Lead by 7421, Mercury by 7471 A, 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 818/06 <br />3 <br />