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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 five (5) <br />working days pursuant to California Health & Safety Code, Section 25295. <br />DISPENSER PIPING AND STOCKPILE SAMPLES <br />TABLE #2 RECOMMENDED MINIMUM VERIFICATION ANALYSES <br />FOR <br />DISPENSER SAMPLES <br />1 Sample beneath each dispenser <br />STORAGE TANK INVESTIGATIONS <br />PIPING SOIL SAMPLES <br />1 Sample every 20 lineal feet <br />TPH-G <br />DISPENSER & PIPING STOCKPILE SAMPLES <br />2 Samples every 50 cubic yards <br />TABLE #2 RECOMMENDED MINIMUM VERIFICATION ANALYSES <br />FOR <br />UNDERGROUND <br />STORAGE TANK INVESTIGATIONS <br />TANK TANK <br />TPH-G <br />TPH-D <br />BTX & E CL HC TOTAL MTBE <br />OXYGENATES METALS PCB <br /># CONTENTS <br />LEAD8270 <br />(MTBE, TBA, DIPE, ICRP/AES <br />8015 <br />8015 <br />8020 8010 8020 <br />ETBE,TAME) or 8080 <br />8260 <br />8260 <br />8260 8240 7420 8260 <br />1,2 DCA & EDB <br />8260 7421 <br />AA <br />8260 <br />LEADED GAS <br />X <br />X <br />X <br />X <br />UNL GAS <br />X <br />X <br />X <br />DIESEL <br />X <br />X <br />KEROSENE <br />X <br />X <br />X <br />UNK FUEL <br />X <br />X <br />X <br />X <br />X <br />PROD. OIL <br />X <br />X <br />X <br />CHLOR. <br />SOLVENTS <br />X <br />X <br />X <br />NONCHLOR <br />SOLVENTS <br />X <br />X <br />X <br />WASTE\USED OIL <br />OR <br />UNKNOWN <br />X <br />X <br />X <br />X <br />X <br />X <br />X <br />CONTENTS <br />Notes: <br />1. EPA Method 8260B analyses must include all analytes listed in the method plus fuel oxygenates methyl - <br />tertiary -butyl ether (MTBE), diisopropyl ether (DIPE), ethyl -tertiary -butyl ether (EtBE), tertiary -amyl -methyl <br />ether (TAME), tertiary -butanol (TBA), methanol and ethanol and fuel additives 1,2-dichloroethane (1,2 -DCA) <br />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 <br />Method 8290 and pesticides by EPA Method 8081A. <br />3. METALS ICAP or AA Inductively Coupled Plasma Atomic Emission Spectrometry 6010 or Atomic Absorption <br />Spectrometry 7000. Metals: Cadmium, Chromium III and VI, Lead, Zinc and Nickel. <br />4. Non-proprietary, performance based analytical methods may be used with approval of Regional Board staff. <br />Revised 02/20/09 <br />4 <br />