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SAN10 A Q U I N Environmental Health Department <br /> . COUNTY <br /> SAMPLING PROTOCOL FOR ROUTINE PIPING / DISPENSER REMOVAL/ REPLACEMENT <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. <br /> Samples cannot be combined into a composite sample for analysis in the field or the lab . Each sample must <br /> have a set of corresponding analytical results . If contamination is documented during closure , an Unauthorized <br /> Release Notification must be completed and submitted within five ( 5) working days pursuant to California Health & <br /> 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 /> TABLE #2 RECOMMENDED MINIMUM VERIFICATION ANALYSES <br /> FOR UNDERGROUND STORAGE TANK INVESTIGATIONS <br /> TANK TANK Gasoline Diesel BTEX VOCO ) Semi - oil & PCB Total Title 22 <br /> # CONTENTS VOCs(z) Grease Lead Metals(3) <br /> 8015M 8021B 8260B 8082 7421 <br /> 8260B 8015M 8260B 8270C 1664A <br /> Unknown Fuel <br /> (C4-C36) X X X X <br /> Gasoline <br /> (C4-C20) X X X <br /> Diesel <br /> (C10—C36) X X X <br /> Jet Fuel/Kerosene <br /> (C9-C20) X X <br /> Heating Oil <br /> (C10-C32) X X <br /> Stoddard Solvent <br /> (non-chlorinated) X X <br /> C8-C20 <br /> Chlorinated <br /> Solvents X X <br /> Waste Oil or <br /> Unknown Contents X X X X X X X <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 <br /> (TBA) , methanol and ethanol and fuel additives 1 , 2-dichloroethane (1 , 2-DCA) and ethylene dibromide (EDB or 1 , 2- <br /> 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 . Title 22 Metals : Method 60108 may be used for all but the following metals , for which individual AA methods are required : <br /> Antimony & Arsenic by 7062 , Cadmium by 7131A, Lead by 7421 , Mercury by 7471 A, Nickel by 7521 , Selenium by 7742 , and <br /> Thallium by 7841 . <br /> 4 . Non-proprietary, performance based analytical methods may be used with approval of Regional Board staff. <br /> 5 of 6 <br />