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DocuSign Envelope ID:57852BDB-FD2B-4170-B5C8-435307C98954 <br /> SAN1 O 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(2) Grease Lead Metals(') <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 /> 1, 2, 3 (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 7471A,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 />