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FIGURE #1 — UNDERGROUND TANK INVESTIGATION PROCESS <br /> 2 JUNE 1988 <br /> Section I: Fuel Leak Indicators Section II: Routine Tank Removal.Investigation <br /> L 1 Itr vento Loss I.3 11.1 <br /> Nuisance Confirmed r Confirmed Failed 11. 1 Obvious Tank System 11.2 <br /> Conditions Tank Syst.Test Yes Failure: Hole or No <br /> Subchapter 16 per Subchap.16 Obvious Leak <br /> Identify the <br /> Source of Leak Obtain and Analyze Soil Samples <br /> (and Water Samples ii Ground Water Present <br /> Tank Removal Necessary? Yes in Tank Pit). See Tables 1 8 2. <br /> No <br /> Fuel Release Indicated Non-Fuel Release <br /> Abate Leak by Detectable No <br /> Concentrations? Indicated by <br /> =- Detectable Concentrations? <br /> F��i <br /> o FurtherSection 111: eson Required <br /> Soil!Ground Water Yes <br /> Investigation <br /> De'.ermine Depth to <br /> Seasonal High Ground Water CASE #1 j CASE #2 CASE #3 <br /> Section 111.1 Section 111.2 TPH or O& G greater than 100 TPH or O 8 G less than <br /> Depth to Seasonal Depth to Seasonal ppm for initial soil samples 100 Case by <br /> High Ground Water High Ground 1ha.er beneath the tank ppm for initial soil samples Case <br /> Less Than 50 Feet Greater Than 50 Feet beneath the tank Review <br /> OR AND <br /> Section 111.1.a Section 111.2.a Any detectable petroleum No detectable petroleum <br /> Determine the Extent Determine the Extent hydrocarbon residue found hydrocarbon residues found RWQCB <br /> of Soil Contamination of Soil Contamination at or below the seasonal high at or below the seasonal high <br /> See Table 2-MVAs See Table 2-MVAs ground water level g ground water level Lead Agency <br /> (regardless of the amount of (regardless of the amount of <br /> soil removed) soil removed) <br /> Section 111.1.b Section 111.2.b <br /> Install Monitoring Install Monitoring Well OR AND <br /> Well in Verified Down as Appropriate with <br /> Gradient Direction Regional Board Assist High permeability layers Low permeability soils <br /> in soil (silts and clays) <br /> Ground Water Impact? OR AND <br /> Ground water impacted Ground water not impacted <br /> Yes No <br /> Regional Board Lead,or Local Agency Lead No Further Action <br /> Local Agency with with Regional Board <br /> Regional Board Assist Assistance t. Required <br />