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V SAN JOAQUIN DSSTRSCT SAPLING PROTOCAL FOR ROUTINE TANK REMOVALS The following represents minimum sampling criterion required for closure compliance. Soil samples collected shall be representative of native soils beneath the tank's invert [tank's bottom] at a collection depth not be exceed 2 - 4 feet. If contamination is documented during closure, an Unauthorized Release notification must be filled out and submitted to SJLHD within 5 days. Section 2652, CCR. I WATER NOT PRESENT IN THE TANK PIT TANK SIZE MINIMUM NUMBER OF LOCATION OF SOIL SAMPLES LOCATION OF SOIL SAMPLES SOIL SAMPLES 10,000 GALLONS Less than 100 gallons ONE per tank Fill or pump end of tank OR LESS 1000 - 10,000 ga ons an tank ends at soil/ ne a ea 10,001 gallons and up THREE OR MORE Ends and Middle or ONE per tankgenerally spaced along interface the length of the tank Piping ONE EVERY 20 LINEAL FEET 10,000 GALLONS WATER IS PRESENT IN TANK PIT TANK SIZE MINIMUM NO. OF SOIL SAMPLES LOCATION OF SOIL SAMPLES MINIMUM NUMBER OF WATER SAMPLES 10,000 GALLONS From wall next to OR LESS tank ends at soil/ (Single Tank) TWO groundwater ONE interface GREATER THAN From wall next to ONE 10,000 GALLONS tank ends at soil/ OR groundwater TANK CLUSTER FOUR interface ,}LL efre ;2 1- '/' /N77J A19 j- RzErYL�bTH .f�i✓KC5> OTHER SPECIAL CONDITIONS SLAB PRESENT IN TANK PIT Soil samples shall be obtained beneath the slab within native soils. Penetration through the obstruction will be required in order to collect the samples. [Physical removal of the obstruction will then allow sampling according to the above conditions.] TANK SIZE MINIMUM NUMBER OF LOCATION OF SOIL SAMPLES SOIL SAMPLES Less than 1000 gallons THREE per tank Center and ends or sides 1000 - 10,000 gallons FIVE per tank Center and ends or sides 10,001 gallons and up FIVE OR MORE per Ends and Middle and tankgenerall y spaced along the length of the tank EH 23 047 12/88 REVISED 1/89