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SAN .70AQUIN LOCAL HEALTH DISTRICT SAMPLING 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 Aust be filled out and submitted to SJLRD within 56ays. Section 2652, CCR. WATER NOT PRESENT IN THE TANK PIT TANK SIZE - MINIMUM NUMBER OF LOCATION OF SOIL SAMPLES SOIL SAMPLES Less than 1000 gallons ONE per tank Fill or pump end of tank 1000 - 10,000 gallons TWO per tank One at each end of tank 10,001 gallons and up THREE OR MORE Ends and Middle or per tank enerall spaced along ?he length of the tank Piping ONE EVERY 20 LINEAL FEET WATER IS PRESENT IN TANK PIT TANK SIZE MINIMUM NO. OF LOCATION OF SOIL MINIMUM NUMBER _ SOIL SAMPLES SAMPLES OF WATER SAMPLES 10,000 GALLONS — From wall next to OR LESS tank ends at soil/ (Single Tank) TWOgroundwater ONE Interface GREATER THAN From wall next to ONE 10,0000 GALLONS gtan ends soil/ TANK CLUSTER FOUR interface OTHER SPECIAL CONE)I T I ONS 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 tankgenerally spaced along the length of the tank EH 23 047 12/88 REVISED 1/89