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SAN AQUIN COUNTY PUBLIC HEALTH SEI :ES 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 to exceed 2 - 4 feet. If contamination is documented during closure, an Unauthorized Release Notification must be completed and, submitted within 5 working days. California Health & Safety Code-Sec. 25295. WATER NOT PRESENT IN THE TANK PIT TANK SIZE MINIMUM NUMBER of LOCATION of SOIL SAMPLE SOIL SAMPLES LESS THAN 1,000 GALLONS ONE per tank Fill or pump end of tank 1,000 - 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 generally spaced along the length of the tank PIPING ONE per 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) TWO groundwater ONE interface GREATER THAN From wall next to 10,000 GALLONS FOUR tank ends at soil/ or groundwater ONE TANK CLUSTER interface 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 allow sampling according to the above conditions. ] TANK SIZE MINIMUM NUMBER of LOCATION of SOIL SAMPLES SOIL SAMPLES LESS THAN 1,000 GALLONS THREE per tank Center and ends or sides 1,000 - 10,000 GALLONS FIVE per tank Center and ends or sides 10,000 GALLONS and UP FIVE or MORE per Ends and Middle and tank generally spaced along the length of the tank EH 23 047 (Rev 2/8/91) ft Page 7