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I SAN JO&N COUNTY PUBLIC HEALTH SERVICI SAMPLING FROTOCAL 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 WATER IS PRESENT IN TANK PIT TANK SIZE MINIMUM NUMBER of SOIL SAMPLES LOCATION of SOIL SAMPLE MINIMUM NUMBER of WATER SAMPLES LESS THAN 1,000 GALLONS ONE per tank Fill or pump end of tank From wall next to ESS THAN 1,000 GALLONS 1,000 - 10,000 GALLONS TWO per tank One at each end of tank tank ends at soil/ 1 ,001 GALLONS and UP THREE or MORE per tank Ends and Middle or generally spaced along the length of the tank TWO PIPING ONE per EVERY 20 LINEAL FEET WATER IS PRESENT IN TANK PIT 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.) 114 ANK SIZE MINIMUM NO. of SOIL SAMPLES LOCATION of SOIL SAMPLES MINIMUM NUMBER of WATER SAMPLES /10,000 GALLONS From wall next to ESS THAN 1,000 GALLONS THREE per tank or LESS tank ends at soil/ FIVE per tank Center and ends or sides (Single Tank) TWO groundwater ONE tank interface GREATER THAN the length of the tank 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.) 114 TANK SIZE MINIMUM NUMBER of LOCATION of SOIL SAMPLES SOIL SAMPLES ESS 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