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SAMPUNO PROTOCOL FOR ROUTINE TANK REMOVALS The following represents minimum sampling criterion required for closure compliance. Soil sample 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. It contamination Is documented during closure, an Unauthorized Release Notification must be completed and submitted within five (S) working days pursuant to California Health do Safety Code, Section 23293. WATER NOT PRESENT IN THE TANK PIT TANKj TANK SIZE MINIMUM NUMBER LOCATION OP SOIL SAMPLES N (Gallons) of SOIL SAMPLES < 1,000 1 per Tank Fill OR Pump End of Tank 1,000 - 10,000 2 per Tank 1 at each End of Tank > 10,000 3 or More Ends and Middle OR generally per Tank spaced along the length of the Tank PIPING AND STOCKPILE PIPING SOIL SAMPLES 1 Sample every 20 lineal feet TANK A PIPING STOCKPILE SAMPLES 2 Samples every 50 cubic yards WATER IS PRESENT IN TANK PTT TANK TANK SIZE MINIMUM NUMBER LOCATION of SOIL MINIMUM NUMBER of M (Gallons) of SOIL SAMPLES SAMPLES WATER SAMPLES < 10,000From wall next to tank Single Tank 2 ends at soil/groundwater t From > 10,000 OR From wall next to tank Iq Tank Cluster 4 ends at soil/ 1 groundwater Interface SLAB PRESENT IN TAE 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 TANK SIZE MINIMUM NUMBER LOCATION of SOIL SAMPLES N (Gallons) of SOIL, SAMPLES < 1.000 3 per Tank Center and Ends OR Sides of Tank 1,000 • 10,000 S per Tank Center and Enda OR Sides of Tank > 10,000 3 OR More per Tank Ends and Middle and generally spaced along it the length of the Tank FII 23 046 (Revised 9/11/96) Page 7