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SAMPLING PROTOCOL 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 five(5)working days pursuant to California Health&Safety Code,Section 25295. WATER NOT PRESENT IN THE TANK PIT TANK TANK SIZE MINIMUM NUMBER LOCATION OF SOIL SAMPLES # (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 xPIPING SOIL SAMPLES 1 Sample eve 20 lineal feet TAN KK&PIPING STOCKPILE SAMPLES 2 Samples every 50 cubic yards WATER IS PRESENT IN TANK PIT TANK TANK SIZE MINIMUM NUMBER of LOCATION of SOIL MINIMUM NUMBER of # (Gallons) SOIL SAMPLES SAMPLES WATER SAMPLES < 10,000 2 from wall next to tank Single Tank 3 ends at soil/groundwater 1 interface&1 below tank 4 from wall next to tank > 10,000 OR ends at soil/groundwater Tank Cluster 5 or more interface&1 below each 1 tank SLAB PRESENT IN THE 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 # (Gallons) of SOIL SAMPLES < 1,000 3 perTank Center and Ends OR Sides of Tank 1,000- 10,000 5 perTank Center and Ends OR Sides of Tank I� > 10,000 5 OR More per Tank Ends and Middle and generally spaced 1UtcL� along the length of the Tank Tri-Regional Recommendations Appendix A EH 23 046 (Revised 10/30/12)