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SAMPLING PROTOCOL FOR ROUTINE TANK REMOVALS <br /> The following represents minimum sampling criterion required for closure compliance. Soil samples collected shall be representative of <br /> native soils beneath the tank's invert(tank's bottom)at a collection depth not to exceed 2-4 feet. If contamination is documented <br /> during closure,an Unauthorized Release Notification must be completed and submitted within five(5)working days pursuant to <br /> California Health&Safety Code,Section 25295. <br /> WATER NOT PRESENT IN THE TANK PIT <br /> TANK TANK SIZE MINIMUM NUMBER LOCATION OF SOIL SAMPLES <br /> # (Gallons) of SOIL SAMPLES <br /> < 1,000 1 perTank Fill OR Pump End of Tank <br /> 1,000-10,000 2 per Tank 1 at each End of Tank <br /> > 10,000 3 or More Ends and Middle OR generally <br /> per Tank spaced along the length of the Tank <br /> ,1 PIPING AND STOCKPILE <br /> PIPING SOIL SAMPLES 1 Sample every 20 lineal feet <br /> TANK& PIPING STOCKPILE SAMPLES 2 Samples every 50 cubic yards <br /> WATER IS PRESENT IN TANK PIT <br /> TANK TANK SIZE MINIMUM NUMBER of LOCATION of SOIL MINIMUM NUMBER of <br /> # (Gallons) SOIL SAMPLES SAMPLES WATER SAMPLES <br /> <10,000 2 from wall next to an <br /> Single Tank 3 ends at soil/groundwater 1 <br /> interface& 1 below tank <br /> 4 from wall next to tank <br /> > 10,000 OR 5 or more ends at soil/groundwater <br /> Tank Cluster interface&1 below each 1 <br /> tank <br /> SLAB PRESENT IN THE TANK PIT <br /> Soil samples shall be obtained beneath the slab within native soils. Penetration through the obstruction will be required in order to <br /> collect the samples. (Physical removal of the obstruction will allow sampling according to the above conditions.) <br /> TANK TANK SIZE MINIMUM NUMBER LOCATION of SOIL SAMPLES <br /> # (Gallons) of SOIL SAMPLES <br /> < 1,000 3 per Tank Center and Ends OR Sides of Tank <br /> 1,000-10,000 5 per Tank Center and Ends OR Sides of Tank <br /> > 10,000 5 OR More per Tank Ends and Middle and generally spaced <br /> along the length of the Tank <br /> Tri-Regional Recommendations <br /> Appendix A <br /> EH 23 046 (Revised 10/30/12) 6 <br />