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f SAMPLING &TOCOL FOR ROUTINE TANK R VALS <br /> The following represents minimum sampling criterion required for closure compliance. Soil samples collected shall be <br /> representative of native soils beneath the tank's invert(tank's bottom)at a collection depth not to exceed 2-4 feet. If <br /> contamination is documented during closure,an Unauthorized Release Notification must be completed and submitted within five <br /> (5)working days pursuant to California Health&Safety Code,Section 25295. <br /> WATER MaX PRESENT IN THE TANK PIT <br /> TANK TANK SIZE MINIMUM NUMBER LOCATION OF SOIL SAMPLES <br /> # Gallons of SOIL SAMPLES <br /> 830- < 1,000 1 per Tank Fill OR Pump End of Tank <br /> D1U1 <br /> 1000- 10,000 2 ver Tank 1 at each End of Tank <br /> > 10,000 3 or More per Tank Ends and Middle OR generally <br /> svaced along the length of the Tank <br /> PIPING AND STOCKPILE <br /> 1 PIPING SOIL SAMPLES I 1 Sample every 20 lineal feet <br /> l TANK& PIPING STOCKPILE SAMPLES 1 2 Sam les eve 50 cubic yards <br /> WATER IS PRESENT IN TANK PIT <br /> TANK TANK SIZE MINIMUM LOCATION of SOIL MR41MUM NUMBER of <br /> # (Gallons) NUMBER of SOIL SAMPLES WATER SAMPLES <br /> SAMPLES <br /> < 10,000 From wall next to tank <br /> Single Tank 2 ends at soil/groundwater 1 <br /> interface <br /> > 10,000 OR From wall next to tank <br /> Tank Cluster 4 ends at soil/groundwater 1 <br /> interface <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 <br /> order to collect the samples. (Physical removal of the obstruction will allow sampling according to the above conditions.) <br /> TANK TANK SIZE 1ViLIVIMUM NUMBER LOCATION of SOIL SAMPLES <br /> # Gallons of SOIL SAMPLES <br /> < 1,000 3 ver Tank Center and Ends OR Sides of Tank <br /> 1,000- 10,000 5 REr Tank Center and Ends OR Sides of Tank <br /> > 10,000 5 OR Moreper Tank Ends and Middle and generally spaced along the <br /> length of the Tank <br /> EH 23 047(Rev 7/10/92) <br /> 7 <br />