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SAMPLING PROTOCOL FOR ROUTLNH TANK REMOVALS <br /> The follot<in_ represents minimum sampling criterion required for closure compliance. Soil samples collected shall be <br /> representative of native soils beneath the tanks 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 <br /> within five (5) working days pursuant to California Health & Safety Code, Section 25295. <br /> WATER NOT PRESENT IN THE TANK PTT <br /> TANK TANK SIZE MINIMUM NUMBER LOCATION OF SOIL SAMPLES <br /> # (Gallons) of SOIL SAMPLES <br /> < 1,000 I 1 per Tank 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 /> PIPING AND STOCKTILE <br /> PIPING SOIL SAMPLES j 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 I TANK SIZE MINIMUM NUMBER LOCATION of SOIL MINIMUM NUMBER of <br /> # (Gallons) of SOM SAMPLES SAMPLES WATER SAMPLES <br /> < 10,000 From wall next to tank <br /> Single Tank 2 ends at soil/ groundwater 1 <br /> interface <br /> > '0'000 OR I From wall next to tank <br /> Tank Cluster 4 ends at soil/ 1 <br /> groundwater 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 /> ---7� <br /> TA 1K TANK SI2� oMIN f SIMUM NUMB <br /> OIL SSAMPLES LOCATION of SOIL SAMPLES <br /> (Gallons) <br /> < 1 OOp 3 per Tank Center and Ends OR Sides of Tank <br /> 1,000 - 10,000 5 per Tank I Center and Ends OR Sides of Tank <br /> > 10 000 I 5 OR More per Tank �Endsnd Middle and generally spaced along <br /> gth ofthe Tank <br /> 3H 23 047 OZevised 7/10/92) Page i <br />