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SAMPLING PTtOTOCOL FOR ROUTINE TANK RENtVALS <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 <br /> within five (5) working days pursuant to 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 /> E 1,000 1 per Tank Fill OR Pump End of Tank <br /> 1,000 - 10,000 2 per Tank i 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 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 PRF-,SENT IN TANK PIT <br /> TANK TANK SIZE MINIMUM NUMBER LOCATION of SOIL MINIMUM NUMBER of <br /> # (Gallons) of SOIL SAMPLES SAMPLES WATER 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 %vall next to tank <br /> Tank Cluster 4 ends at soil/ 1 <br /> groundwater interface <br /> S1.r B PRE-SENT IN TIIE TANK PIT <br /> Soil samples shall be obtained beneath the stab 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 MINIMUM NUMBER LOCATION of SOIL SAMPLES <br /> # (Gallons) of SOIL SAMPLES <br /> c 1,000 3 per Tank Center and Ends OR Sides of Tank <br /> 1,000 - 10,0{}0 5 per Tank Center and Ends OR Sides of Tank <br /> > 10,000 5 OR More per Tani, ends and Middle and generally spaced along <br /> th:; length of the Tank <br /> EH 23 047 (Revised 7/10/92) Page 7 <br />