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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 <br /># <br />TANK SIZE <br />(Gallons) <br />MINIMUM NUMBER <br />of SOIL SAMPLES <br />LOCATION OF SOIL SAMPLES <br />MINIMUM NUMBER of <br />WATER SAMPLES <br />< 1,000 <br />1 per TankFill <br />OR Pum End of Tank <br />2 from wall next to tank <br />1,000 - 10,000 <br />2 per Tank <br />1 at each End of Tank <br />3 <br />> 10,000 <br />3 or More <br />per Tank <br />Ends and Middle OR generally <br />spaced along the length of the Tank <br />PIPING AND STOCKPILE <br />PIPING SOIL SAMPLES <br />1 Sample every 20 lineal feet <br />TANK & PIPING STOCKPILE SAMPLES <br />2 Samples every 50 cubic yards <br />WATER IS PRESENT IN TANK PIT <br />TANK <br /># <br />TANK SIZE <br />(Gallons) <br />MINIMUM NUMBER of <br />SOIL SAMPLES <br />LOCATION of SOIL <br />SAMPLES <br />MINIMUM NUMBER of <br />WATER SAMPLES <br />< 1,000 <br />< 10,000 <br />Center and Ends OR Sides of Tank <br />2 from wall next to tank <br />1,000 - 10,000 <br />5 per Tank <br />Single Tank <br />3 <br />ends at soil/groundwater <br />1 <br />Ends and Middle and generally spaced <br />along the length of the Tank <br />interface & 1 below tank <br />4 from wall next to tank <br />> 10,000 OR <br />5 or more <br />ends at soil/groundwater <br />1 <br />Tank Cluster <br />interface & 1 below each <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 <br /># <br />TANK SIZE <br />(Gallons) <br />MINIMUM NUMBER <br />of SOIL SAMPLES <br />LOCATION of SOIL SAMPLES <br />< 1,000 <br />3 per Tank <br />Center and Ends OR Sides of Tank <br />1,000 - 10,000 <br />5 per Tank <br />Center and Ends OR Sides of Tank <br />> 10,000 <br />5 OR More per Tank <br />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 8/1/11) 6 <br />