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OWA <br />SAMPLING PROTOCOL FOR ROUTINE TANK REMOVALS <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 (5) <br />working days pursuant to California Health & Safety Code, Section 25295. <br />WATER NOT PRESENT IN THE TANK PIT <br />TANK <br />k <br />TANK SIZE <br />(Gallons) <br />MINIMUM NUMBER <br />of SOIL SAMPLES <br />LOCATION OF SOIL SAMPLES <br />TANK & PIPING STOCKPILE SAMPLES <br />< 1,000 <br />1 per Tank <br />Fill OR Pump End of Tank <br />From wall next to tank <br />1,000 - 10,000 <br />2 per Tank <br />I at each End of Tank <br />l� <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 />WATER IS PRF.SFNT IN TANK PIT <br />TANK <br />N <br />PIPING SOIL SAMPLES <br />1 Sample every 20 lineal feet <br />LOCATION of SOIL <br />SAMPLES <br />TANK & PIPING STOCKPILE SAMPLES <br />2 Samples every 50 cubic yards <br />WATER IS PRF.SFNT IN TANK PIT <br />TANK <br />N <br />TANK SIZE <br />(Gallons) <br />MINIMUM NUMBER <br />of 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 />From wall next to tank <br />1,000 - 10,000 <br />5 per Tank <br />Single Tank <br />2 <br />ends at soil/ groundwater <br />1 <br />Ends and Middle and generally spaced along <br />the length of the Tank <br />interface <br />> 10,000 OR <br />From wall next to tank <br />Tank Cluster <br />4 <br />ends at soil/ <br />I <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 order to <br />collect the samples. (Physical removal of the obstruction will allow sampling according to the above conditions.) <br />TANK <br />q <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 />11 �/ <br />> 10,000 <br />5 OR More per Tank <br />Ends and Middle and generally spaced along <br />the length of the Tank <br />EH 23 046 (Revised 10/19/98) Page 7 <br />