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<br /> <br /> <br />6 of 10 <br /> <br />Environmental Health Department <br />SAMPLING PROTOCOL FOR ROUTINE TANK REMOVALS <br /> <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 <br />five (5) working days pursuant to California Health & Safety Code, Section 25295. Samples cannot be combined into a <br />composite sample for analysis in the field or the lab. Each sample must have a set of corresponding analytical <br />results. <br /> WATER NOT PRESENT IN THE TANK PIT <br /> <br /> <br />TANK <br /># <br /> <br />TANK SIZE <br />(Gallons) <br /> <br />MINIMUM NUMBER <br />of SOIL SAMPLES <br /> <br /> LOCATION OF SOIL SAMPLES <br /> <br /> <br /> <br /> < 1,000 <br /> <br /> 1 per Tank Fill OR Pump End of Tank <br /> <br /> <br /> <br /> 1,000 - 10,000 <br /> <br /> 2 per Tank 1 at each End of Tank <br /> <br /> <br /> <br /> > 10,000 <br /> <br /> 3 or More <br /> per Tank <br /> Ends and Middle OR generally <br /> spaced along the length of the Tank <br /> <br /> PIPING AND STOCKPILE <br /> <br /> <br /> <br /> PIPING SOIL SAMPLES <br /> <br /> 1 Sample every 20 lineal feet <br /> <br /> <br /> <br /> TANK & PIPING STOCKPILE SAMPLES 2 Samples every 50 cubic yards <br /> <br /> <br /> WATER IS PRESENT IN TANK PIT <br /> <br />TANK <br /># <br /> <br />TANK SIZE <br />(Gallons) <br /> <br />MINIMUM NUMBER of <br />SOIL SAMPLES <br /> LOCATION of SOIL <br /> SAMPLES <br /> <br />MINIMUM NUMBER of <br />WATER SAMPLES <br /> <br /> < 10,000 <br />Single Tank 3 <br />2 from wall next to tank <br />ends at soil/groundwater <br />interface & 1 below tank <br />1 <br /> <br /> > 10,000 OR <br />Tank Cluster 5 or more <br />4 from wall next to tank <br />ends at soil/groundwater <br />interface & 1 below each <br />tank <br />1 <br /> <br /> <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 /> <br /> <br />TANK <br /> # <br /> <br />TANK SIZE <br />(Gallons) <br /> <br />MINIMUM NUMBER <br />of SOIL SAMPLES <br /> <br />LOCATION of SOIL SAMPLES <br /> <br /> <br /> <br /> < 1,000 3 per Tank Center and Ends OR Sides of Tank <br /> <br /> <br /> <br /> 1,000 - 10,000 5 per Tank Center and Ends OR Sides of Tank <br /> <br /> <br /> <br /> > 10,000 5 OR More per Tank Ends and Middle and generally spaced <br />along the length of the Tank <br /> <br />Tri-Regional Recommendations – Appendix A