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SAN JOAQUIN Environmental Health Department <br /> _ COUNTY <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 <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 /> TANK TANK SIZE MINIMUM NUMBER LOCATION OF SOIL SAMPLES <br /> # (Gallons) of SOIL SAMPLES <br /> 4e- 40NW10 , 000 2 perTank 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 STOCKPILE <br /> PIPING SOIL SAMPLES 1 Sample every 20 lineal feet <br /> gc_ TANK & PIPING STOCKPILE SAMPLES 2 Samples every 50 cubic yards <br /> WATER IS PRESENT IN TANK PIT <br /> TANK TANK SIZE MINIMUM NUMBER of LOCATION of SOIL MINIMUM NUMBER of <br /> # (Gallons) SOIL SAMPLES SAMPLES WATER SAMPLES <br /> < 10 , 000 2 from wall next to tank <br /> Single Tank 3 ends at soil/groundwater 1 <br /> interface & 1 below tank <br /> 4 from wall next to tank <br /> > 10 , 000 OR ends at soil/groundwater <br /> Tank Cluster 5 or more interface & 1 below each 1 <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 <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 /> mµ,4 < 1 , 000 3 per Tank Center and Ends OR Sides of Tank <br /> 1 , 000 - 101000 5 perTank Center and Ends OR Sides of Tank <br /> > 10 , 000 5 OR More per Tank Ends and Middle and generally spaced <br /> along the length of the Tank <br /> Tri- Regional Recommendations — Appendix A <br /> 6of10 <br />