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I SAMPLIN -PROTOCOL FOR ROUTINE TANK REN 6VALS i I 'Ilse following represents m inhumn sampling criterion required for closure compliance. Soil samples collected shall be representalive of native soils beneath the tank's invert(tank's bottom) at a collection depth not to exceed 2 - 4 feet. If conlaminatlon is documented during closure, an Unauthorized Release Notification must be completed and submitted within five (5) working days pursuant to California Health & Safety Code, Section 25295. WATER NOT PRPSENT IN 771E TANK PIT TANK TANK SIZE MINIMUM NUMBER LOCATION OF SOIL SAMPLES A (Onllons) or SOIL SAMPLES < 1,000 1 per Tank Fill OR Pump End of Tank I'm() - 10,11(10 2 per Tank I at each End of Tank > 10,000 3 or More Ends and Middle OR generally per Tank spaced along the length of the Tank PIPING AND STOCKPILE �( PIPINO SOIL SAMPLES I Sample every 20 lineal feet �h-- TANK & PIP INO STOCKPILE SAMPLES 2 Samples every 50 cubic yards WA'T'ER IS PRESENT IN TANK PIT TANK 'TANK SIZE MINIMUM NUMBER LOCATION of SOIL MINIMUM NUMBER of (Gnllons) of SOIL SAMPLES SAMPLES WATER SAMPLES < 10,000 From wall next to tank Single Tank 2 ends at soil/groundwater 1 Interface > 100V OR From wall next to lank Tank Cluster 4 ends at soil/ 1 groundwater interface I. SLAB PRESENT IN THE TANK PIT Soil samples shall he obtained beneath the slab within native soils. Penetration through the obstruction will be required In order to collect the samples. (Physical removal of the obstruction will allow sampling according to the above conditions.) TANK TANK SIZE MINIMUM NUMBER LOCATION of SOIL SAMPLES„ A' (Gallons) of SOIL SAMPLES < 1,000 3 per Tank Center and Ends OR Sides of Tank l,(XX) • 10,000 5 per Tank Center and Ends OR Sides of Tank i > 10,000 5 OR More per Tank Ends and Middle and generally spaced along the length of the Tank Eft 23 047 (Revised 7/10/92) Page 7