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SAN J8,tQUIN COUNTY PUBLIC HEALTH SERVICES <br />SAMPLING PROTOCAL FOR ROUTINE TANK REMOVALS <br />The following represents minimum sampling criterion required for closure compliance. <br />Soil samples collected shall be representative of native soils beneath the tank's <br />invert [tank's bottom] at a collection depth not to exceed 2 - 4 feet. If contamination <br />is documented during closure, an Unauthorized Release Notification must be completed and <br />submitted within 5 working days. California Health & Safety Code -Sec. 25295. <br />WATER NOT PRESENT IN THE TANK PIT <br />if <br />TANK SIZE MINIMUM NUMBER of <br />SOIL SAMPLES <br />LOCATION of SOIL SAMPLE <br />LOCATION of SOIL <br />SAMPLES <br />LESS THAN 1,000 GALLONS ONE per tank <br />Fill or pump end of tank <br />10,000 GALLONS <br />1,000 - 10,000 GALLONS TW per tank <br />One at each end of tank <br />LESS THAN 1,000 GALLONS <br />10,001 GALLONS and UP THREE or MORE <br />per tank <br />Ends and Middle or <br />generally spaced along <br />the length of the tank <br />PIPING ONE per EVERY 20 LINEAL FEET <br />WATER IS PRESENT IN TANK PIT <br /># <br />TANK SIZE <br />MINIMUM NO. of <br />SOIL SAMPLES <br />LOCATION of SOIL <br />SAMPLES <br />MINIMUM NUMBER <br />of WATER SAMPLES <br />10,000 GALLONS <br />From wall next to <br />LESS THAN 1,000 GALLONS <br />THREE per tank <br />or LESS <br />tank ends at soil/ <br />FIVE per tank <br />Center and ends or sides <br />(Single Tank) <br />TWO <br />groundwater <br />ONE <br />tank <br />interface <br />GREATER THAN <br />the length of the tank <br />From wall next to <br />10,000 GALLONS <br />FOUR <br />tank ends at soil/ <br />or <br />groundwater <br />ONE <br />TANK CLUSTER <br />interface <br />SLAB PRESENT IN TANK PIT <br />Soil samples shall be obtained beneath the slab within native soils. Penetration through <br />the obstruction will be required in order to collect the samples. [Physical removal of <br />the obstruction will allow sampling according to the above conditions.] <br /># <br />TANK SIZE <br />MINIMUM NUMBER of <br />LOCATION of SOIL SAMPLES <br />SOIL SAMPLES <br />LESS THAN 1,000 GALLONS <br />THREE per tank <br />Center and ends or sides <br />1,000 - 10,000 GALLONS <br />FIVE per tank <br />Center and ends or sides <br />10,000 GALLONS and UP <br />FIVE or MORE per <br />Ends and Middle and <br />tank <br />generally spaced along <br />the length of the tank <br />EH 23 047 (Rev 11/7/90) ft <br />Page 7 <br />