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D. During excavation, the Engineer will monitor soils for the presence of <br />organic vapors and will make available to the Contractor the results <br />of monitoring. If vapor monitoring or visible staining indicate that <br />tank product is present in the excavated soil, soils will be <br />segregated into separate stockpiles as directed by the Engineer. <br />Excavation will continue until the tanks are removed. Where the <br />Contractor is required to stockpile soil separately due to possible <br />presence of tank product, Contractor shall place soil on plastic <br />sheeting and cover stockpiles with plastic sheeting at no additional <br />cost to the Owner. Contractor shall also cover the excavated hole if <br />directed by the Engineer at no additional cost to the Owner. <br />E. Periodically during excavation, the Contractor shall, at the <br />Engineer's direction, provide a backhoe bucket full of soil from the <br />excavation from which the Engineer will obtain a sail sample. <br />F. Care must be taken to avoid breaking existing product lines until they <br />are drained of all remaining product. Drain product from lines back <br />into tank. Remove all product lines and dispose of as required. <br />G. If tank product is detected in soils below the tanks as determined by <br />the Engineer, the Contractor shall continue to excavate and stockpile <br />soils, at the direction of the Engineer, to a maximum depth of fifteen <br />(15) feet. <br />3.02 TANK REMOVAL <br />A. Contractor shall remove and dispose of remaining product from tank and <br />piping as necessary. Contractor shall provide pump as necessary. All <br />product removed from tanks and piping shall be disposed of by a <br />favorably reviewed industrial waste recycling company. <br />B. Contractor shall provide an explosion -proof combustible gas meter <br />capable of monitoring lower explosion limit (LEL) and oxygen levels of <br />the tanks, and shall monitor LEL and oxygen levels of the tanks at <br />least once per hour during removal from the ground and while they are <br />on-site. <br />C. Tank vapors shall be rendered inert by placing a minimum of 1.5 pounds <br />of solid carbon dioxide (dry ice) for each 100 -gallons of tank volume. <br />Allow one hour for oxygen displacement. Chemical concentrations in <br />tank vapor shall be less than 15 percent of the appropriate LEL and <br />oxygen 10 percent or less prior to removal of tanks. <br />D. Immediately notify Engineer when any contaminated soil or free product <br />is found during any phase of the removal of the underground tank or <br />piping. <br />Cal -Farm 02071 - 3 882526.01 <br />5 December 1989 <br />WPSPECS2:02071CAL.FRM <br />i <br />