REMOVAL_1988 - Laserfiche WebLink

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' REMOVAL PROCEDURES Excavation/Removal The steps for completing the tank excavation and removal were as follows: 1 . Excavated existing surface materials and soils to expose the top surface of the tank. This also included excavation of the product 1 supply lines and vents connected to the tank. 2. Removed fill neck and confirmed that product had been removed. The tank was then rendered inert by using dry ice. A minimum of ' 1 .5 pounds of dry ice was added per 100 gallons of tank volume. 3. Continued excavation operations until the tank was free and clear for removal . 4. Used cable rigging to remove the tank from the excavation. 5. After the tank had been removed from the excavation, the soil underlying the tank was inspected for the presence of product. Based upon field observations and regulations, the field engineer/geologist then made a decision regarding the need for additional excavation. A soil sample was collected and analyzed within 48 hours for the constituents described in the next section. The need for further excavation depended upon the results of the ' laboratory analyses. 6. The excavated tank was manifested and transported as hazardous waste. Erickson Trucking, Inc. , of Richmond, California, transported the tank. 7. After excavation and sampling were completed, the pit was backfilled and the site restored to its original condition. Collection and Analyses of Soil Samples ' After tank removal and excavation, a soil sample was obtained from beneath the tank. The soil was obtained from the bottom of the pit with a backhoe. The soil sample was collected using a two-inch by four-inch brass sample tube, which was pressed into the soil in the backhoe bucket. The ends were sealed with aluminum foil , capped, labeled, sealed in a zip lock bag, and immediately placed on ice in an insulated cooler. The sample was kept in possession of the engineer/geologist until delivery to the laboratory.