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UNDERGROUND STORAGE TANK REMOVAL 48 North Wilson Way, Stockton, California for R. J. Rishwain D.D.S Stockton, California As requested by Dr. R. J. Rishwain, D.D.S. the abandoned under- ground fuel storage tank situated on the property at 48 North Wilson Way, Stockton, California was located, removed, and disposed of by ROY F. WESTON, INC. (WESTON) and their subcontractor, Decon Environmental Services, Inc. These activities occurred on September 7 and 11, 1989. Activities on September 7, 1989 consisted of clearing the work site to allow for excavation of the underground storage tank and thoroughly cleaning the tank. The underground -storage tank was cleaned internally by steam cleaning 3 times. Residual wash water from each steam cleaning was pumped off and containerized after each washing. The containerized wash waters were disposed of at Hedrich Distribution/Bayside Oil Company in Santa Cruz, California. The tank's location can be seen on Figure 1. The underground fuel tank was removed and disposed of on September 11, 1989 along with the containerized wash water from steam cleaning of the tank. The tank disposal was conducted in accordance with applicable regulation and was accompanied by a California Hazardous Waste Manifest. The tank was disposed of with Erickson, Inc. in Richmond, California. To evaluate the possible presence of petroleum hydrocarbon compounds within the soils, two samples were collected. One soil sample was collected from a depth of 3 feet beneath the bottom of the tank (designated T-1) and another was collected from soil directly underlying the pipe leading to the surface (designated P-1) . These sample locations are noted on Figure 1. The soil samples were immediately submitted to WESTON Analytics' laboratory for analysis. The samples were analyzed for the following: o Total Petroleum Hydrocarbons (Light) - EPA Method 8015 o Benzene, Toluene, Xylene, and Ethyl-Benzene (BTX&E) - EPA Method 8020 o EDB - D.H.S. approved method o Total lead - EPA approved Method 7420 The soil samples were collected in the following manner. The soil beneath the removed underground storage tank was brought to the surface using a steam cleaned backhoe bucket. Soil was removed from the surface and a clean 2 inch diameter hollow brass tube was driven into the less disturbed soil within the bucket. The brass tube was then removed full of soil, the ends of the tube covered with aluminum foil, capped with plastic end caps and then sealed with electrical tape. The sample of soil from beneath the pipeline �' was collected in the same manner except the tube was driven