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April of 1994, we discovered a previously undisclosed underground waste oil tank of <br /> approximately 400-500 gallons capacity. A small localized area of stained soils consistent <br /> with that of waste oil was observed around what appeared to be the fill pipe (confined to a <br /> couple cubic feet of soil). We also observed a localized area of soils stained and smelling <br /> of what appeared to be Diesel Fuel. A work plan was submitted for the tank removal in <br /> August of 1994. The work plan was approved and the following work commenced. <br /> EXCAVATION <br /> The tank was inerted and excavated according to the work plan. Minor soil staining was <br /> observed around the tank during excavation . The excavated tank was loaded directly onto <br /> a licensed Hazardous Waste hauler to be transported for decontamination and destruction <br /> at Erickson, Inc. 255 Parr Blvd., Richmond, California(see Attachment 2 for manifest and <br /> disposal tag). Once the tank was removed and the excavation cleared for sampling, a <br /> significant area of heavily stained soils was observed. A sample was retrieved at 10:45 <br /> A.M. on September 28, 1994 from approximately 6 feet below the tank invert (sample <br /> CCW-WOT-1) and witnessed by Mr. Eric Trevena, Senior Registered Environmental <br /> Health Specialist with the San Joaquin County Public Health Sevices, Environmental <br /> Health Division(PHS/EHD). Mr. Trevena also directed that a sample from the <br /> overburden soils from the tank be taken. This sample was collected at 10:52 A.M. and <br /> designated CCW-WOT-2. <br /> Both of these soil samples (CCW-WOT-1 and CCW-WOT-2) were transported under <br /> chain of custody documentation to, American Environmental Network, Inc., a State <br /> certified laboratory located in Pleasant Hill, California. The analytical parameters <br /> specified in the guidelines of San Joaquin County PHS/EHD were specified on the chain <br /> of custody. These included total petroleum hydrocarbons (TPH) as diesel using EPA <br /> Method 3550/8015; TPH as gasoline using EPA Method 5030/8015; volatile aromatic <br /> hydrocarbon compounds (benzene, toluene, ethylbenzene, and total xylene isomers; <br /> together BTEX)using EPA Method 8020; volatile halocarbon compounds using EPA <br /> Method 8010; PCB's using EPA Method 8080; the heavy metals cadmium(Cd), total <br /> 2 <br />