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(note Plate 2). Mr. Al Clark of Valley Welding Supply and Mr. Lanny R. <br /> ' Williams were both cooperative during the field-work operation. <br /> ' All three steel tanks were of single-walled construction. The <br /> tanks are estimated to be more than 30 years old. Additional <br /> detailed site-specific information and tank characteristics are <br /> ' provided on Plate 2. <br /> ' Only two of the four tanks were known to exist when the project <br /> commenced. One was the concrete vault (tank #1) that had a 2' by 2' <br /> access opening in the exposed top. This vault contained a <br /> ' considerable amount of debris, including tires, bricks, cans, shoes, <br /> tree limbs, pipe, and other material. The other tank (tank #2) was <br /> ' located to the north of tank vault#1 . The top of tank #2 was buried <br /> approximately three feet below grade. <br /> ' During the excavation of tank #2, another tank manifold and <br /> additional piping was uncovered. This led to the discovery of tank <br /> #3 which had been apparently connected to a previously-removed <br /> ' pump for dispensing of fuel. <br /> ' Yet another tank (i.e., tank #4) was discovered during the <br /> cleanup procedures on tank #3. Piping was found leading from tank <br /> #3 to the north. Further investigation revealed that tank #4 was <br /> capped by a concrete foundation. This foundation was 38'-long by <br /> 8'-wide by 2' thick which required removal in order to liftout tank <br /> t #4. The base of the tank #4 was about 13' below grade. <br /> The tanks on the site were positioned end-to-end. Except for <br /> ' the vault, the other tanks were completely buried below grade. The <br /> fencing surrounding the structure was torn down and associated <br /> ' piping was disconnected and removed. <br /> The subsurface geologic conditions that characterize the soils <br /> ' surrounding the UST's consist of two different soil units. The upper <br /> unit is predominantly sandy and extends from ground surface to a <br /> ' depth of about 4 feet below grade. This unit appears to be native <br /> soils as stratification contacts within the unit could be observed <br /> where vertically exposed on the sides of the excavation walls. <br /> ' Beneath this unit and to the excavation depths explored, a very dense <br /> clay unit was exposed. This clay unit can be otherwise described as <br /> 2 <br />