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<br /> KEI-,391-0202.Rl
<br /> April 9, 1991
<br /> Page 2
<br /> FTELD ACTIVITIES
<br /> KEI's field work was conducted on February 20, 1991, when three
<br /> underground fuel storage tanks and one waste oil tank were removed
<br /> from the site. The tanks consisted of one 10,000 gallon. regular
<br /> unleaded fuel storage tank, one 10,000 gallon super unleaded fuel
<br /> storage tank, one 10,000 gallon diesel fuel storage tank, and one
<br /> 550 gallon waste oil tank. The tanks were made of steel and while
<br /> the waste oil tank was damaged during its removal, no apparent
<br /> holes or cracks were observed in any of the tanks. Ms. Kasey Foley
<br /> of the San Joaquin Local Health District was present during tank
<br /> removal and subsequent soil sampling.
<br /> Six soil samples, labeled Al, A2, B1, B2, C1 and C21, were collected
<br /> from beneath the fuel tanks at depths ranging from approximately
<br /> '15 5 feet..to 16.5 feet ,below grade One soil sample, labeled 'WO1,,,
<br /> was collected from beneath the .waste`, oil tank9at a depth of
<br /> approximately 11 feet below grade. Samples were collected from
<br /> bulk material excavated by backhoe. Samples were placed in clean,
<br /> two-inch diameter brass tubes, sealed with aluminum foil, plastic
<br /> caps and tape, and stored in a cooled ice chest for delivery to a
<br /> certified laboratory. sample locations are as shown on the
<br /> attached Site Plan, Figure 1. Excavated soil was stockpiled on-
<br /> site for further sampling.
<br /> Also on February 20, 1991, KEI collected soil samples from the
<br /> product pipe- trenche� . Eleben samples,. labeled Pl through P11;)
<br /> were.collected from trenches using a driven; tube-type soil sampler
<br /> .. .
<br /> at depths ranging frc5m_2 -�Co'3:5.feet below'graae�. in addition, a
<br /> the direction of the San Joaquin t6661 Health District, one soil
<br /> sample, labeled P12, was collected f)x6m .beneath the waste-oil'tanl
<br /> remote fill line at a depth of 2 feet below grade; also using a
<br /> driven, tube-type sampler. The samples were collected in the
<br /> presence of Ms. Kasey Foley of the San Joaquin County Local Health
<br /> Department. These samples were also collected in clean two--inch
<br /> diameter brass tubes, and handled as described above. After soil
<br /> sampling was completed, pipe trenches were excavated to the sample
<br /> depths. Pipe trench sample point locations are shown on the
<br /> attached Site Plan, Figure 1.
<br /> On March 19, 1991, KEI returned to the site to observe additional
<br /> soil excavation in the area of sample point C2 as outlined in KEI's
<br /> revised work Man/proposal (KEI-P91--0202.P1R) dated March 11, 1991.
<br /> Following the excavation of soil from the fuel tank pit to the
<br /> - - ---- ---------- -- -------------initial__sample_depths, _additional soil was removed from beneath
<br /> sample point location C2 to a depth of about 26 fee -below grade.-- - - -- -
<br /> One soil sample, labeled C2(26. , aas;.coll'eated from this depth,.fromf
<br /> bulk material excavated. by backioe, In addition, four soli
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