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KEI-P91-0202 .R6
<br /> January 23, 1992
<br /> Page 2
<br /> KEI ' s initial field work was conducted on February 20, 1991, when
<br /> three underground fuel storage tanks and one waste oil tank were
<br /> removed from the site. The tanks consisted of one 10, 000 gallon
<br /> regular unleaded fuel storage tank, one 10 , 000 gallon super
<br /> unleaded fuel storage tank, one 10, 000 gallon diesel fuel storage
<br /> tank, and one 550 gallon waste oil tank. The tanks were made of
<br /> steel and while the waste oil tank was damaged during its removal ,
<br /> no apparent holes or cracks were observed in any of the tanks. Ms .
<br /> Kasey Foley of the San Joaquin Local Health District was present
<br /> during tank removal and subsequent soil sampling.
<br /> Six soil samples, labeled Al , A2 , B1 , B2 , C1, and C2 , were
<br /> collected from beneath the fuel tanks at depths ranging from
<br /> approximately 15. 5 feet to 16. 5 feet below grade. One soil sample,
<br /> labeled WO1, was collected from beneath the waste oil tank at a
<br /> depth of approximately 11 feet below grade. Sample locations are
<br /> as shown on the attached Site Plan, Figure 2 .
<br /> Also on February 20, 1991, KEI collected soil samples from the
<br /> product pipe trenches . Eleven samples, labeled P1 through P11,
<br /> were collected from the trenches at depths ranging from 2 to 3 . 5
<br /> !) feet below grade. In addition, at the direction of the San Joaquin
<br /> Local Health District, one soil sample, labeled P12 , was collected
<br /> from beneath the waste oil tank remote fill line at a depth of 2
<br /> feet below grade. These samples were also collected in the
<br /> presence of Ms. Kasey Foley. After soil sampling was completed,
<br /> the pipe trenches were excavated to the sample depths. Pipe trench
<br /> sample point locations are shown on the attached Site Plan, Figure
<br /> 2 .
<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
<br /> KEI ' s revised work plan/proposal (KEI-P91-0202 .P1R) dated March 11,
<br /> 1991. Following the excavation of soil from the fuel tank pit to
<br /> the initial sample depths, additional soil was removed from beneath
<br /> sample point location C2 to a depth of about 26 feet below grade,
<br /> and one soil sample, labeled C2 (26) , was collected from this depth.
<br /> .In addition, four soil samples, labeled SW-N, SW-S, SW-E, and SW-W,
<br /> were collected from the sidewalls of the excavation at depths of
<br /> approximately 25 . 5 feet below grade. Sample point locations are as
<br /> indicated on the attached Site Plan, Figure 3 .
<br /> All samples were analyzed by Sequoia Analytical Laboratory in
<br /> Concord, California. All fuel tank pit and product pipe trench
<br /> soil samples were analyzed for benzene, toluene, xylenes and
<br /> ethylbenzene (BTX&E) , total lead, and ethylene dibromide (EDB) .
<br /> All fuel tank pit and product pipe trench soil samples, except
<br /> samples Al and A2 (collected from beneath the diesel fuel tank) ,
<br /> were also analyzed to determine levels of total petroleum hydrocar-
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