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KEI-P91-0202.R5
<br /> October 16, 1991
<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 /> allon
<br /> removed from the site. The tanks consisted of one 1511
<br /> os gsuper
<br /> regular unleaded fuel storage tank, one 10,000 g
<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 lhwaste oil cracks were k was observed bservedmined during its any of the tanks.ovMs.
<br /> no apparent holesor
<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 C_2, 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 frog. the
<br /> product pipe trenches. Eleven samples, labeled P1 through P11,
<br /> were collected from the trenches
<br /> the at depths
<br /> direcranging
<br /> tt£c� "an JoL�quin
<br /> feet below grade. In addition,
<br /> il sample, labeled P12, wa collected
<br /> Local Health District, one so
<br /> from beneath the waste oil tank remote fill line at a dE.pth of 2
<br /> feet below grade. The samples were collected ?.z the presance of
<br /> Ms. Kasey Foley of the San Joaquin County Local yea'lth r,-
<br /> partner`-After soil sampling wa e trench sample point locat oncompleted, pipe trenches s cire -qhown on
<br /> exca,i3ted to
<br /> the sample depths. Pip
<br /> the attached Site Plan, Figure 2.
<br /> On March 19, 1991, KEI returned to the site to ovserv;. additional
<br /> soil excavation in the area of samKEIpP91le doint C2, as oL.tlined 0202.F1R; ;+a:ac: March 11,E
<br /> KEIIIs revised work plan/proposal
<br /> 1991. Following the excavation of soil from the feel tank pit to
<br /> the initial sample depths, additional soil was removed f'r4,n 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 int locations adepth are as
<br /> of
<br /> approximately 25.5 feet below grade. Sample p
<br /> indicated on the attached Site Plan, Figure 3.
<br /> All samples were analyzed by sequoia Analyticoadluc�abor Laboratory
<br /> ry in
<br /> - - -- --- -- - Concord,--California•---_All fuel tank pit and p p ene r and_
<br /> ch
<br /> soil samples were analyzed
<br /> f
<br /> -- - -
<br /> or benzene; -
<br /> toluene,
<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 the fuel tank pit, were also
<br />
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