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KEl-P89-1104 .R9
<br /> December 17 , 1992
<br /> Page 3
<br /> completed sampling of the old fuel tank pit when three sidewall
<br /> soil samples, labeled SW4 (3) , SW5 , and SW6 , were collected from the
<br /> northerly half of the old fuel tank pit at depths of approximately
<br /> 16 feet below grade. Sample point locations are shown on the
<br /> attached Figure 3 . Also on December 13 , 1989 , four additional soil
<br /> samples , labeled P1 (6) , P2 (17) , P3 (5) , and P4 (8) , were collected
<br /> from the product pipe trenches beneath sample point locations P1,
<br /> P2 , P3 , and P4 , respectively. These sample depths ranged from 5 to
<br /> 17 feet below grade. The sample point locations are as shown on
<br /> the attached Figure 4 . After sampling, the product pipe trenches
<br /> were excavated to the sample depths. Upon review of the laboratory
<br /> analyses for these samples, a 15-inch diameter casing ( 14 feet
<br /> deep) was installed near sample point location P2 ( 17) .
<br /> After completion of the soil sampling on December 13 , 1989 , a water
<br /> sample was collected from the on-site domestic well system (after
<br /> the well was purged of a minimum of three casing volumes) . The
<br /> sample was collected whale the pump was operating in order to avoid
<br /> drawing water from the existing holding tank.
<br /> All samples were analyzed by Sequoia Analytical Laboratory in
<br /> Redwood City, California. All soil samples were analyzed for total
<br /> petroleum hydrocarbons (TPH) as gasoline, benzene, toluene,
<br /> xylenes, and ethylbenzene (BTX&E) , tetraethyl lead, and ethylene
<br /> dibromide. The waste oil tank bottom sample and the waste oil
<br /> remote fill piping sample were analyzed for total extractable
<br /> petroleum hydrocarbons (TEPH) , BTX&E, EPA method 8010 constituents,
<br /> PCB' s, and the metals cadmium, chromium, lead, and zinc. The water
<br /> sample collected from the domestic well system was analyzed for TPH
<br /> as gasoline, BTX&E, EPA method 8010 constituents, tetraethyl lead,
<br /> and ethylene dibromide.
<br /> Analytical results of the final soil samples collected from beneath
<br /> the fuel storage tanks [samples Al, A2 (25 . 5) , B1 , and B2 (26 . 5) ]
<br /> indicated levels of TPH as gasoline ranging from non-detectable to
<br /> 1. 7 ppm, with non-detectable levels of ethylene dibromide.
<br /> Analytical results of the soil samples collected from the sidewalls
<br /> of the fuel storage tank pit indicated levels of TPH as gasoline
<br /> ranging from non-detectable to 16 ppm, levels of ethylene dibromide
<br /> ranging from non-detectable to 0 014 ppm, and levels of benzene
<br /> ranging from non-detectable to 0 . 58 ppm. Analytical results of the
<br /> soil sample collected from the new tank pit indicated non-detect-
<br /> able levels of all constituents analyzed. Analytical results of
<br /> the final soil samples collected from product pipe trenches
<br /> [samples P1 (6) , P2 ( 17) , P3 (5) , and P4 (8) ] indicated levels of TPH
<br /> as gasoline ranging from non-detectable to 1 . 7 ppm, with non-
<br /> detectable levels of benzene, except for sample P2 (17) , which
<br /> showed 7 , 200 ppm of TPH as gasoline and 170 ppm of benzene.
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