|
r
<br /> w
<br /> .i
<br /> KEI-P89-1104 . P2
<br /> January 10, 1990
<br /> Page 2
<br /> native soil from the fuel tank pit below sample point
<br /> location A2 at a depth of 25.5 feet, and below sample point
<br /> location B2 at a depth of 26.5 feet, respectively. Four
<br /> soil samples, labeled SW1 (13) , SWI (19) , SW2 (20/13) and
<br /> SW2 (20/19) , were also collected of native soil from the tank
<br /> pit sidewalls at depths of 13 and 19 feet. On December 7 ,
<br /> 1989 , two additional soil samples, labeled SW3 (20/13) and
<br /> SW3 (20/19) , were collected from the tank pit sidewalls at
<br /> depths of 13 and 19 feet, respectively. On December 13 ,
<br /> 1989 , KEI completed sampling of the old fuel tank pit when
<br /> three sidewall soil samples, labeled SW4 (3) SW5 and SW6,
<br /> were collected from the northerly half of the old fuel tank
<br /> pit at a depth of approximately 16 feet. Also on December
<br /> 13 , 1989, four additional samples of native soil, labeled
<br /> P1 (6) , P2 (17) , P3 (5) and P4 (8) , were collected from the
<br /> product pipe trenches at sample point locations PI, P2, P3
<br /> and P4 , respectively. Sample depths ranged from 5 to 17
<br /> feet. Samples were collected from bulk material excavated
<br /> by backhoe, taken and handled as previously described.
<br /> Sample point locations are as shown on the attached Site
<br /> Plan, Figure 3. After sampling, the product pipe trenches
<br /> were excavated to the sample depths. Upon review of the
<br /> laboratory analyses for these samples, a 15-inch diameter
<br /> casing (14 feet deep) was installed near sample point
<br /> location P2 (17) . After completion of the soil sampling on
<br /> December 13 , 1989, a water sample was taken from the on-site
<br /> domestic well system after purging a minimum of three piping
<br /> volumes. The sample was also taken only while the pump was
<br /> operating to avoid drawing water from the holding tank.
<br /> All samples were analyzed by Sequoia Analytical Laboratory
<br /> in Redwood City, California and were accompanied by properly
<br /> executed Chain of Custody documentation. Analytical results
<br /> of the final soil samples collected from beneath the fuel
<br /> storage tanks, (samples Al, A2 (25.5) , B1 and B2 (26.5) ) ,
<br /> indicate levels of TPH as gasoline ranging from non-detec-
<br /> table to 1. 7 ppm, with non-detectable levels of ethylene
<br /> dibromide. Analytical results of the soil samples, col-
<br /> lected from sidewalls of the fuel storage tank pit, indicate
<br /> levels of TPH as gasoline ranging from non-detectable to 16
<br /> ppm, levels of ethylene dibromide ranging from non-detec-
<br /> table to 0. 014 ppm, and levels of benzene ranging from non-
<br /> detectable to 0. 58 ppm. Analytical results of the final
<br /> soil samples collected from product pipe trenches, (samples
<br /> P1 (6) , P2 (17) , P3 (5) and P4 (8) ) , indicate levels of TPH as
<br /> gasoline ranging from non-detectable to 1.7 ppm, with non-
<br /> detectable levels of benzene, except sample P2 (17) , which
<br /> showed 71200 ppm of TPH as gasoline and 170 ppm of benzene.
<br />
|