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TABLE 1. SOIL CHEMICAL DATA k <br /> Sample TPHG TPHK TPHA Ben Tol Ethyl Xyl MBTE Total Lead <br /> No. - ------mg/kg-----' ---------ug/kg-7--------,----- S --mg/kg-- <br /> PB-1-2 <br /> -mg/kg--PB-1-2 ND ND ND ND ND ND ND ND 4.3 <br /> PB-2-3 ND ND ND ND ND ND ND ND 2.5 <br /> PB-2-4 ND ND ND ND ND ND ND ND . 4.7 . <br /> PB-3-2 ND ND ND SND ND �.ND 1 ND ND 2.3 . <br /> PB-3-3 \150 -400 '�,550 300 98 180 330 ND 2.2 <br /> PB-3-2 ND ND ND ND ND ND ND ND 2.5 <br /> PB-4-2 ND ND ND ND ND ND ND ND 2.1 <br /> PB-5-2 ND ND ND ND ND ND ND ND 4.0 <br /> PB-6-2 ND ND ND ND ND ND ND ND 3.7 <br /> Blank ND ND ND ND ND ND ND ND ND <br /> TABLE 2. GROUNDWATER: CHEMICAL DATA <br /> Sample TPHG TPHK TPHA Ben Tol Ethyl Xyl MBTE Total Lead <br /> No. --------------------------ug/l------------------------- <br /> PB-11 <br /> ------------------------PB-1 ND ND ND ND ND ND ND ND ND <br /> PB-2 1370 \400 '-770 � 3.8 13.9 ` 2.2 5.8 ND ND <br /> PB-3 `600 --690 -,1300. \2.8 2.5 `4.4 6.9 ND ND <br /> 41— PB-4 87 -200 X290 ND ND "-0.5 X2.8 ND ND <br /> PB-5 ND ND ND ND ND ND ND ND ND <br /> PB-6 ND ND ND ND ND ND ND ND ND <br /> Blank ND ND ND ND ND ND ND ND ND <br /> ND - Not Detected mg/kg - milligram per kilogram <br /> ug/kg - microgram per kilogram ug/l - microgram per liter <br /> Note: Aviation fuel has components of gasoline and kerosene with a mixed hydrocarbon <br /> range from C6 to C17; the laboratory has broken.these components out in the reports. <br /> Discussion <br /> The dissolved contaminants appear to have migrated in a northeasterly direction from the <br /> former tank pit area, with some movement toward PB-4 (see Figures 1). Field evidence <br /> indicates that the migration in. the shallow aquifer has occurred along or just below the <br /> capillary fringe. . Contaminants were present in vadose zone soils at. PB-2 and PB-3 directly <br /> under the former tank or dispensing product lines. On the basis of previous sampling and data <br /> herein, the clayey soil under the tank and dispenser appeared to have absorbed some fuel. The <br /> most elevated TPH fuels and BTEX concentrations occurred at PB-2 and 'PB-3, roughly in the <br /> center of the site at the former tank pit and dispenser respectively. This would support a <br /> relatively slow dissolved plume easterly movement. Dissolved plume movement may also be <br /> influenced by canal leakage just to the north, where recharge under the canal may cause an <br /> easterly deflection in motion. <br /> Haley Flying Services Project No. 4111 Page 5 <br />