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' Nov 2 1995 <br /> November 2 , <br /> Page 7 <br />' ppm), and zinc (61 to 85 ppm) Purgeable halogenated hydrocarbons, cadnuum, and <br /> lead were not detected <br />' Soil analytical data are presented in Tables 1 through 3 Certified analytical reports are <br /> presented as Attachment C <br />' Groundwater Analytical Results <br /> Groundwater analytical data indicate that TPH-g was detected in U-1 and U-2 at <br /> concentrations of 6,200 and 780 parts per billion(ppb), respectively (Figure 9) <br /> Dissolved benzene was detected in,U-1 and U-2 at concentrations of 15 and 2 1 ppb, <br /> respectively Wells U-1 and U-2 contained dissolved TPH-d concentrations of <br /> 1,800 and 190 ppb, respectively <br /> Well U-3 contained no detectable dissolved concentrations of TPH-g, TPH-d, or <br />' BTEX compounds, however, chlorin cs were detected, Tetrachloroethene <br /> (PCE) and trichloroethene (TCE) were detected at concentrations of 6 7 ppb and <br /> 0 51 ppb, respectively <br /> Groundwater analytical data are presented in the MPDS Quarterly Data Report, included <br /> as Attachment D <br /> EXPLORATORY TRENCHING RESULTS <br />' PACIFIC excavated three exploratory test pits on June 26, 1995, to confirm the fate of the <br /> two UST complexes identified on the 1921 and 1950 general arrangement plans (Figures 3 <br /> and 4) The test git locations are shown on the Site Plan, Figure 2 The excavations were <br />' performed under the observation of PACIFIC and Unocal staff personnel, and Mr Michael <br /> Infiirna of the PHS/EHD <br /> Test Pits TP-1 and TP-2 were located to confirm the presence of the second <br /> generation USTs located west of the former station building Each test pit was <br /> excavated to a final dimension of 10 feet long by 2 feet wide by 5 feet deep USTs <br /> were not encountered in these excavations Instead,station demolition debris was <br /> exposed throughout the TP-1 and TP-2 excavations This debris consisted of broken <br /> chunks of asphalt, pieces of metal, floor tile, glass, and large slabs of concrete (2'x 4' <br /> x 3") Boring U-G* was ternunated at 3 5 feet bgs due to auger refusal <br /> corresponding to one of the larger slabs of concrete It is interpreted that the 2,600- <br /> gallon, 4,000-gallon, and 6,000-gallon USTs, in the vicinity of TP-1 and TP-2 were <br /> removed at that time of the 1965 station demolition <br /> Test Pit TP-3 was located at the northern property boundary to confirm the presence <br /> of the first generation USTs noted on the 1921 general arrangement plan The test <br /> _ 3100971AIREPORT _ <br /> i <br /> l� <br />