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_ F O.B.S. - Mataga Olds/Buick <br /> July 17, 1992 <br /> Page -2- <br /> Appendix A) . The tank had been used to receive used oil from the <br /> Mataga maintenance shop.- A Condor'representative was present <br /> during the tank removal to monitor�the . act ' ities and collect <br /> soil samples. Eric Trevena of the San JoaquinCounty <br /> Environmental Health Department was• on sit to observe the tank T ; <br /> removal and sampling procedures. <br /> 1[Tpon. removal,. the-tank.appeared to be ;in�good- condition, <br /> however_hyd�o6arban—at aining was present on thenorth, east and. <br /> west sides of the excvat <br /> aion to adepth of approximately T. <br /> feet <br /> below .the _grou_nd_ sur face (BGS),,. The tank, cradle was <br /> approximately 4 .5 feet BGS. Two soil samples were collected from <br /> the excavation. One sample was taken fromithe '�north sidewall at <br /> a depth of 3 feet BGS and one was taken from beneath -the west end <br /> of the tank at a depth:. of 5 feet BGS (See Figure 2 for samp <br /> e <br /> locations) . Laboratory ana]yses-reported that. otor..oil <br /> _(5,900 <br /> i , <br /> � g%kg)., xyfeney_(�3,Q00 µg/kg)-, ethyl benzene (i 600' pg/kg) and <br /> Various metals were detected in'the north sidewall sample. ; In . <br /> the sample collected from beneath the west ;end _fo� the tank, zinc. <br /> (27 mg/kg) and lesser amounts of chromium and ,n ckel were <br /> ' detected. Neither diesel, PCB's- nor chlorinated hydrocarbons <br /> were detected in either of the two soil samples,. For additional <br /> J. <br /> tank removal information refer to Tank PulI Testing Results,, <br /> 6 <br /> Mataga Olds/Buick, prepared by Condor, dated 6/.r19/91. <br /> AL <br /> CONDOR <br /> JI <br /> a `P <br />