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O.B.S. - Mataga olds/Buick <br /> I July 17, 1992 <br /> i Page -4- , <br /> 3.3 Laboratory AnalysesA. _ <br /> The samples will be analyzed for 'benzene, €_toluene, ethyl <br /> iP <br /> 1 <br /> _ F <br /> benzene, and xylene (BTEX) by EPA Method 8020,, `ffor total <br /> extractable petroleum hydrocarbons,- quantified As motor oil, <br /> '3 <br /> diesel and kerosene (TEPH) by Method 3550 TEPH,'[ .and for chromium , <br /> (Cr) , lead (Pb) ,. zinc' (Zn) , nickel_.(Ni)_, and cadmium (Cd) by <br /> atomic absorption. See Table Z below for laboratory methods and <br /> r detection limits. <br /> TABLE 1 j> <br /> Detection Limits <br /> GeoAnalytical Laboratoriesli <br /> i Analyses: B T B Y TBPH Cr }} Pb !� Zn Hi Cd <br /> i Method: 80208020 BD20 8020 3550 218.1 3 239.1; 289.1 249.1 213.1 <br /> LDetection 5.0 5.0 5.0 5.0 *50.0 2.5 j1j5 2.5 2.5 8.25 <br /> Limit: µg/kg µ41k4 µ9/kg µg/kg mg/kg mg/kg mg/kg lag/kg mg/kg mg/kg <br /> *50.0 mg/kg (motor oil) <br /> _ f <br /> �i j <br /> 3.4 Excavation Closure - - ' <br /> - The excavated soil will be stockpiled on and covered with <br /> plastic sheeting for temporary storage on site to await proper <br /> dis osal.' Following excavation- and sampling, the excavation will <br /> be backfilled with either clean imported soil or pea-gravel: If <br /> soil is used for backfilling, it will be compacted as needed with <br /> ,k soil compaction equipment. <br /> 3.5 Over-Excavation Report <br /> f A report documenting the activities de cri'! d above wild, be <br /> submitted to the San Joaquin County Environmental Health <br /> CONDOR <br />