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' MRC Y L ADiS GERAGH7 &MI LER An experienced field geologist working under the supervision of a California ' Registered Geologist maintained the detailed log of activities and collected field data The on- site geologist produced a detailed geologic log of the boring, conducted field analyses of soil samples, and properly packaged and labeled samples for possible laboratory analysis All drilling and sampling equipment was thoroughly cleaned prior to and following use at each drilling location and sample interval The cleaning procedures consisted of steam cleaning or triple-rinse cleaning methods The tnple-nnse clearing method employed consisted of washing the equipment in potable water with a cleansing solution, nnsmg in potable water, then rinsing with distilled water All drill cuttings and decontamination water were placed in DOT-approved 55-gallons drums which were labeled and left on-site pending final disposition 4.3 LABORATORYANALYSES Soil and water samples selected for analysis were provided under proper chain-of- custody hain-ofcustody protocol to either the on-site, state-certified mobile laboratory(Baseline Laboratories - Certification#2284)provided by BC Laboratories, Inc (BC) located in Bakersfield, California or directly to BC (Certification#1186) ' 4 3 1 Soil Selected soul samples were analyzed for TPHg using Environmental Protection Agency ' (EPA) modified Method 8015 and BTEX and MTBE using EPA Method 8020 In addition, samples with reported concentrations of NME by Method 8020 were reanalyzed at a fixed- site laboratory for MTBE, ch-isopropyl ether, ether tertiary butyl ether, t-amyl methyl ether, and teraary butanol using EPA Method 8260 No special steps were taken to dewater samples collected from the saturated zone prior to analysis All soil samples were handled using protocols identical to those used for soil samples taken from the vadose zone and in accordance with standard environmental investigation procedures ' 17