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4.8 Laboratory Analyses The analysis of the soil and groundwater samples collected during the field activities will be performed by American Environmental Network (AEN) of Pleasant Hill, California, a California-certified analytical laboratory Soil samples will be analyzed for benzene, toluene, ethylbenzene, and total xylenes (BTEX) (EPA Method 8020), polynuclear aromatics (PNAs) (EPA Method 8270), and total extractable petroleum hydrocarbons (TEPH) for Cg-C36 (EPA Method 8015M with crude oil standard) Fingerprinting using the Gas Chromatograph—Flame Ionization Detector (GC-FID) method will be performed on samples with TPH-impacted soils At least two samples will be obtained for this analysis Friedman and Bruya, Inc , of Seattle, Washington, will perform the fingerprinting analysis Groundwater samples will be analyzed for BTEX constituents (EPA Method 8020), PNAs (EPA Method 8270), total purgeable petroleum hydrocarbons (TPPH) for C4-C,2 (EPA Method 8015 with gasoline standard), and TEPH for C1CC24 (EPA Method 8015M with diesel standard) Because of potential interference with soluble nonpetroleum hydrocarbons and nondissolved petroleum sorbed to particulates entrained in the groundwater samples,the removal of these interferences will be performed using a silica gel cleanup A summary of the proposed laboratory analyses is provided in Table 3 4.9 Decontamination and Waste Containerization Drilling equipment will be steam-cleaned within a self-contained unit provided by the drilling subcontractor and after drilling each boring Soil sampling equipment will be cleaned between sampling intervals with an Alconox' and water solution followed by a triple rinse using tap water and deiomzed water Deionized water will be used during third rinse • Preliminary Site Investigation Work Plan-Draft June 30 1998 Roberts Property(Former Vernalis Pump Station) Vernalis,California 14