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i i 12 January 2004 AGE-NC Project No. 03-1079 Page 3 of 5 The ground water sample was collected at 65 feet bsg in the for,ier tank pit area..using a Geoprobe f hydropunch sampling assembly.The probe rods were advanced to the desired depth,then the hollow steel rods were pulled up four feet exposing a PVC screen in the saturated zone. Ground water was allowed to enter the screen, and samples were retrieved using a modified PVC tubing bailer. Sufficient sample was collected from the borings to fill three 40'ml EPA-approved volatile organic ` analysis (VOA) vials containing 0.5 ml 18% hydrochloric acid as a sample preservative. Ground water sample containers were labeled with probe boring designation,depth,date,time,and sampler's initials.The preserved samples were logged on a chain-of-custody form,placed in a chilled container I and transported to CTEL for analysis. k EQUIPMENT DECONTAMINATION , i Prior to sample collection,the Geoprobe soil and ground water sampling equipment and probe rods were washed with a solution of Alconox and triple rinsed with'clean water. i - ANALYTICAL METHODS The soil samples were transported under chain-of-custody to Cal Tech Environmental Laboratories (CTEL), a California Department of Health Services-certified laboratory, for analysis for: V_ • Total petroleum hydrocarbons quantified as hydraulic oil'(TPH-ho)in accordance with EPA Method 8015M; • Poly-chlorinated bi-phenols (PCBs) in accordance with EPA Method 8082; • Total recoverable petroleum hydrocarbon(TRPH) in accordance with EPA Method 418.1; i • Carbon Chains in accordance with EPA Method 8015. II Each grab ground water sample was analyzed for: • TPH-g in.accordance with EPA Method 8015 Modified { • BTEX in accordance with EPA Method 8260; and 4 ii • Fuel additives including MTBE, TBA, DIPE, ETBE, TAME, methanol, ethanol, EDB and 1,2-DCA by EPA Method 8260B. i c Advanced GeoEnvironmental,Inc.