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Former Beacon Station No.1074 February 26. 2403 Stockton California Preliminary Results Report and Work Plan Addendum Inc. of Martinez, California (license #C57-656407) was retained to provide groundwater sampling and CPT logging services. Underground Service Alert was contacted on October 1, 2002 for locating underground utilities. The fieldwork for the preliminary phase of the additional subsurface investigation was conducted on October 8, 2002. Locations of the CPT-log boring (CPT-1) and soil borings (13-5 through B-8) are shown on Figure 2. The CPT-log boring was advanced to 130 feet bsg to obtain a log of the soil profile and a depth to groundwater. A pore-dissipation test was performed at approximately 65 feet bsg to evaluate the static groundwater level, A draft CPT log was generated at the site. , The hydropunch sampler was advanced to 130 feet bsg at two locations (soil borings B-5 and B-6), and to 100 feet and 130 feet at two additional locations (soil borings B-7 and B-8) for collection of groundwater samples. The groundwater sampler was typically driven to the target depth and retracted approximately 4 feet to expose the hydropunch screen. All CPT • borings were backfilled with cement. Groundwater samples were recovered with a decontaminated, stainless steel bailer lowered through the drive rods into the sampler screened interval. The recovered samples were decanted into prepared sample containers. The groundwater samples were placed in a cooled ice chest for temporary storage and transport. The groundwater samples were submitted, under chain-of-custody (COC) documentation, to Kiff Analytical LLC (Kiff) of Davis, California, a California Department of Health-certified laboratory (FLAP No. 2236). The samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg), the volatile aromatic compounds benzene, toluene, ethylbenzene and total xylenes (BTEX), the seven fuel oxygenates methyl-t-butyl ether (MTBE), diisopropyl ether (DIPE), ethyl-t-butyl ether (ETBE), ter -amyl methyl ether (TAME), tert-butanol (TBA), methanol, ethanol, and the lead-scavenger compounds 1,2-dichloroethane (DCA) and 1,2-dibromoethane (EDB) by Environmental Protection Agency Method 8260B. C:1Projects114 741141 W Padd n m2-03.doc Project No. 1474.14 3 HORIZON ENVIRONMENTAL INC.