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GEOMATRIX Mr. M. Scott Mansholt Mr. James Levy June 30, 2005 Page 3 Several borings (GMX-24 and GMX-31 through GMX-33) are planned to assess whether residual metals may be associated with the former rail road spur that crossed the site. The two shallow soil samples from each of these borings will be analyzed for Title 22 Metals (using EPA Method 6020). Grab groundwater samples will be collected from borings GMX-24 through GMX-29. Boring GMX-27 will be advanced within the known areas of impacted soil to assess whether groundwater has been impacted with petroleum hydrocarbons. Borings GMX-24 through GMX-26, and GMX-28 and GMX-29 will advanced in locations that encircle the area of known petroleum hydrocarbon affected soil. A groundwater sample will be collected fol- lowing installation of a temporary well consisting of 1-inch-diameter polyvinyl chloride (PVC)blank casing and 5 feet of 0.01-inch slot well screen. Each groundwater sample will be collected using a disposable bailer and will be decanted into the appropriate containers provided by the laboratory. Grab groundwater samples will be analyzed for TPH quantified as gasoline (TPHg) and TPHd using EPA Method 8015M,volatile organic compounds (VOCs) using EPA Method 8260, and PAHs using EPA Method 8270 SIM. TPHd analyses will be performed both with and without a silica gel preparation procedure. If separate phase hydrocarbons are observed in the soil core near the water table, a grab groundwater sample will not be collected. Soil and groundwater samples will be labeled and stored in an ice-cooled chest until transfer to a California-certified laboratory under Geomatrix chain-of-custody procedures. All bor- ings will be grouted to ground surface using a tremie pipe upon completion. Investigation derived waste will be placed in containers, labeled, and temporarily stored at the site pending disposal by CEMC and UPRR. Several samples will be submitted to the laboratory for quality assurance/quality control (QA/QC) purposes. One travel blank, provided by the laboratory,will accompany grab groundwater sample containers throughout the trip from the laboratory to the field and back to the laboratory. The travel blank will be analyzed for TPHg and BTEX. One equipment blank will be collected using a disposable bailer. The equipment blank will be submitted to the laboratory, however, it will only be analyzed if there is a question regarding the results of the grab groundwater samples. One soil sample will be specified for matrix spike/matrix spike duplicate analysis for TPHd, TPHmo, BTEX, and PAHs. After analytical results have been received, Geomatrix will prepare a report documenting field activities, and analytical results. The report will include a description of field and analytical methods, tables and figures presenting analytical results, and a discussion of the results.