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Mr.M. Scott Mansholt—CEMC Soil Sampling Work Plan August 1,2006 Surland Homes Property Page 5 of 8 ' The requested non-carcinogenic Cal/EPA and EPA toxicity values will be used in the risk assessment developed for the site. S. Calculations. Some calculations are reported to be non reproducible. Given the change in the exposure pathways as outlined in the current SCM relative to the exposure pathways contemplated in the HRSE prepared by Geomatrix, it is likely that the existing ' calculations will be re-evaluated. 6. Groundwater(Naphthalene and phenanthrene). The grab groundwater analytical data for naphthalene and phenanthrene were not included in the HRSE. ' As contact with groundwater has been eliminated as an exposure pathway, groundwater samples are not proposed as part of the sampling program. ' 7.Metals. Metals were not included in the HRSE. No metals data were collected from petroleum impacted soil or groundwater. CEMC has demonstrated that heavy metals related to crude oil transported in the pipeline are not ' a concern, and risk analysis for heavy metals is not required. Metals will therefore not be tested in future samples from the site. This approach has been outlined in the CTA(Geomatrix, February 2005),and is currently accepted by the lead agency for the CEMC historical pipeline projects. 8.Ecological Screening Risk Evaluation. Ecological Screening Risk Evaluation is required for this site. ' An Ecological Screening Risk Evaluation will be developed for the site. ' OBJECTIVE AND SCOPE The following scope of work includes prefield activities, on-site soil sampling, and report preparation tasks. ' PERMITTING AND ACCESS Prior to initiating field activities,boring installation permits will be obtained from the San Joaquin County Division of Environment Health(SJCDEH), and access agreements will be obtained from UPRR by CEMC. Prior to field activities,the proposed boring locations will be marked, Underground Service Alert will be notified for underground utility clearance, and a private utility locator will be retained to screen for the potential presence of subsurface utilities. A job safety assessment will be conducted and a site-specific health and safety plan will be prepared and reviewed for proposed site activities. SOIL SAMPLING SAIC will contract a California-licensed(C-57) driller to operate truck-mounted GeoProbe direct- push equipment or hand-auger equipment and advance the proposed seven shallow boreholes. As t shown on Figure 2,three borings are located along the northern edge of the UPRR alignment and four are located along the southern edge, in the vicinity of the former OVP and TAOC pipelines. Soil cores will either be obtained using a core barrel sampler, which is approximately 4 feet long ' and 2 inches in diameter, or from a slide hammer containing a 2-inch by 6-inch brass sleeve. The core barrel sampler contains a plastic acetate liner that retains a relatively undisturbed soil core from which soil samples are collected. Soil samples will be collected from near surface soil ' (approximately 1 foot bgs)and from just above groundwater(anticipated to be 5 to 7 feet bgs). The acetate liner or brass sleeve for soil samples selected for analysis will be sealed with Teflon 1