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tt ll <br /> C A M B R I A <br /> • Groundwater samples from borings CPT-2 and CPT-3, located near the eastern property <br /> boundary, contained petroleum hydrocarbons, suggesting that off-site lateral investigation at <br /> the adjacent property to the east is warranted. <br /> • The deepest groundwater sample from boring CPT-4 contained TPHg and benzene at <br /> concentrations of 1,320 and 13.8 ppb, respectively. Further assessment of the vertical extent <br /> of petroleum hydrocarbons near the existing UST area is warranted. <br /> • Cambria proposes drilling one deeper CPT boring (CPT-5) adjacent to CPT-4 to assess the <br /> vertical extent of petroleum hydrocarbons in groundwater and six additional CPT borings <br /> (CPT-6 through CPT-11) to assess the lateral extent of petroleum constituents in <br /> groundwater. The proposed boring locations are shown on Figure 2. <br /> Work Tasks <br /> Permits: Cambria will obtain a drilling permit from SJCPHS/EHD. Cambria will pursue an <br /> access agreement, on behalf of Equilon Enterprises LLC (Equilon), with the owner(s) of the <br /> adjacent property to the east of the subject site. <br /> 'Site Safety Plan: Cambria will prepare a Site Safety Plan for field work. <br /> Utility Clearance: Cambria will mark proposed drilling locations and will clear the locations <br /> through Underground Service Alert prior to drilling. <br /> Site Investigation: Seven exploratory CPT soil borings (CPT-5 through CPT-11)are proposed at <br /> the locations shown on Figure 2. The purpose of boring CPT-5 is to further assess the vertical <br /> extent of impacted soil and groundwater adjacent to the UST complex, and the purpose of <br /> borings CPT-6 through CPT-11 is to assess lateral extent of impacted groundwater identified in <br /> the previous investigation. Proposed boring CPT-5 will be located adjacent.to the USTs and will <br /> be advanced to 100 fbg, if possible. Proposed borings CPT-6-through CPT-9 are located near the <br /> subject site's southern, western, and northern property boundaries, and proposed borings CPT-10 <br /> and CPT-11 are located east of the site, on a property occupied by a Best Western Motel. These <br /> borings will be:advanced to 85 fbg. <br /> A Cambria geologist will supervise the drilling, and encountered soils will be logged <br /> continuously in all the borings using electronic CPT equipment. Soil samples will be collected <br /> from boring CPT-5 at five-foot intervals beginning at 85 fbg for possible chemical analyses and <br /> 0778 3 <br />