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• CPT Investigation Work Plan <br /> BP Oil Site No 11193 <br /> C A M B R I A Stockton, California <br /> August 12, 1999 <br /> PROPOSED SCOPE OF WORK <br /> CPT Investigation <br /> Utility Location The proposed sampling locations will be marked and Underground Service Alert <br /> will be notified of our site activities to identify utilities in the site vicinity In addition, as-built <br /> diagrams will be requested from TOSCO to ensure the absence of subsurface obstructions in the <br /> vicinity of the proposed drilling locations <br /> Site Health and Safety Plan A comprehensive site safety plan will be prepared to protect site <br /> workers The plan will be kept on site during field activities and signed by each site worker <br /> Permits Drilling permits will be acquired from the SJCEHD <br /> Soil and Groundwater Sampling Six soil borings will be advanced to approximately 30 feet bgs <br /> using a cone penetration test ng(see Figure 2) Soil samples will be collected at five foot intervals <br /> Discrete-depth grab groundwater samples will be collected during soil sampling activities between <br /> approximately 16-18 feet bgs and at the bottom of each boring(see Appendix B) The water samples <br /> will be collected using a Hydropunch or equivalent device (see Appendix B) <br /> Field screening of hydrocarbons will include visual or olfactory observations, and/or portable volatile <br /> vapor analyzer readings The initial boring will be located adjacent to the tanks The borings will <br /> continue beyond 30 feet bgs if field screening suggests the presence of hydrocarbons Subsequent <br /> borings will be advanced to the completion depth of the initial boring Following completion, each <br /> boring will be sealed to surface with bentonite-cement grout <br /> CPT Sounding Two borings will be advanced to log soil types using CPT resistance and friction <br /> measurements The borings will be advanced to 30 feet bgs, or the completion depth of the soil <br /> borings The CPT soundings will be compared to the soil types encountered in the soil bonngs <br /> Following completion, each boring will be sealed to surface with bentonite-cement grout <br /> Chemical Analysis Selected soil samples from each boring will be analyzed for GRO by modified <br /> EPA Method 8015, and benzene, toluene,ethylbenzene,xylenes (BTEX), MTBE and TAME by EPA <br /> Method 8260 at a California-certified laboratory In addition, selected samples will be analyzed for <br /> total organic carbon using the Walkley-Black Method <br /> 4 <br />