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i <br /> • <br /> ' 1.0 INTRODUCTION <br /> SECOR International Incorporated (SECOR) has prepared this report on behalf of <br /> ' ConocoPhillips to document the findings of vertical assessment and submit an Updated Site <br /> Conceptual Model for the site referenced above (Figure 1) The objective of this work was to <br /> delineate the vertical extent of petroleum hydrocarbons in groundwater at the site The scope of <br /> work consisted of the installation of two onsite sonic borings (dual hole) completed at depths of <br /> 120 feet below ground surface (bgs) This work was performed as described in SECOR's <br /> Addendum to Work Plan for Vertical Assessment, dated March 18, 2004, and in accordance <br /> ' with conditions stated in a San Joaquin County Environmental Health Department (SJCEHD) <br /> approval letter dated March 28, 2004 (Appendix A) <br /> 1 <br /> i <br /> 1 <br /> Updated SCM doc 1 August 13,2004 <br /> ' 77CP 64409 05 0005 <br />