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GEO-PHASE <br /> ENVIRONMENTAL <br /> WORK PLAN ADDENDUM <br /> PRELIMINARY ENDANGERMENT ASSESSMENT <br /> Former Haley Flying Service <br /> 21,000 Paradise Road, Tracy <br /> Cal-Site#39070037 <br /> April 21, 2006 <br /> GPE Project No.474.2 <br /> 1.0 INTRODUCTION <br /> Reference is made to our original Work Plan dated August 3, 2005, and the subsequent <br /> Preliminary Endangerment Assessment (PEA) dated January 18, 2006. The PEA identified <br /> the presence of significant pesticide contamination in the shallow soil in an area near the east <br /> end of the subject site. Two grab groundwater samples collected during the original <br /> assessment contained detectable concentrations of various pesticides. These sample results <br /> were, however, not considered definitive due to suspected cross-contamination of the <br /> sampling equipment from the high concentrations of pesticides in the shallow soil. <br /> Sub-sections 1.1, 1.2, and 1.3 of the original Work Plan provide a site description, the <br /> background, and status of the Haley site. Section 5 of the PEA describes the sample results <br /> of soil and groundwater samples collected to date. <br /> 1.1 Scope of Additional Work <br /> This Addendum describes a series of 6 Geo-Probe soil borings that will be installed in the <br /> vicinity of the former chemical mixing and loading area, and the adjacent washout pit. <br /> Groundwater samples will be collected from the borings and from the on-site domestic water <br /> well (see Figure 2 for boring locations). The samples will be tested for the possible presence <br /> of organo-chlorine pesticides. <br /> 2937 Veneman Avenue, Suite B240 Geo-Phase Environmental Inc. Phone: (209) 569-0293 <br /> Modesto, Ca 95356 Fax: (209)569-0295 <br />