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/Azsm <br /> GEOMATRIX <br /> RESULTS OF ADDITIONAL SOIL AND GROUNDWATER <br /> INVESTIGATIONS AND REQUEST FOR SITE CLOSURE <br /> Hanson Property <br /> 7750 Schulte Road <br /> Tracy, California <br /> EXECUTIVE SUMMARY <br /> Geomatrix Consultants, Inc. (Geomatrix) has prepared this report summarizing the results of <br /> additional soil and groundwater investigations performed on behalf of Chevron Pipe Line <br /> Company(CPL) at the Hanson Property at 7750 West Schulte Road in Tracy, California. <br /> These additional soil and groundwater assessments were requested verbally of CPL by the San <br /> Joaquin County Public Health Services, Environmental Health Division(PHS-EHD) on 3 <br /> March 1997 and were conducted in accordance with a 12 March 1997 letter/work plan from <br /> CPL to PHS-EHD. These investigations were conducted to evaluate the presence of petroleum <br /> hydrocarbons in the subsurface adjacent to CPL'S former Wait-Mendota-Richmond Pipeline <br /> ("Old Valley Pipeline"), located adjacent to the north Hanson Property boundary. Results of <br /> this investigation indicate that soil and shallow groundwater beneath the site have not been <br /> impacted by petroleum hydrocarbons associated with the former Old Valley Pipeline. Based on <br /> the results of this investigation, Geomatrix recommends that the Hanson Property be closed by <br /> PHS-EHD. <br /> 1AWPD0CS\4097\ADDLDWB.D0C ES-1 <br />