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GEOTHASE <br /> ENVIRONMENTAL <br /> June 23, 2006 <br /> Mr. Eric Wallberg <br /> California Department of Toxic Substance Control <br /> 8800 Cal Center Drive <br /> Sacramento, CA 95826 <br /> RE: REPORT—ADDENDUM TO PRELIMINARY ENDANGERMENT ASSESSMENT <br /> Former Haley Flying Service,21,000 Paradise Road,Tracy <br /> (Cal-Site#39070037) <br /> Mr. Wallberg: <br /> The attached report is an addendum to the original PEA, dated January 18, 2006 and submitted <br /> on behalf of Mrs. Dorothy Haley, the owner of the subject site, formerly operated as a crop- <br /> dusting service. The site is listed on the DTSC "Cal-Site" database. The purpose of this <br /> addendum is to assess groundwater conditions in the vicinity of the pesticide soil contamination <br /> documented in the original PEA. <br /> Sincerely, <br /> /00 <br /> 4 <br /> Geo-Phase nvironmental Inc. <br /> Stephen M. Lankford, PG, REA <br /> President <br /> cc: Dorothy Haley <br /> Ryan Voorhees <br /> San Joaquin County EHD <br /> 2937 Veneman Avenue,Suite B240 Geo-Phase Environmental Inc. Phone: (209)569-0293 <br /> Modesto,Ca 95356 Fax: (209)569-0295 <br />