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A Mr. Thomas Pinkos • <br /> September 15, 2004 <br /> Page 2 <br /> On September 10, 2004, ENSR was contacted by Mr. Barton and requested to submit recent <br /> soil and groundwater water samples for analysis of Cam 17 Metals, cations and anions to a <br /> California certified lab. Mr. Barton stated, "the requested analysis would help to determine if the <br /> soil is buffered". <br /> ENSR submitted one soil sample and one groundwater sample for analysis to a California <br /> certified laboratory on September 14, 2004. Upon receipt of analytical results, ENSR will <br /> provide copies of the analytical reports to the Board prior to October 1, 2004 and will include the <br /> results of the requested analyses in the Updated Site Conceptual Model, Monitoring and <br /> Remediation Status Report, Fourth Quarter 2004 scheduled to be submitted to your agency by <br /> January 15, 2004. <br /> Included in the Updated Site Conceptual Model, Monitoring, and Remediation Status Report, <br /> Fourth Quarter 2004 will be the conclusion on the most appropriate site remediation <br /> methodology to follow. This conclusion will be developed jointly with Jim Barton, Stone Bros. & <br /> Assoc. and GHH Engineering and evaluate if the soil and groundwater conditions at the site <br /> favor the use of the in situ chemical oxidation with ozone or Fenton's reagent or in situ bio- <br /> stimulation through the addition of ozone or hydrogen peroxide and nutrients to remediate the <br /> site. <br /> If you have any questions or concerns, please do not hesitate to contact me at (805) 781-2493. <br /> Sincerely, <br /> /John Frary <br /> Project Manager <br /> cc: Ms. Jill Tracy, Esq., Unocal, Brea <br /> Mr. Jim Barton, RWQCB - Central Valley Region <br /> Mr. Mike Infurna, San Joaquin County - Environmental Health Division <br /> Mr. Mark Owens, SWRCB - UST Cleanup Fund <br /> Mr. Ben Heningburg, ENSR International, Sacramento <br /> Mr. John Warren, ENSR International, Sacramento <br /> Mr. Gary Hall, GHH Engineering <br /> Mr. Jay Allen, Stone Bros. &Associates <br /> Real Estate and Remediation 276 Tank Farm Road San Luis Obispo,CA 93406 w .unooal.com <br />