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i t <br /> w <br /> From Science to Solutions- <br /> HPP-BTR MP#204.1 <br /> US Can-Welty Road <br /> DCN:C20-SAI-Welty-Roa&US-Can-01-8981 <br /> February 10, 2006 <br /> Mr. M. Scott Mansholt <br /> Chevron Environmental Management Company <br /> 6001 Bollinger Canyon Road <br /> P.O.Box 6012 <br /> San Ramon, California 94583-0712 <br /> Subject: Revisions—Fourth Quarter 2005 Groundwater Monitoring and Sampling Report and <br /> 2005 Annual Summary <br /> US Can—Welty Road <br /> 35275 Welty Road <br /> Vernalis, California <br /> Dear Mr. Mansholt: <br /> In accordance with a conversation with the Regional Water Quality Control Board on January 17, 2006, <br /> Science Applications International Corporation has prepared the attached revisions to the Fourth Quarter <br /> 2005 Groundwater Monitoring and Sampling Report and 2005 Annual Summary for the US Can—Welty <br /> Road site. The revisions and reasons for the revisions are listed below. <br /> • Last paragraph of the Groundwater Analytical Results section: changed the wording to make the <br /> paragraph more understandable. Corrected the word"fluoranthene"to"flourene." <br /> • Last paragraph of the Annual Summary section: changed the wording to make the paragraph <br /> more understandable. <br /> • First paragraph of the Conclusions and Recommendations section: changed the wording to make <br /> the paragraph more understandable. <br /> • Figure 4: For MW-2, changed"Dibenzo(a,h)anthracene"to"Dibenz(a,h)anthracene" For MW-5, <br /> changed the 10/19/05 TPHd result from 24 to 240. Added the April 2005 analytical results for <br /> wells MW-2 and MW-3. <br /> If you have any questions regarding these revisions, please call me at(916) 979-3866. <br /> Sincerely, <br /> SCIENCE APPLICATIONS INTERNATIONAL CORPORATION OA G; <br /> CHRISTOPHER l <br /> Christopher B. Dennis,P.G. DENNIS <br /> Senior Geologist N0.7184 <br /> Enclosures: Op Cg0,F <br /> r <br /> Pages 5—7 <br /> Expires August 31 A- <br /> Figure 4: Petroleum Distribution in Groundwater During 2005 <br /> 3800 Watt Avenue,Suite#210, Sacramento, CA 95821(916)974-8800 'Fax:(916).979-3735 <br />