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Additional Soil and Groundwater Investigation Work Plan-Addendum <br /> CCT Stockton Rail Yard, 1645 Cherokee Lane,Stockton,California <br /> December 17, 2007 <br /> Page 3 <br /> The revised boring location is shown on Figure 5, Attachment 1. <br /> SJCEHD Comment 3, Paragraph 7: <br /> One boring must also be located near the western margin of the excavation. <br /> TRC Response: <br /> As mentioned above, TRC adjusted the location of one boring locations to the western edge of the <br /> excavation boundary, where WWCSF-78 was presumably located(Figure 5,Attachment 1). <br /> DRILLING METHOD <br /> SJCEHD Paragraph 8: <br /> Please proceed with submittal of a brief addendum to the work plan stating what drilling method <br /> you intend to use. <br /> TRC Response: <br /> Due to the difficult drilling that has been encountered at the site in the past, TRC plans to use a <br /> sonic drilling rig to complete this scope of work. However, a drilling subcontractor has not yet been <br /> selected for this job. <br /> If you have any questions regarding this work plan addendum, please call Keith Woodburne at (925) <br /> 688-2488. <br /> Sincerely, <br /> Rachelle Dunn Keith Woodburne, P.G. <br /> Senior Staff Geologist Senior Project Manager <br /> Attachments: .��RED GFO <br /> Attachment 1 — Revised Figures 4 and 5 �� ���L O� <br /> Attachment 2 — Historical Laboratory Analytical Report * DBUq CP <br /> (P. No• 7607 <br /> cc: Dave Buccolo, CCT 90 O oQ��P <br /> Matt Graham, BNSF CALIF <br />