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05/27/2004 16:33 530676 STRATUS NO CALIF PAGE 03/04 <br /> Mr.Nuel Henderson,Jr. May 27,2004 <br /> ARCO Station 6100 Project No.U 6100 <br /> Work Plan Addendum <br /> Pagc 2 <br /> (approximately 104 feet bgs) was generally similar to groundwater levels historically measured <br /> in well MW-I (approximately 105 feet bgs). <br /> Given that the objective of the well installations was to monitor groundwater beneath and <br /> adjacent to the site, Stratus is recommending that the location of the replacement well borings be <br /> moved in the southwestern direction from the B-43/MW-11 work area, closer to the area where <br /> groundwater has been observed. If our understanding of the site geology and distribution of <br /> groundwater is correct, advancement of replacement wells in the northeastern direction from <br /> B-431MW-11 would be more likely to result in the completion of dry wells than the advancement <br /> of well borings in the southwestern direction from B-43/MW-11. <br /> If you have any questions regarding this document, please contact Jay Johnson at <br /> (530) 676-6000. <br /> Sincerely, <br /> 97-RA7719 EN11/90NMENML, NO <br /> sr ott G. Bittinger, R.G. ay on, R.G. <br /> Project Geologist Pr ject anager <br /> Attachments: Figure 1 Site Plan <br /> cc: Mr. Paul Supple,Atlantic Richfield Company <br /> P:Tp•Arw for UR5161001work Plans\6100-work plm adde dum.doc <br />