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05/27/2004 16:34 5306765 STRATUS NO CALF, PAGE 03/04 <br /> Mr.Nuel Henderson,Jr, May 27,2004 <br /> ARCO Station 6100 Project No.U 6100 <br /> Work Plan Addendum <br /> Page 2 <br /> (approximately 104 feet bgs) was generally similar to groundwater levels historically measured <br /> in well MW-1 (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-43/MW-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 /> 5TtPA7'LIS ENVIRONMENTAL, INC. <br /> Sc7744ottG.Bittinger,.R.G. ay !g <br /> Project Geologist Pr jec <br /> Attachments: figure 1 Site Plan <br /> cc: Mr. Paul Supple, Atlantic Richfield Company <br /> P1Bp•Arw for 11RS16100\Work PlansW 100 Work pian addeadum.doc <br />