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RECEIvEo <br /> laboratories DEC 0 7 2900 <br /> --- <br /> December 7,2400 <br /> Ground Zero Analysis <br /> Attn Greg Stahl <br /> 1714 Main Street <br /> Escalon, CA 95320 <br /> Subject Knowles Roek Protect <br /> ' EDB Report on sample KR VW-1 <br /> ' Dear Mr Stahl <br /> This laboratory analyzed samples for the above mentioned project back on 12/04/00 One of the analysis involved was <br /> Oxygenates by method 821011 After the analysis of the samples and data review, the EDB result of 1,200 ug1L on sample <br /> KR VW-1 caught my attention,not only because of the high concentration,but because I rarely have seen this compound <br /> detected before Because of that, it prompted me to investigate prior analyses of that same sample that have been performed <br /> at our facility After reviewing the analytical data from the August,2000 sampling event of this same project, I found that EDB <br /> ' was detected on that same sample(well)at a concentration of 490 uglL However,when the report was generated, it was <br /> incorrectly reported as ND(not detected)at an elevated reporting limit due to dilution factors Apparently we made an <br /> interpretation mistake at the time the data was reviewed and consequently reported <br /> I apologize for any inconvenience that this may have caused We would like to assure you that we are taking steps to make <br /> sure that a mistake like that does not happen again If you have any additional questions, please feel free to contact me at <br /> (209)581-9280 <br /> i <br /> Sincerely, <br /> i <br /> Hiram ueto <br /> ' Lab Director <br /> Argon Labs <br /> ' 3037 Fpkh St, Ceres, CA 95307 • Phone (209) 581-9480 • Fax (209) 581-9282 <br />