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Mr Michael Infurna <br /> August 23, 2005 <br /> Page 4 <br /> 1 <br /> EHD Page 2, paragraph 3, hne 7 "Additionally, how much dissolved oxygen is <br /> expected to escape the MW-1 well casing and get into the aquifer ground water, <br /> when it can be expected that most of the m)ected air will bubble straight up the <br />' well casing Are there calculated estimates of the dissolved oxygen diffusion rate <br /> from the well casing and the time it will take to detect this in the observation well, <br /> VEW-1;1 Determination of an adequate test duration time is dependent upon <br /> these site-specific estimates " <br /> BC: One of the primary objectives of the AS pilot test is to determine <br />' breakthrough and sustained pressure at the test well, in order to properly size the <br /> remediation equipment As in any air sparge well,whether it be a temporary well <br /> for pilot testing or a point explicit in its purpose, air will first fill the well casing <br /> volume In our experience, pilot testing gives practical data that we can then use <br /> to design and size the remediation system appropriately—if at all We have <br /> designed the pilot test duration to accommodate the financial resources available <br /> As discussed above, the outcome of the pilot test will be detailed technical <br /> responses to the County's concerns Finally, although the technology mandates a <br /> relatively long-screened well, there will be no cross contamination <br /> If you have any questions or comments, please call me at (916) 853-5316 <br /> Sincerely, ED GEO <br /> BROWN AND \ �'q <br /> No. 6893 <br /> A � <br /> Tina M Bauer, <br /> Project Manager OF <br /> TMB ds <br /> Enclosures <br /> 1 cc Mr J L Barton, Central Valley Regional Water Quality Control Board <br /> Mr Terry Tarchti,T&T Trucking, Inc <br /> Mr Mark Owens, State UST Cleanup Fund <br /> P\28(100\128253-T&I 1 ruck1ng SVL\5]C RL%ponsc doc <br />