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Mike Infurna [EH] <br /> From: John A Izbicki Daizbick@usgs.gov] <br /> Sent: Wednesday, April 05, 2006 1:20 PM <br /> To: Mike Infurna [EH] <br /> Subject: RE: test test <br /> Im <br /> well_design.pdf centralizersJpg <br /> Hi Mike-- <br /> I think that this proposed well design conforms to your requirements for <br /> the permit for the Atherton and Sandman Park wells. Note that the wells <br /> will be installed with tension from the rig to hole them straight in the <br /> hole. We do the to ensure our pumps and geophysical tools can move through <br /> the well. <br /> (See attached file: well_design.pdf) <br /> We plan on using this centralizer at the bottom of the well to ensure a <br /> central location within the borehole. <br /> (See attached file: central izers.jpg) <br /> These centralizers will be used farther up the well to keep the wells off <br /> the borehole wall and seperated from each other. We can fabricate a <br /> centralizer having less open area if you require it, but I thought that you <br /> may be more confortable with a commercially available product. <br /> http://kwlkzip.com/ (click on products) <br /> I have talked with our driller and he is comfortable that he can built <br /> this. Are you comfortable with the use of the 30% solids sodium bentonite <br /> grout in this environment given our expected chloride concentrations? I <br /> have data from wells we have installed in saline (seawater concentrations) <br /> that a preforming well after almost 20 years of service. <br /> Let me know what you think and if you need more information. <br /> Thanks <br /> John Izbicki <br /> (619) 225-6131 <br />