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Page 1 of 2 <br /> Mike Infurna [EH] <br /> From: Mike Infurna [EH] <br /> Sent: Thursday, April 17, 2008 8:11 AM <br /> To: 'Tim Cuellar' <br /> Subject: RE: FC <br /> Attachments: overbore diagram Scanned_.pdf <br /> I'm not worrying about going off the hole or off center, I'm worried that a 12-inch auger won't REACH the <br /> outside/grout/sand/bentonite on the OTHER side of the hole when the auger is centered on a casing off center of <br /> the original borehole. <br /> take a GOOD look at this attached diagram.A'downward'view from the surface looking into a well box where two <br /> PVC casings (nested) are inside a 10-inch grout. <br /> first notice, TWO PVC casings and how either one is NOT in the center of the grout, as required to maintain a <br /> NLT 2-inch grout annulus between each casing and the dirt borehole wall. <br /> I've added some scaled dimensions. If you look closely you'll see IN BETWEEN the two casings is a mark, "CP", <br /> as in center point of the original drill-10-inch bore. Now look to the left, let's call this casing the DEEP one. Now if <br /> you center a 12-inch auger on this with the intention to drill to TD, you'll see by the marks and lines below the <br /> casings I've placed that 5-inches to the right(the radius of a 10-inch auger)falls not quite THRU the right casing, <br /> and DOES NOT reach out to the extreme right where the original 10-inch borehole and current grout is. Over <br /> boring requires 'removing ALL the contents from the hole". <br /> But a 14-inch auger does, but there are no 14-inch augers. Next step up is a 15-inch.. <br /> a 12-inch auger falls less than an inch past the right casing and it TOO doesn't reach the outside of the original <br /> borehole. <br /> clear as mud <br /> From: Tim Cuellar [mailto:tcuellar@advgeoenv.com] <br /> Sent: Wednesday, April 16, 2008 4:33 PM <br /> To: Mike Infurna [EH] <br /> Subject: RE: FC <br /> Mike, <br /> We just got off the phone. And you said we had to use 15-inch augers to destroy MW-6 (a and b). <br /> If I have Eddie insert drill rods inside both casings (A and B), can he use 12-inch augers? I'm only <br /> asking because 15-inch augers are a pain to work with, and Eddie doesn't have 15's. <br /> Thanks - Tim <br /> 4/18/2008 <br />