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Page I of <br /> Mike Infurna [EH] <br /> From : Mike Infurna [EH] <br /> Sent: Tuesday, February 27, 2007 2:50 PM <br /> To: 'evans60@atcassociates.com' <br /> Subject: RE: Work Plan Submittal : King Island Resort - Eight Mile Road , Stockton, CA <br /> Thanks . . <br /> David , <br /> I'm confused with your "ATTACHMENT 3" . . . <br /> Why TWO conductor casings (CC) ??? Very difficult to really do well (centralize) in the field NOT using mud <br /> rotary and grouting is very difficult. Why not one long one? That's ok fine with me. We do just one CC all the <br /> time. I just put in a 125 footer last month . Using a continuous drill operation (no stopping overnight from TD of <br /> large hole to CC grout), cross contamination can be mostly and adequately eliminated . If you're planning on <br /> obtaining soil samples , like proposed, may I recommend a pre-drill with a 8-inch augers to get your samples. <br /> After you have your samples, then ream out the borehole with a larger auger. This is where the problem begins <br /> usually. <br /> Some program managers do the math and the drawings and it all looks peachy-keano in the work plan . The <br /> problem shows its ugly head in the field with the drillers and the procedural steps that don't work because of the <br /> ID OD clearances. If YOU do the math, the 8 .625inch OD steel 'should' fit inside a 12.75 OD auger with an ID of <br /> the same . . . but drilling thru the ID of the steel to set the PVC won't work. flinch augers typically have 'hardener' <br /> layers welded to the flight tips. This produces a 9 inch hole . These auger will NOT fit down the CC. so how do <br /> you drill out thru the CC to place the PVC? Most drillers use 15inch augers to place the 8 .625inch steel . Allows <br /> plenty of room for construction/placement. Either way, 12+-inch or 15inch augers , ream out the 'soil-sampling- <br /> borehole' with a wood plug installed and continuously drill/ream to TD for the CC . Install the CC inside the 12/or <br /> 15-inch auger and you're set. (I'll need to know length of pipes you plan to use and HOW attached to each <br /> other) The 8-inch steel CC will centralize itself inside the augers and even push out the wood plug if need be. <br /> You can then 'free-fall' the cement grout (though the augers are really a tremie) from the surface and withdraw the <br /> big augers as you grout. VIOLAIII . Your CC is installed in one day. Comments? Did I miss something??? The <br /> grout must be left un-molested for 12 to 48 hours, depending on the ASTM Type Cement your drillers use. Type <br /> II/V is used a lot out there. Bulletin 74-90 claims Type II is 24 hour setup time and Type V is 6 hours. I typically <br /> recommend STRONGLY that we wait 24 hours before drilling inside a newly installed/grouted CC. <br /> Same with ATTACHMENT 2 . You can 8-inch pre-drill to get soil samples at depths of concern to you . Then use <br /> the larger augers to ream out the hole, set the steel and grout the CC . <br /> Again , am I missing something here? <br /> From: David Evans [mailto:evans60@atcassociatesocom] <br /> Sent: Tuesday, February 27, 2007 12 :38 PM <br /> To: Mike Infurna [EH] <br /> Cc: Todd Hafner' ; 'Jeanne Homsey' <br /> Subject: FW: Work Plan Submittal : King Island Resort - Eight Mile Road, Stockton, CA <br /> I <br /> Mike , this was your " response" dated January 19 , 2007 . Look forward to hearing from you <br /> soon . <br /> Best regards, Dave <br /> From: Mike Infurna [EH] [mailto: MInfurna@sjcehd .com] <br /> Sent: Monday, January 22, 2007 9 : 59 AM <br /> 2/27/2007 <br />