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Message Page 4 of 8 <br /> Jeff, <br /> The reason for the 2 foot auger is that we wanted to <br /> break out the existing grout and remove all of the <br /> sand packing. If you think still that is an overkill <br /> please advise. How about a cement/sand slurry? <br /> Thanks, <br /> Bob <br /> -----Original Message----- <br /> From: Jeff Wong [EH] <br /> [ma iIto:Jwong@sjcehd.com] <br /> Sent: February 06, 2004 2:15 PM <br /> To: Noyes, Bob/SAC <br /> Subject: RE: Re drilling well MW-10 at <br /> PG&E's Lathrop station <br /> Hey Bob: <br /> Everything is cool except for the freefall. You <br /> must tremie grout if there's groundwater in the <br /> hole. Freefall is only allowed when it is less <br /> than 30 feet"and" dry. <br /> Isn't a 2-foot auger bit of an overall? Not that <br /> I'm going to stand in your way if you choose <br /> to use it. Now I don't remember the diameter <br /> of the well, but it couldn't be so big that <br /> requires a 2-foot auger. <br /> Also, EHD requires neat cement, or even <br /> bentonine slurry (unless there are <br /> solvents) for grouting. Although EHD does <br /> not prohibits concrete, but is concrete slurry <br /> such a good idea, since Concrete may cause <br /> problems for farmers and their equipments if <br /> they decided to work in that area in the <br /> future. In anycase, I'll leave that up to you. <br /> thanks, <br /> Jeff <br /> -----Original Message----- <br /> From: Bob.Noyes@ch2m.com <br /> [mailto:Bob.Noyes@ch2m.com] <br /> Sent: Friday, February 06, 2004 2:05 <br /> PM <br /> To: Jeff Wong [EH] <br /> Cc: Angelo.Franchitto@ch2m.com <br /> Subject: RE: Re drilling well MW-10 at <br /> PG&E's Lathrop station <br /> Importance: High <br /> Hi Jeff, <br /> So we are all on the same page, I am <br /> working out scope with Sacramento <br /> Drilling and their plan is to go in with a <br /> 2 foot auger and over drill the existing <br /> well down to 20 feet. They are then <br /> 2/13/2004 <br />