Laserfiche WebLink
The tubing twists, bends and corkscrews. <br /> We have tried over-boring the outside of the grout column, with large augers, but with limited success. <br /> Putting a 50 grain cord down the middle does not take out all seven chambers, usually you will get the center and one <br /> exterior chamber. <br /> Using this method,the cord is inserted into the middle chamber and then neat cement its used to fill all seven chambers <br /> prior to setting off the charge. <br /> This is then followed by over-drilling with large diameter augers. <br /> We have seen almost every possible combination for taking these out, except cryogenics, and all have had minimal <br /> success. <br /> Leaving them in the ground is not an option due to the tendency for the channels to cross-talk and run contamination <br /> from one level to another. <br /> At depths approaching 200', we have had almost no success on removing these,and have had some augers left in the <br /> ground from the attempt. <br /> This is not to say how you are to remove these wells, but over-drilling does not work and will not be permitted. <br /> Hopefully you can come up with a method that we have not tried that will allow you to remove all the contents of the <br /> well. <br /> Johnny Yoakum <br /> Senior REHS <br /> San Joaquin County <br /> Environmental Health Department <br /> From: Larry Witwer rmailto:larnm@)amiadini.com] <br /> Sent: Thursday, September 05, 2013 10:17 AM <br /> To: John Yoakum [EH] <br /> Subject: RE: 420 W Yosemite - Rainwater car wash <br /> John, <br /> Yes, we are also required by the State to abandon the seven continuous multichamber tubing (CMT) wells <br /> MW-7 A-F through MW-13 A-F. We will be submitting a permit application to your office when the time comes <br /> to proceed with this work. I was curious about the "explosive demolition" method you referred to. The CMT <br /> wells consist of a 1.7" OD polyethylene tubing assembly, which is segmented into seven channels. See <br /> attached technical brochure for details. We would expect that this plastic tubing assembly could be abandoned <br /> by overdrilling with an HSA type drill rig, wherein the auger would cut-up and remove the well casing/tubing <br /> assembly along with the sand pack and seals as it was advanced into the existing borehole. <br /> If you could elaborate on the need and procedures for explosive demolition to abandon the wells, it would be <br /> much appreciated. <br /> We will keep you appraised on the progress of this case as we move forward. <br /> Regards, <br /> &X <br /> 3 <br />