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• Page 5 of 11 <br /> well qualifies for pressure grout. These wells are to have the contents <br /> removed also. <br /> Please submit a revised list of wells that includes the above noted <br /> modifications. After I have received and approved the list, you will be <br /> notified to submit SJCEHD Well Permit Applications, Master File Record <br /> forms, and fees. <br /> As a precaution, please check with your drilling contractor and see what <br /> steps and materials will be needed and used to ensure that the augers or <br /> drill casings will stay centered on the small diameter casings during the drill <br /> out procedures. Recently, problems have developed at other sites where <br /> three-quarter and one-inch PVC casings were scheduled to be drilled out. <br /> The driller had no way to stay centered during drilling and the augers went <br /> off-center within the first 5-10 feet. I stopped the drilling/destruction process <br /> until they could provide an adequate method of staying on-center and <br /> removing the contents of the well. The only method that was successful for <br /> this site was using very large augers (15-inch outer diameter) with a 11- <br /> inch inner diameter that encompassed the hardened 8-inch grout of the <br /> well to be destroyed and provided a self-centering way to reach total <br /> depth. The 15-inch augers were left in place and smaller augers (6 or 8- <br /> inch) were then used to drill inside the large augers and remove the <br /> contents of the well. Very labor intensive and time consuming and not a <br /> procedure I recommend initially, but was used after multiple field attempts <br /> to drill out these small wells failed. I recommend you have a Plan B in case <br /> the primary method you chose fails to meet the destruction objective of <br /> removing the contents. <br /> Thank you in advance for your cooperation. You may contact me at 209- <br /> 468-3454 if you have any questions. <br /> Michael Infurna, Senior REHS <br /> SJCEHD <br /> From: Evans, Brenda [ma ilto:Brenda.Eva ns@aecom.com] <br /> Sent: Monday, October 03, 2011 11:54 AM <br /> To: Jim Barton <br /> Cc: McKenna, Stephanie; BORGIOTTI, SERGIO I; ngleason@DowneyBrand.com; <br /> jayallenl@att.net; Jim Brake; Josh Ewert; Mike Infurna [EH] <br /> Subject: 5400 and 5606 Pacific Avenue, Stockton - Well Destruction Information <br /> Good Morning, Jim: <br /> 11/7/2011 <br />