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• • Fri, Dec 21, 2007 12:08 PM <br /> Subject: Work scope: Reinstall of MW-IID at New West Lodi (6437 West <br /> Banner Street, Lodi [Flag City]) <br /> Date: Friday, December 21, 2007 12:08 PM <br /> From: Ron Chinn <rchinn@closuresolutions.com> <br /> Conversation: Work scope: Reinstall of MW-11D at New West Lodi (6437 West Banner <br /> Street, Lodi [Flag City]) <br /> From: Roger Hoffinore <rhoffinore@closuresolutions.com> <br /> Date: Wed, 28 Nov 2007 13:58:18 -0800 <br /> To:Jim Barton <jbarton@waterboards.ca.gov>, Mike Infurna <minfurna@sjcehd.com> <br /> Conversation: Work scope: Reinstall of MW-11D at New West Lodi (6437 West Banner Street, <br /> Lodi [Flag City]) <br /> Subject: Work scope: Reinstall of MW-11D at New West Lodi (6437 West Banner Street, Lodi <br /> [Flag City]) <br /> Jim and Mike, <br /> As discussed by phone, we plan on performing the following work at the subject site on Friday <br /> 11/30/07: <br /> Groundwater monitoring well MW-10D, which has an obstruction at 15', will be drilled out to <br /> total depth and reinstalled. The work will be performed in accordance with both of the following <br /> documents: 1) Work Plan for the Installation of Additional Off-Site Groundwater Monitoring <br /> Wells and Soil Vapor Survey, dated July 16, 2007, and 2) the Work Plan for Additional Wells North <br /> of Site and Response to Regional Board Letter Dated 26 July 2007, dated August 23, 2007. The <br /> boring for well MW-1 OD will be drilled out to 10" diameter to ensure complete removal of the <br /> well material from the current construction prior to the re-installation of the well. "A-Rods" will <br /> be set in the casing during drilling to ensure that the augers stay on the original hole and that the <br /> well materials including the well casing are recovered. The well will be re-installed utilizing a 2" <br /> diameter schedule 40 PVC flush-thread casing to 90' below ground surface (bgs) with a screened <br /> interval (0.020" slot) from 80 to 90' bgs. A Monterey #3 sand, or equivalent, will be used as a filter <br /> pack from 95' up to approximately 78' (2' above the top of screen), this will be followed by a 2' <br /> bentonite seal followed by a neat cement grout tremied through the augers from the top of the <br /> bentonite at approximately 76' up to a traffic-rated, water-tight, flush-mounted well box. The well <br /> installation will be finished with a concrete collar around the well box. A locking cap will be <br /> secured to the top of casing within the well box. <br /> Regards, <br /> Roger <br /> Roger Hoffmore, P.G. <br /> Senior Geologist <br /> Closure Solutions, Inc. <br /> Page 1 of 2 <br />