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Mike Infurna [EH] <br /> From: Ron Chinn [rchinn@closuresolutions.com] <br /> Sent: Thursday, September 13, 2007 9:27 AM <br /> To: Mike Infurna [EH] <br /> Cc: Jim Barton; Roger Hoffmore; Shannon Couch <br /> Subject: Re: New West MW construction <br /> Attachments: DTSC Vapor Sampling Protocol.pdf <br /> DTSC Vapor <br /> ampling Protocol.p. <br /> Hi Mike, <br /> Thanks for working on the permits for us. I'm happy to address your comments and <br /> questions as best we can. <br /> First of all, regarding the issue of the cement grout between the screens of dual <br /> completion wells, we are happy to move forward with time release bentonite pellets instead <br /> of neat cement. We already notified the drilling contractor of the change in well <br /> construction, and will be proceeding with this unless otherwise directed by your office. <br /> I asked Jim Barton if he needed a revised well construction diagram indicating the change <br /> of material between the wells, and he stated that an e-mail acknowledgement would be <br /> sufficient for the file, and that revision of the diagram would not be necessary. <br /> Second, regarding the issue of the vapor borings, perhaps there was some miscommunication <br /> of the protocol: the vapor borings will only be open for a maximum of two hours. We <br /> intend on following the DTSC Vapor Sampling Procedure (attached) . We expect that the <br /> vapor sampling will take only 30 to 60 minutes per location, however to be conservative, <br /> we'll assume that it will take up to two hours. Once the vapor sample is collected, the <br /> vapor probe will be pulled out, and the boring backfilled with bentonite. The top of the <br /> boring will be matched to the existing surface, which is either asphalt or concrete <br /> depending upon location. I admit that we did NOT include a boring completion diagram, <br /> simply because the final product would essentially show a just bentonite plug. When I <br /> discussed this with Jim Barton this morning, he agreed that that diagram would probably <br /> not be meaningful, however if you wish, we will produce it for you. <br /> Again, I sincerely appreciate your work on these permits, and would like to reiterate that <br /> we are happy to do whatever you need us to do out there. For example, if you aren't <br /> comfortable with a bentonite plug to seal the vapor borings, we could remove the bentonite <br /> upon completion of vapor sampling, and backfill the hole with neat cement. Personally, I <br /> don't see the point, but I fully recognize that this isn't my call, it's yours. <br /> Please give me a call or send me an e-mail if you have any further questions. <br /> Thanks, <br /> --Ron <br /> Ronald D. Chinn, P.E. <br /> Principal Engineer <br /> Closure Solutions, Inc. <br /> 1243 Oak Knoll Drive <br /> Concord, California 94521 <br /> Phone: (925) 429-5555 <br /> Fax: (925) 459-5602 <br /> On 9/13/07 8:10 AM, "Jim Barton" <jbarton@waterboards.ca.gov> wrote: <br /> > Hi Ron, <br /> 1 <br />