Laserfiche WebLink
• • <br /> Mike Infurna [EH] <br /> From: Jim Barton Qbarton@waterboards.ca.gov] <br /> Sent: Tuesday, September 25, 2007 12:06 PM <br /> To: rchinn@closuresolutions.com <br /> Cc: rhoffmore@closuresolutions.com; martag@newwestpetroleum.com; Mike Infurna [EH]; <br /> James Munch <br /> Subject: Re: Flag City New West- Northern Wells <br /> Hi Ron, <br /> I appreciate the level of effort to install the wells per the workplan, in light of the <br /> difficulties encountered by the drillers and your staff. I told Roger that the reason for <br /> installing the northen wells, besides definition of the plume, was to watch for changes in <br /> the aquifer due to operations at the new municipal well to the northeast of the site, and <br /> to provide sentinel duty for the existing groundwater plume. While I originally approved <br /> the northen B-zone well at the New West station, the northern B-zone well at the <br /> neighboring Taco Bell may be adequate for now. <br /> If Closure Solutions is willing to provide a professional opinion with technical rationale <br /> and cross sections in the November report, that the current well network is adequate to <br /> determine lateral and vertical extent of the groundwater plume, then I will consider your <br /> request to skip the B-zone well at the station, but only after I review the report. If <br /> for some reason the current investigation does not adequately characterize the extent of <br /> the plume, then I would expect a recommendation for additional work in the report and a <br /> workplan to address the deficiencies in the next phase of the investigation, per Order #S <br /> of the CAO R5-2007-0709. <br /> Thanks. <br /> Jim Barton <br /> James L.L. Barton, P.G. <br /> Engineering Geologist <br /> California Regional Water Quality Control Board Central Valley Region, 11020 Sun Center <br /> Drive, Suite 200, Rancho Cordova, CA 95670 office (916) 464-4615 <br /> fax (916) 464-4704 <br /> >>> Ron Chinn <rchinn@closuresolutions.com> 9/25/2007 11:01 AM >>> <br /> Hi Jim, <br /> I understand that you spoke with Roger Hoffmore this morning about drilling the wells to <br /> the north of the Flag City New West and the Taco Bell, but for the record, I thought I'd <br /> send you an e-mail summarizing events thus far. <br /> We had some significant challenges drilling the wells to the north. <br /> Yesterday, as proposed, we proceeded with installation of the wells on the Flag City <br /> property as dual completion wells using a 12' diameter auger. <br /> Unfortunately, at approximately 27 feet, we encountered stiff resistance (silt w/ clay & <br /> sand) , and after spinning the augers for almost half an hour, we had no choice but to <br /> consider it refusal. We then contacted your office and Mike Infurna (San Joaquin County) <br /> to request permission to install the wells as single completion wells. Mike Infurna <br /> agreed that single completion wells would be reasonable. I believe you were not available <br /> at the time, but based on our previous conversations and experiences when installing MW-10 <br /> (A, B, C & D) , we didn't believe that you would object to single completion wells out <br /> there. Besides, there was nothing else we could do - the limited access drill rig simply <br /> wasn't heavy enough to auger through the stiff silt zone. We proceeded with installing <br /> the *A' zone well in the open borehole. <br /> Upon completion of the *A' zone well, we attempted to install the *B1 zone well. Using 9' <br /> diameter augers, we were able to push past the silt zone, however we encountered extreme <br /> flowing sands between 35 and 45 feet bgs. At one point, Roger indicated that he had 20 <br /> feet of flowing sands coming up into his augers. As hard as we tried to install a *B1 <br /> 1 <br />