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Vicki McCartney [EH] <br /> From: Nuel Henderson [EH] <br /> Sent: Monday, September 17, 2007 10:31 AM <br /> To: 'Jim Barton' <br /> Cc: Vicki McCartney[EH] <br /> Subject: RE: 508 Charter Way question <br /> Jim, I wondered the same thing and had made inquiry as to how the wells would be sited and <br /> the drilling information used in the field to set the screens - I was atempting to point <br /> them at the sand unit. Their response was that they wanted first water and wanted to avoid <br /> the sand. As "first water" is generally a site chracterization goal, which in this case I <br /> didn't think added much, I thought they had an argument but couldn't think of a good <br /> objection to that goal. I also thought that if one wanted to know the concentrations and <br /> dissolved mass in the shallow zone without possible dilution by less contaminated water <br /> moving though the sand unit, this would provide such info and give an idea of the <br /> reservoir of dissolved contaminants available to seep into the sand unit - although this <br /> was not a stated objective. Check their map, the proposed wells are generally in the same <br /> area as MW1, MW2 and MW3 and would not have greatly expanded the monitoring coverage of <br /> impacted groundwater in the sand, although one could have been moved to better cover the <br /> down-gradient direction toward the northeast if targeting the sand. I welcome your <br /> thoughts on the issue. <br /> Nuel <br /> -----Original message----- <br /> From: Jim Barton [mailto:jbarton®waterboards.ca.gov] <br /> Sent: Monday, September 17, 2007 7 :44 AM <br /> To: Nuel Henderson [EH] ; Vicki McCartney [EH] <br /> Subject: 508 Charter Way question <br /> Hi Vicki and Nuel, <br /> I received a letter dated 13 September 2007 to Chevron, approving a workplan for new <br /> wells. I noticed that the wells were designed to avoid a suspected sand zone at 30' bgs. <br /> My question is simple, why? Thanks. <br /> Jim <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 /> 1 <br />