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r <br /> Mike Infurna EH <br /> From: Jim Barton obarton@waterboards.ca.govi <br /> Sent: Wednesday, August 17, 2011 10:27 AM <br /> To: Mike Infurna [EH] <br /> Subject: RE: 5400 Pacific Avenue Stockton <br /> Attachments: <br /> Stockton - Revised Well DetailsTable (by Well Type) 2011-07-11.pdf <br /> Stockton - Revised <br /> Well Detail... FYI Mike, attached is one table of all of the wells that supplemented the Workplan. <br /> used the non-detect monitoring data to determine if the wells could be pressure grouted. Thanks for <br /> clarifying the issue and for keeping me in the loop. <br /> Jim Barton <br /> James L.L. Barton, P.G. <br /> Engineering Geologist <br /> uality Control Board Central Valley Region, 11020 Sun Center Drive, <br /> California Regional Water Q <br /> Suite 200, Rancho Cordova, CA 95670 office (916) 464-4615 <br /> fax (916) 464-4704 <br /> >>> "Mike Infurna [EH]" <Mlnfurna@sjcehd.com> 8/17/2011 9:44 AM >>> <br /> Thank you Jim. <br /> Ladies and Gentleman, <br /> For your information, I have been in contact with Josh Ewert of GeoCon regarding which wells will be <br /> pressure grouted and which will have the contents removed. <br /> Including the requirement for monitoring wells #2, 3, & 11 as listed in the CVRWQCB August 17 <br /> letter, I have asked Josh to provide me a list of ALL of the wells for this site and a notation next to <br /> each as to the method of destruction he would like to use. I will review this proposal to see if the wells <br /> Josh has proposed for pressure grouting qualify. If they don't, they will be required to have the <br /> contents removed. To qualify for pressure grouting, the soil, gw, and vapor data indicating there is no <br /> residual contamination present must be available. Wells with NO data available will be considered <br /> UNKNOWN and not qualified for pressure grout. <br /> Typically, wells of unknown construction, obstructed, contaminated or in an area of known <br /> contamination`, or incapable of being properly pressure grouted must have the contents removed. <br /> The EHD is mandated by County Ordinance to require wells to have the contents removed <br /> (commonly noted by consultants and drillers as 'over-bored') if they do not meet the requirements for <br /> pressure grouting. <br /> *The EHD interprets 'area of contamination' as the current contamination, or lack of, in the well's <br /> most current lab data for all/any matrix. Laboratory concentrations for any constituent of concern that <br /> is significantly above acceptable detection limits indicates the well is contaminated and cannot qualify <br /> for pressure grout destruction. <br /> t <br /> I <br />