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Ii <br /> �( - Page 1 of 2 <br /> W <br /> Mike Infurna [EH] <br /> From : Mike Infurna [EH] <br /> Sent: Wednesday, August 11 , 2010 3 :55 PM <br /> To: Nuel Henderson [EH] <br /> Subject: FW: 240783 - Former Shell - 2575 Country Club, Stockton - ISCO <br /> you wanna 'field ' this one? ??? <br /> From: Neely, Joe [mailto :jneely@craworld.com] <br /> Sent: Wednesday, August 11, 2010 3 :02 PM <br /> To: Mike Infurna [EH] <br /> Subject: 240783 - Former Shell - 2575 Country Club, Stockton - ISCO <br /> Mike : <br /> I just received your Aug 3 letter regarding our ISCO report addendum . I have a question for you <br /> regarding the additional Sodium sampling you request in the letter. <br /> When we issued the ISCO report addendum , we realized that we had ISCO (with sodium persulfate) <br /> proposed at two other sites in Stockton (2494 E . Fremont, and 6131 Pacific Ave). With what we <br /> learned from the 2575 Country Club site we decided to collect water samples at those other two sites <br /> and analyze them for metals and cations. What we found is that both of these sites had background <br /> levels of Na above the WQOs. We are now reconsidering ISCO at these sites as well . <br /> My question to you is this; Is the data we collected at these other two sites sufficient to satisfy your <br /> request for background groundwater re-sampling for Na at the 2575 Country Club site? It seems that <br /> the elevated levels of Na are prevalent throughout Stockton and we are likely to see the same results <br /> with any re-sampling we do at 2575 Country Club. We can submit the data from these other sites with <br /> our Sept 16th submittal if you would like to see it (I think Tom Magney emailed the Na data for 2494 <br /> Fremont). <br /> Please let me know if we can use this Na data from our other two Stockton sites, rather than re-sample <br /> the 2575 Country Club site (and surrounding wells) to validate the high Na levels at this site. <br /> Thanks <br /> Joe <br /> Joe W. Neely, PG <br /> Conestoga-Rovers & Associates (CRA) <br /> 19449 Riverside Drive, Suite 230 <br /> Sonoma, CA 95476 <br /> Phone: 707-933-2361 <br /> Fax: 707-935-6649 <br /> Cell: 707-975-1372 <br /> Email : jneely@CRAworld.com <br /> www.CRAworld .com <br /> Think before you print ] <br /> 8/16/2010 <br />