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Page 1 of 2 <br /> Mike Infurna [EH] <br /> From: Neely,Joe Oneefy@craworld.com] <br /> Sent: Thursday ,2011 10:52 AM <br /> To: Mike Infuma [EH] <br /> Subject: ZI��Stockton -Sampling reductions <br /> Attachments: 240783-2011GN-S0002 figure 3 - Extended Site Plan.pdf <br /> Mike: <br /> I tried to call you to discuss this but you were not in, and I figured it would be better to send you an <br /> email rather than leave you a long voice mail for this matter. <br /> I reviewed this site with Denis Brown and he is interested in doing some sampling reductions. And we <br /> wanted to bounce these reduction ideas off of you before putting them in a letter for you to review. <br /> • The first thought is to eliminate or reduce the frequency of analysis for ETRE, DIPE, and TAME. <br /> Currently we analyze for these constituents in 7 monitoring wells at different frequencies. DIPE <br /> has been detected only 3 times at low levels, ETBE has never been detected, and TAME has <br /> been detected in several onsite wells (MW-5, MW-5R, RW-1A, MW-8, MWA7, and MWA8)with <br /> the most recent high detection of 50 ppb (MW-18, May 2011). If there is any concern about <br /> TAME,we could continue this annually in the wells it has been previously detected in. <br /> • Domestic Well and Caltrans Well Sampling. We would like to discontinue sampling of the <br /> domestic wells and the CalTrans well. We have a large body of data that says the Shell plume <br /> has not migrated toward, or affected these water supply wells. In addition we have sentry wells <br /> (MW-9, MW-10, MWA 1, and MW-14) in place between the site and these wells which monitor <br /> the plume, and if we start to see the plume move toward these wells, we could always re-initiate <br /> sampling. Plume migration is not likely as the data show it is declining is size. <br /> I've attached a recent site map for reference. <br /> Please let me know your thoughts on this plan and if it looks good, I'll write it up in a letter and send it to <br /> you for review and approval. <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 A <br /> Perform every task the safe way,the right way,every timet <br /> 10/6/2011 <br />