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Page 1 of 2 <br /> I <br /> Harlin Knoll [EH] <br /> To: Silva, Larry <br /> Subject: RE: Site 9-3232 , 8660 Lower Sacramento Rd . (632278) <br /> Larry: <br /> These changes can be done , but keep in mind the CVRWQCB may require additional rounds w/shorter sampling <br /> intervals or adding the dropped analyses as we approach close/NFAR at this site . <br /> HARLIN KNOLL <br /> SAN JOAQUIN COUNTY/EHD <br /> 600 E MAIN STREET <br /> STOCKTON , CA 95202 <br /> (209) 468-3442 <br /> FAX: 468-3433 <br /> From : Silva, Larry [mailto: lsilva@craworld.com] <br /> Sent: Sunday, June 21, 2009 12: 11 PM <br /> To: Harlin Knoll [EH] <br /> Subject: Site 9-3232, 8660 Lower Sacramento Rd. (632278) <br /> Good Morning Mr. Knoll, <br /> I am following up on recommendations CRA made in the first and second quarter 2009 groundwater <br /> monitoring reports for Site 9-3232 located at 8660 Lower Sacramento Road in Stockton, California. In these <br /> reports CRA recommended 1) modifying the sampling frequency (quarterly to annual) for wells MW-1, <br /> MW-4, MW-5, MW-5D, MW-6, MW-6D, and MW-7 and 2) discontinuing sampling for oxygenates, <br /> di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME), ethanol, <br /> 1,2-DCA, and EDB in all wells. <br /> CRXs recommendation to modify the sampling frequency was based on the maturity of the sampling and <br /> monitoring program at the site as well as the consistent data trends in several wells. The recommendation <br /> to discontinue sampling for oxygenates was based on, with exception of low concentrations of 1,2-DCA in <br /> several wells, the absence of these constituents detected in the site wells since sampling was initiated at <br /> the site. <br /> Your response would be greatly appreciated it. I look forward to hearing from you soon. <br /> Thanks, <br /> Larry J. Silva <br /> Conestoga-Rovers & Associates (CRA) <br /> 10969 Trade Center Drive, Suite 107 <br /> Rancho Cordova, California 95670 <br /> (916) 889-8914 direct <br /> (916) 919-7372 cell <br /> 6/22/2009 <br />