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I <br /> 2701 W. March Lane, Stockton <br /> Page 2 <br /> The second and third quarter 2007 monitoring reports also recommended <br /> increasing the sampling frequency of MW-9D, MW-91 and MW-9S from semi- <br /> annual to quarterly and the EHD approves of this increased sampling frequency. <br /> In addition, if the fourth quarter 2007 monitoring results show that the <br /> concentrations in the above off-site, down-gradient wells, continue to be above <br /> the 5 ug/I secondary maximum contaminant level for MTBE in public drinking <br /> water, then additional down-gradient wells must be installed to define the down- <br /> gradient extent of the MTBE contamination. <br /> 6 <br /> If you have any questions contact me at (209) 468-3449. <br /> Donna Heran, REHS, Director <br /> Environmental <br /> Health Department <br /> Margaret Lagorio, REHS <br /> Program Coordinator Unit IV <br /> c: SJCADA — David Irey <br /> Secor International — Sean Coyle <br /> CVRWQCB —James Barton <br /> Darrell Eppler, 2701 W. March Lane, Stockton <br /> I <br /> f <br /> M <br />