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SCOTT HOOTON <br /> PAGE 2 <br /> stability of the plume over a longer period of time will be evaluated from this data and <br /> will ultimately determine the need for more active cleanup at the site or if closure is <br /> warranted. These long term trends are easy to see in a graphic format. Graphic <br /> presentations of concentrations in each well over time are-.also valuable in identifying <br /> trends relative to other site variables. <br /> The additional cost to produce quarterly reports in this manner was discussed. You <br /> indicated that a less frequent sampling frequency (all site wells semi-annually) will <br /> help to offset the extra cost of this reporting. As long term trends can likely be <br /> tracked sufficiently using semi-annual data, this compromise is acceptable to PHS- <br /> EHD at this time. <br /> The status of monitoring well MW#7 was also discussed. As this well is in a freeway <br /> offramp, has been paved over and is not being sampled, it must be located and <br /> destroyed. <br /> PHS-EHD will contact you in three weeks to discuss this letter. If you have any <br /> questions or wish to discuss this letter at an earlier date, please contact Linda <br /> Turkatte, Senior REHS, at (209) 468-3441. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Linda A. Turkatte, Senior REHS Diane M. Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> ENCLOSURE <br /> c: CVRWQCB, Beth Thayer <br /> c: Alisto Engineering, Brady Nagle <br /> c: Tosco, Larry Silva <br /> i <br />