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Mr. Gerald Dj uth <br />September 17, 2004 <br />Page 2 <br />A key observation is that the site groundwater levels are the lowest we have recorded <br />going back to September 1996. For the oldest monitoring wells (MW -1 through MW -4), <br />the present water levels are about 1 foot lower than the September 1996 readings. <br />We recommend continuing observation and monitoring of the new well on a quarterly <br />basis for one year to observe gradient vs. concentration relationships and possible trends. <br />In addition, a confirmation groundwater sample will be collected from MW -15 on or <br />about September 15. Further conclusions regarding the monitoring results will be <br />developed in the annual monitoring report. <br />Per your request, the complete analytical data package for samples collected on August <br />17 and 18 is included. This data package includes most of the samples that were <br />collected for annual monitoring, but does not include the preliminary results for three <br />wells that were sampled separately due to low groundwater levels (MW -9, MW -11, and <br />GW -6). All monitoring well data received to date have been summarized in Table 6 and <br />will be exhibited in the upcoming annual monitoring report. <br />Please do not hesitate to call me at our Walnut Creek office at (925) 941-3723 or contact <br />Mike McAnulty at (714) 228-6709 if you have any questions. <br />Very truly yours, <br />T <br />OC. intzer, R.G., C.E.G. <br />Project Manager <br />Attachments: <br />Figure 1 — Well Location Map <br />Well Installation Log (2 p.) <br />Table 6 — Groundwater Analytical Results, 3rd Quarter 2004, Annual Sampling <br />Laboratory data package (22 p.) <br />cc: (w/o laboratory data package) <br />Mr. Michael C. McAnulty, BP Amoco Chemical Co., La Palma, CA <br />Mr. Lon Kitagawa, AASC, Stockton <br />