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S E C ® R <br /> pE�F <br /> Y <br /> Ms Lori Duncan <br /> October 14, 2003 <br /> Page 2 <br /> between 21 04 and 21 21, which rebounded by 22 30 The pressure transducer/data logger installed <br /> within shallow well MW-3 was working properly until May 11, 2003 at 1 40, after which water level <br /> readings were not recorded at one-minute intervals and depth to water levels significantly deviated <br /> from static levels recorded during the previous days Based on recorded readings, the pressure <br /> transducer/data logger appeared to operate properly between 8 47 and May 12, 2003 at 5 41, after <br /> which the pressure/transducer/data logger began to record erroneous measurements at varied time <br /> intervals <br /> Though the pressure transducer/data logger for deep well DMW-2 was properly programmed, the <br /> pressure transducer/data logger appeared to have malfunctioned based on the lack of data and the <br /> erroneous start date recorded <br /> CONCLUSIONS <br /> Over the monitoring period, no significant fluctuations in groundwater levels comparable to the 10- <br /> foot decrease in the water level within well DMW-2 measured during the July 2002 groundwater <br /> sampling event were recorded in any of the groundwater monitoring wells screened in the shallow <br /> and deeper water-bearing zones Although continuous depth to water measurements were not ar <br />• recorded in well DMW-2, which is the nearest deep zone well to the on-site domestic well, depth to <br /> water measurements in deeper zone wells DMW-1 through DMW-3 over the last four consecutive <br /> quarterly groundwater monitoring events since July 2002 have ranged between 63 68 feet and 66 62 <br /> feet bgs Results of this study suggest that the usage of the on-site domestic well does not influence z <br /> water levels in the shallow and deeper water-bearing zone beneath the site, and that the anomalous <br /> 73 15-foot depth to water reading recorded during the July 2002 groundwater monitoring event was <br /> either erroneously measured or recorded onto the field data sheets <br /> If you have any questions or concerns, please call (916) 861-0400 <br /> Sincerely, <br /> SECOR International Incorporated <br /> ,f <br /> Kristen Flesoras <br /> Project Scientist <br /> Lt <br /> Rusty Benkosky, P E <br /> Senior Engineer <br /> Attachments Figure 1 — Site Location Map <br /> Figure 2— Site Plan <br /> Attachment 1 —SJCEHD Letter Dated February 28, 2003 <br /> Attachment 2—Field Data Sheets <br /> Attachment 3—Compact Disc Containing Water Level Data <br /> cc Mr Paul Supple, BP <br /> 1ARC0105951Misc LetterslResults of Water Level monitoring doc <br /> to <br />