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r 1 0 E C ® R Mr Ed Ralston November 13, 2003 Page 3 Well MW-16 — The pressure transducer/data logger was installed 5 25 feet below the static water level (equivalent to a water column height of 5 25 feet above the transducer) on October 6, 2003 During the initial three day period, the height of the water column above the transducer in well MW-16 increased from 5 25 to 5 34 feet indicating a rising groundwater elevation Groundwater levels fluctuated by maximum of 003 feet during the pumping cycle of the Lathrop Grammar School irrigation well On October 9, 2003 at 645 am the transducer began recording erroneous water column heights until 11 03 am The height of the water column recorded from 11 30 am on October 9, 2003 through the end of the test fluctuated from 5 47 to 5 50 feet, with the exception of data recorded at 11 13 am and 11 23 am on October 9, 2003 Based on the data gathered from this well during the initial three days, pumping wells do not appear to be affecting groundwater flow in well MW-16 CONCLUSION Based on the data gathered from the transducers/data logger, groundwater in wells MW-11, MW-13, MW-14, and MW-16 generally was rising during the initial three days of the study Groundwater levels fluctuated by a maximum of a positive 0 04 feet during the pumping cycle of the Lathrop Grammar School well Well MW-11, MW-13, MW-14, and MW-16 each recorded erroneous data for approximately 3-4 hours on the morning of October 9, 2003 Global Water (provider of the transducers/data loggers) could not provide and explanation for the apparent erroneous data during • this time period in each of the wells After the morning of October 9, 2003 each of the transducers recorded stable to rising water levels Based on the above data and the sample indicating that the Lathrop Grammar School well has not been impact, it indicates that the surrounding pumping wells are not influencing groundwater elevation and flow at the site If there are any questions, please call us at (916) 861-0400 _ y Sincerely, SECOR International, Incorporated ?P0E5S Clinton Harms Protect Scientist NO C 058399 rn Exp I sTq� CAAIL JBeeosky, P E OFCigL1F Senior Engineer Attachments Figure 1 - Site Location Map w Figure 2— Extended Site Map Attachment A—SJCEHD Letter Dated May 8, 2003 Attachment B— Field Notes and Laboratory Analytical Report Attachment C—Well Transducer/Data Logger Results . cc Mr Ed Ralston, ConocoPhillips 11CcnocoPhillips\Tosco Marketing112051Reportslirngation well study doc 1 xr r�