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r Lkk S E C 0 R Mr Ed Ralston November 13, 2003 Page 2 Pressure transducers installed in the monitoring wells measure the height of the water column above the transducers thereby recording fluctuations In groundwater elevations An increase In the height of the water column recorded by the transducer would therefore translate Into a rising groundwater elevation and a decrease In the height of the water column recorded by the transducer would therefore translate Into a declining groundwater elevation To consider Lathrop Grammer School Irrigation well or other surrounding pumping wells as affecting groundwater elevations or flow directions at the site, one would expect to see declining groundwater elevations during the pumping cycle of the Lathrop Grammer School Irrigation well or other regular declining fluctuations in the groundwater elevation Water level data from each pressure transducer/data logger was uploaded onto the computer for evaluation Downloaded data is Included In Attachment C The following are the results of the downloaded data r Well MW-11 — The pressure transducer/data logger was Installed 1 21 feet below the static water level (equivalent to a water column height of 1 21 feet above the transducer) on October 6, 2003 During the four day period, the height of the water column above the transducer in well MW-11 Increased from 1 21 to 1 27 feet Indicating a rising groundwater elevation Groundwater elevation rose 0 01 feet in well MW-11 during the pumping cycle of Lathrop Grammar School on October 8 and 9, 2003 and October 9 and October 10, 2003 Based on data logger Information, pumping wells do not appear to be affecting groundwater elevations in well MW-11 i Well MW-12 — The pressure transducer/data logger was Installed on October 6, 2003 at 12 03 pm and transducers reading stabilized at 5 03 pm with a water column height of 7 84 feet above the transducer The transducer recorded until October 7, 2003 at 8 26 am The transducer then malfunctioned and recorded data periodically throughout the remainder of the study Based on data logger Information recorded on October 6 and 7, 2003, the water column in well MW-12 fluctuated from 7 82 to 7 84 during the pumping cycle of the Lathrop School Irrigation well, with an Initial water column height of 7 83 and the final water column height of 7 84 Based on the limited data gathered from this well pumping wells do not appear to be affecting groundwater elevation In well MW-12 Well MW-13 — The pressure transducer/data logger was Installed 5 71 feet below the static water level (equivalent to a water column height of 5 71 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-13 Increased from 5 71 to 5 73 feet indicating a rising groundwater elevation Groundwater levels fluctuated by 0 01 feet during the pumping cycle of the Lathrop Grammar School irrigation well On October 9, 2003 at 6 41 am the transducer began recording negative water column heights until 10 10 am The height of the water column recorded from 10 10 am on October 9, 2003 through the end of the test fluctuated from 5 47 to 5 51 feet 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-13 Well MW-14 — The pressure transducer/data logger was Installed 5 41 (stabilized at 1 34 pm) feet below the static water level (equivalent to a water column height of 5 41 feet above the transducer) on October 6, 2003 During the Initial three day period, the height of the water column above the y transducer in well MW-14 increased from 5 41 to 5 55 feet indicating a rising groundwater elevation z Groundwater levels fluctuated by a maximum of 0 04 feet during the pumping cycle of the Lathrop Grammar School irrigation well On October 9, 2003 at 7 24 am the transducer began recording erroneous water column heights until 12 44 pm The height of the water column recorded from 12 44 pm on October 9, 2003 through the end of the test fluctuated from 5 80 to 5 85 feet 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-14 f 1ConocoPhiIlips\Tosco Marketing112051ReportMirrigation well study doc