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7-Elcvcn/Stockton <br /> April, 1988 5 <br /> GROUNDWATER MONITORING <br /> Groundwater monitoring was performed every two weeks to <br /> determine the depth-to-liquid interface and thickness of free <br /> product, if present. The monitoring data for the months of <br /> November through March are presented in Table I of Appendix I. <br /> _ Groundwater monitoring was conducted in accordance with GTI's <br /> Standard Operating Procedure (Sop) 8 (see Appendix II) . Ground- <br /> water Gradient Maps, (Figures 3, 4, 5, 6, and 7) , were construc- <br /> ted using data from a selected date from each month of this <br /> reporting period. <br /> The results of the monitoring data document a gradual rise <br /> of the groundwater table due to normal seasonal rainfall until <br /> :A. the final monitoring round on March 24, 1988. The water table <br /> lowered approximately 0.25 feet between March 11 and March 24, <br /> 1988. Free product was present in monitoring well 1 (MW-1) , MW_ <br /> 3, and MW-4 until January, 1988. The maximum product thickness <br /> of 0.33 feet was recorded on November 6, 1987 in MW-1 and on <br /> December 2, 1987 in MW-3. No free <br /> product is present in any <br /> monitoring wells at the current time. <br /> GROUNDWATER SAMPLING AND ANALYSES <br /> Groundwater monitoring wells and nearby domestic wells were <br /> sampled on a regular basis to detect changes in hydrocarbon <br /> concentrations and to document the areal extent of the contami- <br /> nant plume. The samples were collected in accordance with GTI's <br /> SOP's 9, 10, 11, and 12 (Appendix II) . Each sample was <br /> rCkUI:NIM,.tTkA <br />