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19 July 2000 • AGE-NC Project No 96-0232 Page 14 of 29 6 0 DEPTH TO GROUND WATER MEASUREMENTS On 21, 28 April, 15, 25 May, and 01, 07, 15, 22, 28 June 2000,depth to ground water measurements were collected from on- and off-site monitoring wells Depth to ground water measurements were collected as an indicator of hydrologic control of the plume in the First Zone On 21 and 28 Apnl, monitoring wells MW-1 through MW-7 were utilized for ground water monitoring From 15 May to 28 June, wells MW-1 through MW-13 were utilized for assessing hydrologic control of the plume In the First Zone Ground water elevation contour maps are presented in Figures 5 through 11 61 PROCEDURES The static water level was measured using an electric water level Indicator Water level data was recorded to the nearest 0 01 foot from the surveyed reference point marked of the top of the PVC well casing Before and after each use, the measurement device was washed and rinsed with water • 62 RESULTS Ground water monitoring data collected from 28 April, in the area of Flag City Chevron monitoring • wells MW-1, MW-2, MW-4, MW-5 and MW-6A indicated that the ground water flow direction generally ranged from northeast to southeast at an average gradient of 0 002 ft/ft and 0 003 ft/ft, respectively, or approximately 16 feet per mile, in the First Zone, (Figure 5), the ground water flow direction in the area of well MW-7 was generally north-northwest Depth to ground water in monitoring wells MW-i through MW-7 for the dates of 21 and 28 April 2000 were between 8 11 feet below well casing (bwc) to 10 42 feet bwc Ground water monitoring data collected from 15 and 25 May, in the area of monitoring wells MW-1 through MW-13 were variable The ground water flow direction was generally in a northerly direction at an average gradient of 0 002 ft/ft, in the First Zone, (Figure 6 and 7) Depth to ground water In monitoring wells MW-1 through MW-13 for the dates of 15 and 25 May,were between 7 66 feet bwc to 12 00 feet bwc Ground water monitoring data collected from 01 to 28 June, in the area of monitoring wells MW-1 through MW-13 were variable The ground water flow direction was consistent between 07 to 28 June monitoring events, a northerly direction at an average gradient of 0 002 ft/ft, in the First Zone, (Figures 8, 9, 10, and 11) Ground water was approximately 31 feet above the screen Interval of MW-6B Depth to ground water in monitoring wells MW-1 through MW-13 for the dates of 01 through 28 June 2000 were between 10 07 feet bwc to 14 27 feet bwc Adtanced GeoEn%ironment2i,Inc