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2 0 GROUNDWATER MONITORING, SAMPLING AND ANALYSIS <br /> On March 19 and June 26, 2002, to comply with quarterly groundwater monitoring requirements, <br /> ' Ramage Environmental monitored and sampled the three monitoring wells at the site <br /> 21 Groundwater Monitoring <br /> Upon arrival at the site, each of the wellheads was inspected, unlocked and opened Depth-to- <br /> groundwater was measured in each of the wells using a water level indicator capable of <br /> measuring groundwater to within 0 01 foot The well construction details, wellhead elevations and <br /> groundwater monitoring data are summarized in Table 1 <br /> On March 19, 2002, the static depth to the groundwater table, as measured in the three <br /> groundwater monitoring wells, ranged from 17 99 feet bgs in MW-2 to 18 07 feet bgs in MW-1 <br /> The corresponding groundwater surface elevation ranged from a high of 18 66 feet above mean <br /> sea level (msl) at MW-2 to a low of 18 59 feet above msl at MW-1 The resulting groundwater <br /> surface appears as a regular plane dipping to the west at a gradient of approximately 0 0012 <br /> foot/foot A groundwater surface contour map is included as Figure 3 <br /> On June 26, 2002, the static depth to the groundwater table, as measured in the three <br /> groundwater monitoring wells, ranged from 22 17 feet bgs in MW-2 to 22 25 feet bgs in MW-1 <br /> The corresponding groundwater surface elevation ranged from a high of 14 48 feet above mean <br /> sea level (msl) at MW-2 to a low of 14 41 feet above msl at MW-1 and MW-3 The resulting <br /> ' groundwater surface appears as a regular plane dipping to the west-northwest at a gradient of <br /> approximately 0 0012 foot/foot A groundwater surface contour map is included as Figure 4 <br /> 22 Groundwater Sampling and Analysis <br /> During both quarterly groundwater monitoring events, following the groundwater level <br /> measurements, each of the wells was purged and sampled The wells were purged using a pump <br /> and dedicated disposable tubing, until at least three well casing volumes were extracted and/or <br /> after groundwater temperature, pH and electrical conductivity values had stabilized Following <br /> well purging and recharge, groundwater was sampled from the wells using dedicated disposable <br /> ' bailers and laboratory-supplied containers <br /> 8 <br />