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2 0 GROUNDWATER MONITORING, SAMPLING AND ANALYSIS <br /> On August 25, 2004, to comply with quarterly groundwater monitoring requirements and to <br /> evaluate the effectiveness of groundwater extraction efforts, Ramage Environmental monitored <br /> and sampled 9 of the 11 monitoring wells, and collected groundwater samples from the nearby <br /> cemetery irrigation well#2 Monitoring wells MW-1 and MW-8A were dry, and were not <br /> monitored or sampled <br /> 21 Groundwater Monitoring <br /> Depth-to-groundwater measurements were taken in of the accessible groundwater monitoring <br /> wells to evaluate groundwater flow and gradient characteristics The cumulative groundwater <br /> monitoring data are summarized in Table 1 <br /> The depth-to-groundwater beneath the site ranged from 48 15 feet below ground surface (bgs) <br /> at MW-4 to 51 78 feet bgs at MW-7 MW-7 is the only well completed above-grade and <br /> protected with a monument casing The groundwater elevation beneath the site ranged from a <br /> high of 31 24 feet below mean sea level (MSL) at MW-2 to a low of 32 25 feet below MSL at <br /> MW-8B <br /> Separate groundwater surface maps are included for the shallow-constructed wells (Figure 4) <br /> and the deep-constructed wells (Figure 5) Using the shallow-constructed wells, the <br /> groundwater surface appears as a regular plane dipping toward the northeast at a gradient of <br /> 0 00256 foot/foot Using the deep-constructed wells, the groundwater surface appears as an <br /> ' irregular plane dipping toward the northeast at a gradient of 0 00396 foot/foot The groundwater <br /> surface configurations are generally consistent with historical groundwater gradients and flow <br /> directions <br /> 22 Groundwater Sampling and Analysis <br /> rGroundwater was sampled from seven monitoring wells (MW-2, MW-3, MW-4, MW-5, MW-6, <br /> MW-7, and MW-8B), two deep soil vapor extraction wells (VW-1 and VW-2), and Irrigation Well <br /> #2 Each of the monitoring wells and deep soil vapor extraction wells was purged of at least <br /> three well volumes using a pump and disposable tubing Following purging and recharge, <br /> groundwater samples were collected from the wells using dedicated and disposable sampling <br /> bailers Irrigation Well #2 was allowed to flow at the wellhead until the downhole pump was <br /> automatically activated A groundwater sample was collected directly at the wellhead through a <br /> Isample port <br /> . 5 <br />