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1 <br /> 2 0 GROUNDWATER MONITORING, SAMPLING AND ANALYSIS <br /> On December 17, 2001, Ramage Environmental monitored and sampled groundwater at the site <br /> 21 Groundwater Monitoring <br /> ' Depth-to-groundwater was measured in all four groundwater monitoring wells to evaluate <br /> groundwater flow and gradient characteristics The depth to the groundwater table, ranged from <br /> 21 09 feet below ground surface (bgs) in MW-1 to 22 01 feet bgs in MW-4 The corresponding <br /> ' groundwater surface elevation ranged from a high of 16 43 feet above mean sea level (msl) at <br /> MW-1 to a low of 15 85 feet msl at MW-4 A different well construction for MW-2 may cause the <br /> groundwater elevation in this well to be incompatible with the elevations in the three other wells <br /> The resulting groundwater surface appears as a regular plane dipping to the northeast at a <br /> gradient of approximately 0 0067 foot/foot A groundwater surface contour map is included as <br /> Figure 3 The well construction details, wellhead elevations and groundwater monitoring data are <br /> summarized in Table 1 <br /> 22 Groundwater Sampling and Analysis <br /> Fallowing the groundwater level measurements, each of the four wells was purged and sampled <br /> The wells were purged using a pump and disposable tubing until at least three well casing <br /> ' volumes were extracted and/or after groundwater temperature, pH and electrical conductivity <br /> values had stabilized <br /> ' Following well purging and recharge, groundwater was sampled from the monitoring wells using <br /> dedicated disposable bailers and laboratory-supplied containers A groundwater sample was also <br /> collected from the on-site water supply well, after pump activation and allowing the water to run for <br /> approximately 15 minutes <br /> rEach sample was labeled, packaged to an iced cooler and transported with chain-of-custody <br /> documentation to Kiff Analytical, LLC (Kiff), a state certified hazardous waste testing laboratory <br /> (Certification#2236) Kiff analyzed each of the groundwater samples for Total Petroleum <br /> Hydrocarbons (TPH)-as-gasoline, benzene, toluene, ethylbenzene, xylenes (BTEX), MTBE, di- <br /> isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME), tertiary <br /> butanol (TBA), and 1,2-dichloroethane (1,2-DCA) by EPA Method 8260B <br /> r <br /> 5 <br /> i <br /> r <br />