ARCHIVED REPORTS_XR0006740 CASE 1

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2.0 GROUNDWATER MONITORING SAMPLING AND ANALYSIS On March 20, 2001, Ramage Environmental monitored and sampled groundwater at the site 2.1 Groundwater Monitoring Depth-to-groundwater was measured in all four groundwater monitoring wells to evaluate groundwater flow and gradient characteristics The depth to the groundwater table, ranged from 18 78 feet below ground surface (bgs) in MW-1 to 19 78 feet bgs in MW-2 The corresponding groundwater surface elevation ranged from a high of 18 74 feet above mean sea level (msl) at MW-1 to a low of 18 32 feet msl at MW-2 A different well construction for MW-2 may cause the groundwater elevation in this well to be incompatible with the elevations in the three other wells The resulting groundwater surface appears as an irregular plane dipping to the northwest at a gradient of approximately 0 0026 foot/foot A groundwater surface contour map is included as Figure 3 The well construction details, wellhead elevations and groundwater monitoring data are summarized in Table 1 22 Groundwater Sampling and Analysis Following the groundwater level measurements, each of the four wells was purged and sampled The wells were purged using a pump and disposable tubing until at least three well casing volumes were extracted and/or after groundwater temperature, pH and electrical conductivity values had stabilized Following well purging and recharge, groundwater was sampled from the monitoring wells using dedicated disposable bailers and laboratory-supplied containers A groundwater sample was also collected from the on-site water supply well with a bailer, after allowing the water to run for approximately 15 minutes i Each sample was labeled, packaged in an iced cooler and transported with chain-of-custody � documentation to Kiff Analytical, LLC (Kiff), a state certified hazardous waste testing laboratory (Certification #2236) Kiff analyzed each of the groundwater samples for Total Petroleum Hydrocarbons (TPH)-as-gasoline, benzene, toluene, ethylbenzene, xylenes (BTEX), MTBE, di- isopropyl ether PIPE), ethyl tertiary butyl ether (ETRE), tertiary amyl methyl ether (TAME), tertiary butanol (TBA), and 1,2-dichloroethane (1,2-DCA) by EPA Method 8260B 5