ARCHIVED REPORTS_XR0006743 CASE 1

Home Browse Search

2.0 GROUNDWATER MONITORING,NIT SAMPLING AND ANALYSIS On December 20, 2000, Ramage Environmental monitored and sampled groundwater at the site 21 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 83 feet below ground surface (bgs) in MW-1 to 19 68 feet bgs in MW-2 The corresponding groundwater surface elevation ranged from a high of 18 69 feet above mean sea level (msl) at MWA to a low of 18 32 feet msl at MW-4 The resulting groundwater surface appears as an irregular plane dipping to the northeast at a gradient of approximately 0 00435 foot/foot This is consistent with previously measured groundwater flow direction and gradient calculations A groundwater surface contour map is included as Figure 3 The well construction details, wellhead j elevations and groundwater monitoring data are summarized in Table 1 22 Groundwater Sampling and Analysis I 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 i collected from the on-site water supply well, after allowing the water to run for approximately 15 minutes Each sample was labeled, packaged in an iced cooler and transported with chain-of-custody documentation to Kiff Analytical, LLC (Kill), 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 (DIPS), ethyl tertiary butyl ether(ETBE), tertiary amyl methyl ether (TAME), tertiary butanol (TBA), and 1,2-dichloroethane (1,2-DCA) by EPA Method 8260B 5