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2.0 GROUNDWATER MONITORING, SAMPLING AND ANALYSIS <br /> 1 <br /> On September 26, 2002, to comply with quarterly groundwater monitoring requirements, Ramage <br /> Environmental monitored and sampled the three monitoring wells at the site <br /> 2.1 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 /> 1 groundwater monitoring data are summarized in Table 1 <br /> On September 26, 2002, the static depth to the groundwater table, as measured in the three <br /> groundwater monitoring wells, ranged from 24 05 feet bgs in MW-2 to 24 15 feet bgs in MW-1 <br /> The corresponding groundwater surface elevation ranged from a high of 12 60 feet above mean <br /> sea level (msl) at MW-2 to a low of 12 51 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 0016 <br /> foottfoot A groundwater surface contour map is included as Figure 3 <br /> 22 Groundwater to Sampling and Analysis <br /> Following groundwater level measurements, all three wells were purged and sampled The wells <br /> were purged using a pump and dedicated 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 Following well purging and recharge, groundwater was sampled from the <br /> 1 wells using dedicated disposable bailers and laboratory-supplied containers <br /> The groundwater samples were transported in an iced cooler with chain-of-custody <br /> ' documentation to Excelchem Environmental Labs (Excelchem), a state of California certified <br /> hazardous waste testing laboratory (Certification #2119) Excelchem analyzed each of the <br /> 1 groundwater samples for TPH-as-diesel, TPH-as-gasoline and BTEX by EPA Method <br /> 8020/8015M, and for MTBE, DIPE, ETBE, TAME, TBA, and 1,2-DCA by EPA Method 8260B <br /> 1 <br /> i <br /> i <br /> 1 <br />