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2.0 GROUNDWATER MONITORING, SAMPLING AND ANALYSIS On March 28, 2003, to comply with quarterly groundwater monitoring requirements, Ramage ' Environmental monitored and sampled groundwater at the site 21 Groundwater Monitoring Depth-to-groundwater was measured in each of the four monitoring wells using a water level indicator capable of measuring groundwater to within 0 01 foot The static depth to the groundwater table ranged from 76 51 feet bgs in MW-1 to 77 34 feet bgs in MW-3 The ' corresponding groundwater surface elevation ranged from a high of 23 50 feet (arbitrary datum) at MW-2 to a low of 23 31 feet (arbitrary datum) at MW-1 The resulting groundwater surface appears as an irregular plane dipping to the north at a gradient of approximately 0 0031 foottfoot 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 ' 2.2 Groundwater Sampling and Analysis Following the groundwater level measurements, each of the wells was purged and sampled The wells were purged using a pump and dedicated 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 wells using dedicated disposable bailers and laboratory-supplied containers Each sample container was labeled, packaged in an iced cooler and transported with chain-of-custody documentation to Kiff Analytical, LLC (Kiff), a state of California certified hazardous waste testing ' laboratory (Certification #2236) Kiff analyzed each of the groundwater samples for TPH-as- gasoline, BTEX, MTBE, DIPE, ETBE, TAME, TBA and 1,2-DCA by EPA Method 8260B ' Ramage Environmental also collected a groundwater sample from the on-site water supply well for laboratory analysis Prior to sampling, the well was purged until the well pump was activated ' The groundwater samples were collected from the wellhead sampling port into laboratory-supplied containers, which were labeled, packaged in an iced cooler and transported with chain-of-custody documentation to Kiff Kiff analyzed the water well sample for TPH-as-gasoline, BTEX, MTBE, ' DIPE, ETBE, TAME, TBA and 1,2-DCA by EPA Method 82608 9 1