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2 0 GROUNDWATER MONITORING, SAMPLING AND ANALYSIS <br /> i <br /> On June 8, 2001, Ramage Environmental monitored and sampled groundwater at the site <br /> i <br /> 21 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 <br />' The static depth to the groundwater table, as measured in the three groundwater monitoring wells, <br /> ranged from 73 87 feet bgs in MW-1 to 74 59 feet bgs in MW-3 The corresponding groundwater <br /> surface elevation ranged from a high of 26 25 feet (arbitrary datum) at MW-2 to a low of 25 95 feet <br />' (arbitrary datum) at MW-1 The resulting groundwater surface appears as a regular plane dipping <br /> to the north at a gradient of approximately 0 0048 foot/foot A groundwater surface contour map <br />' is included as Figure 3 The well construction details, wellhead elevations and groundwater <br /> monitoring data are summarized in Table 1 <br /> 1 2.2 Groundwater Sampling and Analysis <br />' Following the groundwater level measurements, each of the wells was purged and sampled The <br /> wells 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 /> wells using dedicated disposable bailers and laboratory-supplied containers Each sample <br />' container was labeled, packaged in an iced cooler and transported with chain-of-custody <br /> documentation to Kiff Analytical, LLC (Kiff), a state of California certified hazardous waste testing <br /> laboratory (Certification #2236) Kiff analyzed each of the groundwater samples for TPH-as- <br />' gasoline, BTEX, MTBE, DIPS, ETBE, TAME, TBA and 1,2-DCA by EPA Method 82608 <br />' Ramage Environmental also collected a groundwater sample from the on-site water well for <br /> laboratory analysis Prior to sampling, the well was purged until the well pump was activated The <br /> groundwater samples were collected from the wellhead sampling port into laboratory-supplied <br />' containers, which were labeled, packaged in an iced cooler and transported with chain-of-custody <br /> documentation to Kiff Kiff analyzed the water well sample for TPH-as-gasoline, BTEX, MTBE, <br /> DIPE, ETBE, TAME, TBA and 1,2-DCA by EPA Method 82608 <br /> 9 <br /> I <br />