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' e <br /> MANAGERS 0G7[iE1WCCftlLLiM1I5 <br /> • 2.0 FIELD SAMPLING SUNIlVIARY <br />' Groundwater samples were collected from monitor wells MW-2A, MW-3A, MW-4, MW-6, <br />' Mw-7, and MW-9 (Figure 1-1) on 9 and 10 December 1998 Groundwater sampling data sheets <br /> are presented in Appendix B <br />' Prior to sampling water levels in all wells were measured on 9 December The standing water <br /> volumes within wells scheduled for sampling were then calculated using the water level <br />' measurements and total well depths A submersible pump was used to purge three well casing <br /> volumes from all of the monitor wells <br />' At the beginning and during the purge process, the temperature, pH, and specific conductance <br /> of the purge water was measured. This information was recorded on a sampling data sheet <br /> Groundwater samples for benzene, toluene, ethylbenzene, and xylene (BTEX) and purgeable <br /> petroleum hydrocarbons as gasoline (TPH-G) analysis were collected from the wells with a <br /> disposable bailer and nylon string The groundwater samples were transferred into 40 ml glass <br /> containers Sample containers were checked for air bubbles then sealed in a plastic bag, placed <br /> liewith ice in an insulated chest, and logged on a chain-of-custody form for delivery to the <br /> analytical laboratory <br /> The pump used to purge the wells was thoroughly cleaned prior to each use with a TSP solution <br /> followed by a potable water rinse and distilled water rinse The disposable tubing was discarded <br /> after purging each well <br /> Purge water from monitor wells MW-3A, MW-4, MW-6, and MW-7 was stored in a holding <br /> tank located at 222 E Weber Avenue. Purge water from MW-2A and MW-9 was stored in a <br /> 55-gallon drum located at 100 N Hunter Street Purge water stored in this drum will be <br /> disposed of at a licensed treatment facility <br /> The groundwater samples collected from the monitor wells were analyzed by EPA Method 8020 <br /> for BTEX and by EPA Method 8015M for TPH-G Groundwater sample analyses were <br /> performed by Sequoia Analytical Laboratory in Walnut Creek, California. <br /> L 1PR0JECTMAN10Q5HSMHSA_99JAN 4 January 19% <br />