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Ms Victoria McCartney May 11, 2006 ' Page 2 of 4 . A three-volume purging and sample technique, using a decontaminated stack pump and disposable bailer, ' was used for groundwater purging and sample collection Field parameters were measured after each well volume using the following series of activities and sampling protocols • During the purge cycle, groundwater field parameter measurements consisting of specific conductance,pH, and temperature were measured using a groundwater water-quality meter • At least three times the volume of standing water was purged from the monitoring well Monitoring wells were purged until the field parameters noted above for each well stabilized Field parameters were recorded on a well volume basis ' • After the field parameters stabilized as specified, a groundwater sample was collected for analysis with a disposable polyethylene bailer and transferred to the appropriate laboratory-supplied sample container Pre-preserved laboratory-supplied containers were used for sample collection Groundwater monitoring and sampling field data sheets are presented as attachments to the G-R monitoring report,provided in Attachment 1 Subsequent to collection, samples were packed on ice, cooled to approximately 4°C, and shipped under appropriate chain-of-custody protocols for analysis to Lancaster Laboratories (Lancaster) of Lancaster Pennsylvania, a California-certified analytical laboratory Analyses included the following parameters • total petroleum hydrocarbons in the gasoline range [TPH-G (C6-CIO)], total petroleum hydrocarbons in the diesel range [TPH-D (C10-C28)], total petroleum hydrocarbons in the motor oil range [TPH-MO (C 16-C36)], and methanol by United States Environmental Protection Agency (USEPA)Method 8015, o benzene, toluene, ethylbenzene, and total xylenes (BTEX)by USEPA Method 826013, and G t-butyl alcohol (TBA), methyl tertiary butyl ether (MTBE), di-isopropyl alcohol (DIPE), ethyl tertiary butyl alcohol (ETBE), tertiary amyl methyl ether (TAME), 1,2-dichloroethane (1,2- DCA), ethylene dibromide(EDB), and ethanol by USEPA Method 8260B Quality assurance/quality control samples inclusive of trip blanks were also submitted for laboratory t analysis A laboratory supplied trip blank accompanied each sample delivery group Trip blank samples were collected at a rate of one per 20 samples for TPH-G, BTEX, and MTBE Analytical results for the quarterly groundwater monitoring event are included as attachments to the G-R monitoring report, provided in Attachment 1 Purge water and equipment decontamination water generated during the sampling event was containerized for off-site disposal Monitoring Results ' Depth to water measurements were subtracted from the surveyed top-of-casing elevation to calculate the groundwater elevations for each monitoring well Depth to water and the calculated groundwater elevations are presented in Table 1 of the G-R monitoring report(Attachment 1) Calculated groundwater elevation data were then used to construct the groundwater potentiometric map (Figure 1 of the G-R monitoring report,provided in Attachment 1) J ID000619-2033_00161022_First Qtr 2006 doe BLASLAND, BOUCK&LEE, INC engineers,scientists,economists