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' Mr Barton September 29,2006 ' Page 2 of 5 • ' monitoring wells were not purged prior to sample collection Field parameters were measured during purging 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 removed from the monitoring wells Field parameters were recorded on a well volume basis ' • After the purge cycle was complete, a groundwater sample was collected for analysis with a disposable polyethylene bailer and transferred to the appropriate laboratory-supplied sample containers prefilled with preservative ' Groundwater monitoring and sampling field data sheets are presented in Attachment 1 Purge water and equipment decontamination water generated during the sampling event was containerized for off-site disposal ' Laboratory Analysis ' 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 of Lancaster, Pennsylvania, a California Department of Health Services-certified analytical laboratory Analyses included the ' • following parameters • total petroleum hydrocarbons (TPH) by United States Environmental Protection Agency ' (USEPA) Method 8015 Modified with gas chromatography — flame ionization detector (GC- FID), ' • benzene, toluene, ethylbenzene, and total xylenes (BTEX)by USEPA Method 8260B, • methyl tertiary butyl ether(MTBE)by USEPA Method 8260B,and ' • trichloroethene(TCE) and tetrachloroethene(PCE)by USEPA Method 8260B Quality assurance/quality control samples inclusive of trip blanks were also submitted for laboratory ' analysis A laboratory supplied trip blank accompanied each sample delivery group Trip blank samples were also collected for TPH, BTEX, and MTBE analyses Analytical results for the quarterly groundwater monitoring event are included in Attachment 1 1 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 Attachment 1 — Table 1 Calculated groundwater elevation data were then used to construct the groundwater potentiometne map Figure 1 presents a groundwater contour map • 047603054 doc t BLASLAND, BOUCK& LEE, INC an ARCADIS company