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16 • Samples were placed in an iced sample container pending transport to the laboratory The field measurements for the four wells were recorded on a field log, along with the time and volume of water purged at each measurement The pH and conductivity meters were calibrated at the beginning of the sample day Copies of Kleinfelder's purge and sample logs are included in Appendix B A trip blank sample was transported with the groundwater sample containers to the analytical laboratory A trip blank is a "clean" water sample that is prepared by the laboratory It is used for quality control purposes If contaminants are detected in the trip blank, it is usually attributed to travel and laboratory-derived contamination If the same contaminants are detected in the well sample and the trip blank sample, the detections may not represent actual contaminants in the wells, but may be results of contamination of the samples during transport or in the laboratory Monitoring Well Survey Kleinfelder retained the services of Morrow Surveying to obtain the longitude, latitude, and top of casing elevations Morrow Surveying is a California State licensed surveyor On October 27, 2004 the wells were surveyed to an accuracy of 1 foot for horizontal coordinates and 0 01 foot for elevations Survey measurements were made on the north rim of the monitoring well PVC casings The wells were surveyed in accordance with the SWRCB UST Program — AB2886 (Electronic Reporting) regulations A copy of the well survey data sheet is included in Appendix C LABORATORY ANALYSIS The trip blank and four groundwater samples were transferred under chain-of-custody documentation to a representative of Kiff Analytical Laboratory in Davis, California Kiff is certified by the State of California for the analyses performed The samples were analyzed for • Total Petroleum Hydrocarbons (TPH) Purgeable (Gasoline Range) ' • BTEX (benzene, toluene, ethylbenzene, and total xylenes) • Five fuel oxygenates (MTBE, TAME, TBA, DIPE, and ETBE) ' • Two lead scavengers (1,2-DCA and EDB) Analytical results for the October 14, 2004 sampling are presented along with previous results in Table 3 Copies of the chain-of-custody form and analytical laboratory reports are included in Appendix D FINDINGS • TPH purgeable as gasoline, BTEX, four of the five fuel oxygenates, 1,2-DCA, and EDB were not detected above laboratory reporting limits in the four monitoring wells • The fuel oxygenate MTBE was detected at 14 ug/L in MW-1, 1 5 ug/L in MW-2, and 0 75 ug/L in MW-3 MTBE was not detected above laboratory reporting limits in MW-4 49014-11SAC4R482 Page 3 of 6 November 18,2004 Copyright 2044 Kleinfelder,Inc KLFINFELDER 3077 Fite Circle,Sacramento, CA 95827-1815 (916)366-1701 (9 16) 3b6-7013 fax