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i i i I 5.2. ANALYTICAL METHODS AND REPORTED RANGES Each of the groundwater samples collected were submitted for analysis. The following is a list of the requested analyses and the reported ranges for groundwater samples obtained from the monitoring wells sampled; • Total Petroleum Hydrocarbons as gasoline [non-detect< 50 µg/1] • Benzene [non-detect <0.50 µg/l] • Toluene [non-detect< 0.50 µg/1] • Ethylbenzene [non-detect < 0.50 "11'g/1] • Xylene [non-detect <0.50 p.g/l] • 1,2 DCA [non-detect<0.50 µg/1 to 96 µg/1] • EDB [non-detect<0.50 µg/1] • TBA [8.6 µg/l to 10.8 µg/1] *. MTBE [non-detect<0.50 µg/1 to 0.50 µg/1] DIPE [non-detect<0.50 µg/1] • ETBE [non-detect <0.50 µg/1] • TAME [non-detect<0.50 µg/11 For a summary of analytical data for the analytes listed above, please see Table 2 behind the "Tables"tab of this report. TPH-g was not detected in any of the groundwater samples analyzed this quarter. Similarly, , BTEX compounds were not detected in the same groundwater samples 1,2-DCA was detected in 3 of the 7 groundwater samples. The detected concentrations ranged from 1.4 µg/1 (MW-DIS-14s) to 96 µg/1 (MW-DIS-11s). The detected concentrations of 1,2- DCA exceeded the Primary Maximum Contaminant Level (PMCL) for 1,2-DCA of 5 µg/1 in the sample collected from MW-DIS-llsand MW-DIS-15 (8.4 pg/I). 1,2-DCA was not detected in the remaining 4.samples. EDB was not detected in the any of the groundwater samples collected during this sampling event. TBA was detected each of the 7 groundwater samples this quarter with concentrations ranging from 8.6 ug/l to 10.8 µg/1. This marks the second time TBA has been detected in MW-DIS-1ls and the first time TBA has been reported in MW-DIS-11d, 12, 13, 14s, 14d, and 15. The sample collected from MW-DIS-14s was additionally analyzed for MTBE. The sample l collected from MW-DIS-15 was additionally analyzed for MTBE, DIPE, ETBE, and TAME. MTBE was detected in the sample collected from MW-DIS-14s with a concentration of 0.50 µg/l, while. MTBE was not detected in MW-DIS-15 this quarter. There were no detectable concentrations at or above the laboratory reporting limit for the oxygenates DIPE, ETBE, or TAME in the groundwater sample collected from MW-DIS-15 this quarter. 12290.MON I ST03R1875 Page 9 of 13 ®2004,Kleinfelder,Inc February 9,2004 KLEINFELDER 2825 East Myrtle Street,Stockton,CA 95205-4794 (209)'948-1345 (209)948-0621 fax