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i <br /> concentrations at or above the laboratory reporting limit for the oxygenates MTBE, DIPE, ETBE, <br /> and TAME in the groundwater sample collected from MW-DIS-15 this quarter. <br /> TBA was detected in MW-DIS-11 s, 11 d, 12, 13, 14s, 14d, and 15 with concentrations ranging <br /> from 8.7 µg/1 to 10.8 �tgll. This marks the second consecutive time TBA has been detected in <br /> MW-DIS-11s and the first time TBA has been reported in MW-DIS-11d, 12, 13, 14s, 14d, and 15 <br /> above the laboratory reporting limit. <br /> Supplemental groundwater samples collected during the fourth quarter from MW-DIS-IIs and <br /> MW-DIS-14s on October 7, 2003, were analyzed for 1,2-DCA, TBA, and MTBE. The results <br /> showed only 1,2-DCA with concentrations of 44 }Lg/l and 1.9 in MW-DIS-11s and MW-DIS-14s <br /> respectively. MTBE was detected in MW-DIS-14s with a concentration of 0.65 µg/1. TBA was <br /> not reported in MW-DIS4Is or MW-DIS-14s during this event. <br /> Because of the anomalous detections of TBA in the downgradient wells, the chromatograms for <br /> the previous three quarters, this quarter, and the supplemental samples were reviewed. Upon <br /> review, the chromatograms showed TBA concentrations in MW-11d, 13, 14s, 14d, and 15 with <br /> concentrations ranging from 0.41 µg11 to 3.93 µg/1. These are below the reporting limit of 5 µg/1. <br /> and were therefore, not reported by the laboratory. It appears, based on the results of the review <br /> and the.known past detections of TBA within the footprint of the Disco facility in 1997 through <br /> 2000 (as reported by CH2M Hill), small concentrations of TBA have been present and migrating <br /> from the source area. Additionally, with the recent start-up of the ozone/sparge system in 2003 <br /> and the lower laboratory reporting limits versus 1997-2000, TBA may have become mobilized <br /> and detectable. <br /> Kleinfelder recommends that a copy of this reportbe submitted to Mr. Mike Infiuna of the San <br /> Joaquin County Public Health Services Department Environmental Health Division (EHD) and <br /> Mr. Jim Barton of the Central Valley Office of the State of California Regional Water Quality <br /> Control Board (CVRWQCB) by Del Monte Foods for their review and consideration. <br /> This report is subject to the limitations found in Chapter 7 of this report. <br /> 1 . <br /> I <br /> l <br /> t <br /> 12280-MON/5T03R1875 <br /> Page 2 of 13 <br /> 19 2004, Kleinfelder,Inc February 9,2004 <br /> KLEINFEEDER 2825 East Myrtle Street, Stockton,CA 95205-4794 (209)948-1345 (209)948-0621 fax <br />