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r <br /> Method 8260 Analytical data from the three sites are presented as Tables <br /> Four, Five, and Six The certified analytical report and chain-of-custody <br /> documentation are included as Appendix B <br /> 4.0 CONCLUSIONS <br /> • The groundwater sample collected from monitoring well MWA <br /> contained 22 ppb MTBE <br /> • The groundwater sample collected from monitoring well MW-2 <br /> contained 180 ppb MTBE, 35 ppb tert-butanol (TBA), and 1 1 p p b <br /> TAME <br /> • The groundwater sample collected from monitoring well MW-4 <br /> contained 39 ppb MTBE <br /> • The groundwater samples collected from monitoring well MW-5 <br /> contained 093 ppb MTBE <br /> • No other hydrocarbons were detected above the laboratory method <br /> reporting limits in any of the groundwater samples collected <br /> The MTBE concentration in the groundwater sample collected from <br /> monitoring well MW-2 exceeded the California Department of Health <br /> Services (DHS) Maximum Contaminant Levels (MCLs) for drinking water <br /> MNo other compound concentrations exceeded MCLs Hydrocarbon and <br /> oxygenate concentrations were generally lower than the previous <br /> quarter's concentrations <br /> 5.0 RECOMMENDATIONS <br /> ASE recommends continuing operation of the ozone sparging system and <br /> quarterly groundwater monitoring The next sampling is scheduled for <br /> April 2006 <br /> 6.0 REPORT LIMITATIONS <br /> The results presented in this report represent the conditions at the time <br /> of the groundwater sampling, at the specific locations where the <br /> groundwater samples were collected, and for the specific parameters <br /> analyzed by the laboratory It does not fully characterize the site f or <br /> contamination resulting from sources other than the former underground <br /> storage tanks and associated plumbing at the site, or for parameters n o t <br /> analyzed by the laboratory All of the laboratory work cited in this report <br /> was prepared under the direction of independent CAL-DHS certified <br /> • laboratory The independent laboratory is solely responsible for th e <br /> contents and conclusions of the chemical analysis data <br /> Singh's Unocal Service Station Quarterly Report — January 2006 Sampling <br /> -3- <br />