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k'q KLEINFELDER <br /> 1 <br /> MTBE was detected in the groundwater sample collected from MW-DIS-14s with a <br /> concentration of 7.0 ug/l. This marks the first time that MTBE has been detected in <br /> 1 MW-DIS-14s. The PMCL for MTBE is 13 ug/l and the SMCL for MTBE is 5 ug/l. <br /> The detected concentration of MTBE in MW-DIS-14s does not exceed the PMCL but <br /> does exceed the SMCL for MTBE in water. PMCLs are derived from health based <br /> j criteria, whereas SMCLs are derived from human welfare considerations such as taste <br /> and odor. . The oxygenates DIPE, ETBE, or TAME were not detected in any of the <br /> 1 groundwater samples submitted for laboratory analysis during this sampling event. <br /> I <br /> Kleinfelder recommends that monitoring of the site should be continued in accordance <br /> with the "Groundwater Monitoring Frequency Decision Tree at this time. <br /> A copy of this report should be submitted to the San Joaquin County Public Health <br /> ' Services Department Environmental Health Division and the Central Valley Office of the <br /> i State of California Regional Water Quality Control Board by Del Monte, Inc. for their <br /> review and consideration. <br /> t <br /> This report is subject to the limitations found in Chapter 7 of this report. <br /> l ' <br /> i <br /> t <br /> i <br /> f <br /> 1 <br /> I� <br /> .f <br /> 12280.MON/ST02R134 Page 12 of 14 <br /> 0 2002,Kleinfelder,Inc July 26,2002 <br />