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k'q KLEINFELDER <br /> 80'). The PMCL for toluene is 150 ug/l. All four detected concentrations of toluene <br /> exceeded the PMCL for toluene. <br /> Ethylbenzene and xylene were detected in five groundwater samples collected from <br /> the monitoring wells. The detected concentrations of ethylbenzene ranged from 1.8 <br /> ug/l (MW-DIS-2) to 5,100 ug/1 (NP-1-80'). The detected concentrations of xylene <br /> ranged from 1.6 ug/l (MW-DIS-2) to 26,000 ug/l (NP-!-80').The PMCL for <br /> ethylbenzene and xylene are 700 ug/1 and 1,750 ug/l respectively. The detected <br /> concentrations of ethybenzene and xylene exceeded the PMCL's in four of the five <br /> detections. <br /> MTBE was detected in the groundwater sample collected from MW-DIS-14s with a <br /> concentration of 9.9 ug/l. This marks the second consecutive time that MTBE has <br /> been detected in MW-DIS-14s. MTBE was not detected in the remaining eleven <br /> samples. The PMCL for MTBE is 13 ug/l and the SMCL for MTBE is 5 ug/1. The <br /> 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 /> criteria, whereas SMCLs are derived from human welfare considerations such as taste <br /> j and odor. <br /> Kleinfelder recommends that monitoring of the site should be continued in accordance <br /> with the "Groundwater Monitoring Frequency Decision Tree at this time. A copy of this <br /> report should be submitted to the San Joaquin County Public Health Services Department <br /> Environmental Health Division and the Central Valley Office of the State of California <br /> Regional Water Quality Control Board by Del Monte, Inc. for their review and <br /> consideration. <br /> This report is subject to the limitations found in Chapter 7 of this report. <br /> I <br /> 12280.MON/ST02R519 Page 12 of 14 <br /> 0 2002,Kleinfelder,Inc September 19,2002 <br />