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Navarra Site:Potable Wate4upply Well Program Page G of 7 in essentially every report on the Navarra Site that SJC has submitted to the SJCEHD, water levels in and around the 7500 West Eleventh Street site are controlled by agricultural irrigation practices in the Tracy area and have little or no correlation with seasonal precipitation. Analytical Suite We recommend that for the revised monitoring program, the samples of water recovered from the three potable water supply wells be analyzed for the following suite of analytes: Analyte Method of Analysis Total Petroleum Hydrocarbons EPA Method 8015M (quantified as Diesel) with pre-treatment by EPA Method 3630. Total Petroleum Hydrocarbons EPA Method 8260B (quantified as Gasoline) Benzene EPA Method 8260B Toluene EPA Method 8260B Ethyl benzene EPA Method 8260B ,f Total Xylene Isomers EPA Method 8260B Tertiary-butyl alcohol EPA Method 8260B Methyl-tertiary butyl ether EPA Method 8260B Di-isopropyl ether EPA Method 8260B Ethyl tertiary-butyl ether EPA Method 8260B Tertiary-amyl methyl ether EPA Method 8260B The analytical suite specified above is the same as that used in the previously-approved potable water monitoring program and is appropriate given the types of fuel hydrocarbons released at the Navarra Site. It does not include additional analyses for ethanol and methanol, which the SICEHD requested as part of the February 2005 monitoring round that, as would be expected based on the type of fuels that had been stored in the tanks formerly located on the 7500 West Eleventh Street Site, were not detected in any of the potable water supply wells, nor in any of the 27 groundwater- quality monitoring wells that were monitored during that sampling event. Moreover, it does not include EDB or 1,2 DCA, both of which had previously been demonstrated to be