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Report: Groundwater-quality Monitoring—October 20-21,2005, 7500 West Eleventh Street,Tracy, C4. Page 16 <br /> F..;_..;; 4.0 MONITORING OF POTABLE WATER SUPPLIES <br /> On October 20, 2005, a sixth round of potable water-quality monitoring was conducted, <br /> encompassing the water supply wells at the following three addresses: <br /> 7500 West Eleventh Street <br /> 23901 South Chrisman Road <br /> 23950 South Chrisman Road <br /> 4.1 Recovery and Analysis of Samples from.Potable Water Supply Wells <br /> r' Before the recovery of potable water samples, each well pump was turned on and water <br /> was flushed through the sampling port for a few minutes. Laboratory-supplied glassware, <br /> with, as appropriate, pre-dispensed preservatives, was then completely filled with water <br /> ., from the sampling port. When full, the glassware was tightly closed, labeled for <br /> identification, and transported, within 24 hours, to STL's laboratory in Pleasanton, <br /> `:- California. <br /> Each water sample was analyzed for the following suite of analytes: <br /> j Analyte Method of Analysis <br /> Total Petroleum Hydrocarbons EPA Method 8015M <br /> . .- (quantified as Diesel) with pre-treatment by <br /> EPA Method 3630. <br /> =# Total Petroleum Hydrocarbons EPA Method 8260B <br /> (quantified as Gasoline) <br /> Benzene EPA Method 8260B <br /> Toluene EPA Method 8260B <br /> Ethyl benzene EPA Method 8260B <br /> I-- <br /> Total Xylene Isomers EPA Method 8260B <br /> E` Tertiary-butyl alcohol EPA Method 8260B . <br /> Methyl-tertiary butyl ether EPA Method 8260B <br /> Di-isopropyl ether EPA Method 8260B <br /> Ethyl tertiary-butyl ether EPA Method 8260B <br /> tertiary-amyl methyl ether EPA Method 8260B <br /> sic <br />