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Report: Groundwater-quality Monitoring—April 15,1003: 7500 West Eleventh Street, Tracy, C,4. Page 9 <br /> r <br /> 2.3 Recovery of Groundwater Samples from Monitoring Wells <br /> After purging, samples were recovered from each monitoring well (with the exception of <br /> Monitoring Well MW-7) using a disposable bailer. Water brought to the surface in the <br /> bailer was decanted so as to fill completely the clean glassware supplied by the <br /> laboratory. The sample vials and jars were then tightly closed, labeled for identification, <br /> entered into chain-of-custody control, packed on chemical ice and held in refrigerated <br /> storage until they were transported, within eight hours, to Severn Trent Laboratories' <br /> (STL) laboratory in Pleasanton, California for analysis. <br /> 2.4 Analyses of Groundwater Samples <br /> Each groundwater sample, with the exception of Sample No. 12AS, was analyzed at the <br /> laboratory for the following suite of analytes. <br /> Analyte alyte Method of Analysis <br /> Total Petroleum Hydrocarbons EPA Method 8015M <br /> (quantified as Diesel) <br /> Total Petroleum Hydrocarbons EPA Method 8260B <br /> (quantified as Gasoline) <br /> Benzene EPA Method 8260B <br /> I_ Toluene EPA Method 8260B <br /> a Ethylberizene EPA Method 8260B <br /> Total Xylene Isomers EPA Method 8260B <br /> 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 /> 1,2 Dichloroethaue EPA Method 8260B <br /> Note: In the case of the analyses for Diesel, the sub-aliquot of the sample from each <br /> + monitoring well was prepared with silica gel before injection into the gas chromatograph. <br /> i <br /> sic <br /> s <br />