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Evaluation of Natural Attenuation: 7500 West Eleventh Street, Tracy, CA. Page 19 <br /> 5.0 MONITORING OF POTABLE WATER SUPPLIES <br /> In April 2004, monitoring of groundwater in wells that are used to supply potable water <br /> ' to the following addresses was initiated (The San Joaquin Company Inc. 2004d). <br /> 7500 West Eleventh Street <br /> 24195 South Chrisman Road <br /> 7601. West Eleventh Street <br /> F: 23901 South Chrisman Road <br /> 23950 South Chrisman Road <br /> Carmelo Business Park <br /> Those wells were also sampled in July and October 2004 (The San Joaquin Company Inc. <br /> 2004b, c). <br /> 5.1 Recovery and Analysis of Samples from Potable Water Supply Wells <br /> f! On February 25, 2005, a fourth quarterly round of potable water-quality monitoring was <br /> -=' conducted, encompassing all six wells described above. <br /> Before the recovery of samples, each well pump was turned on and water was flushed <br /> through the sampling port for a few minutes. Laboratory-supplied glassware, with, as <br /> appropriate, pre-dispensed preservatives was then completely filled with water from the <br /> sampling port. When full, the glassware was tightly closed, labeled for identification, and <br /> transported,within 6 hours, to STL's laboratory in Pleasanton, California. <br /> Each water sample was analyzed for the following suite of analytes: <br /> p Y g Y <br /> f <br /> Analyte Method of Analysis <br /> -' Total Petroleum Hydrocarbons EPA Method 8015M <br /> (quantified as Diesel) with pre-treatment by <br /> EPA Method 3630. <br /> -1 <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 /> Total Xylene Isomers EPA Method 8260B <br /> Tertiary-butyl alcohol EPA Method 8260B <br /> sic <br /> t <br />