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Report:Groundwater-quality Monitoring—July 27,2004. 7500 West Eleventh Street, Tracy, CA. Page 15 <br /> f ' 4.0 MONITORING OF POTABLE WATER SUPPLIES <br /> �7 <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. 2004a). <br /> 7500 West Eleventh Street <br /> 24195 South Chrisman Road <br /> 7601 West Eleventh Street <br /> k.- 23901 South Chrisman Road <br /> 23950 South Chrisman Road <br /> Carmelo Business Park <br /> 4.1 Recovery and Analysis of Samples from Potable Water Supply Wells <br /> On July 27, 2004, a second round of potable water-quality monitoring was conducted, <br /> encompassing all six wells described above. <br /> =:a 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 /> Anal e Method of Analysis <br /> sis <br /> Total Petroleum Hydrocarbons EPA Method 8015M <br /> (quantified as Diesel) with pre-treatment by <br /> EPA Method 3630. <br /> i 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 /> 1' Total Xylene Isomers EPA Method 8260B <br /> Tertiary-butyl alcohol EPA Method 8260B <br /> 3 Methyl-tertiary butyl ether EPA Method 8260B <br /> sic <br /> { <br /> J <br />