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i <br /> Report:Groundwater-quality Monitoring—October 27,2004, 7500 West Eleventh Street, Tracy,CA. Page 15 <br /> 4.0 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. 2004b). <br /> 7500 West Eleventh Street <br /> 24195 South Chrisman Road <br /> 7601 West Eleventh Street <br /> f'f 23901 South Chrisman Road <br /> k 23950 South Chrisman Road <br /> Carmelo Business Park <br /> 1. a <br /> A second round of monitoring was conducted on July 27, 2004 (The San Joaquin i <br /> Company Inc. 2004a). <br /> # 4.1 Recovery and Analysis of Samples from Potable Water Supply Wells <br /> 4 r ' <br /> On October 28, 2004, a third round of potable water-quality monitoring was conducted, <br /> encompassing all six wells described above. <br /> Before the recovery of samples, each well pump was turned on and water was flushed <br /> G through the sampling port for a few minutes. Laboratory-supplied glassware, with, as i <br /> appropriate, pre-dispensed preservatives was then completely filled with water from the <br /> sampling ort. When full the glassware was tightly closed labeled for identification, and <br /> � . p gP g l� Y a <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 /> V <br /> 4 <br /> Analyte Method of Analysis <br /> Total Petroleum Hydrocarbons EPA Method 8015M <br /> (quantified as Diesel) with pre-treatment by <br /> 3 EPA Method tho 3630. a <br /> i <br /> E Total Petroleum Hydrocarbons EPA Method 8260B ` <br /> (quantified as Gasoline) j <br /> Benzene EPA Method 8260B <br /> I <br /> Toluene EPA Method 8260B <br /> I; Ethyl benzene EPA Method 8260B <br /> Total Xylene Isomers EPA Method 8260B <br /> Y <br /> Tertiary-butyl alcohol EPA Method 8260B ' <br /> sic <br /> a <br />