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Table 3-1 Detected Volatile Organic Compounds Analytical Data ARCO Service Station No 4493 245 N Center Street, Stockton, California 0 Data Qualifier Definitions U The analyte was analyzed for, but was not detected above the sample reporting limit J The analyte was positively identified, the associated numerical value is the approximate concentration of the analyte in the sample N The analysis indicates the presence of an analyte for which there is presumptive evidence to make a "tentative identification NJ The analysis Indicates the presence of an analyte that has been "tentatively identified" and the associated numerical value represents its approximate concentration UJ The analyte was not detected above the reported sample reporting limit However, the reported reporting limit is approximate and may or may not represent the actual limit of quantitation necessary to accurately and precisely measure the analyte in the sample R The sample results are rejected due to identification or other analytical issues ND Not detected above reported detection limit K 1Wprmess\J5 BP ARC010449MOuarterly\3 QTR 03\4493 GWMR 3Q04 Page 5 of 5 Ten!- Dibromo- Di- 1,1- cis -1,2- Bromo- n -Butyl- sec -Butyl- Butyl Chloro- chloro- bromo- Dichloro- Dichloro- Well Date Acetone form benzene benzene benzene form methane methane ethane ethene Number Sampled WL WIL !L) lL WWL) OxyLlL (pg1L) (pq!L 1L Notes P9/L = micrograms per liter < = below given laboratory detection limit -- = not measured or analyzed Ali samples are ran full scan Method 82608 - Analytes consistently non -detect are not listed 0 Data Qualifier Definitions U The analyte was analyzed for, but was not detected above the sample reporting limit J The analyte was positively identified, the associated numerical value is the approximate concentration of the analyte in the sample N The analysis indicates the presence of an analyte for which there is presumptive evidence to make a "tentative identification NJ The analysis Indicates the presence of an analyte that has been "tentatively identified" and the associated numerical value represents its approximate concentration UJ The analyte was not detected above the reported sample reporting limit However, the reported reporting limit is approximate and may or may not represent the actual limit of quantitation necessary to accurately and precisely measure the analyte in the sample R The sample results are rejected due to identification or other analytical issues ND Not detected above reported detection limit K 1Wprmess\J5 BP ARC010449MOuarterly\3 QTR 03\4493 GWMR 3Q04 Page 5 of 5