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' 20 � <br /> bottom row in the table shows the difference m the sample concentrations expressed as a the <br /> quotient of the sample and duplicate sample concentrations <br /> ' Table 5-2. Comparison of blind duplicate sample results (ug/L),NP-l.. <br /> Sample TPHg MTBE benzene toluene ethylbenzene xylenes <br /> No <br /> NPI-60 170,000 ND>100 21,000 43,000 5,000 31,000 <br /> ' DUP-1` 110,000 77 16,000 31,000 2,500 14,000 <br /> factor 155 -- 132 138 200 221 <br /> ' Notes * DUP-1 is abluid duplicate ofNPI-60 <br /> **Confi=tion analysis by method 8260 resulted m ND(<130 ug/L)for MTBE <br /> Method blanks for soil samples taken with the Simulprobe were nondetect for TPHg, <br /> tMTBE, and BTEX compounds Method blanks for water samples taken with the <br /> SimulprobeO were also nondetect for TPHg, MTBE, BTEX compounds <br /> Laboratory QC procedures performed on soil samples NPI-10 and NPI-90 were all <br /> within acceptable ranges for matrix spike recovery, matrix spike duplicate recovery, and <br /> relative percent difference Laboratory QC procedures performed on a laboratory water <br /> ' sample control duplicate was also within acceptable ranges for matrix spike recovery, matrix <br /> ' spike duplicate recovery, and relative percent difference <br /> ' Detailed laboratory QC reporting and the results of the QA/QC sample analyses are <br /> included in Appendix G <br /> ' 5.7 QUARTERLY GROUNDWATER MONITORING RESULTS <br /> ' The First Quarter 1999 Groundwater Monitoring and Sampling Report at the former <br /> ' UNOCAL Service Station 42859 is attached in Appendix E The report documents the <br /> r development and quarterly groundwater monitoring and sampling events performed by Gettler- <br />