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Report Number 23971 QC Report : Matrix Spike/Matrix Spike Duplicate Date 1/8/2002 Project Name . 3725 Tracy Blvd, Tracy Project Number 243-0813 i Duplicate Spiked Duplicate Spiked Spiked Sample Relative Spike Spiked Spiked Sample Sample Relative Percent Percent Spiked Sample Spike Dup Sample Sample Analysis Date Percent Percent Percent Recov Diff Parameter Sample Value Level Level Value Value Units Method Analyzed Recov Recov Diff Limit Limit TPH as Diesel Blank <50 1000 1000 925 1000 ug/L M EPA 8015 12120120092 5 100 784 70-130 25 TPH as Diesel 23971-06 <1 0 200 200 193 193 mg/Kg M EPA 8015 12128120096 6 966 00145 60-140 25 TPH as Diesel Blank <50 1000 1000 1180 1060 ug/L M EPA 8015 121261200118 106 107 70-130 25 Benzene 23894-03 <0 0050 00380 00406 00343 00373 mg/Kg EPA 8260B 12124120090 2 917 162 70-130 25 Toluene 23894-03 <0 0050 00380 00406 00334 00364 mg/Kg EPA 8260B 12124120087 9 896 189 70-130 25 Tert-Butanol 23894-03 <0 0050 0 190 0203 0 168 0 191 mg/Kg EPA 8260B 12124120088 3 941 636 70-130 25 Methyl-t-Butyl Ether 23894-03 <0 0050 00380 00406 00323 00367 mg/Kg EPA 8260E 12124120084 8 904 628 70-130 25 Benzene 23947-01 <0 50 193 191 194 190 ug/L EPA 82608 121271200100 993 1 15 70-130 25 Toluene 23947-01 <0 50 193 191 189 185 ug/L EPA 8260B 12127120098 0 967 134 70-130 25 Tert-Butanol 23947-01 <5 0 966 95 7 925 921 ug/L EPA 8260B 12127120095 8 962 0 484 70-130 25 Methyl-t-Butyl Ether23947-01 <0 50 19 3 191 191 18 8 ug/L EPA 82608 12127/20098 7 98 3 0 431 70-130 25 Benzene 23871-06 <0 50 400 400 434 426 ug/L EPA 8260B 121241200108 106 181 70-130 25 Toluene 23871-06 <0 50 400 400 438 428 ug/L EPA 8260B 121241200109 107 222 70-130 25 Ter#-Butanol 23871-06 <5 0 200 200 198 196 ug/L EPA 82608 12124120098 9 978 1 11 70-130 25 Methyl-t-Butyl Ether 23871-06 <0 50 400 400 469 45 4 ug/L EPA 8260B 121241200117 114 312 70-130 25 KIFF ANA Approved By J I Kiff [CAL, LLC 720 Olive Drive, Suite D vis, CA 95616 530-297-4800 •