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Report Number 30232 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 12/17/02 <br /> Project Name 7700 Moreland Court, <br /> Project Number 021205-MS-1 <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked Sample Relative <br /> Spike Spiked Spiked Sample Sample Relative Percent Percent <br /> Spiked Sample Spike DUD Sample Sample Analysis Date Percent Percent Percent Recov Diff <br /> Parameter Sample Value Level Level Value Value Units Method Analyzed Recov Recov Diff Limit Limit <br /> Benzene 30174-04 <0 50 400 400 405 391 ug1L EPA 82608 12/10/02 101 97 7 367 70-130 25 <br /> Toluene 30174-04 085 400 400 38 0 378 ug/L EPA 82606 12/10/02 929 92 4 0 513 70-130 25 <br /> Tert-Butanol 30174-04 72 200 200 268 262 ug/L EPA 82606 12/10/02 97 9 948 320 70-130 25 <br /> Methyl-t-Butyl Ether 30174-04 <0 50 400 400 36 4 374 ug/L EPA 82606 12/10/02 910 935 2 71 70-130 25 <br /> I <br /> Benzene 30385-02 <0 50 400 400 395 391 ug/L EPA 82606 12/16/02 988 978 0 992 70-130 25 i <br /> Toluene 30385-02 <0 50 400 400 381 38 0 ug/L EPA 8260B 12/16/02 954 94 9 0 499 70-130 25 <br /> Tert-Butanol 30385-02 16 200 200 212 216 ug/L EPA 82606 12/16/02 980 999 1 91 70-130 25 <br /> Methyl-t-Butyl Ether 30385-02 170 400 400 218 217 ug/L EPA 82608 12/16/02 109 107 2 01 70-130 25 <br /> Benzene 30245-04 35 400 400 411 409 ug/L EPA 82606 12/12/02 941 936 0 613 70-130 25 I <br /> Toluene 30245-04 <0 50 400 400 391 38 6 ug1L EPA 8260B 12/12/02 978 966 129 70-130 25 <br /> Tert-Butanol 30245-04 <5 0 200 200 181 184 ug/L EPA 82608 12/12/02 903 918 170 70-130 25 <br /> Methyl-t-Butyl Ether 30245-04 13 400 400 528 530 ug/L EPA 82606 12/12/02 100 101 0 523 70-130 25 <br /> 4 <br /> I <br /> KIFF AN <br /> Approved By J I Kiff <br /> 1CAL, LLC <br /> 2795 2nd St, Suite 300 is, CA 95616 530-297-4800 <br />