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Report Number: 67889 <br /> QC Report : Matrix Spike/ Matrix Spike Duplicate Date : 04/15/2009 <br /> Project Name : Stockton Promenade - Edison Street <br /> Project Number : 7345.09 <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked Sample Relative <br /> Spike Spiked Spiked Sample Sample Relative Percent Percent <br /> Spiked Sample Spike Dup. 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 /> Cadmium 67869-01 < 0.50 50.0 50.0 48.6 48.7 mg/Kg EPA 6010B 3/30/09 96.9 97.1 0.206 75-125 20 • <br /> Chromium 67869-01 66 50.0 50.0 114 114 mg/Kg EPA 6010B 3/30/09 96.8 95.2 0.702 75-125 20 <br /> Lead 67869-01 47 50.0 50.0 91.6 91.6 mg/Kg EPA 6010B 3/30/09 89.2 89.0 0.0546 75-125 20 <br /> Nickel 67869-01 72 50.0 50.0 118 118 mg/Kg EPA 6010B 3/30/09 93.8 92.4 0.592 75-125 20 <br /> Zinc 67869-01 78 50.0 50.0 126 126 mg/Kg EPA 6010B 3/30/09 96.9 95.9 0.396 75-125 20 <br /> TPH as Diesel 67886-10 240 20.0 20.0 214 139 mg/Kg M EPA 8015 3/30/09 81.0 52.6 42.4 60-140 25 <br /> TPH as Diesel BLANK <50 1000 1000 928 908 ug/L M EPA 8015 3/28/09 92.8 90.8 2.15 70-130 25 <br /> 1,1-Dichloroethane 67858-02 <0.0050 0.0402 0.0400 0.0359 0.0366 mg/Kg EPA 8260B 3/26/09 89.2 91.4 2.46 70-130 25 <br /> 1,2-Dichloroethane 67858-02 <0.0050 0.0399 0.0397 0.0347 0.0361 mg/Kg EPA 8260B 3/26/09 87.0 90.9 4.47 70-130 25 <br /> Benzene 67858-02 <0.0050 0.0390 0.0387 0.0356 0.0359 mg/Kg EPA 8260B 3/26/09 91.4 92.8 1.51 70-130 25 <br /> Chlorobenzene 67858-02 <0.0050 0.0394 0.0392 0.0334 0.0342 mg/Kg EPA 8260B 3/26/09 84.7 87.1 2.73 70-130 25 <br /> Toluene 67858-02 <0.0050 0.0397 0.0395 0.0349 0.0354 mg/Kg EPA 8260B 3/26/09 87.9 89.6 1.94 70-130 25 <br /> • <br /> 1,1-Dichloroethane 67890-01 <0.50 40.4 40.3 40.7 39.6 ug/L EPA 8260B 3/30/09 100 98.4 2.24 70-130 25 <br /> 1,2-Dichloroethane 67890-01 <0.50 40.2 40.0 44.0 43.2 ug/L EPA 8260B 3/30/09 109 108 1.45 70-130 25 <br /> Benzene 67890-01 370 39.2 39.0 438 429 ug/L EPA 8260B 3/30/09 164 142 14.1 70-130 25 <br /> Chlorobenzene 67890-01 <0.50 39.7 39.5 38.6 38.6 ug/L EPA 8260B 3/30/09 97.4 97.8 0.425 70-130 25 <br /> Toluene 67890-01 4.3 40.0 39.8 44.9 44.3 ug/L EPA 8260B 3/30/09 102 100 1.22 70-130 25 <br /> 4 <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd Street, Suite 300 Davis, CA 95618 530-297-4800 <br />