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Report Number: 67889 QC Report : Matrix Spike/ Matrix Spike Duplicate Date : 04/15/2009 Project Name : Stockton Promenade - Edison Street Project Number : 7345.09 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 Toluene 67881-01 28 39.9 39.8 66.4 64.6 ug/L EPA 8260B 3/31/09 95.9 91.6 4.64 70-130 25 1,1-Dichloroethane 67898-03 <0.50 40.6 40.6 42.6 41.3 ug/L EPA 8260B 3/28/09 105 102 3.16 70-130 25 • 1,'2-Dichloroethane 67898-03 <0.50 40.3 40.3 38.6 37.3 ug/L EPA 8260B 3/28/09 95.6 92.5 3.32 70-130 25 Benzene 67898-03 <0.50 39.3 39.3 37.7 36.3 ug/L EPA 8260B 3/28/09 95.9 92.2 3.96 70-130 25 Chlorobenzene 67898-03 <0.50 39.8 39.8 39.9 39.6 ug/L EPA 8260B 3/28/09 100 99.5 0.618 70-130 25 Toluene 67898-03 <0.50 40.1 40.1 23.8 17.3 ug/L EPA 8260B 3/28/09 59.2 43.2 31.2 70-130 25 Toluene 67903-14 4.8 40.1 40.1 40.6 39.3 ug/L EPA 82608 3/30/09 89.2 85.9 3.80 70-130 25 Toluene 67903-15 63 40.1 40.1 110 107 ug/L EPA 82608 3/30/09 118 110 6.58 70-130 25 TPH as Diesel BLANK <50 1000 1000 1040 1060 ug/L M EPA 8015 4/1/09 104 106 2.32 70-130 25 1,1-Dichloroethane 67903-14 <0.50 40.6 40.6 41.6 39.9 ug/L EPA 8260B 3/30/09 102 98.3 3.97 70-130 25 1,2-Dichloroethane 67903-14 1.2 40.3 40.3 37.4 37.0 ug/L EPA 8260B 3/30/09 89.7 88.8 0.994 70-130 25 • Benzene 67903-14 72 39.3 39.3 107 103 ug/L EPA 8260B 3/30/09 91.3 80.6 12.4 70-130 25 Chlorobenzene 67903-14 <0.50 39.8 39.8 39.2 38.0 ug/L EPA 8260B 3/30/09 98.3 95.4 3.02 70-130 25 Methyl-t-butyl ether 67858-02 <0.0050 0.0403 0.0401 0.0331 0.0348 mg/Kg EPA 82608 3/26/09 82.1 86.8 5.66 70-130 25 Tert-Butanol 67858-02 <0.0050 0.199 0.198 0.183 0.183 mg/Kg EPA 8260B 3/26/09 91.7 92.4 0.850 70-130 25 KIFF ANALYTICAL, LLC 2795 2nd Street, Suite 300 Davis, CA 95618 530-297-4800