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819 Sinker Avenue Suite 8 <br /> Sequoia Sacramento )9 95834 <br /> (9]6)921 9600 <br /> FAX 100 <br /> Analytical wwseq 6ialabs om <br /> www sequo[alabs coin <br /> SECOR International-Rancho Cordova Project ARCO 4493,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number 4493,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 06/17/02 11 52 <br /> Total Purgeable Hydrocarbons and BTEX by DHS LUFT- Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lurut Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2060183-EPA 5030B(P/T) <br /> Blank(2060183-BLK1) Prepared&Analyzed 06/14/02 <br /> Purgeable Hydrocarbons ND 50 ug/1 <br /> Benzene ND 050 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate a a a-Trifluorotoluene 9 84 /00 98 60-140 <br /> LCS(2060183-BSI) Prepared&Analyzed 06/I4/02 <br /> Benzene 855 050 119/1 100 86 70-130 <br /> Toluene 105 050 100 105 70-130 <br /> Ethylbenzene 11 9 050 10 0 119 70-130 <br /> Xylenes(total) 367 050 300 122 70-130 <br /> 4Krrogate aaa-Triuorotoluene 107 10 0 107 60-140 <br /> atrix Spike(2060183-MS1) Source 5206176-02 Prepared&Analyzed 06/14/02 <br /> Benzene 8 11 0 50 ug/l 100 ND 81 60-140 <br /> Toluene 101 050 10 0 ND 101 60-140 <br /> Ethylbenzene 114 050 100 ND 114 60-140 <br /> Xylenes(total) 360 050 300 ND 120 60-140 <br /> Surrogate a a a-Tris luorotoluene 946 100 95 60-140 <br /> Matrix Spike Dup(2060183-MSD1) Source 5206176-02 Prepared&Analyzed 06/14/02 <br /> Benzene 980 050 ug/l 100 ND 88 60-140 8 25 <br /> Toluene 10 8 050 100 ND 108 60-140 7 25 <br /> Ethylbenzene 12 2 0 50 100 ND 122 60-140 7 25 <br /> Xylenes(total) 382 050 300 ND 127 60-140 6 25 <br /> Surrogate a a a-Trifluorotoluene 106 100 106 60-140 <br /> equola Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page Page 7 of 9 <br />