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819 Sinker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> Sequoia (916)921-9600 <br /> FAX(916)921-0100 <br /> Analytical www scquoialabs com <br /> elta E VlronMcrttal Consultants(Cameron Park) Project ARCO 2186, Stockton,CA <br /> 3330 Cameron Park Dr Ste 550 Pr4lectNumber 2186,Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Steve Carter 04/25/02 09 59 <br /> Total Purgeable Hydrocarbons and BTEX by DHS LUFT - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2030245-EPA 5030B(PIT) <br /> Blank(2030245-BLK1) Prepared&Analyzed 03/19/02 <br /> Purgeable Hydrocarbons ND 50 ug/1 <br /> Benzene ND 0 50 <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate a a a-Trifluorotoluene 892 100 892 60-140 <br /> LCS(2030245-BSI) Prepared&Analyzed 03/19/02 <br /> Benzene 8 03 050 ug/l 100 803 70-130 <br /> Toluene 794 050 100 794 70-130 <br /> Ethylbenzene 850 0 50 100 85 0 70-130 <br /> Xylenes(total) 248 050 30 0 827 70-130 <br /> �rrogate a a,a-Trifluorotoluene 860 100 86 0 60-140 <br /> atrix Spike(2030245-MS1) Source 5203225-02 Prepared&Analyzed 03/19/02 __ <br /> Benzene 8 76 050 ug/l 100 ND 876 60-140 <br /> Toiuene 8 62 050 100 ND 962 60-140 <br /> Ethylbenzene 9 42 0 50 100 ND 942 60-140 <br /> Xylenes(total) 270 0 50 300 ND 900 60-140 <br /> Surrogate a a a-Trifluorotoluene 9 43 100 943 60-140 <br /> Matrix Spike Dup(2030245-MSD1) Source 5203225-02 Prepared&Analyzed 03/19/02 <br /> Benzene 890 050 ug/l 10 0 ND 890 60-140 l 59 25 <br /> Toluene 854 0 50 10 0 ND 854 60-140 0 932 25 <br /> Ethylbenzene 9 21 0 50 100 ND 921 60-140 225 25 <br /> Xylenes(total) 266 0 50 300 ND 88 7 60-140 1 49 25 <br /> Surrogate a a a-Tris luorotoluene 9 84 100 98 4 60-140 <br /> quota Analytical - Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document 7hts analytical report must be reproduced in its entirety <br /> Page Page 8 of 13 <br />