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819 Striker Avenue,Suite 8 <br /> nto,CA 5834 <br /> Sequoia Sacram(916)92199600 <br /> FAX(916)921-0100 <br /> Analytical www scquoialabs corn <br /> elta Envtronmenta]Consultants(Cameron Park) Project ARCO 2186,Stockton,CA <br /> 3330 Cameron Park Dr Ste 550 Project Number 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 STPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2030249-EPA 5030B{P/T) <br /> Blank(2030249-BLKI) Prepared&Analyzed 03/19/02 <br /> Purgeable Hydrocarbons ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate a a a-Trifluorotoluene 976 100 976 60-140 <br /> LCS(2030249-BS1) Prepared&Analyzed 03/19/02 <br /> Benzene 907 050 ug/l 100 907 70-130 <br /> Toluene 954 050 100 954 70-130 <br /> Ethylbenzene 968 050 100 968 70-130 <br /> Xylenes(total) 29 8 050 300 993 70-130 <br /> skurrogate a a a-Trifluorotoluene 103 100 103 60-140 <br /> atrix Spike(2030249-MSI) Source 5203224-02 Prepared&Analyzed 03/19/02 <br /> Benzene 9 19 050 ug/l 100 ND 91 9 60-140 <br /> Toluene 9 65 050 100 ND 965 60-140 <br /> Ethylbenzene 9 82 050 100 ND 98 2 60-140 <br /> Xylenes(total) 302 0 50 300 ND 101 60-140 <br /> Surrogate a a a-Trivarotoluene 906 100 906 60-140 <br /> Matrix Spike Dup(2030249-MSDI) Source S203224-02 Prepared&Analyzed 03/19/02 <br /> Benzene 892 050 ug/l 100 ND 892 60-140 298 25 <br /> Toluene 940 050 100 ND 940 60-140 262 25 <br /> Ethylbenzene 9 38 050 100 ND 93 8 60-140 4 58 25 <br /> Xylenes(total) 295 050 300 ND 98 3 60-140 2 35 25 <br /> Surrogate a a a-Trifluorotoluene 8 93 100 893 60-140 <br /> quota Analytical - Sacramento The results in this report apply to the samples analyzed in accordance with the chain o/ <br /> custody document This analytical report must be reproduced in its entirety <br /> Page Page 9 of 13 <br />