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ti <br /> Sequoia 819 Striker Avenue Suite 8 <br /> Sacramento CA 95834 <br /> 4 a- ) (916)921-9600 <br /> FAX(916)921-0100 <br /> Analytical www sequoialabs cam <br /> OW <br /> IT Corporation-Sacramento Project Parkinson's ARCO, Stockton <br /> 1433N Market Blvd,Ste 1 Project Number 880-040 1A/01060000 Reported <br /> Sacramento CA,95834 Project Manager Kathleen Waldo 05/02/01 11 43 <br /> Total Purgeable Hydrocarbons (C6-C12) 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 1040295-EPA 5030B(P/T <br /> Blank(1040295-BLK1) Prepared&Analyzed 04/24/01 <br /> Purgeable Hydrocarbons ND 500 ugtl <br /> Benzene ND 0 500 " <br /> Toluene ND 0 500 " <br /> Ethylbenzene ND 0 500 " <br /> Xylenes(total) ND 0 500 " <br /> Surrogate a a,a-Tr fluorotoluene 102 100 102 60-140 <br /> LCS(1040295-BS1) Prepared&Analyzed 04/24/01 <br /> Benzene 103 0 500 ugll 100 103 70-130 <br /> Toluene 103 0 500 too 103 70-130 <br /> (benzene 102 0 500 100 102 70-130 <br /> nes(total) 307 0 500 300 102 70-130 <br /> Surrogate a a a-Trifluorotoluene 9 75 100 975 60-140 <br /> Matrix Spike(1040295-MSI) Source 5104288-08 Prepared&Analyzed 04/24/01 <br /> Benzene 102 0 500 ug/I 100 ND 102 60-140 <br /> Toluene 101 0 500 100 ND 101 60-140 <br /> Ethylbenzene 102 0 500 100 ND 102 60-140 <br /> Xylenes(total) 30 1 0 500 300 ND 100 60-140 <br /> Surrogate a,o a-Trruorotoluene 105 100 105 60-140 <br /> Matrix Spike Dup(1040295-MSD1) Source S104288-08 Prepared&Analyzed 04/24/01 <br /> Benzene 102 0 500 ug/l 10 0 ND 102 60-140 0 25 <br /> Toluene 101 0 500 " 10 0 ND 101 60-140 0 25 <br /> Ethylbenzene 102 0 500 10 0 ND 102 60-140 0 25 <br /> Xylenes(total) 302 0 500 300 ND 101 60-140 0 332 25 <br /> Surrogate a a,a-Triuorotoluene 103 100 103 60-140 <br /> quota Analytical- Sacramento The results in this report apply to the samples analyzed to accordance with the chain of <br /> custody document This analytical report must be reproduced to its entirety <br /> Page 5 of 10 <br />