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f - Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> 404 N Wigct lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento CA 95834 (916) 921-9600 FAX(916)921 0100 <br /> EMCON-Sac Project 1BC-Stockton Sampled 5/21/98 <br /> 1433 N Market Blvd Protect Number 22605-101001 Received 5122198 <br /> Sacramento,CA 95834 Project Manager Deanna Santos Reported 6/12198 <br /> Total Purgeable Hydrocarbons(C6-C12),BTEX and MTBE by DHS LUFT/Quality Control- <br /> Sequoia <br /> ontrolSequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch, 8060013 Date Prepared, 6/1198 Extraction Method. EPA 50308(P/Tl <br /> )lam{ 8060013-BLK1 <br /> Purgeable Hydrocarbons 6/1198 ND 119/1 500 <br /> Benzene It ND 0 500 <br /> Toluene It <br /> ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 <br /> Methyl tert-butyl ether ND 500 <br /> Surrogate a a,a-Trifluorotoluene 100 893 600-140 893 <br /> LCE 8060013-BS1 <br /> Benzene 611198 100 979 ug/l 700-130 979 <br /> Toluene " 100 906 700-130 906 <br /> 4Ee iizene100 888 700-130 888 <br /> s(total) 300 265 700-130 883 <br /> tert-butyl ether 10 0 118 700-130 118 <br /> Surrogate a,a,a-Trifluorotoluene 100 928 600-140 928 <br /> Matrix Spike 8060013-MSI 5805266-01 <br /> Benzene 6/1198 100 ND 101 ug/1 600-140 101 <br /> Toluene 11100 ND 925 04 600-140 925 <br /> Ethylbenzene Oftoo ND 9 13 600-140 91.3 <br /> Xylenes(total) 300 ND 273 600-140 910 <br /> Methyl tert-butyl ether 100 ND 120 600-140 120 <br /> Surrogate a,a,a-Trilluorotoluene 100 862 600-140 862 <br /> Matrix Spike ke bun 8060013-MSD! S805266-01 <br /> Benzene 6/1198 100 ND 105 ug/l 600-140 105 250 3 88 <br /> Toluene 100 ND 9 15 600-140 915 25 0 109 <br /> Ethylbenzene n100 ND 9 19 600-140 919 25 0 0 655 <br /> Xylenes(total) 300 ND 27 8 600-140 927 25 0 185 <br /> Methyl tert-butyl ether 100 ND 12 7 600-140 127 25 0 567 <br /> Surrogate a,a,a-Trifluorotoluene 100 856 600-140 856 <br /> 01 <br /> Sequoia Analytical-Sacramento 'Refer to end of report for test of notes and definitions <br /> /2-_,,1)2 �--' � <br /> Ronald W Bobel,Client Services Representative Page 4 of 6 <br />