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• Sequoia680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Anaiytiea1 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Iwor <br /> Upgradient Environmental Consultants Project Conrady Sampled 4124198 <br /> 336 Augusta Court Protect Number N/A Received 4/24/98 <br /> Valley Sp,CA 95252 Project Manager Vic Cherven Reported 5/13/98 <br /> Total Purgeable Hydrocarbons(C6-C12) and BTEX by DHS LUFT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> IAnalyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> US(continued) 8040224-BSI <br /> Ethylbenzene 4128198 10 0 937 ug/l 700-130 937 <br /> Xylenes(total) 300 279 700-130 93 0 <br /> Surrogate a a,a-Trifiuoratoluene 10 0 942 600-140 942 <br /> Matrix Spike 8040224-MS] S804230-02 <br /> Benzene 4/28/98 10 0 ND 10 8 ug/l 600-140 108 <br /> 'toluene 100 ND 10 1 600-140 101 <br /> Ethylbenzene 100 ND 970 600-140 970 <br /> Xylenes(total) 300 ND 28 8 600-140 960 <br /> Surrogate a a a-Tnfluorotoluene 100 966 or 600-140 966 <br /> Matrix Spike Dun 8040224-MSDI S804230-02 <br /> Benzene 4/28198 10 0 ND 107 ug/l 600-140 107 250 0 930 <br /> Oluene 10 0 ND 102 600-140 102 25 0 0 985 <br /> hylbenzene 10 0 ND 977 600-140 977 250 0 719 <br /> Xylenes(total) 300 ND 29 3 600-140 977 25 0 176 <br /> Surrogate a a a-Trnfluorotoluene 10 0 967 600-140 96 7 <br /> I <br /> Sequoia lytical-Sacramen *Refer to end of report for text of notes and definitions <br />• nda C Schneide ,Laboratory Director Page 7 of 10 <br />