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' Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(654)364 9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Upgradient Client Project 1C7 Vajfey Motors <br /> 3369 Kimberly Rd Matrix Air <br /> Cameron Park, CA 95682 <br /> Attention Clyde Hebbrom CC Sample Group 803-0333 Reported Mar 24, 1998 <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked 2 0 mg/m3 2 0 mg/m3 2 0 mg/m3 6 0 mg/m3 <br /> LCS Batch# LCSG31098 LCS031098 LCS031098 LCS031098 <br /> Date Prepared 03/10/98 03/10/98 03/10/98 03/10/98 <br /> Date Analyzed: 03/10/98 03/10/98 03/10/98 03/10/98 <br /> Instrument I D.#: GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> LCS % <br /> Recovery 95 93 92 91 <br /> Control Limits, 70130% 70-130% 70-130% 70-130% <br /> MS MSD <br /> Batch # BS031098 BS031098 DS031098 BS031098 <br /> Date Prepared 03/10/98 03/10/98 03/10/98 03/10/98 <br /> Date Analyzed 03/10/98 03/10/98 03/10/98 03/10/98 <br /> Instrument I D.#. GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Matrix Spike <br /> % Recovery. 95 93 92 91 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 96 93 92 92 <br /> Relative% <br /> Difference: 10 00 00 1 1 <br /> SEQUOIA ANALYTIC Please Note <br /> 'the LCS is a control sample of known,Interferent free matrix that is analyzed using the sarne reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data Is used for <br /> validation of sample batch results Due to matrix effects,the OC limits for MS/MSD's are advisory only <br /> Inda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory <br /> 78030333 UPG <2> <br />