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' Sequoia 10 680 Chesapeake Drive Redwood City,CA 94* (415) 364 9600 FAX(41$) 364 9233 <br /> ,WD404 N 'get Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 0 Analytical 819 Striker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> kupgradient Client Project Ib Apache <br /> ' 1017 26th St Matrix Water <br /> Sacramento, CA 95816 <br /> Attention Vic Cherven QC Sample Group 606-0859 Reported Jul 1, 1996 <br /> 1 <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 V Owens V Owens V Owens V Owens <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> ' LCS Batch# LCS062896 LCS062896 LCS062896 LCS062896 <br /> Date Prepared 06/28/96 06/28/96 06/28/96 06/28/96 <br /> ' Date Analyzed 06/28/96 06/28/96 06/28/96 06/28/96 <br /> Instrument I D# GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS <br /> Recovery sa 92 102 99 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> ' MS/MSD <br /> Batch# 6061135 6061135 6061135 6061135 <br /> Date Prepared 06/28/96 06/28/96 06/28/96 06/28/96 <br /> ' Date Analyzed 06/28/96 06/28/96 06/28/96 06/28/96 <br /> Instrument I D# GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 90 93 97 93 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 92 97 101 102 <br /> ' Relative% <br /> Difference 22 42 a0 92 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same 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/MSDs are advisory only <br /> Margie Namba and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory <br /> 6060859 UPS <2> <br /> 1 <br />