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Ci) Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415)364 9233 <br /> • 404 N Wiget lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Kieinfelder Client Project Ib 20-3941-01 I;01 <br /> 2825 East Myrtle St Matrix Sall <br /> Stockton, CA 95205 <br /> Attention Tony Martin OC Sample Group 6060919-1001 Reported Jul 10, 1996 <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 CL/BW CL/BW CL/BW CL/BW <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# LCS062896 LCS062896 LCS062896 LCS062996 <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 05/28/96 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> • LCS <br /> Recovery 86 91 100 100 <br /> Control Limits 75-125 75 125 75 125 75-125 <br /> MS/MSD <br /> Batch # 6060973 6060973 6060973 6060973 <br /> Date Prepared 06/26/96 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-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery 71 81 88 90 <br /> Matrix Spike <br /> Duplicate <br /> Recovery 86 88 86 88 <br /> Relative% <br /> Difference 19 83 23 22 <br /> EQUOIA 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 QC limits for MS/MSD's are advisory only <br /> i d C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labors ory <br /> 6050973 KLF <13> <br />