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i!D 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 819 Striker Avenue Suite 9 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> I(jeinfelder Client project IC) 20-3941-01 E01 <br /> 2825 East Myrtle St Matrix Soil <br /> Stockton, CA 95205 <br /> Attention Tony Martin QC 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# LCS070396 LCS070396 LCS070396 LCS070396 <br /> Date Prepared 07/03/96 07/03/96 07/03/96 07/03/96 <br /> Date Analyzed 07/03/96 07/03/96 07/03/96 07/03/96 <br /> Instrument I D # GCHP 1 GCHP t GCHP 1 GCHP 1 <br /> • LCS % <br /> R ecovery 88 93 94 95 <br /> Control Limits 75 125 75 125 75-125 75-125 <br /> I <br /> MS/MSD <br /> Batch # 6061088 6061088 6061088 6061088 <br /> Date Prepared 07/03/96 07/03/96 07/03/96 07/03/96 <br /> Date Analyzed 07/03/96 07/03/96 07/03/96 07/03/96 <br /> Instrument I D # GCHP 1 GCHP-1 GCHP-1 GCHP 1 <br /> Matrix Spike <br /> Recovery 92 94 94 95 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 98 1 97 96 96 <br /> Relative% <br /> Difference* 63 31 21 1 0 <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 /> C validation of sample batch results Due to matrix effects,the QC limits for MS/MSDs are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labors ory <br /> 6060973 KLF <15> <br />