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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> Sequoia <br /> 404 N Wiget Lane Walnut Creck CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 %00 FAX(916)921 0100 <br /> Kleinfelder Client Project ID 20-3941-01 E01 <br /> 2825 East Myrtle St Matrix Sod <br /> Stockton, CA 95205 <br /> Attention Tony Martin QC Sample Group 6060919-1001 Reported Jul 10, 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 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-1 GCHP-1 GCHP-1 <br /> LCS <br /> Recovery 88 93 94 95 <br /> IControl Limits 75-125 75-125 75 125 75-125 <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 /> Intarument 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 97 96 96 <br /> Relative% <br /> Difference 63 31 21 10 <br /> SEQUOIA ANALYTICAL _ Please Note <br /> The LCS is a control sample known,interferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods <br /> 96hods 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 /> Linda C Schneider and are not used to accept or reject batch results <br /> ' Project Manager/Sacramento Labor-so-Ty <br /> ' 6060973 KLF <15> <br />