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SeQuoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> Sequoia <br /> 1 Wiget Lane Walnut Creek CA 94598 (510) 988 96W FAX(510)988 9673 <br /> frlll>� Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Kleinfelder Client Project ID 20-3941-01 501 <br /> 2825 East Myrtle St Matrix Soli <br /> Stockton, CA 95205 <br /> Attention Tony Martin OC Sample Group 606091 9-1 00 1 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 B Williams B Williams B Williams B Williams <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# LCS062696 LCS062696 LCS062696 LCS062696 <br /> ' Date Prepared 06/26/96 06/26/96 06/26/96 06/26/96 <br /> Date Analyzed 06/26/96 06/26/96 06/26/96 06/26/96 <br /> Instrument I D #- GCHP-1 GCHP-1 GCHP-1 GCHP 1 <br /> LCS <br /> Recovery 96 102 104 105 <br /> ' Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch# 6060929 6060929 6060929 6060929 <br /> ' Date Prepared: 06/26/96 06/26/96 06/26/96 06/26/96 <br /> Date Analyzed 06/26/96 06/26/96 06/26/96 06/26/96 <br /> Instrument 1 D # GCHP 1 GCHP 1 GCHP-1 GCHP-1 <br /> ' Matrix Spike <br /> % Recovery 84 88 89 92 <br /> Matrix Spike <br /> r Duplicate% <br /> Recovery 89 92 95 97 <br /> ' Relative% <br /> Difference` 5 8 44 65 5 3 <br /> SEQUOIA ANALYTICA Please Note <br /> The LCS 1s a control sample of known,interferent free matrix that Is analyzed using the same reagents, <br /> c ���G, 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 IVIS/MSG's are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labora vey <br /> 6060973 KLF <11> <br /> i <br />