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' Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut C eek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Strtkcr Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Kleinfelder Client Project ID 20-11290 <br /> 2825 East Myrtle St Matrix Water <br /> Stockton, CA 95205 <br /> Attention Roman Racca QC Sample Group 705-0607 Reported Jun 3, 1997 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> 1 <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 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> ' LCS Batch#. LCS052797 LCS052797 LCS052797 LCS052797 <br /> ' Date Prepared 05/27/97 05/27/97 05/27/97 05/27/97 <br /> Date Analyzed 05/27/97 05/27/97 05/27/97 05/27/97 <br /> Instrument I D#• GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> LCS % <br /> Recovery 93 94 95 95 <br /> ' Control Limits 70-130 70-130 70-130 70-130 <br /> ' MS/MSD <br /> Batch# 7050607 7050607 7050607 7050607 <br /> ' Date Prepared 05/27/97 05/27/97 05/27/97 05/27/97 <br /> Date Analyzed 05/27/97 05/27/97 05/27/97 05/27/97 <br /> Instrument I D.# GCHP 7 GCHP-7 GGHP-7 GCHP-7 <br /> ' Matrix Spike <br /> % Recovery 89 92 92 92 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 94 97 97 97 <br /> ' Relative% <br /> Difference 55 53 53 53 <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 /> A M 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/MSDs are advisory only <br /> rEdana M Fruciano 1 and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory <br /> 1 7050607 KLF <6> <br />