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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 Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br />' Roy P Weston Client Project ICS SJCMVCb <br /> 2300 Clayton Rd , SUrte 1580 Matrix Water <br /> Concord, CA 94520-2148 <br /> Attention Carl Roner OC Sample Group 5090698-701 Reported Oct 6, 1995 <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 C Lee C Lee C Lee C Lee <br /> Concentration <br />' Spiked. 10pg/L 10Ng/L 10Ng/L 30f19/L <br /> LCS Batch#. LCS092795 LCS092795 LCS092795 LCS092795 <br /> Date Prepared: 9/27/95 9/27/95 9/27/95 9/27/95 <br /> Date Analyzed 9/27/95 9/27/95 9/27/95 9/27/95 <br /> Instrument I D #' GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery 106 105 105 105 <br /> Control Limits' 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # 5090701 5090701 5090701 5090701 <br /> ' Date Prepared 9/27/95 9/27/95 9/27/95 9/27/95 <br /> Date Analyzed. 9/27/95 9/27/95 9/27/95 9/27/95 <br /> Instrument I D # GCHP-2 GCHP 2 GCHP-2 GCHP-2 <br /> ' Matrix Spike <br /> %Recovery 101 99 100 100 <br /> ' Matrix Spike <br /> Duplicate <br /> Recovery 100 97 100 99 <br /> t Relative% <br /> Difference. 10 31 0 0 10 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LGS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> ���� L� preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> �!r �L 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 /> nit. t Manager <br /> 5090698 ROY <4> <br /> `6d' <br />