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' Sequoia Y <br /> P uoia 680 Chesapeake Drive Redwood Cit CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1 <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 /> I <br /> Ground hero Analysis Client tsroject Ib 95-006/ Knowles J ltoek <br /> 3422 W Hammer Lane, #C-294 Matrix Air <br /> Stockton, CA 95219 <br /> Attention Justin Power OC Sample Group 5100549-551 Reported Oct 17, 1995 <br /> ' QUALITY CONTROL DATA REPORT <br /> I <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Concentration <br /> i <br /> Spiked 2 0 mg/m3 2 0 mg/m3 2 0 mg/m' 6 0 mg/m' <br /> I <br /> LCS Batch#. LC8101395 LCS101395 LCS101395 LC8101395 <br /> I <br /> Date Prepared 10/13/95 10/13/95 10,113/95 10/13/95 <br /> Date Analyzed 10/13/95 10/13/95 10,113/95 10/13/95 <br /> Instrument I D # GCHP 2 GCHP 2 GCHP 2 GCHP 2 <br /> I <br /> LCS % <br /> Recovery 103 102 101 101 <br /> Control Limits 75.125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch# BS101395 BS101395 BS101395 BS101395 <br /> Date Prepared 10/13/95 10/13/95 10/13/95 10/13/95 <br /> Date Analyzed' 10/13/95 10/13/95 10/13/95 10/13/95 <br /> Instrument l.D.#. GCHP-2 GCHP-2 GCHP-2 GCHP 2 <br /> Matrix Spike <br /> %Recovery 103 102 101 101 <br /> G <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 88 88 94 92 <br /> Relative% <br /> Difference 16 15 T2 9 3 <br /> EOUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known Interferent tree 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 /> validation of sample batch results Due to matrix effects the QC limits for MS/MSD's are advisory only <br /> Janet flan and are not used to accept or reject batch results <br /> Pro)ec anager <br /> 5100549 GZA <2> <br /> C � <br />