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v4D Sequoia n80 Chesaoeake Drive Redwood Cav CA 94063 1415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane tXainut CreeK CA 94598 510) 988 9600 FAX(510) 988 9673 <br /> rraO Analytical 319 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> • 8rown & Caldwell Client Prolect ID Arco 2133 Stockton <br /> 9616 Micron Ave , Suite 600 Matrix Air <br /> Sacramento CA 95827 <br /> Attention Mindy Patterson QC Sample Group 5070224-225 Reported Jul 17, 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. 2 0 ppmv 2 0 ppmv 2 0 ppmv 6 0 ppmv <br /> LCS Batch## LCS071195 LCS071195 LCS071195 LCS071195 <br /> Date Prepared 7/11/95 7/11/95 7/11/95 7/11/95 <br /> Date Analyzed: 7/11/95 7/11/95 7/11/95 7/11/95 <br /> Instrument I D #- GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS ',6 <br /> Recovery: 98 98 98 99 <br /> Control Limits. 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch#: SS071195 SS071195 SS071195 BS071195 <br /> Date Prepared: 7/11/95 7/11/95 7/11/95 7/11/95 <br /> Date Analyzed: 7/11/95 7/11/95 7/11/95 7/11/95 <br /> Instrument I D #: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> %Recovery: 98 98 98 99 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 97 96 97 96 <br /> Relative% <br /> Difference: 10 21 10 31 <br /> SEQUOIA ANALYTICAL Please Mote <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> / G,.�(r� preparation and analytical methods employed for the samples The LCS%recovery data 1s used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSD s are advisory only <br /> Janet rlan and are not used to accept or reject batch results <br /> Project Manager <br /> 5070224 SRS <3> <br />