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_ Sequoia 690 Chesapeake Drive Redwooa City CA 94063 14151 364 9600 FAX (415) 364 9133 <br /> . 404 N W1gct Lane Walnut Crcck CA 94598 (5101 988 9600 FAX(510) 988 9673 <br /> 1460 Analytical 919 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9,500 FAX (916)921 0100 <br /> Brown & Caldwell Client Project ID Arco 2133 Stockton <br /> 9616 Micron Ave , Suite 600 Matrix Air <br /> Sacramento, CA 95827 <br /> Attention Mindy Patterson OC Sample Group 5070224-225 Reported Jul 17, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> i <br /> ANALYTE Ethyt- <br /> Benzene Toluene Benzene Xyienes <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# LCS071095 LCS071095 LC8071095 LCS071095 <br /> Date Prepared 7/10/95 7/10/95 7/10/95 7/10/95 <br /> Date Analyzed. 7/10/95 7/10/95 7/10/95 7/10/95 <br /> Instrument I D.# GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS '/a <br /> Recovery: 96 96 98 97 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch#" BS071095 SS071095 SS071095 SS071095 <br /> Date Prepared: 7/10/95 7/10/95 7/10/95 7/10/95 <br /> Date Analyzed: 7/10/95 7/10/95 7/10/95 7/10/95 <br /> Instrument LD #: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery- 96 96 98 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 94 95 98 99 <br /> Relative% <br /> Difference: 21 10 00 2 0 <br /> SEQUOIA ANALYTICAL Please(vote <br /> The LCS is a control sample of known,interferent free matrix that 1s 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 a and are not used to accept or relect batch results <br /> ProlecVManager <br /> 5070224 BRS <2> <br />