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Sequoia 630 Chesapeake Dnve Redwood City CA 94063 (415) 364 96W FAX(415) 364 9233 <br /> 404 N Wigec Lane Walnut Creek CA 94598 (510) 988 9600 FAX(S10)988 9673 <br /> Analytical 319 Sinker Avenue Suite 8 Sacramento CA 95834 (916Y 921 9600 FAX(916) 921 0100 <br /> Brown &Caldwell Client Project ID Arco 2133, Stockton <br /> 9616 Micron Ave , Suite 600 Matrix Water <br /> Sacramento, CA 95827 <br /> Attention Steve Misner OC Sample Group 601-1129 Reported Feb 20, 1996 <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 B w/C C B w/C C BW/CC BW/CC <br /> Concentration <br /> Spiked. 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS020296 LCS020296 LCS020296 LCS020296 <br /> Date Prepared 02/02/96 02/02/96 02/02/96 02/02/96 <br /> Date Analyzed- 02/02/96 02/02/96 02/02/96 02/02/96 <br /> Instrument I D # GCHP 2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> • Recovery 104 104 106 108 <br /> Control Limits 75-125 75 125 75-125 75 125 <br /> MS/MSD <br /> Batch # 6011096 6011096 6011096 6011096 <br /> Date Prepared 02/02/96 02/02/96 02/02/96 02/02/96 <br /> Date Analyzed 02/02/96 02/02/96 02/02/96 02/02/96 <br /> Instrument I D # GCHP 2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery- 102 100 103 104 <br /> Matrix Spike <br /> Duplicate <br /> Recovery- 93 92 97 95 <br /> Relative % <br /> Difference, 9 2 83 6 0 90 <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 /> preparation and analytical methods employed for the samples The LCS%recovery data 1s used for <br /> *C<L ( validation of sample batch results Due to matrix effects,the OC limits for MS/MSD's are advisory only <br /> Janet Harlan and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory <br /> 6011129 BRS a4> <br />