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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 /> VWAnalytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 %00 FAX(916)921 Oleo <br /> Grown & Caldwell Client Project ID Arco 2133, Stockton <br /> 9616 Micron Ave , Suite 600 Matrix Water <br /> Sacramento, CA 95827 <br /> Attention Steve Misner QC Sample Group 512-0901 deported Jan 3, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Lead TRPH <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 200 7 EPA 418 1 <br /> Analyst: B Williams 8 Williams 8 Williams B Williams Chiaravalloti S Phllllps <br /> Concentration <br /> Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L 0 50 mg/L 4 0 mg/L <br /> LCS Batch# LCS122695 LCS122695 LCS122695 LCS122595 LCS121895 LCS 122895 <br /> Date Prepared 12/26/95 12/26/95 12/26/95 12/26/95 12/18/95 12/28/95 <br /> Date Analyzed. 12/26/95 12/26/95 12/26/95 12/26/95 12/19/95 12/28/95 <br /> Instrument I ❑ #- GCHP-2 GCHP-2 GCHP-2 GCHP-2 ICP-1 IR-11 <br /> . LCS <br /> Recovery 99 101 102 100 90 86 <br /> Control Limrts: 75-125 75 125 75-125 75-125 80-120 80-120 <br /> MS/MSD <br /> Batch# 5120846 5120846 5120846 5120846 5111817 BS122195 <br /> Date Prepared 12/26/95 12/26/95 12/26/95 12/26/95 12/18/95 12/21/95 <br /> Date Analyzed. 12/26/95 12/26/95 12/26/95 12/26/95 12/19/95 12/21/95 <br /> Instrument I D #. GCHP-2 GCHP 2 GCHP-2 GCHP-2 ICP-1 IR-1 <br /> Matrix Spike <br /> % Recovery: 98 97 99 100 100 90 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery* 95 98 99 97 92 90 <br /> Relative% <br /> Difference: 31 10 00 31 83 00 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matnx 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 flue to matnx effects the QC llmrts for MS/MSG's are advisory only <br /> Janet Man and are not used to accept or reject batch results <br /> Project Manager <br /> 5120901 SRS <4> <br />