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Sequoia o8u Chesapeake Drive Redwood City CA 94063 4151 364 9600 FAX(415) 364 9233 <br /> 404 N Wev,et Lane `b'alnut Crtek CA `J4598 'If)) 914 96W FAX (5 10) 988 9673 <br /> I,� Analytical 819 Striker Avenue butte 8 Sacramento (A 95834 )161 921 96110 FAX 19161 921 0100 <br /> Grown & Caldwell Client Project ID Arco 2133-95-5, Stockton <br /> 9616 Micron Ave Suite 600 Matrix Air / Water <br /> Sacramento, CA 95827 <br /> Attention Steve Misner OC Sample Group 5110995-97 Reported Dec 6 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes TRPH Lead <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 418 1 EPA 200 7 <br /> Analyst. B Williams B Williams B Williams B Williams S Phillips K Barta <br /> Concentration <br /> Spiked 2 0 mg/mJ 2 0 mg/m3 2 0 mg/m, 6 0 mg/ml 4 0 mg/L 0 50 mg/L <br /> LCS Batch# LCS111795 LCS111795 LCS111795 LCS111795 LCS 112895 LCS 1121956 <br /> Date Prepared: 11/17/95 11/17/95 11/17/95 11/17/95 11/28/95 11/21/95 <br /> Date Analyzed- 11/17/95 11/17/95 11/17/95 11/17/95 11/29/95 12/4/95 <br /> Instrument I D #- GCHP-2 GCHP-2 GCHP-2 GCHP-2 IR-1 ICP-1 <br /> LCS % <br /> • Recovery 90 90 92 90 97 98 <br /> Control Limits: 75-125 75-125 75-125 75-125 80-120 80-120 <br /> MS/MSD <br /> Batch # BS111795 BS111795 BS111795 BS111795 BS112895 5111096 <br /> Date Prepared 11/17/95 11/117/95 11/17/95 11/17/95 11/28/95 11/21/95 <br /> Date Analyzed. 11/17/95 11/17/95 11/17/95 11/17/95 11/29/95 12/4/95 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 IR-1 ICP-1 <br /> Matrix Spike <br /> % Recovery- 85 90 90 92 97 96 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 80 85 85 88 93 96 <br /> Relative % <br /> Difference 61 57 57 5 6 4 2 00 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS 1s 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 /> validation of sample batch results Due to matrix effects the QC limits for MS/MSD's are advisory only <br /> Janet an and are not used to accept or reject batch results <br /> Prolec anager <br /> 5110995 SRS <5> <br />