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Sequoia 680 Chesapeake Drive Redwood Citv CA 94063 (4t5) 364 9600 FAX(415) 364-9233 <br /> Analytical 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Akri & Caldwell Client Project ID Arco 2133-95-5, Stockton <br /> Micron Ave , Suite 600 Matrix Air/Water <br /> Sacramento, CA 95827 <br /> Attention Steve Misner QC Sample Group 5100967-969 Reported Nov 7, 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 6010 <br /> Analyst: C Lee C Lee C Lee C Lee P Kent SO/CM <br /> Concentration <br /> Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L 4 0 mg/L 1 0 mg/L <br /> LCS Batch#' LCS102795 LCS102795 LCS102795 LCS102795 LCS110195 LCS103095 <br /> Date Prepared: 10/27/95 10/27/95 10/27/95 10/27/95 11/1/95 10/30/95 <br /> Date Analyzed: 10/27/95 10/27/95 10/27/95 10/27/95 11/1/95 11/2/95 <br /> Instrument 11.11) #: GCHP-2 GCHP-2 GCHP-2 GCHP-2 lR-1 MTJA-2 <br /> LCS % <br /> •� Recovery: 91 95 92 91 81 89 <br /> Control Limits: 75-125 75-125 75-125 75-125 80-120 75-125 <br /> MS/MSD <br /> Batch#' 13S102795 13S102795 BS102795 BS102795 BS110195 5101092 <br /> Date Prepared: 10/27/95 10/27/95 10/27/95 10/27/95 11/1/95 10/30/95 <br /> Date Analyzed: 10/27/95 10/27/95 10/27/95 10/27/95 11/1/95 11/2/95 <br /> Instrument I.D.#: (3CHP-2 GCHP-2 GCHP-2 GCHP-2 IR-1 MTJA-2 <br /> Matrix Spike <br /> % Recovery: 94 118 114 125 81 89 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 96 104 96 96 80 86 <br /> Relative% <br /> Difference: 21 13 17 26 12 34 <br /> SEQUOIA ANALYTICAL Please mote <br /> The LCS is a control sample of known,interferent free matrix that i9 analyzed using the same reagents, <br /> i 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/MSG's are advisory only <br /> Janet an and are not used to accept or re)eot batch results <br /> Project anager <br /> 5100967 BRS <6> <br />