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Ci) <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364-9233 <br /> C,i1 Analytical 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 %73 <br /> J 819 Stoker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Brown &-Caldwell <br /> Client Protect 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 5100967-969 Reported Nov 7 1995 <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. C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked. 2 0 mg/m3 2 0 mg/m3 2 0 mg/m3 6 0 mg/m3 <br /> LCS Batch# LCS102695 LCS102695 LCS102695 LCS102695 <br /> Date Prepared- 10/26/95 10/26/95 10/26/95 10/26/95 <br /> Date Analyzed: 10/26/95 10/26/95 10/26/95 10/26/95 <br /> Instrument I.D.# GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS <br /> Recovery: 90 88 91 92 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> t + '^ t o f v n v ++n ry 4 ry + v x f.w + ! r v ++t vt v �: v f rc •f. <br /> + + ♦v v 4"^ r v+ of v}nvv v3nv vhY + 4.v <br /> MS/MSD <br /> Batch #- BS102695 BS102695 BS102695 BS102695 <br /> Date Prepared: 10/26/95 10/26/95 10/26/95 10/26/95 <br /> Date Analyzed: 10/26/95 10/26/95 10/26/95 10/26/95 <br /> Instrument I.D.#* GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery: 90 88 91 92 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 85 86 87 87 <br /> Relative% <br /> Difference: 5 7 23 45 56 <br /> SEQUOIA ANALYTICAL Please(vote <br /> The LCS is a control sarin pie 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 is used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Jane arlan and are not used to accept or re)ect batch results <br /> Prole t Manager <br /> 5100967aRS <5> <br />