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Sequoia 680 Chesapeake Dnve Redwood C,CA 94063 (415) 364-9600 FAX(415) 364-9233 <br /> 19oo Hates Avenue Suite L Concord,CA 94520 (510) 686-9600 FAX(510)686.9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> r w <br /> r6gro West, Inc Client Project ID Shell, 141 N Ei Dorado, Stockton, CA <br /> 1050 Melody Lane, Ste 160 Matrix Water/Air <br /> Roseville, CA 95678 <br /> Attention Sudhakar Talanki CC Sample Group 5040530-533 Reported Apr 26, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 9020 <br /> Analyst' C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked: 2 0 mg/m3 2 0 mg/m' 2 0 mg/rr11 6 0 mg/m3 <br /> LCS Batch#' LCSO41395 LCSO41395 LCSO41395 LC8041395 <br /> Date Prepared: 4/13/95 4/13/95 4/13/95 4/13/95 <br /> Date Analyzed: 4/13/95 4/13/95 4/13/95 4/13/95 <br /> Instrument I.D.#• GCHP 2 GCHP-2 GCHP-2 GCHP 2 <br /> iLCS % <br /> Recovery- 96 96 96 95 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch ##- BLK041395 ELK041395 BLK041395 SLK041395 <br /> Date Prepared: 4/13/95 4/13/95 4/13/95 4/13/95 <br /> Date Analyzed: 4/13/95 4/13/95 4/13/95 4/13/95 <br /> Instrument l.D.#. GCHP 2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery- 96 96 96 95 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 97 97 9T 97 <br /> Relative% <br /> Difference: 10 10 10 21 <br /> �EQUOIA ANALYTICAL Please mote <br /> The LCS is a control sample of known interferent free matnx that is analyzed using the same reagents, <br /> 1 <br /> ^ �_ preparation and analytical methods employed for the samples The LCS%recovery ata is us or <br /> �} j •� L validation of sample batch results ©ue to matrix effects,the QC limits for MS/MSO s are advisory only <br /> Linda C Schneider Lr and are not used to accept or reject batch results <br /> Project Manager <br /> 5048530 FllCi <8> <br />