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Sequoia 680 Chesapeake Drive Redwood Citv CA 94063 e4t5) 364 9600 FAX(415) 364-9233 <br /> 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 96W FAX(510) 686 9689 <br /> Analytical 319 Striker Avenue Suite 8 Sacramento CA 95834 916) 921 9600 FAX(916)921 0100 <br /> Brown & Caldwell Client Project ID Arco 2133 Stockton <br /> 9616 Micron Ave , Suite 600 Matrix Water <br /> Sacramento, CA 95827 <br /> Attention Mindy Patterson QC Sample Goup 504-0346 Reported Apr 21, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Oil 8t Grease Lead <br /> Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 FPA 418 1 EPA 200 7 <br /> Analyst: C Chapman C Chapman C Chapman C Chapman V Owens K Barta <br /> Concentration <br /> Spiked 10lrg/L 10 pg/L 10 ug/L 30 pg/L 4 0 mg/L 0 50 mg/L <br /> LCS Batch# LCSO41895 LCSO41895 LCSO41895 LCSO41895 LCSO42095 LCS041195 <br /> Date Prepared: 4/18/95 4/18/95 4/18/95 4/18/95 4/20/95 4/11/95 <br /> Date Analyzed: 4/18/95 4/18/95 4/18/95 4/18/95 4/21/95 4/17/95 <br /> Instrument I.D.#: GCHP-i GCHP-1 GCHP-1 GCHP-1 iR-1 P 40 <br />. LCS % <br /> Recovery: 94 97 94 96 92 104 <br /> Control Limits: 75-125 75-125 75-125 75-125 80-120 80-120 <br /> h.. 4 . . . Ura.. .. . M ,, .. Y, w s.'.�.. ...,. ,. ...v ., v 0 4,v .w..:vk .+J.csai•�w ..,. <br /> MS/MSD <br /> Batch#: 5040398 5040398 5040398 5040398 BLK041395 5040347 <br /> Date Prepared: 4/18/95 4/18/95 4/18/95 4/18/95 4/13/95 4/11/95 <br /> Date Analyzed: 4/18/95 4/18/95 4/18/95 4/18/95 4/14/95 4/17/95 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 IR-1 P 40 <br /> Matrix Spike <br /> % Recovery: 96 94 95 97 82 102 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- as 87 86 90 82 108 <br /> Relative% <br /> Difference: 11 77 9 9 7 5 0 0 38 <br /> 0 SEQUOIA ANALYTICAL Please Note <br /> 7 The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> //y� �/ ✓ � (�,/ preparation and analytical methods employed for the samples The LCS%recovery data Is used far <br /> validation of sample batch results Due to matrix effects,the OC limits for MS/MSD's are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager 5040346 BRS 44> <br />