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Sequoia 680 ChesapeaKe Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> Analytical 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX (510)686 9689 <br /> 819 Straker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> rown &Caldwell Client Project ID Arco 2133-94-5, Stockton <br /> 616 Micron Avenue Suite 600 Matrix Water <br /> Sacramento, CA 95827 <br /> Attention Mindy Wright QC Sample Goup 407-0473 Reporter! Jul 26, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 14-Dichioro- N-Nitroso-Di- 1,2,4-Trichloro- 4-Chloro-3- <br /> Phenol 2-Chloro henol benzene N-propyiamine benzene Meth ! hen I <br /> Method EPA 8270 EPA 6270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 <br /> Analyst: K Lee K Lee K Lee K Lee K Lee K Lee <br /> Concentration <br /> Spiked 200 ug/L 200 ug/L 100 ug/L 100 ug/L 100 ug/L 200 ug/L <br /> LCS Batch# BLK071694 BLK071694 BLK071694 SLK071694 BLK071694 BLK071694 <br /> Date Prepared 7/16/94 7/16/94 7/16/94 7/16/94 7/16/94 7/16/94 <br /> Date Analyzed. 7/25/94 7/25/94 7/25/94 7/25/94 7/25/94 7/25/94 <br /> Instrument I.D.# GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 <br /> LCS % <br /> Recovery: 58 60 61 69 78 73 <br /> Control Limits: 12-89 27-123 36.97 41-116 39-98 23-97 <br /> ++4 vC �5YASa nim + + x <br /> MS/MSD <br /> Batch#: BLK071694 BLK071694 BLK071694 BLK071694 BLK071694 eLK071694 <br /> Date Prepared: 7/16/94 7/16/94 7/16/94 7/16/94 7/16/94 7/16/94 <br /> Date Analyzed: 7/25/94 7/25/94 7/25/94 7/25/94 7/25/94 7/25/94 <br /> Instrument I.D.#: GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 GC/M$1 GC/MS 1 <br /> Matrix Spike <br /> %Recovery' 58 60 61 69 78 73 <br /> Matnx Spike <br /> Duplicate% <br /> Recovery- 75 77 78 88 100 95 <br /> Relative % <br /> Difference 26 25 24 25 25 26 <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is 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 is used for <br /> validation of sample batch results Due to matrix effects,the OC limits for MS/MSD's are advisory only <br /> and are not used to accept or reject batch results <br /> Craig C L e <br /> Project Manager Page 1 of 2 <br /> 4070473 BRS <11> <br />