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-Sequoia :a0 ChesaoeaKe Onve �edwooe C % Ca 94003 -15) 364 9600 eAX (415) 364'9233 <br /> '!(]Baees avenue !:utce L Concord CA 94i?0 10) 63o 9600 caX f510) 686 9089 <br /> -�nalvtieai o19 5cnKcrAvenue -Suite d �,icramenw L-k 95934 if61 921 9600 'AX (916) 921 0100 <br /> Brown & Caldwell Client Project ID Arco 2133-94-5 Stockton <br /> 9616 Micron Avenue Suite 600 Matrix Water <br /> Sacramento CA 95827 <br /> Attention Mindy Wright OC Sample Goup 407-0473 Reported Jul 26 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1 4-Dlohloro N-Nitroso DI- 1 2 4-Tnchioro- 4 Chloro-3- <br /> 1 Phenol 2 Chlorophenol benzene N oropyiamine benzene Methyl henvi <br /> ` Method EPA 8270 EPA 8270 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 6LK071694 BLK071694 BLK071694 OLK071694 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 7125/94 7/25/94 7/25/94 7/25/94 7/25/94 <br /> Instrument 1 D # GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 <br /> LCS <br /> Recovery se so 61 69 78 73 <br /> Control Llmrts: 12-89 27-123 36-97 41-116 39.98 23-97 <br /> ♦ �u ,v u.m.......u.. v t i.Yr�ry <br /> r r s..4.w$GwWi)vv N .0 S}vn <br /> MS/MSD <br /> Batch#: BLK071694 BLKC71694 OLKO71694�Btx071694�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 l D # GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 GC/MS i <br /> Matrix Spike <br /> % Recovery 58 60 61 69 78 73 <br /> Matrix 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 /> CA Gk validation of sample batch results Due to matrix effects the 13C limits for MS/MSD's are advisory only <br /> Craig C L�eand 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 />