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t} Sequoia o80 Chesapeake Drive Redwood City CA 94063 (-t 15) 364 9600 FAX(415) 364 9233 Analytical 1900 Bates Avenue Suite L Concord CA 94520 510) 686 9600 FAX(510)686 9689 819 Striker Avenue 3uue 8 Sacramento CA 95634 1916) 921 9600 FAX (916)921 0100 Brown & Caldwell Client Project ID Arco 2133-94-5, Stockton 9616 Micron Avenue, Suite 600 Matrix Water Sacramento, CA 95827 Attention Mindy Wright QC Sample Goup 407-0473 Reported Jul 26, 1994 QUALITY CONTROL DATA REPORT ANALYTE 24-Dinitro- Penta- Acenaphthene 4-Nitrophenol toluene chlorophenol_ Pyrene Method EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 Analyst K Lee K Lee K Lee K Lee K Lee Concentration Spiked 100 ug/L 100 ug/L 100 ug/L 100 ug/L 100 ug/L LCS Batch# BLK071594 BLK071694 BLK071694 BLK071694 BLK071694 Date Prepared- 7/16/94 7/16/94 7/16/94 7/16/94 7/16/94 Date Analyzed' 7/25/94 7/25/94 7/25/94 7/25/94 7/25/94 Instrument I.D # GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 LCS % Recovery: 69 58 67 51 84 Control Limits: 46-118 10-80 2496 9.103 26-127 1 3 r r n rr MS/MSD Batch#: BLK071694 BLK071694 BLK071694 BLK071694 BLK071694 Date Prepared: 7/16/94 7/16/94 7/16/94 7/16/94 7/16/94 Date Analyzed: 7/25/94 7/25/94 7/25/94 7/25/94 7/25/94 Instrument 1 D.#. GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 Matrix Spike % Recovery 69 58 67 51 84 Matrix Spike Duplicate% Recovery- 89 72 84 61 105 Relative% Difference- 25 21 22 18 22 SEQUOIA ANALYTICAL Pfease Note The LCS is a control sample of known,Interferent free matrix that Is analyzed using the same reagents, CA Q, C preparation and analytical methods employed for the samples The LCS%recovery data is used for validation of sample batch results Due to matrix effects,the GC limits for MS/MSD's are advisory only Craig CDie and are not used to accept or reject batch results Project Manager Page 2 of 2 4070473 BRS <12>