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Q Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue Suitt L Concord CA 94520 1,510) 666 9600 FAX(5 10) 686 9689 <br /> Analytical 8t9 Smker Avenue Suite 8 Sacramento CA 95834 (9t6) 921 9600 FAX (916) 921 0100' <br /> Brown & Caldwell Client Project ID Arco 2133-95-5, Stockton <br /> 9616 Micron Ave , Suite 600 Matrix Water <br /> Sacramento CA 95827 <br /> Attention Mindy Patterson QC Sample Group 501-0311 Reported Jan 26, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br />' Cadmium Chromium Lead Nickel Zinc Oil&Grease Mercury <br /> Method EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 413 1 EPA 7470 <br /> Analyst K Barta K Barta K Sarta K 8arta K Barta L Settencourt D Ballard <br /> Concentration <br /> Spiked 0 50 mg/L 0 50 mg/L 0 50 mg/L 0 50 mg/L 0 50 mg/L 50 mg/L 0 0050 mg/L <br /> LCS Batch# LCS011395 LCS011395 LCS011395 LCS011395 LCS011395 LCS012095 LCS011795 <br /> Date Prepared 1/13/95 1/13/95 1/13/95 1/13/95 1/13/95 1/20/95 1/17/95 <br /> Date Analyzed 1/17/95 1/17/95 1/17/95 1/17/95 1/17/95 1/20/95 1/17/95 <br /> Instrument I D # P 40 P-40 P 40 P 40 P 40 BAL 4 SH-1000 <br /> LCS % <br /> Recovery 96 103 99 104 101 98 93 . <br /> Control Limits 80-120 80-120 80.120 80-120 80-120 75 125 80-120 <br /> MS/MSD <br /> Batch # 5010323 5010323 5010323 5010323 5010323 BLK012095 5010311 <br /> Date Prepared 1/13/95 ___ 1/13/95 1/13/95 - 1/13/95 - - 1/13/95 1/20/95 -1/17/95 -- - <br /> Date Analyzed 1/17/95 1/17/95 1/17/95 1/17/95 1/17/95 1/20/95 1/17/95 <br /> Instrument I D # P-40 P-40 P 40 P 40 P-40 BAL.4 SH-1000 <br /> Matrix Spike <br /> % Recovery 95 102 99 96 97 92 91 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 101 101 97 101 102 98 93 <br /> Relative % <br /> Difference 6 1 0 99 2 0 5 1 5 0 6 3 22 <br /> Please Note <br /> The LCS Is a control sample of known Interterent free matrix that 1s analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The LCS%recovery data 1s used for <br /> validation of sample batch results Due to matrix effects,the OC limits for MS/MSDs are advisory only <br /> r <br /> and are not used to accept or(elect batch results <br /> Je le Higgins <br /> Project Manager <br /> 5010311 BRS <8> <br />