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i <br /> Sequoia 680 Chesapeake Dnvc Redwood City,CA 94063 (41 S) 364-9600 FAX(415) 364-9233 <br /> 1900 Bates Avenue,Suite L Concord CA 94520 (510) 686-9600 FAX(510) 686%89 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(9t6)921 0100 <br /> Fugro W6st, Inc Tient Project ID Shell, 141 N 1 liorado, Stockton, CA` <br /> 1050 Melody Lane, Ste 160 Matrix Water/Air <br /> Roseville, CA 95678 <br /> Attention Sudhakar Talankt OC Sample Group 5040530-533 Reported Ajar 26, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Cadmium Nickel Silver Chromium Lead Zinc Copper <br /> Method. EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 <br /> Analyst: K Barta K Barta K Barta K Barta K Sarta K Barta K $arta <br /> Concentration <br /> Spiked: 0 50 mg/L 0 50 mg/L 0 50 mg/L 0 50 mg/L 0 50 mg/L 0 50 mg/L 0 50 mg/L <br /> LCS Batch#: LCSO41895 LCSO41895 LCSO41895 LCSO41895 LCSO41895 LCSO41895 LCSO41895 <br /> Date Prepared: 4/18/95 4/18/95 4/18/95 4/18/95 4/18/95 4/18/95 4/18/95 <br /> Date Analyzed: 4/21/95 4/21/95 4/21/95 4/20/95 4/20/95 4/20/95 4/21/95 <br /> Instrument I.D #, P 40 P 40 P 40 P 40 P 40 P 40 P 40 <br /> • LCS % <br /> Recovery- 92 103 92 101 88 93 98 <br /> Control Limits: 80-120 80-120 80-120 80-120 80-120 80-120 80-120 <br /> MS/MSD <br /> Batch #' 5040592 5040592 5040592 5040592 5040592 5040592 5040592 <br /> Date Prepared: 4/18/95 4/18/95 4/18/95 4/18/95 4/18/95 4/18/95 4/18/95 <br /> Date Analyzed: 4/21/95 4/21/95 4/21/95 4/20/95 4/20/95 4/20/95 4/21/95 <br /> Instrument I.D #: P 40 P 40 P 40 P 40 P 40 P 40 P 40 <br /> Mahe Spike <br /> % Recovery- 97 95 94 107 89 100 98 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 99 97 93 106 89 94 97 <br /> Relative% <br /> Difference: 20 21 11 094 0 0 6 2 10 <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> +�EGIUOIA ANALYTICAL 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 QC limits for MS/MSD,3 are advisory only <br /> and are not used to accept or reject batch results <br /> Linda C 'chnefder�� <br /> Project Manager 5040530 PUG <9> <br />