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` SEQUOIA ANALYTICAL 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 (916) 921-9600 • FAX (916) 921-0100 ..- , r u.. ,N .. ,.. .o r r....,,., ,. ..w.u.»; ,,. .c:.,..:r`;.`.`',J: r.•%v° ;..,»,':s.,... , -ugr`o West,Inc r{ `V� " " GIent Pra�ect 1 ` Shell,'i41'hi 1 I aarado, Stockton;�A 50 Melody Lane, Ste 160 Matra Water Roseville, CA 95678 Attention Paul Graff QC Sample Group 404-0118 Reported Apr 18, 1994 QUALITY CONTROL DATA REPORT ANALYTE Cadmrum Chromium Copper Nickel Silver Zinc Lead Method EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 9 Analyst S Foster S Foster S Foster S Foster S Foster S Foster S Foster Concentration Spiked. 1 0 mg/L 1 0 mg/L 1 0 mg/L 1 0 mg/L 10 mg/L 1 0 mg/L 1 0 mg/L LCS Batch#- LCSO41294 LCSO41294 LCSO41294 LCSO41294 LCSO41294 LCSO41294 LCSO41294 Date Prepared: 4/12/94 4/12/94 4/12/94 4/12/94 4/12/94 4/12/94 4/12/94 Date Analyzed: 4/12/94 4/12/94 4/12/94 4/12/94 4/12/94 4/12/94 4/13/94 Instrument I.D.# PE-40 PE-40 PE-40 PE-40 PE-40 PE-40 PE-40 LCS % Recovery 94 94 93 92 94 96 83 •Control Limits 80-120 80-120 80-120 80-120 80-120 80-120 80.120 MS/MSD Batch # 4030133 4030133 4030133 4030133 4030133 4030133 4030133 Date Prepared 4/12 94 4/12/94 4/12/94 4/12/94 4/12/94 4/12/94 4/12/94 Date Analyzed- 4/12 94 4/12/94 4/12/94 4/12/94 4/12/94 4/12/94 4/13/94 Instrument I.D.# PE4O PE-40 PE40 PE40 PE-40 PE40 PE-40 Matrix Spike %Recovery 88 91 89 90 87 88 92 Matrix Spike Duplicate % Recovery 93 96 96 96 94 94 91 Relative% Difference 55 54 67 67 78 67 11 Please Note The LCS is a control sample of known interferent tree matrix that is analyzed using the same reagents, SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The LCS%recovery aata is used for validation of sample batch results Due to matnx effects the CC limits for MS/MSDs are advisory only and are not used to accent or resect batch results Linda C Schneider Project Manager 4040118 FUG <7>