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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> Analytical 1900 Bates Avenue,Suite L Concord,CA 94520 (510) 686 9600 FAX (510)686 9689 <br /> 819 Strtker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> �eoSt30 <br /> rategies Inc Client Project ID Unocal 7827 03 ` <br /> 35 Prospect Park Dr, Suite 80 Matrix Soil <br /> Rancho Cordova, CA 95670 <br /> Attention Steve Carter QC Sample Group 407-0384 Reported Jul 26, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Cadmium Chromium Lead Nickel <br /> Method EPA 6010 EPA 6010 EPA 6010 EPA 6010 <br /> Analyst D Ballard D Ballard D Ballard D Ballard <br /> Concentration <br /> Spiked 2 0 mg/L 2 0 mg/L 2 0 mg/L 2 0 mg/L <br /> LCS Batch# M070594B M070594B M070594B M070594B <br /> Date Prepared 7/5/94 7/5/94 7/5/94 7/5/94 <br /> Date Analyzed 7/26/94 7/26/94 7/26/94 7/26/94 <br /> instrument I D # PE-40 PE-40 PE-40 PE-40 <br /> LCS % <br /> Recovery 102 105 103 103 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> v r � ♦ r v ` n s ' � ` x• M1} hr r r { } h nv� v rvti r <br /> MS/MSD <br /> Batch # 40703841S 40703841S 407038415 40703841S <br /> Date Prepared 7/26/94 7/26/94 7/26/94 7/26/94 <br /> Date Analyzed 7/26/94 7/26/94 7/26/94 7/26/94 <br /> Instrument I ❑ #. PE-40 f E-40 PE-40 PE-40 <br /> Matrix Spike <br /> % Recovery 88 88 69 93 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 87 87 91 92 <br /> Relative% <br /> Difference 1 1 1 1 2 2 1 1 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The LCS%recoverydata is used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSDs are advisory only <br /> 0 CA r1 t and are not used to accept or reject batch results <br /> Craig C LQ <br /> Project Manager <br /> 4070362 GSI <6> <br />