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Sequoia 680 Chesapeake Dnv: Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N WLget Lane Walnuc Creek CA 94598 (510) 988 %00 FAX(M)998 9673 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 0 Brown&Caldwell Client Project ID Arco 5450, Stockton <br /> 9616 Micron Ave, Suite 600 Matrix Soil <br /> Sacramento, CA 95827 <br /> Attention Steve Misner QC Sample Group 510-0989 Reported Oct 30, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE STLC <br /> Lead <br /> Method. EPA 6010 <br /> Analyst so <br /> Concentration <br /> Spiked. 10 mg/L <br /> LCS Batch# LCS103095 <br /> Date Prepared. 10/30/95 <br /> Date Analyzed 10/30/95 <br /> Instrument I D # MTJA-2 <br /> LCS % <br /> • Recovery 99 <br /> Control Limits 75-125 <br /> n , v h �nµ h.v , . , A., � , ..v< • � yr ; x .,. .. .. ,v r„4. ,,. � h ,n`{ <br /> MS/MSD <br /> Batch# 951OK03-1 <br /> Date Prepared 10/30/95 <br /> Date Analyzed 10/30/95 <br /> Instrument I.D.#. MTJA 2 <br /> Matrix Spike <br /> %Recovery 97 <br /> Matrix Splice <br /> Duplicate% <br /> Recovery, 98 <br /> Relative% <br /> Difference 10 <br /> Please Note <br /> The LCS Is a control sample of known,interferent free matnx that 1s analyzed using the same reagents, <br /> _ SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> *Z <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSDs are advisory only <br /> and are not used to accept or fe ect batch results <br /> Janet rian <br /> Profec anager <br /> 5100989 SRS <2> <br /> I <br />