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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> �rilrw <br /> Oettler-Ryan Client Project ID UNOCAL#5421-Stockton <br /> 6747 Sierra Court, Suite J Matrix Sold <br /> Dublin, CA 94568 j <br /> Attention Clyde Galantine QC Sample Group 8041420 Reported May 6, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Cadmium Chromium Lead Nickel Zinc <br /> QC Batch# ME042798 ME042798 ME042798 ME042798 ME042798 <br /> 601OMDA 601OMDA 601OMDA 601OMDA 601OMDA <br /> Analy Method EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 6010 <br /> Prep Method EPA 3050 EPA 3050 EPA 3050 EPA 3050 EPA 3050 <br /> Analyst J Kelly J Kelly J Kelly J Kelly J Kelly <br /> MS/MSD # 8041420 8041420 8041420 8041420 8041420 <br /> Sample Conc N D 33 mg/kg 6 2 mg/kg 26 mg/kg 48 mg/kg <br /> Prepared Date 4/27/98 4/27/98 4/27/98 4/27/98 4/27/98 <br /> Analyzed Date 4/30/98 4/30/98 4/30/98 4/30/98 4/30/98 <br /> Instrument I D # MV-3 MV 3 MV-3 MV-3 MV-3 <br /> Conc Spiked 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg <br /> Result N 17 88 58 80 100 <br /> MS % Recovery 00 110 104 108 104 <br /> Dup Result 52 87 55 81 100 <br /> MSD % Recov 104 108 98 110 104 <br /> RPD 200 11 53 12 00 <br /> RPD Limit 0-20 0-20 0-20 020 0-20 <br /> LCS # LCSO42798A LCSO42798A LCSO42798A LCSO42798A LCSO42798A <br /> Prepared Date 4/27/98 4/27/98 4/27/98 4/27/98 4/27/98 <br /> Analyzed Date 4/30/98 4/30/98 4/30/98 4/30/98 4/30/98 <br /> Instrument I D # MV 3 MV-3 MV-3 MV-3 MV-3 <br /> Conc Spiked 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg <br /> LCS Result 56 57 57 57 55 <br /> LCS % Recov 112 114 114 114 110 <br /> LCS 80-120 80120 80-120 80120 60-120 <br /> Control Limits <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, #1271 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sawPle <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> ' rirector <br /> interference,the LCS recove is to be used to validate the batch <br /> an e **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference <br /> La ra ory <br /> 8041418 GET <14> <br />