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Sequoia680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> IT� <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 (9 16) 921 0100 <br /> IIS <br /> 40OUChstone Development Client Project ID Chevron #9-2033 <br /> P O Box 2554 Matrix Solid <br /> Santa Rosa, CA 95405 <br /> Attention ,teff Monroe OC Sample Group 7030207 Reported Mar 13, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Cadmium Chromium Nickel Lead Zinc <br /> QC Batch# ME030697 ME030697 ME030697 ME03D697 ME030697 <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 # 7030249 7030249 7030249 7030249 7030249 <br /> Sample Conc N D 100 mg/kg 170 mg/kg 67 mg/kg 160 mg/kg <br /> Prepared Date 3/6/97 3/6/97 3/6/97 3/6/97 3/6/97 <br /> Analyzed Date 3/10/97 3/10/97 3/10/97 3/10/97 3/10/97 <br /> Instrument I D # MV-4 MV-4 MV-4 MV-4 MV-4 <br /> Conc Spiked 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg <br /> Result 46 120 170 120 220 <br /> MS % Recovery 92 40 106 120 <br /> Dup Result 45 140 200 120 230 <br /> SD % Recov 90 80 60 106 140 <br /> RPD 22 15 16 00 44 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-20 <br /> LCS # LCS030697 LCS030697 LCS030697 LCS030697 LCS030697 <br /> Prepared Date 3/6/97 3/6/97 3/6/97 3/6/97 3/6/97 <br /> Analyzed Date 3/10/97 3/10/97 3/10/97 3/10/97 3/10/97 <br /> Instrument I D # MV 4 MV 4 MV-4 MV-4 MV 4 <br /> Conc Spiked 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg <br /> LCS Result 51 51 51 50 51 <br /> LCS % Recov tot 102 102 100 102 <br /> LCS 80120 80120 80120 80-120 80120 <br /> Control Limits <br /> Please Note <br /> The LCS 1s a control sample of known,interferent-tree 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 sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> he recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Melissa A Brewer **MS=Matrix Spike,MSD=IMS Duplicate, APD=Relative%Difference <br /> Client Services Representative <br /> 7030207 TO U <13> <br />