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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> ' 404 N Wiget Lane Wainuc Creek CA 94598 (5 10) 988 9600 FAX(510) 988 9673 <br /> Analytical 919 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Qelta Environmental Consultants Client Project ID Unocal #5886 <br /> w164 Gold Camp Dr , Suite 200 Matrix Soil <br /> Rancho Cordova, CA 95670 <br /> Attention Eric Holm CC Sampie Group 507-1403 Reported Aug 10, 1995 <br /> (QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Cadmium Chromium Lead Nickel Zinc <br /> ' Method E°A 6010 EPA 6010 EPA 6010 EPA 6010 EPA 6010 <br /> Analyst. K Barta K Barta K Barta K Barta K Barta <br /> Concentration <br /> Spiked 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg <br /> LCS Batch# LCS073195 LCS073195 LCS073195 LCS073195 LCS073195 <br /> ' Date Prepared' 7/31/95 7/31/95 7/31/95 7/31/95 7/31/95 <br /> Date Analyzed 8/11/95 8/11/95 8/11/95 8/11/95 8/11/95 <br /> Instrument I D # MTJA-2 MTJA 2 MTJA-2 MTJA 2 MTJA 2 <br /> ' LCS % <br /> Recovery 100 95 100 95 99 <br /> Control Limits 80-120 80-120 80-120 80-120 80-120 <br /> I ' MS/MSD <br /> Batch # 5071403 50714033 5071403 5071403 5071403 <br /> ' Date Prepared 7/31/95 7/31/95 7/31/95 7/31/95 7/31/95 <br /> Date Analyzed. 8/11/95 8/11/95 8/11/95 8/11/95 8/11/95 <br /> Instrument I D # MTJA-2 MTJA-2 MTJA-2 MTJA 2 MTJA 2 <br /> ' Matrix Spike <br /> % Recovery 92 96 91 88 90 <br /> ' Matrix Spike <br /> Duplicate % <br /> Recovery 88 94 89 84 86 <br /> ' Relative % <br /> Diff erence 44 21 22 46 45 <br /> ' Please Note <br /> The LCS 1s a control sample or known interterent free matrix that is anaiyzed using he same reagents <br /> SEQUOIA ANALYTICAL precaration ana anaiyticai methods employed for the samoies The LCS% recovery data is used tor <br /> t V - /' , vahcatian of sample batcn resusts Due to matrix erfec-s he QC limas.or MS USas are advisoryeniy <br /> i <br /> ano are not used to acceet or resect batcn results <br /> Linda C Schneider <br /> Project Manager <br /> 5071403 DLT <10> <br />