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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(5 10) 988 9673 <br /> Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Pacific Environmental Group Client Project ID 920-119 1A/Chevron 9-6171, Stockton CA <br /> 11315 Sunrise Gold Circle Ste M Matrix Soil <br /> Rancho Cordova, CA 95742 <br /> Attention Tim Anenson OC Sample Group 8010310-0314 Reported Jan 26 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Cadmium Chromium Lead Nickel Zinc Oil &Grease <br /> Method EPA 6010A EPA 6010A EPA 6010A EPA 6010A EPA 6010A SM 5520 CP <br /> Analyst D Knab D Knab ❑ Knab D Knab D Knab L Martin <br /> Concentration <br /> Spiked 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 100 mg/kg <br /> LCS Batch# LCS011398 LCS011398 LCS011398 LCS011398 LCS011398 LCSol 1998 <br /> Date Prepared 01/13/98 01/13/98 01/13/98 01/13/98 01/13/98 01/19/98 <br /> Date Analyzed 01/15/98 01/15/98 01/15/98 01/15/98 01/15/98 01/19/98 <br /> Instrument I D # ICP-1 ICP-1 ICP-1 ICP-1 ICP-1 IR-1 <br /> LCS % <br /> Recovery 94 96 95 97 96 96 <br /> Control Limits 80 120 80 120 80 120 60 120 80 120 80 120 <br /> MS/MSD <br /> Batch # 8010355 8010355 8010355 8010355 8010355 8010367 <br /> Date Prepared 01/13/98 01/13/98 01/13/98 01/13/98 01/13/98 01/19/98 <br /> Date Analyzed 01/15/98 01/15/98 01/15/96 01/15/98 01/15/98 01/19/98 <br /> Instrument I D # ICP-1 ICP-1 ICP-1 lCP-1 ICP-1 IR-1 <br /> Matrix Spike <br /> % Recovery 80 96 58 72 73 40 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 75 75 58 72 71 52 <br /> Relative % <br /> Difference 6 4 24 0 0 0 0 2 8 26 <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%recovery data is used for <br /> j validation of sample batch results Due to matrix effects the OC limits for MS/MSD s are advisory only <br /> ,717�� and are not used to accept or reject batch results <br /> inda/C Scchhelder <br /> Project Manager/Sacramento Laboratory <br /> 8010310 PES <30> <br />