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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510)686-9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento C4 95834 (916) 921 9600 FAX(916)921 0100 <br />%kgro West, Inc Client Project ID Shell, 4315 Waterloo Road, Stockton, CA <br /> 1050 Melody Lane, Ste 160 Matrix Soil <br /> Roseville, CA 95678 <br /> Attention David L Poulsen OC Sample Group 4120206-209 Reported Dec 9, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Cadmium Chromium Lead Nickel Zinc Mercu <br /> Method EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 7471 <br /> Analyst. K Barta K Barta K Barta K Barta K Barta D Ballard <br /> Concentration <br /> Spiked 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 0 25 mg/kg <br /> LCS Batch# LCS120894 LCS120894 LCS120894 LCS120894 LCS120894 LCS120994 <br /> Date Prepared 12/8/94 12/8/94 12/8/94 12/8/94 12/8/94 12/9/94 <br /> Date Analyzed 12/8/94 12/8/94 12/8/94 12/8/94 12/8/94 12/9/94 <br /> Instrument I D # P-40 P-40 P 40 P-40 P 40 SH-1000 <br /> LCS <br /> Recovery 97 103 94 96 93 95 <br /> Control Limits 80-120 80-120 80-120 80-120 80-120 80-120 <br /> MS/MSD <br />' Batch # 4120128 4120128 4120128 4120128 4120128 4120187 <br /> Date Prepared 12/8/94 12/8/94 12/8/94 12/8/94 12/8/94 12/9/94 <br /> Date Analyzed' 12/8/94 12/8/94 12/8/94 12/8/94 12/8/94 12/9/94 <br />' Instrument I D #' P 40 P 40 P 40 P 40 P-40 SH-1000 <br /> Matrix Spike <br /> % Recovery' 98 104 95 111 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 97 96 * 89 114 96 <br /> Relative % <br /> Difference: 10 80 65 26 1 0 <br /> Please Nate <br /> The LCS is a control sample of known,interferent free matrix 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 /> i <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSDs are advisory only <br /> il/L <br /> 1r�` y� � and are not used to accent or re ect batch results *Matrix interference <br /> inda Ccc GSchneider <br /> Project Manager <br /> I4120206 FUG <10> <br />