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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 <br /> (510) 686 9600 FAX(5E0) 686 9689 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Del-Tech Client Project ID George's Service <br /> 10624 Olive Ave Matrix Sod <br /> Oakdale, CA 95361 <br /> Attention Don Light OC Sample Group 5041447-1468 Reported May 4, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE: <br /> Lead Lead <br /> Method EPA 6010 EPA 6010 <br /> Analyst K Bartz K Barta <br /> Concentration <br /> Spiked 50 mg/kg 50 mg/kg <br /> LCS Batch# LCS050195 LCS050195 <br /> Date Prepared 5/1/95 5/1/95 <br /> Date Analyzed 5/3/95 5/3/95 <br /> Instrument I D.# P-40 P-40 <br /> LCS <br /> Recovery toy 98 <br /> Control _1mits: 80-120 80-120 <br /> MS/MSD <br /> Batch # 5041148 5050042 <br /> Date Prepared 5/1/95 5/1/95 <br /> Date Analyzed 5/1/95 5/1/95 <br /> Instrument I D # P-40 P-40 <br /> Matrix Spire <br /> % Recovery 94 93 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 91 96 <br /> Relative % <br /> Difference 3 2 32 <br /> Please Mote <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 /> validation of sample batch results Due to matrix effects,the OC limits for MS/MSD's are advisory only <br /> and are not used to accept or reject batch results <br /> Linda C Schneider <br /> Project Manager <br /> 5041447 RDD [3> <br />