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r ■ ' Sequoia 680 Chesapeake Cave Redwood City, CA 94063 (415) 364-9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 319 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> *el-TeCh Client Project ID Sherwood Labs /George's Service <br /> 10624 Olive Ave Matrix Water <br /> Oakdale, CA 95361 <br /> Attention Don Light OC Sample Group 7091222-33 Reported Oct 3, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> APIA <br /> LYTE <br /> MTBE MTBE <br /> Method- EPA 8260 EPA 8260 <br /> Analyst M Williams M Williams <br /> Concentration <br /> Spiked 50 ug/L 50 Ng/L <br /> LCS Batch# LCS092997 LCS093097 <br /> Date Prepared 09/29/97 09/30/97 <br /> Date Analyzed 09/29/97 09/30/97 <br /> Instrument LD # F3 F3 <br /> LCS % <br /> Recovery 110 112 <br /> Control Limits, 70-130 70-130 <br /> MS/MSD <br /> Batch #- 9709698-01 9709898-01 <br /> Date Prepared. 09/29/97 09/29/97 <br /> Date Analyzed 09/29/97 09/29/97 <br /> Instrument I D # F3 F3 <br /> Matrix Spike <br /> % Recovery: 118 118 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 116 116 <br /> Relative % <br /> Difference- 17 17 <br /> Please!Vote <br /> IThe LCS 1s a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SYnNC <br /> IA ANALYTIC L preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> a6�y&�o <br /> validation of sample batch results Due to matnx effects the OC limits for MS/MSDs are advasory only <br /> and are not used to acce t or re ect batch results <br /> Schneider <br /> rolect Manager/Sacramento Laboratory <br /> 709122-2 DTC 413> <br />