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1 <br /> SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> RESNA Client Project ID F7132 32, Quik Stop 132 <br /> 1 p <br /> 3315 Almaden Expwy,, Suite 34 Matrix Water <br />' San Jose, CA 95118 <br /> Attention Rich Garlow QC Sample Group 31-17W1-2 Reported Aug 25, 1993 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes _ r <br />' Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst' R Geckler R Geckler R Geckler R Geckler <br /> Conc. Spiked, 10 10 10 30 <br /> Units pg/L ug/L pg/L pe/L <br /> LCS Batch#. BLK082393 BLKD82393 BLK082393 BLK082393 <br /> Date Prepared' 8/23/93 8/23/93 8/23/93 8/23/93 <br /> Date Analyzed* 8/23/93 8/23/93 8/23/93 8/23/93 <br /> Instrument LD # GCHP-18 GCHP-18 GCHP-18 GCHP 18 <br /> LCS % <br /> Recovery: loo 100 100 100 <br />' Control Limits: 80-120 80-120 80-120 80-120 <br />' MS/MSD <br /> Batch# 31-172001 3H72001 31-172001 3H72001 <br />' Date Prepared' 8/23/93 8/23/93 8/23/93 8/23/93 <br /> Date Analyzed. 8/23/93 8/23/93 8/23/93 8/23/93 <br />' Instrument LD #' GCHP-1a GCHP-18 GCHP-18 GCHP-18 <br /> Matrix Spike <br /> %Recovery 97 97 96 97 <br /> tMatrix Spike <br /> Duplicate% <br /> Recovery: 100 100 100 103 <br /> rRelative% <br /> Difference. 30 3 0 41 S 0 <br /> S_EOUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> 4 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 QC limits for MS/MSD's are advisory only <br /> 1 and are not used to accept or refect batch results <br /> Vickie Tague 3H79401 RES <2> <br />' Project Manager <br />