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Sequoia 680 Chesapeake Drive 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 /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)931 0100 <br /> Analytical <br /> 41el-Tech Client Project ID (quarterly G W Monitoring / Stan Morn Ford <br /> 10624 Olive Ave Matrix Water <br /> Oakdale, CA 95361 <br /> Attention Don Light QC Sample Group 6071058-64 Reported Aug 8, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloro- Trichloro- Chloro- 1,1-Dichloro- Tnohioro- Chloro- <br /> ethane ethene benzene ethane ethene benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 EPA 8010 EPA 8010 EPA 8010 <br /> Analyst K Pocan K Pocan K Pocan K Pocan K Pocan K Pocan <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug1L 10 uglL 10 ug/L 10 ug1L <br /> LCS Batch# LCS080596 LCS080596 LCS080696 LCS080696 LCS080696 LCS080696 <br /> Date Prepared 08/05/96 08/05/96 08/05/96 08/06/96 08/06/96 08/06/96 <br /> Date Analyzed 08/05/96 08/05/96 08/05196 08/06/96 08/06/96 08/06/96 <br /> Instrument I D # GC6 GC6 ccs GC6 GC6 GC6 <br /> LCS % <br /> 10 Recovery 70 72 88 69 72 88 <br /> Control Limits 70-130 70-130 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch # 6071058 6071058 6071058 6071063 6071063 6071063 <br /> Date Prepared 08/05/96 08/05/96 08/05/96 08/06/96 08/06/96 08/06/96 <br /> Date Analyzed 08/05/96 08/05/96 08/05/96 08/06/96 08/06/96 08/06/96 <br /> Instrument I D # GC6 ccs GC6 GC6 GC6 GC6 <br /> Matrix Spike <br /> % Recovery 92 97 106 81 78 101 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 68 62 84 93 81 106 <br /> Relative % <br /> Difference 30 44 23 15 35 48 <br /> Please Note <br /> The LCS 1s 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 QC limits for MS/MSDs are advisory only <br /> 616Aaeull <br /> and are not used to accept or reject batch results <br /> inda C Schneider <br /> Project Manager/Sacramento Laboratory <br /> 6071059 Dao <s> <br />