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' Sequoia 680 C7esapzake Drive Redwood City CA 94063 (415) 364 9600 FAX(415)364 9233 <br /> 404 N W,get Lane Walnut Geek CA 94598 (St0) 988 9600 FAX(510)988 9673 <br /> AwAnalytical 819 Sinker Avenue Sii,le 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> %oKleinfelder Client project ID 20-1129-30 <br /> 2825 East Myrtle St Matrix Water <br /> Stockton, CA 95205 <br /> Attention Roman Racca QC Sample Group 7050605-06 Reported Jun 3, 1997 <br /> i <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE: t,t-DEchloro- Chloro- <br /> ethene Trichloroethene Benzene Toluene benzene <br /> Method EPA 8240 EPA 8240 EPA 8240 EPA 8240 EPA 8240 <br /> i Analyst: K Pocan K Pocan K Pocan K Pocan K Pocan <br /> Concentration <br /> Spiked: 50 mg/L 50 mg/L 50 mg/L 5o mg/L 50 mg/L <br /> 1 LCS Batch#. LGS060297 LCS060297 LCS060297 LCS060297 LCS060297 <br /> Date Prepared 06/02/97 06/02/97 06/02/97 06/02/97 06/02/97 <br /> ' Date Analyzed- 06/02/97 06/02/97 06/02/97 06/02/97 06/02/97 <br /> Instrument I D.# MS-F1 MS-F1 MS-F1 MS-F1 MS-F1 <br /> LCS % <br /> Recovery: 97 109 109 107 108 <br /> Control Limits 65-135 70.130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch#- 7050605 7050605 7050605 7050605 7050605 <br /> Date Prepared. 06/02/97 06/02/97 06/02/97 06/02/97 06/02/97 <br /> Date Analyzed 06/02/97 06/02/97 06/02/97 06/02/97 06/02/97 <br /> Instrument I.D.#- MS-F1 MS-F1 MS-F1 M9-F1 MS-F1 <br /> Matrix Spike <br /> ' %Recovery: 104 102 107 107 104 <br /> Matrix Spike <br /> Duplicate% <br /> ' Recovery. 105 103 105 106 103 <br /> Relative% <br /> ' Difference 10 10 20 10 1 0 <br /> Please Note <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 QC limits for MS/MSD's are advisory only <br /> ZU <br /> M F C4A� JO and are not used to accept or re ect batch results <br /> i Edana M Fruclano <br /> Project Manager/Sacramento Laboratory <br /> ' 7050605 KLF <9> <br />