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UOla Se •0 Chesapeake Drive Redwood City,CA 94063.650) 364.9600 FAX(650)364-9233 <br /> Sequoia 404 N.Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(5 10)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> Kleinfelcier Client Project ID: 20-4054-01.E01 <br /> 2825 East Myrtle St. Matrix: Soil/Water <br /> Stockton, CA 95205 <br /> Attention: Tony Martin QC Sample Group 8030426-0428, 0430 Reported Mar 26 1998 <br /> P p <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE: 1,1-Dichloro- Chloro- <br /> ethene Trichloroethene Benzene Toluene benzene <br /> Method: EPA 8260 EPA 8260 EPA 8260 EPA 8260 EPA 8260 <br /> ' Analyst: K. Pocan K.Pocan K.Pocan K. Pocan K.Pocan <br /> Concentration <br /> Spiked: 50pg/L 50pg/L 50Ng/L 50pg/L 50pg/L <br /> LCS Batch#: LCS031998 LCS031998 LCS031998 LCS031998 LCS031998 <br /> Date Prepared: 03/19/98 03/19/98 03/19/98 03/19/98 03/19/98 <br /> ( Date Analyzed: 03/19/98 03/19/98 03/19/98 03/19/98 03/19/98 <br /> Instrument I.D.#: MS-F1 MS-F1 MS-F1 MS-F1 MS-F1 <br /> LCS 9/6 <br /> Recovery: 122 112 108 105 111 <br /> Control Limits: 65-135% 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD <br /> Batch#: 8030229 8030229 8030229 8030229 8030229 <br /> Date Prepared: 03/19/98 03/19/98 03/19/98 03/19/98 03/19/98 <br /> iDate Analyzed: 03/19/98 03/19/98 03/19/98 03/19/98 03/19/98 <br /> Instrument I.D.#: MS-F1 MS-F1 MS-F1 MS-F1 MS-F1 <br /> Matrix Spike <br /> % Recovery: 129 129 123 120 115 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 115 116 112 109 106 <br /> Relative% <br /> Difference: 11 11 9.4 9.6 8.1 <br /> Please Note: <br /> IThe LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQU IA 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 /> and are not used to acce t or re'ect batch results. <br /> inda C. Schneider <br /> Project Manager/Sacramento Laboratory <br /> 8030426.KLF <24> <br />