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i <br /> Sequoia 680 Cnesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N W,get Lane Walnut Creek CA 94598 (510) 989 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suue 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> ' Weinfelder Client Project ID 20-1129-30 <br /> 2825 East Myrtle St Matrix Water <br /> Stockton, CA 95205 <br /> Attention Roman Racca QC Sample Group 705-0607 Reported Jun 3, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,4-Dlchloro- N-Nitroso-Dl- 1,2,4-Tnchloro- 4-Chloro-3. <br /> Phenol 2-Chlorophenol benzene N-propytamine benzene Methylphenyl <br /> Method. EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 <br /> Analyst I Dalvand I Dalvand I Dalvand I Dalvand I Dalvand I Dalvand <br /> Concentration <br /> Spiked 200pg/L 200 ug/L 100ug/L 100ug/L 100ug/L 200 jug/L <br /> ' LCS Batch# LCS052397 LCS052397 LC8052397 LCS052397 LCS052397 LCS052397 <br /> Date Prepared 05/23/97 05/23/97 05/23/97 05/23/97 05/23/97 05/23/97 <br /> Date Analyzed 05/26/97 05/26/97 05/26/97 05/26/97 05/26/97 05/26/97 <br /> Instrument I D #. GC/MS-1 GC/MS-1 GC/MS-1 GC/MS-1 GC/MS-1 GC/MS-1 <br /> LCS % <br /> Recovery 105 90 82 100 88 85 <br /> Control Limits 12-110 27-123 36-97 41-116 39-98 23-97 <br /> n <br /> MS/MSD <br /> Batch# BS052397 BS052397 BS052397 BS052397 BS052397 BS052397 <br /> Date Prepared 05/23/97 05/23/97 05/23/97 05/23/97 05/23/97 05/23/97 <br /> Date Analyzed 05/26/97 05/26/97 05/26/97 05/26/97 05/26/97 05/26/97 <br /> Instrument I D#* GC/MS-1 GC/MS-1 GC/MS-1 GC/MS-1 GC/MS-1 GC/MS-1 <br /> Matrix Spike <br /> % Recovery, 105 110 98 98 99 90 <br /> Matrix Spike <br /> ' Duplicate% <br /> Recovery 105 110 100 92 100 95 <br /> Relative% <br /> ' Difference 00 00 20 63 20 54 <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,Interferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> M 4�1.1rip�n(t7 validation of sample batch results Due to matrix effects,the QC limits for MS/MSDs are advisory only <br /> Edana M Fruclano <br /> and are not used to accept or reject batch results <br />� <br /> Project Manager/Sacramento Laboratory Page 1 of 2 <br /> ' 7050607 KLF <8> <br />