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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415)364 9233 <br /> 404 N Wigct Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Strskcr Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 6einfelder Client Project ID 20-1129-30 G01 <br /> 2825 East Myrtle St Matrix Water <br /> Stockton, CA 95205 <br /> Attention Roman Racca QC Sample Group 7060644-0645 Reported Jun 23, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,4-Dlchloro- N Nitroso-Di- 1,2,4-Trichloro- 4-Chloro-3- <br /> Phenol 2-Chlorophenol benzene N-propylamine benzene Methylphenyl <br /> Method EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 <br /> Analyst' B Pitamah B Pitamah B Pitamah B Pitamah B Pltamah B Pitamah <br /> 1 Concentration <br /> Spiked 200 pg/L 200 pg/L 200 pg/L 200 pg/L 200 pg/L 200 pg/L <br /> LCS Batch# LCS061997 LCS061997 LCS061997 LCS061997 LCS061997 LCS061997 <br /> Date Prepared 06/19/97 06/19/97 06/19/97 06/19/97 06/19/97 06/19/97 <br /> Date Analyzed 06/23/97 06/23/97 06/23/97 06/23/97 06/23/97 06/23/97 <br /> Instrument I D # H5 H5 H5 H5 H5 H5 <br /> LCS % <br /> Recovery 41 75 64 67 83 63 <br /> Control Limits 12-110 27-123 36-97 41-116 39.98 23-97 <br /> ' MS/MSD <br /> Batch# 9706905 29 9706905.29 9706905-29 9706905-29 9706905-29 9706905-29 <br /> Date Prepared 06/19/97 06/19/97 06/19/97 06/19/97 06/19/97 06/19/97 <br /> Date Analyzed 06/23/97 06/23/97 06/23/97 06/23/97 06/23/97 06/23/97 <br /> ' Instrument I D # H5 H5 H5 H5 H5 H5 <br /> Matrix Spike <br /> % Recovery. 42 71 69 90 75 73 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 45 74 69 92 78 76 <br /> Relative% <br /> Difference 69 35 070 22 39 47 <br /> 1 <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 ;Rvp--o validation of sample batch results Due to matrix effects,the QC limits for MS/MSDs are advisory only <br /> and are not used to accept or reject batch results <br /> Edana M Fruclano <br /> Project Manager/Sacramento Laboratory Page 1 of 2 <br /> 7060644 KLF <8> <br />