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Sequoia680 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 /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> leinfelder 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 /> 1 <br /> ANALYTE 2,4-Dinitra- Penta- <br /> , Acena hthene 4-Nitrophenol toluene chlorophenol Pyrene <br /> Method EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 <br /> Analyst B Pitamah B Pitamah B Pitamah B Pitamah B Pitamah <br /> Concentration <br /> Spiked 20oug/L 200 ug/L 200 ug/L 200 ug/L 200 ug/L <br /> LCS Batch# LCS061997 LCS061997 LCS061997 LCS061997 LCS061997 <br /> ' Date Prepared 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 <br /> ' Instrument I D # H5 H5 H5 H5 H5 <br /> LCS % <br /> Recovery 67 15 66 70 78 <br /> Control Limits 46-118 10-80 24-96 9-103 26-127 <br /> MS MSD <br /> Batch# 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 <br /> Date Analyzed 06/23/97 06/23/97 06/23/97 06/23/97 06/23/97 <br /> ' Instrument I D # H5 H5 H5 H5 H5 <br /> Matrix Spike <br /> % Recovery 68 35 79 83 78 <br /> Matrix Spike <br /> Duplicate% <br /> ' Recovery. 69 36 77 90 77 <br /> Relative% <br /> Difference 070 29 26 81 13 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> A M FRyoiMp preparation and analytical methods employed for the samples The LCS%recovery data 1s used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Edana M Fruciano and are not used to accept or refect batch results <br /> Project Manager/Sacramento Laboratory Page 2 of 2 <br /> 7060644 KLF <9> <br />