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' Sequoia <br /> 680 Chesapeake Drive Redwood City CA 94063 t650) 364 9600 FAX(650)364 9233 <br /> -"►�� �} 1 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)998 9673 <br /> Analytical 819 Striker Avenue,Suite 9 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Pacific Environmental Group Client Project Ib 920 122 1A/Chevron 9-9840 <br /> 11315 Sunrise Gold Circle, Ste M Matrix Sod <br /> Rancho Cordova, CA 95742 <br /> Attention Tim Anenson QC Sample Group 8030061-0070, 0074 Reported Mar 5, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br /> ANALYTE 2,4-Dinitro- Penta- <br /> Acenaphthene <br /> enta- <br /> Acena hthene 4 Nitrophenol toluene chloro heno Pyrene <br /> Method' EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 <br /> Analyst 8 Pitamah B Pitamah B Pitamah B Pitamah B Pitamah <br /> Concentration <br /> Spiked 3,300 pg/kg 3,300pg/kg 3,300 pg/kg 3,300pg/kg 3,300 ug/kg <br /> LCS Batch# SB0304SS SB0304BS SBO304BS SB0304BS SBO304BS <br /> Date Prepared 03/04/98 03/04/98 03/04/98 03/04/98 03/04/98 <br /> Date Analyzed 03/04/98 03/04/98 03/04/98 03/04/98 03/04/98 <br /> instrument I D # F4 F4 F4 F4 F4 <br /> LCS y <br /> Recovery 65 44 89 42 66 <br /> Control Limits 31-137 11-114 2889 17-109 35-142 <br /> ' <br /> MS/MSD <br /> Batch # 9802150-01 9802150-01 9802150-01 9802150-01 9802150-01 <br /> Date Prepared 03/02/98 03/04/98 03/04/98 03/04/98 03/04/98 <br /> Date Analyzed 03/03/98 03/04/98 03/04/98 03/04/98 03/04/98 <br /> Instrument I D # F4 F4 F4 F4 F4 <br /> Matrix Spike <br /> ' % Recovery 63 63 71 57 6fi <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 68 59 77 58 B1 <br /> Relative <br /> ' Difference 69 11 86 <br /> 1 1 20 <br /> SEQ OIA ANALYTIC L Please Note <br /> /7 The LCS is a control sample of known,tnterferent free matrix that 1s analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LOS 9b recovery data is used for <br /> L" validation of sample batch results Due to matrix effects,the QG limits for MS/MSD s are advisory only <br /> Inda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labors ory Page 2 of 2 <br /> 8030061 PES �16> <br />