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' 11018 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> Se <br /> -'Y J q 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> l� Analytical 819 Striker Avenue,Suite 8 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 /> i <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,4-Dichloro- N-Nitroso-Di- 1,2,4-Trlchloro- 4-Chloro-3- <br /> Phenol 2-Chlorophenol benzene N-propylarnine benzene Methylphanyl <br /> Method EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 <br />' Analyst B Pltamah B Pltamah B Pltamah B Pdamah B Pitamah B Pitarnah <br /> Concentration <br /> Spiked 3,300 Ng/kg 3,300 Ng/kg 3,300 Ng/kg 3,300 pg/kg 3,300 pg/kg 3,300 pg/kg <br /> LCS Batch# SBO3048S SB0304BS SBO304BS SBO304BS SB0304BS SB0304BS <br /> Date Prepared 03/04/98 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 03/04/98 <br /> Instrument I D # F4 F4 F4 F4 F4 F4 <br /> LCS % <br /> Recovery 68 72 64 69 72 66 <br /> Control Limits 2690% 25102% 28-104% 41-126% 38-107% 26-103% <br /> MS/MSD <br /> ' Batch# 9802150-01 9802150-01 9802150-01 9802150 Oi 9802150-01 9802150-01 <br /> Date Prepared 03/02/98 03/02/98 03/02/98 03/02/98 03/02/98 03/02/98 <br /> Date Analyzed 03/03/98 03/03/98 03/03/98 03/03/98 03/03/98 03/03/98 <br /> instrument I D # F4 F4 F4 F4 F4 F4 <br /> Matrix Spike <br /> ' % Recovery 66 66 44 68 62 65 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 71 71 52 72 69 72 <br /> Relative% <br /> ' Difference 62 62 18 61 11 98 <br /> Please Note <br /> SEQUOIA ANALYTIC L 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 /> i '�/C�9 validation of sample batch results Due to matrix effects,the QC limits for MS/MSD s are advisory only <br /> in/ U and are not used to accept or reject batch results <br /> da C Schneider <br /> rolect Manager/Sacramento Laboratory Page 1 of 2 <br /> 8030061 PES <15> <br />