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' Sequoia 680 G c.peake Drive Redwood City CA 9406 (650)364-9600 FAX(650)364-92.33 <br /> q 404 N Wiget lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792 1865 FAX(707)79Z-0342 <br /> Pacific 5nvlronmental Croup Client Project Ili Unocal 0123, Tracy, CA <br /> 11315 Sunrise Gold Circle, Ste M Matrix Soil <br /> Rancho Cordova, CA 95742 <br /> Attention Mike Mitchener QC Sample Group S810079 Reported Oct 20, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1 <br /> 2,4-Dinitro- Penta- <br /> Acenaphthene 4-Nitrophenol toluene chlorophenol Pyrene <br /> Method. EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 <br /> Analyst: L Diaz L Diaz L Diaz L Diaz L Diaz <br />' Concentration <br /> Spiked 3,300 pg/kg 5 000 Ng/kg 3,300 pg/kg 5,000 Mg/kg 3 300 pg/kg <br />' LCS Batch#: BLK100898A BLK1001198A IILK100898A BLK100898A BLK100898A <br /> Date Prepared 10/08/98 10/08/98 10/08/98 10/08/98 10/08/98 <br /> Date Analyzed 10/12/98 10/12/98 10/12/98 10/12/98 10/12/98 <br /> Instrument I D#: GC/MS 1 GUMS 1 GC/MS 1 GUMS 1 GC/MS 1 <br /> LCS % <br /> Recovery 82 78 79 84 91 <br /> Control Limits: 31-137% 11-114% 28-89% 17-109% 35-142% <br /> MSIMSD <br /> Batch #- 8100177 8100177 8100177 8100177 8100177 <br /> ' Date Prepared: 10/02/98 10/08/98 10/08/98 10/08/98 10/08/98 <br /> Date Analyzed: 10/02/98 10/12/98 10/12/98 10/12/98 10/12/98 <br /> Instrument I D# GUMS 1 GUMS 1 GUMS 1 GUMS 1 GUMS 1 <br /> ' Matrix Spike <br /> % Recovery 76 75 76 90 82 <br /> ' Matrix Spike <br /> Duplicate % <br /> Recovery 85 78 82 96 88 <br /> Relative % <br /> Difference 11 26 77 64 71 <br /> SE 91.101A ANA ICAL Please Note <br /> 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 /> GC validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Finda C Schneider and are not used to accept or reject batch results <br /> ct Manager/Sacramento LaboraMry Page 2 o <br /> ' S810079 PES <9> <br />