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i <br />/'. Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> r'Y 1900 Rates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Str,ker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 'eocon Client Project 10 8$080-06-0 <br /> 11333 Sunco Dr, Suite 100 Matrix Soil <br /> Rancho Cordova, CA 95742 <br /> Attention John Juhrend QC Sample Goup 4110841-845 Reported Dec 1, 1994 <br /> V <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br /> ANALYTE Ethyl- <br />' Benzene Toluene Benzene Xylenes Diesel <br /> EPA <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 8015 Mod <br />' Analyst C Chapman C Chapman C Chapman C Chapman C Lee <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 15 mg/kg <br />' LCS Batch#: LCS112494 LCS112494 LCS112494 LCS112494 LCS112294 <br /> Date Prepared: 11/24/94 11/24/94 11/24/94 11/24/94 11/22/94 <br />' Date Analyzed 11/24/94 11/24/94 11/24/94 11/24/94 11/23/94 <br /> instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-313 <br /> LCS <br /> Recovery 100 92 101 100 93 <br /> Control Limits 75-125 75-125 75-125 75-125 60-130 <br /> MS/MSD <br /> Batch # 4110831 4110831 4110831 4110831 4110845 <br /> Date Prepared 11/24/94 11/24/94 11/24/94 11/24/94 11/22/94 <br /> Date Analyzed 11/24/94 11/24/94 11/24/94 11/24/94 11/23/94 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-3B <br /> Matrix Spike <br />' % Recovery 100 90 100 100 100 <br /> Matrix Spike <br />' Duplicate% <br /> Recovery. 100 95 100 98 92 <br /> Relative% <br />' Difference 00 54 00 20 8 3 <br /> KSEQUOIA ANALYTICAL 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 /> validation of sample batch resultsDue to matrix effects,the OC limits for MS/MSD's are advisory only <br /> ie Higgins and are not used tc accept or reject batch results <br /> ect Manager <br /> 4110841 GEC ¢4 a <br /> 10971 <br />