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I, <br /> 1 i <br /> 1.,--',..,..t:l)--S,equoia-_.__.,_68OjChesapeake Drive Redwood City CA 94063 (415) 364 9600 _FAX_(115) 364 9Z3 swi Yam.-ate T <br /> 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> " Analytical B19 Striker Avenue Suite 8 Sacramento CA 95834 (9 16) 921 9600 FAX(916)921 0100 i <br /> n I, i <br /> Geocon Client Project 11) 305 S Hutchins <br />' 11333 Sunco Dr, Suite 100 Matrix Sol] " <br /> Rancho Cordova, CA 95742 , 1 <br /> Attention John Juhrend QC Sample Goup 4111013-015 Reported Dec 6, 1994 , <br /> 1 , <br /> QUALITY CONTROL DATA REPORT <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 7 5 mg/kg „x <br />' LCS Batch# LCS120594 LCS120594 LCS120594 LCS120594 LCS112894 <br /> Date Prepared 12/5/94 12/5/94 12/5/94 12/5/94 11/28/94 <br /> Date Analyzed. 12/5/94 12/5/94 12/5/94 12/5/94 11/29/94 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 GCHP-3B <br /> LCS °,6 <br /> Recovery' 115 110 115 112 100 <br /> Control Limits 75-125 75-125 75-125 75-125 60-130 <br />' MS/MSD u <br /> Batch # 4120015 4120015 4120015 4120015 4111013 rt <br /> Date Prepared. 12/5/94 12/5/94 12/5/94 12/5/94 11/28/94 <br /> Date Analyzed 12/5/94 12/5/94 12/5/94 12/5/94 11/29/94 l <br /> Instrument LD # GCHP-1 GCHP-1 GCHP-1 GCHP-1 GCHP-38 <br /> Matrix Spike <br />' % Recovery 100 100 100 105 103 <br /> , <br /> Matrix Spike <br />' Duplicate% <br /> Recovery 100 100 i '105 105 112 <br /> I ' <br /> Relative% <br /> Difference 00 00 49 00 84 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS's a control sample of known,interferent free matrix that 1s analyzed using the same reagents, <br /> preparation and analytical r iettiods employed for the samples The LCS%recovery data 1s used for <br /> U + validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Jennie Higgins and are not used to accept or refect batch results <br /> Project Manager <br /> 4 <br />' 4111013 GEC <4> <br /> ' <br /> I <br /> , <br /> I II <br />