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j SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> i{Ciet� Pti ojc2S t Aa.r.c.,o# 0 63„v9.-,1`uiAssociates " .fvrc .r.rw wwl-unv � +n• r t, °h:.°.°wr''a%}�'s <br /> v <br /> 1855 Gateway Blvd , Ste 770 Matrix Soil <br /> Concord, CA 94520 <br /> Attention Paul Supple OC Sample Group 3070572-574 Reported Jul 23, 1993 <br /> rry .J u } '6'.w,}I,ly r 4 Y kr r vh.a,n.. r v r f .n�Fp n x ` ..• v}v n • r} r r v h r ry vv <br /> +F r v r v w r r n r a • <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br />' Analyst J F J F J F J F <br /> Conc. Spiked 040 040 040 12 <br /> Units mg/Kg mg/Kg mg/Kg mg/Kg <br />' LCS Batch# 1LCS072193 1LCS072193 1LCS072193 1LCS072193 <br /> Date Prepared- 7/21/93 7/21/93 7/21/93 7/21/93 <br /> iDate Analyzed 7/21/93 7/21/93 7/21/93 7/21/93 <br /> nstrument I D #' HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> 10 Recovery. 93 94 97 gg <br /> Control Limits 70-130 70-130 70-130 70-130 <br />�v rvC♦ v . vim.} M1 r t rC 4 v v v }ry vry r` ,ry Mvnr ~ rn r. { L it t s v tri w rA ♦hr C Y ` .. <br /> }f+ J `C`♦ v r r r r <br />' MS/MSD <br /> Batch#. 3070842 3070842 3070842 3070642 <br /> Date Prepared: 7/21/93 7/21/93 7/21/93 7/21/93 <br />' Date Analyzed 7/21/93 7/21/93 7/21/93 7/21/93 <br /> nstrument l.D #: HP-2 HP-2 HP-2 HP-2 <br /> Matrix Spike <br />' % Recovery 85 90 95 98 <br /> Matrix Spike <br />' Duplicate% <br /> Recovery 85 90 95 98 <br />' Relative% <br /> Difference. 00 00 00 00 <br /> EOUOIA ANA L 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 results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> and are not used to accept or reject batch results <br /> enneth F Lee <br /> boratory Director <br />' 3070572 ROU <2> <br /> I <br />