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i <br /> SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 e Sacramento, CA 95834 <br /> (916) 921-9600 + FAX (916) 921-0100 <br /> } , , ,r " " ,r x u r , ry N..N..1 .x x rvr r,SM1V <br /> Aegis Environmental Consultants Client Project ID Shell, 141 Nr El Dorado,Stockton` "`" .yx <br /> '" <br /> OR050 Melody Lane, Ste 160 Matn x Water <br /> oseville, CA 95678 <br /> Attention Paul Graff QC Sample Group 306-1018 Reported Jun 29, 1993 <br /> ,.unvv.v 4. v v vry .. r r ry .n n r v r v r n,.. . v •v.v.,.w v {$. rl,c'r+V�YN w.S'Jit'AWn%rGiv r�icr 4-w T r <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 M Chiaravalloti M Chiaravalioti M Chiaravallot M Charavalloti <br /> Concentration <br /> Spiked. 10 ug/l 10 ug/i 10 ug/I 30 ug/I <br /> LCS Batch#- LCS062993 LCS062893 LCS062893 LCS062893 <br /> Date Prepared- 6/28/93 6/28/93 6/28/93 6/28/93 <br /> Date Analyzed 6/28/93 6/28/93 6/28/93 6/28/93 <br /> Instrument I D #: HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery- 101 100 100 100 <br /> . Control Limits: 80-120 80.120 80-120 80-120 <br /> v r. v 4 . ,.x > ♦ r v w u w.vr...yrytl n yr •.rw'S0--.45{..,,.r w .. ..v <br /> r r {n <br /> + v}ry ry v ` x urs 04v.4vu Y.t M1vt my .wvL{. v v <br /> MS/MSD <br /> Batch# BLK062893 BLK062893 BLK062893 BLK062M <br /> Date Prepared: 6/28/93 6/28/93 6/28/93 6/28/93 <br /> Date Analyzed 6/28/93 6/28/93 6/28/93 6/28/93 <br /> Instrument I.D.#' HP-2 HP-2 HP-2 HP-2 <br /> Matrix Spike <br /> %Recovery: 97 99 98 90 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 100 100 100 95 <br /> Relative% <br /> Difference: 30 10 20 54 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL 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 /> er Amundsen <br /> boratory Director 3061018 AEG <2> <br />