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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921.0100 yqy��p <br /> y.f . r r Ar. v { ' 6XVrk+i6'y' ,/ ^}tin .> nC wiC w'{ N•LOVIALG �{. i"r6�'.9rAiK'"[.i6. <br /> gis EiMronment&Consultants Client Project(D Shell, 1 a1 N'EI Dorado,Stockton,CA <br /> IM50 <br /> Melody Lane, Ste 160 Matrix Water x <br /> Roseville, CA 95678 <br /> Attention Paul Graff OC Sample Group 401-0194 Reported Jan 20, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE thyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method: EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst- Chiaravallotl Chiaravalloti Chiaravailob Chiaravallob <br /> Concentration <br /> Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS011994 LCS011994 LCS011994 LCS011994 <br /> Date Prepared: 1/19/94 1/19/94 1/19/94 1/19/94 <br /> Date Analyzed' 1/19/94 1/19/94 1/19/94 1/19/94 <br /> Instrument I.D.#' HP-2 HP-2 HP-2 HP-2 <br /> LCS% <br /> Recovery 106 105 106 106 <br /> Cordrol Limits. 80-120 80-120 80-120 80120 <br /> r r v ry4rx }aTh`4YK Hvyv{f <br /> M1 n r t 43}v nC <br /> MS/MSD <br /> Batch #: BLK011994 BLK011994 BLK011994 BLK011994 <br /> Date Prepared 1/19/94 1/19/94 1/19/94 1/19/94 <br /> Date Analyzed- 1/19/94 1/19/94 1/19/94 1/19/94 <br /> Instrument I.D,#: HP-2 HP-2 HP-2 HP-2 <br /> Matrix Spike <br /> %Recovery _ "e 107 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 100 100 100 93 <br /> Relative% <br /> Difference: 95 00 95 14 <br /> Twoo"!191111111111:1 _ <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 sampies The LCS 96 recovery data is used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSas aro advisory only <br /> nda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 4010194AEG <2> <br />