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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 e Sacramento, CA 95834 <br /> �y (916) 921-9600 a FAX (9/1�r6) 921-0100 <br /> r+Ff +fiK ;a S`O J HN '" �'C'G"�4 �''9Irn`'•r/sfJnr 3Y vwveyNl�?'N�3hY1.vVv xrYr{rC4vf wwv!%/lJJ.b$YyFK9WfiaVi.CFi�r .IF'nr( .4 t <br /> eg � ��nsuftants Client Proj r �I'ielf, 141 rN €I 13oracTo, Stockton, CA <br /> 050 Melody Lane, Ste 160 Matrix Air <br /> Roseville, CA 95678 <br /> Attention Paui Graff QC Sample Group 401-0193 Reported Jan 11, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> A Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst- Chiaravallob Chiaravalloti Chiaravalloti Chiaravalloti <br /> Concentration 20 20 20 60 <br /> Spiked: mg/cubic m mg/cubic m mg/cubic m mg/cubic m <br /> LCS Batch#: BLK010794 BLK010794 BLK010794 BLK010794 <br /> Date Prepared: 1/7/94 1/7/94 1/7/94 1/7/94 <br /> Date Analyzed: 1/7/94 1/7/94 1/7/94 1/7/94 <br /> Instrument I.D.#- HP2 HP2 HP2 HP2 <br /> LCS % <br />. Recovery: 85 95 100 100 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch#- BLK010794 BLK010794 ?LK010794 BLK010794 <br /> Date Prepared: 1/7/94 1/7/94 1/7/94 1/7/94 <br /> Date Analyzed: 1/7/94 1/7/94 1/7/94 1/7/94 <br /> Instrument I D.#: HP2 HP2 HP2 HP2 <br /> Matrix Spike <br /> %Recovery- 65 too 1u0 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 90 100 110 108 <br /> Relative% <br /> Difference: 57 51 95 77 <br /> J J The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects,the CC limits for M$/MSD's are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 4010193.AEGs <3> <br />