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SEQUOIA ANALYTICAL <br /> ` 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> r`rirorr+ ♦ r r ,. x + u u 1 t,� +f+ r +v �+ + 5` 'Y My vrin ryr+ii+H r <br /> Aeg#s Ernnmental Consultants Client Protea ID Shell, 141AN EI Dorado, Stockton <br /> 1050 Melody lane, Ste 160 Matrix Water <br /> Roseville, CA 95678 <br /> Attention Paul Graff OC Sample Group 310-0227 Reported Oct 15, 1993 <br /> QUALM CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene benzene Xylenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst, Chiaravailoti Ci'izravallob C11,-:rav Toil Chiaraval:ob <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#• LCS101193 LCS101193 LCS101193 LCS101193 <br /> Date Prepared- 10/11/93 10/11/93 10/11/93 10/11/93 <br /> Date Analyzed: 10/11/93 10/11/93 10/11/93 10/11/93 <br /> Instrument LD # HP2 HP2 HP2 HP2 <br /> LCS % <br />. Recovery- 102 103 103 104 <br /> Control Limits* 80-120 80-120 80-120 80-120 <br /> MS/MSD <br /> Batch# 3100180 3100180 3100160 3100180 <br /> Date Prepared 10/11/93 10/11/93 10/11/93 10/11/93 <br /> Date Analyzed: 10/11/93 10/11/93 10/11/93 10/11/93 <br /> Instrument LD #- HP2 HP2 HP2 HP2 <br /> Matrix Spike <br /> % Recovery: 100 99 96 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 110 110 100 103 <br /> Relative% <br /> Difference: 95 11 41 60 <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 re ect batch results <br /> r Linda C Schneider <br /> Project Manager 3100227 AEG <2> <br />