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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921 0100 <br /> *Aegis Environmental Consultants Client Project ID 141 N EI Dorado, Stockton, CA <br /> 050 Melody Lane, Ste 160 Matrix Water <br /> Roseville, CA 95678 <br /> Attention Paul Graff OC Sample Group 306-0554 Reported Jun 15 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene benzene Xylenes; <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst M C M C M C M C <br /> Concentration 10 .0 10 30 <br /> Spiked: ug/L ug/L ug/L ug/L <br /> LCS Batch# LCS061493 LCS061493 LCS061493 LCS061493 <br /> Date Prepared. 6/14/93 6/14/93 6/14/93 6/14/93 <br /> Date Analyzed 6/14/93 6/14/93 6/14/93 6/14/93 <br /> Instrument I D # HP-2 HP-2 HP 2 HP-2 <br /> LCS % <br /> Recovery' 94 94 94 93 <br /> Control Limits- 80-120 80-120 80-120 80-120 <br /> MS/MSD <br /> Batch#- 3060597 3060597 3060597 3060597 <br /> Date Prepared 6/14/93 6/14/93 6/14/93 6/14/93 <br /> Date Analyzed 6/14/93 6/14/93 6/14/93 6/14/93 <br /> Instrument I D #- HP-2 HP 2 HP-2 HP 2 <br /> Matrix Spike <br /> % Recovery* 96 95 98 80 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 110 100 100 85 <br /> Relative% <br /> Difference: 16 51 20 61 <br /> Please Note <br /> The LCS m 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 OC limits for MS/MSD's are advisory only <br /> `^ and are not used to accept or resect batch results <br /> Wendy Amundsen <br /> Laboratory Director 3060554 AEC: <2> <br />