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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 ° FAX (916) 921-0100 <br /> Wegis'Environmental Consultants Client Project ID Shell, 141 N El Dorado, Stockton <br /> 1050 Melody Lane, Ste 160 Matrix Air <br /> Roseville, CA 95678 <br /> Attention Paul Graff QC Sample Group 309-0708 Reported Oct 7, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene benzene Xvienes <br /> Method- EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst. C Chapman C Chapman C Chapman C Chapman <br /> Concentration 20 2 0 2 0 6 0 <br /> Spiked. mg/cubic m mg/cubic m mg/cubic m mg/cubic m <br /> LCS Batch#- LCS092393 LCS092393 LCS092393 LCS092393 <br /> Date Prepared: 9/23/93 9/23/93 9/23/93 9/23/93 <br /> Date Analyzed 9/23/93 9/23/93 9/23/93 9/23/93 <br /> Instrument 1.13 #: HP-2 HP 2 HP-2 HP-2 <br /> LCS % <br /> Recovery, 105 so 105 105 <br /> Control Limits. 80-120 80-120 So-120 80-120 <br /> MS/MSD <br /> Batch#. BLK092393 BLK092393 BLK092393 BLK092393 <br /> Date Prepared. 9/23/93 9/23/93 9/23/93 9/23/93 <br /> Date Analyzed: 9/23/93 9/23/93 9/23/93 9/23/93 <br /> Instrument I D.#. HP 2 HP-2 HP-2 HP-2 <br /> Matrix Spike <br /> %Recovery: 1DO 100 100 98 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 105 100 105 98 <br /> Relative % <br /> Difference 49 00 4 9 0 0 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> EQUOIA 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 aeceot or reject batch results <br /> Linda C Schneider <br /> Project Manager 3090708 AEG <7> <br />