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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> Iwo (916) 921-9600 • FAX (916) 921-0100 <br /> Ae isYEnvirtin <br /> 9 mental Consultants Client project ID Shefi, 141 N EI I�oratfo, Stockton <br /> 1050 Melody Lane, Ste 160 Matrix Water µ M1 M1 <br /> Roseville, CA 95678 <br /> Attention Paul Graff OC Sample Group 310-0798 Reported Oct 26, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene benzene X ones <br /> Method: EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst: Chiaravahoth Chiaravalloti Chiaravalioti Chiaravallob <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#- 1-CS102293 LCS102293 LCS102293 LCS102293 <br /> Date Prepared- 10/22/93 10/22/93 10/22/93 10/22/93 <br /> Date Analyzed. 10/22/93 10/22/93 10/22/93 10/22/93 <br /> Instrument I D.#, HP2 HP2 HP2 HP2 <br /> LCS % <br /> Recovery: 105 105 106 107 <br /> Control Limits 80-120 80-120 80-120 80-120 <br /> MS/MSD <br /> Batch# 3100710 3100710 3100710 3100710 <br /> Date Prepared: 10/22/93 10/22/93 10/22/93 10/22/93 <br /> Date Analyzed 10/22/93 10/22/93 10/22/93 10/22/93 <br /> Instrument I D.#- HP2 HP2 HP2 HP2 <br /> Matrix Sage <br /> %Recovery 100 100 100 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 100 100 100 100 <br /> Relative% <br /> Difference: 00 00 00 00 <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 />�r 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 reject batch results <br /> Linda C Schneider <br /> Project Manager 3100798 AEG <2> <br />