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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> ESNA Industries Client Project lD R7120-93/Quik Stop#120, Stockton <br /> 3164 Gold Camp Dr, Suite 200 Matrix Water <br /> Rancho Cordova, CA 95670 <br /> Attention Rich Garlow OC Sample Group 3060790-792 Reported Jul 1, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene benzene X enes Diesel <br /> EPA <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 8015 Mod <br /> Analyst: M C M C M C M C M C <br />' Concentration 10 10 10 30 300 <br /> Spiked, ug/L ug/L ug/L ug/L ug/L <br /> LCS Batch# LCS062293 LCS062293 LCS062293 LCS062293 BLK062993MS <br /> Date Prepared. 6/22/93 6/22/93 6/22/93 6/22/93 6/29/93 <br /> Date Analyzed 6/22/93 6/22/93 6/22/93 6/22/93 6/30/93 <br />' Instrument I D.#: HP-2 HP-2 HP-2 HP-2 HP-3B <br /> LCS 96 <br /> Recovery: 102 102 102 102 113 <br /> Control Limits: 60-120 80-120 80-120 60-120 80-120 <br /> MS/MSD <br />' Batch#: 3060790 3060790 3060790 3060790 BLK062993 <br /> Date Prepared. 6/22/93 6/22/93 6/22/93 6/22/93 6/29/93 <br /> Date Analyzed 6/22/93 6/22/93 6/22/93 6/22/93 6/30/93 <br />' Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 HP-3B <br /> Matrix Spike <br />' %Recovery, too 100 100 90 113 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 110 110 110 95 107 <br /> Relative% <br />' D iHerence: 95 95 95 54 55 <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 sample$ The LCS%recovery data is used for <br /> �7 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 /> Wendy Amundsen tU� <br /> Laboratory Director 3os0790 RES <3> <br />