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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'iEnvironm <br /> ental Consultants Client Project iD Shelf, 141 iV El Dorado, Stockton <br /> 050 Melody Lane, Ste 160 Matrix Water <br /> eville, CA 95678 <br /> Attention Paul Graff OC Sample Group 308-0131 Reported Aug 11, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene benzene xytenes <br /> Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: Ch3aravallati Chiaravallotr Chiaravailob Chiaravaiioti <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#- LCS080693 LCS080693 LCS080693 LCS080693 <br /> Date Prepared: 8/6/93 8/6/93 8/6/93 8/6/93 <br /> Date Analyzed: 8/6/93 8/6/93 8/6/93 8/6/93 <br /> Instrument I D.# HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery- 99 100 99 100 <br /> 00intsol Limits' 80-120 80.120 80-120 80.120 <br /> MS/MSD <br /> Batch # 3080035 3080035 3080035 3080035 <br /> Date Prepared: 8/6/93 8/6/93 8/6/93 8/6/93 <br /> Date Analyzed: 8/6/93 8/6/93 8/6/93 8/6/93 <br /> Instrument I.D.#. HP 2 HP-2 HP-2 HP-2 <br /> Matrix Spike <br /> %Recovery. 94 96 98 95 <br /> Matrnc Spike <br /> Duplicate% <br /> Recovery- 98 99 100 100 <br /> Relative% <br /> Difference: 42 31 20 51 <br /> Please Mote <br /> The LCS is a control sample of known,interterent 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 /> 14 validation of sample batch results Due to matnx effects the OC limas for MS/MSD s are advisory only <br /> and are not used to accent or reject batch results <br /> Linda C Schneider <br /> Project Manager 3080131 AEG <4> <br />