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�• SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> RESNA Industries Client Project ID #38012-15/Former Unocal #2859 <br /> 3164 Gold Camp Dr, Suite 200 Matrix Water <br /> Rancho Cordova,CA 95670 <br /> Attention Richard Alden CC Sample Group 3060250-256 Reported .Jun 14, 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 10 10 30 <br /> Spiked ug/L ug/L ug/L ug/L <br /> LCS Batch#• LCS060893 LCS060893 LCS06M3 LCS060893 <br /> Date Prepared. 6/8/93 6/8/93 6/8/93 6/8/93 <br /> Date Analyzed: 6/8/93 6/8/93 6/8/93 6/8/93 <br /> Instrument I D #. HP-2 HP 2 HP-2 HP-2 <br /> LCS% <br /> Recovery- 103 99 92 105 <br /> Control Limits 60-120% 80-120% 80-120% 80-120% <br /> MS/MSD <br /> Batch#- 3068145 3060145 3060145 3060145 <br /> Date Prepared 5/8/93 6/8/93 6/8/93 6/8/93 <br /> Date Analyzed, 6/8/93 6/8/93 6/8/93 6/8/93 <br /> Instrument I.D.#. HP-2 HP-2 HP-2 HP-2 <br /> Matrix Spike <br /> % Recovery 100 100 100 90 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery* 100 100 108 90 <br /> Relative <br /> Difference: 00 00 00 00 <br /> Please Note <br /> i 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 /> validation of sample batch results Due to matrix effects the QC limits for MS/MSD s are advisory only <br /> rc� <br /> and are not used to accent or reiect batch results <br /> Wendy Amundsen <br /> Laboratory Director 3060250 RES <3> <br />