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' SEQUOIA ANALYTICAL <br /> 81 • <br /> 9 Striker Avenue, Suite 8 Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> RESNA l :,.,...,.. <br /> :.................}........ ;:{«<:: nix .:: <br /> ustries Clierit l'�aiect kD: Arco#548, Stocktfln <br /> 3164 Gold Camp Dr., Suite 200 Matrix: Water <br /> Rancho Cordova,CA 95670 <br /> ;Attention. Greg Altlmari OC Sample Gaup: 303-0932 Reported Apr 9 1993 <br />• QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Oil&Grease <br /> Method: EPA 602 EPA 602 EPA 602 EPA.602 SM5520EF <br /> Analyst: Chiaravalloti Chiaravalloti Chiaravalloti Chiaravalloti N.Valdes <br /> Concentration <br /> Spiked: 10 ng/mL 10 ng/mL 10 ng/mL 30 ng/mL 13 <br /> LCS Batch#: LCSO40293 LCSO40293 LCSO40293 LCSO40293 BLK040793 <br /> Date Prepared: 4/2/93 4/2/93 4/2/93 4/2/93 4/7/93 <br /> Date Analyzed 4/2/93 4/2/93 4/2/93 4/2/93 4/9/93 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 61-412 <br />•l� LCS % <br /> Recovery: 86 87 83 86 77 <br /> Control Limits: 80-120 80.120 80.120 80-120 75-120 <br />• MS/MSD <br /> Batch#: 3030980 3030980 3030980 3030980 BLK040793 <br /> Date Prepared: 4/2/93 4/2/93 4/2/93 4/2/93 4/7/93 <br /> Date Analyzed 4/2/93 4/2/93 4/2/93 4/2/93 4/9/93 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 61-412 <br /> Matrix Spike <br /> %Recovery: 88 92 92 95 77 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 90 94 94 95 77 <br /> Relative% <br /> Difference: 2.2 2.2 2.2 0.0 0.0- <br /> SEQUOIA ANALYTICAL Please Note: <br /> The LCS is a control sample of known,interferent tree matrix that is analyzed using the same reagents. <br /> preparation and analytical methods employed lot the samples. The LCS%recovery data is used for <br /> validation of sample batch results. Due to matrix effects,the OC limits for MS/MSD's are advisory only <br /> Michael R. Giles and are not used to accept or reject batch results. <br /> Laboratory Director <br />. 3030932.RES <3> <br />