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• • Sequoia 680 Chesapeake Dave Redwood City, CA 94063 (415) 364 9600 FAX(415) 364-9233 <br /> r� ` 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (9t6) 921 9600 FAX(916)921 0100 <br /> EMCON Associates Client project it) Arco 6100-95-4,Tracy <br /> 1433 N Market Blvd Matrix Sod <br /> Sacramento, CA 95834 <br /> Attention Claudio Avila QC Sample Group 507-0193 Reported Jul 12, 1995 <br /> (QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- Reactive Reactive <br /> Benzene Toluene Benzene Xylenes Lead Cyanide Sulfide <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 6010 SW-846 SW4346 <br /> Analyst- Chap/Chiar Chap/Chiar Chap/Chiar Chap/Chiar K Barta X Pina K Newberry <br /> Concentration <br /> Spiked' 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 50 mg/kg 0 20 mg/kg 10 mg/L <br /> LCS Batch# LCS071095 LCS071095 LCS071095 LCS071095 LCS071095 LCS071095 LCS071095 <br /> Date Prepared' 7/10/95 7/10/95 7/10/95 7/10/95 7/10/95 7/10/95 7/10/95 <br /> Date Analyzed 7/10/95 7/10/95 7/10/95 7/10/95 7/10/95 7/10/95 7/10/95 <br /> Instrument I D.# GCHP-1 GCHP-1 GCHP-1 GCHP-1 P-40 Manual Manual <br /> LCS % <br /> Recovery' 98 98 98 98 96 37 96 <br /> Control Limits 75-125 75-125 75-125 75.125 80-120 65-40 80.120 <br /> MS/MSD <br /> Batch # 5061595 5061595 5061595 5061595 5070214 N/A N/A <br /> Date Prepared: 7/10/95 7/10/95 7/10/95 7/10/95 7/10/95 N/A N/A <br /> Date Analyzed' 7/10/95 7/10/95 7/10/95 7/10/95 7/10/95 N/A N/A <br /> Instrument I D.#- GCHP-1 GCHP-1 GCHP-1 GCHP-1 P-40 N/A N/A <br /> Matrix Spike <br /> % Recovery. 97 98 97 98 97 N/A N/A <br /> Matrix Spike <br /> Duplicate% <br /> Recovery' 104 105 105 105 92 N/A N/A <br /> Relative% <br /> Difference: 70 69 79 69 52 N/A N/A <br /> SEQUOIA ANALYTICAL -Please Note <br />. The LCS is a control sample of known,rntarlerent free matrix that is analyzed using the same reagents, <br /> rr� preparation and analytical methods employed for the samples The LCS�recovery data is used for <br /> i� validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 5070193 EMG <4> <br />