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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 %73 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br />�EMCON Associates Client Project ID Arco 6100-95-4, Tracy <br /> 1433 N Market Blvd Matrix Soil <br /> Sacramento, CA 95834 <br /> Attention Claudio Avila OC Sample Group 5070195-204 Reported Jul 18, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method: EPA 6020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst. C Chapman C Chapman C Chapman C Chapman <br /> Concentration <br /> Spiked' 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch#- LCS071495 LCS071495 LCS071495 LCS071495 <br /> Date Prepared' 7/14/95 7/14/95 7/14/95 7/14/95 <br /> Date Analyzed. 7/14/95 7/14/95 7/14/95 7/14/95 <br /> Instrument I D #: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % <br /> Recovery 96 95 98 98 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # 5070020 5070020 5070020 5070020 <br /> Date Prepared- 7/14/95 7/14/95 7/14/95 7/14/95 <br /> Date Analyzed 7/14/95 7/14/95 7/14/95 7/14/95 <br /> Instrument I D.#: GCHP-1 GCHP-1 13CHP-1 GCHP-1 <br /> Matrix Spike <br /> %Recovery. 93 93 94 94 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 98 98 99 99 <br /> Relative% <br /> Difference. 52 5 2 52 52 <br /> SEQUOIA ANALYTICAL Please Note <br /> • The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> G�� K <br /> ���?��( preparation and analytical methods employed for the samplesThe LCS%recovery data 1s used for <br /> validation of sample batch results Due to matrix effects,the OC limits for MS/MSD's are advisory only <br /> 1 ncfa C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 5070195 EMC <3> <br />