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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364.9233 <br /> t 40414.Wiget lane Walnut Creek,CA 94598 (510) 988-9600 FAX(Si0)988-9673 <br /> l,y� Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921.9600 FAX(916)921-0100 <br /> i=MCC)I Associates '' .... ' ' " ` ' Client Project l l]: Arco'21 es; Stockton" <br /> 1433 N. Market Blvd. Matrix: Soil <br />' Sacramento, CA 95834 p p............ _�5`' <br /> Attention: Claudio Avila CC Sample Group 5081517-1521 Reported: Se 13, 1 <br /> t <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method: EPA 8020 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#: LCS090895 LCS090895 LCS090895 LCS090895 <br /> Date Prepared: 9/8/95 9/8/95 9/8/95 9/8/95 <br /> Date Analyzed: 9/8/95 9/8/95 9/8/95 9/8/95 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % <br /> Recovery: 99 98 99 98 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> ;.::::.:... ......... <br /> Him <br /> MS/MSD <br /> Batch #: 5081545 5081545 5081545 5081545 <br /> Date Prepared: 9/8/95 9/8/95 9/8/95 9/8/95 <br /> ' Date Analyzed: 9/8/95 9/8/95 9/8/95 4/8/95 <br /> Instrument l.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> ' Matrix Spike <br /> %Recovery: 98 97 98 95 <br /> Matrix Spike <br /> ' Duplicate% <br /> Recovery: 98 96 96 96 <br /> Relative% <br /> Difference: 0.0 1.0 0.0 1.0 <br /> /project <br /> UOIA ANALYTICAL ease Note: <br /> ��� / �n�`'� The LCS Is a control sample of known,interferent lrae matrix that is analyzed using the same reagents, <br /> 7 [. !/Gpreparation 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 OC limits for MS/MSD's are advisory only <br /> a C. Schneider and are not used to accept or reject batch results. <br /> Manager 5081517.EMC <3> <br />