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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (SIO) 988-9600 FAX(510)988-9673 <br /> l 819 Striker Avenue,Suite 8 Sacnmento,CA 95834 (916) 921.9600 FAX(916)921-0100 <br /> � F Analytica <br /> Pacific Environmental Group Client P..-Ject ID: Unocal #1205, Lathrop, CA <br /> 11315 Sunrise Gold Circle, Ste. M Matrix: Water <br /> Rancho Cordova, CA 95742 <br /> Attention: Rusty Benkosky QC Sample Group 711-1173 Reported: Dec 3, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE: 1,1-Dichloro- Chloro- <br /> ethane Trichloroethene Benzene Toluene benzene <br /> Method: EPA 8240 EPA 8240 EPA 8240 EPA 8240 EPA 8240 <br /> Analyst: K.Pocan K.Pocan K.Pocan K.Pocan K.Pocan <br /> Concentration <br /> Spiked: 50 Ng/L 50 Ng/L 50 Ng/L 50 Ng/L 50 Ng/L <br /> LCS Batch#: LCS112697 LCSl 12697 LCS112697 LCS112697 LCS712697 <br /> Date Prepared: 11/26/97 11/26/97 11/26/97 11/26/97 11/26/97 <br /> Date Analyzed: 11/26/97 11/26/97 11/26/97 11/26/97 11/26/97 <br /> Instrument I.D.#: MS-F1 MS-F1 MS-F1 MS-F1 MS-F1 <br /> LCS % <br /> Recovery: 132 109 117 124 99 <br /> Control Limits: 65-135 70-130 70-130 70-130 70-130 <br /> x. <br /> MS/MSD <br /> Batch#: 7110938 7110938 7110938 7110938 7110938 <br /> Date Prepared: 11/19/97 11/19/97 11/19/97 11/19/97 11/19/97 <br /> Date Analyzed: 11/19/97 11/19/97 11/19/97 11/19/97 11/19/97 <br /> Instrument I.D.#: 1AS-F1 MS-F1 MS-F1 MS-F1 MS-F1 <br /> Matrix Spike <br /> % Recovery: 104 98 102 98 93 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 112 105 111 104 100 <br /> Relative% <br /> Difference: 7.4 6.9 8.5 5.9 7.3 <br /> Please Note: <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA A LYTICAl 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 /> land are not used to accept or reject batch results. <br /> Linda C. Schne er l <br /> Project Manager/Sacramento Laboratory <br /> 7111173.PES <5, <br />