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a)- Sequoia J Chesapeake Drive Redwood City,CA 94063 1415) 364.9600 FLAX(415) 3649233 <br /> 404 N. Wigct Lane Walnut Creek,CA 94596 (510) 988.9600 ' fAX(510)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921.9600 FAX (916)921.0100 <br /> bel-Tech ::«...:...>.::.:>:;::..:.:::::..:: .. .:..... ....: . .. <br /> ClientProject ID: Disco Slie <br /> 10624 Olive Ave. Matrix: Water <br /> Oakdale, CA 95361 <br /> Attention Don Light QC Sample Group 7060445-7060452 Reported: Jun 27, 1997. <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE: 1,1-Dichloro- Chloro- <br /> ethene 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: 50ug/L 50ug/L 50u9/L 50jrg/L 50ug/L <br /> LCS Batch#: LCS062697 LCS062697 LCS062697 LCS062697 LCS062697 <br /> Date Prepared: 06/26/97 06/26/97 06/26/97 06/26/97 06/26/97 <br /> {date Analyzed: 06/26/97 06/26/97 06/26/97 06/26/97 06/26/97 <br /> Instrument I.D.#: MS-F1 MS-F1 MS-F1 MS-F1 MS-F1 <br /> LCS % <br /> Recovery: 107 127 117 129 121 l <br /> Control Limits: 65-135 70.130 70-130 70-130 70.130 <br /> MS/MSD <br /> Batch #: SS062697 BS062697 BS062697 BS062697 BS062697 <br /> Date Prepared: 06/26/97 06/26/97 06/26/97 06/26/97 06/26/97 <br /> Date Analyzed: 06/26/97 06/26/97 06/26/97 06/26/97 06/26/97 <br /> Instrument I.D.#: MS-F1 MS-F1 MS-F1 MS-F1 MS-171 <br /> Matrix Spike <br /> % Recovery: 124 127 132 115 118 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 102 117 105 122 111 <br /> Relative % <br /> Difference: 19 8.2 23 5.9 6,1 <br /> Please Note: <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL 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/MSG's are advisory only <br /> and are not used to accept or reject batch results. <br /> inch C. Schneider <br /> Project.Manager/Sacramento Laboratory <br /> 7060445.DDD [9> <br /> rGi <br />