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Sequoia 660 Chesapeake Dnve Redwood City CA 94063 (415) 36.1 9600 FAX(415) 364 9233 <br /> 404 N Wlget Lane Walnut Creek CA 94598 (5101 988 9600 FAX(510) 988 %73 <br /> Analytical 819 Stnkcr Avenue Suuc 8 Sacramento Ca 95834 (916) 921 9600 FAX(916)921 0100 <br /> Pacific Environmental Group, Inc Client Project ID Arco 2133,'Stockton <br /> 11315 Sunrise Gold Circle, #M Matrix Water <br /> Rancho Cordova, CA 95742 <br /> Attention Greg Barclay OC Sample Group 6031010-25 Reported Apr 3, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene X eves <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst CC/BW CC/BW CC/BW CC/BW <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS032896 LCS032896 LCS032896 LCS032896 <br /> Date Prepared 03/28/96 03/28/96 03/28/96 03/28/96 <br /> Date Analyzed 03/28/96 03/28/96 03/28/96 03/28/96 <br /> Instrument I D #: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> 0 Recovery 91 94 94 94 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> }4'm?nr'S• rrfi'r r:3"~J SSn J4v.: .v rrnv r !` n Jryx mrrrr v9ry w w. r o vnvsrn rnn4},h,i r.Qv' }An :srja.+:-n vvr} vi r Lam. nxn+nr } rx L.n rnt4v` <br /> MS/MSD <br /> Batch #- 6031018 6031018 6031018 6031018 <br /> Date Prepared 03/28/96 03/28/96 03/28/96 03/28/96 <br /> Date Analyzed 03/28/96 03/28/96 03/28/96 03/28/96 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> %Recovery 92 98 94 94 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery- 82 91 90 88 <br /> Relative % <br /> Difference 11 7 4 43 6 6 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that 1s analyzed using the same reagents <br /> preparation and analytical methods employed for the samples The LCS%recovery data 1s used for <br /> i L validation of sample batch results Due to matrix effects,the CC limits for MS/MSDs are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory <br /> 603101OPES <9> <br />