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j <br /> SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City, CA 94063 <br /> (415) 364-9600 - FAX(415) 364-9233 <br /> b�AI SY:`�Lko YS+Y'a."] •,II—n1 ,'?C" 7�J"':;r`7 fuG-xt nbrurfxo*Jksb .2]b�YYfR bt7 rYb fr^r"+ ^�rY?F F'^"`�^Y.+•'h sXl,'CKY4ro. ti`S*�.tilr. � Y S'a^s. <br /> .cv N.w,w w,ai fb`,00-<+w�oo..�xd��.kra4 o`i�v`2..Yerarr <br /> Waterwork Client Project ID 475,Weber Point <br /> -'l 710 Main Street <br /> yf Escalon, CA 95320 n <br /> ;ttAttention Tina LePage v,x W x OC Sample Group204-3707 <br /> u xNu ^wx, vAvv v y t Reported- Apr 27, 1992 x <br /> }`r$. ]eY+}Nl1Jm ^vvW wlrkxl..r rr +n]..w...w.mr.45vri v.C.en x.Jv m3Av.vNm-Avv v �]r�+ vv rat wrvr pY${rvv'env'V{fYFAT1CV�+v^ixFv�ii%�i.ivf' .ivt nu xti'�ix <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 M Mpp M Nipp M Mpp M Nipp <br /> Reporting Units pg/L pg/L pg/L pg/L <br /> ' Date Analyzed Apr 22, 1992 Apr 22, 1992 Apr 22, 1992 Apr 22, 1992 <br /> QC Sample# GBLK042292 GBLKG42292 GBLK042292 GBLK042292 <br /> Sample Conc.: N D N D N D N D <br /> Spike Conc. <br /> Added: 10 10 10 30 <br /> ' Conc. Matrix <br /> Spike: 92 92 92 28 <br /> ' Matrix Spike <br /> % Recovery: 92 92 92 93 <br /> ' Conc. Matrix <br /> Spike Dup.: 91 90 92 27 <br /> ' Matrix Spike <br /> Duplicate <br /> %Recovery: 91 90 92 90 <br /> ' Relative <br /> %Difference: 11 22 00 36 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> W� � ,, Relative%Difference Conc of M S -Conc of M S D x 100 <br /> rL ee v i (Conc of M S + Conc of M S D) 2 <br /> Project Manager 2043787 WAT <2> <br />