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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City,CA 94053 <br /> (415)364-9600 FAX(415)364.9233 <br /> 'Watnrwork Client Project ID 367/Chevron Stockton , <br /> `1714 Main Street <br /> Escalon.CA 95320 <br /> AAttention Tina LePage CC Sample Group 1063516-3518 Re rted Ju! S. 1991 <br /> r+ ar n♦3 c«a .rr1 fs ra+ysy 3 w . x 3'F.c .. h o o- wS'"s. .f VaxL'3 <br /> anacevw4.�•.weiwSsak�uw.6?.a•.a.«kwae.w...�.,wY .r ,.,w....r�'aa,...s .tum,�a.,e3.:3swS�k,�.s��'"�,d„�c X��:�aae.�� .i, yM"M <br /> OUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA SW EPA 8020 EPA 6020 EPA 8020 <br /> Analyst G Meyer G.Meyer G Meyer G Mayer <br /> Reporting Units ng ng ng ng <br /> Date Analyzed Jul 1. 1991 Jul 1. 1991 Jul 1 1991 Jul 1. 1991 <br /> CC Sample# GB1X 070191 GBLK 070191 GBLK 070191 GBLK 070191 <br /> Sample Cone.: N D N D N D N D <br /> Spike Cone. <br /> -- Added 100 100 100 300 <br /> Cone. Matrix <br /> Spike. 100 100 100 300 <br /> Matrix S-1ke <br /> %Recovery: 100 100 100 100 <br /> Cone Matrix <br /> Spike Dup : 100 100 100 300 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery. 100 100 100 100 <br /> Relative <br /> %Difference. 00 00 00 00 <br /> SEQUOIA ANALYTICAL. %Recovery Conc of M S Conc of Nample x 100 <br /> 5p�be Conc Added <br /> Relative%Chffarance Conc of M S Conc of M S 0 x 100 <br /> ;Polect <br /> eth ac { ane of til S + Cone of M 5 D) 2 <br /> Manager 1%3516wAT c2� <br />