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SEQUOIA ANALYTICAL <br /> GW Chesape+lce Dare • Redwood City.CA 94063 <br /> (415)364-9600 FAX(415)364.9233 <br /> Waterwork Client Project I0: W0601.tE,City d Stockton.WP RR <br /> 1710 Main Street <br /> Escalon.CA 95320 Reported: Mar 26 19A2 <br /> Attention: Bill Channell OC Sam a Group: 2033036-58 <br /> DUALITY CONTROL DATA REPORT <br /> YTE Nk*iW vanadium+ 23r+e Arsenic SOW"" <br /> Method: EPA 200.7 EPA 200.7 EPA 2017 EPA a fte �mad»� ��" t.C"W s <br /> Analyst C.McOafsafar C ►Afrdelewr C ANdsf+a�ar C Maoaf+aaar "q/L <br /> Reporting Units: "v/L "v/L ff*/L "v/L ��20, ��-1992 24. Ism <br /> Date Analyzed: Mar 20, Ism � 2fa '� ~" �` = 1992 � MW 2yay.�737 �2o�srsr <br /> OC Sample*: 2W-M x`10°° 233-30W 2034= <br /> Sample Conc.: N.D. 0.10 <br /> N.D. N.D. 0.17 N.D. N.D. <br /> Spike Cont. t.0 1.0 1.0 0.10 0.10 <br /> Added: 1.0 1.0 <br /> Cont. Matrix1 1 0.92 1.1 12 0.087 0.099 <br /> Spike: 0.99 <br /> Matrix Spike 100 92 110 103 07 99 <br /> %Recovery: 99 <br /> Cont.Matrix 1.1 0.92 1.0 12 0.086 0.099 <br /> Spike Dup.: 0.98 <br /> Matra Spike <br /> Duplicate 100 92 t00 103 86 99 <br /> %Recovery. 98 <br /> Relative 0.0 0.0 9.5 0.0 1.2 0.0 <br /> %Difference: 1.0 <br /> SEQUOIA ANALYTICAL a'°°r.rY Of M.S.-Cam.of Sam+f� 10D <br /> a a <br /> Spas Care.AdOao <br /> fiala4w%t2ttaron0a: Conn.of M.S.-Cone.of M.S.O. RICO <br /> If:4nc.of M.S. • Cont.O1 M.S.0.1 2 <br /> 2033M.WAT 047 <br /> ext Mar.., <br />