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j SEQUOIA ANALYTICAL <br /> 680 Chesapeake <br /> Redwood City, CA <br /> (415) 364-9600 FAX (415) 364-9233 <br /> RESNA Vrvxu Gient,Project ID W0402 00, Holt Bros{ <br /> r 1710 Main Street Matrix Water <br /> Escalon, CA 95320 <br /> Attention John Lane 0C Sample Group 31E9602-3 Reported Oct 13, 1993 <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 Nipp M Nipp M Nipp M Nipp <br /> Conc. Spiked: 10 10 10 30 <br /> Unds: ug/L ug/L pg/L Mg/L <br /> LCS Batch#: BLK100493 BLK100493 BLK100493 BLK100493 <br /> Date Prepared: - - - - <br /> Date Analyzed: 10/4/93 10/4/93 10/4/93 10/4/93 <br /> instrument 1.1)#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery- 96 96 96 93 <br /> Control Limits: 80-120 80-120 80.120 80-120 <br /> Cn <br /> w..wr.,A b,.v•.,r v\ri4r}+.JFµ~^+.h�i..NJxti�t v rtii3 sv�r ""��r�ti.whbtix� rn r t �• �l n.v..avvti ti n tiv W`4 <br /> MS/MSD <br /> Batch#: 31E1901 31E1901 31E1901 31E1901 <br /> Date Prepared. - - - - <br /> Date Analyzed 10/4/93 10/4/93 10/4/93 10/4/93 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> %Recovery: 93 94 95 93 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 98 99 98 100 <br /> Relative% <br /> Difference. 52 52 31 73 <br /> I QUOIA ANALYTICAL Ptease Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> 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/M$D's are advisory only <br /> and are not used to accept or reject batch results <br /> Vickie Tague 31E9601 WAT <7> <br /> Project Manager <br />