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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> � � 4 <br /> 'RESNA Client Project ID W0613 01,Tracy PublicSchool <br /> +1710 Main Street Matrix Water <br /> Escalon, CA 95320 - <br /> Attention John Lane QC Sample Group 3JB8201-3 Reported Oct 26, 1993 <br /> i } + � +.. ni,Y , + iia r ,v+Y+Y� ` � �; L 4 �r rV iY ,� N ter} r . . .`4 ` } + +i+♦ LO. Yr*n W 'n,+rhJf+i ,n <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene X enes <br /> Method: EPA 8020 FPA 8020 EPA 8020 EPA 8020 <br /> Analyst, R Geckler R Geckler R Geckler R Geckler <br /> Cone. Spiked: 10 10 10 30 <br /> Units- rig/L ug/L ug/L ug/L <br /> LCS Batch#: BLK101993 BLK101993 BLK101993 BLK101993 <br /> Date Prepared: - - _ <br /> Date Analyzed- 10/19/93 10/19/93 10/19/93 10/19/93 <br /> Instrument I D.#. GCHP-18 GCHP-18 GCHP-18 GCHP-18 <br /> LCS % <br /> Recovery 91 91 91 90 <br /> Control Limits- 80-120 80-120 80-120 80.120 <br /> MS/MSD <br /> Batch #' 3JS1502 WS 1502 US 1502 3J81502 <br /> Date Prepared: 10/19/93 10/19/93 10/19/93 10/19/93 <br /> Date Analyzed: 10/19/93 10/19/93 10/19/93 10/19/93 <br /> Instrument LD #: GCHP-18 GCHP-18 GCHP-18 GCHP-18 <br /> Matrix Spike <br /> % Recovery. 100 96 96 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery. 89 79 79 e0 <br /> Relative% <br /> Difference 12 19 19 19 <br /> SEQUOIA ANALYTICAL Please 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 OC limits for MS/MSD's are advisory only <br /> Vickie Tague and are not used to accept or reject batch results <br /> Project Manager 3J88201 WAT 42> <br />