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SEQUOIA ANALYTIC <br /> / AL <br /> 1900 Bates Avenue • Suite LM • Concord,California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> 1'110 <br /> otniuAssoclates` V` r + v `Cljent'P'ro'ject-1D`V Arco 2093-98-1/Tracy 'J <br /> 1855 Gateway Blvd , Ste 770 Matrix Soil <br /> Concord, CA 94520 <br /> Attention Paul Sample QC Sample Group 307-1301 Reported Aug 5, 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 J F J F J F J F <br /> Conc Spiked- 040 040 040 12 <br /> Units. mg/Kg mg/Kg mg/Kg m9/K9 <br /> ' LCS Batch#: 1LCS080493 1LCSW0493 1LCS080493 1LCSOW493 <br /> Date Prepared: 8/4/93 8/4/93 8/4/93 8/4/93 <br /> Date Analyzed. 8/4/93 8/4/93 8/4/93 8/4/93 <br /> nstrument I D #' HP-2 HP-2 HP-2 HP-2 <br /> 10 LCS <br /> Recovery: 99 97 99 102 <br /> Control Limits: 70-130 70-130 70-130 70-130 <br /> r {nk ` t r r + ♦r r <br />' MS/MSD <br /> Batch# 3070019 3070019 3070019 3070019 <br /> Date Prepared 8/4/93 8/4/93 8/4/93 8/4/93 <br /> Date Analyzed• 8/4/93 8/4/93 8/4/93 8/4/93 <br /> nstrument I.D.#. HP-2 HP-2 HP-2 HP-2 <br />' Matrix Spike <br /> %i Recovery 100 97 100 100 <br />' Matrix Spike <br /> Duplicate% <br /> Recovery 97 95 97 99 <br /> Relative% <br /> Difference- 3 0 21 30 10 <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/MSDs are advisory only <br /> and are not used to accept or reject batch results <br /> Kenneth K F Lee <br /> Laboratory Director <br />' 3071296 ROU <2> <br />