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` SEQUOIA ANALYTICAL <br /> ' 1900 Bates Avenue a Suite LM • Concord,California 94520 <br /> (510) 686-9600 • FAX(510) 686-9689 <br /> v + Ci ry ht + i `Frrrn ♦rwn r +r Snv r4`Niv<�vu r <br /> ux Associates "Client F'ioject ISS A'rcox#21` b=9 S4 t'0 ton <br /> f186i�' 5 Gateway Blvd , Ste 770 Matrix Soil <br /> Concord, CA 94520 <br /> Attention Paul Supple OC Sample Group 3080749-757 Reported Aug 24, 1993 <br />' QUALITY CONTROL DATA REPORT <br /> A E 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 /> Cone. Spiked 040 040 040 1 2 <br /> Units m9/Kg mg/Kg mg/K9 mg/Kg <br />' LCS Batch#. 2LCS082393 2LCS082393 2LCS082393 2LCS082393 <br /> Date Prepared 8/23/93 8/23/93 8/23/93 8/23/93 <br /> Date Analyzed: 8/23/93 8/23/93 8/23/93 8/23/93 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> 10 LCS % <br /> Recovery' 92 94 96 97 <br />' Control Limits: 70-130 70-130 70-130 70-130 <br /> rnM1 r.. i4 4 1 + nr r + r, vn r nnnti }> >}ry v n v ♦vv` M1 r vrrr4 + ♦ r }+'" v +} `+ 44 `r 4 <br /> rr vFCv Sv ♦ Y h [` ^nM Nv +}S3 <br />' MS/MSD <br /> Batch#. 3080755 3080755 3080755 3080755 <br /> Date Prepared, 8/23/93 8/23/93 8/23/93 8/23/93 <br /> Date Analyzed: 8/23/93 8/23/93 8/23/93 8/23/93 <br /> Instrument I D #. HP-4 HP-4 HP-4 HP-4 <br />' Matrix Spike <br /> %Recovery: 85 92 97 100 <br />' Matnx Spike <br /> Duplicate% <br /> Recovery: 82 90 95 100 <br />' Relative% <br /> Difference 36 2 2 21 0 0 <br /> SEQUOIA A ALYTICAL lease Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> re aration d 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 /> and are not used to accept or reject batch results <br /> Kenneth K F Lee <br />'Laboratory Director <br /> 3080749 ROU <3> <br />