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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue e Suite LM Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> Loux-Ms"O'clit6s `{ n v}+i+ 2093--W-1 <br /> yr v .. }~ >>" 4 <br /> Gient'Pl=oject�D i"Arco " `< <br /> 1855 Gateway Blvd , Ste 770 Matrix Sod <br /> Concord, CA 94520 <br /> Attention Paul Supple OC Sample Group 3071054-60 Reported Jul 30, 1993 <br /> v ~ �-,. .x s . Y v } r r vr4 r {}v 4 m rr.n vrrn xry rli.v♦. 4}i '. ~ r{v4�fi } i. r <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method. EPA 6020 EPA 8020 EPA 8020 EPA$020 <br /> Analyst J F J F J F J F <br /> Conc. Spiked 0 40 0 40 040 12 <br /> Units mg/Kg mg/Kg mg/Kg mg/Kg <br />' LCS Batch#: 2LCS072793 2LCS072793 2LCS072793 2LCS072793 <br /> Date Prepared 7/27/93 7/27/93 7/27/93 7/27/93 <br /> Date Analyzed. 7/27/93 7/27/93 7/27/93 7/27/93 <br /> nstrument LD #: HP-4 HP4 HP-4 HP4 <br /> LC % <br /> Recovery: 93 93 95 98 <br /> Control Limits 70-130 70-130 70-130 70-130 <br />' MS/MSD <br /> Batch# 3070799 3070799 3070799 3070799 <br /> Date Prepared: 7/27/93 7/27/93 7/27/93 7/27/93 <br /> IDate Analyzed: 7/27/93 7/27/93 7/27/93 7/27/93 <br /> nstrument I D.#: HP4 HP-4 HP-4 HP-4 <br /> Matrix Spike <br /> %Recovery- 85 87 90 92 <br /> Matrix Spike <br />' Duplicate% <br /> Recovery 82 85 a5 88 <br /> Relative% <br /> Difference. 36 23 57 44 <br /> EQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> greRELWB 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 /> and are not used to accept or reject batch results <br /> enneth K F Lee <br /> Laboratory Director <br />' 3071054 ROU <3> <br />