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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue a Suite LM • Concord,California 94520 <br /> jqV <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> z.,. ..vx ,.. �L, ,..,,.H.,, <br /> ux Associates A h` ' '}Ghent P'ro)ectrli�` t"Arco# 130= }1f,rStocliton' <br /> x} <br /> 1855 Gateway Blvd , Ste 770 Matrix Sod <br /> i Concord, CA 94520 <br /> Attention Paul Supple QC Sample Group 3090632-533 Report99 <br /> Reported Sep 20, 13 <br /> riw.Y r< rt . . v. ttr<r. urtir Yr tt r� <br />' QUALITY CONTROL DATA REPORT <br /> ALYTE Ethyl- MC <br /> Benzene Toluene Benzene Xylenes Lead <br /> Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 7421 <br /> Analyst J F J F J F J F D Ballard <br /> Conc. Spiked 040 040 040 12 10 <br />' Units m9/K9 m9/K9 mg/K9 mg/K9 m9/L <br /> LCS Batch#' 3LCS091693 3LCS091693 3LCS091693 3LCS091693 BLK091793 <br /> Date Prepared 9/16/93 9/16/93 9/16/93 9/16/93 9/17/93 <br /> Date Analyzed- 9/16/93 9/16/93 9/16/93 9/16/93 9/20/93 <br /> Instrument I D# HP-5 HP-5 HP-5 HIP-5 SpectrAA400 <br /> LCS % <br /> Recovery 129 122 116 112 87 <br /> Control Limits 70-130 70-130 70-130 70-130 75-125 <br /> q i� r�i kh�v . r �{.'.+Oi" ♦�iY 4 } v+y� ii.}.i.s .!+L I <br />' MS/MSD <br /> Batch#. 3090664 3090664 3090664 3090664 3090632 <br />' Date Prepared 9/16/93 9/16/93 9/16/93 9/16/93 9/17/93 <br /> Date Analyzed: 9/16/93 9/16/93 9/16/93 9/16/93 9/20/93 <br /> Instrument I D.#: HP-5 HP-5 HP-5 HP-5 SpectrAA-400 <br />' Matrix Spike <br /> % Recovery: 127 117 112 110 71 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 132 120 112 110 80 <br />' Relative% <br /> Difference: 38 25 00 00 12 <br /> SEQUOIA ANA YTICAL Please Note _ <br /> The LCS is a control sample of known,interferent free matnx that is analyzed using the same reagents, <br /> re aration and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation o 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 KF Lee <br /> Laboratory Director <br /> 3090632 ROU <3> <br />