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j SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord,California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> *UxAgsoctates' :rCtdrow�ti.e l#c� *MO, <br /> wr$r.0 n-.9.w$-` t Arco#h .3r wb-,rSrrrteoc�..k,nt.oa,re <br /> }i 1855 Gateway Blvd , Ste 770 Matrix Sol[ <br /> r Concord, CA 94520 <br /> Attention Paul Supple OC Sample Group 3050212-221 Reported May 17, 1993 k <br /> 'rN�y"��` "'', 4 rry wr rv.vxr'4 ♦ic raw nrxr ry r v r r vs„irM1. . r1.r. ` ♦Aht ~ " w�rv�r`rr. tir x <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method. EPA 8020 EPA 8020 EPA 8020 EPA 802G <br /> Analyst P Madden P Madden P Madden P Madden <br /> Conc.Spiked 020 020 020 040 <br /> Units mg/kg mg/kg mg/kg mg/kg <br /> LCS Batch# M8051493 MB051493 M13051493 M8051493 <br /> Date Prepared 5/14/93 5/14/93 5/14/93 5/14/93 <br /> Date Analyzed 5/14/93 5/14/93 5/14/93 5/14/93 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % <br /> Recovery 89 93 91 96 <br /> Control Limas 80-120% 80-120% e0-120% 80-120% <br /> MS/MSD <br /> Batch # MS3050119 MS3050119 MS3050119 MS3050119 <br /> Date Prepared 5/14/93 5/14/93 5/14/93 5/14/93 <br /> Date Analyzed: 5/14/93 5/14/93 5/14/93 5/14/93 <br /> Instrument I D #. GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> %Recovery: 118 116 128 108 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 98 92 95 86 <br /> Relative% <br /> Difference 19 23 30 23 <br /> SEQUOIA N LYTICAL Please mote <br /> The LCS is a control sample of known,Interferent free matrix that is analyzed using the same reagents, <br /> re !ration and analytical methods employed for the samples The LCS%recovery data Is used for <br /> validation of-wimple batch results Due to matnx effects,the OC limas for MS/MSUs are advisory only <br /> and are not used to accept or reject batch results <br /> Kenneth KF Lee <br /> Laboratory Director <br /> 3050212 ROU a37 <br />