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t Sequoia <br />Analytical <br />684 Chesapeake Drive Rcawood City CA 94063 (4151 364 96W FAX 1415) 364 9:33 <br />19(t(1 !Sates Avenue Suite L Cnmcmrd CA 44"0 f5101 686 9600 FAX (510) 686 9F89 <br />819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br />ebroundwater Technology Client Project ID. Chevron #9-2033, Stockton, CA <br />1401 Halyard Drive, Suite 140 Matrix Soil <br />West Sacramento, CA 95691 <br />Attention Jason Fedota QC Sample Goup 5031072-1109 <br />QUALITY CONTROL DATA REPORT <br />ANALYTE Ethyl - <br />Benzene Toluene Benzene Xylenes <br />a <br />Reported Apr 4, 1995- <br />Method: <br />EPA 8020 <br />EPA 8020 <br />EPA 8020 <br />EPA 8020 <br />Analyst: <br />C Chapman <br />C Chapman <br />C Chapman <br />C Chapman <br />Concentration <br />Spiked- <br />0 20 mg/kg <br />0 20 mg/kg <br />0 20 mg/kg <br />0 60 mg/kg <br />LCS Batch#. <br />LCS032795 <br />LCS032795 <br />LCS032795 <br />LCS032795 <br />Date Prepared- <br />3/27/95 <br />3/27/95 <br />3/27/95 <br />3/27/95 <br />Date Analyzed <br />3/27/95 <br />3/27/95 <br />3/27/95 <br />3/27/95 <br />Instrument I.D.#: <br />GCHP-1 <br />GCHP-1 <br />GCHP-1 <br />GCHP-1 <br />LCS <br />Recovery <br />y <br />100 <br />95 <br />95 <br />ss <br />Control Limits: <br />75-125 <br />75-125 <br />75.125 <br />755-125 <br />jour , 4J.4 uy rp, <br />r } xy..p <br />vr-Y 4.* ,..n v vC.4v <br />{ ry S{ Yr r r}r v., <br />b+ n, r rv. }. }ri+ 345Y++4 J'{3i''O' 4tl • C\ ^ vn 1 ,SgCv 4u 4•xw Ykv.4 <br />Yu <br />�i).3 <br />h rvwiiam v +v. v .vrxw v. fir, 4 n n}4+ <br />v v. 4 n w n r v., nv <br />rv,? }"` , wx x ua4.` ,u4• <br />} v }, > > v4• rx x4, <br />Nx ox u v r . x aAx VOx4r W 4�>.4w 4a wrx rr } , w mT•m ,v � � v r <br />MS/MSD <br />Batch #: <br />5031072 <br />5031072 <br />5031072 <br />5031072 <br />Date Prepared <br />3/27/95 <br />3/27/95 <br />3/27/95 <br />3/27/95 <br />Date Analyzed. <br />3/27/95 <br />3/27/95 <br />3/27/95 <br />3/27/95 <br />Instrument I.D.#: <br />GCHP-1 <br />GCHP-1 <br />GCHP-1 <br />GCHP-1 <br />Matrix Spike <br />% Recovery. <br />100 <br />95 <br />95 <br />95 <br />Matrix Spike <br />Duplicate % <br />Recovery <br />95 <br />95 <br />95 <br />93 <br />Relative % <br />Difference: <br />51 <br />00 <br />00 <br />21 <br />SEQUOIA ANALYTICAL <br />1 <br />Linda C Schneider <br />Project Manager <br />Please Note <br />The LCS is a control sample of known interferent tree 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 CC limits for MS/MSDs are advisory only <br />and are not used to accept or reject batch results <br />0 <br />5031072 GRW <16> <br />