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SEQUOIA ANALYTICAL 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 (916) 921-9600 • FAX (916) 921.0100 4�n J t�'�r3y rf S . hY•S x s x..err. x r .fJ{^��+�/H+vw,�NDN��FF r1 f F•N"'*^ nr+!^-� {Fsr ..ti v�}l'1..�.ry..v LYll�i%�f��+.vn.j`�.f': J-..{Y � .:.%.fiJG,..c2o rl,„.,.s��iuCJJusv •, t, a.�, �igio�`�'D'est, fnc Client Project rD S teff, i41.�M Dorado, $tacicton, CA 50 Melody lane, Ste 160 Matrix Water Roseville, CA 95678 Attention Paul Graff QC Sample Group 4040118 Reported Apr 18, 1994 QUALITY CONTROL DATA REPORT ANALYTE Chloro- 11-Dichicroethens Trichloroethene Benzene Toluene benzene Method: EPA 624 EPA 624 EPA 624 EPA 624 EPA 624 Analyst' S Hoffmann S Hoffmann S Hoffmann S Hoffmann S Hoffmann Concentration Spiked: 50 ug/L 50 ug/L 50 ug/L 50 ug/L 50 ug/L LCS Batch#. N/A N/A N/A N/A N/A Date Prepared' N/A N/A N/A N/A N/A Date Analyzed, NIA N/A N/A N/A N/A Instrument 1 D #. N/A N/A N/A N/A N/A LCS% Recovery N/A N/A N/A N/A N/A Control Limits, DL-234 71-157 37-151 47-150 37-160 MS/MSD Batch#. 940458841 944458801 940458801 940458801 940458801 Date Prepared: 4/13/94 4/13/94 4/13/94 4/13/94 4/13/94 Date Analyzed: 4/13/94 4/13/94 4/13/94 4/13/94 4/13/94 Instrument I.D.#' MSF3 MSF3 MSF3 MSF3 MSF3 Matrix Spike %Recovery* 96 88 92 84 88 Matrix Spike Duplicate% Recovery- 98 90 94 92 92 Relative % Difference: 21 23 2 2 91 44 Please Note The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents, SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The LCS%recovery data is used for validation of sample batch results Due to matrix effects,the OC limits for MS/MSD's are advisory only *'Lj/nd"a� and are not used to aces t or re ect batch results Schneider Project Manager 4040118 FUG <8>