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• j SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (816) 921 9600 • FAX (916) 921-0100 <br /> Brown Caldwell Client Project ID Arco 434-93-5, Lodi <br /> 723 S St Matrix Air <br /> Sacramento, CA 95814 <br /> Attention Mindy Wright OC Sample Group 3100085-086 Reported Oct 7, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene benzene x enes <br /> Method' EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst Chiaravallotl r',hiaravallotl Chlaravallob Choaravallotl <br /> Concentration 2 0 2 0 20 <br /> so <br /> Spiked mg/cubic m mg/cubic m mg/cubic m mg/cubic m <br /> LCS Batch#- BLK100693 BLK100693 BLKIW693 BLK100693 <br /> Date Prepared 10/6/93 10/6/93 10/6/93 10/6/93 <br /> Date Analyzed 10/6/93 10/6/93 10/6/93 10/6/93 <br /> Instrument I D #- HP 2 HP-2 HP 2 HP-2 <br /> LCS % <br /> Recovery 100 95 95 93 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> HF.4...w �x..Fi.Fwn4.w..•i..+.Tluri n ...,.x5.� .J " v r u,-. e n n u ,. v ♦ `n^5}`^''OT�n '" v Jw <br /> MS/MSD <br /> Batch #' BLK100693 OLK100693 BLX100693 BLK100693 <br /> Date Prepared' 10/6/93 10/6/93 10/6/93 10/6/93 <br /> Date Analyzed. 10/6/93 10/6/93 10/6/93 10/6/93 <br /> Instrument I D.#. HP 2 HP-2 HP 2 HP-2 <br /> Matrix Spike <br /> % Recovery' 100 95 95 93 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery* 105 100 100 102 <br /> Relative% <br /> Difference 49 51 51 92 <br /> Please Note <br /> The LCS Is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> OUOIA ANALYTICAL 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/MSO s are advisory only <br /> .yt,x(' and are not used 10 accept or re set batch results <br /> UncidafC Schneider �1 <br /> Project Manager <br /> 3100085 BRS <2> <br />