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j SEQUOIA ANALYTICAL <br /> - 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> �{+ (916) 921-9600 o FAX (916) 921-0100 <br /> A�egis Y✓Ei'n's Ww'SYron^^me�niiawiR CwnyCrcWtamn�ts^�wf-+CfJlienO tvProject <br /> rrci Dr� Shell, 1+✓4✓1v N Er+I Do+r ad ;+wStockton <br /> X050 +.{♦ Vw Y`n`"n'rriFrY+Y.+mir�r vi{✓x {SGn v' ftr vY{ <br /> {+ <br /> Melody Lane, Ste 160 Matrix Water <br /> Roseville, CA 95678 <br /> Attention Paul Graff QC Sample Group 309-0459 Reported Sep 22, 1993 <br /> vv vr+hnr ✓}+ v vx.n♦ M1.rr w . r } lu.x rrr 3n+ n x n ff w. r.✓ r v n r +r: yr v vrcxvxr•+ r r• +vv <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzeno Toluene benzene Neves <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Concentration <br /> Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#- LCS092093 LCS092093 LCS092093 LCS092093 <br /> Date Prepared- 9/20/93 9/20/93 9/20/93 9/20/93 <br /> Date Analyzed: 9/20/93 9/20/93 9/20/93 9/20/93 <br /> Instrument LD #• HP-2 HP 2 HP-2 HP-2 <br /> LCS % <br /> . Recovery 100 100 100 107 <br /> Control Limits: 80-120 80-120 80-120 80-120 <br /> MS/DASD <br /> Batch #. 3090494 3090494 3090494 3090494 <br /> Date Prepared. 9/20/93 9/20/93 9/20/93 9/20/93 <br /> Date Analyzed: 9/20/93 9/20/93 9/20/93 9/20/93 <br /> Instrument 1 D.#: HP-2 HP-2 HP-2 HP-2 <br /> Matrix Spike <br /> % Recovery 95 95 92 87 { <br /> Matrix Spike <br /> Duplicate % <br /> Recovery- 100 100 99 95 <br /> Relative % <br /> Difference 51 51 73 88 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA 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 QC limits for MS/MSC s are advisory only <br /> L and are not used to accept or reject batch results <br /> 1'3�6 <br /> Linda C Schneider <br /> Project Manager 3090459 AEG <4> <br />