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CASTLE ANALYTICAL LABORATORY Environmental Testing Services P.O. Box 1360, Winton, CA 95388 Phone: (209) 384-2930 Fax: (209) 384-1507 Advanced GeoEnvironmentat, Inc. Client Project ID: Saint Mary's High School Method: EPA 5030i8015M,8020 of Northern California Refarence Number: 942 Instrument ID: Var-GC1 1803 West March Lane, Suite A Matrix: Soil Prepared: 11-25-96 Stockton, CA 95207 Andlyst: Jim Phillips Analyzed: 11-25-96 Attn: Tim Cuellar Reported: 11-26-96 QUAL)T Y CONTROL DATA REPORT ANALYTE Gasoiine Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration: 2.00 20.0 20.0 20.0 40.0 Jr-JIS: rnglkg ug,'kg cgikg ug!kg ug'kg LCS Batch 4: VG-N25{3 'x 11 -1\1256 VB-N256 VB-N266 VB N253 LCS % Recovery: 101°0 105`io 11095 105% 10790 Surrogate Reccvery: 117% 112% 1129'0 112% 1'12?'6 Cont-ol LiMitS: 70-131 =k 70-130 ° 70-130 °c 70-130 c 70-130 c% MS/MSD Batch »: V13-N255 VB N256 VB-N2561 VB-N256 'v'B-N256 MS `,o Receverv: 67.2"-S 73.44m 75.9% 74.5% 72.4% Surrogate Recovery: 81.94'0 74.7 -c 74.7°; 74.7% 74.7% MSD % Recovery: 6 5.5 -6 79.09u 81.94'0 79.65! 77.5% Surrogate Recovery: 80.61110 3,2.4:c 32.490 82.4�,c B2.4% Relative °o Difference: 2.48% 7.41% 6.56°10 6.56% E 7640 Methanol Blank : ND ND ND NO ND Surrogate Recovery: 81.4% 81.4% 81.440 81.4% 81.4% Please Note: The LCS (Laboratory Check Sample) is a control sample of known, interferent free matrix that is fortified with representative analytes and analy2ed using the same reagents, prepara;ion and analytical methods employed for the samples. The LCS cio recovery is used for validation of sample hatch results. Due to matrix effects, the QC limits and recoveries for MSlMSD's are advisory only and are not used to accept or reject batch results. ANALYST: r �� 6)C-/f APPROVED BY: Clari J. Cone fne IPhillips nvlrOnmental Lab Director