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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P O Box 1360, Winton, CA 95388 Phone (209) 384-2930 <br /> Certificate #2079 Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Nomellirn Construction Method EPA 503018015M,8020 <br /> of Northern California Reference Number 860 Instrument ID Var-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 8-28-96 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 8-28-96 <br />' Attn Tim Cuellar Reported 8-30-96 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 100 1 00 1 00 1 00 1 00 200 <br /> Units ug/L ug/L uglL uglL ug/L uglL <br />' LCS Batch # VG-8286W VB-8286W VB-8286W VB 8286W VB-8286W VB 8286W <br /> LCS % Recovery 104% 88 7% 96 1% 95 1% 92 7% 939% <br /> Surrogate Recovery 103% 99 6% 99 6% 996% 99 6% 99 6% <br /> Control Limits 70-130 % 70 130 % 70-130 % 70-130 % 70-130 % 70-130 % <br />' MS/MSD Batch # VG-8286W VB-8286W VB-8286W VB-8286W VB 8286W VB 8286W <br /> MS % Recovery 894% 214% 85 1% 907% 93 5% 908% <br /> Surrogate Recovery 106% 96 1% 96 1% 96 1% 96 1% 96 1% <br /> MSD % Recovery 96 3% 180% 854% 884% 909% 889% <br /> Surrogate Recovery 105% 102% 102% 102% 102% 102% <br /> Relative % Difference 6 81% 17 1% 0 151% 1 99% 2 57% 1 68% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 103% 102% 102% 102% 102% 102% <br /> The LCS (Laboratory Check Sample) is a control sample of known, interferent free matrix that is fortified with representative analytes and <br /> analyzed using the same reagents, preparation and analytical methods employed for the samples The LCS % recovery is used for validation <br /> of sample batch results Due to matrix effects, the QC limits and recoveries for MS/MSD s are advisory only and are not used to accept or <br /> refect batch results <br /> I ANALYST APPROVED BY <br /> Carr J Cone Ja s C Phr ips <br /> nvrronmental Lab Director <br />