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' CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (209) 384-2930 <br /> Certificate #2079 Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Nomellini Construction Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 1710 Instrument ID Var-GC1 <br /> ' 4005 North Wilson Way Matrix Water Prepared 8-18-98 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 8-18-98 <br /> Attn Tim Cuellar Reported 8-25-98 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> 1 <br /> Spike Concentration 100 100 1 00 1 00 1 00 200 <br />' Units ug/L ug/L ug/L ug/L ug/L ug/L <br /> LCS Batch # VG-8188W VB-8188W VB-8188W VS-8188W VB-8188W VB-8188W <br />' LCS % Recovery 109% 124% 102% 102% 101% 101% <br /> Surrogate Recovery 964% 93 3% 933% 933% 933% 933% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch # VG-8188W VB-8188W VB-8188W VB-8188W VB-8188W VB-6188W <br />' MS % Recovery 100% 209% 99 1% 990% 996% 997% <br /> Surrogate Recovery 102% 97 8% 978% 978% 978% 978% <br />' MSD % Recovery 107% 495% 993% 989% 994% 993% <br /> Surrogate Recovery 100% 990% 990% 990% 990% 990% <br />' Relative % Difference 607% 769% 0 137% 0 147% 0187% 0442% <br /> Methanol Blank ND ND ND ND ND ND <br />' Surrogate Recovery 91 6% 91 7% 91 7% 91 7% 91 7% 91 7% <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 OC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> reject batch results <br /> ANALYST APPROVED BY <br /> C4Cone am C PhrNrps <br /> Envmonmenral Lab D,recior <br />