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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P O Box 1360, Winton, CA 95388 Phone (209) 384-2930 <br /> Certificate No 2079 Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Nomellirn Construction Method TPH-Mesel <br />' of Northern California Reference Number 860 Instrument ID HP-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 8-28-96 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 8-29-96 <br /> Attn Tim Cuellar Reported 8-30-96 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br />' Spike Concentration 250 <br />' Units uglL <br /> LCS Batch # TPHDW 8286 <br />' LCSA % Recovery 88 8% <br /> LCSB % Recovery 904% <br /> Control Limits 55-130 % <br /> Relative % Difference 1 79% <br /> MSIMSD Batch # See note <br /> MS % Recovery See note <br /> MSD % Recovery See note <br /> Relative % Difference See note <br />' Note Insufficient sample material to prepare MSIMSD samples LCS samples prepared in duplicate <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 MSIMSD's are advisory only and are not used to accept or <br />' reject batch results <br /> ANALYST APPROVED BY \ <br />' Clair J Cone J es PhrlGps <br /> Environmental Lab Director <br /> 1 <br />