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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P 0 Box 1360,Winton, CA 95388 Phone (209) 384-2930 <br /> Certificate No 2079 Fax (209) 384 1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Ripon farm Service Method TPH-Diesel <br /> ' 1803 West March Lane, Suite A Reference Number 552 Instrument ID HP-GC1 <br /> Stockton, CA 95815 Matrix Water Prepared 10-12-95 <br /> Attn Bob Marty Analyst Clan Cone Analyzed 10-12 95 <br /> Reported 10-16-95 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> ' Spike Concentration 250 <br /> Units uglL <br /> LCS Batch# TPHDW 0125 <br /> ' LCSA % Recovery 980% <br /> LCSB % Recovery 102% <br /> Control Limits 55-130 % <br /> Relative % Difference 416% <br /> ' MS/MSD 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 /> ' Please Note <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 /> reject batch results <br /> . ANALYST APPROVED BY -S2 <br />' C air J onemes C Phillips <br /> ledEnwronmental Lab Director <br /> 1 <br />