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I <br /> I CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services <br /> P O Box 1360, Winton, CA 95388 Phone (209) 384 2930 <br /> Certificate 42079 Fax {209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Cal Fuels Method TPH Diesel <br />' of Northern California Reference Number 975 Instrurnent ID HP GC1 <br /> 1803 West March Lane, Suite A Matrix Soil Prepared 12 27-96 <br /> Stockton, CA 95207 Analyst Clan Cone Analyzed 12 30-96 <br /> Attn Tim Cuellar Reported 1-7-97 <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br /> ANALYTE TPH Diesel <br /> Spike Concentration 5 0 <br />' Units mg(kg <br /> LCS Batch # TPHD D276 <br /> LCS % Recovery 93 1% <br /> Control Limits 60 130 % <br />' MSIMSD Batch # TPHD-D276 <br />' M5 D% Recovery 86 2% <br /> MS % Recovery 76 2% <br />' Relative % Difference 12 2% <br /> Please Nota <br /> ' The LCS {Laboratory Check Samplel 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 MSIMSD s are advisory only and are not used to accept or <br /> refect batch results <br /> ANALYST �L APPROVED BY <br /> Clary J Cone J es Phllbps <br /> Cnwronmental Lab Drrecior <br />