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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P 0 Box 1360, Winton, CA 95388 Phone (209) 384-2930 <br /> ' Certificate #2079 Fax (209) 384 1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Ripon Farm Service Method EPA 503018015M,8020 <br /> ' 1803 West March Lane, Suite A Reference Number 552 Instrument ID Var-GC1 <br /> Stockton, CA 95815 Matrix Water Prepared 10-1295 <br /> AIM Bob Marty Analyst Jim Phillips Analyzed 10-12-95 <br /> Reported 10 1695 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline Benzene Toluene Ethyl Benzene Total Xylenes <br /> ' Spike Concentration 100 100 100 1 00 2 00 <br /> Units ug/L ug/L uglL ug/L ug/L <br /> LCS Batch # VG 0125W VB-0125W VB-0125W VS-0125W VB 0125W <br /> LCS % Recovery 104% 107% 115% 110% 114% <br /> Surrogate Recovery 95 9% 989% 98 9% 989% 98 9% <br /> Control Limits 70 130 % 70 130 % 70-130 % 70-130 % 70 130 % <br /> ' MSIMSD Batch # VG-0125W VB 0125W V8-0125W VB 0125W VB-0125W <br /> MS % Recovery 899% 108% 72 2% 108% 113% <br /> Surrogate Recovery 91 5% 99 10/0 99 1% 99 1% 99 1% <br /> MSD % Recovery 88 4% 118% 82 5% 118% 124% <br /> Surrogate Recovery 949% 969% 969% 969% 96 90/a <br /> ' Relative % Difference 0885% 809% 889% 804% 862% <br /> ' Methanol Blank ND ND ND ND ND <br /> Surrogate Recovery 107% 110% 110% 110% 110% <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 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 /> Clan J ane J es C P xlps <br /> vrronmental Lab Director <br />