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i <br /> � <br /> CASTLE, E ANALYTICAL LABORATORY <br />' Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone 1209) 384-2930 <br /> Fax {209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Cal Fuels Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 1193 Instrument ID Var GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 7-21-97 <br /> Stockton CA 95207 Analyst Jim Phillips Analyzed 7 21-97 <br /> Attn Tim Cuellar Reported 7-28 97 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> I <br /> Spike Concentration 100 1 00 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-7217W VB-7217W VB-7217W VB-7217W VB-7217W VB-7217W <br /> I LCS % Recovery 91% 950% 879% 92 1% 892% 922% <br /> Surrogate Recovery 100% 97 2% 972% 972% 972% 972% <br /> IControl Limits 70-130 % 70-130 % 70-130 % 70 130 % 70-130 % 70-130 % <br /> MS/MSD Batch # VG-7217W VB-7217W VB-7217W VB-7217W VB-7217W VB 7217W <br /> MS % Recovery 97 1% 123% 93 7% 909% 96 7% 948% <br /> Surrogate Recovery 107% 103% 103% 103% 103% 103% <br /> MSD % Recovery 942% 120% 91 6% 88 90/0 947% 936% <br /> Surrogate Recovery 106% 102% 102% 102% 102% 102% <br /> Relative % Difference 2 98% 1 96% 222% 207% 206% 1 27% <br /> IMethanol Blank ND ND ND ND ND NO <br /> Surrogate Recovery 965% 966% 96 6% 966% 966% 966% <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 /> - or tht, ...,... -rl-c LCS O/ . c . ---cd for�anda-on <br /> nilaiy2ed u5lriy ii ltl �prlie ieoyeilt5 preNareUon and o o_i yi,cai u,c tliuu5 c-yiGy2Ju f �p�1 Cu a a.. � <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 /> refect batch results <br /> I <br /> 1 � <br /> ANALYSTAPPROVED BY <br /> Cfarr J Cone Jan s C hr rps <br /> 56'vironmental Lab Director <br />