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to CASTLE ANALYTICAL LABORATORY <br />' Environmental"Testing Services 2333 Shuttle Drive,Atwater, CA 95301 Phone: (209)384-2930 <br /> Fax: (209)384-1507 <br /> Advanced GeoEnviron mental, Inc. Client Project ID:Grewals Market Method:EPA 5030/8260 <br />' of Northern California Reference Number.4300 Instrument ID: HP 5972MS <br /> 837 Shaw Road Matrix:Water Prepared: 12-26-01 <br /> Stockton,CA 95215 Analyst: Clari J. Cone Analyzed: 12-27-01 <br /> Attn:Tim Cuellar Reported: 01-02-02 <br /> QUALITY CONTROL DATA REPORT <br /> ' SPIKE ID: VWMS-D261 <br /> i <br /> Reporting BLANK Spiking Control %R <br /> Limit Result Level Spike Limits <br /> /L /L /L %R <br /> COMPOUNDS <br /> f-Bu I Alcohol (t-BA) 20 ND 75.0 144% 70-130 <br /> Methyl t-butyl ether (MTBE) 0.50 ND 2.50 102% 70-130 <br /> Diiso ro I ether(DIPE) 0.50 ND 2.50 96.0% 70-130 <br /> Ethyl t-Butyl ether ETBE 0.50 ND 2.50 88.0% 70-130 <br /> t-Am I methyl ether TAME 0.50 ND 2.50 97.2% 70-130 <br /> ' 1,2-Dichloroethane 1,2-DCA) 0.50 NO 2.50 120% 70-130 <br /> Ethylene dibromide(EDB) 0.50 ND 2.50 103% 70-130 <br /> Surrogates: <br /> • 1,2-Dichloroethane-d4 10 -9 6% 10.0 120% 70-130 <br /> T0luene-d8 10 119% 10.o 104% 70-130 <br /> Spiking MATRIX MATRIX %R %RPD <br /> Level SPIKE SPIKE DUP Limits <br /> /L %R %R <br /> COMPOUNDS <br /> t-But l Alcohol(t-BA) 75.0 95.6% 87.1% 70-130 8.63% <br /> Methyl t-butyl ether (MTBE) 2.50 121% 115% 70-130 4.94% <br /> Diiso ro lether(DIP E) 2.50 119% 114% 70-130 3.74% <br /> Ethyl t-But i ether(ETBE) 2.50 113% 111% 70-130 2.14% <br /> t-Am l methyl ether TAME 2.50 116% 116% 70-130 0.00% <br /> 1,2-Dichloroethane 1,2-0CA 2.50 122% 106% 70-130 13.6% <br /> Ethylene dibromide EDB) 2.50 104% 107% 70-130 2.27% <br /> Surrogate: <br /> ' 1,2-Dichloroethane-d4 10.0 106% 108% 70-130 2.06% <br /> Toluene-d8 10.0 108% 111% 70-130 3.10% <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 GC limits and recoveries for MSlMSD's are advisory only and are not used to accept or <br /> reject batch results. <br /> ' ANALYST: APPROVED BY: <br /> Clare J. Cone Jam C. ►!lips <br /> L ratory Director <br />