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CASTLE ANALYTICAL LABORATORY <br />' Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone: (209)384-2930 <br /> Certificate#2480 Fax: (209)384-1507 <br /> Advanced GeoEnvironmentai, Inc. Client Project ID:Grewals Market Method:EPA 5030!8260 <br />' of Northern California Reference Number;6597 Instrument ID:HP 5972 MS <br /> 837 Shaw Road Sample Description:Water Prepared: 02-06-04 <br /> Stockton,CA 95215 Analyst: Scott Foster Analyzed: 02-06-04 <br /> Attn:Tim Cuellar Reported: 02-12-04 <br /> QUALITY CONTROL DATA REPORT <br />' SPIKE ID: VWMS-2064 <br /> Reporting BLANK Spiking Control %R <br /> Limit Result Level Spike Limits <br /> !L IL !L %R <br /> COMPOUNDS <br /> t-But l Alcohol t-BA 20 ND 75.0 70.2% 55.3- 153 <br /> ' <br /> Methyl t-but I ether (MTBE) 0.50 ND 1 2.50 86.0% 60.4- 137 <br /> Diiso ro 1 ether(DIPS) 0.50 ND 2.50 98.0% 70.5- 131 <br /> Ethyl t-But l ether ETBE 0.50 ND 2.50 96.0% 72.1 - 131 <br /> t-Am I methyl ether(TAME) 0.50 ND 2.50 92.0% 71.7- 119 <br /> 1,2-Dichloroethane 1,2-DCA 0.50 ND 2.50 80.4% 63.6- 138 <br /> Ethylene dibromide EDB 0.50 ND 2.50 88.0% 66.7-129 <br /> Surrogates: <br /> 1,2-Dichloroethane-d4 1.0 80.0% 10.0 97.5% 59.2- 135 <br /> Toluene-d8 1.0 109% 10.0 113% 62.9- 132 <br /> Spiking MATRIX MATRIX %R %RPD <br /> Level SPIKE SPIKE DUP Limits <br /> IL %R %R <br /> COMPOUNDS <br /> t-But I Alcohol(t-BA 75.0 47.1% 54.6% 55.3-153 11.8% <br /> ' <br /> Methyl t-but I ether (MTBE) 2.50 69.6% 74.0% 60,4- 137 5.93% <br /> Diiso ro I ether RIPE) 2.50 105% 92.4% 70.5- 131 13.0% <br /> Ethyl t-But I ether ETBE 2.50 88.0% 90.0% 72.1 - 131 2.25% <br /> t-Am 1 methyl ether(TAMEJ 2.50 72.4% 76.4% 71.7- 119 4.83% <br /> 1,2-Dichloroethane(1,2-DCA) 2.50 66.0% 69.2% 63.6- 138 4.65% <br /> Ethylene dibromide(EDB) 2.50 80.8% 82.8% 66.7- 129 2.44% <br /> Surrogate: <br /> 1,2-Dichloroethane-d4 10.0 85.5% 87.4% 59.2- 135 2.20% <br /> Toluene-d8 10.0 110% 107% 62.9-132 2.85% <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 MSIMSD's are advisory only and are not used to accept or --- <br /> reject batch results. <br /> ANALYST: APPROVED BY; <br /> Ciar one Jame hillips <br /> Lab atory Director <br />