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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 GeoEnvironmental, Inc. Client Project ID:Grewals Market Method: EPA 5030/8260 <br /> of Northern California Reference Number:4868 Instrument ID:VARIAN GCIMS <br /> 837 Shaw Road Matrix:Water Prepared: 07-17-02 <br /> Stockton,CA 95215 Analyst: Clari J.Cone Analyzed: 07-17-02 <br /> Attn:Tim Cuellar Reported: 07-23-02 <br /> QUALITY CONTROL DATA REPORT <br /> SPIKE ID: VVVMS-7172 <br /> Reporting BLANK Spiking Control %R <br />' Limit Result Level Spike Limits <br /> IL /L 1L %R <br /> COMPOUNDS <br /> t-But l Alcohol(t-BA) 20 ND 75.0 107% 41.8-168 <br /> Methyl t-hut I ether MTBE 0.50 ND 2.50 96.8% 62.4-127 <br /> Diisoprop I ether DIPS 0.50 ND 2.50 75.2% 51.4-151 <br /> Ethyl t-Bu I ether(ETBE) 0.50 ND 2.50 100% 57.4-138 <br /> t-Am I methyl ether(TAME) 0.50 ND 2.50 96.0% 60.2-122 <br /> 1,2 Dichloroe#have 1,2-DCA 0.50 ND 2.50 124% 69.7-124 <br /> Ethylene dibromide EDS 0.50 ND 2.50 107% 76.3-127 <br /> Surrogates: <br /> 1,2-Dichloroethane-d4 10.0 103% 10.0 103% 52.9-141 <br />' Toluene-d8 10.0 116% 10.0 99.7% 76.4-129 <br /> Spiking MATRIX MATRIX %R %RPD <br />' Level SPIKE SPIKE DUP Limits <br /> COMPOUNDS IL %R %R <br /> t-But I Alcohol(t-BA) 75.0 64.5% 83.9% 41.8-168 19.8% <br /> Methyl t-but i ether (MTBE) .2.50 NA* NA* 62.4-127 NA* <br /> Diiso ro I ether DIPS 2.50 82.8% 81.6% 51.4-151 1.43% <br /> Ethyl t-Butyl ether ETRE) 2.50 105% 924% 57.4-138 12.5% <br /> t-Am I methyl ether TAME 2.50 91.6% 37.6% 60.2-122 16.0% <br />' 1,2-Dichloroethane 1,2-DCA 2.50 84.0% 88.8% 69.7-124 5.380A <br /> Ethylene dibromide EDB 2.50 97.6% 88.8% 76.3-127 9.44% <br /> Surrogate: <br /> 1,2-Dirhloroethane-d4 10.0 98.1% 95.6% 52.9-141 2.58% <br />' Toluene-d8 10.0 99.8% 98.3% 76.4-129 1.51% <br /> "Recoveries not calculated due to matrix interference. <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 /> y <br /> ANALYST: OVED BY: (71 , <br />' Gari J. one Jarhiliips <br /> oratory Director <br />