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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:5186 Instrument ID: HP 5972 MS <br /> B37 Shaw Road Matrix:Water Prepared: 10-30-02 <br /> Stockton, CA 95215 Analyst: Scott Foster Analyzed: 10-30-02 <br /> Attn:Tim Cuellar Reported: 11-07-02 <br /> QUALITY CONTROL DATA REPORT <br /> SPIKE ID: VWMS-0302 <br /> Reporting BLANK Spiking Control %R <br /> Limit Result Level Spike Limits <br /> !L IL IL %R <br /> COMPOUNDS <br /> t-But i Alcohol(t-BA) 20 ND 75.0 96.4% 55.3-153 <br /> ' Methyl t-butyl ether MTBE 0.50 ND 2.50 97.6% 60.4-137 <br /> Diiso ro I ether(DIPE) 0.50 ND 2.50 90.8% 70.5-131 <br /> Ethyl t-Bu I ether(ETBE) 0.50 ND 2.50 84.0% 72.1 -131 <br /> t-Am I methyl ether(TAME) 0.50 ND 2.50 88.8% 71.7-119 <br /> ' 1,2-Dichloroethane 1,2-DCA 0.50 ND 2.50 89.6% 63.6-138 <br /> Ethylene dibromide ED8 0.50 ND 2.50 98.8% 66.7-129 <br /> Surrogates: <br /> 1,2-Dichloroethane-d4 10.0 96.8% 10.0 110% 1 59.2-135 <br /> • Toluene-d8 10.0 1 106% 10.0 1 102% 62.9-132 <br /> v <br /> Spiking MATRIX MATRIX %R %RPD-" <br /> ' Level SPIKE SPIKE DUP Limits <br /> IjgJL %R %R <br /> COMPOUNDS <br /> t-BU l Alcohol(t-BA) 75.0 103% 144% 55.3-153 32.7% <br /> ' <br /> Methyl t-butyl ether MTBE 2.50 98.8% 102% 60.4-137 2.69% <br /> Diiso rop l ether DIPE 2.50 110% 108% 70.5-131 2.55% <br /> Ethyl t-Bu i ether ETBE 2.50 104% 100% 72.1 -131 3.92% <br /> t-Am I methyl ether TAME 2.50 92.8% 92.0% 71.7-119 0.778% <br /> 1,2-Dichloroethane 1,2-DCA 2.50 79.2% 96.0% 63.6-138 18.9% <br /> Ethylene dibromide(EDB) 2.50 106% 115% 66.7-129 8.70% <br /> Surrogate: <br /> 1,2-Dichloroethane-d4 10.0 97.0% 119% 59.2-135 20.4% <br /> ' Toluene-d8 10.0 101% 110% 62.9-132 8.80% <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 /> C J. Cone Jame ip <br /> Lab tory Director <br /> i <br />