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4640 Pecos Street I Unit C <br />' Denver, Colorado 80211 <br />303.433.1322 I Laboratory <br />303.265.96451 Fax LABORATORY <br />' E-21 Engineering Brian Woody <br />2695 South Raritan Project Number: 863 <br />' Englewood CO 80110-1126 Project: GeoCon BayShore <br />' Volatile Organic Compounds by EPA Method 82608 - Quality Control <br />Origins Laboratory, Inc. <br />' Reporting Spike Source %REC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch 7H20002 - EPA 5030B <br />Blank (7H20002-BLKI) Prepared: 08/20/2007 Analyzed: 08/20/2007 <br />Gasoline Range Hydrocarbons ND 500 ug/kg <br />' Methyl tert-Butyl Ether ND 5.0 <br />Benzene ND <br />5.0 <br />Toluene ND <br />5.0 <br />' Ethylbenzene ND 5.0 " <br />o-Xylene ND 5.0 <br />m,p-Xylene ND 10 " <br />' Surrogate: 1,2-Dichloroethane-d4 62.6 u91L 62.5 700 65-135 <br />Surrogate. Toluene-d8 69.7 62.5 171 65-135 <br />Surrogate:4-Bromofluorobenzene 58.1 62.5 93.1 65-735 <br />' LCS (7H20002-BS1) Prepared: 08/20/2007 Analyzed: 08/20/2007 <br />Benzene 230 5.0 ug/kg 200 115 65-135 <br />Toluene 230 5.0 200 117 65-135 <br />Surrogate:7,2-Dichloroethane-d4 63.5 ug/L 61.5 102 65-135 <br />Surrogate: Toluene-d8 77.7 62.5 774 65-135 <br />Surrogate:4-Bromofluorobenzene 59.4 62.5 95.7 65-735 <br />Matrix Spike (7H20002-MS1) Source: X708029-01 Prepared: 08/20/2007 Analyzed: 08/20/2007 <br />Benzene 190 5.0 ug/kg 200 ND 97.5 65-135 <br />Toluene 180 5.0 200 ND 89.7 65-135 <br />Surrogate: 1,2-Dichloroethane-d4 60.6 ug/L 62.5 96.9 65-135 <br />Surrogate: Toluene-d8 68.9 62.5 110 65-135 <br />Surrogate:4-Bromofluorobenzene 55.4 62.5 88.6 65-735 <br />Matrix Spike Dup (7H20002-MSD1) Source: X708029-01 Prepared: 08/20/2007 Analyzed: 08/21 /2007 <br />Benzene 170 5.0 ug/kg 200 ND 83.2 65-135 15.8 20 <br />' Toluene 160 5.0 200 ND 81.8 65-135 9.23 20 <br />Surrogate:7,2-Dichloroethane-d4 56.5 ug/L 62.5 90.4 65-135 <br />Surrogate: Toluene-d8 72.6 62.5 716 65-135 <br />' Origins Laboratory, Inc. <br />The results in this report apply to the samples analyzed <br />' in accordance with the chain of custody document. This <br />analytical report must be reproduced in its entirety. <br />Page 9 of I 1 <br />Noelle E Doyle, Laboratory Manager