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Alpha VAnalytical Laboratories Inc. e-mail. clientservices@alpha-labs.com <br />CHEMICAL EXAMINATION REPORT Page 30 of 68 <br />URS Corp - Sac <br />2870 Gateway Oaks Dr., Suite 300 Report Date: 10/22/07 07:24 <br />Sacramento, CA 95833 Project No: 18600251.02041 <br />Attn: Chani Leimbach Project ID: DTSC FMS24 Phase 2 <br />Order Number Receipt Date/Time Client Code Client PO/Reference <br />07Jr0347 10/06/2007 13:00 URS -SAC <br />TPH by EPAILUFT GC/GCMS Methods - Quality Control <br />Spike Source %REC RPD <br />Analyte(s) Result PQL Units Level Result %REC Limits RPD Limit Flag <br />Batch AJ71201- VOAs in Water GCMS <br />Blank (AJ71201-BLKI) Prepared: 10/10/07 Analyzed. 10/11/07 <br />TPH as Gasoline ND 50 ug/1 - — <br />Surrogate: Toluene -d8 24.5 25.0 98.0 69-115 <br />LCS (AJ71201-BSI) Prepared: 10/10/07 Analyzed: 10/11/07 <br />TPH as Gasoline 195 50 ug/l 200 97.5 68-127 <br />Surrogate: Toluene -d8 25.3 " 25.0 101 69-115 <br />Matrix Spike (AJ71201-MS1) Source: 07J0258-01 Prepared: 10/10/07 Analyzed: 10/11/07 <br />TPH as Gasoline 107 50 ug/1 200 ND 53.5 37-156 - <br />Surrogate: Toluene -d8 24.8 " 25.0 99.2 69-115 <br />Matrix Spike Du (AJ71201-MSM) Source: 07JO258-01 Prepared: 10/10/07 Analyzed: 10/11/07 <br />TPH as Gasoline 130 50 ug11 200 ND 65.0 37-156 19.4 20 <br />Surrogate: Toluene -d8 <br />24.7 <br />25.0 98.8 69-115 <br />Batch AJ71538 - SVOAs in Water GC <br />Blank (AJ71538-BLKI) <br />Prepared: 10/I5107 Analyzed: 1_0116/07 <br />TPH as Diesel <br />ND <br />50 ug/l <br />Surrogate: Tetratetracontane <br />99.6 <br />78.0 128 20-152 <br />LCS (AJ71538-BSI) <br />_ Prepared: 10/15/07 Analyzed: 10/16/07 <br />TPH as Diesel <br />1660 <br />- J <br />50 ug/I 2010 82.6 52-136 <br />Surrogate: Tetratetracontane 117 78.0 150 20-152 <br />LCS Dup (AJ71538-BSD1) Prepared: 10/15/07 Analyzed: 10/16/07 <br />The results in this report apply to the samples analyzed in accordance with the chain <br />of custody document. This analytical report must be reproduced in its entirety. —5 <br />Bruce Gove 10/22/2007 <br />Laboratory Director <br />Corporate: 208 Mason St-, Ukiah, CA 95482 - Phone: (707) 468-0401 - Fax: (707) 468-5267 <br />Service Center: 6398 Dougherty Rd., Suite 3, Dublin, CA 94568 - Phone: (925) 828-6226 - Fax: (925) 828-6309 <br />