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Alpha VAnaIytical Laboratories Inc. e-mail: clipntservices@alpha-labs.com CHEMICAL EXAYIINATION REPORT Page 50 of 50 URS Corp - Sac 2870 Gateway Oaks Dr., Suite 300 Sacramento, CA 95833 Attn: Chani Leimbach Order Number Receipt Date/Time Client Code 07JO352 10/06/2007 13:00 URS -SAC Report Date: 10/22/07 07:09 Proj ect No: 18600251.02041 Project ID: DTSC 1~MS24 Phase 2 Notes and Definitions R-01 The Reporting Limit for this analyte has been raised to account for matrix interference. Client PO/Reference QM -4X The spike recovery was outside of QC acceptance limits for the MS and/or MSD due to analyte concentration at 4 times or greater the spike concentration. The QC batch was accepted based on LCS and/or LCSD recoveries within the acceptance limits. QM -05 The spike recovery was outside acceptance limits for the MS and/or MSD due to matrix interference. The LCS and/or LCSD were within acceptance limits showing that the laboratory is in control and the data is acceptable. QM -04 High RPD and/or poor percent recovery may reflect sample non -homogeneity. QM -03 The spike recovery was high for this analyte. The batch was accepted based on a non -detect for the analyte. QM -01 The spike recovery for this QC sample is outside of established control limits possibly due to a sample matrix interference. QL-03 Although the LCS/LCSD recovery for this analyte is outside of in-house developed control limits, it is within the EPA recommended range of 70-130%. DET Analyte DETECTED ND Analyte NOT DETECTED at or above the reporting Limit NR Not Reported dry Sample results reported on a dry weight basis RPD Relative Percent Difference PQL Practical Quantitation Limit Corporate. 208 Mason St., Ukiah, CA 95482 • Phone: (707) 468-0401 • Fax: (707) 468-5267 Service Center: 6398 Dougherty Rd., Suite 3, Dublin, CA 94568 • Phone: (925) 828-6226 • Fax: (925) 828-6309 6 T Alpha VAnaIytical Laboratories Inc. e-mail: clipntservices@alpha-labs.com CHEMICAL EXAYIINATION REPORT Page 50 of 50 URS Corp - Sac 2870 Gateway Oaks Dr., Suite 300 Sacramento, CA 95833 Attn: Chani Leimbach Order Number Receipt Date/Time Client Code 07JO352 10/06/2007 13:00 URS -SAC Report Date: 10/22/07 07:09 Proj ect No: 18600251.02041 Project ID: DTSC 1~MS24 Phase 2 Notes and Definitions R-01 The Reporting Limit for this analyte has been raised to account for matrix interference. Client PO/Reference QM -4X The spike recovery was outside of QC acceptance limits for the MS and/or MSD due to analyte concentration at 4 times or greater the spike concentration. The QC batch was accepted based on LCS and/or LCSD recoveries within the acceptance limits. QM -05 The spike recovery was outside acceptance limits for the MS and/or MSD due to matrix interference. The LCS and/or LCSD were within acceptance limits showing that the laboratory is in control and the data is acceptable. QM -04 High RPD and/or poor percent recovery may reflect sample non -homogeneity. QM -03 The spike recovery was high for this analyte. The batch was accepted based on a non -detect for the analyte. QM -01 The spike recovery for this QC sample is outside of established control limits possibly due to a sample matrix interference. QL-03 Although the LCS/LCSD recovery for this analyte is outside of in-house developed control limits, it is within the EPA recommended range of 70-130%. DET Analyte DETECTED ND Analyte NOT DETECTED at or above the reporting Limit NR Not Reported dry Sample results reported on a dry weight basis RPD Relative Percent Difference PQL Practical Quantitation Limit Corporate. 208 Mason St., Ukiah, CA 95482 • Phone: (707) 468-0401 • Fax: (707) 468-5267 Service Center: 6398 Dougherty Rd., Suite 3, Dublin, CA 94568 • Phone: (925) 828-6226 • Fax: (925) 828-6309