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V_,� <br /> Is Data Vand�(circle) <br /> 'YES l Preservation Temperature <br /> NZS 0.4—3.1 (°C) <br /> Stantec <br /> Stantec Lab Validation Form-Soil and Water <br /> Matrix <br /> Project/Client: Tidewater Stockton <br /> Project No.: 211402828.300.250 <br /> Lab Work Order No.: Kiff#75022 <br /> Date of Validation: 11/04/10 <br /> Date of Analysis: 10/19/10 through 10/26/10 <br /> Date of Sampling: 10/19/10 <br /> Completed By: Alejandra Hernandez <br /> Circle/Highlight <br /> Signature: m ��� Yes or No <br /> 1. Was the analysis the one requested? ��'es'�No <br /> 2. Do the sample number(s) on the chain-of-custody (COC) match the one(s) that (Yes No <br /> appear on the laboratory data sheet? <br /> 3. Were samples prepared (extracted, filtered, etc.) within EPA holding times? ( 's)No <br /> r'- <br /> 4. Once prepared/extracted, were the samples analyzed within the EPA holding times? � s )No <br /> 5. Were Laboratory blanks performed, if so, were they below non-detect? ;Yes )No <br /> 6. Are the units correct? (i.e., soil samples in mg/kg or rag/g, water samples mg/L, fag/L, (; es ")No <br /> and air samples in volume mg/m^3,etc.) <br /> 7. Were appropriate Matrix Spike (MS) and Matrix Spike Duplicate (MSD) samples 'Ales-)No <br /> included in the laboratory batch sample? <br /> 8. In lieu of MS/ MSD, were surrogate spike (SS)/surrogate spike duplicate (SSD), or No <br /> No <br /> laboratory control spike (LCS)/laboratory control spike duplicate (LCSD) samples <br /> included in the laboratory batch samples? <br /> 9. Were MS/ MSD (or SS/SSD) within the acceptable range of% recovery (i.e., approx Yes No;% <br /> 80-120% depending on analyte)? 1), 2), and 3) <br /> 10.Were MS/MSD (or SS/SSD) values used to calculate Relative Percent Difference (�'es No <br /> (RPD)? -' <br /> � <br /> 11. Were Relative Percent Difference values within the acceptable range (i.e. ± 25%)? (Yes No <br /> If any answer is no, explain why and what corrective action was taken: <br /> 1) Matrix Spike(MS)and Matrix Spike Duplicate(MSD)results associated with samples MW-56,MW-57,MW-58,MW-61,MW-63,MW-68,MW-69, <br /> QCDUP-6,QCEB-I-RG,and QCTB-1 for the analytes Methyl-t-butyl ether(MtBE)and Tert-Butanol(TBA)were outside of the stated quality control(QC) <br /> limits for%recovery. This may indicate a possible bias for the reporting accuracy. The relative percent difference(RPD)values for MtBE and TBA are <br /> within range indicating precision in reporting. The laboratory control sample(LCS)recoveries were within QC limits,for the analytes MtBE and TBA, <br /> indicating accuracy in reporting. Therefore,the reported values are considered valid. <br /> 2) MS/MSD results associated with samples MW-23 through MW-26,MW-29,MW-30,MW-32 through MW-35,MW-44,MW-45,MW-51,and QCDUP-2 for <br /> the analyte MtBE were outside of the stated QC limits for%recovery. This may indicate a possible bias for the reporting accuracy. The RPD values are <br /> within range indicating precision in reporting. The LCS recoveries were within QC limits indicating accuracy in reporting. Therefore,the reported values are <br /> considered valid. Continued on next page <br />