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Preservation Temperature <br /> 2.1 -3.3(°C) <br /> Stantec <br /> Stantec Lab Validation Form-Soil and Water <br /> Matrix <br /> Project/Client: Tidewater Stockton <br /> Project No.: 211602258.400.779 <br /> Lab Work Order No.: Kiff#78379 <br /> Date of Validation: 08/22/11 <br /> Date of Analysis: 08/09111 through 08/18/11 <br /> Date of Sampling: 08108/11 <br /> Completed By: Alejandra Hernandez <br /> — Circle/Highlight <br /> Signature: – Yes or No <br /> 1. Was the analysis the one requested? H <br /> 2. Do the sample number(s) on the chain-of-custody (COC) match the one(s)that <br /> appear on the laboratory data sheet? <br /> 3. Were samples prepared (extracted,filtered, etc.) within EPA holding times? i <br /> 4. Once prepared/extracted, were the samples analyzed within the EPA holding times? E <br /> 5. Were Laboratory blanks performed, if so, were they below non-detect? <br /> 6. Are the units correct? (i.e., soil samples in mg/kg or pg/g, water samples mg/L, Ng/L, <br /> and air samples in volume mg/m^3,etc.) <br /> 7. Were appropriate Matrix Spike (MS) and Matrix Spike Duplicate (MSD) samples <br /> included in the laboratory batch sample? <br /> 8. In lieu of MS/ MSD, were surrogate spike (SS)/surrogate spike duplicate (SSD), or <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 <br /> 80-120% depending on analyte)? 1) <br /> 10.Were MS/MSD (or SS/SSD) values used to calculate Relative Percent Difference <br /> (RPD)? <br /> 11. Were Relative Percent Difference values within the acceptable range (i.e. ± 25%)? <br /> If any answer is no, explain why and what corrective action was taken: <br /> 1) The MSD associated with sample MW-51 for the analyte benzene was outside of the stated quality control(QC)limits for percent recovery. This <br /> may indicate a possible bias for the reporting accuracy. The LCS percent recovery and RPD values were within QC limits indicating accuracy <br /> and precision in reporting;therefore,the reported values are considered valid. <br />