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Is Data VAkll,(circle) (YES Preservation Temperature 3.4(°C) stantec Stantec Lab Validation Form-Soil and Water Matrix Project/Client: Tidewater Stockton Project No.: 211602384.500.9401 Lab Work Order No.: Kiff#82960 Date of Validation: 12/05/12 Date of Analysis: 10/16/12 through 10/17/12 Date of Sampling: 10/18/12 through 10/23/12 Completed By: Alejandra Hernandez Circle/Highlight Signature: -- — - -- Yes or No 1. Was the analysis the one requested? es No 2. Do the sample number(s) on the chain-of-custody (COC) match the one(s) that es No appear on the laboratory data sheet? 3. Were samples prepared (extracted, filtered, etc.) within EPA holding times? Yes No 4. Once prepared/extracted, were the samples analyzed within the EPA holding times? es No 5. Were Laboratory blanks performed, if so, were they below non-detect? Yes . No 6. Are the units correct? (i.e., soil samples in mg/kg or pg/g, water samples mg/L, lag/L, es ; No and air samples in volume mg/m^3,etc.) 7. Were appropriate Matrix Spike (MS) and Matrix Spike Duplicate (MSD) samples es .No included in the laboratory batch sample? 8. In lieu of MS/ MSD, were surrogate spike (SS)/surrogate spike duplicate (SSD), or es No laboratory control spike (LCS)/laboratory control spike duplicate (LCSD) samples included in the laboratory batch samples? 9. Were MS/ MSD (or SS/SSD) within the acceptable range of% recovery (i.e., approx Xes No 80-120% depending on analyte)? 1) and 2) 10.Were MS/MSD (or SS/SSD) values used to calculate Relative Percent Difference es No (RPD)? 11. Were Relative Percent Difference values within the acceptable range (i.e. ± 25%)? 1) Yes ' No If any answer is no, explain why and what corrective action was taken: 1) The MS/MSD and RPD values associated with samples MW-69, MW-70, and QCEB-2-RM for the analyte benzene were outside of the stated QC limits. The samples were affected by the analyte concentrations already present in the un-spiked sample. This may indicate a possible bias for the reporting accuracy and precision. The LCS percent recovery was within QC limits indicating accuracy in reporting. Since there is no RPD value to confirm precision in reporting,the reported benzene may be biased;however, benzene values are within historical limits. 2) The MS/MSD associated with samples MW-71 through MW-74, QCDUP-4, QCTB-1, QCTB-2, QCEB-I-PV, QCEB-2-PV, and QCEB-1-RM for the analyte P +M xylene was outside of the stated QC limits for percent recovery. This may indicate a possible bias for the reporting accuracy. The LCS percent recovery was within QC limits indicating accuracy in reporting. RPD values were within QC range in the MSD indicating precision in reporting. The reported values are considered valid.