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Lodi City Landfill November 16,2011 North ofAwani Drive,Lodi,California Project No. 104690061 14. QUALITY ASSURANCE/QUALITY CONTROL Field duplicates involve collecting two separate samples of the same matrix at the same time and same location, and using the same sampling procedures to document that sampling techniques are consistent and are not influencing the analytical results. However, wastes are inherently het- erogeneous, therefore, even if two samples are collected the same exact way and side by side,the analytical results will be different and may not be comparable because the materials that com- pose the fill are inherently different. Field duplicates of wastes are therefore not a reliable indicator of accuracy,representativeness, or precision and will not be collected. A trip blank generally involves a solution that is put into the same type of sampling container that will be used for the environmental sample and kept with the set of sample containers both before and after sample collection. Samples of wastes collected as part of this assessment are solid, not liquid samples, and will be collected into containers that are not used for liquid sam- ples; therefore trip blanks are not applicable to this investigation. The proposed sample collection methodology does not require using sampling equipment; therefore, equipment blanks are not required.Numerous solid waste disposal site investigations conducted for CalRecycle throughout California have not included field duplicates, trip or equipment blanks. Two background samples of the volcanic rocks from each site will be collected and analyzed for total metal concentrations. Data validation of the analytical testing will be conducted and include the following: • Sample holding time, • Sample methods, • Analytical method, • Sample preservation, • Chain-of-custody records, • Detection limits, • Possible transcription errors, • Surrogate recoveries, • Matrix spike recoveries and matrix spike duplicate recoveries,and • Calibration checks. 104690061 R 8neUm 36 /�/Inya /Nnuce