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The instruments and equipment will receive routine preventative maintenance. At a minimum, all instruments (including backup) will be inspected for usable condition and calibration status prior to each field use. 10.0 INSPECTION/ACCEPTANCE OF SUPPLIES AND CONSUMABLES Prior to acceptance, all supplies and consumables will be inspected by the contractor's assigned personnel to ensure that they are in satisfactory condition, are free of defects, and are free of potential sources of contamination with chemical compounds of interest. If defects are noted, the item will be replaced. The FPM or designated environmental personnel will inspect all supplies and consumables provided by subcontractors, including laboratories. 11.0 NON-DIRECT MEASUREMENTS Non-direct measurements include information from logbooks, site documents, photographs, topographic maps, and data from other sources that may be used to augment the dataset collected under this project and to assist in decision-making. The logbooks, data sheets, photographs, and topographic maps generated or utilized by the environmental contractor will be documented as specified in this QA/QC Plan. Information from external sources will be evaluated for any limitation on the data use and will be incorporated into project documents with concurrence of the project team, including DTSC. These sources will be identified in any project reporting documents and these documents will include relevant information on any such sources, including the original generator, associated QC, and limitations on use. 12.0 DATA MANAGEMENT Each data package and associated QA/QC information received from the State-certified analytical laboratory will be reviewed to confirm that data quality objectives have been met. The parameters to be reviewed will include: • Sample holding times; • Blank data; • Field duplicate data; • Surrogate recovery data; • MS/MSD data; and • Remarks provided by the laboratory. The sample holding times will be reviewed to ensure that the requested analyses were completed within the specified holding times for those analyses. The analytical results of field and/or laboratory blank samples that were analyzed will be checked for evidence of potential contamination. Accuracy of the reported results will be evaluated by checking the surrogate recoveries, and the MS/MSD spike recoveries against the specified QC criteria for the method. The precision of the reported results will be evaluated by checking the results of the MS/MSD, field duplicate and laboratory duplicate samples. Quality Assurance/Quality Control Plan Tracy Corners Shopping Center 3225 North Tracy Boulevard Tracy,California 95376 Partner Project Number SM14-129814 Docket Number HAS-VCA 14/15-108 August 15,2016 Page 13