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Vapor Intrusion Assessment Work Plan Project number:60653972 5.3.5 Laboratory Control Samples An LCS analysis will be performed by the laboratory daily or per analytical batch,whichever is more frequent.An LCS is a blank reagent spike containing analytes at a specified concentration,usually in the mid-calibration range. The LCS undergoes the entire sample preparation and analysis process to demonstrate that the method/instrument is stable and operating within acceptable accuracy limits. 5.3.6 Surrogate Spikes Surrogate spike analyses are used to determine the efficiency of analyte recovery in organic sample preparation and analyses. Surrogate standards are added to organic standards, samples,and blanks and must go through the full preparation process. Surrogate spike recoveries must fall within the limits established by the project to ensure efficiency of the method analysis. 5.3.7 Laboratory Failures Laboratory failures include equipment malfunction,failure of internal QA/QC checks, failure of performance of system audits, and non-compliance with QA requirements. The failure event is documented by the laboratory on a non-conformance/corrective action form and submitted to the laboratory QA officer for review and resolution.Non-conformance reports and other QC anomalies will be submitted on the case narrative with the final data package from the laboratory.The project or program chemist will be informed of failures that affect project samples. 5.3.8 Sample Preservation Sample preservation is instrumental in maintaining integrity of the samples from the time of collection until the analyses are performed. Therefore,the samples will be preserved during collection and storage to prevent or retard degradation or modification of the chemicals in the samples. See Table 4. 5.4 Sample Collection and Quality Control The quality of data collected in an environmental study is critically dependent upon the quality and thoroughness of field sampling activities. Considering the sensitivity of analytical methods and the levels of detection specified for contaminant analyses,the sampling process becomes integral to the quality of data generated.As a result, general field operations and practices and specific sample collection and inventory will be carefully implemented and documented. Section 4 of this Work Plan describes the sampling program. 5.4.1 Sample Containers,Volumes, and Preservation Table 4 summarizes the sample container,preservation method, and holding time requirements for analytical samples,respectively. 5.4.2 Field Data and Sample Documentation Procedures Field personnel are responsible for the use and maintenance of field notebooks when conducting project- related field work.Field notebooks provide a means for recording data collection activities performed at a Site.Field notebooks are intended to provide sufficient data and observation notes to enable participants to reconstruct events that occur during site activities.Entries should be as factual, detailed, and descriptive as possible so that a particular situation can be reconstructed without reliance on the collector's memory. Field notebooks are not to be used as a sole source of project or sampling information,nor should they be used for recording opinions or any other inappropriate terminology.Field notebooks will be completed with consecutively numbered pages.Notebooks will be permanently assigned to field personnel. The cover of each notebook will include the following information: Prepared for: California Regional Water Quality Control Board,Central Valley Region AECOM