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Site Investigation Work Plan Data Acquisition Carousel Cleaners, Sacramento, California and QA/QC 5.6 Sample Collection and Quality Control The quality of data collected in an environmental study is critically dependent on 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. Thus,general field operations,practices, specific sample collection, and inventory will be carefully implemented and documented. Section 4 of this Work Plan describes the sampling program. 5.6.1 Sampling Design SG samples will be collected and analyzed for project-specific VOCs by USEPA Method TO-15 or TO- 15 SIM. The IA/CS samples will be analyzed by USEPA Method TO-15 SIM, and the downhole SG samples will be collected after the wells have been installed and equilibrated for a minimum of 48 hours. 5.6.2 Sample Containers, Volumes, and Preservation Tables 4 and 5 summarize the sample container,preservation method, and holding time requirements for analytical and IDW samples,respectively. 5.6.3 Field Data and Sample Documentation Procedures Field personnel will be responsible for the use and maintenance of field notebooks when conducting project-related field work. Field notebooks provide a means for recording all data collection activities performed at a project site. Field notebooks are intended to provide sufficient data and observation notes to enable participants to reconstruct events that occur during site activities. All entries need to 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: • person or organization to whom the book is assigned, • book number, • project number(if different from site number), • site name and number, and • start date of notebook entries. Entries into the notebook may contain a variety of information.At a minimum, notebook entries must include the following information at the beginning of each day: • date, • start time, • weather conditions, • county, state,and site address, • all field personnel present and directly involved, and • level of personal protection being used on site. 5-5