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Site Investigation Work Plan Data Acquisition Carousel Cleaners, Sacramento, California and QA/QC In addition, information recorded in the field notebook should include the following: • a detailed description of sampling locations,physical parameters, and groundwater level measurements; • information on field QC samples (i.e.,duplicates and trip blanks); • observations about the site and samples(e.g., odors, appearance); • information about any activities extraneous to sampling activities that may affect the integrity of the samples(e.g., low-flying aircraft nearby, fossil-fueled motors being used nearby,painting operations being carried out upwind from sampling sites); • equipment used on site, including time and date of calibration(equipment calibration also will be recorded in the calibration logbook); • maps or photographs acquired or taken at the sampling site; and • forms used during sampling. All notebook entries will be made in indelible black or blue ink.No erasures will be permitted. If an incorrect entry is made,the data will be crossed out with a single strike mark and will be dated and initialed by the originator. Entries will be organized into easily understandable tables, if possible. The PM or designee will review field notebooks that result from field operations for completeness and accuracy, on completion of the field work. 5.7 Chain-of-Custody Procedures Proper chain-of-custody and sample tracking methods will be used during sample collection. These methods will include maintaining the documentation necessary to trace sample possession and the proper completion of standardized chain-of-custody forms used to accompany samples shipped to a California- certified laboratory. Field personnel(samplers)will be responsible for performing sample custody, documentation, and tracking tasks when collecting environmental samples meant for laboratory analysis or archiving. Samplers will be responsible for the care and custody of the collected samples and the proper and complete preparation of all sample labels and chain-of-custody forms related to the samples until the samples are transferred or dispatched. During an investigation, custody will be maintained if an environmental sample is: • in one's actual physical possession or view, • in one's physical possession and has not been tampered with(i.e.,under lock or official seal), • retained in a secure area with restricted access, or • placed in a container and secured with an official seal so that the sample cannot be accessed without breaking the seal. A chain-of-custody form will be used as the sample custody and analyses specification document for all samples, from the time of collection to laboratory analysis. 5-6