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Vapor Intrusion Assessment Work Plan Project number:60653972 5.6.3 Field Review and Correction After completion of field data and analytical sampling paperwork, substantial efforts are made to ensure that the information recorded is accurate,complete,and legible.Data review and correction protocols have been established for both field-and office-specific data collection and processing.Technical personnel will document and review their own work and are accountable for its correctness. The intent of the review is to ensure that the forms are complete and legible and possess the required data elements. 5.6.4 Sample Shipment Paperwork Specific review considerations will be made for sample shipment paperwork.Before analytical samples are shipped from the field to the laboratory,the completed chain-of-custody paperwork will undergo thorough QC checks.First,a check is performed by field personnel after chain-of-custody forms and labels have been completed. Completion includes completing necessary fields,except the chain-of- custody time relinquished field and having the sampler sign and date the form after completion of the review. The reviewer will ensure that the following is complete: • All forms and sample labels are completed using a blue or black ballpoint pen. If an error is made on any form,the error is struck with a single line,the correct value written as close to the old value as possible, and the correction initialed and dated.The incorrect value will not be written over or obliterated in any way. • If any sample shipment or paperwork errors occur,the errors will be corrected, signed, and dated. In addition to the above reviews,the designated reviewer will also evaluate the following: • Adherence to the project schedule • Correct use of sample numbers, etc. • Correct types and numbers of sample bottles • Specification of preservation where necessary • Dates,times,and initials of corrections • Correct chain-of-custody transfers between field personnel 5.6.5 Error Detection and Correction If any document completion errors are found during the review of project documents by the PM or a designee,a correction process will be undertaken by the individual who discovered the error.If an error is discovered,the incorrect form will be sent to the individual best suited to correct the error. Once the form has been corrected, it will, in effect,become the final version of the document, suitable for report usage. 5.6.6 Data Validation Data validation will be performed on every work order,method,and matrix. This confirmation process will include the review of analytical results, associated laboratory internal QC data and field QC data reported by the analytical laboratory.Data generated will be assessed for PARCC parameters.Any data that do not meet the project limits will be flagged and/or rejected.Any rejected data will go against the project completeness objective.At a minimum,the following items will be reviewed: • Holding times • Accuracy(LCS, calibration,MS, and surrogates) • Precision(duplicates) • Sample integrity Prepared for: California Regional Water Quality Control Board,Central Valley Region AECOM