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Appendix A Quality Assurance/Quality Control Plan other forms, and in photographs. In addition, any deviations from the Workplan will be documented and justified accordingly. The Field Geologist/Scientist/Engineer has the authority to: • Stop any sampling that is not following acceptable protocols. • Discard any sample that is not correctly collected,preserved,or transported. • Invalidate any data obtained from an improperly collected sample or if the proper sample handling and documentation procedures have not been followed. A.2 FIELD QAIQC PROCEDURES Field QA/QC procedures implemented by the Field Geologist/Scientist/Engineer will include documentation of sample collection, sample handling, and field activities as well as the collection of field QC samples. These activities will be recorded on boring log forms, daily field logs, chain-of- custody forms and by photograph. The following field procedures will be implemented during the soil investigation to maintain sample quality control and integrity: • The photoionization detector (PID) will be calibrated daily in accordance with manufacturer specifications and documented on daily calibration logs; • All field procedures will be documented in daily field logs and by photograph; • Soil sample integrity will be maintained by labeling sample containers immediately following sample collection with a waterproof marker; • Sample collection will be documented on a chain-of-custody form. The chain-of- custody form will be filled out by the field sampling team at the time a sample is collected. The chain-of-custody will accompany the sample through all transportation until it is received by the laboratory, where it is filed. Whenever a sample is transferred from one party to another, both parties sign and date the chain-of-custody at the time of transfer; • All samples will be transferred from the field to a laboratory courier following chain- of-custody procedures;and, • Decontamination of drilling and sampling equipment will be conducted using a three-bucket wash system consisting of a detergent wash followed by one rinse with potable water and a final rinse with distilled water and/or using a steam cleaner unit. A.2.1 Calibration Procedures and Frequency All equipment and instruments used in the investigation will be maintained and calibrated to operate within the manufacturer's specifications so that the required sensitivity and QA/QC parameters are upheld. Operational procedures for all field equipment will be followed to ensure that the equipment is operating properly and that data are valid and traceable to a particular instrument. These procedures may include functional operational checks, routine maintenance, instrument TERRA PACIFIC GROUP Page A-2 of A-5