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AdvancedGeo Environmental 10 April 2017 AGE-NC Project No. 12-2169 Page 5 of 6 Prior to sample collection, each soil-vapor well will be purged a total of three purge volumes. The purge volume will be determined by calculating the sum of the internal volume of the Teflon tubing, the soil vapor point and the volume of the boring trace. Leak tests will be performed on each soil-vapor sampling assembly by attaching and securing the sample and purge canisters to the manifold and opening the valve on the purge canister and the manifold. The leak test will be performed for approximately 10 minutes on each assembly. Upon achieving a successful leak test, the purge canister valve will be opened for a calculated period of time to allow for three calculated volumes of air to be purged. The purge canister vacuum gauge will be monitored to ensure a proper decrease of vacuum ensuring flow and purging. Upon achieving the targeted purge volume, the purge canister valve will be closed and the sample canister valve will be opened. The initial pressure and time will be recorded. Upon reaching at least -5 in Hg or less, the sample canister valve will be closed and final pressure and time recorded. The sampling port on the sampling canister will be capped with a brass end-cap. All soil-vapor samples will be labeled with sample ID, project name, date, time, and samplers' initials. The samples will be logged on a chain-of-custody form, and placed into dry containers. Subsequently, all collected soil-vapor samples will be delivered to a California Department of Public Health (CDPH)-certified analytical laboratory, for analysis of the following constituents: TPH-g by Method TO-15; Volatile organic compounds (VOC) naphthalene full scan by Method TO-15; Oxygen in accordance with Modified ASTM D-1946; and IPA (tracer) in accordance with EPA Method 8260. 3.2. EQUIPMENT DECONTAMINATION/WASTE MANAGEMENT Prior to use, all sampling tools used for sample collection will be thoroughly rinsed with clean water after being washed with a solution of Alconox. Any soil waste generated during field activities will be containerized in properly labeled DOT-approved 55-gallon drums, and stored on-site in an area lacking general public access. Soil disposal alternatives will be evaluated, based on previous site soil data. 3.3. REPORTING Reporting of the site assessment and soil-vapor investigation will be included in a combined report. The report will include a description of work performed and the results