Engineering Controls to Protect Collections Inside a Museum During Excavation and In-situ Ozone Treatment of MGP Residuals

摘要

Seldom are engineering controls to mitigate impacts from MGP remediations more stringent to protect objects rather than human health. This paper describes the engineering controls designed to protect collections and artifacts inside a Historic Museum in Santa Barbara, California during the excavation and in-situ ozone treatment of manufactured gas plant (MGP) residuals. The approved remedial action plan calls for excavation of approximately 8,000 cubic yards of soil and in-situ ozone sparging to treat approximately 32,000 cubic yards of soil. The Museum buildings are constructed of adobe bricks (one structure dating back to 1817) and contain collections such as; textiles, paintings, fine art, leather goods and books. A cultural heritage preservation consultant assessed the potential impacts from dust, vibration, ozone and volatile organic compounds generated by the planned remediation. The two major risk factors that could affect Museum collections are: dust and combustion engine exhaust generated during excavation, and ozone and other volatile compounds generated during the in-situ ozone remediation. The engineering controls to mitigate impacts from physical and chemical agents generated during remediation activities include: 1) sealing of doors, windows and roof joints, 2) installing an air intake handling system capable of maintaining a positive air pressure inside the building, 3) installing a “high efficiency” air filtration system in conjunction with the air handlers, 4) excavating source areas of contamination inside a sprung structure equipped with negative air pressure, 5) soil vapor extraction system working in conjunction with in-situ ozone sparging, and 6) installing a state–of–the–art, integrated monitoring system to detect ozone intrusion, change in air pressure, excessive