CX-019187: Data Acquisition for and Installation of a Permeable Reactive Barrier in P-Area

A subcontractor will design and construct a permeable reactive barrier in the subsurface to intersect volatile organic compound contamination within the P-Area groundwater plumes.  The permeable reactive barrier will extend from approximately 35 feet below land surface to 150 feet below land surface and will be approximately four inches thick.  The reactive material will be zero valent iron.  The length of the permeable reactive barrier will be approximately 150 feet long and will be located in an area just outside of the former P-Reactor fence line on the northeast side of the 105-P building.  Prior to design and installation of the permeable reactive barrier, the subcontractor will be installing eight monitoring wells and four soil borings to collect the necessary data for the design.  The monitoring wells will be used to perform hydraulic pulse interference testing to confirm hydraulic conductivity values.  The hydraulic pulse interference testing are relatively short duration tests that involve the injection of less than 10 gallons of potable water.  The permeable reactive barrier will be injected at 15 conventionally drilled wells along the permeable reactive barrier alignment using an azimuth controlled vertical inclusion technology.