| A five-year review documenting the progress of Applied Materials Building 1 (AM1) toward remedial goals was completed in 2010. The site has largely achieved remedial goals for groundwater; however, specific National Priorities List (NPL) close-out prospects for sites with rare or intermittent exceedances of groundwater cleanup goals over a limited spatial extent are not clear. Additionally, the presence of groundwater plumes on adjacent properties may complicate the close-out decision. This memorandum reviews historical site data and how they might support the development of a long-term, close-out strategy for the AM1 site. Statistical analyses were performed using modules within the Monitoring and Remediation Optimization System software (MAROS) and ProUCL software. |