BoRit Superfund Site Timeline Removal Action Preliminary Assessment/Site Inspection National Priorities Listing (NPL) Process Remedial Investigation (RI) Feasibility Study (FS) A “removal action” is an action intended to stabilize or clean up an incident or site which poses an immediate threat to human health or the environment. If the release of hazardous substances requires immediate or short-term response actions, these are addressed under the Emergency Response program of Superfund. A Preliminary Assessment (PA) is designed to determine whether a sites poses little or no threat to human health and the environment or if it does pose a threat, whether the threat requires further investigation. A Site Inspection (SI) identifies sites that enter the NPL listing process and provides the data needed for Hazard Ranking System (HRS) Scoring and documentation. A list of the most serious sites identified for possible long-term cleanup. After a site is listed on the NPL, a Remedial Investigation/Feasibility Study (RI/FS) is performed at the site. The RI serves as the mechanism for collecting data to: characterize site conditions; determine the nature of the waste; and assess risk to human health and the environment. The Feasibility Study (FS) is the mechanism for the development, screening, and detailed evaluation of alternative remedial actions. The RI/FS is a multi-step process including: Scoping Site Characterization Development and Screening of Alternatives EPA Process Phase I: July 2008-June 2009 – Stabilization of stream banks so that asbestos-containing material (ACM) does not enter the streams is begun. In June 2009, EPA completed stream bank stabilization at Wissahickon Creek. Phase II: July 2009-May 2010 - Stream bank stabilization was completed at Rose Valley Creek. Phase III: May 2010-June 2010 – Stabilization completed on the reservoir berm parallel to the Wissahickon Creek. Phase IV: June 2010-July 2011 - Pile clearing and stabilization of Tannery Run completed. Phase V: July 2011-September 2011 – Stabilization completed at Wissahickon Creek from the dam to its confluence with Tannery Run. In April 2006, an EPA Site Assessment Team conducted a baseline sampling event at the BoRit Asbestos Site. Results from the sampling event showed the presence of asbestos in the air, soil, surface water and sediments. Proposed to the NPL September 2008. In April 2009, the site was listed on the NPL, making the site eligible for federal cleanup funding. Work began November 2009. Phase I of field work, which included surface water, sediment, soil, and waste sampling, completed January 2010. Phase II activities, which included community air monitoring, installation of groundwater monitoring wells, and additional onsite and offsite (including residential) soil sampling, began October 2010 and completed November 2010. Activity based sampling occurred in summer/fall 2011. EPA expects to complete the RI/FS in approximately 3 years, depending on the needs of the investigation. BoRit Process Please Note: Time frames for site activities can vary depending on influences such as schedules, contracts and weather. Draft updated March 12, 2012

BoRit Superfund Site Timeline Record of Decision (ROD) Remedial Design (RD) Remedial Action (RA) Post-Construction Completion NPL Deletion Reuse A ROD contains site history, site description, site characteristics, community participation, enforcement activities, past and present activities, contaminated media, the contaminants present, scope and role of response action and the remedy selected for cleanup. Preparation and implementation of plans and specifications for applying site remedies. All new fund-financed remedies are reviewed by the National Priorities Panel. Remedial Action (RA) follows the remedial design phase and involves the actual construction or implementation phase of Superfund site cleanup. The bulk of the cleanup usually occurs during this phase. Ensures that Superfund response actions provide for the long-term protection of human health and the environment. Included here are: Long-Term Response Actions Operation and Maintenance Institutional Controls Five-Year Reviews Remedy Optimization Removes a site from the NPL once all response actions are complete and all cleanup goals have been achieved. EPA’s goal is to make sure that at every cleanup site, the Agency and its partners have an effective process and the necessary tools and information needed to fully explore future uses, before the cleanup remedy is implemented. This gives the Agency the best chance of making it’s remedies consistent with the likely future use of the site. In turn, EPA gives communities the best opportunity to use sites following cleanup. EPA Process It is important to note that EPA has NOT chosen a long-term cleanup option for the site. EPA plans to work with the community to keep them informed of our progress and of the options we’re considering for the final cleanup. Once the RI/FS is completed, EPA will propose a final cleanup option and will offer the community a sixty day period to comment on the proposed plan. Notes Notes Notes Notes Notes BoRit Process Please Note: Time frames for site activities can vary depending on influences such as schedules, contracts and weather. Draft updated March 12, 2012