200003927 - Laserfiche WebLink

Browse

W 9'00003527 d. Local opposition to the discharge was expressed during a public meeting and the ESD public comment period. The effect of the discharge to the area was reevaluated and the extraction rate was reassessed. It was determined that a phased approach to the remedy under the ROD would be undertaken. This meant that the on -site hotspots of the groundwater contaminant plume would be differentiated from the off -site contaminant plume. The phased approach would allow the reduced flow to be discharged to the drainage canals and would allow for the off - post remedy to be reviewed. 1. During the first phase groundwater will be extracted from the hotspots (total gpm 750) treated and discharged to the two drainage canals, thereby, allowing for greater infiltration on the CHAAP property prior to migration to Silver Creek. First phase groundwater monitoring and modeling will assess the changing contaminant plume off post (shrinking shape and decreasing concentrations). This will allow for the off post remedy to be reevaluated and for an effective and appropriate solution to be put in place. 2. During the second phase of the remedy the off -post remedy will be implemented. If the remedy for the off -post changes significantly (as defined by 40 CFR Section 300.435 (b)(3)(ii) the ROD amendment process will be followed. The ROD amendment process is required when; "...the differences in the remedial or enforcement action, settlement, or consent decree fundamentally alter the basic features of the selected remedy with respect to scope, performance, or cost. To amend the ROD the lead agency, in conjunction with the support agency..." shall; issue a notice of availability and description of the change in a major local newspaper; make the amendment and supporting documentation available for public comment for at least 30 days; hold a public meeting during public comment period; keep a transcript of comments received at both the public meeting and during the public comment period; include response to comments as part of the final ROD amendment; publish a notice of availability of the amended ROD in the local paper; and submit the documents to the administrative record. 3. CHAAP is committed to including the public in the continuing assessment of discharge to Silver Creek. Therefore CHAAP will enter into a Memorandum of Understanding (MOU) with the EPA, NDEQ and CPNRD to formalize its commitment to reassessment of the potential impact of discharge to the on -post Drainage Canals, Silver Creek and the surrounding areas. Hall Co, City of Grand Island, and Merrick County selected the Central Platte Natural Resources District ( CPNRD) as their representative for this issue. III. DEFINITIONS: a. Cornhusker Army Ammunition Plant ( CHAAP) site is, as defined in the FFA, the entire facility and the off -post contamination.