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ARcosa <br /> 5. The placement of process materials back within the quarry is described in the updated <br /> Exhibit D and Exhibit G. The Technical Revision, provided in Attachment 6, discusses <br /> the chemical testing performed on these materials as well as fate-transport modeling for <br /> the quarry area. Because of the nature of the geology and hydrogeology at the site, the <br /> low potential for contaminant migration through the geology, the chemical composition <br /> and nature of the backfill material, Arcosa believes the potential for contamination from <br /> backfill material is extremely low; therefore, down-gradient groundwater monitoring <br /> wells will not be installed. <br /> DRMS Reference(underline) and Comment(italics) <br /> EXHIBIT L - Reclamation Costs (Rule 6.4.12): All information necessary to calculate the <br /> costs of reclamation must be submitted and broken down into the various major phases of <br /> reclamation. You must provide sufficient information to calculate the cost of reclamation that <br /> would be incurred by the state. <br /> Please resubmit this exhibit - considerably more information and details will be required for <br /> this exhibit to meet the requirements of Exhibit L as listed above. It is sometimes useful to think <br /> of this exhibit as "what information would I need to provide to a third-party to get a complete <br /> bid to conduct all the work required". Costs should be broken down by task and acreage area, <br /> and preferably shown on the reclamation plan map or map dedicated to this exhibit. Details <br /> such as topsoil and overburden volumes, equipment to be used, push distances, specifics for <br /> demolition and disposal costs for removal of the "red-mix" plant area, etc. will need to be <br /> provided. <br /> The issue of groundwater exposure, both currently and as part of the reclamation plan, may <br /> have potentially significant bonding implications that will need to be addressed. DRMS is <br /> currently required to address the liability of exposed groundwater by one of four methods: 1) <br /> bonding to backfill to two feet above static groundwater levels, 2) bonding to line the pit <br /> (generally compacted clay or slurry wall) to SEO standards for a lined reservoir, 3)permittee <br /> demonstration that the permittee has committed, and SEO has accepted, sufficient water rights <br /> to address groundwater exposure until the permanent augmentation plan is approved by Water <br /> Court, 4)permittee demonstration that there is a court approved permanent augmentation plan <br /> for the groundwater exposure on-site. Please clarify how the permittee will address this <br /> requirement. <br /> Arcosa's Response: <br /> The updated Exhibit L is provided in Attachment 8. The updated reclamation costs reflect the <br /> updated reclamation plans and drawings, Exhibits E and F respectively, described above. <br /> The issue of groundwater exposure raised by the Department is addressed by considering the <br /> geology, hydrogeology and water rights for this facility, as described in Exhibits D, E, and G <br /> respectively. Groundwater is greater than 2 feet below the proposed bottom of the quarry, as <br /> discussed in Exhibit E and G. The quarry bottom consists of Pierre Shale material, which has an <br />