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HomeMy WebLinkAbout1102_BASF_INDUS_RedevelopmentPlanPhase1_DIN26783_20160811 Prepared for Roberts & Stevens, P.A. City Centre Building 301 College Street, Suite 400 Asheville, NC 28801 Project Number 2500.08 Prepared by Altamont Environmental, Inc. 231 Haywood Street Asheville, NC 28801 828.281.3350 Redevelopment Plan—Phase I Closed BASF Landfill Brownfields Project No. 15011-11-11 Sand Hill Road Asheville, North Carolina August 11, 2016 Redevelopment Plan—Phase I August 11, 2016 Closed BASF Landfill Sand Hill Road, Enka, North Carolina Page ii P:\Roberts and Stevens\Enka Partners-BASF\Reports\Redevelopment Plan\Redevelopment Plan.docx Redevelopment Plan—Phase I Closed BASF Landfill Brownfields Project No. 15011-11-11 Sand Hill Road Asheville, North Carolina August 11, 2016 _____________________________________ Adam Tripp, P.G. Redevelopment Plan—Phase I August 11, 2016 Closed BASF Landfill Sand Hill Road, Enka, North Carolina Page iii P:\Roberts and Stevens\Enka Partners-BASF\Reports\Redevelopment Plan\Redevelopment Plan.docx Acknowledgement By signing below, I certify that I have reviewed and agree to abide by this Redevelopment Plan—Phase I. _________________________________________________________________ ______________ Site Owner Representative Date _________________________________________________________________ ______________ Construction Management Supervisor Date _________________________________________________________________ ______________ Site Environmental Professional Date Redevelopment Plan—Phase I August 11, 2016 Closed BASF Landfill Sand Hill Road, Enka, North Carolina Page iv P:\Roberts and Stevens\Enka Partners-BASF\Reports\Redevelopment Plan\Redevelopment Plan.docx Table of Contents 1.0 Introduction and Purpose .................................................................................................. 1  2.0 Site History and Background ............................................................................................. 2  3.0 Redevelopment Plan Strategy and Addendums .............................................................. 3  3.1 Previously Unidentified or Unforeseen Conditions .......................................................... 3  3.2 Reporting ............................................................................................................................ 3  3.2.1 Reporting of Unidentified or Unforeseen Conditions ......................................... 3  3.2.2 Redevelopment Completion Report .................................................................... 3  4.0 Proposed Environmental Management ............................................................................ 4  4.1 Landfill Waste and Impacted Soil Identification and Management ............................... 4  4.1.1 Landfill Waste ....................................................................................................... 4  4.1.2 Impacted Soil ........................................................................................................ 5  4.2 Impacted Groundwater Identification and Management ................................................ 6  4.3 Evaluation of Fill Sources .................................................................................................. 6  4.3.1 Borrow Area .......................................................................................................... 6  4.3.2 Off-Site Fill Sources .............................................................................................. 7  4.4 Construction Phases and Measures ................................................................................ 7  4.4.1 Erosion Control Measures .................................................................................... 7  4.4.2 Vegetation Removal ............................................................................................. 7  4.4.3 Grading and Fill Placement .................................................................................. 8  4.5 Restricted Areas ................................................................................................................ 8  4.6 Assessment and Management of Methane and Landfill Gases .................................... 9  4.7 Operation and Maintenance ............................................................................................. 9  5.0 References ....................................................................................................................... 10  Figures 1. Site Location Map 2. Site Layout Map Table 1. Soil Sample Analytical Results Summary, Borrow Fill Area Evaluation Appendix A. Site Grading Plans Redevelopment Plan—Phase I August 11, 2016 Former BASF Landfill Sand Hill Road, Enka, North Carolina Page 1 P:\Roberts and Stevens\Enka Partners-BASF\Reports\Redevelopment Plan\Redevelopment Plan.docx 1.0 Introduction and Purpose Altamont Environmental, Inc. (Altamont) has prepared this Redevelopment Plan—Phase I (Plan) to provide guidance for initial construction activities (grading, erosion control measures, vegetation removal, etc.) occurring on the Closed Enka BASF Corporation Landfill Site, located on Sand Hill Road in Asheville, North Carolina (Site). Figure 1 shows the Site location and Figure 2 shows the general Site layout. The Plan was prepared on behalf of Enka Partners of Asheville, LLC (Enka Partners), the prospective developer. The Site, managed under a Brownfields Agreement (BFA), is 41.08 acres, and the closed landfill occupies approximately 28 acres of the property, according to state permit No. 11-02. Current redevelopment plans at the Site involve construction of a greenway and a sports complex including ball fields, a concession stand, and associated parking. In order to facilitate the construction schedule, the Redevelopment Plan—Phase I is being presented in at least two phases, consisting of a Site grading phase and a construction phase. Altamont anticipates that Phase II of the Redevelopment Plan will include utility installation, provisions for methane management and monitoring systems (if necessary), and general construction. Please note that a landfill gas assessment is in process as described in Altamont’s Landfill Gas Assessment Plan, dated July 6, 2016. This Phase I of the Redevelopment Plan provides guidance for the grading phase of the project and addresses: • Public safety • Maintenance of the landfill cover, structural integrity, and monitoring systems • Soil and groundwater management • Specifications and precautions for grading, filling, and vegetation removal • Assessment and management of methane and landfill gases (included in a future phase) Redevelopment Plan—Phase I August 11, 2016 Former BASF Landfill Sand Hill Road, Enka, North Carolina Page 2 P:\Roberts and Stevens\Enka Partners-BASF\Reports\Redevelopment Plan\Redevelopment Plan.docx 2.0 Site History and Background The former American Enka Company (American Enka) and BASF Corporation (BASF) manufacturing facility was located adjacent to the Site to the west. American Enka began rayon yarn production at the facility in 1929. BASF purchased American Enka Company in 1985 and operated the facility until 2001, when the property was acquired by Colbond, Inc. The facility primarily manufactured various types of yarns, including continuous filament rayon yarn, nylon textile yarn, and carpet yarn. In 1980, American Enka received a state permit (No. 11-02) to operate a 28-acre industrial waste landfill, which is located on the Site. Various wastes generated from the manufacturing facility on the adjacent property were disposed of in the landfill. The wastes included fly ash (a coal-combustion byproduct), caprolactam (a precursor to nylon) reactor bottoms, waste activated sludge (excess biological material produced during wastewater treatment), alum sludge (material produced from treating wastewater with aluminum sulfate), viscose pit bottoms (a byproduct of the production of viscose rayon), and household and construction wastes. Wastes were deposited from 1929 to 1975 in a 10-acre swale that was located in the northeast corner of the current landfill footprint. That section of the landfill was closed in 1975. The remaining landfill area received waste from 1975 to 2002. The Solid Waste Section (SWS) of the North Carolina Department of Environmental Quality (DEQ), which was then known as the North Carolina Department of Natural Resources (DENR), Division of Waste Management (DWM) issued a letter of closure to BASF (the responsible party) for the landfill on March 13, 2006. BASF is required to meet post-closure conditions for a 30-year period including the following: • Perform semi-annual monitoring of groundwater wells for a minimum of 5 years until re-evaluation by the SWS • Meet the landfill gas standards found in Title 15A, North Carolina Administrative Code (NCAC), Subchapter 13B, Section .0503(2)(a) [NCAC 15A 13B .0503(2)(a)] • Control surface water runoff in accordance with the requirements of NCAC 15A 13B .0503(2)(c) • Maintain the integrity and effectiveness of the final cover system • Submit any proposed post-closure use of the landfill to the DWM; plans for post-closure must avoid possibilities for the entrapment of methane gas An additional condition of closure is that if the property is sold, leased, or transferred the deed must include a statement that the property was used as an unlined landfill for the disposal of industrial waste and, under the North Carolina Solid Waste Management Rules, future use of the property is restricted by the DWM (Altamont 2008). The landfill is unlined, and it is covered by an approximately 2-foot-thick soil cap. Redevelopment Plan—Phase I August 11, 2016 Former BASF Landfill Sand Hill Road, Enka, North Carolina Page 3 P:\Roberts and Stevens\Enka Partners-BASF\Reports\Redevelopment Plan\Redevelopment Plan.docx 3.0 Redevelopment Plan Strategy and Addendums This Plan is designed to be adaptable to multiple scenarios that may be utilized during Site redevelopment. General procedures for evaluating and managing potentially impacted media are provided. However, should redevelopment plans change significantly based on unforeseen conditions or changes to proposed Site structures or uses, an addendum to the Plan must be submitted for approval from the North Carolina Brownfields Program (Brownfields Program) prior to construction. In addition to this Plan, Altamont anticipates preparing and submitting Phase II of the Redevelopment Plan to address portions of Site construction not included in Phase I of the Redevelopment Plan. 3.1 Previously Unidentified or Unforeseen Conditions Previously unidentified or unforeseen conditions (such as the discovery of potentially impacted soil, impacted groundwater, or a potentially regulated substance that has not been identified during previous assessment activities at the Site) may be encountered during redevelopment and operation and maintenance activities. Generally, these discoveries will be made via visual or olfactory indications. If such conditions are discovered, it is the duty of the contractor or contractor’s representative to report these conditions to the Site owner and/or the Site environmental professional immediately. These conditions will be evaluated by the Site environmental professional, and if necessary work will be stopped and appropriate notification made to the Brownfields Program. 3.2 Reporting 3.2.1 Reporting of Unidentified or Unforeseen Conditions If during redevelopment, operation, or maintenance activities impacted media is identified and addressed pursuant to this Plan, a letter report will be prepared and submitted to the Brownfields Program. The report will include a description of procedures and methodology, sampling and disposal documentation, documentation of previously unidentified or unforeseen conditions (if applicable), and figures showing locations where impacted media was identified. Documentation regarding sampling results for fill material brought to the Site will also be included. Procedures for sampling fill material prior to bringing it on-Site are included in Section 4.3. If no impacted media is identified during activities at the Site, then a report will not be submitted. 3.2.2 Redevelopment Completion Report Within 90 days after the conclusion of physical redevelopment, Enka Partners will provide to the DEQ a report on environment-related activities conducted pursuant to the Redevelopment Plan. The report will include a summary and drawings and will describe how the physical redevelopment was accomplished in accordance with the Redevelopment Plan. Redevelopment Plan—Phase I August 11, 2016 Former BASF Landfill Sand Hill Road, Enka, North Carolina Page 4 P:\Roberts and Stevens\Enka Partners-BASF\Reports\Redevelopment Plan\Redevelopment Plan.docx 4.0 Proposed Environmental Management Current redevelopment plans at the Site involve installation of erosion control measures, Site grading, and removal of vegetation prior to construction of a greenway and a sports complex, which will include ball fields, a concession stand, and associated parking. Based on available information, Site workers and contractors will not be required to have 40-hour Hazardous Waste Operations and Emergency Response (HAZWOPER) training. During activities that disturb Site soils, Site workers should be aware of the potential to encounter landfill waste and/or unanticipated impacted soils. Provisions for management of impacted media are presented in the following subsections. Excluding minor trenching for the installation of erosion and sediment control measures, soil excavation of the landfill cover is not currently planned on-Site. A borrow area located to the east of the Site (see Figure 2) will be excavated to provide fill material for the Site. This fill material is not associated with the landfill cover, and it has been sampled and characterized (refer to Section 4.3.1 for a summary of the borrow-area sampling). According to the grading plan (see Appendix A), there will be approximately 300,000 cubic yards (CY) of soil that will be used on-Site for grading purposes and to serve as additional cover over the existing landfill cap. There currently are no plans to remove soil from the Site; however, in the event of any soil requiring off-Site disposal, the material will be characterized and properly disposed of in accordance with applicable regulations, as outlined in Section 4.1.2. 4.1 Landfill Waste and Impacted Soil Identification and Management The nature of construction at the Site provides the potential for encountering or exposing landfill waste or impacted soil. Landfill waste types at the Site are described in Section 2.0. It is anticipated that landfill waste may be exposed during vegetation removal. Provisions for managing landfill waste are described in the following sub-sections. Impacted soil is defined as soil that is not associated with landfill waste that contains concentrations of regulated constituents at concentrations exceeding the Inactive Hazardous Sites Branch (IHSB) preliminary soil remediation goals (SRG) for industrial/commercial soil, with some exceptions. Soil is not considered impacted if it contains concentrations of metals in excess of the SRG that are consistent with naturally occurring concentrations of these metals. In such a scenario, further investigation and/or an evaluation of published data/research will be warranted. Project workers are not expected to encounter impacted soil, but the potential to encounter landfill waste is more significant. 4.1.1 Landfill Waste During construction activities, such as tree removal and installation of erosion control measures that disturb the landfill cover soils, Site workers should be aware of the potential of encountering landfill waste. If field observations indicate the exposure of landfill waste, the owner of the property and/or the Site environmental professional will be notified. The location of this encounter will be noted in the project record. If landfill waste is encountered, the following measures will be implemented: • Immediately stop the activity that exposed the landfill waste • Don applicable personal protective equipment (PPE), such as gloves (nitrile gloves, work gloves, or a combination) • Relocate the exposed landfill waste to where it originated from • Re-establish cover soils over the area of landfill waste exposure Redevelopment Plan—Phase I August 11, 2016 Former BASF Landfill Sand Hill Road, Enka, North Carolina Page 5 P:\Roberts and Stevens\Enka Partners-BASF\Reports\Redevelopment Plan\Redevelopment Plan.docx • Assess work methods in that area to minimize the potential for re-exposure of landfill waste • Ensure a minimum of 2 feet of cover soils exist when work is completed The above methodology is appropriate due to the importation of fill across the majority of the Site. The majority of the Site will receive a minimum of 2 feet of additional cover on top of the existing 2 feet of landfill cover, with some areas receiving as much as 8 feet of additional cover. If exposure of waste occurs in an isolated location in which additional cover soil is not being proposed, existing cover soils will be maintained and confirmed at a depth of 2 feet, minimally. If existing cover is discovered to be less than 2 feet, then additional fill will be applied to this area. These measures should lead to landfill waste having adequate cover prior to the next phase of construction occurring. In the potential scenario that it is not feasible to replace exposed landfill waste at its origin, the waste may need to be collected for off-Site disposal. In this scenario, the owner of the property and/or the Site environmental professional will coordinate the characterization and subsequent disposal of the waste to an off-Site location in accordance with all applicable regulations. 4.1.2 Impacted Soil For the purposes of this Plan, landfill waste (addressed in Section 4.1.1) and soil containing concentrations of metals in excess of the SRG that are consistent with naturally occurring concentrations of these metals are not considered impacted. The project is not expected to encounter impacted soil based on historical reporting. However, if impacted soil or potentially impacted soil is encountered, the following provisions will apply. During construction activities that disturb Site soils, workers should be aware of the potential of encountering impacted soil. If field observations, such as staining, odor, or other observations indicate the presence of impacted soil/media, the owner of the property and/or the Site environmental professional will be notified. These conditions will be evaluated as described in Section 3.1, because these conditions would likely qualify as a previously unidentified condition. Specifically, the Site environmental professional will evaluate the potentially impacted soil through field observations and instrumentation, such as a photoionization detector (PID) or field test kits, and by reviewing historical environmental reports pertaining to the area where the potentially impacted soil was discovered. The results of the field evaluation will determine the laboratory analyses used to characterize the soil. These will consist of one or more of the following analyses in the judgment of the Site environmental professional: • Volatile organic compounds (VOCs) by EPA Method 8260 • Semi-volatile organic compounds (SVOCs) by EPA Method 8270 • Polychlorinated biphenyls (PCBs) by EPA Method 8082 • Resource Conservation and Recovery Act (RCRA) metals plus mercury by various methods • Toxicity characteristic leaching procedure (TCLP) If the presence of impacted soil is in a location receiving additional cover soil, the impacted soil will remain in place and will be capped with a minimum of 2 feet of additional cover soil. If the presence of impacted soil is confirmed in a location that will not receive additional cover soil, the impacted soil will be excavated and disposed of in accordance with applicable local, state, and federal regulations. Excavation of impacted soil will be performed by HAZWOPER-trained contractors. If necessary, procedures for managing fugitive dust will be developed and implemented during activities that disturb soil. If an alternative management or disposal strategy is proposed, a work plan will be submitted to the Brownfields Program for review and approval. Redevelopment Plan—Phase I August 11, 2016 Former BASF Landfill Sand Hill Road, Enka, North Carolina Page 6 P:\Roberts and Stevens\Enka Partners-BASF\Reports\Redevelopment Plan\Redevelopment Plan.docx 4.2 Impacted Groundwater Identification and Management Due to the nature of construction, groundwater is not expected to be encountered during redevelopment activities. With the exception of minor surficial excavation and trenching for the installation of erosion control measures, excavation activities to the extent where encountering groundwater is a possibility are not expected. Groundwater encountered at the Site could potentially be impacted with constituents detected in historical assessment activities, as described in the Brownfields Assessment Report for the former BASF Landfill (Altamont 2016). Impacted groundwater is defined as groundwater containing concentrations of a regulated substance in excess of the Title 15A, NCAC, Subchapter 2L groundwater quality standard (2L standard), with some exceptions. Groundwater containing concentrations of metals in excess of the 2L standard that are consistent with naturally occurring concentrations of these metals is not considered impacted. Although unlikely, should impacted groundwater be encountered during construction activities, it will be containerized, characterized, and disposed of in accordance with federal, state, and local laws. Groundwater will be characterized by laboratory analysis for constituents consistent with those detected in historical assessment activities. 4.3 Evaluation of Fill Sources 4.3.1 Borrow Area Altamont evaluated the suitability of soil from a borrow area located to the east of the Site, shown on Figure 2. Through the methodology described below, the soil was determined to be suitable for use as fill on-Site. Altamont subcontracted Akers Environmental (Akers), a licensed North Carolina driller, to collect soil borings at the borrow area on July 19, 2016. Seven soil borings (see Figure 2) were advanced in the borrow area via direct-push technology and collected using dedicated Macrocore™ sleeves. Soil samples were collected in-situ in order to evaluate the area as a suitable borrow area for use on-Site. Soil borings were each advanced to a depth of either 16 feet below ground surface (ft-bgs), 20 ft-bgs, or 40 ft-bgs, depending on the surface elevation of each boring location. Each boring was advanced in 4-foot intervals. A total of four composite soil samples and one duplicate sample were analyzed for the following parameters: • Eight RCRA Metals by EPA Methods 6010 and 7471 • VOCs by EPA Method 8260 • SVOCs by EPA Method 8270 Samples that were analyzed for VOCs were each collected from a discrete portion of one 4-foot soil boring interval. Samples that were analyzed for RCRA metals and SVOCs were composited from two soil boring locations and included representative soil from the entire soil boring interval from each location, with the exception of SL-4. Soil sample SL-4 was composed of soil from only one boring. A blind duplicate sample (DUP-1) was collected from soil sample SL-2 and analyzed for RCRA metals. The purpose of the duplicate sample was to verify sample collection methods and laboratory analytical practices. Soil samples were placed in laboratory-provided containers, stored on ice, and submitted to Pace Analytical Services (Pace), a North Carolina-certified laboratory. Soil sample analytical results for the borrow area are summarized in Table 1. Analytical results were compared to standards established by the IHSB residential and commercial SRG. Barium, chromium, and lead were detected in all five collected soil samples. Mercury was detected in all collected soil samples with Redevelopment Plan—Phase I August 11, 2016 Former BASF Landfill Sand Hill Road, Enka, North Carolina Page 7 P:\Roberts and Stevens\Enka Partners-BASF\Reports\Redevelopment Plan\Redevelopment Plan.docx the exception of SL-4. All detected constituents were reported at concentrations well below their established residential or commercial SRG. No VOCs or SVOCs were detected in the collected soil samples. Soil borings were screened visually for the presence of potential contamination. The ground surface surrounding each boring was also inspected to attempt to identify any source of potential contamination. Based on observations of the locations of the borings, it appeared that human disturbance was minimal at the borrow area. Some human deposited trash, which consisted of a few glass bottles and plastic containers, was present. Vegetation at the Site consisted of well-established tree growth and medium-dense vegetation growing on the forest floor. 4.3.2 Off-Site Fill Sources If additional fill material is needed from off-Site, representative samples will be collected to verify it is uncontaminated before it is brought to the Site. Specifically, a discrete soil sample will be collected from the fill material and analyzed for VOCs by EPA Method 8260. An additional composite soil sample will be collected from the fill material and analyzed for SVOCs by EPA Method 8270 and RCRA metals by EPA Methods 6010 and 7471. Generally, one soil sample will be collected for every 500 cubic yards of fill material. However, if significant fill material is required, the source area for the fill material will be sampled directly and evaluated through review of historical documents such as historical aerial photos, environmental records, and/or interviews with current and/or past property owners. 4.4 Construction Phases and Measures 4.4.1 Erosion Control Measures Refer to the Site grading plans (see Appendix A) for erosion control measures to be installed and maintained during the project. Erosion control measures will be installed throughout the Site prior to further disturbance or advancement of construction. The installation of erosion control measures presents the opportunity to expose or encounter landfill waste. Typically, silt fence is installed via a mechanical trencher to a depth of 1 ft-bgs, and the supporting stakes are installed to a depth of 1.5 ft-bgs. Installation that follows this methodology should not expect to encounter landfill waste, although the potential exists. If landfill waste is exposed or encountered during the installation of silt fence, the precautions outlined in Section 4.1.1 will be followed. Installation and/or construction of additional erosion control measures, such as diversion swales and stabilized inlets/outlets, also present the opportunity to expose or encounter landfill waste. Although these measures typically do not alter the surface soils significantly, the potential exists. If landfill waste is exposed or encountered during the installation of erosion control measures, precautions outlined in Section 4.1.1 will be followed. If suspected impacted soil is encountered, precautions outlined in section 4.1.2 will be followed. 4.4.2 Vegetation Removal After erosion control measures have been installed, the next step in the grading phase of the project is to remove vegetation, woody debris, and trees from areas of construction. See Figure 2 for the approximate location requiring vegetation removal. The area of vegetation removal will generally be receiving between 4 and 8 feet of additional cover associated with Site grading. Vegetation removal generally will occur in a manner that removes the vegetation flush with the ground surface. If possible, disturbance of the vegetative root mass should be minimal and allowed to remain in place. This practice will help maintain the integrity of landfill cover soils. If large trees are encountered during vegetation removal, the following measures will be taken: Redevelopment Plan—Phase I August 11, 2016 Former BASF Landfill Sand Hill Road, Enka, North Carolina Page 8 P:\Roberts and Stevens\Enka Partners-BASF\Reports\Redevelopment Plan\Redevelopment Plan.docx • Fall the tree, leaving behind a manageable sized stump • If necessary, grind the stump down flush with the ground surface • Limit disturbance to the root mass and leave it in place • Place cover fill over the tree removal location, as required by the Site grading plan To maintain the integrity of the landfill cover, care will be taken to minimize disturbance to the root mass of any tree and leave it in place. However, in some cases, the tree stump will need to be removed. If a tree stump is removed and waste is exposed, the void space left by the tree will be backfilled with clean fill. Prior to backfilling, the root mass will be scraped and agitated with an excavator bucket or similar equipment to remove any potential waste material attached to the roots. If a tree is removed in an area where fill is not proposed to be placed, it may be necessary to add additional cover fill in the area. In all other areas, cover will be placed over the remaining root mass. If a scenario occurs where the root mass is required to be removed, and additional cover soils are not planned for the area, the area will have imported fill placed to ensure a depth of 2 feet remains as landfill cover. If landfill waste is exposed or encountered during the removal of vegetation, precautions outlined in Section 4.1.1. will be followed. If suspected impacted soil is encountered, precautions outlined in Section 4.1.2 will be followed. 4.4.3 Grading and Fill Placement After erosion control measures have been installed and vegetation has been removed, construction personnel will begin grading the Site with fill. Refer to Appendix A for the Site grading plans. Fill used on-Site will be sourced in a manner consistent with options presented in Section 4.3. Precautionary measures to be taken while grading and placing fill include: • Do not penetrate the landfill cover soil cap • Use tracked equipment only in areas where the landfill cover may withstand the pressure from that equipment • Ensure landfill cover remains at a thickness of 2 feet, at a minimum If landfill waste is exposed or encountered during grading and fill placement, precautions outlined in Section 4.1.1 will be followed. If suspected impacted soil is encountered, precautions outlined in section 4.1.2 will be followed. 4.5 Restricted Areas During all construction phases of the project, Site access to the public will be restricted through signage, fencing, and the presence of Site personnel. Due to historical land use or the potential presence of impacted media, several areas of the Site will have access restricted to the public after the project is completed. Details of the historical land use and contaminants present can be found in the Brownfields Assessment Report for the former BASF Landfill (Altamont 2016). Areas that will be restricted to the public following the completion of development are shown on Figure 2 and include: • Basin 3 • B-SW-5 location • Area around Seep 1 • Area of additional fill The areas will be restricted from the public through the use of security fencing, appropriate signage, or the placement of at least 2 feet of clean fill. Redevelopment Plan—Phase I August 11, 2016 Former BASF Landfill Sand Hill Road, Enka, North Carolina Page 9 P:\Roberts and Stevens\Enka Partners-BASF\Reports\Redevelopment Plan\Redevelopment Plan.docx 4.6 Assessment and Management of Methane and Landfill Gases Landfill gases (LFG), including methane, are currently being assessed. Details of the landfill gas assessment are provided in the Landfill Gas Assessment Plan for the former BASF Landfill (Altamont 2016). Management of LFG is not expected to be required during the grading phase of the project. Management of LFG will be detailed in the Redevelopment Plan for the construction phase of the project (Phase II), which will be issued as a separate document from this Plan. 4.7 Operation and Maintenance In general, operation and maintenance activities at the Site should not require specialized training by employees or contractors outside of the procedures detailed in this Plan. However, if contractors observe potentially impacted media during these activities, the provisions of Section 4.1.2 would apply. Operation and maintenance activities will be addressed in the Redevelopment Plan for the construction phase (Phase II) of the project. Redevelopment Plan—Phase I August 11, 2016 Former BASF Landfill Sand Hill Road, Enka, North Carolina Page 10 P:\Roberts and Stevens\Enka Partners-BASF\Reports\Redevelopment Plan\Redevelopment Plan.docx 5.0 References Altamont Environmental, Inc. 2016. Brownfields Assessment Report—Draft. July 27. Altamont Environmental, Inc. 2016. Landfill Gas Assessment Plan. July 6. FIGURES Copyright:© 2013 National Geographic Society, i-cubed   0 1,000 2,000Feet       ¦             !> !>!> !>!> !>!> !> !>!>            NC 911 Board, NCCGIA, NCDOT         0 200100Feet ¦ 2 Notes:Map feature locations are approximate.Sports complex detail provided by WGLA Engineering, PLLC Data Sources:Basemap - NC OneMap 2015Property - Buncombe County GISWaste Boundary - WGLA Engineering, PLLC P:\Roberts and Stevens\Enka Partners-BASF\Figures\Redevelopment Plan\MXDs\Site Layout.mxd Scale Legend Site Boundary Waste Boundary Sports Complex !>Sample Location TABLE Ta b l e 1 So i l S a m p l e A n a l y t i c a l R e s u l t s S u m m a r y Bo r r o w A r e a E v a l u a t i o n As h e v i l l e , N o r t h C a r o l i n a VO C s (m g / k g ) SV O C s (m g / k g ) A r s e n i c B a r i u m C a d m i u m C h r o m i u m L e a d M e r c u r y S e l e n i u m S i l v e r V o l a t i l e O r g a n i c C o m p o u n d s S e m i - V o l a t i l e O r g a n i c C o m p o u n d s SL - 1 7 / 1 9 / 2 0 1 6 < 3 . 7 17 8 <0 . 3 7 20 . 7 6 . 4 0 . 0 1 0 <3 . 7 < 1 . 9 N D N D SL - 2 7 / 1 9 / 2 0 1 6 < 4 . 1 39 7 <0 . 4 1 48 . 1 1 3 . 2 0 . 0 1 4 <4 . 1 < 2 . 0 N D N D SL - 3 7 / 1 9 / 2 0 1 6 < 7 . 8 18 8 <0 . 7 8 80 . 3 1 4 . 0 0 . 0 1 1 <7 . 8 < 3 . 9 N D N D SL - 4 7 / 1 9 / 2 0 1 6 < 7 . 3 37 2 <0 . 7 3 55 . 8 1 0 <0 . 0 0 2 8 < 7 . 3 < 3 . 6 N D N D DU P - 1 7 / 1 9 / 2 0 1 6 < 3 . 9 38 7 <0 . 3 9 43 . 5 1 3 . 7 0 . 0 1 5 <3 . 9 < 2 . 0 N D N D 0. 6 8 3 , 0 0 0 1 4 . 2 2 4 , 0 0 0 4 0 0 2 . 2 0 7 8 . 0 7 8 0 N L N L 3 4 4 , 0 0 0 1 9 6 1 0 0 , 0 0 0 * 8 0 0 3 . 1 3 1 , 1 6 0 1 , 2 0 0 N L N L 7. 4 4 2 0 N L 5 2 1 7 0 . 1 2 0 . 4 5 N E N L N L No t e s : mg / k g Al l c o n c e n t r a t i o n s a r e s h o w n i n m i l l i g r a m s p e r k i l o g r a m VO C s Vo l a t i l e o r g a n i c c o m p o u n d s IH S B S R G s - I n d u s t r i a l / C o m m e r c i a l N o r t h C a r o l i n a D e p a r t m e n t o f E n v i r o n m e n t a l Q u a l i t y ( D E Q ) , D i v i s i o n o f W a s t e M a n a g e m e n t ( D W M ) , I n a c t i v e H a z a r d o u s S i t e s B r a n c h ( I H S B ) P r e l i m i n a r y S o i l R e m e d i a t i o n G o a l s ( S R G s ) f o r I n d u s t r i a l / C o m m e r c i a l S o i l , A p r i l 2 0 1 6 IH S B S R G s - R e s i d e n t i a l D E Q - D W M - I H S B S R G s f o r R e s i d e n t i a l S o i l , A p r i l 2 0 1 6 Ba c k g r o u n d M e t a l s C o n c e n t r a t i o n E s t i m a t e d a r i t h m e t i c m e a n c o n c e n t r a t i o n o f m e t a l s i n s o i l i n t h e e a s t e r n U n i t e d S t a t e s f r o m : E l e m e n t C o n c e n t r a t i o n s i n S o i l s a n d O t h e r S u r f i c i a l M a t e r i a l s o f t h e C o n t e r m i n o u s U n i t e d S t a t e s , U S G e o l o g i c a l S u r v e y P r o f e s s i o n a l P a p e r 1 2 7 0 . 1 9 8 4 15 , 3 0 0 In d i c a t e s t h e c o n c e n t r a t i o n d e t e c t e d w a s a b o v e t h e l a b o r a t o r y r e p o r t i n g l i m i t <5 . 5 I n d i c a t e s t h e c o n s t i t u e n t w a s n o t d e t e c t e d a b o v e t h e l a b o r a t o r y r e p o r t i n g l i m i t * IH S B P S R G f o r c h r o m i u m i s f o r c h r o m i u m ( I I I ) , I n s o l u b l e S a l t s . DU P - 1 DU P - 2 c o l l e c t e d c o n c u r r e n t l y w i t h S L - 2 NA No t A n a l y z e d ND N o t D e t e c t e d NL N o n e L i s t e d NE N o t E s t a b l i s h e d RC R A M e t a l s Ba c k g r o u n d M e t a l s C o n c e n t r a t i o n IH S B S R G s - I n d u s t r i a l / C o m m e r c i a l Sa m p l e I D Da t e C o l l e c t e d IH S B S R G s - R e s i d e n t i a l P:\ R o b e r t s a n d S t e v e n s \ E n k a P a r t n e r s - B A S F \ R e p o r t s \ R e d e v e l o p m e n t P l a n \ F i l l M a t e r i a l S a m p l i n g \ T a b l e 1 - S o i l S a m p l i n g Page 1 of 2 APPENDIX APPENDIX A Site Grading Plan