RIVERBEND STEAM STATION ASH BASIN Drinking Water Supply Well and Receptor Survey NPDES Permit NC0004961

September 30, 2014

Duke Energy Carolinas, LLC | Riverbend Steam Station Ash Basin Drinking Water Supply Well and Receptor Survey

TABLE OF CONTENTS

Table of Contents Page

Report Verification ...... i Table of Contents ...... ii Section 1 - Introduction ...... 1 Section 2 - Background ...... 3 2.1 Plant and Ash Basin Description ...... 3 2.2 Description of Surrounding Properties ...... 4 Section 3 – Drinking Water Supply Well and Receptor Survey Activities and Findings ...... 5 3.1 NCDENR Records Review ...... 5 3.2 Local/Regional Water Agency Records Review ...... 5 3.3 Mecklenburg County Records Review ...... 6 3.4 Gaston County Records Review ...... 6 3.5 Utility Department Records Review ...... 6 3.6 HDR Field Survey ...... 7 3.7 Additional Survey Activities ...... 8 3.8 USGS Hydrography Review ...... 8 Section 4 - Site Geology and Hydrogeology ...... 9 4.1 Generalized Site Hydrogeologic Conceptual Model ...... 9 4.2 Site Geology and Hydrogeology ...... 10 4.3 Groundwater Flow Directions ...... 11 Section 5 - Summary of Findings ...... 14 Section 6 - References ...... 15

Figures Figure 1 Site Location Map Figure 2 Site Layout Figure 3 Drinking Water Supply Well and Receptor Survey Map

Tables Table 1 Water Supply Well Information

Appendices Appendix A EDR GeoCheck Report

ii Carolinas, LLC | Riverbend Steam Station Ash Basin Drinking Water Supply Well and Receptor Survey

SECTION 1 - INTRODUCTION

Section 1 - Introduction Duke Energy Carolinas, LLC (Duke Energy), owns and formerly operated the Riverbend Steam Station (RBSS), located near Mt. Holly, in Gaston County, (see Figure 1). The steam station generated electricity by burning coal. Coal ash residue from RBSS’s coal combustion process was disposed in the station’s ash basin located adjacent to the station and Mountain Island Lake. The discharge from the ash basin is permitted by the North Carolina Department of Environment and Natural Resources (NCDENR) Division of Water Resources (DWR) under the National Pollutant Discharge Elimination System (NPDES) Permit NC0004961.

The Coal Ash Management Act 2014 – General Assembly of North Carolina Senate Bill 729 Ratified Bill (Session 2013) (SB 729) revised North Carolina General Statute 130A-309.209(c) to require:

No later than October 1, 2014, the owner of a coal residuals surface impoundment shall conduct a Drinking Water Supply Well Survey that identifies all drinking water supply wells within one-half mile down-gradient from the established compliance boundary of the impoundment and submit the Survey to the Department.

On August 13, 2014, Duke Energy received a Notice of Regulatory Requirements (NORR) for the 14 Coal Ash Facilities owned by Duke Energy in North Carolina. The NORR states:

No later than October 14th, 2014 as authorized pursuant to 15A NCAC 02L .0106(g), the DWR is requesting that Duke perform a receptor survey at each of the subject facilities and submitted to the DWR. The receptor survey is required by 15A NCAC 02L .0106(g) and shall include identification of all receptors within a radius of 2,640 feet (one-half mile) from the established compliance boundary identified in the respective National Pollutant Discharge Elimination System (NPDES) permits. Receptors shall include, but shall not be limited to, public and private water supply wells (including irrigation wells and unused or abandoned wells) and surface water features within one-half mile of the facility compliance boundary. For those facilities for which Duke has already submitted a receptor survey, please update your submittals to ensure they meet the requirements stated in this letter and referenced attachments and submit them with the others. If they do not meet these requirements, you must modify and resubmit the plans.

The results of the receptor survey shall be presented on a sufficiently scaled map. The map shall show the coal ash facility location, the facility property boundary, the waste and compliance boundaries, and all monitoring wells listed in the respective NPDES permits. Any identified water supply wells shall be located on the map and shall have the well owner's name and location address listed on a separate table that can be matched to its location on the map.

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SECTION 1 - INTRODUCTION

HDR has completed this Drinking Water Supply Well and Receptor Survey (Survey) to satisfy the requirements outlined in SB 729 and the NORR. The scope of this Survey includes identification of all receptors within a 0.5-mile radius (2,640 feet) of the RBSS ash basin compliance boundary based on the requirements set forth in 15A NCAC 02L .0106(g). The receptors include public and private water supply wells (including irrigation wells and unused or abandoned wells) and surface water features within a 0.5-mile radius of the RBSS ash basin compliance boundary. HDR also identified public water supplies and wellhead protection areas (if present) within a 0.5-mile radius of the RBSS ash basin compliance boundary. The compliance boundary for groundwater quality in relation to the ash basin is defined in accordance with 15A NCAC 02L .0107(a) as being established at either 500 feet from the waste boundary or at the property boundary, whichever is closer to the source. The Survey activities performed and the findings of those activities are presented in Section 3 and on Figure 3. Table 1 includes the well owner’s name and location address with an identifier which corresponds to the water supply well identifier on Figure 3. A potential area of interest with respect to the RBSS ash basin groundwater flow has been delineated on Figure 3. This area is considered to be potentially downgradient of the RBSS ash basin, based on available information.

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SECTION 2 - BACKGROUND

Section 2 - Background

2.1 Plant and Ash Basin Description RBSS is a former coal-fired electricity generating facility which had a capacity of 454 megawatts located in Gaston County, North Carolina, near the town of Mt. Holly. As of April 1, 2013, all of the coal-fired units have been retired. The site is located between the south bank of the on Mountain Island Lake and the north side of Horseshoe Bend Beach Road. The surrounding area generally consists of residential properties, undeveloped land, and Mountain Island Lake. Horseshoe Bend Beach Road runs generally west to east and is located along a local topographic divide. The topography at the site generally slopes downward from that divide to Mountain Island Lake.

The seven-unit station began commercial operation in 1929 with two units and then expanded to seven by 1954. During its final years of operation, RBSS was considered a cycling station and was brought online to supplement energy supply when electricity demand was at its highest.

The ash basin system consists of a Primary Cell and a Secondary Cell, separated by an intermediate dike. The ash basin at RBSS originally consisted of a single-cell basin commissioned in 1957 and was expanded in 1979. The single basin was divided by constructing a divider dike to form two separate cells in 1986.

The ash basin is located approximately 2,400 feet to the northeast of the power plant, adjacent to Mountain Island Lake, as shown on Figure 2. The Primary Cell is impounded by an earthen embankment dike, referred to as Dam #1 (Primary), located on the west side of the Primary Cell. The Secondary Cell is impounded by an earthen embankment dike, referred to as Dam #2 (Secondary), located along the northeast side of the Secondary Cell. The toe areas for both dikes are in close proximity to Mountain Island Lake.

The surface area of the Primary Cell is approximately 41 acres with an approximate maximum pond elevation of 724 feet. The surface area of the Secondary Cell is approximately 28 acres with an approximate maximum pond elevation of 714 feet. The full pond elevation of Mountain Island Lake is approximately 646.8 feet.

The ash basin system was an integral part of the station’s wastewater treatment system which predominantly received inflows from the ash removal system, station yard drain sump, and stormwater flows. During station operations, inflows to the ash basin were highly variable due to the cyclical nature of station operations. The inflows from the ash removal system and the station yard drain sump were discharged through sluice lines into the Primary Cell. The discharge from the Primary Cell to the Secondary Cell is through a concrete discharge tower located near the divider dike.

Although the station is retired, wastewater effluent from other non-ash-related station discharges to the ash basin is discharged from the Secondary Cell, through a concrete discharge tower, to Mountain Island Lake. The concrete discharge tower drains through a 30-

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SECTION 2 - BACKGROUND

inch-diameter corrugated metal pipe (CMP) into a concrete-lined channel that discharges to Mountain Island Lake. The ash basin pond elevation is controlled by the use of concrete stop logs. 2.2 Description of Surrounding Properties Properties located within a 0.5-mile radius of the RBSS ash basin compliance boundary and north of Mountain Island Lake are located in Huntersville, Mecklenburg County, North Carolina. These properties are primarily comprised of a wildlife refuge and a nature preserve. One residential property is located northeast of the ash basin compliance boundary within the 0.5-mile radius.

Properties located within the 0.5-mile radius of the RBSS ash basin compliance boundary and south of Mountain Island Lake are located in Mount Holly, Gaston County, North Carolina. The majority of the property in this area is owned by Duke Energy and associated with the RBSS. Residential properties are located south and southeast of the ash basin compliance boundary to the south of Horseshoe Bend Beach Road within the 0.5-mile radius.

Figure 3 depicts these properties surrounding RBSS.

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SECTION 3 – DRINKING WATER SUPPLY WELL AND RECEPTOR SURVEY ACTIVITIES AND FINDINGS

Section 3 – Drinking Water Supply Well and Receptor Survey Activities and Findings

3.1 NCDENR Records Review On July 10, 2014, Mr. Justin Schumacher with HDR contacted by telephone Mr. Sean McGuire, Geographic Information System (GIS) Specialist with the NCDENR Department of Environmental Health (DEH) Public Water Supply Section (PWSS). Mr. McGuire stated that the Public Water Supply Water Sources GIS point data set was in the process of being updated. The most current GIS data set of public water supply locations available from North Carolina state agencies was provided by Mr. McGuire via electronic mail on July 14, 2014. The GIS point data for the public water supply wells includes, but is not limited to, information such as public water supply (PWS) system identification numbers, ownership information, PWS source type, well depth, and well yield. HDR reviewed the GIS data set to identify public water supply sources within a 0.5-mile radius of the RBSS ash basin compliance boundary.

On August 8, 2014, HDR reviewed the NCDENR Division of Water Resources (DWR) Source Water Assessment Program (SWAP) online database for public water supply sources to identify any wells located within a 0.5-mile radius of the ash basin compliance boundary, confirm the location of wells included in the Public Water Supply Water Sources GIS point data set, and identify any wellhead protection areas located within a 0.5-mile radius of the compliance boundary. The NCDENR SWAP database provides detailed assessments of all public drinking water intakes and wellhead protection areas in North Carolina. The website address is: http://swap.ncwater.org/website/swap/viewer.htm.

No public water supply wells were identified in the Public Water Supply Water Sources GIS point data set or on the NCDENR SWAP online database within a 0.5-mile radius of the RBSS ash basin compliance boundary.

No wellhead protection areas were identified on the NCDENR SWAP online database within a 0.5-mile radius of the RBSS ash basin compliance boundary. 3.2 Local/Regional Water Agency Records Review HDR contacted EDR to conduct a local/regional water agency records review for water supply wells within a 1-mile radius of the RBSS ash basin. A copy of the EDR Geocheck Report (Inquiry Number 4073890.1s) dated September 22, 2014, is provided in Appendix A.

The EDR report identified two wells within the 0.5-mile radius of the RBSS ash basin compliance boundary that are listed on the Federal United States Geological Survey (USGS) database. The two wells queried on the USGS National Water Information System: Web Interface (http://waterdata.usgs.gov/nc/nwis/inventory). Based on the latitude and longitude provided for the two wells in the database, they were determined to be located on the RBSS

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SECTION 3 – DRINKING WATER SUPPLY WELL AND RECEPTOR SURVEY ACTIVITIES AND FINDINGS

property. Duke Energy personnel indicated that water supply wells were never present onsite in the locations provided in the USGS database.

The EDR report identified one well within the 0.5-mile radius of the RBSS ash basin compliance boundary that is listed on the Federal Data Reporting System (FRDS) Public Water Supply System database. Public Water Supply well PWS: NC01367706 was confirmed by Duke Energy personnel to be located on the RBSS property. Duke Energy personnel stated that the latitude and longitude coordinates provided in the database for this well were not accurate. The location of the well included on Figure 3 is based on a discussion with Donna Burrell with Duke Energy regarding the location of this well. According to Duke Energy personnel, this well is no longer used as a drinking water supply well for the station as it was prior to March 2001 when the station was reportedly connected to the Mount Holly Public Utilities Department. Available information pertaining to this well is included on Table 1. 3.3 Mecklenburg County Records Review On August 14, 2014, HDR reviewed Mecklenburg County’s Groundwater and Wastewater Services Well Information System online database to identify any private or public water supply wells located in Mecklenburg County within a 0.5-mile radius of the ash basin compliance boundary. Established in 2002, the database provides Mecklenburg County’s collection of data about well and septic system permitting, subsurface investigation permitting, monitoring well registration and abandonment, and Mecklenburg County Priority List contamination sites. The website address is: http://meckmap.mecklenburgcountync.gov/WIS_3/index.html.

No private or public water supply wells were identified on the Mecklenburg County Groundwater and Wastewater Services Well Information System online database located within a 0.5-mile radius of the ash basin compliance boundary. 3.4 Gaston County Records Review HDR contacted the Gaston County Environmental Health Department to inquire about the location and details (if available) for registered water supply wells located in Gaston County within a 0.5-mile radius of the ash basin compliance boundary. On August 14, 2014, Mr. Justin Schumacher with HDR contacted Ms. Samantha Dye, Assistant Administrator with the Gaston County Environmental Health Department. Ms. Dye informed Mr. Schumacher that she researched Gaston County’s records which date back to 1989 for private and/or public water supply wells within a 0.5-mile radius of the ash basin compliance boundary.

The Gaston County Environmental Health Department has no records of private or public water supply wells located within a 0.5-mile radius of the ash basin compliance boundary. 3.5 Utility Department Records Review HDR contacted Charlotte-Mecklenburg Utilities Department (CMUD) to inquire about municipal water supply to properties located in Mecklenburg County within a 0.5-mile radius of the ash basin compliance boundary. Prior to contacting CMUD, HDR personnel reviewed orthophotography obtained from NC OneMap GeoSpatial portal (dated 2010) and identified one

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SECTION 3 – DRINKING WATER SUPPLY WELL AND RECEPTOR SURVEY ACTIVITIES AND FINDINGS

residential property located in Mecklenburg County within a 0.5-mile radius of the ash basin compliance boundary northeast of RBSS. On August 14, 2014, Mr. Justin Schumacher contacted Mecklenburg County “Citizen Service/311” to inquire about municipal water supply to the identified residence. CMUD does not have record of the residential property being connected to the municipal water and sewer system.

Based on CMUD not providing water service to the residence identified and no record of a private water supply well identified on the Mecklenburg County Groundwater and Wastewater Services Well Information System online database, it is assumed that the residence is serviced by an unregistered private water supply well (well 3). The approximate location of the assumed private water supply well is shown on Figure 3. Available information for the property on which the assumed well is located is provided in Table 1.

HDR contacted the Mount Holly Public Utilities Department to inquire about municipal water supply to properties located in Mount Holly and Gaston County within a 0.5-mile radius of the ash basin compliance boundary. On August 14, 2014, Mr. Schumacher spoke with Mr. Don Petty with the Mount Holly Public Utilities Department billing department.

Mr. Petty confirmed that the Mount Holly Public Utilities Department provides municipal water service to the RBSS site and the properties located in Gaston County within a 0.5-mile radius of the ash basin compliance boundary. 3.6 HDR Field Survey HDR personnel performed a field reconnaissance on January 27, 2014, to identify public and private water supply wells (including irrigation wells and unused or abandoned wells) and surface water features located within a 0.5-mile radius of the RBSS ash basin compliance boundary. A windshield survey was conducted from public roadways to identify water meters, fire hydrants, valves, and any potential well heads/well houses. Prior to conducting the field reconnaissance, HDR personnel reviewed orthophotography obtained from NC OneMap GeoSpatial portal (dated 2010) to identify any potential well heads/well houses and surface waters within a 0.5-mile radius of the ash basin compliance boundary.

In addition, HDR personnel contacted Duke Energy site personnel to identify water supply wells located on Duke Energy property.

HDR field personnel did not identify private or public water supply wells (including irrigation wells and unused or abandoned wells) located outside of Duke Energy’s property within a 0.5- mile radius of the ash basin compliance boundary during the field reconnaissance. Duke Energy personnel familiar with water supply wells at RBSS reported that three wells are present on Duke Energy’s property. These wells (PWS: NC01367706, Well 1, and Well 2) are identified on Figure 3 and available property and well information is provided in Table 1. Duke Energy personnel indicated that these three wells are not used for drinking water supply. Duke Energy personnel reported that the wells do not appear to be abandoned but are not currently in use. Well 1 located near the Lark Maintenance Area has reportedly never been used for a drinking

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SECTION 3 – DRINKING WATER SUPPLY WELL AND RECEPTOR SURVEY ACTIVITIES AND FINDINGS

water supply and may be used for irrigation purposes only. The use of Well 2 is reportedly unknown but may have been used as a drinking water source in the past.

Water meters, fire hydrants, and valve markings were identified at properties with structures located in Gaston County within a 0.5-mile radius of the ash basin compliance boundary.

From the public roadway, HDR personnel did not identify indications of municipal water supply for the properties located in Mecklenburg County within a 0.5-mile radius of the ash basin compliance boundary. 3.7 Additional Survey Activities HDR is in the process of mailing drinking water supply well survey questionnaires to property owners within a 0.5-mile radius of the RBSS ash basin compliance boundary requesting information on the presence of water supply wells and well usage for the properties. The results of the well survey questionnaires will be submitted to NCDENR by November 7, 2014. 3.8 USGS Hydrography Review HDR reviewed the USGS National Hydrography Dataset (NHD) obtained from the USGS National Map Viewer (http://viewer.nationalmap.gov/viewer/) to identify any surface waters features within a 0.5-mile radius of the ash basin compliance boundary. Hydrography data obtained from the USGS NHD is included on Figure 3.

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SECTION 4 - SITE GEOLOGY AND HYDROGEOLOGY

Section 4 - Site Geology and Hydrogeology

4.1 Generalized Site Hydrogeologic Conceptual Model North Carolina is divided into distinct regions by portions of three physiographic provinces: the Atlantic Coastal Plain, Piedmont, and Blue Ridge (Fenneman, 1938). RBSS is located in the Charlotte terrane within the Piedmont province. The Piedmont province is bounded to the east and southeast by the Atlantic Coastal Plain and to the west by the escarpment of the Blue Ridge Mountains, covering a distance of 150 to 225 miles (LeGrand, 2004). Piedmont bedrock primarily consists of igneous and metamorphic bedrock. The fractured bedrock is overlain by a mantle of unconsolidated material known as regolith. The regolith includes, where present, the soil zone, a zone of weathered, decomposed bedrock known as saprolite, and where present, alluvium. Saprolite, the product of chemical and mechanical weathering of the underlying bedrock, is typically composed of clay and coarser granular material up to boulder size and may reflect the texture of the rock from which it was formed. The weathering product of granitic rocks may be quartz-rich and sandy-textured, whereas rocks poor in quartz and rich in feldspar and other soluble minerals form a more clayey saprolite. The regolith serves as the principal storage reservoir for the underlying bedrock (LeGrand 2004).

A transition zone may occur at the base of the regolith between the soil-saprolite and the unweathered bedrock. This transition zone of partially weathered rock is a zone of relatively high permeability compared to the overlying soil-saprolite and the underlying bedrock (LeGrand 2004).

RBSS is located in the Charlotte terrane of the Carolina Zone (Pippin and others, 2008), or in the older belt terminology, the Charlotte Belt of the Piedmont physiographic province (Piedmont) (North Carolina Geological Survey, 1985). The Charlotte terrane is characterized by mostly felsic to mafic plutonic rocks which intrude a suite of mainly metaigneous rocks and minor metasedimentary rocks (Pippin and others, 2008).

Based on the location of the site on the Geologic Map of the Charlotte 1º x 2º Quadrangle, North and South Carolina, the underlying bedrock at the site is composed of metamorphosed quartz diorite and tonalite (mqd). The mqd unit is described as gray, usually medium- to coarse- grained, generally foliated rock composed dominantly of plagioclase, quartz biotite, hornblende, and epidote. Biotite, hornblende, and epidote are commonly associated in clots replacing original mafic phenocrysts; clots may be smeared out, thus defining foliation (Goldsmith and others 1988).

Groundwater flow paths in the Piedmont are almost invariably restricted to the zone underlying the topographic slope extending from a topographic divide to an adjacent stream. LeGrand describes this as the local slope aquifer system. Under natural conditions, the general direction of groundwater flow can be approximated from the surface topography (LeGrand 2004).

Groundwater recharge in the Piedmont is derived entirely from infiltration of local precipitation. Groundwater recharge occurs in areas of higher topography (i.e., hilltops) and groundwater

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SECTION 4 - SITE GEOLOGY AND HYDROGEOLOGY

discharge occurs in lowland areas bordering surface water bodies, marshes, and floodplains (LeGrand 2004). 4.2 Site Geology and Hydrogeology Based on a review of soil boring and monitoring well installation logs provided by Duke Energy, subsurface stratigraphy consists of the following material types: fill, ash, alluvium, residuum, saprolite, partially weathered rock (PWR), and bedrock. In general, residuum, saprolite and PWR were encountered on most areas of the site. Alluvium was encountered in borings advanced along the northeastern extent of the Secondary Cell, within close proximity to Mountain Island Lake. Bedrock was encountered sporadically across the site ranging in depth from 34 feet on the northern extent of the site to greater than 200 feet on the southern extent of the site near Horseshoe Bend Beach Road. The general stratigraphic units, in sequence from the ground surface down to boring termination, are defined as follows:

 Fill – Fill material generally consisted of re-worked silts and clays that were borrowed from one area of the site and re-distributed to other areas. Fill was used in the construction of dikes and presumably as cover for the ash storage area.  Ash – Although previous exploration activities, for which Duke Energy provided boring logs, did not evaluate ash management areas of the site, ash is expected to be present within the ash basins and ash and cinder storage areas.  Alluvium – Alluvium is unconsolidated soil and sediment that has been eroded and redeposited by streams and rivers. Alluvium may consist of a variety of materials ranging from silts and clays to sands and gravels. Alluvium was encountered in three boring locations at the base of the northern embankment of the Secondary Cell, proximal to Mountain Island Lake. Alluvium in these borings was described as yellowish red to reddish yellow silty clay to clayey sand with well rounded quartz pebbles.  Residuum – Residuum is the in-place weathered soil that consists of white, orange, tan, brown, gray or black sandy clay to clayey sand. This unit was encountered in various thicknesses across the site.  Saprolite – Saprolite is soil developed by in-place weathering of rock similar to the bedrock that consists of brown, tan, or green silty sand with trace mica. The primary distinction from residuum is that saprolite typically retains some structure (e.g., mineral banding) from the parent rock. This unit was found in most areas across the site and was described as white, orange, red, brown or black crumbly extremely weathered rock with relict rock structure.  Partially Weathered Rock (PWR) – PWR occurs between the saprolite and bedrock and contains saprolite and rock remnants. This unit was described as white to brownish yellow to greenish gray with quartz and potassium feldspar fragments.  Bedrock – Bedrock was encountered in three deep borings completed around the northern extent of the Secondary Cell and the western extent of the Primary Cell. Depth to top of bedrock ranged from 34 feet to 51 feet below ground surface (bgs). Bedrock was described as granite, quartzite and gneiss.

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SECTION 4 - SITE GEOLOGY AND HYDROGEOLOGY

4.3 Groundwater Flow Directions In 2011, Duke Energy provided Altamont Environmental, Inc. (Altamont) information on the groundwater monitoring wells installed at the ash basin and information on the water levels in the ash basin. Altamont utilized this information along with consideration of adjacent bodies of water and site topography to develop generalized groundwater direction flow arrows for the areas adjacent to the ash basins. This information was presented in the report titled Generalized Groundwater Flow Direction Maps for Ash Basins, Duke Energy Carolinas, LLC, Fossil Stations, December 12, 2011. The report contained figures with similar generalized groundwater flow arrows for all seven of the Duke Energy Carolinas fossil station ash basins. The information from that report is used with the permission of Duke Energy.

As stated in Section 3.0 of the Altamont report:

The purpose of the Generalized Ash Basin Groundwater Flow Direction Maps, Figures 1 through 7, is to provide Duke with an interpretation of the generalized groundwater flow directions in the areas surrounding the ash basins. The maps were developed utilizing existing data that were readily available and with data collected as part of on-going monitoring at the ash basins. No additional field investigation was conducted as part of the development of the maps.

The maps are not intended to provide absolute groundwater flow direction data at a specific location. Rather, they are an interpretation of the generalized groundwater flow direction for the shallow water table based on readily available data.

As described in the following sections (Section 4.0, Section 5.0, and Section 6.0), there may be hydrogeologic conditions present at the ash basins that cause groundwater flow conditions to differ from the generalized groundwater flow directions shown on Figures 1 through 7.

The generalized groundwater flow directions were determined based on a consideration of the information described above, most notably that the sites are located in the Piedmont physiographic province. In addition, the generalizations of typical Piedmont hydrogeology found in A Master Conceptual Model for Hydrogeological Site Characterization in the Piedmont and Mountain Region of North Carolina (LeGrand 2004) apply to these sites.

As stated in Section 5.0 of the Altamont report, the possible effects of pumping from adjacent water supply wells were not considered in the development of the generalized groundwater flow direction arrows.

The groundwater elevations used in development of the generalized groundwater direction flow arrows were from the compliance groundwater monitoring wells (compliance wells) monitored in association with the NPDES permits and from groundwater monitoring wells voluntarily (voluntary wells) installed by Duke Energy. Groundwater elevation data readings have not been

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SECTION 4 - SITE GEOLOGY AND HYDROGEOLOGY

routinely measured in the voluntary wells since January 2012. The compliance wells were installed in 2010 and 2011.

Section 7.0 of the Altamont report discusses the development of the generalized groundwater flow direction arrows and the relative level of confidence in the interpretation of the generalized flow direction as follows:

Groundwater flow direction arrows are used to depict the interpreted direction of generalized groundwater flow. Three different colors of arrows were used to indicate the relative level of confidence in the interpretation of the generalized groundwater flow direction.

The relative level of confidence in the interpretation of flow direction was determined by:

 The distance from groundwater monitoring wells or surface water elevation data

 The number of groundwater data elevation points utilized

 Consideration of the surface topography

Descriptions of the relative confidence levels indicated by groundwater flow direction arrow colors are as follows:

 Black arrows represent high confidence in the groundwater flow direction interpretation. The black arrows were used in areas in which there were several known groundwater or surface water elevation data points and the surface topography supported the interpretation of groundwater flow characteristic of typical Piedmont groundwater flow.

 Gray arrows represent moderate confidence in the groundwater flow direction interpretation. The gray arrows were used in areas where at least one groundwater or surface water elevation point was known or in areas where there was strong surface topographic data to support the groundwater flow direction interpretation.

 White arrows represent estimated groundwater flow direction interpretation. The white arrows were used in areas where there was little or no groundwater or surface water elevation data and there was not conclusive surface topographic data to support a gray arrow.

Since limited groundwater elevation data readings were performed on the voluntary wells after January 2012, HDR reviewed the historic groundwater level data available from the compliance groundwater monitoring wells in conjunction with the current approximate ash basin pond elevation data.

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SECTION 4 - SITE GEOLOGY AND HYDROGEOLOGY

HDR found the generalized groundwater flow direction arrows presented in the Altamont report to generally represent the probable direction of groundwater flow for the shallow water table aquifer based on available data. As stated in the Altamont report, the generalized groundwater flow direction arrows present an interpretation of flow direction based on data from the shallow water table aquifer and do not consider the possible effects of pumping from adjacent water supply wells.

The generalized groundwater flow directions for the area adjacent to the RBSS ash basin are found on Figure 3.

Based on the site generalized hydrogeological conceptual model by LeGrand, groundwater levels measured in the site monitoring wells and the generalized groundwater flow direction arrows, a potential area of interest with respect to the RBSS ash basin groundwater flow has been delineated on Figure 3. This area is considered to be potentially downgradient of the RBSS ash basin, based on available information. The groundwater flow direction on the south side of the area of interest is inferred due to lack of groundwater data and/or strong topographic data. Mountain Island Lake is expected to be the groundwater discharge region for groundwater flow from the ash basin and is considered to be a hydrologic boundary for groundwater flow between the ash basin and the properties to the north of Mountain Island Lake. All of the property within the potential area of interest is owned by Duke Energy.

Duke Energy will be installing additional groundwater monitoring wells onsite as part of a RBSS ash basin comprehensive site assessment. The groundwater flow across the site will be reviewed after the new groundwater elevation data from these monitoring wells are available.

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SECTION 5 - SUMMARY OF FINDINGS

Section 5 - Summary of Findings A summary of the receptor Survey findings is provided below. The identified water supply wells (including irrigation wells and unused or abandoned wells) are shown on Figure 3. Available property and well information for the identified wells is provided in Table 1.

 One private water supply well is assumed to provide water to the residence located to the northeast of RBSS within a 0.5-mile radius of the ash basin compliance boundary. This well is located across Mountain Island Lake in Mecklenburg County (Well 3).

 Two private water supply wells were reported at the RBSS site. The wells are reportedly not currently used for drinking water supply. One of the wells has reportedly never been used for drinking water supply and was used for irrigation purposes only. Duke Energy personnel report that the wells do not appear to be abandoned and are not currently in use (Well 1 and Well 2).

 One public water supply well (PWS: NC0136706) was reported at the RBSS site. Duke Energy personnel report that the well does not appear to be abandoned and is not currently in use.

 No wellhead protection areas were identified within a 0.5-mile radius of the ash basin compliance boundary.

 Several surface water features that flow toward Mountain Island Lake were identified within a 0.5-mile radius of the ash basin.

 No water supply wells (including irrigation wells and unused or abandoned wells) were identified within the ash basin potential area of interest.

 A report with the results from the water supply well questionnaire mailings will be sent to NCDENR by November 7, 2014.

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SECTION 6 - REFERENCES

Section 6 - References Altamont Environmental, Inc. Generalized Groundwater Flow Direction Maps for Ash Basins, Duke Energy Carolinas, LLC, Fossil Stations, December 12, 2011.

Fenneman, Nevin Melancthon. Physiography of eastern United States. McGraw-Hill. 1938.

Goldsmith, R., Milton, D. J., and Horton, J. W, Jr. 1988. Geologic map of the Charlotte 1° x 2° quadrangle, North Carolina and South Carolina: United States Geological Survey, Miscellaneous Investigations Series, Map I-1251-E, scale 1:250,000.

LeGrand, Harry, Sr. 2004. A Master Conceptual Model for Hydrogeological Site Characterization in the Piedmont and Mountain Region of North Carolina, North Carolina Department of Environment and Natural Resources.

Pippin, Charles, G., Chapman, Melinda, J., Huffman, Brad A., Heller, Matthew J., and Schelgel, Melissa E. 2008. Hydrogeologic Setting, Ground-Water Flow, and Ground- at the Langtree Peninsula Research Station, Iredell County, North Carolina, 2000-2005, United States Geological Survey, Prepared in cooperation with the North Carolina Department of Environment and Natural Resources, Division of Water Quality.

15

Figures

Tables

Table 1 Public and Private Water Supply Wells Within 0.5 Mile Radius of Riverbend Ash Basin Compliance Boundary Duke Energy Carolinas, LLC/Riverbend Steam Station

Distance from Well Well Well Well ID Public Water Property Address Reported Ash Basin Direction from Casing Well Owner/ User Parcel ID Number Depth Yield (shown on Figure 3) System Name (well location) Well Use Compliance Ash Basin Depth (ft-bgs) (gpm) Boundary (ft) (ft-bgs) Public Water Supply Wells Unknown (reported by Duke Energy as not used for drinking Duke Power - Duke Energy Carolinas, LLC 175 Steam Plant Road 175033 water once station PWS: NC01367706 Riverbend Steam Approx. 625 Southwest N/A N/A N/A (owner) Mount Holly, NC 28120 (Gaston County) connected to Mount Holly Station Public Utilities Department in March 2001) Recorded Water Supply Wells Duke Energy Carolinas, LLC 175 Steam Plant Road 175022 1 N/A Irrigation Approx. 1,975 West N/A N/A N/A (owner) Mount Holly, NC 28120 (Gaston County) Unknown Duke Energy Carolinas, LLC 175 Steam Plant Road 175033 (reported by Duke Energy 2 N/A Approx. 1,750 Southwest N/A N/A N/A (owner) Mount Holly, NC 28120 (Gaston County) as may have been used for drinking water) Assumed Water Supply Wells Eugenia and Robert White 4050 Neck Rd 1318106 3 N/A Assumed Domestic Approx. 2,300 Northeast N/A N/A N/A (property owner) Huntersville, NC 28078 (Mecklenburg County)

Notes: 1. Well locations are shown on Figure 3. 2. Owner and property address information for water supply wells obtained from Mecklenburg County's online Property Ownership and Land Records Information System (POLARIS). 3. Distances between water supply wells and the ash basin compliance boundary are approximate. 4. N/A indicates not available. 5. (ft-bgs) indicates feet below ground surface. 6. (gpm) indicates gallons per minute.

Page 1 of 1

Appendix A EDR GeoCheck Report Riverbend Steam Station 175 Steam Plant Road, Mounty Holly, NC Inquiry Number: 4073890.1s September 22, 2014

Riverbend Steam Station 175 Steam Plant Road Mount Holly, NC 28120

Inquiry Number: 4073890.1s September 22, 2014

The EDR GeoCheck® Report

6 Armstrong Road, 4th floor Shelton, CT 06484 Toll Free: 800.352.0050 www.edrnet.com

FORM-NULL-SPM TABLE OF CONTENTS

SECTION PAGE

GEOCHECK ADDENDUM

Physical Setting Source Addendum A-1 Physical Setting Source Summary A-2 Physical Setting Source Map A-7 Physical Setting Source Map Findings A-8 Physical Setting Source Records Searched PSGR-1

Thank you for your business. Please contact EDR at 1-800-352-0050 with any questions or comments.

Disclaimer - Copyright and Trademark Notice This Report contains certain information obtained from a variety of public and other sources reasonably available to Environmental Data Resources, Inc. It cannot be concluded from this Report that coverage information for the target and surrounding properties does not exist from other sources. NO WARRANTY EXPRESSED OR IMPLIED, IS MADE WHATSOEVER IN CONNECTION WITH THIS REPORT. ENVIRONMENTAL DATA RESOURCES, INC. SPECIFICALLY DISCLAIMS THE MAKING OF ANY SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE OR PURPOSE. ALL RISK IS ASSUMED BY THE USER. IN NO EVENT SHALL ENVIRONMENTAL DATA RESOURCES, INC. BE LIABLE TO ANYONE, WHETHER ARISING OUT OF ERRORS OR OMISSIONS, NEGLIGENCE, ACCIDENT OR ANY OTHER CAUSE, FOR ANY LOSS OF DAMAGE, INCLUDING, WITHOUT LIMITATION, SPECIAL, INCIDENTAL, CONSEQUENTIAL, OR EXEMPLARY DAMAGES. ANY LIABILITY ON THE PART OF ENVIRONMENTAL DATA RESOURCES, INC. IS STRICTLY LIMITED TO A REFUND OF THE AMOUNT PAID FOR THIS REPORT. Purchaser accepts this Report "AS IS". Any analyses, estimates, ratings, environmental risk levels or risk codes provided in this Report are provided for illustrative purposes only, and are not intended to provide, nor should they be interpreted as providing any facts regarding, or prediction or forecast of, any environmental risk for any property. Only a Phase I Environmental Site Assessment performed by an environmental professional can provide information regarding the environmental risk for any property. Additionally, the information provided in this Report is not to be construed as legal advice. Copyright 2014 by Environmental Data Resources, Inc. All rights reserved. Reproduction in any media or format, in whole or in part, of any report or map of Environmental Data Resources, Inc., or its affiliates, is prohibited without prior written permission. EDR and its logos (including Sanborn and Sanborn Map) are trademarks of Environmental Data Resources, Inc. or its affiliates. All other trademarks used herein are the property of their respective owners.

TC4073890.1s Page 1 GEOCHECK® - PHYSICAL SETTING SOURCE REPORT

TARGET PROPERTY ADDRESS

RIVERBEND STEAM STATION 175 STEAM PLANT ROAD MOUNT HOLLY, NC 28120

TARGET PROPERTY COORDINATES

Latitude (North): 35.3665 - 35˚ 21’ 59.40’’ Longitude (West): 80.9625 - 80˚ 57’ 45.00’’ Universal Tranverse Mercator: Zone 17 UTM X (Meters): 503406.7 UTM Y (Meters): 3913489.8 Elevation: 685 ft. above sea level

USGS TOPOGRAPHIC MAP

Target Property Map: 35080-C8 MOUNTAIN ISLAND LAKE, NC Most Recent Revision: 1997

North Map: 35080-D8 SOUTH, NC Most Recent Revision: 1996

EDR’s GeoCheck Physical Setting Source Addendum is provided to assist the environmental professional in forming an opinion about the impact of potential contaminant migration.

Assessment of the impact of contaminant migration generally has two principal investigative components:

1. Groundwater flow direction, and 2. Groundwater flow velocity.

Groundwater flow direction may be impacted by surface topography, hydrology, hydrogeology, characteristics of the soil, and nearby wells. Groundwater flow velocity is generally impacted by the nature of the geologic strata.

TC4073890.1s Page 1 GEOCHECK® - PHYSICAL SETTING SOURCE SUMMARY

GROUNDWATER FLOW DIRECTION INFORMATION Groundwater flow direction for a particular site is best determined by a qualified environmental professional using site-specific well data. If such data is not reasonably ascertainable, it may be necessary to rely on other sources of information, such as surface topographic information, hydrologic information, hydrogeologic data collected on nearby properties, and regional groundwater flow information (from deep aquifers).

TOPOGRAPHIC INFORMATION Surface topography may be indicative of the direction of surficial groundwater flow. This information can be used to assist the environmental professional in forming an opinion about the impact of nearby contaminated properties or, should contamination exist on the target property, what downgradient sites might be impacted.

TARGET PROPERTY TOPOGRAPHY General Topographic Gradient: General North

SURROUNDING TOPOGRAPHY: ELEVATION PROFILES 790 754 747 745 733 722 720 718 713 712 694 690 687 685 685 674 649 649 649 Elevation (ft)

North South TP 719 711 690 689 685 685 682 674 662 658 650 650 649 649 649 649 649 649 637 Elevation (ft)

West East TP 0 1/2 1 Miles ✩Target Property Elevation: 685 ft.

Source: Topography has been determined from the USGS 7.5’ Digital Elevation Model and should be evaluated on a relative (not an absolute) basis. Relative elevation information between sites of close proximity should be field verified.

TC4073890.1s Page 2 GEOCHECK® - PHYSICAL SETTING SOURCE SUMMARY

HYDROLOGIC INFORMATION Surface water can act as a hydrologic barrier to groundwater flow. Such hydrologic information can be used to assist the environmental professional in forming an opinion about the impact of nearby contaminated properties or, should contamination exist on the target property, what downgradient sites might be impacted.

Refer to the Physical Setting Source Map following this summary for hydrologic information (major waterways and bodies of water).

FEMA FLOOD ZONE FEMA Flood Target Property County Electronic Data GASTON, NC YES - refer to the Overview Map and Detail Map

Flood Plain Panel at Target Property: 37071C - FEMA DFIRM Flood data

Additional Panels in search area: 37119C - FEMA DFIRM Flood data

NATIONAL WETLAND INVENTORY NWI Electronic NWI Quad at Target Property Data Coverage MOUNTAIN ISLAND LAKE YES - refer to the Overview Map and Detail Map

HYDROGEOLOGIC INFORMATION Hydrogeologic information obtained by installation of wells on a specific site can often be an indicator of groundwater flow direction in the immediate area. Such hydrogeologic information can be used to assist the environmental professional in forming an opinion about the impact of nearby contaminated properties or, should contamination exist on the target property, what downgradient sites might be impacted.

AQUIFLOW® Search Radius: 1.000 Mile.

EDR has developed the AQUIFLOW Information System to provide data on the general direction of groundwater flow at specific points. EDR has reviewed reports submitted by environmental professionals to regulatory authorities at select sites and has extracted the date of the report, groundwater flow direction as determined hydrogeologically, and the depth to water table.

LOCATION GENERAL DIRECTION MAP ID FROM TP GROUNDWATER FLOW Not Reported

TC4073890.1s Page 3 GEOCHECK® - PHYSICAL SETTING SOURCE SUMMARY

GROUNDWATER FLOW VELOCITY INFORMATION Groundwater flow velocity information for a particular site is best determined by a qualified environmental professional using site specific geologic and soil strata data. If such data are not reasonably ascertainable, it may be necessary to rely on other sources of information, including geologic age identification, rock stratigraphic unit and soil characteristics data collected on nearby properties and regional soil information. In general, contaminant plumes move more quickly through sandy-gravelly types of soils than silty-clayey types of soils.

GEOLOGIC INFORMATION IN GENERAL AREA OF TARGET PROPERTY Geologic information can be used by the environmental professional in forming an opinion about the relative speed at which contaminant migration may be occurring.

ROCK STRATIGRAPHIC UNIT GEOLOGIC AGE IDENTIFICATION

Era: Paleozoic Category: Plutonic and Intrusive Rocks System: Ordovian Series: Lower Paleozoic granitic rocks Code: Pzg1 (decoded above as Era, System & Series)

Geologic Age and Rock Stratigraphic Unit Source: P.G. Schruben, R.E. Arndt and W.J. Bawiec, Geology of the Conterminous U.S. at 1:2,500,000 Scale - a digital representation of the 1974 P.B. King and H.M. Beikman Map, USGS Digital Data Series DDS - 11 (1994).

DOMINANT SOIL COMPOSITION IN GENERAL AREA OF TARGET PROPERTY

The U.S. Department of Agriculture’s (USDA) Soil Conservation Service (SCS) leads the National Cooperative Soil Survey (NCSS) and is responsible for collecting, storing, maintaining and distributing soil survey information for privately owned lands in the United States. A soil map in a soil survey is a representation of soil patterns in a landscape. Soil maps for STATSGO are compiled by generalizing more detailed (SSURGO) soil survey maps. The following information is based on Soil Conservation Service STATSGO data.

Soil Component Name: CECIL

Soil Surface Texture: sandy clay loam

Hydrologic Group: Class B - Moderate infiltration rates. Deep and moderately deep, moderately well and well drained soils with moderately coarse textures.

Soil Drainage Class: Well drained. Soils have intermediate water holding capacity. Depth to water table is more than 6 feet.

Hydric Status: Soil does not meet the requirements for a hydric soil.

Corrosion Potential - Uncoated Steel: HIGH

Depth to Bedrock Min: > 60 inches

Depth to Bedrock Max: > 60 inches

TC4073890.1s Page 4 GEOCHECK® - PHYSICAL SETTING SOURCE SUMMARY

Soil Layer Information

Boundary Classification Layer Upper Lower Soil Texture Class AASHTO Group Unified SoilPermeability Soil Reaction Rate (in/hr) (pH)

1 0 inches 7 inches sandy clay loam Silt-Clay COARSE-GRAINED Max: 2.00 Max: 6.50 Materials (more SOILS, Sands, Min: 0.60 Min: 4.50 than 35 pct. Sands with fines, passing No. Silty Sand. 200), Silty Soils. 2 7 inches 11 inches sandy clay loam Silt-Clay COARSE-GRAINED Max: 2.00 Max: 5.50 Materials (more SOILS, Sands, Min: 0.60 Min: 4.50 than 35 pct. Sands with fines, passing No. Silty Sand. 200), Silty Soils. 3 11 inches 50 inches clay Silt-Clay FINE-GRAINED Max: 2.00 Max: 5.50 Materials (more SOILS, Silts and Min: 0.60 Min: 4.50 than 35 pct. Clays (liquid passing No. limit 50% or 200), Clayey more), Elastic Soils. silt. 4 50 inches 75 inches variable Not reported Not reported Max: 0.00 Max: 0.00 Min: 0.00 Min: 0.00

OTHER SOIL TYPES IN AREA

Based on Soil Conservation Service STATSGO data, the following additional subordinant soil types may appear within the general area of target property.

Soil Surface Textures: sandy loam loam clay loam silt loam very channery - silt loam gravelly - sandy loam

Surficial Soil Types: sandy loam loam clay loam silt loam very channery - silt loam gravelly - sandy loam

Shallow Soil Types: sandy clay silt loam silty clay loam clay very channery - silt loam loam

Deeper Soil Types: silty clay loam weathered bedrock fine sandy loam unweathered bedrock sandy clay loam

TC4073890.1s Page 5 GEOCHECK® - PHYSICAL SETTING SOURCE SUMMARY

LOCAL / REGIONAL WATER AGENCY RECORDS

EDR Local/Regional Water Agency records provide water well information to assist the environmental professional in assessing sources that may impact ground water flow direction, and in forming an opinion about the impact of contaminant migration on nearby drinking water wells.

WELL SEARCH DISTANCE INFORMATION

DATABASE SEARCH DISTANCE (miles) Federal USGS 1.000 Federal FRDS PWS 1.000 State Database 1.000

FEDERAL USGS WELL INFORMATION LOCATION MAP ID WELL ID FROM TP 2 USGS40000886680 1/2 - 1 Mile SW 3 USGS40000886687 1/2 - 1 Mile WSW

FEDERAL FRDS PUBLIC WATER SUPPLY SYSTEM INFORMATION LOCATION MAP ID WELL ID FROM TP 1 NC0136706 1/4 - 1/2 Mile SSW

Note: PWS System location is not always the same as well location.

STATE DATABASE WELL INFORMATION LOCATION MAP ID WELL ID FROM TP No Wells Found

TC4073890.1s Page 6 6 7 0 0 6 8 0 0 8

6 6 6 8 0 720 0 7 8 6 0 760 7 2 6 7 20 8 0

7 2 0 720 7 0 2 2 0 7 40 6 80 7 6 2 0 6 8 0 6 40 0 7 6 0 7 20 6 6 6 4 2 8 8 0 0 7 0

7 2 0 0 7 2 0 6 8 0 2 8 6 7 7 0 6 0 0 6 8 6 0 8

8 0 8 00 6 720 2 0 7 7 7 6 0 20 0 6 8

6 2 0 0 8 6 0 7 6 0 0 8 6 7 8 0 7 0 6 7 2 6 0 0 0 0 7 8 2 2 6 0 0 7 7 8 0 6 6 8 0 8 720 0 20 20 0 7 7 7 6

2 0 7 7 640 7 2 0 2 0 6 7 20 8 0 6 720 8 680 0 20 0 6 0 0 4 8 7 680 8 6 6

0 7

2

0 0 6 6 8 6 4 0 0 8 8

0 6 6 8 0 6 8 20 0 7 8 0 0 6 7 2 7 2 7 6 0 0 720

720 7 2 7 60 0 2 0 7 2 7 0 760 6 8 0 7 7 60 0 2 6 2 7 0 7 20 8 6 0 60 2 760 7 7 0 7 7 0 7 2 0 6 0

720 7

2 0 7 2 7 0 0

2 7 20

60 6 0 7 7 60 720 7 7 7 680 0 20 20 7 8 80 6

6 0 8 7 2 0 720

6 7 7 2 0 0 2 60 7 20 8 7 0 6 7 6 2 8 8 6 6 0

7 0 0 6 0

20 8 6 7 0 0 8

2 0 0 7 8 6 7 7 2 60 0 NC

6 80

6 8 6 0 8 0 680 6 8 0 8 0 6 7 2 0 0 6 4 0 6 8 0 6 80 2 0 7 6 8 0

EDR Inc. GEOCHECK ® - PHYSICAL SETTING SOURCE MAP FINDINGS

Map ID Direction Distance Elevation Database EDR ID Number 1 SSW FRDS PWS NC0136706 1/4 - 1/2 Mile Higher PWS ID: NC0136706 Date Initiated: 7706 Date Deactivated: Not Reported PWS Name: DUKE POWER-RIVERBEND STEAM STA 28120

Addressee / Facility: System Owner/Responsible Party L G DUCKWORTH MAST MECH PO BOX 367 ATN W M CAVIN MT HOLLY, NC 28120

Addressee / Facility: System Owner/Responsible Party DUKE POWER STEAM PROD DEPT

Facility Latitude: 35 21 40 Facility Longitude: 080 58 00 City Served: Not Reported Treatment Class: Treated Population: 00000026

Violations information not reported.

ENFORCEMENT INFORMATION:

System Name: DUKE POWER-RIVERBEND STEAM Violation Type: Monitoring, Routine Major (TCR) Contaminant: COLIFORM (TCR) Compliance Period: 1999-10-01 - 1999-12-31 Violation ID: 0003296 Enforcement Date: 2000-02-04 Enf. Action: State Formal NOV Issued System Name: DUKE POWER-RIVERBEND STEAM Violation Type: Monitoring, Routine Major (TCR) Contaminant: COLIFORM (TCR) Compliance Period: 1999-10-01 - 1999-12-31 Violation ID: 0003296 Enforcement Date: 2000-02-04 Enf. Action: State Public Notif Requested

2 SW FED USGS USGS40000886680 1/2 - 1 Mile Higher Org. Identifier: USGS-NC Formal name: USGS North Carolina Water Science Center Monloc Identifier: USGS-352131080583001 Monloc name: GS-001 Monloc type: Well Monloc desc: Not Reported Huc code: Not Reported Drainagearea value: Not Reported Drainagearea Units: Not Reported Contrib drainagearea: Not Reported Contrib drainagearea units: Not Reported Latitude: 35.3587489 Longitude: -80.9747968 Sourcemap scale: Not Reported

TC4073890.1s Page 8 GEOCHECK ® - PHYSICAL SETTING SOURCE MAP FINDINGS

Horiz Acc measure: 1 Horiz Acc measure units: seconds Horiz Collection method: Interpolated from map Horiz coord refsys: NAD83 Vert measure val: Not Reported Vert measure units: Not Reported Vertacc measure val: Not Reported Vert accmeasure units: Not Reported Vertcollection method: Not Reported Vert coord refsys: Not Reported Countrycode: US Aquifername: Piedmont and Blue Ridge crystalline-rock aquifers Formation type: Felsic Metaigneous Rock Aquifer type: Not Reported Construction date: Not Reported Welldepth: 437.5 Welldepth units: ft Wellholedepth: Not Reported Wellholedepth units: Not Reported

Ground-water levels, Number of Measurements: 0

3 WSW FED USGS USGS40000886687 1/2 - 1 Mile Lower Org. Identifier: USGS-NC Formal name: USGS North Carolina Water Science Center Monloc Identifier: USGS-352133080583701 Monloc name: GS-003 Monloc type: Well Monloc desc: Not Reported Huc code: Not Reported Drainagearea value: Not Reported Drainagearea Units: Not Reported Contrib drainagearea: Not Reported Contrib drainagearea units: Not Reported Latitude: 35.3593044 Longitude: -80.9767413 Sourcemap scale: Not Reported Horiz Acc measure: 1 Horiz Acc measure units: seconds Horiz Collection method: Interpolated from map Horiz coord refsys: NAD83 Vert measure val: Not Reported Vert measure units: Not Reported Vertacc measure val: Not Reported Vert accmeasure units: Not Reported Vertcollection method: Not Reported Vert coord refsys: Not Reported Countrycode: US Aquifername: Piedmont and Blue Ridge crystalline-rock aquifers Formation type: Felsic Metaigneous Rock Aquifer type: Not Reported Construction date: Not Reported Welldepth: 305 Welldepth units: ft Wellholedepth: Not Reported Wellholedepth units: Not Reported

Ground-water levels, Number of Measurements: 0

TC4073890.1s Page 9 GEOCHECK ® - PHYSICAL SETTING SOURCE MAP FINDINGS RADON

AREA RADON INFORMATION

Federal EPA Radon Zone for GASTON County: 2 Note: Zone 1 indoor average level > 4 pCi/L. : Zone 2 indoor average level >= 2 pCi/L and <= 4 pCi/L. : Zone 3 indoor average level < 2 pCi/L.

Federal Area Radon Information for Zip Code: 28120 Number of sites tested: 8 Area Average Activity % <4 pCi/L % 4-20 pCi/L % >20 pCi/L

Living Area - 1st Floor 0.150 pCi/L 100% 0% 0% Living Area - 2nd Floor Not Reported Not Reported Not Reported Not Reported Basement Not Reported Not Reported Not Reported Not Reported

TC4073890.1s Page 10 PHYSICAL SETTING SOURCE RECORDS SEARCHED

TOPOGRAPHIC INFORMATION

USGS 7.5’ Digital Elevation Model (DEM) Source: United States Geologic Survey EDR acquired the USGS 7.5’ Digital Elevation Model in 2002 and updated it in 2006. The 7.5 minute DEM corresponds to the USGS 1:24,000- and 1:25,000-scale topographic quadrangle maps. The DEM provides elevation data with consistent elevation units and projection.

HYDROLOGIC INFORMATION

Flood Zone Data: This data, available in select counties across the country, was obtained by EDR in 2003 & 2011 from the Federal Emergency Management Agency (FEMA). Data depicts 100-year and 500-year flood zones as defined by FEMA.

NWI: National Wetlands Inventory. This data, available in select counties across the country, was obtained by EDR in 2002, 2005 and 2010 from the U.S. Fish and Wildlife Service.

State Wetlands Data: Wetlands Inventory Source: Department of Environment & Natural Resources Telephone: 919-733-2090

HYDROGEOLOGIC INFORMATION

AQUIFLOW R Information System Source: EDR proprietary database of groundwater flow information EDR has developed the AQUIFLOW Information System (AIS) to provide data on the general direction of groundwater flow at specific points. EDR has reviewed reports submitted to regulatory authorities at select sites and has extracted the date of the report, hydrogeologically determined groundwater flow direction and depth to water table information.

GEOLOGIC INFORMATION

Geologic Age and Rock Stratigraphic Unit Source: P.G. Schruben, R.E. Arndt and W.J. Bawiec, Geology of the Conterminous U.S. at 1:2,500,000 Scale - A digital representation of the 1974 P.B. King and H.M. Beikman Map, USGS Digital Data Series DDS - 11 (1994).

STATSGO: State Soil Geographic Database Source: Department of Agriculture, Natural Resources Conservation Services The U.S. Department of Agriculture’s (USDA) Natural Resources Conservation Service (NRCS) leads the national Conservation Soil Survey (NCSS) and is responsible for collecting, storing, maintaining and distributing soil survey information for privately owned lands in the United States. A soil map in a soil survey is a representation of soil patterns in a landscape. Soil maps for STATSGO are compiled by generalizing more detailed (SSURGO) soil survey maps.

SSURGO: Soil Survey Geographic Database Source: Department of Agriculture, Natural Resources Conservation Services (NRCS) Telephone: 800-672-5559 SSURGO is the most detailed level of mapping done by the Natural Resources Conservation Services, mapping scales generally range from 1:12,000 to 1:63,360. Field mapping methods using national standards are used to construct the soil maps in the Soil Survey Geographic (SSURGO) database. SSURGO digitizing duplicates the original soil survey maps. This level of mapping is designed for use by landowners, townships and county natural resource planning and management.

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LOCAL / REGIONAL WATER AGENCY RECORDS

FEDERAL WATER WELLS

PWS: Public Water Systems Source: EPA/Office of Drinking Water Telephone: 202-564-3750 Public Water System data from the Federal Reporting Data System. A PWS is any water system which provides water to at least 25 people for at least 60 days annually. PWSs provide water from wells, rivers and other sources.

PWS ENF: Public Water Systems Violation and Enforcement Data Source: EPA/Office of Drinking Water Telephone: 202-564-3750 Violation and Enforcement data for Public Water Systems from the Safe Drinking Water Information System (SDWIS) after August 1995. Prior to August 1995, the data came from the Federal Reporting Data System (FRDS).

USGS Water Wells: USGS National Water Inventory System (NWIS) This database contains descriptive information on sites where the USGS collects or has collected data on surface water and/or groundwater. The groundwater data includes information on wells, springs, and other sources of groundwater.

STATE RECORDS

North Carolina Public Water Supply Wells Source: Department of Environmental Health Telephone: 919-715-3243

OTHER STATE DATABASE INFORMATION

NC Natural Areas: Significant Natural Heritage Areas Source: Center for Geographic Information and Analysis Telephone: 919-733-2090 A polygon converage identifying sites (terrestrial or aquatic that have particular biodiversity significance. A site’s significance may be due to the presenceof rare species, rare or hight quality natural communities, or other important ecological features.

NC Game Lands: Wildlife Resources Commission Game Lands Source: Center for Geographic Information and Analysis Telephone: 919-733-2090 All publicly owned game lands managed by the North Carolina Wildlife Resources Commission and as listed in Hunting and Fishing Maps.

NC Natural Heritage Sites: Natural Heritage Element Occurrence Sites Source: Center for Geographic Information and Analysis Telephone: 919-733-2090 A point coverage identifying locations of rare and endangered species, occurrences of exemplary or unique natural ecosystems (terrestrial or aquatic), and special animal habitats (e.g., colonial waterbird nesting sites).

RADON

State Database: NC Radon Source: Department of Environment & Natural Resources Telephone: 919-733-4984 Radon Statistical and Non Statiscal Data

Area Radon Information Source: USGS Telephone: 703-356-4020 The National Radon Database has been developed by the U.S. Environmental Protection Agency (USEPA) and is a compilation of the EPA/State Residential Radon Survey and the National Residential Radon Survey. The study covers the years 1986 - 1992. Where necessary data has been supplemented by information collected at private sources such as universities and research institutions.

TC4073890.1s Page PSGR-2 PHYSICAL SETTING SOURCE RECORDS SEARCHED

EPA Radon Zones Source: EPA Telephone: 703-356-4020 Sections 307 & 309 of IRAA directed EPA to list and identify areas of U.S. with the potential for elevated indoor radon levels.

OTHER

Airport Landing Facilities: Private and public use landing facilities Source: Federal Aviation Administration, 800-457-6656

Epicenters: World earthquake epicenters, Richter 5 or greater Source: Department of Commerce, National Oceanic and Atmospheric Administration

Earthquake Fault Lines: The fault lines displayed on EDR’s Topographic map are digitized quaternary faultlines, prepared in 1975 by the United State Geological Survey STREET AND ADDRESS INFORMATION

© 2010 Tele Atlas North America, Inc. All rights reserved. This material is proprietary and the subject of copyright protection and other intellectual property rights owned by or licensed to Tele Atlas North America, Inc. The use of this material is subject to the terms of a license agreement. You will be held liable for any unauthorized copying or disclosure of this material.

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