HomeMy WebLinkAboutIdentification of New Discharges PlanPlan for Identification of New Discharges September 2014
W.H. Weatherspoon Power Plant SynTerra
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TABLE OF CONTENTS
SECTION PAGE
1.0 Introduction ..................................................................................................................... 1
2.0 Site Description ............................................................................................................... 3
2.1 Plant Description ........................................................................................................ 3
2.2 Ash Basin Description ............................................................................................... 3
3.0 Site Geology and Hydrogeology .................................................................................. 4
3.1 Site Geologic/Soil Framework .................................................................................. 4
3.2 Site Hydrogeologic Framework ............................................................................... 4
4.0 Identification of New Discharges ................................................................................ 5
4.1 Purpose of Inspection ................................................................................................ 5
4.2 Seepage ........................................................................................................................ 5
4.3 Area to be Inspected for New Discharges .............................................................. 5
4.4 Inspection Procedure ................................................................................................. 5
5.0 References ......................................................................................................................... 6
List of Figures
Figure 1 – Site Location Map
Figure 2 – Areas to be Inspected for Seeps
List of Appendices
Appendix A – Inspection for Identification of New Discharges
Plan for Identification of New Discharges September 2014
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1.0 INTRODUCTION
The purpose of this document is to address the requirements of North Carolina General
Statute (GS)130A-309.210 (d) Identification and assessment of discharges; correction of
unpermitted discharges, as modified by North Carolina Senate Bill 729, for the W. H.
Weatherspoon Power Plant (Weatherspoon) ash basin operated under National
Pollution Discharge Elimination System (NPDES) Permit NC005363.
The following requirements are contained in General statue 130A-309.210:
d) Identification of New Discharges. – No later than October 1, 2014, the owner of a coal
combustion residuals surface impoundment shall submit a proposed Plan for the
Identification of New Discharges to the Department for its review and approval as
provided in this subsection.
(1) The proposed Plan for the Identification of New Discharges shall include, at a
minimum, all of the following:
a. A procedure for routine inspection of the coal combustion residuals surface
impoundment to identify indicators of potential new discharges, including
toe drain outfalls, seeps, and weeps.
b. A procedure for determining whether a new discharge is actually present.
c. A procedure for notifying the Department when a new discharge is
confirmed.
d. Any other information related to the identification of new discharges
required by the Department.
(2) The Department shall approve the Plan for the Identification of New Discharges if
it determines that the Plan complies with the requirements of this subsection and
will be sufficient to protect public health, safety, and welfare; the environment;
and natural resources.
(3) No later than 30 days from the approval of the Plan for the Identification of New
Discharges, the owner shall begin implementation of the Plan in accordance with
the Plan.
The North Carolina Senate Bill 729 establishes the submittal date of this Plan for
Identification of New Discharges no later than October 1, 2014.
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This bill also modified GS 130A to establish the following submittals that are related to
this Plan. GS130A-309.210(a) was modified to require:
(2) No later than December 31, 2014, the owner of a coal combustion residuals surface
impoundment shall submit a topographic map that identifies the location of all (i) outfalls
from engineered channels designed or improved for the purpose of collecting water from the
toe of the impoundment and (ii) seeps and weeps discharging from the impoundment that are
not captured by engineered channels designed or improved for the purpose of collecting
water from the toe of the impoundment to the Department. The topographic map shall comply
with all of the following:
a. Be at a scale as required by the Department.
b. Specify the latitude and longitude of each toe drain outfall, seep, and weep.
c. Specify whether the discharge from each toe drain outfall, seep, and weep
is continuous or intermittent.
d. Provide an average flow measurement of the discharge from each toe drain
outfall, seep, and weep including a description of the method used to
measure average flow.
e. Specify whether the discharge from each toe drain outfall, seep, and weep
identified reaches the surface waters of the State. If the discharge from a
toe drain outfall, seep, or weep reaches the surface waters of the State, the
map shall specify the latitude and longitude of where the discharge reaches
the surface waters of the State.
f. Include any other information related to the topographic map required by
the Department.
The inspection procedures presented in this plan, developed to satisfy the requirements
of GS130A-309.210(d), will be used as the basis for developing the topographic map
required by GS130A-309.210(a)(2).
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2.0 SITE DESCRIPTION
2.1 Plant Description
Duke Energy Progress, Inc. (Duke Energy) owns and operates the Weatherspoon Plant,
a former coal-fired electricity-generating facility located in Robeson County, North
Carolina, near the city of Lumberton. The location of the plant is shown on Figure 1.
The Weatherspoon Plant started operations in 1949. Two additional units were added
in the 1950s. Four oil and natural gas fueled combustion turbines were added in the
1970s.
As of October 2011, all of the coal-fired units were retired. The four oil and natural gas
units continue to operate to meet peak demand. The facility is located southeast of
Lumberton on the east side of North Carolina Highway 72. The topography around the
property generally slopes downward toward the Lumber River.
The Weatherspoon Plant utilizes an approximate 225-acre cooling pond located adjacent
to the Lumber River. The ash basin is located north of the cooling pond, northeast of
the power plant, as shown on Figure 2.
2.2 Ash Basin Description
The power plant, cooling pond, and ash basin are located on the east side of the Lumber
River. The ash basin is located north of the cooling pond, northeast of the power plant,
as shown on Figure 2. The ash basin consists of an approximate 65 acre ash basin. The
500 foot compliance boundary circles the ash basin.
The ash basin is impounded by an earthen dike. Ash generated from coal combustion
was stored on-site in the ash basin. Overflow from the ash basin drains to the northeast
corner of the cooling pond. The Weatherspoon Plant NPDES permit (NC005363)
authorizes the discharge of recirculated cooling water, ash sluice water, domestic
wastewater, chemical metal cleaning water, and low volume wastewater including
reject water from a reverse osmosis treatment water treatment unit from the cooling
pond via Outfall 001 to the Lumber River under severe weather conditions and pond
maintenance.
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3.0 SITE GEOLOGY AND HYDROGEOLOGY
3.1 Site Geologic/Soil Framework
Geographically, the Weatherspoon Plant lies within the Coastal Plain Physiographic
Province (Geologic Map of North Carolina, 1985).
The North Carolina Coastal Plain is approximately 90 to 150 miles wide from the
Atlantic Ocean westward to its boundary with the Piedmont province (Winner, Jr. and
Coble, 1989). Two natural subdivisions of the Coastal Plain were described by Stuckey
(1965): the Tidewater region and the Inner Coastal Plain. The Weatherspoon Plant is
located within the Inner Coastal Plain, which consists of the gently rolling land surface
between the Tidewater region and the Fall Line (Winner, Jr. and Coble, 1989). The
Weatherspoon Plant is located within a subdivision of the Inner Coastal Plain that is
typified by swampy areas in the flat uplands between major river systems. The
Weatherspoon Plant is located on the east side of the Lumber River.
Based on monitoring well logs, the surficial aquifer at the Weatherspoon Plant consists
generally of gray, fine and medium grained sand, intermixed with clay and silt across
the well screens. The boring logs do not indicate that the Peedee confining unit was
encountered during drilling activities; however, the maximum depth of the compliance
wells at the Weatherspoon Plant is approximately 20 feet below ground surface.
3.2 Site Hydrogeologic Framework
In the Robeson County part of the North Carolina Coastal Plain, groundwater is
obtained from the surficial, Peedee, Yorktown, and Black Creek aquifers. The Coastal
Plain groundwater system consists of aquifers comprised of permeable sands, gravels,
and limestone separated by confining units of less permeable sediment.
The surface of groundwater at the Weatherspoon Plant is typically located at depths of
4 to 8 feet below ground surface, depending on precipitation and topography. Based on
the results of work conducted at the Plant, the transmissivity for the surficial aquifer
ranges between approximately 400 and 1,750 ft2/day. Water level maps for the site
indicate the general direction of groundwater flow appears to be southeast from the ash
basin.
The average precipitation in the Lumberton, NC area is approximately 48 inches per
year. Due to the relatively high transmissivity characteristic of the surficial aquifer,
recharge rates are expected to be high.
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4.0 IDENTIFICATION OF NEW DISCHARGES
4.1 Purpose of Inspection
The purpose of the inspection is to identify new discharges and indicators or potential
new discharges, including toe drain outfalls, seeps, and weeps associated with the coal
combustion residuals surface impoundments (ash basins).
4.2 Seepage
Seepage is considered to be the movement of wastewater from the ash basin through
the ash basin embankment, the embankment foundation, the embankment abutments,
or through residual material in areas adjacent to the ash basin. A seep is defined in this
document as an expression of seepage at the ground surface. A weep is understood to
have the same meaning as a seep.
Indicators of seepage include areas where water is observed on the ground surface
and/or where vegetation suggests the presence of seepage. Seepage can emerge
anywhere on the downstream face, beyond the toe, or on the downstream abutments at
elevations below normal pool. Seepage may vary in appearance from a "soft," wet area
to a flowing "spring." Seepage may show up first as only an area where the vegetation
is lusher and darker green than surrounding vegetation. Cattails, reeds, mosses, and
other marsh vegetation often become established in a seepage area (NCDENR, 1985).
However, in many instances, indicators of seeps do not necessarily indicate the
presence of seeps.
4.3 Area to be Inspected for New Discharges
The areas to be inspected are the areas of the site where water contained in the ash basin
might infiltrate into the underlying residual material and be expressed as seepage. The
extent of the areas to be inspected was determined based on the site topography,
surface water drainage features around the ash basin, and proximity to the cooling
pond. At the Weatherspoon Plant, flow of water from the ash basin would be radial.
The areas to be inspected are shown on Figure 2.
4.4 Inspection Procedure
The inspection procedure for identification of new discharges and indicators of
potential new discharges associated with the Weatherspoon Plant ash basin is provided
in Appendix A. In addition to the specific requirements for the inspection, Appendix A
also provides the general requirements, the frequency of inspections, documentation
requirements, and provides a decision flow chart for determining if the potential new
discharge is associated with the ash basin.
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5.0 REFERENCES
NCDENR, “Dam Operation, Maintenance, and Inspection Manual”, 1985 (Revised
2007).
North Carolina Geological Survey, 1985, Geologic map of North Carolina: North Carolina
Geological Survey, General Geologic Map, scale 1:500,000.
Stuckey, J.L., 1965, North Carolina: Its Geology and Mineral Resources, Raleigh, North
Carolina Department of Conservation and Development, 550p.
Winner, M.D., Jr., and Coble, R.W., 1989, Hydrogeologic Framework of the North
Carolina Coastal Plain Aquifer System: U.S. Geological Survey Open-File
Report.
FIGURES
PROJECT MANAGER:
LAYOUT:
DRAWN BY:
KATHY WEBB
DATE:S. ARLEDGE
FIG 1 (USGS SITE LOCATION)
2014-09-26
FIGURE 1
SITE LOCATION MAP
WEATHERSPOON POWER PLANT
491 POWER PLANT RD
LUMBERTON, NORTH CAROLINA
SOUTH EAST LUMBERTON, NC QUADRANGLE
2000
GRAPHIC SCALE
1000
IN FEET
10000CONTOUR INTERVAL:
MAP DATE:
10 FEET
1993
148 RIVER STREET, SUITE 220
GREENVILLE, SOUTH CAROLINA
PHONE 864-421-9999
www.synterracorp.com
SOURCE:
USGS TOPOGRAPHIC MAP OBTAINED FROM THE NRCS GEOSPATIAL DATA
GATEWAY AT http://datagateway.nrcs.usda.gov/
RALEIGH
WILMINGTON
GREENVILLE
GREENSBORO
PROPERTY BOUNDARY
500' COMPLIANCE
BOUNDARY
WASTE
BOUNDARY
WEATHERSPOON
POWER PLANT
ROBESON
COUNTY
3000300600GRAPHIC SCALEIN FEETFIG 2 (SEEP INSPECTION AREA)2014-09-26H. FRANKS. ARLEDGEPROJECT MANAGER:LAYOUT NAME:DRAWN BY:CHECKED BY:K. WEBBDATE:DATE:FIGURE 2AREAS TO BEINSPECTED FOR SEEPSwww.synterracorp.com148 River Street, Suite 220Greenville, South Carolina 29601864-421-9999LEGEND2014-09-26500 ft COMPLIANCE BOUNDARYDUKE ENERGY PROGRESSWEATHERSPOON PLANTWASTE BOUNDARYWEATHERSPOON POWER PLANT491 POWER PLANT RDLUMBERTON, NORTH CAROLINABOUNDARY OF AREA TO BEINSPECTED FOR SEEPSFLOW DIRECTIONNPDES OUTFALL LOCATIONCW-3ASH BASIN COMPLIANCE GROUNDWATERMONITORING WELL2007 LiDAR CONTOUR MAJOR2007 LiDAR CONTOUR MINOR120BERRY STTOMMY DRB
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ASH BASINLUMBER RIVERCOOLING PONDLUMBER RIVERPOWER PLANT RDS ROBERTS AVE (NC HWY 72)LUMBER RIVERHAVALIH DRCREEKWOOD RDDRAINAGE DITCHDRAINAGE DITCHFORMERASH PIPEASH PONDOVERFLOWTOE DRAINSCULVERTCOLLECTION BASIN(LEFT & RIGHT PIPES)CW-3CW-2CW-1BW-1J
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SOURCES:1.2010 HIGH RESOLUTION AERIAL PHOTOGRAPHS AND1997 WATER LINES OBTAINED FROM NC ONE MAP AThttp://data.nconemap.com/geoportal/catalog/raster/download.page2.2014 AERIAL PHOTOGRAPH WAS OBTAINED FROM WSPFLOWN ON APRIL 17, 2014.3.DRAWING HAS BEEN SET WITH A PROJECTION OFNORTH CAROLINA STATE PLANE COORDINATE SYSTEMFIPS 3200 (NAD 83).4.2ft CONTOUR INTERVALS FROM NCDOT LIDAR DATED2007https://connect.ncdot.gov/resources/gis/pages/cont-elev_v2.aspxNOTE:1.CONTOUR LINES ARE USED FOR REPRESENTATIVEPURPOSES ONLY AND ARE NOT TO BE USED FORDESIGN OR CONSTRUCTION PURPOSES.
APPENDIX A
INSPECTION FOR IDENTIFICATION
OF NEW DISCHARGES
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1. Purpose of Inspection
The purpose of the inspection is to identify new discharges and indicators of potential new
discharges, including toe drain outfalls, seeps, and weeps that arise after the initial submittal of
maps required by North Carolina General Statute 130A‐309.210(a)(2)(ii). Seepage is considered
to be the movement of wastewater from the ash basin through the ash basin embankment, the
embankment foundation, the embankment abutments, or through residual material in areas
adjacent to the ash basin. Therefore, a seep is defined in this document as an expression or
occurrence of potential wastewater at the ground surface. A weep is understood to have the
same meaning as a seep. If new discharges or indicators of potential new discharges are
identified, the decision flow chart (see Figure A‐1) will be used to determine if the potential new
discharge is from the ash basin and if notification to the North Carolina Department of
Environment and Natural Resources (NCDENR) Division of Water Resources (DWR) is
required.
2. General Inspection Requirements
2.1. Inspections are to be performed on areas that are below the ash basin full pond
elevation and within the area shown on Figure A‐2. The scope of the inspections
includes identification of seeps from residual ground and outfalls from engineered
channels.
2.2. If required, a larger scale figure showing the locations of outfalls from engineered
channels will be developed. If a separate figure showing outfalls from engineered
channels is not developed, Figure A‐2 will be revised to show these features.
2.3. Inspections of areas on or adjacent to the ash basin embankments should be performed
within two months after mowing, if possible.
2.4. Inspections should not be performed if the following precipitation amounts have
occurred in the respective time period preceding the planned inspection:
2.4.1. Precipitation of 0.1 inches or greater within 72 hours, or
2.4.2. Precipitation of 0.5 inches or greater within 96 hours.
2.5. Record most recent ash basin water surface elevation.
2.6. Review previous inspections for new discharges prior to performing inspection.
2.7. Review the most recent previous dam inspections.
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2.8. Conduct an interview with the Site Environmental Coordinator prior to performing
inspection to inquire about possible changes to site conditions, such as pond elevations,
operations, additions or removal of wastewater discharges to the ash basin, changes to
site surface water drainage, etc.
3. Frequency of Inspections
Inspections will be performed on a semi‐annual basis during the first quarter of the year
(January to March representative of seasonal high precipitation and while vegetation is
dormant) and during the third quarter (July to September representative of seasonal low
precipitation and vegetative growth).
4. Qualifications
The inspections shall be performed under the direction of a qualified Professional Engineer or
Professional Geologist.
5. Documentation of Inspection
The inspection shall be documented by the individual performing the inspection. The report
should contain observations and descriptions of the seeps observed, changes in observations
compared to previous inspections, estimates of flows quantities, and photographs of seeps and
outfalls of engineered channels designed or improved for collecting water from the
impoundment. Photographs are to be numbered and captioned.
6. Initial Inspection
An initial inspection should be performed to identify features and document baseline
conditions including location, extent (i.e., dimensions of affected area), and flow. Seep locations
should be recorded using a Global Positioning System (GPS) device. Photographs should be
taken from vantage points that can be replicated during subsequent semi‐annual inspections.
7. Inspection For New Seeps at Outfalls From Engineered Outfalls
Inspect the outfalls from engineered channels designed and/or improved (such as through the
placement of rip‐rap) associated with the ash basin dikes to identify new seeps or indicators of
new seeps.
7.1. Inspect all outfalls from engineered channels designed and/or improved (such as
through the placement of rip‐rap).
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7.2. Document the condition of the outfall of the engineered channel with photographs.
Photographs are to be taken from a similar direction and scale as the original
photographs taken during the initial inspection.
7.3. Observe outfall for seepage and for indicators of seeps.
7.4. Compare current seepage location, extent, and flow to seepage photographs and
descriptions from previous inspections.
7.5. Record flow rate if measureable.
8. Inspection For New Seeps Not Captured by Engineered Channels
Inspect areas below the ash basin full pond elevation and within the boundary of the area to be
inspected as shown on Figure A‐2 to identify new seeps or indicators of new seeps. Inspect
topographic drainage features that potentially could contain new seeps that potentially
discharge from the ash basin. Requirements for documentation of the inspection are found in
Section 5.
8.1. Previously Identified Seeps
a) Inspect previously identified seep locations. Document the condition of the seeps
with a photograph. Photographs are to be taken from similar direction and at a
similar scale as the original photograph documenting the seep. Describe the
approximate dimensions and flow conditions of the seep.
b) If measureable, record flow.
c) Observe seep to determine if changes to location, extent, of flow are present.
Document changes to location, extent, and/or flow amount or pattern.
8.2. New Seep or Indicators of Seep
a) Mark the location of new seep or indicators of seep using a GPS device.
b) Document the condition of the seeps or indicators of seeps with a photograph.
c) Describe the approximate dimensions and flow conditions of the seep.
d) Map the location of new seep or indicator of seep using GPS coordinate points
collected during the site visit.
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e) If seep or indicator of seep was not caused by changes in surface water drainage and
if the location is below the ash basin pond elevation, utilize the decision flow chart to
determine if the seep represents a discharge from the ash basin and if notification to
DWR is required.
9. Update Maps Identifying Seeps
If new seeps are identified during the inspection, Figure A‐2 shall be updated to show the
location of the new seeps.
10. Decision Flow Chart
The decision flow chart developed to determine whether a new seep discharges from the ash
basin is found in Figure A‐1.
11. Procedure for Notifying NCDENR DWR If New Discharge Is Confirmed
If it is determined that a newly identified seep is present, Duke Energy will notify the DWR
regional office by mail within 14 days after the determination.
Figure A‐1 Decision Flow Chart for Determining If New Seep Represents Discharge From the Ash Basin LocationsDuke Energy Progress, North CarolinaIs new seep located below elevation of ash basin?New seep is not related to ash basinIs new seep located within the boundary of area to be inspected for seeps as shown on Figure A‐2?New seep is not hydraulically related to ash basinDoes new seep present concentrated flow that could be collected, measured and sampled?New seep presents diffuse flow conditions. Photograph, map location; add to seep location map, describe flow conditions, and approximate area of seepage. Collect water quality sample at seep and perform the following analyses:Field parameters: pH, specific conductance, temperature, etc. Constituent analyses: NPDES parameters, plus major cations and anionsCompare analytical results from seep to relevant ash basin and groundwater sampling results to determine if analytical results from new seep indicate discharge from the ash basinDo analytical results from new seep indicate discharge from ash basin?Prepare report documenting inspection and evaluation. Notify DWR that new seep identified and based on above evaluation, the new seep represents discharge from ash basin.Prepare report documenting inspection and evaluation. Notify DWR that new seep was identified; however new seep does not represent discharge from ash basin.Review previous seep inspection reportsPerform inspection for new seepsNoNoNoNoYesYesYesYesNotes:1. If no new seeps are identified, inspection will be documented however no notification to NCDENR DWR is required.2. If new seeps are identified that do not represent discharge from the ash basin during the same inspection that identifies new seeps that do represent a discharge from the ash basin, a single report will be submitted to NCDENR DWR.
3000300600GRAPHIC SCALEIN FEETFIG A-2 (SEEP INSPECTION AREA)2014-09-26H. FRANKS. ARLEDGEPROJECT MANAGER:LAYOUT NAME:DRAWN BY:CHECKED BY:K. WEBBDATE:DATE:FIGURE A-2AREAS TO BEINSPECTED FOR SEEPSwww.synterracorp.com148 River Street, Suite 220Greenville, South Carolina 29601864-421-9999LEGEND2014-09-26500 ft COMPLIANCE BOUNDARYDUKE ENERGY PROGRESSWEATHERSPOON PLANTWASTE BOUNDARYWEATHERSPOON POWER PLANT491 POWER PLANT RDLUMBERTON, NORTH CAROLINABOUNDARY OF AREA TO BEINSPECTED FOR SEEPSFLOW DIRECTIONNPDES OUTFALL LOCATIONCW-3ASH BASIN COMPLIANCE GROUNDWATERMONITORING WELL2007 LiDAR CONTOUR MAJOR2007 LiDAR CONTOUR MINOR120BERRY STTOMMY DRB
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ASH BASINLUMBER RIVERCOOLING PONDLUMBER RIVERPOWER PLANT RDS ROBERTS AVE (NC HWY 72)LUMBER RIVERHAVALIH DRCREEKWOOD RDDRAINAGE DITCHDRAINAGE DITCHFORMERASH PIPEASH PONDOVERFLOWTOE DRAINSCULVERTCOLLECTION BASIN(LEFT & RIGHT PIPES)CW-3CW-2CW-1BW-1J
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SOURCES:1.2010 HIGH RESOLUTION AERIAL PHOTOGRAPHS AND1997 WATER LINES OBTAINED FROM NC ONE MAP AThttp://data.nconemap.com/geoportal/catalog/raster/download.page2.2014 AERIAL PHOTOGRAPH WAS OBTAINED FROM WSPFLOWN ON APRIL 17, 2014.3.DRAWING HAS BEEN SET WITH A PROJECTION OFNORTH CAROLINA STATE PLANE COORDINATE SYSTEMFIPS 3200 (NAD 83).4.2ft CONTOUR INTERVALS FROM NCDOT LIDAR DATED2007https://connect.ncdot.gov/resources/gis/pages/cont-elev_v2.aspxNOTE:1.CONTOUR LINES ARE USED FOR REPRESENTATIVEPURPOSES ONLY AND ARE NOT TO BE USED FORDESIGN OR CONSTRUCTION PURPOSES.