2018 Annual Landfill Inspection Report
Landfill
Conesville Plant AEP Generation Resources, Inc. Coshocton County, Ohio
December 2018
Prepared for: AEP Generation Resources – Conesville Plant Conesville, Ohio
Prepared by: American Electric Power Service Corporation 1 Riverside Plaza Columbus, OH 43215
Document ID: GERS-18-077
Table of Contents
1.0 Introduction ...... 4 2.0 Description of Landfill ...... 4 3.0 Review of Available Information ...... 4 4.0 Inspection ...... 4 4.1 Changes in Geometry since Last Inspection ...... 4 4.2 Volume ...... 4 4.3 Definitions of Observations and Deficiencies ...... 5 4.4 Visual Inspection ...... 6 4.5 Changes that Effect Stability or Operation ...... 7 5.0 Summary of Findings ...... 7 5.1 General Observations ...... 7 5.2 Maintenance Items ...... 7 5.3 Items to Monitor ...... 7 5.4 Deficiencies ...... 7
Appendices Appendix A – Site Map Appendix B – Inspection Photos
Pages 3 of 8
1.0 INTRODUCTION
This report was prepared by AEP- Geotechnical Engineering Services (GES) section, in part, to fulfill requirements of 40 CFR 257.84 and to provide the Conesville Plant an evaluation of the facility.
Brian Palmer performed the 2018 inspection of the Landfill at the Conesville Plant. This report is a summary of the inspection and an assessment of the general condition of the facility. Cyril Burkhart, Plant Landfill Supervisor was also present during the inspection. The inspection was performed on December 11, 2018. Weather conditions were sunny and the temperature was in the mid 30’s (°F). There was 0.12 inches of rain and 0.1 inches of snow recorded over the seven days prior to the inspection.
2.0 DESCRIPTION OF LANDFILL
The original landfill (PTI No. 06-1128) was approved by the State of Ohio in April 1985. The landfill was constructed from the center of the valley to the south ridge top and had a footprint of approximately 52 acres. The landfill included seven (7) operational phases (Sequence A, B, C, D, EFG-Phase I, EFG-Phase II, and HI). The original capacity was 3.63 million cubic yards.
In May 1993, a lateral and vertical expansion (PTI No. 06-3426) was approved by the State which increased the footprint by approximately 47 acres to the north and southeast. This expansion resulted in an additional 8.34 million cubic yards of capacity. The expansion area originally consisted of five operational phases (A, B, C, D and E). In February 2006, authorization was obtained to combine Phases D-E and A into a single operational phase (D-E-A).
In November 2006, a vertical expansion (PTI No. 06-07748) was approved by the State. The vertical expansion, designated Phase F, lies above portions of both original and the 1993 lateral expansion. The vertical expansion resulted in an additional 3.5 million cubic yards of capacity. Waste placement began in Phase F in June 2008.
In 2010, the currently active lateral expansion (PTI No. 06-08442), designated as Phase G, was approved. The lateral expansion provided an additional 5 million cubic yards of waste capacity. Phase G is being constructed on a combination of a new footprint and above portions of the 1993 lateral expansion Phases B, C, D and E and adjacent to the now completed Phase F vertical expansion.
The only open area of the landfill if Phase G. All other areas of the landfill have been closed with a final cover system as approved by Ohio EPA
The overall features of the landfill were categorized into the following components as a means of organizing the inspection and reporting: Active Landfill Disposal Area (Phase G) Inactive Landfill Areas (Phase G) Leachate Collection Ponds Storm Water Drainage Ditches Closed Areas
These features are shown on the Figure 1of Appendix A.
Pages 4 of 8
3.0 REVIEW OF AVAILABLE INFORMATION (257.84(b)(1)(i))
1. A review of available information regarding the status and condition of the Landfill which include files available in the operating record, such as design and construction information, previous 7 day inspection reports and previous annual inspections has been conducted. Based on the review of the data there were no signs of actual or potential structural weakness or adverse conditions. 2. The monthly flow measurements from ground water interceptor drains and leachate collection discharge pipes were also reviewed.
4.0 INSPECTION (257.84(b)(1)(ii))
4.1 CHANGES IN GEOMETRY SINCE LAST INSPECTION (257.84(b)(2)(i)) No modifications have been made to the geometry of the Landfill since the 2017 annual inspection. The geometry of the landfill has remained essential unchanged, except for the change in topography of the active disposal area.
4.2 VOLUME (257.84(b)(2)(ii))
The total volume of CCR disposed at the landfill as of the inspection date of was estimated to be 1,478,460 (1,477,290 end of 2017 + 1,170 (1463tons x 1cy/1.25 tons) to date) cubic yards. 4.3 DEFINITIONS OF VISUAL OBSERVATIONS AND DEFICIENCIES This summary of the visual observations uses terms to describe the general appearance or condition of an observed item, activity or structure. The meaning of these terms is as follows:
Good: A condition or activity that is generally better or slightly better than what is minimally expected or anticipated from a design or maintenance point of view.
Fair/Satisfactory: A condition or activity that generally meets what is minimally expected or anticipated from a design or maintenance point of view.
Poor: A condition or activity that is generally below what is minimally expected or anticipated from a design or maintenance point of view.
Minor: A reference to an observed item (e.g., erosion, seepage, vegetation, etc.) where the current maintenance condition is below what is normal or desired, but which is not currently causing concern from a structure safety or stability point of view.
Significant: A reference to an observed item (e.g. erosion, seepage, vegetation, etc.) where the current maintenance program has neglected to improve the condition. Usually, this refers to conditions that have been identified in the previous inspections, but have not
Excessive: A reference to an observed item (e.g., erosion, seepage, vegetation, etc.) where the current maintenance condition is above or worse than what is normal or desired, and which may have affected the ability of the observer to properly evaluate the
Pages 5 of 8
structure or particular area being observed or which may be a concern from a structure safety or stability point of view.
This document also uses the definition of a “deficiency” as referenced in the CCR rule section §257.84(b)(5) Inspection Requirements for CCR Landfills. This definition has been assembled using the CCR rule preamble as well as guidance from MSHA, “Qualifications for Impoundment Inspection” CI-31, 2004. These guidance documents further elaborate on the definition of deficiency. Items not defined by deficiency are considered maintenance or items to be monitored.
A “deficiency” is some evidence that a landfill has developed a problem that could impact the structural integrity of the landfill. There are four general categories of deficiencies. These four categories are described below:
1. Uncontrolled Seepage (Leachate Outbreak) Leachate outbreak is the uncontrolled release of leachate from the landfill. 2. Displacement of the Embankment Displacement of the embankment is large scale movement of part of the landfill or perimeter berm. Common signs of displacement are cracks, scraps, bulges, depressions, sinkholes and slides. 3. Blockage of Control Features Blockage of Control Features is the restriction of flow at spillways, culverts, or leachate pipes drains. 4. Erosion Erosion is the gradual movement of surface material by water, wind or ice. Erosion is considered a deficiency when it is more than a minor routine maintenance item.
4.4 VISUAL INSPECTION (257.84(b)(1)(ii)) A visual inspection of the Landfill was conducted to identify any signs of distress or malfunction of the landfill and appurtenant structures. Specific items inspected included all structural elements of the landfill perimeter berms, temporary and final covers, drainage features, leachate ponds, open cells, and appurtenances such as the leachate pipe outfalls etc.
Overall the facility is in good condition. The landfill is functioning as intended with no signs of potential structural weakness or conditions which are disrupting to the safe operation of the landfill. Inspection photos are included in Appendix B. Additional photos taken during the inspection can be made available upon request. Unsatisfactory items noted in the previous annual inspection report appeared to have been addressed during 2018.
Active Landfill Area 1. No ponding of surface water was observed on the surface. 2. There was minor rill erosion of the CCR material in the active area. 3. Storm water runoff from the active fill area is directed into the West Pond Settling Basin No. 1 or the East Pond Settling Basin No. 2 via fabriform lined ditches and conveyance piping. Inactive Landfill Disposal Areas 4. The inactive area of the landfill exhibited good conditions with an established vegetative cover.
Pages 6 of 8
Leachate Collection Ponds 5. Leachate from the active disposal area is conveyed to the West Pond Settling Basin No. 1 (Outfall 605) which discharges into West Pond Settling Basin No. 2 (Outfall 602). Leachate is also conveyed to the East Pond Settling Basin No. 1 (Outfalls 601, 603 and 604) prior to discharge. Leachate was flowing out of the pipes and the leachate effluent was clear. 6. The embankments for the West Pond Settling Basin No. 1, West Pond Settling Basin No. 2 and East Pond Settling Basin No. 1 appeared to be in good condition. No significant change was discernable for the minor sloughing observed in the West Pond Settling Basin No. 2. 7. The emergency spillway for the West Settling Basin No. 2 has experienced undermining and has cracked the concrete. 8. The discharge water from the outfall pipe from West Settling Basin No. 2 appeared to be flowing under the riprap. 9. The grouted riprap below the discharge pipe from the East Settling Basin has been eroded and undermined. Storm Water Drainage Ditches 10. The perimeter ditches were in excellent condition. The ditches are grassed lined and no scour or erosion was observed during the inspection. The catch inlet basins were clear of debris and free draining. 11. The fabriform-lined channels were observed to be in excellent condition. 12. The north end of the fabriform lined ditch on the east final bench has excess vegetation growing at the outlet end. Closed Areas/Slopes 13. The condition of these closed and covered slopes was good. There were no observed erosion gullies, sloughs, or other signs of movement of these areas. All areas had very well maintained and a well-established vegetative cover.
4.5 CHANGES THAT EFFECT STABILITY OR OPERATION (257.84(b)(2)(iv)) Based on interviews with plant personnel and field observations there were no changes to the Landfill since the last annual inspection that would affect the stability of the Landfill.
5.0 SUMMARY OF FINDINGS
5.1 GENERAL OBSERVATIONS The following general observations were identified during the visual inspection:
1) In general, the landfill is functioning as intended. All areas of the facility are in good condition. 2) The Plant is performing regular maintenance and inspections as required.
5.2 MAINTENANCE ITEMS The following specific maintenance items were identified during the visual inspection.
1. Vegetation needs removed from the mid-slope fabriform ditch on the east side final cover.
Pages 7 of 8
2. The grouted riprap at the outfall of the East Settling Basins has been undermined and needs to be repaired 3. Riprap at the at the outlet from West Settling Basin #2 and from the West Treatment Pond appear to have minor undermining that needs further evaluated and repaired. 4. Concrete on the West Settling Basin #2 emergency spillway needs repaired
5.3 ITEMS TO MONITOR
No specific issues or areas were identified during the visual inspection as items to be monitored.
5.4 DEFICIENCIES (257.84(b)(2)(iii))
There were no signs of structural weakness or disruptive conditions that were observed at the time of the inspection that would require immediate additional investigation or remedial action.
There is, however, a noted deficiency pertaining to Outfall 603. The deficiency related to reduced flow from leachate outfall 603, identified as part of regular monitoring and inspections, repair options have been evaluated over the last year, plan developed and a contract issued, and repairs will be implemented in the spring 2019.
Pages 8 of 8
Appendix A
Site Map
Appendix B
Inspection Photos
AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 1 Description: Active Area
Notes: General condition of west side of active area in Phase G
Location:
N40 11.747 W81 50.223
Photo #: 2 Description: Active Area
Notes: General condition of west side of active area in Phase G
Location:
N40 11.783 W81 50.242
Page: 01 AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 3 Description: Active Area
Notes: General condition of bermed dump area in Phase G
Location:
N40 11.826 W81 50.199
Photo #: 4 Description: Active Area
Notes: General condition of of east side of Phase G
Location:
N40 11.807 W81 50.127
Page: 02 AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 5 Description: Other
Notes: General condition of protective cover over inactive area of Phase G
Location:
N40 11.884 W81 50.183
Photo #: 6 Description: Ditch
Notes: General condition of north perimeter fabriform ditch.
Location:
N40 11.887 W81 50.184
Page: 03 AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 7 Description: Final Cover
Notes: General condition of of final cover area adjacent to Phase G
Location:
N40 11.793 W81 50.141
Photo #: 8 Description: Final Cover
Notes: General condition of final cover in portion of Phase G
Location:
N40 11.810 W81 50.323
Page: 04 AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 9 Description: Road
Notes: General condition of west haul road
Location:
N40 11.812 W81 50.327
Photo #: 10 Description: Road
Notes: General condition of southeast perimeter road
Location:
Page: 05 AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 11 Description: Ditch
Notes: General condition of of fabriform ditch on the east side of Phase G
Location:
N40 11.811 W81 49.969
Photo #: 12 Description: Active Area
Notes: General condition of slope on east side of Phase G. Waste below final grades seeded to reduce erosion
Location:
N40 11.806 W81 49.967
Page: 06 AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 13 Description: Settling Basin
Notes: General condition of East Settling Basin (north)
Location:
N40 11.758 W81 49.812
Photo #: 14 Description: Settling Basin
Notes: General condition of East Settling Basin (south)
Location:
N40 11.724 W81 49.907
Page: 07 AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 15 Description: —
Notes: 603 leachate line discharge pipe
Location:
N40 11.723 W81 49.903
Photo #: 16 Description: —
Notes: 604 leachate line discharge pipe
Location:
N40 11.742 W81 49.912
Page: 08 AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 17 Description: Other
Notes: East Settling treatment pond
Location:
N40 11.724 W81 49.793
Photo #: 18 Description: Other
Notes: East Settling Basin outlet channel
Location:
N40 11.707 W81 49.792
Page: 09 AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 19 Description: Culvert
Notes: East Settling basin outlet pipe grouted riprap splash pad is undermined
Location:
N40 11.716 W81 49.797
Photo #: 20 Description: Settling Basin
Notes: General condition of East Settling Basin emergency spillway
Location:
N40 11.745 W81 49.802
Page: 10 AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 21 Description: Settling Basin
Notes: 601leachate line discharge pipe
Location:
N40 11.715 W81 49.895
Photo #: 22 Description: Settling Basin
Notes: East Settling Basin discharge structure
Location:
Page: 11 AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 23 Description: Final Cover
Notes: General condition of East slope final cover
Location:
N40 11.603 W81 49.820
Photo #: 24 Description: Ditch
Notes: General condition of perimeter fabriform ditch
Location:
N40 11.595 W81 49.820
Page: 12 AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 25 Description: Ditch
Notes: General condition of east side perimeter channel with rip rap bottom
Location:
N40 11.597 W81 49.823
Photo #: 26 Description: Final Cover
Notes: General condition of lower south side final cover
Location:
N40 11.395 W81 50.038
Page: 13 AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 27 Description: Final Cover
Notes: General condition of east slope final cover
Location:
N40 11.521 W81 50.044
Photo #: 28 Description: Final Cover
Notes: General condition of top final cover
Location:
N40 11.523 W81 50.050
Page: 14 AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 29 Description: Final Cover
Notes: General condition of top final cover
Location:
N40 11.652 W81 50.089
Photo #: 30 Description: Final Cover
Notes: General condition of east slope final cover
Location:
N40 11.656 W81 50.065
Page: 15 AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 31 Description: Final Cover
Notes: General condition of north slope final cover
Location:
N40 11.667 W81 50.102
Photo #: 32 Description: Final Cover
Notes: General condition of top final cover
Location:
N40 11.605 W81 50.253
Page: 16 AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 33 Description: Final Cover
Notes: General condition of west slope final cover
Location:
Photo #: 34 Description: Final Cover
Notes: General condition of south slope final cover
Location:
N40 11.560 W81 50.314
Page: 17 AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 35 Description: Final Cover
Notes: General condition of east bench
Location:
N40 11.529 W81 49.979
Photo #: 36 Description: Final Cover
Notes: General condition of east final cover
Location:
N40 11.585 W81 49.915
Page: 18 AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 37 Description: Culvert
Notes: East Bench discharge pipe. Need to remove trees
Location:
N40 11.718 W81 50.022
Photo #: 38 Description: Culvert
Notes: East Bench discharge pipe.
Location:
N40 11.721 W81 50.023
Page: 19 AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 39 Description: Final Cover
Notes: General condition of west side final cover
Location:
N40 11.694 W81 50.319
Photo #: 40 Description: Final Cover
Notes: General condition of west side final cover
Location:
N40 11.667 W81 50.359
Page: 20 AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 41 Description: —
Notes: General condition of West Setting Basin #1
Location:
N40 11.695 W81 50.373
Photo #: 42 Description: —
Notes: 605 leachate line & storm water discharge into West Settling Basin #1
Location:
N40 11.716 W81 50.376
Page: 21 AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 43 Description: Other
Notes:
Location:
N40 11.686 W81 50.398
Photo #: 44 Description: Other
Notes: Outlet structure from West Settling Basin #1
Location:
N40 11.683 W81 50.428
Page: 22 AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 45 Description: Other
Notes: General condition of West Settling Basin #2
Location:
N40 11.662 W81 50.458
Photo #: 46 Description: Other
Notes: Discharge of 602 leachate line into West Settling Basin #2.
Location:
N40 11.662 W81 50.464
Page: 23 AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 47 Description: Other
Notes: West Settling Basin #2 outlet structure
Location:
N40 11.647 W81 50.525
Photo #: 48 Description: Other
Notes: West Settling Basin #2 outlet discharge. A significant portion of flow appeared to be flowing under riprap.
Location:
N40 11.646 W81 50.521
Page: 24 AEP GES Landfill Inspection
Plant Name: Conesville Inspector: B Palmer
Unit: Landfill Date: December 11, 2018
Photo #: 49 Description: Other
Notes: West Settling Basin #3 outlet structure
Location:
N40 11.637 W81 50.507
Photo #: 50 Description: Other
Notes: West Settling Basins outlet channel
Location:
N40 11.629 W81 50.507
Page: 25