3001_Davie_MSW_RequestWellAbandonmentReplacement_DIN27839_20170524

S&ME, Inc. | 8646 W Market St, Ste 105 | Greensboro, NC 27409 | p 336.288.7180 | f 336.288.8980 | www.smeinc.com
May 24, 2017
NCDEQ-DWM, Solid Waste Section
1646 Mail Service Center
Raleigh, North Carolina 27699
Attention:Mrs. Elizabeth Werner
Reference:Well Abandonment & Well Replacement Request
Davie County Landfill
Mocksville, North Carolina
S&ME Project No. 1584-03-109A
Dear Mrs. Werner:
The Davie County, Construction and Demolition (C&D) landfill operated under Permit No. 30-03 was
closed in 2003 whereas, the Municipal Solid Waste (MSW) landfill units operated under Permit No. 30-01
were closed in 1994. S&ME Inc. (S&ME) and Grey Engineering are the team providing Davie County with
post-closure care monitoring for these landfills. Based on post-closure care compliance monitoring data,
Nature and Extent groundwater investigations were initiated in 2003, the scope of the investigations was
expanded in 2010, and investigations are on-going. Several additional monitoring wells installed as part
of these investigations replaced certain historic compliance monitoring wells that were not well suited to
the compliance monitoring program. Davie County made a request to the North Carolina Department of
Environmental Quality, Division of Waste Management, Solid Waste Section (NCDEQ) to modify the
facility’s Water Quality Monitoring Plan, and received approval from NCDEQ on October 6, 2017.
S&ME and Grey Engineering have been closely monitoring the post-closure groundwater analytical data
obtained following the approved modification of the Water Quality Monitoring Plan. Considering that
monitoring wells MW-1, MW-8, MW-10, and MW-12 are no longer part of the post-closure landfill
monitoring program and an evaluation of the post-closure groundwater analytical data set, it was
determined that these monitoring wells are not considered significant assets for future groundwater
monitoring. Proper abandonment of these monitoring wells removes the burden of maintaining wells
that are not essential to post-closure care. Therefore, on behalf of Davie County S&ME requests approval
to properly abandon these monitoring wells. The following provides additional details to support this
request.
MSW Landfill (Permit No. 30-01)
♦Monitor well MW-1 is located in close proximity of the toe of the limits of waste. It was removed
from the post-closure monitoring program in 2011 and replaced by monitoring well MW-21.
Groundwater analytical results for samples obtained from MW-21 indicate compliance with 15A
NCAC 2L groundwater quality standards (2L Standards).
Well Abandonment & Well Replacement Request
Davie County Landfill
Mocksville, North Carolina
S&ME Project No. 1584-03-109A
May 24, 2017 2
C&D Landfill (Permit No. 30-03)
♦Monitor well MW-8 is located beyond (outside of) the Compliance Boundary. It was removed
from the post-closure monitoring program in 2011 and replaced with monitoring well MW-8A.
♦Monitor well MW-10 is located in close proximity of the limits of waste. It was removed from
post-closure monitoring in 2011 and replaced with monitor well MW-20. Groundwater analytical
results for samples obtained from MW-20 indicate compliance with 2L Standards.
♦Monitor well MW-12 is located between the MSW and C&D landfill units, near the limits of waste,
and in an area characterized by overlapping Compliance Boundaries. It was removed from the
post-closure monitoring program in 2011.
Lastly, compliance monitoring well MW-2B likely dates back to the original permitting of the MSW landfill
in the 1980’s. Well construction records for this well have not been located. As indicated in the attached
photograph, large trees have overgrown the well location and removal of the trees may create well
integrity concerns. S&ME weighed the options to bring monitoring well MW-2B up to the current 15A
NCAC 2C standards and we believe the best option is to abandon and replace it with new well. It should
be noted that the replacement monitoring well cannot be located further east without further risk of that
the well will monitor groundwater stemming from the Pre-Regulatory Landfill units located immediately
to the east. Attached is a diagram depicting proposed construction details for the replacement well to be
named MW-2C. Following installation, the well will be developed and slug testing conducted to estimate
hydraulic conductivity of the monitored portion of the aquifer. A Well Construction Record, well boring
log, and slug test results will be provided to you within 30 days of well completion.
Figure 1 depicts the limits of waste for the permitted landfill units, the location of existing monitoring
wells, the location of wells to be abandoned, and the proposed location for MW-2C.
Please contact me should you need additional details to complete your review of these requests. If
possible, we would like to implement the requested items during the next few months.
Sincerely,
S&ME, Inc.
Edmund Q.B. Henriques, L.G.
Project Manager / Senior Geologist
Figure 1 – Monitoring Well Network
Photograph of Monitoring Well MW-2B
Proposed Well Construction Diagram – MW-2C
Attachments
Attachment I – Figure 1
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JOB NO.
SCALE:
DATE:
DRAWN BY:CHECKED BY:
FIGURE NO.
3718 OLD BATTLEGROUND ROAD
GREENSBORO, NC. 27410
PH. 336-288-7180
FAX. [phone]
DRAWING PATH:
MONITORING WELL NETWORK
DAVIE COUNTY LANDFILL
DAVIE COUNTY NORTH CAROLINA
AS SHOWN RDM EQBH
1584-03-109 MAY 2017 1
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Attachment II – Photograph of MW-2B
Davie County Landfill
Project #: 1584-03-109A
Sheet 1 of 1
8646 West Market Street, Suite 105
Greensboro, NC 27409
D a t e :
4 /1 3 /1 7
P h o t o g r a p h e r :
E .
H e n r i q u e s
1
Location / Orientation East Side of MSW Landfill
Remarks Well MW-2B located between two large trees
Attachment III – Proposed Monitoring Well Construction
Diagram
PROPOSED MONITORING WELL CONSTRUCTION*
*To be adjusted as appropriate based on actual subsurface conditions
WELL ID:MW-2C TOTAL DEPTH: ~ 25 ft bls
S&ME PROJECT AND NO:WELL USE / TYPE:INSTALLATION DATE:
Compliance
DRILLING CONTRACTOR:DRILLER AND LICENCE NO.:DRILLING METHOD:
WATER LEVEL AT TOB: NORTHING: EASTING:TOP OF CASING ELEV.:GROUND SURFACE ELEV.:
TBD
PAD TYPE:
PROTECTIVE CASING:
Depth BLS
0 ft - Top of Grout CASING TYPE:
CASING INTERVAL:
SCREEN TYPE:
SCREEN INTERVAL
GROUT TYPE:
GROUT INTERVAL
SEAL TYPE:
SEAL INTERVAL:
FILTER PACK:
FILTER PACK INTERVAL:
Screened DEVELOPMENT:
Interval
20 feet NOTES:
20 feet of screen to accommodate
likely seasonal water level changes
TBD - To Be Determined
bls = below land surface
25 ft - Bottom of Screen
5 - 25 feet bls
Portland
0 - 4 feet bls
surge / pump
bentonite
2 - 4 feet bls
#2 sand
4 - 25 feet bls
TBD TBD
TBD
Davie County Landfill/ S&ME Project No. 1584-98-109A
TBD
TBD
Hollow Stem Auger
TBD
concrete
post type well cover
2-inch diameter, PVC
0 - 5 feet bls
2-inch dia. PVC factory slotted 0.010 screen
5 ft - Top of Screen
Cave In
ft bls - Total Depth
TBD
Stickup (ft): ~ 2.5 ft
2 ft - Top of Seal
4 ft - Top of Filter Pack