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Milan A r m y Ammun i t i on Plant
Record of Decision (Final)
Sunny Slopes Munitions Response Site
Milan Anny Ammunition Plant
Milan, Tennessee
July 19. 2012
Record of Decision (Final)
Sunny Slopes Munitions
Response Site
Prepared^ Milan Army Ammunition Plant
Prepared by:
ARCADIS U.S., Inc. 2849 Paces Ferry Road Suite 400 Atlanta
Georgia 30339 Te! 770.431,8666 Fax 770-435.2666
Our Ret.:
GP1 MILAN
July 19. 2012
This document is intended only for the use of the individual or entity for which it was prepared and may contain information that is privileged, confidential and exempt from disclosure under applicable law. Any dissemination, distribution or copying of this document is strictly prohibited-
Record of Decision
Sunny Slopes Munitions Response Site
1. Declaration
1.1 Site Name and Location
1.2 Statement of Basis and Purpose
1.3 Assessment of the Site
1.4 No Action Decision
1.5 Statutory Determinations
1.6 Authorizing Signatures
2. Decision Summary
2.1 Site Name, Location, and Desaiption
2.2 Sunny Slopes MRS History and Enforcement Actions
2.3 History of Site Investigations
2.4 Community Participation
2.5 Scope and Role of Operable Unit or Response Action
2.5.1 Response Actions within 0U5
2.5.2 Response Actions within Sunny Slopes
2.5.3 Response Actions within other OUs
2.6 Site Characteristics
2.6.1 Sunny Slopes Area Topography and Geology
2.6.2 Nature and Extent of Contamination
2.7 Current and Potential Future Land and Resource Uses
2.7.1 Current and Anticipated Future Land Use
2.7.2 Surrounding Land Use
2.7.3 Current Groundwater Use
2.8 Summary of Site Risks
2.9 No Action Decision
2.10 Statutory Determinations
2.11 Documentation of Significant Changes
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4
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Record of Decision
Sunny Slopes Munitions Response Site
3. Responsiveness Summary
4. References
Figures
Figure 1
Figure 2
Figure 3
Location Map
Site Map
MEC Exposure Pathways Analysis
14
15
Record of Decision
Sunny Slopes Munitions Response Site
Acronym List
ABA
ARCADIS
bgs
CERCLA
CERCLIS
CSM
CTT
FFA
lAGR
IRP
LAP
MLAAP
MEC
MMRP
MRS
MRSPP
NCP
NFA
NPL
RAB
RCRA
Rl
ROD
SI
TDEC
USAGE
USEPA
Ammunition Burnout Area
ARCADIS U.S., Inc,
Below ground surface
ODmprehensive Environmental Response, Compensation, and Liability Act
Comprehensive Environmental Response, Compensation, and Liability Information System
Conceptual Site Model
Closed, Transferring and Transferred
Federal Facility Agreement
Instrument Assisted Ground Reconnaissance
Installation Restoration Program
Load, Assemble and Package
Milan Army Ammunition Plant
Munitions and Explosives of Concern
Military Munitions Response Program
Munitions Response Site
Munitions Response Site Prioritization Protocol
National Oil and Hazardous Substances Pollution Contingency Plan
No Further Action
National Priorities List
Restoration Advisory Board
Resource Conswvation and Recovery Act
Remedial Investigation
Record of Decision
Site Inspection
Tennessee Department of Environment and Conservation
United States Army Corps of Engineers
United States Environmental Protection Agency
iir
Record of Decision
Sunny Slopes Munitions Response Site
1. Declaration
1.1 Site Name and Location
This Record of Decision (ROD) addresses the remediat decision for the Sunny Slopes Munitions Response Site (MRS) within Operable Unit (OU) 5 at the Milan Army Ammunition Plant (MLAAP), located in Gibson and Carroll counties, Tennessee (Figure 1). The 2010 Military Munitions Response Program (MMRP) Remedial investigation (Rl) identified no Munitions and Explosives of Concern (MEC) at the MRS. A Final ROD (United States Arniy Corp of Engineers [USAGE] 1998) under the Installation restoration Program (IRP) was completed for environmental constituents and determined that no further action (NFA) was required. The Comprehensive Environmental Response, Compensation, and Liability Information System (CERCLIS) identification number for MLAAP is TND210020582.
1.2 Statement of Basis and Purpose
This decision document presents that no remedial action is necessary for the Sunny Slopes MRS at MLAAP. This decision was prepared in accordance witii EPA ROD guidance (EPA 540-R-98-031, July 1999), the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), as amended, and the National Oil and Hazardous Substances Pollution Contingency Plan (NCP). This decision is based on the Administrative Record file for this Site.
The United States Environmental Protecdon Agency (USEPA) and the Tennessee
Department of Environment and Conservation (TDEC) concur with the information and
basis for the remedy as described in the Record of Decision. As required in the NCP at
40 CFR 300.430 (f)(4XiiiXA), the United States Army (Army) and the United States
Environmental Protection Agency (USEPA) jointly selected the remedy. The selected
remedial action was agreed upon by tiie Army, the USEPA, and the Tennessee
Department of Environment and Conservation (TDEC), as mandated by the Federal
Facility Agreement for MLAAP, executed pursuant to CERCLA 120.
1.3 Assessnnent of the Site
The MMRP was initiated at MLAAP in 2003 with the Closed, Transferring, and
Transfenred (CTT) Range inventory, which identified sites for inclusion into the
program. A MMRP Site Inspection (SI) for MLAAP was completed in 2005. During the
SI, no MEC or munitions debris was found at Sunny Slopes. Four unidentified
subsurface ferrous anomalies were recorded. While the historical and surface visual
Record of Decision
Sunny Slopes Munitions Response Site
data collected during the SI supported a NFA determination. Sunny Slopes was
recommended for an enhanced SI to further Investigate the four subsurface anomalies.
The SI was focused on MEC since environmental constituents were previously
addressed in ttie IRP Final ROD (USAGE 1998) and a detemilnation of No Further
Action was approved.
Although an enhanced SI had been recommended for Sunny Slopes at the conclusion
of the SI, the MRS was included in the installation wide Rl for MMRP, which resulted in
a more extensive investigation. Rl fieldwork at the Sunny Slopes MRS was conducted
between April and August 2010, in accordance with the Final MMRP Work Plan dated
June 2010. No MEC was found at the site as a result of the Rl fieldwork. Based on
the lack of MEC found during the Rl and all previous studies, a negligible risk of MEC
was determined for the Sunny Slopes MRS. NFA was recommended for MEC at the
Sunny Slopes MRS within the Final MMRP Rl Report (ARCADIS 2010).
1.4 No Action Decision
No remedial action is necessary for the Sunny Slopes MRS. Normal operational
maintenance and/or use of the site may continue without restriction.
1.5 Statutory Determinations
No remedial action is necessary to ensure protection of human health or the environment at the Site.
1.6 Authorizing Signatures
fOcni^A' LTC Norbert A^ochs
MLAAP QefnvAnder
31 /ho / ^ Date
I, Director
Superfund Division
U.S. Environmental Protection Agency, Region IV
Record of Decision
Sunny Slopes Munitions Response Site
Robert A. Binford, Diremor
Division of Remediation
Tennessee DeparUnent of Environment and Conservation
ly 3 - ^ / Z-̂
Date
Record of Decision
Sunny Slopes Munitions Response Site
2. Decision Summary
2.1 Site Name, Location, and Description
MLAAP is located in portions of Gibson and Carroll counties in westem Tennessee as
shown on Figure 1. The City of Milan is immediately to the west of MLAAP and is
approximately 50 miles east of the Mississippi River. MLAAP is bordered on the
northeast and east by land owned by the Tennessee National Guard Bureau, on the
west and northwest by land owned by the City of Milan and the University of
Tennessee, and on the north and south by privately owned farm land. MLAAP was
placed on the National Priorities List (NPL) on July 22, 1987. The U.S. Arniy is the lead
agency for developing and preparing this ROD.
MLAAP began operation in 1942 and is currentiy an active Army installation (or post)
with the mission of loading, assembling, packaging, storing, and shipping medium- and
large-caliber ammunition. The post covers approximately 22,420 acres and includes
10 ammunition load, assemble, and package (LAP) lines; one washout/rework line;
one central x-ray facility; one test area; two shop maintenance areas; 16 permitted
hazardous waste storage areas (14 permitted magazine container storage igloos, one
container storage building for non-explosive wastes, and one explosive waste transfer
facility); a demolition and buming grounds area; and an administrative area. In
addition, there are seven industrial wastewater treatment facilities. Administrative
support, storage and disposal facilities, and active and inactive production facilities are
dispersed among wooded areas and cultivated fields.
Sunny Slopes, also known as the Former Ammunition Burnout Area (ABA) and the
Closed Buming Grounds, is located within 0U5 just south of Route 2 in ihe westem
portion of the installation and was once part of Sunny Slopes Farni (see Figure 1).
This ROD addresses MEC for Sunny Slopes; an existing NFA Final ROD was issued in
1998 for environmental constituents.
2.2 Sunny Slopes MRS History and Enforcement Actions
Sunny Slopes, also known as the ABA and the Closed Buming Grounds, is a 2-acre MRS located just south of Route 2 in the westem portion of the installation and was once part of Sunny Slopes Farm. It contains a number of concrete aprons, reinforced concrete walls, an eartii-covered storage magazine, old metal storage racks, and a newer storage building associated with the operational pistol range (Figure 2). The site was used from the 1940s to tiie 1950s for the burnout of munitions, including large projectiles, in a cement containment area. All wastes from burning were reportedly
Record of Decision
Sunny Slopes Munitions Response Site
removed from the site. Disposal by burial pits was not reported on this site. No MEC have been reported during previous investigations at this MRS, and specific munitions types historically used are unknown.
MLAAP was placed on the NPL In 1987. The Department of the Army, USEPA, and the
State of Tennessee signed a CERCLA Federal Facility Agreement and Consent Order
(FFA) in 1989 to establish a formal framework by which all signatory parties vAW
proceed with investigation and subsequent cleanup of MLAAP. Execution of tiie FFA is
a requirement of CERCLA Section 120.
2.3 History of Site Investigations
Under the MMRP, a CTT Inventory, Historical Records Review, and a SI were completed for Sunny Slopes, with a focus on MEC. During the SI, no MEC or munitions debris was found at Sunny Slopes. Four unidentified subsurface ferrous anomalies were recorded. While the historical and surface visual data collected during the SI supported a NFA detennination, Sunny Slopes was recommended for an enhanced SI to further investigate the four subsurface anomalies. The SI was focused on MEC since environmental constituents were previously addressed in the IRP Final ROD (USAGE 1998) and a determination of No Further Action was approved.
Environmental sampling was conducted under the IRP at Sunny Slopes (also referred to as the former ammunition bumout area) under the 1988 and 1991 RIs. Six monitoring wells were installed and sampled. A total of 15 soil samples were collected at the site, including 5 soil borings to a depth of 12 feet. One sediment sample was collected from Wolf Creek. The Final Analysis for Remedial Action - Milan Army Ammunition Plant (PBS&J, 1988) and the Final Remedial Investigation Report - Milan Arniy Ammunition Plant (IFC, 1991) indicates there was no soil, groundwater, or sediment contamination associated witii the Sunny Slopes area. The Final ROD (USAGE, 1998), in accordance witii the IRP, identified NFA for environmental constituents at Sunny Slopes because the site did not pose a current or potential threat to human health or the environment.
The ROD for Sunny Slopes is based on information presented in greater detail in the
following reports:
1981 Milan Army Ammunition Plant Contamination Survey Report prepared by the U.S. Army Toxic and Hazardous Materials Agency (USATHAMA)
• 1988 Final Report Investigation and Engineering Analysis for Remedial Actions at the Milan Army Ammunition Plant prepared for the USAGE by PBS&J
Record of Decision
Sunny Slopes Munitions Response Site
1991 Remedial Investigation for Milan Army Ammunition Plant prepared for USAETHAMA by IGF Kaiser Engineers, Inc.
1998 Final Record of Decision
1999 Final Remedial Investigation Report - Milan Army Ammunition Plant
2003 CTT Inventory, MLAAP, Malcolm Pirnie, Inc.
2005 Final Historic Records Review, MLAAP, Malcolm Pimie, Inc.
2005 Final SI Report, MLAAP, Malcolm Pimie, Inc.
2010 Final Sunny Slopes MMRP Rl Report, MLAAP, ARCADIS-U.S.. Inc.
2.4 Community Participation
The public participation requirements in CERCLA and the NCP were followed and
implemented in the remedy selection process. TTiroughout the Rl process, the
community was updated via periodic Restoration Advisory Board (RAB) meetings. The
RAB at MLAAP was established in July 1994 as a forum for exchange of information
and partnership among local citizens, MLAAP, USEPA, and TDEC. Most importantiy,
the meetings provide a convenient foaim for the community to provide input on the
cleanup process.
The Administrative Record file and information repository are maintained at the U.S.
Army Environmental Office at MLAAP. An electronic copy of the information repository
is also maintained at the Mildred G. Fields Memorial Library in Milan, Tennessee.
Finally, an information repository was made available to the public via tiie intemet
(http-7/www.milanaaD-ar.com/) in 2004 to broaden community access to site files
related to cleanup activities at MLAAP.
NCP §300.430(f)(3)(i) requires the lead agency to do the following after preparation of
the Proposed Plan and review by the support agency:
• Publish a notice of availability and brief analysis of the Proposed Plan in a major
local newspaper
• Make the Proposed Plan and supporting analysis and information available In the
Administrative Record file
Record of Decision
Sunny Slopes Munitions Response Site
• Provide a reasonable opportunity, not less than 30 calendar days, for submission
of written and oral comments on the Proposed Plan and the material contained in
the Administrative Record file
• Provide the opportunity for a public meeting to be held during the public comment
period
• Keep a transcript of the public meeting held during the public comment period and
make such a transcript available to the public
• Prepare a written summary of significant comments, criticisms, and new relevant
infomiation submitted during the public comment period and the lead agency
response to each issue. The Responsiveness Summary must be available with the
ROD.
The requirements of NCP §300.430(f)(3)(i) were met as described in the following
paragraphs, The Draft Proposed Plan was made available to the public In March 2011.
It can be found in the Administrative Record file and the information repository, along
with the Final MMRP RI for Sunny Slopes. Notices of availability of the Administrative
Record file documents were published in the Milan Mirror-Exchange, the Jackson Sun,
and the Carroll County News Leader in March 2011. A public comment period was
held from March 15, 2011 to April 15, 2011, and a public meeting was held on March
24, 2011 to present the Proposed Plan to the community. The Proposed Plan was
finalized in April 2011 and added to the administrative record file; no substantive
revisions were made to the Proposed Plan following the public comment period; no
comments were received during the public comment period as described in the
Responsiveness Summary, which is included as Section 3 of this Record of Decision.
The public participation requirements of CERCLA and the NCP were met as
summarized in the following chronology of community participation activities related to
the remedy selection process for Sunny Slopes MRS:
Activity
Remedial Investigation
Proposed Plan
Infornnalion Provided
Status Updates
Presented Final Rl
Notice of Availability
Forum
RAB Meeting
RAB Meeting
Newspapers
When
Periodically between 12/09 and 1/11
1/27/11
3/15/11
Record of Decision
Sunny Slopes Munitions Response Site
Activity
(Draft)
Fact Sheet for Proposed Plan
Proposed Plan (Final)
Information Provided
Opportunity to Comment
Opportunity to Comment
Presented
Presented
Forum
Public Comment Period
Public Comment Meeting
Public Comment Meeting
Administrative Record File
When
3/15/11 to 4/15/11
3/24/11
3/24/11
4/29/11
2.5 Scope and Role of Operable Unit or Response Action
2.5,1 Response Actions v̂ dthin 0U5
The Sunny Slopes MRS is located within 0U5 at MLAAP. Historical 0U5 remedial Investigations evaluated potential contamination source areas within the following areas:
Open Buming Ground
Former Ammunition Destruction Area
Gunent Ammunition Destnjction Area (active operation)
Ammunition Test Area
Ammunition Storage Area
Closed Ammunition Bumout Area (i.e.. Sunny Slopes)
Sanitary Landfill
Based on these investigations, the following response actions have been completed within 0U5:
• A No Further Action ROD for two areas in 1998: tiie Closed ABA (i.e.. Sunny
Slopes) and the Sanitary Landfill.
Record of Decision
Sunny Slopes Munitions Response Site
Removal of lead-contaminated soils from the base of a group of water towers. After completion of this removal action, it was determined (1997) that No Further Action was required for the water towers.
A time-critical removal was completed for the rail yard at Building Y-103 in 2002 in accordance with a 1999 engineering evaluation/cost analysis.
A ROD was issued in 2010 for the remediation of contaminated soils within the OBG area
In addition to the above response actions and the response action addressed in this ROD, the following response actions related to 0U5 are still within the feasibility study phase:
• Addressing MEC within the OBG area
• Addressing site-wide groundwater at MLAAP, which Includes areas of 0U5 with groundwater contamination
2.5.2 Response Actions within Sunny Slopes
The scope of the response action under this ROD addresses MEC and will serve as tiie final response action planned for the MRS. A previous ROD was Issued for Sunny Slopes, as part of OU 5, under tiie IRP for environmental contamination within soil and sediment (USAGE 1998). The Final ROD, in accordance with the IRP, identified NFA for environmental constituents within soil and groundwater at Sunny Slopes because the site did not pose a current or potential threat to human health or the environment.
The MMRP Rl for MLAAP was initiated In December 2009, Although an enhanced SI
had been recommended for Sunny Slopes at the conclusion of the SI, the MRS was
Included in the installation wide Rl for MMRP, which resulted in a more extensive
Investigation. Rl fieldwork was conducted in two phases between April and August
2010, in accordance w\\U tiie Final MMRP Work Plan (ARCADIS 2010a). The Phase I
fieldwork in April 2010 included an instrument assisted ground reconnaissance (lAGR),
during which surface and subsurface metallic anomalies were counted along
predefined transects. During the lAGR, munitions debris associated with two 8-inch
projectiles (empty) were found on the surface. These Items were determined not to
contain an explosive hazard. The field team observed no indications that these two
items were related to former disposal operations at Sunny Slopes; rather they were
most likely brought to the site and discarded on the surface. The lAGR data was used
Record of Decision
Sunny Slopes Munitions Response Site
to estimate the preliminary surface and subsuri'ace anomaly density of the MRS In
order to ftirther refine Phase II of the Rl. Phase II of the Rl fieldwork (June-August
2010) included a Digital Geophysical Mapping investigation and intrusive investigation
of select subsurface anomalies. In accordance with selection criteria outiined in the
Final MMRP Wori< Plan, 65 anomalies were selected for intrusive investigation, which
included the four anomalies identified during the SI. No MEC was found at the site.
Out of the 65 anomalies investigated, only one munitions debris item was recovered; a
portion of a smoke grenade canister found close to the ground surface. This munitions
debris item corresponded with one of the anomalies identified during the SI, and does
not represent an explosive hazard. The remainder of the anomalies intrusively
Investigated were identified as non-munitions-related scrap metal, such as metal
fencing and nails.
In summary, based on the lack of MEC found during the Rl and all previous studies, a
negligible risk of MEC was determined for the Sunny Slopes MRS. Thus, no remedial
action is necessary for the Sunny Slopes MRS.
2.5.3 Response Actions within other OUs
MLAAP is divided into the following OUs to address various impacted media
throughout the site:
• 0U1 : Contaminated groundwater emanating from the 0-Line Ponds
• OU2: Contaminated soil and sediment within the O-Line Ponds
• 0U3: Contaminated media within the northeastem portion of the Installation
• 0U4: Contaminated media with the northwestern portion of the installation
• OUS: Contaminated media within the entire southern portion of the installation
Response actions or interim response actions are already in place for 0U1 , 0U2, 0U3
soil and portions of the groundwater, 0U4 soil and portions of the groundwater, and
0U5 as described in Section 2.5.1.
10
Record of Decision
Sunny Slopes Munitions Response Site
2.6 Site Characteristics
This section provides an overview of the site characteristics for the Sunny Slopes
MRS.
2.6.1 Sunny Slopes Area Topography and Geology
The Sunny Slopes MRS is situated in the westem portion of MLAAP. The Sunny
Slopes area consists of approximately 15 acres characterized by undergrowth, with
some deciduous trees. In the vicinity of the active pistol range the area is cleared and
is maintained for use. Adjoining cattle pastures are grassy (Malcolm Pimie, 2005b).
Topography within Sunny Slopes generally slopes toward the West Fork of Wolf Creek,
whidi crosses the site along tiie nortti-south axis, flowing northward (Malcolm Pimie.
2005b). The presence of a creek increases drainage from the site. The creek flows
northeastward at the site and forms Wolf Creek in the northern portion of the
installation. Site drainage is toward the creek as it has cut a gully through the area,
which controls the local hydrology.
The shallow geology beneath the Sunny Slopes is composed of sediments indicative of
the Memphis Sand "500''-foot aquifer that underiies MLAAP. Geologically, the Memphis
Sand consists primarily of a thick body of sand with discontinuous lenses of clay that
constitute only a small percentage of the total tiiickness. In the subsurface, the sand Is
thick bedded, white to brown or gray, and very fine grained to gravelly. The upper
portions of the Memphis Sand commonly contain fine sediments and soil borings
advanced from zero to 10 feet below ground surface (bgs) are characterized by sandy
silts and clayey sands. The deptii to the water table in the vicinity of the Sunny Slopes
is approximately 80 feet bgs.
2.6.2 Nature and Extent of Contamination
No MEC has been found during previous MMRP investigations at Sunny Slopes,
Including the 2010 Rl. As such, there is a negligible risk for MEC at Sunny Slopes.
Figure 3 illustrates the Conceptual Site Model (CSM) for Sunny Slopes. Due to the
absence of MEC on the site there are Incomplete exposure pathways for all human
and ecological receptors.
An NFA ROD (USAGE 1998) is already in place for environmental constituents at
Sunny Slopes.
11
Record of Decision
Sunny Slopes Munitions Response Site
2.7 Current and Potential Future Land and Resource Uses
2.7.1 Current and Anticipated Future Land Use
MLAAP is currentiy an active Army installation (or post). The installation currentiy
leases land (outside of industrial areas) for agricultural purposes, including grazing
cattle and growing crops. The installation also issues permits for hunting and fishing (in
non-secured areas) to active duty and retired military personnel and civilian
employees. MLAAP is housed on 22,420 acres with 1,450 buildings. 873 igloos, and a
storage capacity of 2,270,000 square feet.
The Sunny Slopes MRS is currentiy inactive and unoccupied, with hunting allowed In
close proximity to the site. An operational pistol range Is located in the center of the
MRS; however, it is excluded from the MRS acreage and boundaries since it is an
active range.
Future uses of MLAAP are anticipated to realign fi-om LAP of munitions to operations
focused on munitions storage. The LAP operations will be placed in stand-by mode for
an unspecified period of time In case a future demand for these services develops.
MLAAP is not on the list for base closure, and there are no plans for closing the
Installation, The U.S. Army has no foreseeable plans to develop or use Sunny Slopes
MRS for any industrial or residential purpose. The pistol range will remain active, and
tfie other areas will remain fallow or inactive.
2.7.2 Surrounding Land Use
The Sunny Slopes MRS Is completely surrounded by portions of the Ml_AAP
installation, and the nearest distance to the MLAAP boundary is approximately 0.5
miles. The land surrounding ML^AP Is predominantly rural and consists mainly of
undeveloped land with portions being used for agricultijral and agricultural research
purposes. Adjacent and to the west of MLAAP is tiie City of Milan with adjoining
properties being used primarily for commercial/industrial purposes.
2.7.3 Current Groundwater Use
Groundwater at MLAAP is used for industrial, agricultural, and potable purposes. Both
public and private wells are located off-post. The private wells supply low quantities of
water for domestic or farm usage. Existing public supply wells are not anticipated to be
impacted by any groundwater contamination associated v«tti MLAAP.
12
Record of Decision
Sunny Slopes Munitions Response Site
The anticipated future use of groundwater at MLAAP and in the vicinity of MLAAP is
not expected to change based on the Army's current mission at the installation and
overall land use control management plan.
2.8 Summary of Site Risks
As part of the 2010 Final MMRP Rl Report for Sunny Slopes, a risk characterization of
the site was completed. This risk characterization included updates to the 2005 MRS
Prioritization Protocol (MRSPP) for Sunny Slopes. The MRSPP is a tool developed by
tiie Department of Defense that is used to assign a relative priority for munitions
response based on the overall conditions at the MRS, taking into consideration various
factors related to safety and environmental hazards. The MRSPP was published final
in the Federal Registrar, 32 Code of Federal Regulations, in October 2005. The
MRSPP is comparable to the Relative Risk Site Evaluation for IRP sites. Site scores
are updated annually as new information becomes available. The Rl data for Sunny
Slopes was incorporated into the revised MRSPP. The Sunny Slopes MRS received an
overall site rating/priority of "No Known or Suspected Hazard". This rating represents
the negligible MEC risk for Sunny Slopes MRS based on the R! results.
The risk characterization found that because no MEC were identified during the SI or
Rl surface or intrusive investigations, the probability of encountering MEC within the
MRS is considered negligible. The CSM for the Sunny Slopes MRS (Figure 3)
illustrates that no complete or potentially complete pathways exist for MEC on the site.
2.9 No Action Decision
No remedial action is necessary for the Sunny Slopes MRS. Normal operational
maintenance and/or use of the site may continue Vkfithout restriction.
2.10 Statutory Determinations
The U.S. Army has. In conformance with CERCLA §121 and the NCP, detemiined that
no remedial action is necessary to ensure protection of human health or the
environment at the Sunny Slopes MRS, As required in the NCP at 40 CFR 300.430
(f)(4XiiiXA), the U.S. Army and the USEPA jointly selected the remedy. The selected
remedial action was agreed upon by the Anny, the USEPA, and the TDEC, as
mandated by the Federal Facility Agreement for MLAAP, executed pursuant to
CERCLA 120.
13
Record of Decision
Sunny Slopes Munitions Response Site
2.11 Documentation of Significant Changes
The Proposed Plan for tiie Sunny Slopes MRS was released for public comment in February 2011. The Proposed Plan recommended NFA for the MRS because It was determined that the risk for receptors encountering MEC at the MRS is negligible. The A m y received no comments during the public comment period. Therefore, it was determined that no significant changes to tiie remedy, as identified in the Proposed Plan, were necessary or appropriate.
3. Responsiveness Summary
No written or oral comments were received by the U.S. Army or USEPA during the
public comment period.
14
Record of Decision
Sunny Slopes Munitions Response Site
4. References
ARCADIS 2010. Final Remedial Investigation, Sunny Slopes Munitions Response Site,
Milan Army Ammunition Plant, Milan, Tennessee. December 2010,
ARCADIS 2011. Final Proposed Plan, Sunny Slopes Munitions Response Site, Milan
Army Ammunition Plan, Milan, Tennessee. February 2011.
ARCADIS 2010. Final MMRP Remedial Investigation Work Plan, Milan Arniy
Ammunition Plant, Milan, Tennessee, June 2010
ICF, 1991. Final Remedial Investigation Report - Milan Army Ammunition Plant
Malcolm Pimie. 2005a. Final Historical Records Review, Milan Army Ammunition Plant,
Milan Tennessee.
Malcolm Pimie. 2005b. Final Site Inspection Report, Milan Amiy Ammunition Plant,
Milan Tennessee.
Malcolm Pirnie. 2003, Final CTT Range Inventory Report, Milan Army Ammunition
Plant, Milan Tennessee.
PBS&J, 1988, Final Analysis for Remedial Action - Milan Army Ammunition Plant.
USAGE, 1998. Final Record of Decision. 1998.
USEPA. 1999. A Guide to Preparing Superfund Proposed Plans. Records of Decision,
and Other Remedy Selection Decision Documents. July 1999.
USEPA. 1990. National Oil and Hazardous Substances Pollution Contingency Plan.
March 1990.
15
Miles
N
A Scale Varies
Data is projected to the UTM Coorcfinafe Sysfem,-Zone i m , NAD83, Units in Meters.
Figure 1
Location Map Sunny Slopes
Milan AAR
Milan AAP Milan, Tennessee
Contract #: GS-10F-0266K W911SO-04-F-001i
Legend
Sunny Slopes MRS
Installation Boundary
Drawn By: S P C
Checked By; M T
Submitted By; D R Revision
Scale; Varies Rev:
Date Drawn: 9-27-2010
Path:
S:\Mtlan\Location.tnxd
N
A 200 100 0 200
Feet Data is projected lo the UTM Coordinate System:
Zone 13 North. NAD83, Units in Meters.
Figure 2
Sunny Slopes Site Map
Milan AAP Milan, Tennessee
Contract #: GS-10F-0266K W911 SO-04~F-0019
Legend Sunny Slopes MRS
Active Pistol Range
Drawn By: SPC
Checked By: MT
Submitted By; DR
Scale: 1 " = 2 0 0 f e e l Rev:
Date Drawn: •\ 2-21 -2009
Revision Date:
Path:
S:\Milan\Sunny Slopes Site Map.mxd
Source Area Access MEC Location/ Release
Mechanisms Activity Receptors
Authorized Instaiiation Personnel
Contractors / Visitors / Hunters
Trespasser Biota
Sunny Slopes MRS
Access Available —-»
MEC at Surfece
MEC in Subsurface ¥
Handfe/Tread Underfoot
t Intrusive ¥
o
o
o
o
o
o
o
o
• Complete Pathway (none identified)
O Incomplete Pathw/ay
C Potentially Complete Pathway
SUNNY SLOPES MRS - MEC EXPOSURE PATHWAY ANALYSIS
MILAN ARMY AMMUNITION P U N T . TENNESSEE
ARCADIS
Figure 3
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