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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


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



2.11 Documentation of Significant Changes

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Record of Decision


3. Responsiveness Summary

4. References

Figures

Figure 1

Figure 2

Figure 3

Location Map

Site Map

MEC Exposure Pathways Analysis

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Record of Decision


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


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


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).


No remedial action is necessary for the Sunny Slopes MRS. Normal operational

maintenance and/or use of the site may continue without restriction.


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


Robert A. Binford, Diremor

Division of Remediation

Tennessee DeparUnent of Environment and Conservation

ly 3 - ^ / Z-̂

Date

Record of Decision


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


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


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

http://www.milanaaD-ar.com/

Record of Decision


• 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


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


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


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.

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Record of Decision


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.

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Record of Decision


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.

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Record of Decision


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.


No remedial action is necessary for the Sunny Slopes MRS. Normal operational

maintenance and/or use of the site may continue Vkfithout restriction.


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


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


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