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EPA/ROD/R06-00/097 2000 EPA Superfund Record of Decision: FORT CHAFFEE EPA ID: AR1213720187 OU 03 FORT CHAFFEE, AR 12/13/1999
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EPA/ROD/R06-00/0972000

  EPA Superfund

   

Record of Decision:

   

FORT CHAFFEEEPA ID:  AR1213720187OU 03FORT CHAFFEE, AR12/13/1999

Environmental Sites

RECORD OF DECISION FOR 19NO FURTHER ACTION

GROUP III ENVIRONMENTAL SITES

Fort Chaffee,Arkansas

DECEMBER 13, 1999

RECORD OF DECISION FOR 19 NO FURTHER ACTIONGROUP III ENVIRONMENTAL SITES

FORT CHAFFEE, ARKANSAS

1.0 DECLARATION

This Record of Decision (ROD) document addresses nineteen (19) sites at Fort Chaffee,Arkansas for which the United States Army has been identified as the lead agency forComprehensive Environmental Response Compensation and Liability Act (CERCLA) responseactions. The United States Army Fort Chaffee Base Transition Team (FCBTT) is the on-siteorganization responsible for the response actions. The No Further Action Group III Siteshave at some point been included in lists of sites that have some potential to require aresponse under CERCLA. The Proposed Plan of Action, issued for public review on February10, 1999, included twenty-one sites for no further action. The two sites not addressed inthis ROD include Site FTCH-012, Hazardous Waste Satellite Accumulation Point, and SiteFTCH-017, Vehicle Washrack Ditches. These two sites will be addressed in a subsequent ROD.Areas that are to be transferred from the Army for reuse are referred to as the ExcessArea. Sites within the property retained by the Arkansas Army National Guard and Army Reserves are referred to as the Enclave Area. Sites are located in the Excess Area,Enclave Area, or both as noted below. The sites addressed in this ROD are described asfollows:

Group III-A: RCRA Closure Sites

Site FTCH-020, Open Burn/Open Detonation (OB/OD) Unit (Enclave Area) Site FTCH-023, Defense Reutilization and Marketing Office (DRMO) Hazardous Waste Storage Area (Excess Area)

These sites are shown in the attached Figure 1.

Group III-B: Petroleum Product Storage Areas

Site FTCH-019, Waste Oil Storage Tanks, West Area (WA)-3 (Excess Area) Site FTCH-034, Oil/Water Separators (OWSs) (Excess Area and Enclave Area) Site FTCH-035, Underground Storage Tanks (USTs) (Excess Area and Enclave Area) Site FTCH-036, 9th Avenue USTs, WA-1, -2, -4, -5, -6, -7 and Building (B) 5524 (Excess Area) Site FTCH-038, Building 428 USTs (Excess Area)

These sites are shown in the attached Figure 2.

Group III-C: Miscellaneous Sites

Site FTCH-009, DDT Storage Area (Excess Area) Site FTCH-016, Wood/Burnable Disposal Site (Excess Area) Site FTCH-021, Waste Oil Accumulation Points:

Site 21A, B262 (Excess Area) Site 21B, B423 (Excess Area) Site 21C, B421 (Excess Area) Site 21D, B2454 (Enclave Area) Site 21F, HWSAP, B470 A, B (Enclave Area, Army Reserves) Site 21G, HWSAP, B2055 (Enclave Area)

Site FTCH-027, Hospital Incinerator (Excess Area) Site FTCH-033, OWS Sludge Disposal Area (Excess Area) Site FTCH-039, Oil Trenches Site (OTS) (Enclave Area) Site FTCH-042A, Pesticide Handling Area, B540 (Excess Area)

These sites are shown in the attached Figure 3.

The 19 Group III Sites addressed in this ROD require no further action for protection ofhuman health and the environment, and can be transferred without CERCLA-related land userestrictions. Sites considered to be in the Excess Area include: Site 9, 16, 19, 21A, 21B,21C, 23, 27, 33, 34, 35, 36, 38, and 42A. Sites specified to be in the Enclave Areainclude: Site 20, 21D, 21F, 21G, 34, 35, and 39. In this document, Fort Chaffee isconsidered to consist of the geographic extent of the Fort Chaffee Military Reservation atthe time it was closed in October 1997. Laboratory analyses were performed on variousmedia to support the no further action decision. Analyses may have included volatileorganic compounds (VOCs), semi-volatile organic compounds (SVOCs), metals, pesticides, herbicides, total petroleum hydrocarbons (TPH) for diesel range organics (DRO) andgasoline range organics (GRO), metals, explosives, and polychlorinated biphenyls (PCBs)using USEPA SW-846 “Test Methods for the Evaluating Solid Waste, Physical/ChemicalMethods.”

The FCBTT encourages the public and other interested parties to review relevantinformation to gain a better understanding of these environmental sites. All samplingresults used for site evaluations of the current environmental condition at Fort Chaffeeare part of the information in the Administrative Record for Fort Chaffee. TheAdministrative Record for Fort Chaffee environmental compliance efforts can be viewed ateither of the following two locations:

Fort Chaffee Base Transition Team Environmental Compliance Office

Building 2033, 1st Avenue Barling, Arkansas 72923

or Fort Smith Public Library

61 South 8th Street Fort Smith, Arkansas 72901

1.1 GROUP III-A, RCRA CLOSURE SITES

1.1.1 Name and Location of Sites

OB/OD Unit (FTCH-020) (Enclave Area) and the DRMO Hazardous Waste Storage Area(FTCH-023)(Excess Area).

These sites are located at Fort Chaffee, Arkansas and are shown in Figure 1.

1.1.2 Statement of Basis and Purpose

This decision document presents the selected remedial action for each of the sites listedabove. The selected remedies were chosen in accordance with CERCLA, as amended by theSuperfund Amendment and Reauthorization Act (SARA), Army Regulation 200-1, and to theextent practicable, the National Contingency Plan. This decision is based on theAdministrative Record for these sites.

1.1.3 Description of the Selected Remedy

No further action will be taken at these sites. Selection of this remedy is based onknowledge of site histories and operation, removal of waste residues from Site FTCH-020and stored material from Site FTCH-023, closure activities in accordance with ArkansasDepartment of Environmental Quality (ADEQ) approved closure plans, and an evaluation ofthe current condition of these sites, including soil and groundwater sampling, asappropriate. The ADEQ was formerly the Arkansas Department of Pollution Control & Ecology(ADPC&E).

1.1.4 Declaration Statement

No further remedial response action is required to ensure protection of human health andthe environment, and no CERCLA- related restriction on land uses is required.

1.2 GROUP III-B, PETROLEUM PRODUCT STORAGE AREA

1.2.1 Name and Location of Sites

Waste Oil Storage Tanks WA-3 (FTCH-019) (Excess Area), OWSs. (FTCH-034) (Excess Area and Enclave Area), USTs (FTCH-035) (Excess Area and Enclave Area), 9th Avenue USTs WA-1, -2, -4, -5, -6, -7 and B5524 (FTCH-036) (Excess Area), USTs B428 (FTCH-038) (Excess Area).

These sites are located at Fort Chaffee, Arkansas and are shown on Figure 2.

1.2.2 Statement of Basis and Purpose

This decision document presents the selected remedial action for each of the sites listedabove. The selected remedies were chosen in accordance with CERCLA, as amended by theSuperfund Amendment and Reauthorization Act (SARA), Army Regulation 200-1, and to theextent practicable, the National Contingency Plan. This decision is based on theAdministrative Record for these sites. UST sites have been closed in accordance with therequirements of the Regulated Storage Tank (RST) Division of the ADEQ. The level andextent of remedial activities and the results of environmental sampling at tank locationshave achieved closures protective of human health and the environment. These sites areclassified as “no further action” required or “no further assessment” required. Inclusionof these sites in this CERCLA ROD is required to document that no additional actions arerequired.

1.2.3 Description of Selected Remedy

No further action will be taken at these sites. Selection of this remedy is based onknowledge of site history and operation, UST removals in accordance with RST regulations,and an evaluation of the current condition of these sites, including soil and groundwatersampling as appropriate.

1.2.4 Declaration Statement

UST sites have been closed in accordance with ADEQ RST requirements. No further remedial response action is required to ensure protection of human health and the environment. No CERCLA-related restriction on land use is required since all screening/cleanup levels werecompatible for residential reuse with the exception of the OWS located at B2480 and theUST at B2219. These are located within the Enclave Area retained by the Army.

1.3 GROUP III-C, MISCELLANEOUS SITES

1.3.1 Site Name and Location

DDT Storage Area (FTCH-009) (Excess Area), Wood/Burnable Disposal Site (FTCH-016) (Excess Area), Waste Oil Accumulation Points (FTCH-021) (Excess Area and Enclave Area), Hospital Incinerator (FTCH-027) (Excess Area), OWS Sludge Disposal Area (FTCH-033) (Excess Area), OTS (FTCH-039) (Enclave Area), Pesticide Handling Area, B540 (FTCH-042A) (Excess Area).

These sites are located at Fort Chaffee, Arkansas and are shown on Figure 3.

1.3.2 Statement of Basis and Purpose

This decision document presents the selected remedial action for each of the sites listedabove. The selected remedies were chosen in accordance with CERCLA, as amended by theSARA, Army Regulation 200-1, and to the extent practicable, the National Contingency Plan.

This decision is based on the Administrative Record for these sites.

1.3.3 Description of the Selected Remedy

No further action will be taken at these sites. Selection of this remedy is based onknowledge of site histories and operations, recent site evaluations, and removalactivities that were implemented to protect human health and the environment. Evaluationsof current site conditions including soil and groundwater sampling support the selectedremedy of no further action.

1.3.4 Declaration Statement

No further remedial response action is required to ensure protection of human health andthe environment, and no CERCLA-related restriction on land uses is required.

2.0 DECISION SUMMARY

This decision document addresses 19 sites at Fort Chaffee, Arkansas for which the UnitedStates Army has been identified as the lead agency for CERCLA response actions. The FCBTTis the on- site organization responsible for these actions. The Group III Sites have atsome point been included in lists of sites at Fort Chaffee that have some potential torequire a response under CERCLA. UST sites have been remediated and closed as required bythe RST Division of the ADEQ to ensure protection of human health and the environment. Theremaining sites either required no action or have been remediated such that no furtheraction is required for protection of human health and the environment. All samplingresults and referenced documents used to characterize the 19 sites are found in theAdministrative Record for Fort Chaffee located at the Fort Smith Public Library and the Fort Chaffee Base Transition Team-Environmental Compliance Office.

In this document, Fort Chaffee is considered to consist of the geographic extent of theFort Chaffee Military Reservation at the time of closure. As part of the Base Realignmentand Closure (BRAC) process, Fort Chaffee was closed in October 1997. Fort Chaffee,Arkansas is about seven miles east-southeast of Fort Smith, Arkansas. The militaryreservation consisted of over 71,000 acres. Most of the land became part of the FortChaffee Maneuver Training Center operated by the Arkansas Army National Guard for reservecomponent training. The area retained by the United States Army and licensed to theArkansas Army National Guard is referred to as the Enclave Area. The remaining 7,000 acresreferred to as the Excess Area, will be disposed by the United States Army and is available for community reuse. The attached figures show the location of the sitesdiscussed in this decision document. The proposed future use, the human health screening/cleanup levels achieved through the environmental restoration program, and the historicaluses of the 19 sites by the military are presented in Table 1. The ecological status ofeach site is summarized in Table 2.

2.1 GROUP III-A, RCRA CLOSURE SITES FIGURE 1

2.1.1 Site FTCH-020, Open Burn/Open Detonation Unit (Enclave Area)

2.1.1.1 Site Location and Description

This site is located on a 4-acre plot in the north-central portion of the installation atthe intersection of Carnis Auburn and Auburn Roads. The site was used to destroy unusedpropellant increments (bags of powder to fire artillery) and to detonate explosive-filledmunitions.

2.1.1.2 Site History and Enforcement Activities

The site began operations in 1988 as three aboveground clay-lined trenches and two smallbermed pits. Each trench was about 10 feet wide by 110 feet long and 6 inches deep. Eachpit as about 20 feet long by 20 feet wide, with 5-foot berms constructed on three sides. ARCRA Facility Assessment (RFA) was conducted in 1988, and both soil and ground water weresampled (United States Army Environmental Hygiene Agency [USAEHA], 1988b, 1988c). In 1993,burn residues and a small amount of surface soil on top of the open burn trenches were removed and properly disposed. The clay-lined trenches were then removed and filled withclean soil. Three elevated burn-pan units with covers were constructed on top of theformer trenches. Fort Chaffee personnel conducted confirmatory sampling in 1992.

2.1.1.3 Site Characteristics

In 1988 low-level explosive residue was detected in site burn trench soil samples. No soilsamples showed positive results for other volatile or semivolatile organics, or detectableresults for extractable metals. Neither explosive compounds nor other organic chemicalswere detected in groundwater samples. Low concentrations of total metals in ground waterwere detected, but were considered naturally occurring.

In 1992, confirmatory sampling measured lead in trench soil using the ToxicityCharacteristic Leaching Procedure (TCLP) and explosive residue to determine if in-situstabilization and off-site landfill disposal would be required. No contamination was foundin either surface soil or groundwater samples. In 1997, per closure plan requirements,field activities included an Explosive Ordnance Disposal (EOD) Scan, removal of debris,and decontamination and disposal of burn pans. During these remedial closure activities,22 decontaminated burn pans and covers and one 55-gallon drum of non-hazardous metaldebris were collected for off-site disposal. Soil, surface water, and groundwater sampleswere analyzed and found to meet state clean-closure criteria.

2.1.1.4 Summary of Site Risks

The OB/OD site was closed in accordance with ADEQ Closure Regulation 23 §265, SubsectionG. Site operational history and analytical data show no indication of a hazardoussubstance release outside the trench areas. There is no evidence of contaminationwarranting further action at this site. The site does not present unacceptable risk tohuman health and the environment, and no CERCLA-related restriction on land use isrequired. Closure documentation was approved by the ADEQ on March 16, 1999.

2.1.2 Site FTCH-023, DRMO Hazardous Waste Storage Area (Excess Area)

2.1.2.1 Site Location and Description

This site is a portion of B339 that is located in the central cantonment area of FortChaffee at the junction of Taylor and Darby Avenues (Figure 1). Building 339 was formerlyused as the post DRMO storage facility. The southwest end of the building served as atemporary storage area for hazardous waste prior to disposal. Wastes such as dischargedbatteries, paint wastes, PCB transformers, and solvents were put in containers, labeled,and stored on wooden pallets above the concrete floor. The discharged batteries werestored away from heat sources, moisture, and conductive surfaces, eliminating potentialfor release.

2.1.2.2 Site History and Enforcement Activities

No spills or releases of hazardous wastes were reported at this site (ERM, 1996). Thefacility has been closed and its inventory of waste removed. No additional wastes havebeen stored at the facility since 1994. In 1995, surface soil samples from outside B339and borehole soil samples from beneath the building’s concrete floor were analyzed forvolatile organic compounds (VOCs), semi-volatile organic compounds (SVOCs), metals,pesticides, herbicides, and PCBs. During 1998 closure activities, these same analytes wereagain tested to confirm previous results.

2.1.2.3 Site Characteristics

VOCs, SVOCs, pesticides, and herbicides were detected in the 1995 samples. The presence of pesticides and herbicides is attributed to routine application consistent with licensedapplication protocols and intended use, not a release from site related activities.Detected VOCs and SVOCs were considered as carrier compounds for the pesticides.

Sampling performed in 1998 indicates that metal concentrations in soil are consistent with background levels except for lead in one surface soil sample. The lead result isattributed to weathered lead-based paint from the exterior building wall. The walls arenow covered with metal siding. SVOCs detected in surface soils are most likely caused byremnants of asphalt from the parking lot where the soil was sampled and are not ascribedto site activities. No SVOCs were detected in the borehole samples.

Low levels of pesticides were detected in 1998 soil samples collected just outside andunderneath B339. The presence of pesticides is representative of routine applied use forpest-control and is not attributed to a release or related to hazardous waste storageactivities at the site.

2.1.2.4 A Summary of Site Risks

Detected compounds at Site FTCH-023 are not indicative of a hazardous materials release tothe environment. Based on site operation, history, and recent analytical data, no releaseof stored waste material occurred at this site. Site FTCH-023 does not presentunacceptable risk to human health and the environment, and no CERCLA-related restrictionon land use is required. Closure documentation was approved by the ADEQ on March 16, 1999.

2.2 GROUP III-B, PETROLEUM PRODUCT STORAGE SITES

The sites included in this group are OWSs and their associated waste storage tanks as wellas former USTs used for petroleum product storage. Fort Chaffee personnel addressed manyUST concerns in the mid-1980s to early 1990s. Leaking tanks and contaminated soil wereremoved according to closure plans. (USACE, 1989). The ADEQ approved a 100 parts-per-million (ppm) TPH cleanup level for removal of tanks. The level is conservative andprotective of human health and the environment. Sites 19, 36, 38, and parts of 34 and 35are located in the Excess Area to be transferred as part of the BRAC process.

2.2.1 Site FTCH-019, Waste Oil Storage Tanks, WA-3 (Excess Area)

2.2.1.1 Site Location and Description

This site was located near former B5670 in the west cantonment area (Figure 2). The siteconsisted of two 12,000-gallon USTs originally installed as petroleum storage tanks andsubsequently used for waste motor oil storage until 1986. A 1988 evaluation indicated thatspent solvents might also have been deposited in these tanks (USAEHA, 1988a).

2.2.1.2 Site History and Enforcement Activities

In 1989 toluene, ethylbenzene, xylenes, and TPH were detected in soil borings from SiteWA- 3. In July 1991, the tanks were emptied and removed and the tank hold was excavatedunder a UST removal plan coordinated with the ADEQ (ERM, 1996). Contaminated soils wereexcavated and treated via landfarming at the West Land Application Site.

2.2.1.3 Site Characteristics

In May and early June 1997, soil, surface water, and groundwater samples were obtainedfrom Site WA-3. These samples were analyzed for VOCs, SVOCs, TPH (both diesel and gasolinecomponents), and 8 metals. The soil, surface water, and groundwater samples did notcontain any organic analyte greater than the detection limit except for trace levels oflaboratory contaminants. Concentrations of metals detected in the soil samples, thesurface water sample, and the groundwater sample were representative of naturallyoccurring conditions. The presence of metals at low concentrations is representative ofnaturally occurring conditions and is not indicative of a release.

2.2.1.4 Summary of Site Risks

The ADEQ, RST Division, made a determination of “no further assessment” for this site inwritten correspondence dated December 1, 1998. No evidence of contamination exists at theformer UST site to warrant further action. The site does not present unacceptable risk tohuman health and the environment, and no CERCLA-related restriction on land use isrequired.

2.2.2 Site FTCH-034, Oil/Water Separators, OWS (Excess Area and Enclave Area)

Oil/Water Separator Locations

Excess Area Enclave Area

B262 B1912 B2035B429 B1939 B5566B1827 B1980 B5866B1828 B2020

B2060 B2340 B2480B2140 B2440 B2509B2240

2.2.2.1 Site Location and Description

Site FTCH-034 includes 20 OWSs at 18 locations (Figure 2). These locations containedreinforced concrete OWSs and associated steel USTs. Most wash rack separators were foundinoperative in 1988.

2.2.2.2 Site History and Enforcement Activities

Remedial activities on reinforced concrete OWSs and associated USTs occurred in 1997 and1998. At locations B2060, B2240, and B2340, the OWSs (5 units total) were decontaminatedand were closed in place to avoid damage and service interruptions to nearby water mains.These separators are all located in the Enclave Area. All other OWSs were decontaminated,removed, and disposed of as construction debris in an on-site construction material fillarea south of 1st Avenue. All USTs associated with the OWSs were cleaned, purged, removedand disposed of off site.

2.2.2.3 Site Characteristics

Confirmation samples from each excavation’s sidewalls and floor were taken. A confirmationwater sample was collected if intrusion water occurred in the excavations during separatorand tank removal. Samples were analyzed for VOCs, SVOCs, and TPH for DRO and GRO, andmetals. If contaminants were detected above screening levels, or the TPH action levelduring initial confirmation sampling, the tank-hold was over-excavated to removeadditional soil and then resampled.

All sites except B2480 had analytical results less than EPA Region VI Human Health Medium- Specific Screening Levels (MSSLs) for residential exposure and TPH levels less than 100mg/ kg. The B2480 site had a TPH result in excess of 200 ppm; however, this site wasconsidered as requiring no further action due to its location in the Enclave Area andbecause the planned reuse is industrial.

2.2.2.4 Summary of Site Risks

Excavated soils with TPH concentrations less than 100 mg/kg were used as permissiblebackfill. Conditions at all OWS locations are acceptable for residential reuse with theexception of B2480. Conditions at B2480 are compatible with industrial reuse.

Final individual closure reports for each separator were submitted to the ADEQ, RSTDivision, where “no further action” was determined for the associated USTs. This site doesnot pose unacceptable risk to human health or the environment. No CERCLA-relatedrestriction on land use is required since all screening/cleanup levels were compatible forresidential reuse with the exception of the OWS located at B2480. However, this locationis within the Enclave Area retained by the Army.

2.2.3 Site FTCH-035, USTs (Excess Area and Enclave Area)

2.2.3.1 Site Location and Description

Site FTCH-035: USTs, Enclave Area (B473, B1916, B2037, B2219, B2350, & B2520); Excess Area (B145, B402, B403, B3670, & B5830).

Enclave Area: This site includes UST facilities at locations along 1st Avenue (Figure 2)and inactive aboveground storage tanks (ASTs) at B473. Building 473 had 5 tanks on standsinstalled in 1943 for diesel and gasoline storage. Building 1916 had 6 tanks installed in1942 for diesel storage. Building 2037 had 6 tanks installed in 1942 for diesel storageand later replaced in 1983. Building 2219 had 6 tanks installed in 1942 for gasolinestorage and later replaced in 1983. Building 2350 had 9 tanks for gasoline storage andlater replaced in 1983. Building 2520 had 2 tanks installed in 1942 for motor fuelsdistribution.

Excess Area: This site includes several UST facilities. Site B145 is located near theintersection of Chaffee Boulevard and Fort Smith Boulevard. Three fuel tanks were locatedat B145, formerly the Post Exchange Service Station. Site B402/B403 is located east ofTerry Street between Roberts Boulevard and Darby Avenue. Site B402 was used for dieselfuel storage; B403 was used for gasoline storage. Both tanks were installed in 1955. SiteB3670 is located north of Arkansas Boulevard, south of 4th Hospital Street and StorehouseRoad. Two tanks were installed at B3670 in 1955 for diesel fuel storage. Site B5830 islocated north of Free Boulevard, on the west side of 9th Avenue. This site had 2 tanksinstalled in 1979 for storage of aviation fuel.

2.2.3.2 Site History and Enforcement Activities

All tanks at the 11 locations were removed and disposed of off-site. In each case, eitherborehole samples or soil excavation samples were analyzed for VOCs, SVOCs, and TPH forboth gasoline and diesel components. Site assessment activities were documented in closurereports to the ADEQ RST Division. A summary of RST determinations for the UST sites is asfollows:

Site FTCH-035 USTs RST No Further Action/Assessment Determinations

B402/403 (Excess Area) No further action and case file closure was determined by RSTDivision per correspondence dated December 7, 1998.

B5830 (Excess Area) No further action and case file closure was determined by RST Division per correspondence dated November 30, 1998.

B3670 (Excess Area) No further action and case file closure was determined by RST Division per correspondence dated December 8, 1997.

B145 (Excess Area) No further action and case file closure was determined by RST Division per correspondence dated January 6, 1997.

B473 (Enclave Area) No further action and case file closure was determined by RST Division per correspondence dated August 13, 1998.

B1916 (Enclave Area) No further assessment was determined by RST Division per correspondence dated August 24, 1998.

B2037 (Enclave Area) No further action and case file closure was determined by RST Division per correspondence dated July 28, 1998.

B2219 (Enclave Area) No further action and case file closure was determined by RST Division per correspondence dated October 9, 1997.

B2350 (Enclave Area) No further action and case file closure was determined by RST Division per correspondence dated June 13, 1997.

B2520 (Enclave Area) No further assessment was determined by RST Division per correspondence dated August 24, 1998.

2.2.3.3 Site Characteristics

Assessment soil samples did not contain any contaminant concentration in excess of thoseallowed by the ADEQ RST Division. Excavations were backfilled with imported fill and withoverburden having less than 100 mg/kg of TPH as confirmed by field immunoassay tests.Groundwater samples were collected at B2219, B402/403, B3670, and B5830. Detectedpetroleum contaminants were at levels considered protective of human health and theenvironment based on RST Division evaluations and risk assessment reviews.

2.2.3.4 Summary of Site Risks

These sites have been successfully remediated or verified as having residual levelsprotective of human health and the environment. The ADEQ RST Division concurs andconsiders these sites as requiring no further action or no further assessment pendingformal closure. Site FTCH-035 locations do not present unacceptable risk to human healthand the environment. No CERCLA-related restriction on land use is required since allscreening/ cleanup levels were compatible with residential reuse with the exception of theUST located at B2219. This location is within the Enclave Area retained by the Army.

2.2.4 Site FTCH-036, 9th Avenue USTs, WA-1, -2, -4, -5, -6. -7 and B5524 (Excess Area)

2.2.4.1 Site Location and Description

This site includes 7 inactive UST locations noted as B5524, WA-1, WA-2, WA-4, WA-5, WA-6, and WA-7 (Figure 2). B5524 is located west of WA-1, just east of 10th Avenue. WA-1 islocated in a grassy area on the east side of 9th Avenue. The rest of the tanks are southalong 9th Avenue. The tanks were used for either gasoline or diesel storage.

2.2.4.2 Site History and Enforcement Activities

WA tanks were installed in 1943. The B5524 tanks were installed in 1955. A 1989investigation collected information on tank contents and analyzed soil borings forbenzene, toluene, ethylbenzene, and xylenes (BTEX) as well as TPH and lead. In 1991 theUSTs were removed. Analytical data for tank removals in 1991 was available only for B5524(Facilities Management Office-Environmental [FMOE], 1995).

2.2.4.3 Site Characteristics

Analytical data was available from the 1991 B5524 tank removal. Therefore, in May 1997,soilboring samples were taken at each inactive UST location with the exception of B5524.The soil samples were analyzed for VOCs and TPH for both diesel and gasoline components.The presence of methylene chloride in the soil samples is attributed to laboratory solventuse and subsequent analytical detection. The diesel range TPH results for Sites WA- 1 andWA- 4 were well below closure guidelines. All other samples had TPH concentrations lessthan detection limit.

2.2.4.4 Summary of Site Risks

There is no evidence of contamination at any of the former UST sites that warrants furtheraction. No further action was determined for WA-1, -2, -4, -5, -6, and -7 by the RSTDivision per correspondence dated January 20, 1998. No further action was determined forB5524 by the RST Division per correspondence dated April 2, 1997.

The site does not present unacceptable risk to human health and the environment, and no CERCLA-related restriction on land use is required.

2.2.5 Site FTCH-038, USTs, B428 (Excess Area)

2.2.5.1 Site Location and Description

This site is located at B428 on the north corner of Roberts Boulevard and Ellis Street. Atone time, the facility contained a 12,000-gallon UST used to store gasoline and perhapsdiesel fuel.

2.2.5.2 Site History and Enforcement Activities

This tank was installed in 1945 to store gasoline. Due to a lack of need, the tank wasdeemed inactive and was removed in 1991. In June 1998 soil samples were collected fromborings at the former location of the tank, hydrologically downgradient from the tankhold,and near the former building where a tank suction line had run. Soil samples were analyzedfor VOCs, SVOCs, and TPH for both gasoline and diesel constituents. The only parametersdetected were diesel constituents and 5 SVOCs at a depth of 7.5 to 9.0 feet in a boringnear Ellis Street.

2.2.5.3 Site Characteristics

The 1998 analytical results indicate TPH diesel range results were below state RSTDivision screening levels of 100 mg/kg. With the exception of benzo (a) anthracene, allSVOCs were below residential screening levels. Benzo (a) anthracene, while slightly aboveresidential screening levels, was consistent in depth and concentration where Tier 2 RiskEvaluation was applied at another UST site. The RST Division had performed this riskanalysis and no site specific target levels for future residential use were exceeded.

2.2.5.4 Summary of Site Risks

A no further action determination was made for Site FTCH-038 by the RST Division per correspondence dated August 13, 1998.

No contamination warranting further action is present at the site. The site does not posean unacceptable risk to human health and the environment, and no CERCLA-relatedrestriction on land use is required.

2.3 GROUP III-C, MISCELLANEOUS SITES

2.3.1 Site FTCH-009, DDT Storage Area (Excess Area)

2.3.1.1 Site Location and Description

This site is located north of the intersection of Roberts Boulevard and Chaffee Boulevardin a warehouse area approximately 70 feet off Chaffee Boulevard (Figure 3). Building 314,the surrounding lot, and the rear-area drainage ditch made up the DDT storage area.Building 314 was a structure of 25 open-front sheds or bays with unbermed earthen floors.Excess DDT was stored in 55-gallon drums stacked on wooden pallets in Bay 11 of B314 frombefore 1966 through 1979.

2.3.1.2 Site History and Enforcement Activities

Over time, the drums in Bay 11 corroded and leaked. The DDT-contaminated surface soils inBay 11, nine adjacent bays, and the drainage ditch behind B314. As a conservativeapproach, the ADEQ recommended that EPA Region VI Human Health MSSLs serve as actionlevels. Project cleanup activities included removal of B314, excavation ofDDT-contaminated soils at the site and in the drainage ditch for off site treatment anddisposal, groundwater monitoring, confirmation sampling, and site restoration. With theexception of the Bay 11 area, contamination penetrated only the upper 4 to 6 inches ofsurface soil. The excavation of grids in the vicinity of Bay 11 went to a depth of 8.5feet. Approximately 1,425 tons of excavated soils were transported off site for treatment and disposal. Excavated areas were backfilled and graded with clean material.

2.3.1.3 Site Characteristics

Based on the results of the confirmation sampling and analyses for the former DDT StorageArea, the site has been remediated to below the EPA screening level for DDT-contaminatedsoil in residential land use. Use of this screening value as an action level was aconservative approach to assure protection of human health and the environment.

The results of post-remediation monitoring well sample analytical tests were all belowdetection limits for pesticides, VOCs, and SVOCs with the exception of one sample thatmeasured a 4,4'-DDT concentration at the analytical detection level. These results confirmthat the potential for groundwater contamination has been eliminated.

2.3.1.4 Summary of Site Risks

The extensive excavation of soils followed by confirmatory sampling show the site has been remediated below EPA screening levels for residential land use. The site does not present unacceptable risk to human health and the environment, and no CERCLA-related restrictionon land use is required.

2.3.2 Site FTCH-016, Wood/Burnable Disposal Site (Excess Area)

2.3.2.1 Site Location and Description

Site FTCH-016, approximately 20 acres in area, is located on the west end of Fort Chaffee(Figure 3). About 18 to 20 acres were used for disposal operations. Fifteen to 17 acres inthe northern portion of the site were used for burial disposal and three acres in thesouthern portion were used for burn and cover operations and minimal burial disposal. Thesite, in the Excess Area, is to be transferred as part of the BRAC process.

2.3.2.2 Site History and Enforcement Activities

The site was used between 1972 and 1985. The southern portion of the site was backfilledand graded in 1987. No type or quantity records exist for disposed materials. In 1988, theUS Army Environmental Hygiene Agency evaluated the southern portion of the site. Groundwater was sampled and analyzed for VOCs, SVOCs, pesticides, explosives, herbicides, PCBs,and metals. The analytical results indicated there was no release of hazardousconstituents to ground water. In 1997 samples were collected from surface soil, subsurfacesoil, and ground water. An electromagnetic survey aided the selection of sample locations.All samples were analyzed for VOCs, SVOCs, organochlorine pesticides, PCBs, chlorinatedherbicides, and metals. Ground water was resampled and analyzed in 1998. Site FTCH-016 wasincluded in the United States Army Corps of Engineers Ordnance and Explosives (O&E)archives search of Fort Chaffee records (USACE, 1999). The findings of the Archives SearchReport confirmed that no operation and training involved in O&E occurred at the site.

2.3.2.3 Site Characteristics

Per the 1997 analytical results, there are no contaminants of concern in surface orsubsurface soils. No VOCs, organochlorine pesticides, PCBs, or herbicides were found inany 1997 surface soil samples above laboratory detection limits. Only one SVOC, di-n-butylphthalate, was found at a concentration slightly above the laboratory detection limit.This material could be a carrier for pesticides, a plasticizer for polyvinylchloride (PVC)material, or a laboratory contaminant and is not indicative of a site-related release.

There were no organochlorine pesticides, PCBs, VOCs, or herbicides in any subsurfacesoils. An SVOC, di-n-butyl phthalate, was found in one sample at a concentration wellbelow the residential MSSL. Low levels of three VOCs (benzene, toluene, and xylene) weredetected in one soil sample collected at a depth of 15 feet. Concentrations were wellbelow residential MSSLs. The detection of these VOCs was isolated to one sample; the othersubsurface sample taken at the same location at a shallower depth did not contain anymeasurable levels of VOCs. Also, the ground water from this location did not indicate thepresence of any VOCs. The 1997 and 1998 soil analytical data substantiate there has notbeen a site-related release of organic constituents to subsurface soils.

There were no VOCs, SVOCs, organochlorine pesticides, or PCBs found in groundwatermonitoring wells sampled during December 1997. Diclorprop, a chlorinated herbicide, wasmeasured at a low concentration of 5.06 :g/L. During confirmation sampling in 1998, noVOCs, organochlorine pesticides, PCBs, or chlorinated herbicides related to siteactivities were detected above sample quantitation limits in any groundwater sample.Analytical data from both groundwater sampling events indicate that no site-relatedrelease of organic constituents to ground water has occurred. Metal concentrations ingroundwater samples were representative of background conditions.

2.3.2.4 Summary of Site Risks

The investigative results indicate that no release of organic and/or metal contaminants tosite media (soil and ground water) has occurred from past site activities. This site doesnot present unacceptable risk to human health and the environment, and no CERCLA-relatedrestriction on land use is required.

2.3.3 Site FTCH-021, Waste Oil Accumulation Points (Partly Excess Area)

Building Location

Building 262 Site 21A (Excess Area)

Building 423 Site 21B (Excess Area)

Building 421 Site 21C (Excess Area)

Building 2454 Site 21D (Enclave Area)

Building 470 Site 21F (Army Reserves)

Building 2055 Site 21G (Enclave Area)

2.3.3.1 Site Location and Description

This site consists of six building locations in the East and Central cantonment (Figure2). Buildings 2454, 421, 423, and 262 were waste oil accumulation points and Buildings470, and 2055 were HWSAPs. All of the building locations are either former or currentwaste accumulation points for aboveground storage of vehicle maintenance fluids or paintwastes.

2.3.3.2 Site History and Enforcement Activities

Building 262 (Site 21A) was a vehicle maintenance shop, then a storage building forgrounds maintenance equipment. A 300- gallon AST was used to store waste oil. Building 421(Site 21C) is a satellite, waste-oil and drum storage accumulation point. Drums were keptin as well as outside the building. Building 423 (Site 21B) is a maintenance shop, with adrum storage area on the outside of the building. Building 470 (Site 21F) is an artillerymaintenance shop. On each end of the building there were 300-gallon ASTs and some drumscontaining waste-oil. Building 2055 (Site 21G) is a painting shop that uses a waterfallpaint scrubber in its operations. Building 2454 (Site 21D) was a small building that wasused exclusively for waste oil storage. The building has been razed; only the foundation remains. No environmental concerns were noted during a site walkover in 1995.

2.3.3.3 Site Characteristics

In September 1997, surface soil samples, subsurface soil samples, and groundwater sampleswere analyzed for VOCs, SVOCS, and metals. The 1997 analytical results indicate no surfacesoil contamination at any of the six buildings except B2055. Of the surface soils taken atthis location, VOCs and SVOCs were below detectable levels. For metals, lead and zincexceeded background concentrations, but were below screening levels for residential use.Subsurface soil contamination from VOCs was evident at B2454 in borings between 8 and 18feet, but at concentrations less than EPA MSSLs for residential soil use. Two VOCsdetected in one groundwater sample at B2454 were benzene, which was below the maximumcontaminant level (MCL), and methylene chloride, which was attributed to laboratorycontamination. Benzene was not detected during a subsequent groundwater sampling event.

2.3.3.4 Summary of Site Risks

VOCs were detected in soil samples only at Site 21D, Building 2454. The VOCs did notexceed residential MSSLs. No SVOCs were detected in soils at any location. Metals in soilsamples were either consistent with background levels or below residential screeninglevels at all sites. Ground water has not been impacted by site activities. The site doesnot present unacceptable risk to human health and the environment, and no CERCLA-relatedrestriction on land use is required.

2.3.4 Site FTCH-027, Hospital Incinerator (Excess Area)

2.3.4.1 Site Location and Description

This site is located in the old hospital area south of 4th Hospital Street at B3671(Figure 3). A small incinerator was used for the destruction of potentially pathogenichospital wastes. The incinerator was approximately 4 feet tall, 2.5 feet wide and 3.5 feetlong.

2.3.4.2 Site History and Enforcement Activities

Building 3671 and the incinerator were used primarily from 1941 to the mid-1960s. During asite visit in 1995, it was noted that the incinerator had been partially dismantled, andthe building grounds were overgrown with tall grasses and brush (ERM, 1996). No ash wasobserved outside the building. In May 1998 two incinerator ash samples and two surfacesoil samples were analyzed for 25 metals. In July 1998, residual ash from the incineratorwas shipped to an approved disposal facility in Utah. An asbestos abatement contractorremoved asbestos material lining the incinerator during October 1998. The incinerator wasremoved and shipped to a local metal recycling facility for disposal.

2.3.4.3 Site Characteristics

Normal housekeeping performed at the military medical facility precluded disposal of ashto the surrounding grounds. Two surface soil samples were obtained and analyzed formetals. Metals were detected in site soils and were representative of background levelsexcept for lead and zinc. Lead was detected at 207 mg/kg and 543 mg/kg. Zinc was detectedat 320 mg/kg and 356 mg/kg. The lead and zinc may be attributable to weathered lead- basedpaint from nearby buildings, but the issue of lead-based paint in soil will be addressedseparately from this document. Based on soil sample results and the comparison to ashresults, no release of contaminants occurred from the incinerator operations.

2.3.4.4 Summary of Site Risks

No release of hazardous substances was detected at this site. Metals were detected in sitesoils, but concentrations are considered unrelated to incineration ash disposal based oncomparative data. The site does not present unacceptable risk to human health and theenvironment, and no CERCLA-related restriction on land use is required.

2.3.5 Site FTCH-033, Oil/Water Separator Sludge Disposal Area (Excess Area)

2.3.5.1 Site Location and Description

Site FTCH-033 is located northeast of the cantonment area, north of a natural gas welllocated along a gravel vehicle path (Figure 3). The site, in the Excess Area, is to betransferred as part of the BRAC process.

2.3.5.2 Site History and Enforcement Activities

Between 1988 and 1990, sediments and sludge collected from vehicle wash rack troughs andrelated OWSs were spread evenly on the ground surface at the site. In 1990 an RFArecommended no further investigation for the site. In 1996 the site was inspected as partof an environmental baseline survey and found covered in tall grasses and brush with noobvious signs of material disposal. In 1997 surface soil, subsurface soil, and groundwatersamples were analyzed for VOCs, SVOCs, and 25 metals.

2.3.5.3 Site Characteristics

No VOCs or SVOCs were detected in surface soil, subsurface soil or ground water. Detectedmetals are consistent with background levels and considered naturally occurring. There isno evidence of a hazardous waste release from this site.

2.3.5.4 Summary of Site Risks

No contamination indicating a release is evident at this site. The site does not presentunacceptable risk to human health and the environment, and no CERCLA-related restrictionon land use is required.

2.3.6 Site FTCH-039, Oil Trenches Site, OTS (Enclave Area)

2.3.6.1 Site Location and Description

The OTS is located 0.3 miles east of First Avenue and north of Roberts Boulevard. Theareas adjacent to the site are mixed forests and meadowland.

The site consists of four trenches. Trench 1 was approximately 24.5 feet long and 3.5 to 8feet wide. Trench 2 was 32.6 feet long and 3.5 feet wide. Trench 3 was approximately 47feet long and 4 to 6 feet wide. Trench 4 was about 8 feet long and 4 feet wide. Thesetrenches were used for the disposal of petroleum hydrocarbons from base operations priorto 1976.

2.3.6.2 Site History and Enforcement Activities

Management of the site warranted removal of oil-contaminated soil and replacing it withclean backfill. Before excavation of the trenches, 6 inches of soil was removed from theground surface between the four trenches. Trench excavation and soil analyses byimmunoassay tests for petroleum hydrocarbons took place in December 1997.

Based on the field screening results and per agreement with the EPA, Region VI, Trenches 1and 2 were excavated to remove soils visibly stained with petroleum hydrocarbons and toallow natural attenuation to address the remaining contaminants. Besides excavating 5-footdepths for Trenches 1 and 2, sloped sidewalls were also excavated for safety andover-excavation of material.

Trenches 3 and 4 were excavated to approximately 1 foot in depth. Soil samples werecollected after each excavation increment and were analyzed in the field by theimmunoassay method.

When the immunoassay results indicated remaining soils in the trench contained less than100 mg/kg petroleum hydrocarbons, confirmation samples were analyzed for GRO and DROpetroleum hydrocarbons.

Confirmation sampling at Trenches 3 and 4 corroborated the removal of contaminated soil tobelow the 100 mg/kg cleanup criteria.

Approximately 135 cubic yards of excavated material was transported off-site to approvedlandfills. All trenches were backfilled with clean fill material.

2.3.6.3 Site Characteristics

TPH analyses were used to confirm that excavation of contaminated material was successfuland that the remaining soil at the base of trenches contained less than 100 mg/kgpetroleum hydrocarbons. This clean up level was not achieved in Trenches 1 and 2 althoughall visibly stained material was removed to a depth of 5 feet in addition to over-excavation of soil burden on trench sidewalls. Residual petroleum contamination wasminimized to allow natural attenuation to occur. Trenches were backfilled with soilcontaining petroleum hydrocarbons concentrations of less than 100 mg/kg and imported cleanfill. The overexcavation of visibly impacted soils and backfilling with soils containingless than 100 mg/kg TPH, have eliminated all exposure pathways.

In November 1997, naphthalene was detected at low concentrations in nearby monitoringwells MWO3 (4.72 :g/L) and MW04 (1.71 :g/L) before remedial excavation work. In April

1998, after the trenches were excavated and backfilled, naphthalene was measured at 2.23:g/L in MW03. The results for monitoring well MW04 results were below the analyticaldetection limit of 1 :g/L.

2.3.6.4 Summary of Site Risks

The excavation and clean backfill of the oil disposal trenches has eliminated thepotential for exposure to contaminant contact in surface soil and storm water run- off.The groundwater monitoring results, slightly above or at analytical detection limits,indicate that the remedial excavation activity was protective of the environment. Thissite does not present an unacceptable risk to human health and the environment, and noCERCLA-related restriction on land use is required.

2.3.7 Site FTCH-042A, Pesticide Handling Area B540 (Excess Area)

2.3.7.1 Site Location and Description

This site, a pesticide storage and mixing facility at B540, is located southwest ofRoberts Boulevard (Figure 3). The site is no longer in use.

2.3.7.2 Site History and Enforcement Activities

This area had operated since the late 1970s. Drums were stored in a secondary containmentarea and mixing activities took place on concrete mixing pads adjacent to the building. Nopesticides were disposed through the building drainage system. Floor drains in thebuilding are sealed and the drain discharge holding tank is gone. Previous reports notedno evidence of release to the environment (ERM, 1996). In 1998 surface soil samples werecollected near outside storage areas and drainage pathways adjacent to the site.Groundwater samples were collected from monitoring wells.

2.3.7.3 Site Characteristics

No VOCs, SVOCs, PCBs, or organophosphorus pesticides were detected in the 1998 surface and subsurface soil samples. Organochlorine pesticides were present in some samples but all concentrations were below EPA soil screening limits for residential exposure. There wereno SVOCs, organochlorine pesticides, or PCBs detected in groundwater samples.

An orthophosphorus pesticide was initially reported in the first round of groundwatersampling, but was not reported in any wells during confirmation sampling. Metals detectedin the ground water are considered naturally occurring. The only chlorinated herbicidedetected was dicamba at a low concentration of 0.31 :g/L in one monitoring well. It wasnot detected in any other site monitoring well and is not considered representative of arelease.

No chemical constituents detected in the surface soil, subsurface soil, or groundwatersamples exceed the associated residential exposure screening levels for soil samples orrecommended MCLs for groundwater samples.

None of the constituents detected in soils were reported in groundwater samples,indicating that these constituents have not migrated into ground water.

2.3.7.4 Summary of Site Risks

The detected levels of organochlorine pesticides concentrations are below residential soilscreening levels and all contaminants of potential concern were reported below MCLs forgroundwater samples. The site does not present an unacceptable risk to human health andthe environment, and no CERCLA-related restriction on land use is required.

2.4 COMMUNITY PARTICIPATION

The proposed alternative for the nineteen sites in this ROD was summarized in a publicnotice published in local newspapers as noted in the following table. The notice alsoannounced the availability of the Proposed Plan of Action, the location of supportingdocuments and the public open house held on February 10, 1999. The Proposed Plan of Actionincluded twenty-one sites, nineteen of which are addressed in this ROD for no furtheraction. Site FTCH-012, Hazardous Waste Satellite Accumulation Point and Site FTCH-017,Vehicle Washrack Ditches will be addressed in a subsequent Record of Decision. Theproposed plan has also been presented to and discussed with the Fort Chaffee RestorationAdvisory Board (RAB). The public forum included informational displays and afforded anopportunity for interested stakeholders to ask questions and/or comment to Army personnel.The public comment period ended on March 12, 1999. No written or verbal commentsconcerning the Proposed Plan have been received from the community.

Newspaper Location Publication Dates

Arkansas Democrat Gazette Little Rock, AR January 27, 1999 February 7, 1999 February 10, 1999

Charleston Express Charleston, AR January 27, 1999 February 3, 1999 February 10, 1999

Little River News Ashdown, AR January 28, 1999 February 4, 1999

Southwest Times Record Fort Smith, AR January 27, 1999 February 7, 1999 February 10, 1999

2.5 SCOPE AND ROLE OF RESPONSE ACTION

This decision document is the third of a series for Fort Chaffee documenting completion ofrequired CERCLA response activities for the installation. The United States Army FCBTT inconjunction with other members of the BRAC Clean- up Team (representatives of ADEQ, USEPARegion 6) have cooperatively developed a plan to periodically document attainment of allrequirements for the sites at Fort Chaffee. This decision document will record in theadministrative record concurrence between the lead and support agencies that CERCLAresponse actions required by the United States Army relative to Fort Chaffee have beencompleted for the included sites.

2.6 EXPLANATION OF SIGNIFICANT CHANGES

The decisions presented in this document do not differ significantly from those presentedin the Proposed Plan of Action dated February 1999.

3.0 RESPONSIVENESS SUMMARY

No verbal or written comments concerning the proposed decision were received during thepublic comment period from the community.

4.0 REFERENCES

Administrative Record, Fort Chaffee, Arkansas. Copies can be found at Fort Chaffee,Building 2033, 1st Avenue, Barling, Arkansas, 72923, and at the Fort Smith Public Library,61 South 8th Street, Fort Smith, Arkansas, 72901.

ERM, 1996. Environmental Baseline Survey at Army Base Realignment and Closure (BRAC) 95 Installations. Prepared by ERM Program Management Company. October 1996.

FMOE, 1995. Review of Fort Chaffee Environmental Permits. Facilities Management Office- Environmental, Camp Robinson. October 1995.

USACE, 1989. Underground Storage Tanks Not In Use, Specifications for UST Removal, Pre-Final Report (90%). USACE, Little Rock District. November 1989.

USACE, 1999. U. S. Department of Defense Base Realignment and Closure Ordnance and Explosives Archives Search Report, Findings, Fort Chaffee. April 1999.

USAEHA, 1988a. Hazardous Waste Consultation No. 37-26-1380-89, Evaluation of Solid WasteManagement Units. November, 1988.

USAEHA, 1988b. Geohydrologic Study No. 38-26-0337-89, Fort Chaffee, Arkansas. 30 November– 13 December 1988.

USAEHA, 1988c. Geohydrologic Study No. 38-26-8818-90, RCRA Facility Assessment Investigation, Fort Chaffee, Arkansas, 28 November – 15 December 1988.

USEPA, 1990. RCRA Facility Assessment Report, Fort Chaffee Army Garrison, AR 9210020187, Fort Smith, Arkansas. Prepared by PRC Environmental Management, Inc. August, 1990.

Record of Decision 24 of 28 December 13, 1999No Further Action Group III Environmental SitesUnited States Army Base Transition TeamFort Chaffee, Arkansas

Table 1Land Use Summary

Group III Sites - Excess AreaFort Chaffee, Arkansas

SITES DESCRIPTION PROPOSED USE1

HUMAN HEALTHSCREENING/

CLEANUP LEVELHISTORICALLAND USE

FTCH-009 DDT Storage Area Residential Residential IndustrialFTCH-016 Wood/Burnable Disposal Site Commercial/office/retail/parks-open

spaceResidential Military

Training /Industrial

FTCH-019 Waste Oil Storage Tanks WA-3 Business Park/Campus Residential IndustrialFTCH-021A Waste Oil Accumulation Point, B262 Residential Residential IndustrialFTCH-021B Waste Oil Accumulation Point, B423 Light / Business Industrial Residential IndustrialFTCH-021C Waste Oil Accumulation Point, B421 Light / Business Industrial Residential IndustrialFTCH-023 DRMO Hazardous Waste Storage Area B339 Residential Residential IndustrialFTCH-027 Army Hospital Incinerator B3671 Business Park/Campus Residential IndustrialFTCH-033 Oil/Water Separator Sludge Disposal Area Game and Fish Lease Residential Military

Training /Industrial

FTCH-034 Oil/Water Separator and Associated USTsBldg 5866 Residential Residential IndustrialBldg 5566 Residential Residential IndustrialBldg 429 Light / Business Industrial Residential IndustrialBldg 262 Buffer zone for flood area Residential IndustrialBldg 1827 Commercial / Office / Retail Residential IndustrialBldg 1828 Commercial / Office / Retail Residential IndustrialBldg 1912 Light / Business Industrial Residential IndustrialBldg 1939 Light / Business Industrial Residential IndustrialBldg 1980 Light / Business Industrial Residential IndustrialBldg 2020 Light / Business Industrial Residential IndustrialBldg 2035 Light / Business Industrial Residential Industrial

Record of Decision 25 of 28 December 13, 1999No Further Action Group III Environmental SitesUnited States Army Base Transition TeamFort Chaffee, Arkansas

Table 1 (continued)Land Use Summary

Group III Sites - Excess AreaFort Chaffee, Arkansas

SITES DESCRIPTION PROPOSED USE1

HUMAN HEALTHSCREENING/

CLEANUP LEVELHISTORICALLAND USE

FTCH-035 Underground Storage TanksBldg 145 Residential Residential IndustrialBldg 5830 Residential Residential IndustrialBldg 402 / 403 Light / Business Industrial Residential IndustrialBldg 3670 Business Park / Campus Residential Industrial

FTCH-036 Ninth Avenue Underground Storage TanksBldg 5524 Residential Residential IndustrialBldg 5570 (West Area 1) Commercial / Office / Retail Residential IndustrialBldg 5578 (West Area 2) Business Park / Campus Residential IndustrialBldg 5773 (West Area 4) Light / Business Industrial Residential IndustrialBldg 5772 (West Area 5) Light / Business Industrial Residential IndustrialBldg 5890 (West Area 6) Light / Business Industrial Residential IndustrialBldg 5950 (West Area 7) Light / Business Industrial Residential Industrial

FTCH-038 Building 428 Underground Storage Tank Light / Business Industrial Residential IndustrialFTCH-042A Pesticide Handling Areas B540 Parks/Open Space/Flood Plain Residential Industrial

1Proposed use according to Fort Chaffee Public Trust Comprehensive Reuse Plan

Record of Decision 26 of 28 December 13, 1999No Further Action Group III Environmental SitesUnited States Army Base Transition TeamFort Chaffee, Arkansas

Table 2Ecological Risk Summary

Group III SitesFort Chaffee, Arkansas

SITE REMEDIALSTATUS

ECOLOGICALSTATUS

DECISION COMMENTS

FTCH-009, DDT Storage Area RA EcologicallyIrrelevant

NFA - NLUC Potential pathway has been eliminated by removal of contaminatedsoil. Site has also been covered with 2-6" of fill.

FTCH-016, Wood/BurnableDisposal Site

RI No site-relatedreleases

NFA - NLUC None.

FTCH-019, Waste Oil StorageTanks WA-3

RA EcologicallyIrrelevant

NFA - NLUC UST removal under RST Division of ADEQ. Residual contaminationdetected at depths of 4.5' to 8.0' below ground surface. Noexposure pathway.

FTCH-020, Open Burn, OpenDetonation

C EcologicallyIrrelevant

NFA - NLUC This site was clean closed under RCRA and has received ADEQclosure approval.

FTCH-021A, Waste OilAccumulation Point, B262

Rl No site-relatedreleases

NFA - NLUC Detections of Zn, Cd, and Pb occurred adjacent to the structure andare attributed to weathering of painted surfaces and metals siding.

FTCH-021B, Waste OilAccumulation Point, B423

RI No site-relatedreleases

NFA - NLUC Detection of Pb in surface soils attributed to weathering of paintedsurfaces.

FTCH-021C, Waste OilAccumulation Point, B421

RI No site-relatedreleases

NFA - NLUC Detections of Cd, Pb and Zn in surface soils attributed toweathering of painted surfaces and fencing. Although the Cd (1.63mg/Kg) barely exceeds the maximum measured backgroundconcentrations, it may be related to anthropogenic sources.

FTCH-021D, Waste OilAccumulation Point, B2454

Rl EcologicallyIrrelevant

NFA - NLUC Detections of Pb and Cd in surface soil occurred adjacent to thestructure and are attributed to weathering of painted surfaces.VOCs and metals in subsurface soils were detected at 4' belowground surface or deeper. No exposure pathway.

FTCH-021F, Waste OilAccumulation Point, B470

Rl No site-relatedreleases

NFA - NLUC Detections of Cd in soil (1.6 mg/kg) barely exceed maximummeasured background levels and are not believed related to siteactivities. Regardless, these low levels are not considered harmfulto the environment.

FTCH-021G, Waste OilAccumulation Point, B2055

Rl EcologicallyIrrelevant

NFA - NLUC Detection of Pb in surface soil is of limited distribution.Nevertheless, the potential for ecological impact is negligible sincethe location is covered with gravel and there is limited exposurepathway.

Record of Decision 27 of 28 December 13, 1999No Further Action Group III Environmental SitesUnited States Army Base Transition TeamFort Chaffee, Arkansas

Table 2 (continued)Ecological Risk Summary

Group III SitesFort Chaffee, Arkansas

SITE REMEDIALSTATUS

ECOLOGICALSTATUS

DECISION COMMENTS

FTCH-023, DRMO HazardousWaste Storage Area, B339

C No site-relatedreleases

NFA - NLUC Site was clean closed under RCRA and has received ADEQ closureapproval. Pesticide detects due to use as intended; detections of Pbin soils occurred adjacent to the structure and are attributed toweathering of painted surfaces.

FTCH-027, Hospital Incinerator RI No site-relatedreleases

NFA - NLUC Detections of metals in soils attributed to weathering of paintedsurfaces and metal siding since the assemblage of metals found Inthe soil differs markedly from that of the ash. Incinerator ash wasremoved and disposed off-site.

FTCH-033, Oil/Water SeparatorSludge Disposal Area

RI No site-relatedreleases

NFA - NLUC None

FTCH-034, Oil/Water Separator RST EcologicallyIrrelevant

NFA - NLUC UST removals under RST Division of ADEQ. Residualcontamination measured from composite subsurface soil samples inwhich the shallowest component was at 1.5' (one location) to 3.5'below ground surface extending to depths of 18' below groundsurface. No exposure pathway.

FTCH-035, USTs B145,B402/B403, B5830, B3670,B473, B1916, B2037, B2350,B2219, B2520

RST EcologicallyIrrelevant

NFA - NLUC UST removals under RST Division of ADEQ. Residualcontamination measured from composite subsurface soil samples ofthe tankhold sidewall in which the shallowest component was takenat 1.5' (one location) to 4.5' extending to depths of 14' below groundsurface. Investigations of inactive UST sites show residualcontamination detected at 4' below ground surface or deeper. Noexposure pathway.

FTCH-036, 9th Ave USTs WA1-7 and B5524

RST Ecologically Irrelevant

NFA - NLUC UST removals under RST Division of ADEQ. Residualcontamination detected at depths of 4.5' to 7.0' below groundsurface. No exposure pathway.

FTCH-038, B428 RST EcologicallyIrrelevant

NFA - NLUC UST removals under RST Division of ADEQ. Residualcontamination detected at a depth of 7.5' below ground surface. Noexposure pathway.

FTCH-039, Oil Trenches RA EcologicallyIrrelevant

NFA - NLUC Oil contaminated soil was removed from four trenches. Thetrenches were filled with clean soil. No exposure pathway.

Record of Decision 28 of 28 December 13, 1999No Further Action Group III Environmental SitesUnited States Army Base Transition TeamFort Chaffee, Arkansas

Table 2 (continued)Ecological Risk Summary

Group III SitesFort Chaffee, Arkansas

SITE REMEDIALSTATUS

ECOLOGICALSTATUS

DECISION COMMENTS

FTCH-042A, PesticideHandling Areas B540

RI No site-relatedreleases

NFA - NLUC Chlordane detections along drip-line believed related to intendeduse. Nevertheless, the potential for ecological impact is negligiblesince the site is covered with gravel and there is limited exposurepathway.

ADEQ: Arkansas Department of Environmental Quality C: Closure mg/kg: milligrams per kilogram NFA: No Further Action NLUC: No Land Use Controls RA: Removal/Remedial Action RI: Remedial Investigation RST: Regulated Storage Tank UST: underground storage tank VOC: volatile organic compound


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