HAZARD RANKING SYSTEM (HRS)

DOCUMENTATION RECORD - REVIEW COVER SHEET

Name of Site: MacMillan Ring Free Oil

EPA ID No.: ARD008049207 

Contact Persons 

Site Investigation: Brenda Nixon Cook, NPL Coordinator, EPA Reg.6 (214) 665-7436 

 (Name) (Telephone) 

Documentation Record: Brenda Nixon Cook, NPL Coordinator, EPA Reg.6 (214) 665-7436 

 (Name) (Telephone) 

 

Pathways, Components, or Threats Not Scored

Although the surface water migration pathway score is sufficient to list the site, contamination in other 

media has been identified that may pose a threat to human health and the environment and may be 

evaluated in the future (Ref. 5). 

1) Ground Water Pathway: The ground water migration pathway has not been scored because, 

based on information available at this time, scoring of the ground water migration pathway 

would not significantly affect the listing decision (Ref. 1, Sec. 2.2.3). 

2) Soil Exposure Pathway: The soil exposure pathway has not been scored. Based on information 

available at this time, evaluation of the soil exposure pathway would not affect the listing 

decision (Ref. 1, Sec. 2.2.3). 

3) Air Pathway: The air migration pathway has not been scored. Based on information available 

at this time, evaluation of the air migration pathway would not affect the listing decision

(Ref. 1, Sec. 2.2.3). 

4) Surface Water Pathway: The Surface Water Pathway has been scored for the Human Food 

Chain Threat and Environmental Threat. The drinking water threat has not been scored. Based 

on information available at this time, evaluation of the drinking water threat would not affect 

the listing decision (Ref. 1, Sec. 2.2.3). 

HRS Documentation Record MacMillan Ring Free Oil

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HRS Documentation Record 1 MacMillan Ring Free Oil

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HRS DOCUMENTATION RECORD

Name of Site: MacMillan Ring Free Oil

Site Spill Identifier No.: 063T 

CERCLIS Site ID No.: ARD008049207 

EPA Region: 6 

Date Prepared: December 2013

Street Address of Site: MacMillan Road off Arkansas Highway 335* 

City, County, and State: Norphlet, Union County, Arkansas 71759* 

General Location

within the State: The site is located in the City of Norphlet, Union County, 

Arkansas. Norphlet is located in south-central Arkansas (Ref. 3, p. 1). 

Topographic Map(s): The following U.S. Geological Survey (USGS) 7.5-minute 

topographic series map was used in locating the site: Smackover, 

Arkansas (1962) (Ref. 3, p. 1). 

Latitude/Longitude*: 33° 18’ 30.096” N, 92° 39’ 24.769” W 

Latitude and Longitude coordinates were measured from the northern side of Source 2 where Ponds 

705-707 were historically located and were determined using a scaled topographic map and 

Geographic Information System (GIS) software (Ref. 4, pp. 1-2). 

 

 Scores

 

 Air Pathway Not Scored

 Ground Water Pathway Not Scored

 Soil Exposure Pathway Not Scored

Surface Water Pathway 100.00 

 HRS SITE SCORE 50.00

*The street address, coordinates, and contaminant locations presented in this HRS Documentation Record identify the general area the 

site is located. They represent one or more locations EPA considers to be part of the site based on the screening information EPA used to 

evaluate the site for NPL listing. E PA lists national priorities among the known "releases or threatened releases" of hazardous 

substances; thus, the focus is on the release, not precisely delineated boundaries. A site is defined as where a hazardous substance has 

been "deposited, stored, disposed, or placed, or has otherwise come to be located." Generally, HRS scoring and the subsequent listing of 

a release merely represent the initial determination that a cer tain area may need to be addressed under CERCLA. Accordingly, EPA 

contemplates that the preliminary description of property boundaries at the time of scoring will be refined as more information is 

developed as to where the contamination has come to be located.
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NOTES TO THE READER

1. The following rule applies when citing references in this documentation record: 

Tracking numbers are assigned by the region to every page of every reference. The tracking 

number consists of the reference number followed by the page number within that reference. A 

tracking number has a two-digit number followed by the sequential number (e.g., Reference 4, 

page 1 is expressed as 040001in Reference 4). 

2. Hazardous substances are listed by the names used in the January 2004 (with March 2012 

update) Superfund Chemical Data Matrix (SCDM) (Ref. 2). 

 

3. Attachment A of this documentation record consists of the following figures: 

• A-1 Site Location Map

• A-2 Property Layout Map 

• A-3 Surface Water Pathway Map

• A-4 15-Mile Target Distance Limit

• A-5 Sample Location Map
HRS Documentation Record 3 MacMillan Ring Free Oil

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REFERENCES CITED

1. 40 Code of Federal Regulations (CFR) Part 300, Hazard Ranking System; Final Rule. 14 

December 1990. Volume 55, No. 241. Pages: 1. [A complete copy can be obtained from the 

Regional Docket upon request or found online at 

http://www.epa.gov/superfund/sites/npl/hrsres/index.htm#HRS Rule].

2. U.S. Environmental Protection Agency (EPA). 2004. Superfund Chemical Data Matrix 

(SCDM) (excerpts). January 2004 with updated data factor values from March 2012. Pages: 

20. [A complete copy of SCDM is available at

http://www.epa.gov/superfund/sites/npl/hrsres/tools/scdm.htm].

3. U.S. Geological Survey (USGS) Topographic Maps. 19 62, Smackover, Arkansas; 1962 

(photorevised 1978), Calion, Arkansas; 1981, Harrell Brake, Arkansas (7.5-minute topographic 

series maps). Pages: 3.

4. Weston Solutions, Inc. (WESTON®). 2013. Project Note to File. Calculating the Latitude and 

Longitude coordinates of the Site. 24 July 2013. Pages: 2.

5. WESTON. 2013. T rip Report for MacMillan Ring Free Oil Co. Inc. (excerpts). Norphlet, 

Union County, Arkansas. ARD008049207. 28 May 2013. Pages: 147.

6. Arkansas Department of Environmental Quality (ADEQ). 2011. Comprehensive Site 

Assessment. Norphlet Chemical (MacMillan Ring Free Oil). Norphlet, Union County, AR. 25 

April 2011. Pages: 584.

7. Arkansas Department of Pollution Control and Ecology (ADPC&E). Facility Annual 

Hazardous Waste Report and correspondence between Macmillan Refinery and ADPC&E. 

MacMillan Ring-Free Oil Co. Inc. Norphlet, Arkansas. 31 D ecember 1983, 5 August 1985, 

and 30 October 1987. Pages: 5.

8. EPA. 1986-2004. EPA Region 6 Correspondence. MacMillan Ring Free Oil. 29 July 1986 – 

30 November 2004. Pages: 29. 

9. ADPC&E. 1983-1994. ADPC&E Correspondence. MacMillan Ring Free Oil. N orphlet, 

Union County, Arkansas. 24 February 1983 – 17 October 1994. Pages: 43.

10. ADPC&E. 1990. R CRA Inspection. MacMillan Ring Free Oil. Norphlet, Union County, 

Arkansas. 29 May 1990. Pages: 74. 

11. ADPC&E. 1991. C omprehensive Monitoring Evaluation. N or-Ark Industrial Corp 

(MacMillan Ring Free Oil Site). 24 July 1991. Pages: 116. 

 

12. ADEQ. 2012. State Priority List Summary for NCI Facility. NCI Facility (formerly MacMillan

Ring Free Oil). ARN000606985. October 2012. Pages: 6. 

13. ADPC&E. 1987. NPDES Permit No. AR0000728. Nor-Ark Industrial Corporation (formerly 
MacMillan Ring Free Oil) at 33 deg. 18’ 36” N, 92 deg. 39’ 15” W. Norphlet, Union County, 

Arkansas. 21 September 1987. Pages: 1.

14. Hawkins and Metzger and Wright, Lindsey, & Jennings. 1989 and 1990. Correspondence to 

ADPC&E concerning ownership change. 13 April 1989 and 18 January 1990. Pages: 2. 

15. ADEQ. 2012. Official Photographic Log. Evaluation for NPL Site Visit. Norphlet Chemical 

Company, Norphlet, Union County, Arkansas. 27 January 2012. Pages: 86. 

16. WESTON. 2012. W etlands Evaluation. MacMillan Ring Free Oil Site. N orphlet, Union 

County, Arkansas. 16 August 2012. Pages: 13. 

17. EPA. 2009. Pollution Report. Norphlet Chemical Inc. Norphlet, Union County, Arkansas. 29 

September 2009. Pages: 2. 

18. National Drought Mitigation Center, United States Department of Agriculture (USDA) and the 

National Oceanic and Atmospheric Administration (NOAA). 2012. U.S. Drought Monitor. 

23 August 2012. Pages: 1.

19. Test America Laboratory, Inc. 2012. Test America Analytical Report. J ob ID 680-82124-1. 

For Weston Solutions, Inc. 10 September 2012. Pages: 15. 

20. ADPC&E. 1992. MacMillan Oil Refinery Final Pit Sludge Analysis. Letter to Charles Fisher, 

EPA, Region 6. 8 September 1992. Pages: 157. 

21. WESTON. 2013. P roject Note to File. Pond Area Measurements. MacMillan Ring Free Oil, 

Norphlet, Union County, Arkansas. 29 July 2013. Pages: 3. 

22. WESTON. 2012. Norphlet Chemical Site Reassessment Photo Summary. 1 4-16 August 

2012. Pages: 16. 

23. Felton Environmental Services, Inc. 2005. Preliminary Site Assessment. MacMillan Ring-Free 

Oil Company Site, Norphlet, Union County. Arkansas. 1 February 2005. Pages: 224. 

24. Federal Emergency Management Agency (FEMA). 2007. Flood Insurance Rate Map. Union 

County, Arkansas, and Incorporated Areas. Map Number 05139C0145C. 28 September 2007. 

Pages 3. 

25. WESTON. 2012. Q uality Assurance Sampling Plan for Site Reassessment. Norphlet 

Chemical, 600 MacMillan Road, Norphlet, Union County, Arkansas. August 2012. P ages: 

228. 

26. EPA Region 6 Laboratory. 201 3. Final Analytical Reports. Norphlet Chemical. Project 

12SF152. October - November 2012, February 2013. Pages: 696. 

27. MacMillan Petroleum. 1984. Revised Closure Plan. MacMillan Petroleum, Norphlet, 

Arkansas. June 1984. Pages: 101. 

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ARD008049207
28. ADPC&E. 1995. Memorandum. Closeout of Outstanding Issues. MacMillan Ring Free Oil. 

Norphlet, Arkansas. 30 January 1995. Pages: 2. 

29. EPA. F act Sheet. U sing Qualified Data to Document an Observed Release and Observed 

Contamination. EPA 540-F-94-028. November 1996. Pages: 18. 

30. WESTON. Field Logbooks. WO# 20406.012.019.0718.01. Field Logbook Notes for Norphlet 

Chemical. 06 June 2012 to 08 August 2012. Pages: 27. 

31. EPA. 1988. B est Demonstrated Available Technology (BDAT) Background Document for 

K048, K050, K051, K052 (excerpts). EPA/530-SW-88-031C. August 1988. Pages: 25. 

32. Toxics Release Inventory Program. www.epa.gov/TRI/. TRI Explorer search conducted for 

area code 71759. 2011 Data Update as of March 2013. Pages: 2. 

33. EPA. 2013. Enviromapper for Envirofacts database. 

http://www.epa.gov/emefdata/em4ef.html?ve=16,33.29722213745117,-

92.66215515136719&pText=71759,AR . Accessed 18 July 2013. Pages: 20. 

34. WESTON. 2013. Project Note to File. Level II Wetland Perimeter Measurement. MacMillan

Ring Free Oil, Norphlet, Union County, Arkansas. 17 April 2013. Pages: 2. 

35. Ecosystem Management and Restoration Research Program (EMRRP). 2001. Riparian Habitat 

Management for Reptiles and Amphibians on Corps of Engineers Projects. ERDC TNEMRRP-SI-22. August 2001. Pages 13. 

36. WESTON. 2013. Phone Conversation Record with Arkansas Game and Fish Commission 

South Central Regional Office. Fisheries in Hayes Creek, Flat Creek, Haynes Creek, 

Smackover Creek and the Ouachita River. 18 Jul 2013. Pages: 1.

37. USGS. 2013. Surface-Water Annual Statistics for the Nation. USGS 07362100 Smackover 

Creek near Smackover, Arkansas. 

http://waterdata.usgs.gov/nwis/annual?referred_module=sw&search_site_no=07362100&f. 

Accessed 22 April 2013. Pages: 1. 

38. USGS. 2013. Surface-Water Annual Statistics for the Nation. USGS 07362000 Ouachita River 

at Camden, Arkansas. 

http://waterdata.usgs.gov/nwis/annual?referred_module=sw&search_site_no=07362000&f. 

Accessed 22 April 2013. Pages: 1. 

39. WESTON. 2013. Project Note to File. Calculating Overland Flow Distances. MacMillan Ring 

Free Oil, Norphlet, Union County, Arkansas. 9 May 2013. Pages: 3. 

40. WESTON. 2013. Project Note to File. Slope Calculation. MacMillan Ring Free Oil, Norphlet, 

Union County, Arkansas. 24 April 2013. Pages: 1. 

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41. WESTON. 2013. P roject Note to File. In-Water Target Distance Limit Measurements. 

MacMillan Ring Free Oil, Norphlet, Union County, Arkansas. 28 May 2013. Pages: 2. 

42. WESTON. 2013. P hone Conversation Record with ADEQ. Hayes Creek drainage ditches, 

Norphlet, Union County, Arkansas. 10 May 2013. Pages: 1. 

43. EPA. 1992. M emorandum. R equest for a Removal Action at MacMillan Ring Free Oil 

Company Site, Norphlet, Union County, Arkansas. 9 November 1992. Pages: 14. 

44. EPA. 1997. R emoval Phase III Action Polreps. M acMillan Ring Free Oil Company Site, 

Norphlet, Union County, Arkansas. 17 March 1994 - 1 July 1997. Pages: 46. 

45. Ecology and Environment, Inc. (E&E). 1998. CERCLA Biodegradation Project Removal 

Report for Macmillan Ring-Free Oil Company, Norphlet, Union County, Arkansas. 13 M ay 

1998. Pages: 512. 

46. PDP Analytical Services. 1992. U.S. EPA CLP Form I Analyses Data Sheets. SDG P701. 23 

June 1992. Pages: 65. 

47. EPA. 1992. P olRep No. 4, M acMillan Oil Refinery, Norphlet, Union County, Arkansas. 22 

June 1992. Pages: 3. 

48. WESTON. 2013. Project Note to File. Sample Quantitation Limit (SQL) Calculation. 

MacMillan Ring Free Oil, Norphlet, Union County, Arkansas. 29 July 2013. Pages: 2. 

49. WESTON. 2013. Project Note to File. Location of Site within Sub-Watershed Map. 

MacMillan Ring Free Oil, Norphlet, Union County, Arkansas. 3 September 2013. Pages: 3. 

50. WESTON. 2013. Project Note to File. J Bias on Samples Analyzed Out of Hold Time. 

MacMillan Ring Free Oil, Norphlet, Union County, Arkansas. 5 September 2013. Pages: 1. 

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SITE SUMMARY

MacMillan Ring Free Oil (MacMillan) has also been referred to as Norphlet Chemical in several of the 

historical documents referenced. These two separate facilities have been located on the same property, 

at different times, and operated by different owners, but the focus of this HRS Documentation Record 

is historical operations that occurred during ownership by MacMillan. Norphlet Chemical did not use 

the sources identified in this HRS Documentation Record. 

The former MacMillan Ring Free Oil site is located on MacMillan Road off Arkansas Highway 335, 

Norphlet, Union County, Arkansas (Ref. 3, p. 1; Ref. 5, p. 2). The facility boundary is approximately 

100 acres as depicted on Attachment A, Figure A-2. The facility is bordered by a r esidential 

subdivision and the Norphlet Public Schools complex (which includes kindergarten through 12th 

grade) on the west, a city park and baseball fields to the northwest and Hayes Creek to the north and 

east. In addition, railroad tracks run east of the facility with railroad spurs on the eastern portion of the 

property. To the south are undeveloped woods, the City of Norphlet Wastewater Treatments Ponds, 

and Massey Creek (Attachment A, Figure A-1; Ref. 5, p. 2; Ref. 6, p. 10).

During MacMillan’s operation there were numerous tanks located throughout the property as seen in a 

plant layout map included in the MacMillan Closure Report (Ref. 27, p . 11). D uring a 1980 E PA 

Preliminary Assessment of the facility, 167 tanks with a total capacity of 510,000 barrels of refined 

products were identified (Ref. 20, pg. 21). In addition, a 50,000-barrel bulk crude AST was still onfacility in January 2012, but had been removed when a site visit from EPA contractors occurred in 

August 2012 (Ref. 6, p,. 21; Ref. 15, p. 72; Ref. 30, p. 3). To the north of the facility was a group of 

ASTs that were used for asphalt storage. In January 2012, t hese tanks were in various stages of 

disrepair, and several tanks had been removed (Ref. 15, pp. 80 -86). During a June 2012 site visit by 

EPA contractors, these tanks were observed to have been removed (Ref. 30, p. 3). 

The former Boiler House, located west of Source 4, i s still located on the property, with the boiler 

equipment still in place. The building is currently locked with asbestos hazard warning signs (Ref. 6, 

p. 21). The former canning building and drum storage building are still currently located on-property, 

with chemicals observed throughout both areas (Ref. 6, p. 23). Several 55-gallon metal and plastic 

drums were observed throughout the western and northern portions of the canning building. Some 

drums were physically damaged, dented, and or leaking. Additionally several bags of chemicals were 

located within the buildings, with physical conditions of the storage bags ranging from well wrapped 

with plastic to ripped and torn. The southwestern portion of the canning building contained numerous 

5-gallon buckets and 1-liter containers of named and un-named chemicals. At least three unlabeled 

1,000 gallon plastic storage tanks enclosed by metal frames were observed and contained a brown 

liquid. Concrete flooring throughout the building had observable staining (Ref. 6, pp. 24, 146-162). 

The area west of the canning and drum storage building is gravel covered with a number of metal pipe 

racks with process piping still in place. West of the piping racks is the area used by Norphlet Chemical

for their manufacturing operation. All of the storage tanks, tower, and process vessels and piping are 

still in place from the Norphlet Chemical operation. Storm water from this area of the facility drains 

westward to a n ew small wastewater treatment system which is located on the eastern edge of the 

former wastewater treatment plant. A water leak was discovered from a system of sumps from the 
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Norphlet Chemical process area. The runoff from the leak was flowing towards the Fire Water Pond 

located to the south (Ref. 6, p. 24). 

The MacMillan facility is currently partially fenced along the west side of the property, but there is no 

fence along the railroad tracks to the east. Debris piles consisting of piping, empty drums, and used 

equipment and parts are located throughout the property. T hese piles are not located on plastic or 

covered (Ref. 6, pp. 11, 133, 137) . E leven large surface impoundments (referred to in historical 

documents as ponds) were previously located on the south side of the facility and the east side of the 

railroad tracks (Ref. 20, pp. 22-32; Ref. 23, pp. 38, 40). These ponds have been backfilled, and are 

marked by open areas covered by sparse vegetation; these open areas are also visible in Attachment A, 

Figure A-2. 

For HRS scoring purposes, the site consists of two sources which consist of buried/backfilled surface 

impoundments, along with a release of hazardous substances to nearby surface water bodies. 

The facility has a long history of industrial operations that are summarized as follows: 

• As early as 1929, t he facility and surrounding property operated as a crude oil refinery and 

manufacturer of lubrication oil and asphalt products. During this time, the facility was called 

MacMillan Ring Free Oil Company, Inc. (Ref. 6, p. 34; Ref. 12, pp. 2, 4). In 1987, operations 

ceased due to an involuntary bankruptcy (Ref. 7, p. 5). 

• In 1987, Nor-Ark Industrial Corporation obtained a permit to discharge wastewater to nearby 

receiving waters at the property (Ref. 13, p.1) and eventually purchased the property in 1989 

(Ref. 10, p. 10; Ref. 14, p. 1). Nor-Ark Industrial provided storage tank leasing for asphalt 

products until filing for bankruptcy in 1991 (Ref. 6, p. 10; Ref. 10, p. 10). 

• In 1999, Norphlet Chemical Storage Inc. purchased the property at an auction. The property 

included approximately 106 acres that was part of the former MacMillan Ring Free Oil 

Refinery. The 106 acres that comprised MacMillan Refinery included a 94.8-acre tract of land 

west of the railroad and the 10.7-acre tract of land east of the railroad (Ref. 6, p.34). 

• In 2004, N orphlet Chemical Storage, Inc. sold the 94.8-tract of land to Norphlet Chemical 

Properties, Inc. or Norphlet Chemicals, Inc. (NCI) (Ref. 6, p.34) . N CI planned to produce 

1,1,2,2-tetrafluoroethane (Freon 134A) refrigerant from anhydrous hydrofluoric acid and 

trichloroethylene. The plant never operated as intended and filed for bankruptcy in 2008 (Ref.

12, p. 1). 

Regulatory Enforcement History

Multiple phases of investigation have occurred at the property since 1980. These investigations and 

the regulatory history of the facility were obtained from the Arkansas Department of Environmental 

Quality (ADEQ) and are summarized in the following text.

During ownership of the facility, MacMillan encountered both state and federal enforcement actions 

for multiple violations, including release of oilfield waste to Arkansas state waters, improper storage of 

hazardous waste, failure to perform required ground water monitoring and failure to implement

approved closure plans for on-property impoundments (Ref. 9, pp. 1, 7, 10, 19).
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In 1980, MacMillan Refinery filed a Notification of Hazardous Waste Activity Part A application with 

the United States Environmental Protection Agency (EPA). D uring its operations, MacMillan used 

dissolved air flotation (DAF) systems as a part of their wastewater treatment process from 1975 until 

1987. The DAF sludge located in three surface impoundments on the property (Ponds, 705, 706, and 

707) contained petroleum waste products classified as hazardous waste (K048) under 40 C ode of 

Federal Regulations (CFR) §261.32 (Ref. 27, p.2). S ince the DAF impoundments contained a 

hazardous waste, a ground water monitoring system was required. For years, MacMillan

communicated with EPA that they did not agree that the DAF should be regulated as hazardous waste

and continued utilizing the impoundments without a ground water monitoring system (Ref. 9, pp.2-3; 

Ref. 7, pp. 2 -4; Ref. 27, p.2). D uring that time, several overflows to Hayes Creek from the DAF 

impoundments and other impoundments occurred (Ref. 8, pp. 5-6, 9; Ref. 9, p.1). 

On 21 September 1984, the EPA issued a Compliance Order and Notice of Opportunity for Hearing 

against MacMillan Refinery charging the company with failure to install a ground water monitoring 

system (Ref. 8, pp. 1 -2). In August 1985, Arkansas Department of Pollution Control and Ecology 

(ADPC&E) ordered MacMillan to either install the necessary controls for the impoundments

containing hazardous waste to comply with its RCRA Part B Permit, or submit a closure plan (Ref. 7, 

p. 1). The MacMillan facility did not comply with either order and, in 1986, ADPC&E terminated 

MacMillan’s status as a Treatment, Storage, Disposal (TSD) facility, and directed them to implement a 

closure plan for the on-property surface impoundments (ponds) (Ref. 10, p. 11). A closure plan was 

prepared by MacMillan and modified by ADEQ in May 1986, but the facility filed for bankruptcy 

before the plan was implemented (Ref. 7, p. 5). 

Nor-Ark purchased the property in 1989, assuming liability for all chemicals and contaminated media 

on the property, but did not implement any ground water monitoring or the impoundment closure plan 

mandated by ADEQ (Ref. 7, pp. 1, 3). Nor-Ark also incurred several environmental violations during 

its ownership of the property. T hese violations ranged from failure to close the hazardous waste 

impoundments and monitor ground water (Ref. 7, p. 1; Ref. 9, p. 6; Ref. 11, pp. 2, 5, 8), failure to 

maintain 12-inch freeboard on t he impoundments (Ref. 9, p. 7), unpermitted discharges, improper 

storage of hazardous wastes, and failure to meet administrative and reporting requirements (Ref. 9, pp. 

7-21; Ref. 10, pp. 2-3, 21-22), to violations of asbestos regulations (Ref. 8, pp. 8, 10-12). By 1990, 

Nor-Ark had dismantled most of the facility and sold the majority of the equipment and fixtures (Ref. 

14, p. 2). In March 1991, Nor-Ark filed for bankruptcy (Ref. 6, p. 10). 

During its ownership under Nor-Ark, and after the Nor-Ark bankruptcy, a number of facility visits by 

EPA, EPA contractors, and ADPC&E documented evidence of overflow from the ponds and oily 

material released to the environment (Ref. 9, pp . 7-21, 23-25, 27-28). A series of EPA Superfund 

removal actions were conducted from 1992 through 1997 to address the immediate issue of release to 

the environment (Ref. 9, pp. 28-30). These removal actions included the following: 

• In 1992, a pproximately 31,500 g allons of free-floating oil materials were recovered from 

impoundments, and oil and oil-contaminated vegetation along Hayes Creek and Massey Creek 

were removed (Ref. 8, p. 11). 

• In 1993, a pproximately 9,600 g allons of composite waste/flammable corrosive liquids and 

50,080 gallons of waste oil were removed and transported off-property. Asbestos on the 

facility (found in buildings and piping) was also abated and transported off-property for 
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disposal. Removal activities of Comprehensive Environmental Response, Compensation, and 

Liability Act (CERCLA)- regulated wastes had ceased, and the remaining waste at the facility

was slated for removal under the Oil Pollution Act (OPA) (Ref. 8, pp. 13, 22-23). 

• From 1994 through 1997, removal actions continued with pumping, treating, and discharging

of OPA and CERCLA-regulated wastes from the impoundments into the surrounding creeks 

and conducting on-site bioremediation of approximately 43,000 cubic yards of contaminated 

soil (Ref. 8, pp. 26-27; Ref. 9, pp. 40 -41). The on-site biodegradation of impoundment 

sediments were treated on-site within land treatment units (LTUs). OPA and CERCLA wastes 

were treated at the same time within 13 separate batches, and bioremediated soils from all 

impoundments (OPA and CERCLA) were used to backfill the impoundments (Ref. 8, pp. 26-

27; Ref. 45, pp. 5, 6). 

EPA’s removal actions were conducted to mitigate the imminent threat to the public health and 

environment; however, these removal actions did not address environmental concerns of total 

petroleum hydrocarbon (TPH)-contaminated soil and contaminated surface water runoff that existed at 

the facility (Ref. 6, p. 37; Ref. 9, pp. 41-43).

The facility historically has had a mix of OPA and CERCLA wastes. It was discovered near the end of 

the OPA response, from state records and conversations with a former employee, that the 

impoundments (ponds) had been contaminated with the following listed Resource Conservation and 

Recovery Act (RCRA) hazardous wastes generated by petroleum refining operations: K048- DAF, 

K049 – slop oil emulsion solids, K050 – heat exchanger bundle cleaning sludge, K051- American 

Petroleum Institute (API) separator sludge, and K052 – tank bottoms. These RCRA hazardous wastes 

also constitute hazardous substances pursuant to Section 101(14) of the CERCLA. These RCRA 

hazardous wastes have commingled with the contents of impoundments that had been considered OPA 

regulated (Ref. 43, p. 3). 

In April 2009, an ADEQ inspection prompted the State to request an emergency removal action by 

EPA. ADEQ had reported corrosion on tank relief valves associated with tanks containing anhydrous 

hydrofluoric acid (AHF) and AHF mixtures. The tanks (associated with Norphlet Chemical operations 

and not MacMillan) were located approximately 500 feet from the Norphlet Public School complex. 

Initial emergency actions conducted by EPA included removal of the AHF and AHF mixtures, 

construction of a scrubber to neutralize residual AHF remaining in tanks and flow lines, and 

decontamination of the associated tanks and piping (Ref. 17, pp. 1, 2).

Although EPA Emergency Response and Removal Actions took place on the property from 1992-1997, 

and in 2009, t he activities performed to date were conducted to stabilize the Site, and all source 

materials cited in this report currently remain on-site (Ref. 6, pp. 1-27; Ref. 28, pp. 1-2). 

In April 2010, the facility was placed on the State Priority List under the Arkansas Pollution Control 

and Ecology Commission’s Regulation No. 30. The facility was listed due to the potential for soil, 

surface water, and/or ground water contamination on- and off-site and the need to remediate the site to 

protective levels (Ref. 12, p. 2). 
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Site Assessment History

The facility has undergone multiple assessments from 1981-2011 analyzing ground water, surface 

water, surface soil, subsurface soil, and sediment. P ast investigations include a Site Assessment 

conducted by B&F for MacMillan Ring Free Oil in 1987; EPA-lead investigations in 1979, 1981, 

1985, 1993, and ongoing from 1994-1997 (Ref. 6, p. 78-81); and a Comprehensive Site Assessment 

(CSA) commissioned by ADEQ in 2011 (Ref. 6, pp. 1-584). 

The 2011 CSA performed by ADEQ contractors FTN Associates, Ltd. and Center for Toxicology and 

Environmental Health (CTEH) was conducted to determine the nature and extent of hazardous 

substances released into the environment, the potential for additional releases of hazardous substances, 

and the current and possible future risks to human health and the environment from the site. Results 

indicated contamination of the surface and subsurface soil, ground water, and surface water/sediment 

(Ref. 6, pp.12 -13, 77-105). C ontaminants of concern included polycyclic aromatic hydrocarbons 

(PAHs), TPH, and metals (Ref. 6, pp. 55, 91). 

Many of the ground water samples collected during the CSA had hydrocarbon odors; some samples 

effervesced which indicated the presence of methane gas; and others were characterized by oil sheens 

or contained wastes (Ref. 6, p. 12) . T he plume of ground water contamination exists beneath the 

property, and given the potentiometric surface, off-property migration west of the site is not expected, 

and the southeast extent of the plume has not been defined (Ref. 6, p. 85). 

The CSA noted extensive black hydrocarbon surface soil staining in the area of the former tank farms 

and drainage ditches at the facility, oil sheens on the surface of former impoundments (ponds) after 

rainfall events, and yellow and green stains on surface soil in the area of the former NCI plant (Ref. 6, 

pp. 12, 87). Surface soil sampling conducted during the CSA also identified TPH-contamination in the 

area of the former tank farm and the backfilled former impoundments on the east and west sides of the 

railroad tracks (Ref. 6, pp. 12, 87, 99) , as well as one “hot spot” of PAH-contaminated surface soil 

located within the surface water drainage pathway directly downgradient from Tank 514 (Ref. 6, pp. 

12, 99, 122). TPH was also detected in surface water samples taken from Hayes Creek, Massey Creek, 

the on-property firewater pond, and a drainage pathway on the east side of the facility that flows into 

Hayes Creek (Ref. 6, pp. 13, 91, 92, 99). Sediment samples collected from Hayes Creek indicated the 

presence of TPH, chromium, and lead (Ref. 6, pp. 13, 92) . D uring the sampling event, samplers 

observed a sheen along portions of Hayes Creek and in the drainage ditch on t he west side of the 

railroad tracks (Ref. 6, pp. 91, 99). 

In August 2012, the EPA Region 6 Prevention and Response Branch (EPA-PRB or EPA) performed 

supplemental sampling for Site Reassessment (SR) at MacMillan to determine whether the site 

presents a threat to public health or welfare of the United States or the environment in accordance with 

40 CFR 300.415. EPA collected surface water and sediment samples from locations within Hayes 

Creek; sediment, surface water, and soil samples from overland flow pathways; soil waste samples 

from on-site sources; passive soil gas samples between the historical ground water plume boundary 

and the Norphlet School System complex west of the facility; and ground water samples from a 

background location and from monitoring wells at existing locations on the facility (Ref. 5, pp. 4, 5; 

Ref. 25, pp. 5-6). 
HRS Documentation Record 12 MacMillan Ring Free Oil

ARD008049207

The EPA Team also conducted a wetland survey on 16 A ugust 2012 that identified that one of the

former impoundments (Pond 713) east of the rail line on the property currently serves as a wetland 

habitat. Although the wetland evaluation was conducted under drought conditions, historically, this 

area has been inundated with water as observed during previous site visits and by historical aerials, and 

indicators of wetland hydrology were noted in the evaluation. The wetland habitat is approximately 50 

feet south of former Ponds 710 through 712 on the east side of the facility and abutting a loop of Hayes 

Creek. (Ref. 15, pp. 38, 41; Ref. 16, pp. 1-13; Ref. 18, pp. 1; Ref. 24, pp. 1-2; Ref. 30, pp. 1-2; Ref. 

42). The wetland survey also identified that Hayes Creek is a sensitive riparian habitat (Ref. 16, pp.1, 

3, 4). 

Results from the EPA SR sampling event indicated an observed release to the surface water pathway

from the site, with some samples containing Level II concentrations. Chemicals of concern released to 

the pathway include metals, and semivolatile organic compounds (SVOCs). The investigation 

identified two sources and six probable points of entry where hazardous substances from the sources

were entering the surface water pathway. The two sources identified are the three separate backfilled 

former surface impoundments (ponds) on the east side of the railroad tracks (Pond 710, Pond 711, and 

Pond 712), and the area of the backfilled former impoundments west of the firewater pond (Ponds 704-

707) (Ref. 5, p. 13 ; Ref. 5, pp. 14-18). Analytical results for samples collected at probable points of 

entry to Hayes Creek, and from within Hayes Creek itself, indicated the presence of metals, and 

SVOCs. A nalytical results for samples collected at the probable point of entry to the wetland

contiguous to Hayes Creek (PPE-03) and the wetland itself also indicated the presence of metals and 

SVOCs (Ref. 5, pp. 6, 13; Ref. 5, pp. 26-31, 20; Ref. 19, pp. 6-12). 
HRS Documentation Record 13 MacMillan Ring Free Oil

ARD008049207

WORKSHEET FOR COMPUTING HRS SITE SCORE

 S S2

1. Ground Water Migration Pathway Score (Sgw) NS NS

(from Table 3-1, line 13) 

2a. Surface Water Overland/Flood Migration Component 100 10,000 

(from Table 4-1, line 30) 

2b. Ground Water to Surface Water Migration Component NS NS

(from Table 4-25, line 28) 

2c. Surface Water Migration Pathway Score (Ssw) NS NS

(Enter the larger of lines 2a and 2b as the pathway score)

3. Soil Exposure Pathway Score (Ss) NS NS

(from Table 5-1, line 22) 

4. Air Migration Pathway Score (Sa) NS NS

(from Table 6-1, line 12) 

5. Total of Sgw

2 + Ssw2 + Ss2 + Sa2

 ---- 10,000 

6. HRS Site Score: Divide the value on line 5 by 4 and take 50.00 

the square root. 

Notes: 

S Score

S2 Score squared

NS Not scored

Tables 3-1, 4-1, 4-25, 5-1, and 6-1 refer to score sheets presented in the HRS (Ref. 1). Table 4-1 is reproduced in the 

following pages of this HRS Documentation Record for the convenience of the reader.
HRS Documentation Record 14 MacMillan Ring Free Oil

ARD008049207

DRINKING WATER THREAT - Not Scored (NS)

Factor Categories and Factors Maximum Value Value Assigned

 

Likelihood of Release

1. Observed Release 550 550 

2. Potential to Release by Overland Flow:

2a. Containment 10 NS 

2b. Runoff 25 NS 

2c. Distance to Surface Water 25 NS 

2d. Potential to Release by Overland Flow

 (lines 2a[2b + 2c]) 500 NS 

3. Potential to Release by Flood:

3a. Containment (Flood) 10 NS 

3b. Flood Frequency 50 NS 

3c. Potential to Release Flood

 (lines 3a x 3b) 500 NS 

4. Potential to Release

(lines 2d + 3c, subject to a maximum of 500) 500 NS 

5. Likelihood of Release (higher of lines 1 and 4) 550 550 

Waste Characteristics

6. Toxicity/Persistence a NS 

7. Hazardous Waste Quantity a NS 

8. Waste Characteristics

(Toxicity/Persistence x Hazardous Waste 

 Quantity, then assign a

value from Table 2-7) 100 NS 

Targets

9. Nearest Intake 50 NS 

10. Population

10a. Level I Concentrations b NS 

10b. Level II Concentrations b NS 

10c. Potential Contamination b NS 

10d. Population

(lines 10a + 10b + 10c) b NS 

11. Resources 5 NS 

12. Targets (lines 9 + 10d +11) b NS 

Drinking Water Threat Score

13. Drinking Water Threat Score

[(lines 5 x 8 x 12)/82,500

subject to a maximum of 100] 100 NS 
HRS Documentation Record 15 MacMillan Ring Free Oil

ARD008049207

HUMAN FOOD CHAIN THREAT 

Factor Categories and Factors Maximum Value Value Assigned

Likelihood of Release

14. Likelihood of Release

(Same value of line 5) 550 ___550 

Waste Characteristics

15. Toxicity/Persistence/ Bioaccumulation a 5 x 108

16. Hazardous Waste Quantity a 10,000 

17. Waste Characteristics

(Toxicity/Persistence/Bioaccumulation x Hazardous Waste 

 Quantity, then assign a

value from Table 2-7) 1,000 1,000 

Targets

18. Food Chain Individual 50 20 

19. Population

19a. Level I Concentrations b 0 

19b. Level II Concentrations b 0 

19c. Potential Human Food Chain Contamination b 0.0000006 

19d. Population 

 (lines 19a + 19b + 19c) b 0.0000006 

20. Targets (lines 18 + 19d) b 20.0000006 

 

Human Food Chain Threat Score

21. Human Food Chain Threat Score

[(lines 14 x 17 x 20)/82,500

subject to a maximum of 100] 100 100.00

 

 
HRS Documentation Record 16 MacMillan Ring Free Oil

ARD008049207

ENVIRONMENTAL THREAT

Factor Categories and Factors Maximum Value Value Assigned

Likelihood of Release

22. Likelihood of Release

(Same value of line 5) 550 550 

Waste Characteristics

23. Ecosystem Toxicity/Persistence Bioaccumulation a 5x108 

24. Hazardous Waste Quantity a 10,000 

25. Waste Characteristics

(Ecosystem Tox./Persistence x Bioaccumulation x

 Hazardous Waste Quantity, then assign a

value from Table 2-7) 1,000 1,000 

 

Targets

26. Sensitive Environments

26a. Level I Concentrations b 0 

26b. Level II Concentrations b 25 

26c. Potential Contamination

26c. Potential Contamination b 0 

26d. Sensitive Environments

 (lines 26a + 26b + 26c) b 25 

27. Targets (value from line 26d) b 25 

 

Environmental Threat Score

28. Environmental Threat Score

[(lines 22 x 25 x 27)/82,500

subject to a maximum of 60] 60 ___100 .00 

SURFACE WATER OVERLAND/FLOOD MIGRATION COMPONENT SCORE FOR A WATERSHED

29. Watershed Score 

[(Lines 13 + 21+ 28), 

subject to a maximum of 100] 100 100.00

SURFACE WATER OVERLAND/FLOOD MIGRATION COMPONENT SCORE

30. Component Score 

(Highest score from Line 29

for all watersheds evaluated, 

subject to a maximum of 100) 100 100.00

 
Source Characterization – Source 1

HRS Documentation Record 17 MacMillan Ring Free Oil

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SOURCE DESCRIPTION

2.2 Source Characterization

Source Description: Source 1 – Buried/Backfilled Surface Impoundments (Ponds 710, 711, and 

712) 

Source Type

The area to the east of the former MacMillan Refinery and the railroad tracks contained three surface 

impoundments (ponds) (Source 1) which had been historically used by MacMillan operations for 

storing crude oil. O ne of these ponds, historically referred to as Pond 712 as well as Pond 4 is 

approximately 61,000 s quare feet (ft2

) in area (Ref. 20, pp. 11, 20; Ref. 21). In 1980, du ring a 

Preliminary Assessment (PA) conducted by EPA contractors, Pond 712/4 was found to contain a total 

volume of 450,000 gallons (Ref. 20, p. 25). The pond historically referred to as Pond 711 as well as 

Pond 6 is approximately 12,600 ft2 in area (Ref. 20, pp. 11, 20; Ref. 21, pp. 1-3). In 1980, during a PA

conducted by EPA contractors, Pond 711/6 was found to contain a total volume of 225,000 gallons 

(Ref. 20, p. 27). The pond historically referred to as Pond 710 as well as Pond 7 is approximately 

10,800 ft2 in area (Ref. 20, pp. 11, 20; Ref. 21). In 1980, during a PA conducted by EPA contractors, 

Pond 710/7 was found to contain a total volume of 240,000 gallons (Ref. 20, p. 28). 

Although historically, these ponds contained segregated wastes, during remediation activities 

conducted in 1995, OPA and CERCLA wastes were treated at the same time within 13 separate 

batches, and bioremediated soils from all impoundments (OPA and CERCLA) were used to backfill 

the impoundments (Ref. 8, pp. 26 -27; Ref. 45, pp. 5, 6) . In November 1995, treated soil from the 

CERCLA regulated waste was placed back into Source 1 (Ref. 44, p. 22 ). According to ADPC&E, 

although Source 1 was backfilled with soil that was bioremediated, it is likely that there are affected 

soils left in place, as reportedly the financial resources were not available at the time to meet proposed 

cleanup criteria (Ref. 6, p. 81; Ref. 28, pp. 1-2). Sidewall contamination remained in place, as it was 

outside the scope of EPA Emergency Response Branch actions (Ref. 9, p. 42). The location of the 

backfilled Source 1 is still apparent due to lack of vegetation present (Ref. 6, p. 22; Ref. 22, pp. 10-12). 

Ponds 710, 711, and 712 (Source 1) operated in the past without any freeboard, or liner and discharges 

to Hayes Creek were observed (Ref. 20, pp. 11, 25, 35; Ref. 23, p. 27 ). In 1994, Source 1 remained 

open and visual staining was observed on the earthen berms of the ponds (Ref. 23, p. 32) . Source 1

has a history of discharging to the adjacent Hayes Creek (Ref. 20, p. 11; Ref. 23, pp. 40, 43). 

Historically, Source 1 overflowed during floods that were documented in December 1982 and January 

1983. T he oily material release covered approximately 150 t o 200 a cres of Ouachita River bottom 

(Ref. 23, p. 157). 

Source 1 is classified as the HRS source type “Buried/Backfilled Surface Impoundment” (Ref. 1, Table 

2-5).
Source Characterization – Source 1

HRS Documentation Record 18 MacMillan Ring Free Oil

ARD008049207

Source Location

Source 1 is located approximately 150 feet east of the railroad tracks and is also located adjacent to, 

and abutting, the west side of Hayes Creek (Ref. 6, pp. 30, 31). The location of the backfilled Ponds 

712, 710, and 711, Source 1, is depicted on Attachment A, Figure A-2.

Source Containment

Release To Surface Water

During 2012 field activities, there was no evidence of a maintained engineered cover or any run-off 

management system, and Source 1 functioned without a liner (Ref. 20, p. 25; Ref. 22, pp. 10 -12). 

Although Source 1 ha s been backfilled, placement of an impermeable membrane was deemed too 

expensive during the closeout of the pond (Ref. 28, p. 2). 

Containment Value: 10 

2.4.1 Hazardous Substances

During a Sampling Inspection conducted in 1985 by EPA contractors, a sample was taken from Source 

1. Mainly unknown organics were detected in the sample (Ref. 20, p. 1 1). Sampling conducted in 

1992 on the sludge from Ponds 711 and 712 of Source 1, before removal activities were conducted, 

had the following chromium levels detected. Concentrations of chromium were at 24.9 mg/kg and 

16.9 mg/kg respectively (Ref. 46, pp. 49, 50) . Chromium is not a hazardous constituent associated 

with OPA wastes, but is associated with DAF and has been an issue at the site for a long time (Ref. 20, 

p. 4; Ref. 27, p. 3). 

As part of SR sampling of the MacMillan facility from 13 through 17 August 2012, EPA contractors 

collected three solid waste samples from Source 1 (Ref. 5, pp. 5; Ref. 22, pp. 10-12; Ref. 25, p. 21). 

The samples were analyzed for target compound list (TCL) volatile organic compounds (VOCs), TCL 

SVOCs, pesticides, and polychlorinated biphenyls (PCBs) by the Contract Laboratory Program (CLP) 

Statement of Work (SOW) for Multi-Media, Multi-Concentration Organic Analysis, OLM04.2, and 

TAL metals with mercury by CLP SOW Multi-Media, Multi-Concentration Inorganics Analysis, 

ILM05.3 (Ref. 25, p. 23) . TCL SVOCs were also analyzed by EPA SW 846 Method 8270 for lowlevel PAHs (Ref. 26, pp.431-432). The samples were submitted to the EPA Region 6 Environmental 

Services Branch Laboratory, located in Houston, Texas (Ref. 5, p. 5; Ref. 26, pp. 1, 309, 431). 

Analytical evidence of the contamination in the waste source samples associated with the backfilled 

Ponds 710-712 (Source 1) located on the MacMillan site is summarized below. 

Hazardous

Substance

Evidence

References Sample ID Concentration

(mg/kg)

Reporting Limit1

(mg/kg)

EPA SR Sampling Activities – August 2012 

Anthracene PS-01-03-51 0.0183 J 0.0056 Ref. 26, pp. 431-433, 546; Ref. 30, p. 9
Source Characterization – Source 1

HRS Documentation Record 19 MacMillan Ring Free Oil

ARD008049207

Hazardous

Substance

Evidence

References Sample ID Concentration

(mg/kg)

Reporting Limit1

(mg/kg)

Benzo(a)anthracene PS-01-03-51 0.0872 J 0.0056 Ref. 26, pp. 431-433, 546; Ref. 30, p. 9

Benzo(a)pyrene PS-01-03-51 0.0617 J 0.0056 Ref. 26, pp. 431-433, 546; Ref. 30, p. 9

Benzo(k)fluoranthene PS-01-03-51 0.163 J 0.0056 Ref. 26, pp. 431-433, 546; Ref. 30, p. 9

Benzo(g,h,i)perylene PS-01-03-51 0.040 J 0.0056 Ref. 26, pp. 431-433, 546; Ref. 30, p. 9

Chrysene PS-01-03-51 0.285 J 0.0224 Ref. 26, pp. 431-433, 546; Ref. 30, p. 9

Dibenz(a,h)anthracene PS-01-03-51 0.011 J 0.0056 Ref. 26, pp. 431-433, 546; Ref. 30, p. 9

Fluoranthene PS-01-03-51 0.0832 J 0.0056 Ref. 26, pp. 431-433, 546; Ref. 30, p. 9

Indeno(1,2,3-cd)pyrene PS-01-03-51 0.0224 J 0.0056 Ref. 26, pp. 431-433, 546; Ref. 30, p. 9

Naphthalene PS-01-03-51 0.0927 J 0.0056 Ref. 26, pp. 431-433, 546; Ref. 30, p. 9

2-Methylnaphthalene PS-01-03-51 0.159 J 0.0056 Ref. 26, pp. 431-433, 546; Ref. 30, p. 9

Phenanthrene PS-01-03-51 0.148 J 0.0056 Ref. 26, pp. 431-433, 546; Ref. 30, p. 9

Pyrene PS-01-03-51 0.149 J 0.0056 Ref. 26, pp. 431-433, 546; Ref. 30, p. 9

Arsenic PS-01-03-51 1.8 0.5 Ref. 26, pp. 1-3, 125; Ref. 30, p. 9

Chromium PS-01-03-51 1,120 1.1 Ref. 26, pp. 1-3, 125; Ref. 30, p. 9

Lead PS-01-03-51 26.0 0.5 Ref. 26, pp. 1-3, 125; Ref. 30, p. 9

Manganese PS-01-03-51 113 0.5 Ref. 26, pp. 1-3, 125; Ref. 30, p. 9

Mercury PS-01-03-51 0.223 0.074 Ref. 26, pp. 1-3, 125; Ref. 30, p. 9

Vanadium PS-01-03-51 11.9 2.2 Ref. 26, pp. 1-3, 125; Ref. 30, p. 9

Zinc PS-01-03-51 49.1 2.2 Ref. 26, pp. 1-3, 125; Ref. 30, p. 9 

Acenaphthylene PS-02-03-51 0.0107 J 0.0044 Ref. 26, pp. 431-433, 550;Ref. 30, pp. 9-

10

Anthracene PS-02-03-51 0.0188 J 0.0044 Ref. 26, pp. 431-433, 550;Ref. 30, pp. 9-

10

Benzo(a)anthracene PS-02-03-51 0.0372 J 0.0044 Ref. 26, pp. 431-433, 550;Ref. 30, pp. 9-

10

Benzo(a)pyrene PS-02-03-51 0.0328 J 0.0044 Ref. 26, pp. 431-433, 550;Ref. 30, pp. 9-

10

Benzo(k)fluoranthene PS-02-03-51 0.0721 J 0.0044 Ref. 26, pp. 431-433, 550;Ref. 30, pp. 9-

10

Benzo(g,h,i)perylene PS-02-03-51 0.0373 J 0.0044 Ref. 26, pp. 431-433, 550;Ref. 30, pp. 9-

10

Chrysene PS-02-03-51 0.117 J 0.0044 Ref. 26, pp. 431-433, 550;Ref. 30, pp. 9-

10

Dibenz(a,h)anthracene PS-02-03-51 0.0067 J 0.0044 Ref. 26, pp. 431-433, 550;Ref. 30, pp. 9-

10

Fluoranthene PS-02-03-51 0.0378 J 0.0044 Ref. 26, pp. 431-433, 550;Ref. 30, pp. 9-

10

Fluorene PS-02-03-51 0.0378 J 0.0044 Ref. 26, pp. 431-433, 550;Ref. 30, pp. 9-

10

Indeno(1,2,3-cd)pyrene PS-02-03-51 0.0157 J 0.0044 Ref. 26, pp. 431-433, 550;Ref. 30, pp. 9-

10
Source Characterization – Source 1

HRS Documentation Record 20 MacMillan Ring Free Oil

ARD008049207

Hazardous

Substance

Evidence

References Sample ID Concentration

(mg/kg)

Reporting Limit1

(mg/kg)

2-Methylnaphthalene PS-02-03-51 0.122 J 0.0044 Ref. 26, pp. 431-433, 550;Ref. 30, pp. 9-

10

Naphthalene PS-02-03-51 0.0661 J 0.0044 Ref. 26, pp. 431-433, 550;Ref. 30, pp. 9-

10

Phenanthrene PS-02-03-51 0.116 J 0.0044 Ref. 26, pp. 431-433, 550;Ref. 30, pp. 9-

10

Pyrene PS-02-03-51 0.0817 J 0.0044 Ref. 26, pp. 431-433, 550;Ref. 30, pp. 9-

10

Arsenic PS-02-03-51 1.2 0.5 Ref. 26, pp. 1-3, 129; Ref. 30, pp. 9-10

Chromium PS-02-03-51 3.5 1.0 Ref. 26, pp. 1-3, 129; Ref. 30, pp. 9-10

Chromium(VI) PS-02-03-51 2.9 0.51 Ref. 19, p. 7

Lead PS-02-03-51 19.5 0.5 Ref. 26, pp. 1-3, 129; Ref. 30, pp. 9-10

Manganese PS-02-03-51 89.8 J* 0.5 Ref. 26, pp. 1-3, 129; Ref. 30, pp. 9-10

Mercury PS-02-03-51 0.114 0.067 Ref. 26, pp. 1-3, 130; Ref. 30, pp. 9-10

Vanadium PS-02-03-51 6.5 2.0 Ref. 26, pp. 1-3, 129; Ref. 30, pp. 9-10

Zinc PS-02-03-51 27.3 2.0 Ref. 26, pp. 1-3, 129; Ref. 30, pp. 9-10

Anthracene PS-03-03-51 0.0117 J 0.0044 Ref. 26, pp. 431-433, 554; Ref. 30, p. 10

Benzo(a)anthracene PS-03-03-51 0.0236 J 0.0044 Ref. 26, pp. 431-433, 554; Ref. 30, p. 10

Benzo(a)pyrene PS-03-03-51 0.0238 J 0.0044 Ref. 26, pp. 431-433, 554; Ref. 30, p. 10

Benzo(k)fluoranthene PS-03-03-51 0.0591 J 0.0044 Ref. 26, pp. 431-433, 554; Ref. 30, p. 10

Benzo(g,h,i)perylene PS-03-03-51 0.0249 J 0.0044 Ref. 26, pp. 431-433, 554; Ref. 30, p. 10

Chrysene PS-03-03-51 0.0927 J 0.0044 Ref. 26, pp. 431-433, 554; Ref. 30, p. 10

Dibenz(a,h)anthracene PS-03-03-51 0.0048 J 0.0044 Ref. 26, pp. 431-433, 554; Ref. 30, p. 10

Fluoranthene PS-03-03-51 0.0267 J 0.0044 Ref. 26, pp. 431-433, 554; Ref. 30, p. 10

Indeno(1,2,3-cd)pyrene PS-03-03-51 0.0105 J 0.0044 Ref. 26, pp. 431-433, 554; Ref. 30, p. 10

Naphthalene PS-03-03-51 0.0777 J 0.0044 Ref. 26, pp. 431-433, 554; Ref. 30, p. 10

Phenanthrene PS-03-03-51 0.0815 J 0.0044 Ref. 26, pp. 431-433, 554; Ref. 30, p. 10

Pyrene PS-03-03-51 0.0572 J 0.0044 Ref. 26, pp. 431-433, 554; Ref. 30, p. 10

Arsenic PS-03-03-51 13 0.5 Ref. 26, pp. 1-3, 133; Ref. 30, p. 10

Chromium PS-03-03-51 3.1 1.0 Ref. 26, pp. 1-3, 133; Ref. 30, p. 10

Lead PS-03-03-51 13.1 0.5 Ref. 26, pp. 1-3, 133; Ref. 30, p. 10

Manganese PS-03-03-51 86.4 0.5 Ref. 26, pp. 1-3, 133; Ref. 30, p. 10

Mercury PS-03-03-51 0.132 0.071 Ref. 26, pp. 1-3, 134; Ref. 30, p. 10

Vanadium PS-03-03-51 7.7 2.1 Ref. 26, pp. 1-3, 133; Ref. 30, p. 10

Zinc PS-03-03-51 30.4 2.1 Ref. 26, pp. 1-3, 133; Ref. 30, p. 10

Notes:

(mg/kg) milligrams per kilogram = 1,000 micrograms per kilogram (μg/kg) 

J Identification of analytes is acceptable; the reported value is an estimate because the samples were extracted past holding time. 

Concentrations should be considered minimum values (Ref. 26, p. 432). The estimated values are biased low (Ref. 26, p. 432; Ref. 

50, p. 1). 
Source Characterization – Source 1

HRS Documentation Record 21 MacMillan Ring Free Oil

ARD008049207

J* Identification of analyte is acceptable; the reported value is an estimate due to outlying quality control parameters (Ref. 26, pp. 3, 

695). These estimated values are biased low as the samples were extracted out of the hold time (Ref. 26, p. 432; Ref. 50, p. 1). 1 The Reporting Limit (RL) terminology used by the EPA Region 6 Laboratory is adjusted for sample aliquot, sample volume, and 

dilutions for the analysis and meets the definition of Sample Quantitation Limit (SQL) as defined by the HRS (Ref. 1, Section 1.1; 

Ref. 26, pp. 3, 311; Ref. 48, pp. 1-2). 

Although low levels of PAHs are consistent with oil waste, these contaminants are also present within 

the CERCLA hazardous waste. In addition, elements such as chromium, mercury, and zinc are present 

within Source 1 and these contaminants are not associated with OPA wastes, but with the RCRA 

hazardous K048 through K052 wastes (Ref. 31, pp. 12-16, 18-23, 25). 

2.4.2 Hazardous Waste Quantity

2.4.2.1 Source Hazardous Waste Quantity

2.4.2.1.1 Tier A: Hazardous Constituent Quantity- Not Evaluated (NE) 

The hazardous constituent quantity for Source 1 could not be adequately determined according to HRS 

requirements; that is the total mass of all Comprehensive Environmental Response, Compensation, and 

Liability Act (CERCLA) hazardous substances in the source is not known and cannot be estimated 

with reasonable confidence (Ref. 1, S ection 2.4.2.1.1). T here are insufficient historical and current 

data (manifests, potentially responsible party (PRP) records, State records, permits, waste 

concentration data, etc.) available to adequately calculate the total mass of all CERCLA hazardous 

substances in the source and the associated releases from the source. Therefore, there is insufficient 

information to evaluate the associated releases from the source to calculate the hazardous constituent 

quantity for Source 1 w ith reasonable confidence. S coring proceeds to the evaluation of Tier B, 

hazardous wastestream quantity (Ref. 1, Section 2.4.2.1.2). 

2.4.2.1.2 Tier B: Hazardous Wastestream Quantity- Not Evaluated (NE)

The hazardous wastestream quantity for Source 1 could not be adequately determined according to 

HRS requirements; that is the mass of the wastestream plus the mass of any additional CERCLA 

pollutants and contaminants that are allocated to the source is not known and cannot be estimated with 

reasonable confidence (Ref. 1, S ection 2.4.2.1.2). T here are insufficient historical and current data 

(manifests, PRP records, State records, permits, waste concentration data, etc.) available to adequately 

calculate the mass of the wastestream plus the mass of any additional CERCLA pollutants and 

contaminants in the source and the associated releases from the source. Therefore, there is insufficient 

information to evaluate the associated releases from the source to calculate the hazardous wastestream 

quantity for Source 1 w ith reasonable confidence. S coring proceeds to the evaluation of Tier C, 

volume (Ref. 1, Section 2.4.2.1.3). 

2.4.2.1.3 Tier C: Volume 

The depth of the buried/backfilled ponds could not be accurately determined based on i nformation 

available. Therefore, information is not sufficient to evaluate Tier C and it is not possible to 

adequately determine a volume for Source 1 (Ref. 1, Section 2.4.2.1.3). Source 1 has been assigned a 

value of 0 for the volume measure. Scoring proceeds to the evaluation of Tier D, area (Ref. 1, Section 
Source Characterization – Source 1

HRS Documentation Record 22 MacMillan Ring Free Oil

ARD008049207

2.4.2.1.4).

2.4.2.1.4 Tier D: Area 

An approximate calculation for the area of Source 1 w as performed using GIS software. T he GIS 

software calculated the area of the polygon drawn over the footprint of the buried/backfilled ponds, 

visible by sparse vegetation within a wooded area, as seen on aerial photographs (Ref. 21). The GIS 

software calculated the area of the buried/backfilled Ponds 710 through 712 to be 81,300 ft2 (Ref. 21, 

pp. 1-2). T he Tier D equation for assigning a value for the area of a buried/backfilled surface 

impoundment is A/13 (Ref. 1, Table 2-5). Calculations for Ponds 710 through 712 are as follows:

Ponds 710 - 712: 81,300 square feet

Area of Source 1 (ft2): 81,300 

Area Assigned Value = 81,300/13 

Area Assigned Value = 6,253.846 

2.4.2.1.5 Source Hazardous Waste Quantity Value

Per the HRS, the highest of the values assigned to the source for hazardous constituent quantity (Tier 

A), hazardous wastestream quantity (Tier B), Volume (Tier C), and Area (Tier D) should be assigned 

as the source hazardous waste quantity value (Ref. 1, Section 2.4.2.1.5). 

 

 

Tier Evaluated Source 1 Values

A Not Evaluated

B Not Evaluated

C 0 

D 6,253.846

Source Hazardous Waste Quantity Value: 6,253.846 
Source Characterization - Source 2

HRS Documentation Record 23 MacMillan Ring Free Oil

ARD008049207

SOURCE DESCRIPTION

2.2 Source Characterization 

Source Description: Source 2 – DAF Settling Unit (Ponds 704, 705, 706, and 707) 

Source Type

The area to the southwest of the former MacMillan Refinery and west of the firewater pond contained 

four surface impoundments (ponds) (Source 5), covering an area of approximately 193,660 ft2

, which 

had historically been used by MacMillan operations to store DAF sludge (Ref. 21; Ref. 27, p. 3). DAF 

sludge is a listed hazardous waste due to the presence of hexavalent chromium and lead in the DAF 

float materials (Ref. 27, p. 3) . Therefore DAF sludge is considered a K048 through K052 listed 

hazardous waste that is CERCLA eligible (Ref. 20, pp. 1-4; Ref. 45, p. 15). In historical reports, these 

surface impoundments are referred to as Ponds 704, 705, 706, and 707 (Ref. 23, p. 57, 163; Ref. 27, p. 

2). These surface impoundments (ponds) were located in a series and were connected to each other by 

flow lines. The DAF float gravity flowed via a 6-inch line to Pond 706 where the sludge settled to the 

bottom of the pond. Water from Pond 706 flowed via a flow line below the surface to Pond 705 and 

again via a flow line to Pond 707 (Ref. 27, pp. 2, 3). Pond 704 (also called 5-acre Pond) was utilized

as wastewater treatment pond that received runoff of the CERCLA wastes from Ponds 705-707 when 

they were full and overflowing (Ref. 10, p. 28; Ref, 23, pp. 27, 40). Pond 704 was believed to be 

connected to Ponds 705-707 via underground pipes and/or broken earthen levees (Ref. 43, p. 2). 

Together all these ponds operated as a DAF settling unit. EPA estimated that the total capacity of the 

ponds (Source 5) was approximately 30,000 cubic yards (Ref. 23, p. 27). In 1992, ADPC&E noted 

that Pond 705 contained evidence of oily staining and the berm had collapsed on the far south side 

allowing liquid to flow freely into Pond 707. Pond 706 had evidence of oily staining and dead 

vegetative growth around the pond. Pond 707’s berm had also collapsed on the southwest side 

allowing liquid to flow freely into Pond 704 (Ref. 9, p. 24 ). During a 1992 EPA assessment it was 

noted that Pond 704 was full and had recently overflowed to Massey Creek (Ref. 23, p. 40). The DAF

settling units (ponds) operated in the past without any freeboard or liner and overtopping of dikes was

observed (Ref. 20, pp. 49, 77, 78, 80, 82, 83, 156, 157; Ref. 23, p. 27). 

OPA and CERCLA wastes were treated at the same time within 13 separate batches, and 

bioremediated soils from all impoundments (OPA and CERCLA) were used to backfill the 

impoundments (Ref. 8, pp. 26-27; Ref. 45, pp. 5, 6). According to ADPC&E, although Ponds 704-707 

were backfilled with soil that was bioremediated, it is likely that there are affected soils left in place, as 

reportedly the financial resources were not available at the time to meet proposed cleanup criteria (Ref. 

6, p. 81; Ref. 28, pp. 1 -2). Sidewall contamination remained in place, as it was outside the scope of 

EPA Emergency Response Branch actions (Ref. 9, p. 42). The location of the backfilled Ponds 704-

707 (Source 2) is still apparent due to lack of vegetation present; however, individual ponds are no 

longer discernible (Ref. 6, p. 22; Ref. 22, pp. 10-12).

Source 2 is classified as the HRS source type “Buried/Backfilled Surface Impoundment” (Ref. 1, Table 

2-5).
Source Characterization - Source 2

HRS Documentation Record 24 MacMillan Ring Free Oil

ARD008049207

Source Location

 

The backfilled Ponds 704-707 (Source 2) are located on the southwest side of the facility just west and 

southwest of the firewater pond (Attachment A Figure A-2; Ref. 6, p. 99).

Source Containment

Release To Surface Water

The backfilled Ponds 704-707, Source 2, do not have a maintained engineered cover, no liner, and no 

functioning or maintained run-on control system or runoff management system (Ref. 6, p. 81; Ref. 15, 

p. 65; Ref. 20, p. 38) . Although the ponds have been backfilled, placement of an impermeable 

membrane was deemed too expensive during the closeout of the ponds (Ref. 28, p. 2). 

 Containment Value: 10

2.4.1 Hazardous Substances

Sampling conducted in 1992 on the sludge from the pits before removal activities were conducted, had 

the following chromium levels detected in them. Pond 704 contained 77.9 mg/kg of chromium, Pond 

705 contained 183 mg/kg of chromium, Pond 706 contained 138 mg/kg of chromium, and Pond 707 

contained 97.7 mg/kg of chromium (Ref. 46, pp. 44-47; Ref. 47, p. 2).

During previous investigations, liquid waste (MW-1 and MW-5) and soil (NCI-9) samples were

collected from the area of Ponds 704, 705, 706, and 707 (Source 2). During ADPC&E sampling in 

1990, elevated levels of PAHs and approximately 15 gallons of oil were found in MW-1 (Ref. 6, p. 79; 

Ref. 11, p. 9). In 1992, EPA contractors found elevated concentrations of SVOCs naphthalene and 

phenol detected in samples from MW-5 (Ref. 6, p. 80). In 1996 and 1997, EPA contractors found 2

feet of waste in MW-1 and a number of PAHs, with benzo(a)pyrene detected above the EPA 

maximum contaminant level (Ref. 6, p. 80). As part of the CSA in 2011, ADEQ contractors found 

lead in liquid waste from MW-1 and hexavalent chromium in surface soil at a concentration of 1.7 

mg/kg from NCI-9, above EPA Regional Screening Levels (Ref. 6, pp. 93, 99).

As part of SR sampling of MacMillan from 13 through 17 August 2012, EPA contractors collected one 

liquid waste sample from the location of the former ponds, Source 2 (Ref. 5, pp. 5; Ref. 22, p. 16; Ref. 

25, p. 21). The sample contained two layers, with liquid waste visible on water (Ref. 22, p. 16). The 

sample was analyzed for TCL VOCs, TCL SVOCs, pesticides, and PCBs by the CLP SOW for MultiMedia, Multi-Concentration Organic Analysis, OLM04.2, and TAL metals with mercury by CLP 

SOW Multi-Media, Multi-Concentration Inorganics Analysis, ISM05.3 (Ref. 25, p. 23). TCL SVOCs 

were also analyzed by EPA SW 846 Method 8270 for low-level PAHs (Ref. 26, pp. 431-432). T he 

sample was submitted to the EPA Region 6 E nvironmental Services Branch Laboratory, located in 

Houston, Texas (Ref. 5, p. 5; Ref. 26, pp. 1, 309, 431). 

MW-1 was placed adjacent to and downgradient of Source 2 in 1987, as part of the closure of the 

impoundments and in order to monitor the contamination from the former hazardous waste 

management unit (Ref. 6, p. 79) . Therefore samples from MW-1 are indicative of the waste present 
Source Characterization - Source 2

HRS Documentation Record 25 MacMillan Ring Free Oil

ARD008049207

within Source 2. Analytical evidence of the contamination associated with Source 2 located on the 

MacMillan site is summarized below. 

Hazardous

Substance

Evidence

References Sample ID Concentration

(mg/L) 

Reporting Limit1

(mg/L) 

EPA SR Sampling Activities – August 2012 

Chromium MW-1-120816-21 0.6 0.09 Ref. 26, pp. 1-3, 197; Ref. 30, p. 25

Lead MW-1-120816-21 0.6 0.09 Ref. 26, pp. 1-3, 197; Ref. 30, p. 25

Vanadium MW-1-120816-21 1.6 0.2 Ref. 26, pp. 1-3, 197; Ref. 30, p. 25

2-Methylnaphthalene MW-1-120816-21 3.49 J 2.29 Ref. 26, pp. 431-433, 608; Ref. 30, p. 25

Acenaphthylene MW-1-120816-21 2.74 J 2.29 Ref. 26, pp. 431-433, 608; Ref. 30, p. 25

Anthracene MW-1-120816-21 11.2 J 2.29 Ref. 26, pp. 431-433, 608; Ref. 30, p. 25

Benzo(a)anthracene MW-1-120816-21 9.48 J 2.29 Ref. 26, pp. 431-433, 608; Ref. 30, p. 25

Benzo(a)pyrene MW-1-120816-21 2.88 J 2.29 Ref. 26, pp. 431-433, 608; Ref. 30, p. 25

Beno(k)fluoranthene MW-1-120816-21 2.42 J 2.29 Ref. 26, pp. 431-433, 608; Ref. 30, p. 25

Chrysene MW-1-120816-21 14.7 J 2.29 Ref. 26, pp. 431-433, 608; Ref. 30, p. 25

Fluoranthene MW-1-120816-21 4.11 J 2.29 Ref. 26, pp. 431-433, 608; Ref. 30, p. 25

Fluorene MW-1-120816-21 6.16 J 2.29 Ref. 26, pp. 431-433, 608; Ref. 30, p. 25

Naphthalene MW-1-120816-21 2.63 J 2.29 Ref. 26, pp. 431-433, 608; Ref. 30, p. 25

Phenanthrene MW-1-120816-21 9.2 J 2.29 Ref. 26, pp. 431-433, 608; Ref. 30, p. 25

Pyrene MW-1-120816-21 32.8 J 2.29 Ref. 26, pp. 431-433, 608; Ref. 30, p. 25

Notes:

mg/kg = milligrams per kilogram = 1,000 micrograms per kilogram (μg/kg) 

J Identification of analytes is acceptable; the reported value is an estimate because the samples were extracted past holding time. 

Concentrations should be considered minimum values (Ref. 26, p. 432). These estimated values are biased low (Ref. 26, p. 432; Ref. 

50, p. 1). 1 The Reporting Limit (RL) terminology used by the EPA Region 6 Laboratory is adjusted for sample aliquot, sample volume, and 

dilutions for the analysis and meets the definition of Sample Quantitation Limit (SQL) as defined by the HRS (Ref. 1, Section 1.1; 

Ref. 26, pp. 3, 311; Ref. 48, pp. 1-2). 

2.4.2 Hazardous Waste Quantity

2.4.2.1 Source Hazardous Waste Quantity

2.4.2.1.1 Tier A: Hazardous Constituent Quantity - Not Evaluated (NE) 

The hazardous constituent quantity for Source 2 could not be adequately determined according to HRS 

requirements; that is the total mass of all CERCLA hazardous substances in the source is not known 

and cannot be estimated with reasonable confidence (Ref. 1, Section 2.4.2.1.1). There are insufficient 

historical and current data (manifests, potentially responsible party (PRP) records, State records, 

permits, waste concentration data, etc.) available to adequately calculate the total mass of all CERCLA 

hazardous substances in the source and the associated releases from the source. Therefore, there is 

insufficient information to evaluate the associated releases from the source to calculate the hazardous 

constituent quantity for Source 2 with reasonable confidence. Scoring proceeds to the evaluation of 

Tier B, hazardous wastestream quantity (Ref. 1, Section 2.4.2.1.2). 
Source Characterization - Source 2

HRS Documentation Record 26 MacMillan Ring Free Oil

ARD008049207

2.4.2.1.2 Tier B: Hazardous Wastestream Quantity - Not Evaluated (NE)

The hazardous wastestream quantity for Source 2 could not be adequately determined according to 

HRS requirements; that is the mass of the wastestream plus the mass of any additional CERCLA 

pollutants and contaminants that are allocated to the source is not known and cannot be estimated with 

reasonable confidence (Ref. 1, S ection 2.4.2.1.2). T here are insufficient historical and current data 

(manifests, PRP records, State records, permits, waste concentration data, etc.) available to adequately 

calculate the mass of the wastestream plus the mass of any additional CERCLA pollutants and 

contaminants in the source and the associated releases from the source. Therefore, there is insufficient 

information to evaluate the associated releases from the source to calculate the hazardous wastestream 

quantity for Source 2 with reasonable confidence. Scoring proceeds to the evaluation of Tier C, 

volume (Ref. 1, Sec. 2.4.2.1.3). 

2.4.2.1.3 Tier C: Volume 

The depth of the buried/backfilled ponds, Source 2, could not be accurately determined based on 

information available. Therefore, information is not sufficient to evaluate Tier C and it is not possible 

to adequately determine a volume for Source 2. Source 2 has been assigned a value of 0 for the 

volume measure (Ref. 1, Section 2.4.2.1.3). Scoring proceeds to the evaluation of Tier D, area (Ref. 1, 

Section 2.4.2.1.4).

2.4.2.1.4 Tier D: Area 

An approximate calculation for the area of Source 2 was performed using GIS software. T he GIS 

software calculated the area of the polygon drawn over the footprint of the buried/backfilled Ponds 

704-707, visible by sparse vegetation west and southwest of the fire water pond, a s seen on aerial 

photographs (Ref. 21). The GIS software calculated the area of the buried/backfilled Ponds 704-707 to 

be 193,660 ft2 (Ref. 21, pp. 1, 3) . T he Tier D equation for assigning a value for area of a 

buried/backfilled surface impoundment is A/13 (Ref. 1, Table 2-5). Calculations are as follows:

Ponds 704-707 = 193,660 square feet

Area of Source 2 (ft2

): 193,660 

Area Assigned Value = 193,660/13 

Area Assigned Value = 14,896.923 

2.4.2.1.5 Source Hazardous Waste Quantity Value

According to the HRS, the highest of the values assigned to the source for hazardous constituent 

quantity (Tier A), hazardous wastestream quantity (Tier B), volume (Tier C), and area (Tier D) should 

be assigned as the source hazardous waste quantity value (Ref. 1, Section 2.4.2.1.5). 
Source Characterization - Source 2

HRS Documentation Record 27 MacMillan Ring Free Oil

ARD008049207

Tier Evaluated Source 2 Values

A Not Evaluated

B Not Evaluated

C 0 

D 14,896.923

Source Hazardous Waste Quantity Value 14,896.923
Source Characterization 

HRS Documentation Record 28 MacMillan Ring Free Oil

ARD008049207

Other Sources Not Scored

A set of five aboveground storage tanks (ASTs) used for the storage of oil are located east of the 

former refinery (Ref. 6, p. 22). While MacMillan was operating, there were six ASTs at this location 

that had a total capacity of 20,000 gallons each (Ref. 27, p. 11). In 1992, it was observed that one of 

these ASTs had leaked a hard asphalt substance, and it appeared that as weather temperatures rose, this 

substance would liquefy and start to flow from the ASTs (Ref. 23, p. 50). These tanks were insulated 

with an open cell foam insulation that was covered with a corrugated metal protective skin. The metal 

skin was missing from several large areas of the tanks and the foam insulation was observed falling to 

the ground during field activities conducted by ADEQ contractors in 2011 (Ref. 6, p. 22). Currently 

these ASTs (tanks) are in various stages of disrepair, and some tanks have been completely or partially 

removed. S urface soil staining (black, petroleum hydrocarbon) is extensive in the area of the tank 

farm (Ref. 6, p. 87; Ref. 22, pp. 8 -10). R unoff is visible through continuous staining along the 

drainage ditches leading off-property (Ref. 6, p. 87, 133, 134, 140; Ref. 22, pp. 8-10). 

As part of the CSA in 2011, ADEQ contractors collected surface soil samples in the vicinity of the 

tank farm. Diesel-range organics were detected in the vicinity of the tank farm and to the southeast 

(Ref. 6, p. 87). 

As part of SR sampling of MacMillan from 13 through 17 August 2012, EPA contractors collected two 

solid waste samples from around the tank farm (Ref. 5, pp. 5; Ref. 22, pp. 10-12; Ref. 25, p. 21). The 

samples were analyzed for TCL VOCs, TCL SVOCs, pesticides, and PCBs by the CLP SOW for 

Multi-Media, Multi-Concentration Organic Analysis, OLM04.2, and TAL metals with mercury by 

CLP SOW Multi-Media, Multi-Concentration Inorganics Analysis, ILM05.3 (Ref. 25, p. 23) . TCL 

SVOCs were also analyzed by EPA SW 846 Method 8270 for low-level PAHs (Ref. 26, pp.431-432). 

The samples were submitted to the EPA Region 6 Environmental Services Branch Laboratory, located 

in Houston, Texas (Ref. 5, p. 5; Ref. 26, pp. 1, 309, 431). 

Analytical evidence of the contamination associated with the tanks located on the MacMillan site is 

summarized below. 

Hazardous

Substance

Evidence

References Sample ID Concentration

(mg/kg)

Reporting Limit1

(mg/kg)

EPA SR Sampling Activities – August 2012 

Benzo(a)anthracene TS-01-03-51 0.0205 J 0.0129 Ref. 26, pp. 431-433, 530; Ref. 30, p. 8

Benzo(a)pyrene TS-01-03-51 0.0251 J 0.0129 Ref. 26, pp. 431-433, 530; Ref. 30, p. 8

Benzo(k)fluoranthene TS-01-03-51 0.245 J 0.0129 Ref. 26, pp. 431-433, 530; Ref. 30, p. 8

Benzo(g,h,i)perylene TS-01-03-51 0.0703 J 0.0129 Ref. 26, pp. 431-433, 530; Ref. 30, p. 8

Chrysene TS-01-03-51 1.34 J 0.0517 Ref. 26, pp. 431-433, 530; Ref. 30, p. 8

Dibenz(a,h)anthracene TS-01-03-51 0.0187 J 0.0129 Ref. 26, pp. 431-433, 530; Ref. 30, p. 8

Indeno(1,2,3-cd)pyrene TS-01-03-51 0.0196 J 0.0129 Ref. 26, pp. 431-433, 530; Ref. 30, p. 8

Phenanthrene TS-01-03-51 0.0216 J 0.0129 Ref. 26, pp. 431-433, 530; Ref. 30, p. 8

Pyrene TS-01-03-51 0.205 J 0.0129 Ref. 26, pp. 431-433, 530; Ref. 30, p. 8
Source Characterization 

HRS Documentation Record 29 MacMillan Ring Free Oil

ARD008049207

Hazardous

Substance

Evidence

References Sample ID Concentration

(mg/kg)

Reporting Limit1

(mg/kg)

Arsenic TS-01-03-51 1.3 0.5 Ref. 26, pp. 1-3, 105; Ref. 30, p. 8

Chromium TS-01-03-51 1.3 1.0 Ref. 26, pp. 1-3, 109; Ref. 30, p. 8

Lead TS-01-03-51 10.0 0.5 Ref. 26, pp. 1-3, 109; Ref. 30, p. 8

Manganese TS-01-03-51 25.4 J* 0.5 Ref. 26, pp. 1-3, 109; Ref. 30, p. 8

Vanadium TS-01-03-51 3.0 2.1 Ref. 26, pp. 1-3, 109; Ref. 30, p. 8

Zinc TS-01-03-51 13.7 2.1 Ref. 26, pp. 1-3, 109; Ref. 30, p. 8

Benzo(a)anthracene TS-02-03-51 0.0791 J 0.0131 Ref. 26, pp. 431-433, 534; Ref. 30, p. 8

Benzo(a)pyrene TS-02-03-51 0.0729 J 0.0131 Ref. 26, pp. 431-433, 534; Ref. 30, p. 8

Benzo(k)fluoranthene TS-02-03-51 0.298 J 0.0131 Ref. 26, pp. 431-433, 534; Ref. 30, p. 8

Benzo(g,h,i)perylene TS-02-03-51 0.0957 J 0.0131 Ref. 26, pp. 431-433, 534; Ref. 30, p. 8

Chrysene TS-02-03-51 1.38 J 0.0523 Ref. 26, pp. 431-433, 534; Ref. 30, p. 8

Dibenz(a,h)anthracene TS-02-03-51 0.0269 J 0.0131 Ref. 26, pp. 431-433, 534; Ref. 30, p. 8

Indeno(1,2,3-cd)pyrene TS-02-03-51 0.0332 J 0.0131 Ref. 26, pp. 431-433, 534; Ref. 30, p. 8

2-Methylnaphthalene TS-02-03-51 0.0163 J 0.0131 Ref. 26, pp. 431-433, 534; Ref. 30, p. 8

Naphthalene TS-02-03-51 0.0141 J 0.0131 Ref. 26, pp. 431-433, 534; Ref. 30, p. 8

Phenanthrene TS-02-03-51 0.0304 J 0.0131 Ref. 26, pp. 431-433, 534; Ref. 30, p. 8

Pyrene TS-02-03-51 0.200 J 0.0131 Ref. 26, pp. 431-433, 534; Ref. 30, p. 8

Arsenic TS-02-03-51 1.8 0.5 Ref. 26, pp. 1-3, 113; Ref. 30, p. 8

Chromium TS-02-03-51 4.5 1.0 Ref. 26, pp. 1-3, 113; Ref. 30, p. 8

Lead TS-02-03-51 9.3 0.5 Ref. 26, pp. 1-3, 113; Ref. 30, p. 8

Manganese TS-02-03-51 12.9 0.5 Ref. 26, pp. 1-3, 113; Ref. 30, p. 8

Mercury TS-02-03-51 0.10 0.072 Ref. 26, pp. 1-3, 114; Ref. 30, p. 8

Vanadium TS-02-03-51 11.1 1.9 Ref. 26, pp. 1-3, 113; Ref. 30, p. 8

Zinc TS-02-03-51 8.3 1.9 Ref. 26, pp. 1-3, 113; Ref. 30, p. 8

Notes:

mg/kg = milligrams per kilogram = 1,000 micrograms per kilogram (μg/kg)

J Identification of analytes is acceptable; the reported value is an estimate because the samples were extracted past holding time. 

Concentrations should be considered minimum values (EPA Region 6 data, p. 432). These estimated values are biased low (Ref. 26, 

p. 432; Ref. 50, p. 1). 

J* For Identification of analyte is acceptable; the reported value is an estimate due to outlying quality control parameters (Ref. 26, pp. 3, 

695). These estimated values are biased low as the samples were extracted out of the hold time (Ref. 26, p. 432; Ref. 50, p. 1). 1 The Reporting Limit (RL) terminology used by the EPA Region 6 Laboratory is adjusted for sample aliquot, sample volume, and 

dilutions for the analysis and meets the definition of Sample Quantitation Limit (SQL) as defined by the HRS (Ref. 1, Section 1.1; 

Ref. 26, pp. 3, 311; Ref. 48, pp. 1-2). 
Source Characterization 

HRS Documentation Record 30 MacMillan Ring Free Oil

ARD008049207

SITE SUMMARY OF SOURCE DESCRIPTIONS

Source

No.

Source Hazardous 

Waste Quantity

Value

Containment Factor Value

Ground Water Surface Water Gas Air Particulate

1 6,253.846 NE 10 NE NE

2 14,896.923 NE 10 NE NE

TOTAL 21,150.769

 NE = Not Evaluated
GW Migration Pathway

HRS Documentation Record 31 MacMillan Ring Free Oil

ARD008049207

3.0 GROUND WATER MIGRATION PATHWAY SCORE - NOT SCORED

The ground water migration pathway will not be scored because it is not expected to contribute 

significantly to the Site score. The Site score already exceeds 28.50 based only on the evaluation of 

the surface water pathway.

Ground water samples were collected during the sampling events conducted by ADEQ in 1987 and 

1990; by EPA contractors in 1994, 1996, and 1997; by ADEQ contractors during the 2011 CSA 

conducted, and by EPA contractors during the 2012 SR. During these events, elevated levels of PAHs 

were detected in several wells located throughout the facility (Ref. 6, pp. 79, 80, 94, 144). Total 

chromium was detected in monitoring wells located on the east side of the facility in 2011, as well as 

total lead in several locations throughout the facility (Ref. 6, p. 86). Hexavalent chromium and lead 

were also detected in a monitoring well (NCI-3) located on the east side of the Site in 2012 (Ref. 5, p. 

14). During the 2012 EPA SR, passive soil gas (PSG) samples were collected at the leading edge of 

historical plume boundary which was identified during the 2011 CSA sampling event (Ref. 5, pp. 4; 

20; Ref. 6, pp. 94-98). The samples were analyzed for VOCs. Only one TPH value, slightly above 

detection limits was detected (Ref. 5, p. 18). Results indicated that the plume’s predominant direction 

is away from the school.
SW Pathway – Overland/Flood Migration

HRS Documentation Record 32 MacMillan Ring Free Oil

ARD008049207

4.0 SURFACE WATER MIGRATION PATHWAY

4.1 OVERLAND/FLOOD MIGRATION COMPONENT

4.1.1 General Considerations

4.1.1.1 Definition of Hazardous Substance Migration Path for Overland/Flood Component 

The hazardous substance migration path includes both the overland and the in-water segment that 

hazardous substances would take as they migrate away from sources at the site (Ref. 1, S ection 

4.1.1.1). Hazardous substance migration paths overland and in-water segments for Sources 1 through 

5 are described in the following text. The surface water pathway is presented on Figures A-3 and A-4. 

Overland Segments

Topography of the MacMillan Ring Free Oil property slopes to the east and to the south, as described 

in the paragraphs below. The eastern slope that guides source contamination to the probable points of 

entry on the eastern side of the property is 5%, or 11.28o (Ref. 3, p. 1; Ref. 40, p. 1). 

Source 1 – Buried/Backfilled Ponds 710, 711, and 712 

A Probable Point of Entry (PPE), referred to as PPE1 (location DD-01), exists downgradient and to the 

east of the backfilled Pond 712 (Source 1) (Ref. 5, p. 13; Ref. 30, p. 9; Ref. 39, pp. 1-2). Surface water 

runoff emanating from the barren area of the former pond flows east, following the natural topography 

approximately 40 feet east toward Hayes Creek, entering the creek at DD-01 (PPE1) (Ref. 5, p. 13; 

Ref. 30, p. 9 ; Ref. 39, pp. 1 -2). On the southeast end of Source 1, surface water runoff flows 

east/southeast and flows through a pipe located at DD-05 which abuts the former pond (Ref. 22, p. 15). 

From the pipe, flow continues south along a drainage ditch for approximately 95 feet before entering 

the loop to Hayes Creek at DD-02 (PPE2) (Ref. 39, pp. 1, 2; Ref. 42, p. 1). 

From Pond 711 of Source 1, drainage occurs to the southeast and enters the adjacent wetland, 

contiguous to Hayes Creek, at PPE5 with a minimal (>0) overland flow distance (Ref. 5, p. 13; Ref. 

22, p. 3; Ref. 30, p. 9; Ref. 39, pp. 1-2). 

From Pond 710 of Source 1, drainage occurs to the southeast and enters the adjacent wetland 

contiguous to Hayes Creek at PPE4 with a minimal (>0) overland flow distance (Ref. 22, p. 3; Ref. 39, 

pp. 1-2).

Source 2 – Buried/Backfilled Ponds 704-707 

Runoff/overflow emanating from the backfilled Ponds 704-707 historically and currently surface flows 

south through drainage ditches approximately 2,500 feet to Massey Creek via PPE6 (Ref. 3, p. 1; Ref. 

6, pp. 26, 44; Ref. 15, pp. 64, 68; Ref. 39, pp. 1, 3). The majority of wastes emanating from Source 2 

is subsurface as evident through the wastes found in MW-1, and discharges through active seeps 

present throughout the property (Ref. 6, pp. 12, 22, 123; Ref. 15, pp. 14, 15, 17-21; Ref. 22, p. 16). 

Overland flow from Source 2 also follows surface topography gradient to the north-northeast toward

Hayes Creek for approximately 1,000 feet to an active seep (RD-02) (Ref. 6, pp. 13, 43). The active 

seep was sampled during the 2012 SR activities (RD-02) (Ref. 22, p. 9). From this location overland 

flow continues north approximately 175 feet along the drainage ditch located on the eastern side of the 

railroad spurs, until it in tercepts a corrugated culvert (located at OP-01). T he corrugated culvert 
SW Pathway – Overland/Flood Migration

HRS Documentation Record 33 MacMillan Ring Free Oil

ARD008049207

continues east under the railroad tracks and a dirt road another 105 f eet and discharges through a 

second outfall pipe (OP-02) (Ref. 5, p.13; Ref. 22, p. 12; Ref. 30, pp. 3, 10; Ref. 39, pp. 1-2). From 

here, the overland flow travels through a ditch approximately 150 feet east and empties into a manmade pond, which currently serves as wetland habitat, via PPE3 (Ref. 5, p. 13; Ref. 16, pp. 1-13; Ref. 

22, p. 13; Ref. 30, p. 10; Ref. 39, pp. 1-2). 

The outer banks of Hayes Creek are located in Federal Emergency Management Association (FEMA) 

Flood Zone A. Flood Zone A is subject to inundation by the 1% annual chance of flood (Ref. 24, pp. 

1-3). This increases the chances that chemicals emanating from the MacMillan Site will be carried 

downstream. In addition, the contiguous wetland and Hayes Creek constitutes the beginning of the inwater segment for the surface water pathway.

In-Water Segments

The in-water segment begins at the PPE to an eligible surface water body as defined in the HRS (Ref. 

1, Sec. 4.1.1). E ligible surface water bodies that have been determined to be part of the in-water 

segment for the MacMillan Site include the wetland contiguous to Hayes Creek, Hayes Creek, Massey 

Creek, Flat Creek, Haynes Creek, Smackover Creek, and the Ouachita River (Attachment A, Figure A4; Ref. 3, pp. 1-3; Ref. 30, pp. 1, 2 ; Ref. 41, pp. 1-2). All of the surface water bodies within the inwater segment are perennial and, therefore, eligible for HRS scoring (Ref. 1, Sec. 4.0.2; Ref. 42, p. 1; 

Ref. 49, pp. 1-3) 

The Target Distance Limit (TDL) is defined as being 15 miles from the farthest downstream PPE in 

the in-water segment section (Ref. 1, S ec. 4.1.1.2). T he TDL of the surface water flow path is 

presented in Attachment A, Figure A-4 and is described in the following paragraphs. 

Drainage from Source 1 enters Hayes Creek at locations DD-01 (PPE1) and DD-02 (PPE2). Drainage 

on the south end of Source 1 enters the wetland contiguous to Hayes Creek at PPE4 and PPE5. 

Drainage from Source 2 enters Massey Creek from PPE6 (Attachment A, Figure A-3; Ref. 5, p. 13 ; 

Ref. 15, p. 68; Ref. 39, pp. 1, 2). 

PPE2 and PPE6 are the farthest downstream PPEs. From PPE2, Hayes Creek flows for 1.07 miles 

before its confluence with Flat Creek. From PPE6, Massey Creek flows for 2.65 miles before its 

confluence with Flat Creek. Flat Creek flows eastward for 1.86 miles before flowing into Haynes 

Creek. Haynes Creek meanders northeast for 5.46 miles before joining Smackover Creek. Smackover 

Creek meanders 4.48 miles before flowing into the Ouachita River. T he in-water segment of the 

surface water pathway continues for 0.15 miles from PPE6 and 2.13 miles from PPE2 in the Ouachita 

River until the pathway extent reaches 15 miles, just northwest of Babb Lake (Attachment A, Figure 

A-4; Ref. 3, p. 1-3; Ref. 41, pp. 1, 2). 
SW Pathway – Likelihood of Release

HRS Documentation Record 34 MacMillan Ring Free Oil

ARD008049207

4.1.2.1 LIKELIHOOD OF RELEASE

4.1.2.1.1 Observed Release

 

Direct Observation

Observed Release is established by direct observation. Evidence of sources flooding with material 

containing hazardous substances in direct contact with the surface water exists. Several overflows to 

Hayes Creek from the DAF impoundments and other impoundments have historically occurred (Ref. 

8, pp. 5-6, 9; Ref. 9, pp. 1-2, 6). During the 1980s, several overflows to Hayes Creek from the ponds 

were documented (Ref. 8, pp. 5-6, 9). In December 1982 and January 1983, floods in the area caused 

oily materials containing hazardous substances to release from the ponds and cover approximately 150 

to 200 acres of Ouachita River bottom between Calion and Campanolle Landing (Ref. 8, p. 14; Ref. 9, 

pp. 1-2, 6). 

On 6 S eptember 1990, during an ADPC&E inspection of the facility, the inspector observed 

unpermitted discharge of pond fluids to an unnamed creek (Hayes Creek) (Ref. 9, p. 10). 

Between 28 M ay and 20 June 1992, cleanup of affected vegetation along Hayes Creek took place. 

Cleanup involved placing numerous sections of sorbent boom in the creek to contain free floating oil 

and the collection of oily contaminated materials from the creek banks. Due to the large amount of 

oily soaked vegetation along the creek bed, a controlled burn took place. The oily soaked materials 

that were not suitable for burning were placed in roll-off boxes for disposal (Ref. 8, p. 11). 

On 13 July 1994, ADPC&E representatives found evidence of a release from the ponds located east of 

the railroad tracks. Visual staining was observed on the berms of the ponds and along the banks of 

Hayes Creek (Ref. 9, p. 37). 

Chemical Analysis

As well as an observed release by direct observation, an observed release by chemical analysis is

established. In 1985, during an inspection, EPA contractors sampled the east side of the property (Ref. 

20, pp. 11, 19, 20) . Analytical results detected elevated concentrations of organics (mainly unknown 

compounds) as well as lead from the Pond 712 bank, the pathway between the pond and Hayes Creek, 

and from within Hayes Creek (Ref. 20, p. 11). 

During the August 2012 SR sampling activities conducted by EPA contractors, surface water and 

sediment samples collected from within the surface water pathway demonstrated elevated 

concentrations of hazardous substances (Ref. 5, p. 4). For the purpose of this report, only the sediment 

samples are being presented, as the sediment samples alone provide sufficient evidence to establish an 

observed release. Two sediment samples were collected from the wetland contiguous to Hayes Creek 

and twelve sediment samples were collected from within Hayes Creek (Ref. 5, p. 4). Sample locations 

are depicted in Figure A-5 of Attachment A. 
SW Pathway – Likelihood of Release

HRS Documentation Record 35 MacMillan Ring Free Oil

ARD008049207

Background Concentrations

A background sediment sample was collected from Hayes Creek (BG-01) approximately 1,000 feet

upstream and upgradient of the site (Attachment A, Figure A-5; Ref. 25, p. 4) . The background 

sediment sample collected from Hayes Creek is compared to site-related sediment samples collected 

from the wetland contiguous to Hayes Creek and Hayes Creek in order to illustrate an observed release

from the site to the surface water pathway can be established (Ref. 5, p. 4; Ref. 25, pp. 13, 21).

The background sediment sample was collected on 16 August 2012 by EPA contractors. The sediment 

sample was collected from 0 to 2 inches below ground surface (bgs) with disposable plastic scoops 

then transferred directly to the appropriate sample containers. The sample was collected from within 

the creek where sediments had accumulated (Ref. 5, p. 4). Once collected, the sediment sample bottles 

were placed on ice until shipping (Ref. 5, p. 4; Ref. 25, p. 20). The background sample and the samples 

collected to demonstrate the presence of contamination in the overland flow path and to demonstrate 

an observed release were all collected during the same time frame during the same sampling event 

(Ref. 5, p. 4). The samples were collected by the same field team during the same sampling event, 

following the same sample collection protocols and methodologies. T he background sample was 

collected from a similar location (within Hayes Creek), was from similar media (the sediment/soil type 

at Hayes Creek is similar to the eastern end of the wetland), same depth, used the same sampling 

methods, preservation, and handling and were all collected during the same weather conditions as the 

observed release samples (Ref. 5, p. 4; Ref. 16, pp. 2, 6; Ref. 30, pp. 4-13). 

Sediment samples were shipped via Federal Express to the EPA Region 6 Laboratory located in 

Houston, Texas, for VOCs, SVOCs, pesticides, PCBs, TAL metals and mercury analysis and to Test 

America Laboratories, Inc. located in Savannah, Georgia, for hexavalent chromium analysis. The 

samples were analyzed for VOCs , SVOCs, pesticides, and PCBs by CLP COW OLM04.2, for TAL 

metals and mercury by CLP SOW ISM05.3, and hexavalent chromium by EPA Method SW846 

7196A (Ref. 5, p. 5; Ref. 25, p. 23; Ref. 26, pp. 279-306, 401-428, 667-694). 

EPA SR Sampling Event - Background Sample Description

August 2012 

Station Location

(Sample ID) Sample Location Sample Date 

(Military Time) Reference

Sediment

BG-01

(BG-01-03-51)

Hayes Creek upstream of the 

MacMillan Site sources.

08/16/2012

(0710)

Ref. 25, p. 21; Ref. 26, p 299; Ref. 30, p. 

11; Attachment A, Figure A-5 
SW Pathway – Likelihood of Release

HRS Documentation Record 36 MacMillan Ring Free Oil

ARD008049207

EPA SR Sampling Event - Background Sample Concentrations

August 2012 

Summary of MacMillan Designated Background Levels

Hazardous 

Substance Evidence Reference

Station Location/

Sample ID

Concentration

mg/kg

RL1 

mg/kg

Sediment – Hayes Creek

2-Methylnaphthalene BG-01 / BG-01-03-51 0.0058 U 0.0058 Ref. 26, pp. 431-433, 569

Anthracene BG-01 / BG-01-03-51 0.0058 U 0.0058 Ref. 26, pp. 431-433, 569

Benzo(a)anthracene BG-01 / BG-01-03-51 0.0058 U 0.0058 Ref. 26, pp. 431-433, 569

Benzo(a)pyrene BG-01 / BG-01-03-51 0.0058 U 0.0058 Ref. 26, pp. 431-433, 569

Benzo(k)fluoranthene BG-01 / BG-01-03-51

0.0073 J2

(0.073) 0.0058 Ref. 26, pp. 431-433, 569

Benzo(g,h,i)perylene BG-01 / BG-01-03-51 0.0058 U 0.0058 Ref. 26, pp. 431-433, 569

Chrysene BG-01 / BG-01-03-51

0.105 J2

(1.05) 0.0058 Ref. 26, pp. 431-433, 569

Fluoranthene BG-01 / BG-01-03-51 0.0058 U 0.0058 Ref. 26, pp. 431-433, 569

Indeno(1,2,3-cd)pyrene BG-01 / BG-01-03-51 0.0058 U 0.0058 Ref. 26, pp. 431-433, 569

Naphthalene BG-01 / BG-01-03-51

0.0073 J2

(0.073) 0.0058 Ref. 26, pp. 431-433, 569

Phenanthrene BG-01 / BG-01-03-51 0.0058 U 0.0058 Ref. 26, pp. 431-433, 569

Pyrene BG-01 / BG-01-03-51

0.0081 J2

(0.096066) 0.0058 Ref. 26, pp. 431-433, 569

Arsenic BG-01 / BG-01-03-51 0.5 U 0.6 Ref. 26, pp. 1-3, 153

Cadmium BG-01 / BG-01-03-51 1.6 0.6 Ref. 26, pp. 1-3, 153

Chromium BG-01 / BG-01-03-51 1.2 U 1.2 Ref. 26, pp. 1-3, 153

Chromium (VI) BG-01 / BG-01-03-51 1.5 U 1.5 Ref. 19, p. 6

Lead BG-01 / BG-01-03-51 8.8 0.6 Ref. 26, pp. 1-3, 153

Manganese BG-01 / BG-01-03-51 2.5 0.6 Ref. 26, pp. 1-3, 153

Mercury BG-01 / BG-01-03-51 0.066 U 0.066 Ref. 26, pp. 1-3, 154

Vanadium BG-01 / BG-01-03-51 2.7 2.4 Ref. 26, pp. 1-3, 153

Zinc BG-01 / BG-01-03-51 10.5 2.4 Ref. 26, pp. 1-3, 153

Notes:

mg/kg = milligrams per kilogram = 1,000 micrograms per kilogram (μg/kg) 1

 The Reporting Limit (RL) terminology used by the EPA Region 6 Laboratory are detection limits which have been adjusted for sample aliquot, 

sample volume, and dilutions for the analysis and meet the HRS definition of SQL (Ref. 1, Section 1.1, Table 2-3; Ref. 24, p. 4; Ref. 26, pp. 3, 433; 

Ref. 48, pp. 1-2). 2

 Values that have been adjusted according to the EPA Fact Sheet (Ref. 29) are listed in parentheses.

U Not detected at reported quantitation limit (Ref. 26, p. 307).

J Identification of analyte is acceptable; the reported value is an estimate because the samples were extracted past holding time. Concentrations should 

be considered minimum values (Ref. 26, p. 432). These estimated values are biased low (Ref. 26, p. 432; Ref. 50, p. 1). 
SW Pathway – Likelihood of Release

HRS Documentation Record 37 MacMillan Ring Free Oil

ARD008049207

Observed Release Samples

Observed release criteria are met when the hazardous substance is attributable to a release from the 

Site, its concentration exceeds the SQL (including the background SQL), and is at least three times 

greater than the background concentration when the background concentration equals or exceeds its 

SQL (Ref. 1, Table 2-3). 

Sampling locations with hazardous substances meeting observed release criteria are presented below.

EPA SR Sampling Event – August 2012 

Station Location

(Sample ID) Sample Location Sample Date (Military Time) Reference

Hayes Creek

PPE-01

(PPE-01-03-51)

Where loop of Hayes Creek enters main 

branch of Hayes Creek on the north.

08/14/2012

(1310)

Ref. 25, p.21; Ref. 26, pp. 285, 

288; Ref. 30, p.6 

PPE-02

(PPE-02-03-51)

Where loop of Hayes Creek enters main 

branch of Hayes Creek on the south. 

08/14/2012

(1320)

Ref. 25, p.21; Ref. 26, pp. 292, 

298 Ref. 30, p. 7

PPE-04

(DD-01-03-51)

Northern-most PPE at Hayes Creek in a 

section that runs adjacent to former Pond 712. 

08/14/2012

(0830)

Ref. 25, p.22; Ref. 26, pp. 

279,288; Ref. 30, pp. 9, 5

SW-01

(SED-01-03-51)

Within Hayes Creek between north and 

southern sections of loop.

08/14/2012

(1050)

Ref. 25, p.21; Ref. 26, pp. 279, 

288, 291; Ref. 30, p. 6

SW-02

(SED-02-03-51)

Within Hayes Creek approximately 250 feet 

downstream of PPE-02.

08/14/2012

(1340)

Ref. 25, p.21; Ref. 26, pp. 674, 

676; Ref. 30, p. 6

SW-03

(SED-03-03-51)

Within Hayes Creek approximately 100 feet 

downstream of SW-02.

08/14/2012

(1402)

Ref. 25, p.21; Ref. 26, pp. 675, 

676; Ref. 30, p. 7

SW-04

(SED-04-03-51)

Within Hayes Creek approximately 500 feet 

downstream of SW-03.

08/16/2012

(0820)

Ref. 25, p.21; Ref. 26, pp. 688, 

689; Ref. 30, pp. 11, 12

SW-05

(SED-05-03-51)

Within Hayes Creek approximately 100 feet 

downstream of SW-04.

08/16/2012

(0835)

Ref. 25, p.21; Ref. 26, pp. 688, 

690; Ref. 30, pp. 11, 12

DD-02

(DD-03-03-51)

Within loop of Hayes Creek, adjacent to 

wetland area and old weir system and the 

southernmost PPE of Source 1.

08/14/2012

(0900)

Ref. 25, p. 22; Ref. 30, p. 5; 

Attachment A, Figure A-5 

DD-03

(DD-04-03-51)

Within loop of Hayes Creek, located just 

downstream of old weir system. 

08/14/2012

(0920)

Ref. 25, p. 22; Ref. 30, p. 5; 

Attachment A, Figure A-5 

DD-04

(DD-02-03-51)

Field duplicate

(DD-04-03-52)

Within loop of Hayes Creek, located on 

south end before entering the main branch of 

Hayes Creek.

08/14/2012

(1030)

Ref. 25, p. 22; Ref. 30, p. 6 ; 

Attachment A, Figure A-5 

Wetland Contiguous to Hayes Creek

PPE-03

(PPE-03-03-51) PPE3 into wetland area. 08/15/2012(1245)

Ref. 25, p.21; Ref. 26, pp. 294, 

298; Ref. 30, p. 10

WA-01

(WA-01-03-51) Within wetland area. 08/15/2012

(1255)

Ref. 25, p.21; Ref. 26, pp. 294, 

682, 686; Ref. 30, p. 10

The sediment samples were collected on 14 through 18 August 2012 by EPA contractors. The 

sediment samples were collected with disposable plastic scoops and transferred to an appropriate 

sample container. The samples were collected from 0 to 2 inches bgs from locations within the creek
SW Pathway – Likelihood of Release

HRS Documentation Record 38 MacMillan Ring Free Oil

ARD008049207

where sediments had accumulated, such as bends in the creek (Ref. 5, p . 4; Ref. 25, p. 16). Once 

collected, the sediment sample bottles were placed on ice until shipping (Ref. 25, p. 18).

Sediment samples were delivered via Federal Express to the EPA Region 6 Environmental Services 

Branch Laboratory for analysis of VOCs, SVOCs, Pesticides, PCBs, and metals with mercury. 

Sediment samples for analysis of hexavalent chromium were shipped via Federal Express to Test 

America Laboratories, Inc. located in Savannah, Georgia. The samples were analyzed for VOCs, 

SVOCs, pesticides, and PCBs by CLP OLM04.2, for TAL metals and mercury by CLP ILM01.2, and 

for hexavalent chromium by EPA SW846 Method 7196A (Ref. 5, p. 5; Ref. 25, p. 23; Ref. 26, pp. 

279-306, 401-428, 667-694). 

EPA SR Sampling Event – August 2012 

Sediment Samples – Hayes Creek

Station Location

(Sample ID)

Hazardous

Substance

Concentration

mg/kg

RL1

mg/kg Reference

PPE-01

(PPE-01-03-51)

Arsenic 0.80 0.50 Ref. 5, p.26; Ref. 26, pp. 1-3, 57

Chromium 3.4 1.10 Ref. 5, p.26; Ref. 26, pp. 1-3, 57

Chromium (VI) 2.3 1.3 Ref. 5, p.26; Ref. 19, p. 6

Manganese 122 0.50 Ref. 5, p.26; Ref. 26, pp. 1-3, 57

Vanadium 12.0 2.1 Ref. 5, p.26; Ref. 26, pp. 1-3, 57

PPE-02

(PPE-02-03-51)

Anthracene 0.0249 J 0.0244 Ref. 5, p.27; Ref. 26, pp. 431-433, 510

Benzo(a)anthracene 0.0975 J 0.0244 Ref. 5, p.27; Ref. 26, pp. 431-433, 510

Benzo(a)pyrene 0.044 J 0.0244 Ref. 5, p.27; Ref. 26, pp. 431-433, 510

Benzo(g,h,i)perylene 0.0417 J 0.0244 Ref. 5, p.27; Ref. 26, pp. 431-433, 510

Fluoranthene 0.0381 J 0.0244 Ref. 5, p.27; Ref. 26, pp. 431-433, 510

2-Methylnaphthalene 0.0319 J 0.0244 Ref. 5, p.27; Ref. 26, pp. 431-433, 510

Phenanthrene 0.0402 J 0.0244 Ref. 5, p.27; Ref. 26, pp. 431-433, 510

Arsenic 0.90 0.6 Ref. 5, p.27; Ref. 26, pp. 1-3, 90

Chromium 2.6 1.2 Ref. 5, p.27; Ref. 26, pp. 1-3, 89

Manganese 48.7 0.6 Ref. 5, p.27; Ref. 26, pp. 1-3, 89

Vanadium 10.4 2.4 Ref. 5, p.27; Ref. 26, pp. 1-3, 89

PPE-04

(DD-01-03-51)

Benzo(a)anthracene 0.0116 J 0.0097 Ref. 5, p.29; Ref. 26, pp. 431-433, 440

Benzo(a)pyrene 0.0114 J 0.0097 Ref. 5, p.29; Ref. 26, pp. 431-433, 440

Benzo(g,h,i)perylene 0.0146 J 0.0097 Ref. 5, p.29; Ref. 26, pp. 431-433, 440

Arsenic 1.1 1.1 Ref. 5, p.28; Ref. 26, pp. 1-3, 13

Chromium 3.4 2.1 Ref. 5, p.28; Ref. 26, pp. 1-3, 13

Lead 128 1.1 Ref. 5, p.28; Ref. 26, pp. 1-3, 13

Manganese 80.9 1.1 Ref. 5, p.28; Ref. 26, pp. 1-3, 13

Vanadium 8.6 4.2 Ref. 5, p.28; Ref. 26, pp. 1-3, 13

Zinc 59.0 4.2 Ref. 5, p.28; Ref. 26, pp. 1-3, 13

SW-01

(SED-01-03-51)

Chromium 3.1 1.2 Ref. 5, p.28; Ref. 26, pp. 1-3, 85

Manganese 55.1 0.6 Ref. 5, p.28; Ref. 26, pp. 1-3, 85

SW-02

(SED-02-03-51)

Anthracene 0.530 J 0.134 Ref. 5, p.30; Ref. 26, pp. 431-433, 490

Benzo(a)anthracene 1.01 J 0.134 Ref. 5, p.30; Ref. 26, pp. 431-433, 490

Benzo(a)pyrene 0.433 J 0.134 Ref. 5, p.30; Ref. 26, pp. 431-433, 490

Benzo(k)fluoranthene 0.422 J 0.134 Ref. 5, p.30; Ref. 26, pp. 431-433, 490

Benzo(g,h,i)perylene 0.368 J 0.134 Ref. 5, p.30; Ref. 26, pp. 431-433, 490

Chrysene 1.80 J 0.134 Ref. 5, p.30; Ref. 26, pp. 431-433, 490
SW Pathway – Likelihood of Release

HRS Documentation Record 39 MacMillan Ring Free Oil

ARD008049207

Station Location

(Sample ID)

Hazardous

Substance

Concentration

mg/kg

RL1

mg/kg Reference

Fluoranthene 0.567 J 0.134 Ref. 5, p.30; Ref. 26, pp. 431-433, 490

Indeno(1,2,3-c,d)pyrene 0.134 J 0.134 Ref. 5, p.30; Ref. 26, pp. 431-433, 490

2-Methylnaphthalene 0.215 J 0.134 Ref. 5, p.30; Ref. 26, pp. 431-433, 490

Phenanthrene 1.53 J 0.134 Ref. 5, p.30; Ref. 26, pp. 431-433, 490

Pyrene 2.02 J 0.134 Ref. 5, p.30; Ref. 26, pp. 431-433, 490

Arsenic 0.800 0.7 Ref. 5, p.30; Ref. 26, pp. 1-3, 61

Chromium 3.20 1.3 Ref. 5, p.30; Ref. 26, pp. 1-3, 61

Manganese 23.3 0.7 Ref. 5, p.30; Ref. 26, pp. 1-3, 61

Mercury 0.132 0.059 Ref. 5, p.30; Ref. 26, pp. 1-3, 62

Vanadium 8.80 2.7 Ref. 5, p.30; Ref. 26, pp. 1-3, 61

Zinc 42.8 2.7 Ref. 5, p.30; Ref. 26, pp. 1-3, 61

SW-03

(SED-03-03-51)

Anthracene 0.0264 J 0.0157 Ref. 5, p.31; Ref. 26, pp. 431-433, 497

Benzo(a)anthracene 0.110 J 0.0157 Ref. 5, p.31; Ref. 26, pp. 431-433, 497

Benzo(a)pyrene 0.0901 J 0.0157 Ref. 5, p.31; Ref. 26, pp. 431-433, 497

Benzo(k)fluoranthene 0.147 J 0.0157 Ref. 5, p.31; Ref. 26, pp. 431-433, 497

Benzo(g,h,i)perylene 0.104 J 0.0157 Ref. 5, p.31; Ref. 26, pp. 431-433, 497

Chrysene 0.476 J 0.0157 Ref. 5, p.31; Ref. 26, pp. 431-433, 497

Fluoranthene 0.0231 J 0.0157 Ref. 5, p.31; Ref. 26, pp. 431-433, 497

Indeno(1,2,3-c,d)pyrene 0.0325 J 0.0157 Ref. 5, p.31; Ref. 26, pp. 431-433, 497

2-Methylnaphthalene 0.0528 J 0.0157 Ref. 5, p.31; Ref. 26, pp. 431-433, 497

Naphthalene 0.0489 J 0.0157 Ref. 5, p.31; Ref. 26, pp. 431-433, 497

Phenanthrene 0.0489 J 0.0157 Ref. 5, p.31; Ref. 26, pp. 431-433, 497

Pyrene 0.283 J 0.0157 Ref. 5, p.31; Ref. 26, pp. 431-433, 497

Arsenic 0.700 0.7 Ref. 5, p.30; Ref. 26, pp. 1-3, 69

Chromium 2.30 1.3 Ref. 5, p.30; Ref. 26, pp. 1-3, 69

Lead 37.8 0.7 Ref. 5, p.30; Ref. 26, pp. 1-3, 69

Manganese 24.4 0.7 Ref. 5, p.30; Ref. 26, pp. 1-3, 69

Mercury 0.083 0.06 Ref. 5, p.30; Ref. 26, pp. 1-3, 70

Zinc 42.8 2.7 Ref. 5, p.30; Ref. 26, pp. 1-3, 69

SW-04

(SED-04-03-51)

Arsenic 1.10 0.6 Ref. 5, p.30; Ref. 26, pp. 1-3, 157

Chromium 2.50 1.2 Ref. 5, p.30; Ref. 26, pp. 1-3, 157

SW-04

(SED-04-03-51)

Manganese 32.3 0.6 Ref. 5, p.30; Ref. 26, pp. 1-3, 157

Vanadium 11.8 2.4 Ref. 5, p.30; Ref. 26, pp. 1-3, 157

SW-05

(SED-05-03-51)

Anthracene 0.00605 J 0.0055 Ref. 5, p.31; Ref. 26, pp. 431-433, 580

Benzo(a)anthracene 0.0286 J 0.0055 Ref. 5, p.31; Ref. 26, pp. 431-433, 580

Benzo(a)pyrene 0.0256 J 0.0055 Ref. 5, p.31; Ref. 26, pp. 431-433, 580

Benzo(k)fluoranthene 0.0329 J 0.0055 Ref. 5, p.31; Ref. 26, pp. 431-433, 580

Benzo(g,h,i)perylene 0.0145 J 0.0055 Ref. 5, p.31; Ref. 26, pp. 431-433, 580

Chrysene 0.0905 J 0.0055 Ref. 5, p.31; Ref. 26, pp. 431-433, 580

2-Methylnaphthalene 0.0128 J 0.0055 Ref. 5, p.31; Ref. 26, pp. 431-433, 580

Naphthalene 0.0153 J 0.0055 Ref. 5, p.31; Ref. 26, pp. 431-433, 580

Phenanthrene 0.0118 J 0.0055 Ref. 5, p.31; Ref. 26, pp. 431-433, 580

Pyrene 0.0761 J 0.0055 Ref. 5, p.31; Ref. 26, pp. 431-433, 580
SW Pathway – Likelihood of Release

HRS Documentation Record 40 MacMillan Ring Free Oil

ARD008049207

Station Location

(Sample ID)

Hazardous

Substance

Concentration

mg/kg

RL1

mg/kg Reference

Manganese 12.6 0.6 Ref. 5, p.30; Ref. 26, pp. 1-3, 165

DD-02

(DD-02-03-51)

Arsenic 4.5 1.1 Ref. 5, p. 19; Ref. 26, pp. 1-3, 33

Chromium 13.6 2.3 Ref. 5, p. 19; Ref. 26, pp. 1-3, 33

Manganese 90.0 1.1 Ref. 5, p. 19; Ref. 26, pp. 1-3, 33

Mercury 0.224 0.099 Ref. 5, p. 19; Ref. 26, pp. 1-3, 33

Vanadium 33.9 4.6 Ref. 5, p. 19; Ref. 26, pp. 1-3, 33

Zinc 100 4.6 Ref. 5, p. 19; Ref. 26, pp. 1-3, 33

2-Methylnaphthalene 0.014 J 0.0135 Ref. 5, p. 19; Ref. 26, pp. 431-433, 466

Benzo(a)anthracene 0.0312 J 0.0135 Ref. 5, p. 19; Ref. 26, pp. 431-433, 466

Benzo(a)pyrene 0.0357 J 0.0135 Ref. 5, p. 19; Ref. 26, pp. 431-433, 466

Benzo(g,h,i)perylene 0.0232 J 0.0135 Ref. 5, p. 19; Ref. 26, pp. 431-433, 466

Fluoranthene 0.0215 J 0.0135 Ref. 5, p. 19; Ref. 26, pp. 431-433, 466

Indeno(1,2,3-c,d)pyrene 0.0141 J 0.0135 Ref. 5, p. 19; Ref. 26, pp. 431-433, 466

Phenanthrene 0.0162 J 0.0135 Ref. 5, p. 19; Ref. 26, pp. 431-433, 466

DD-03

(DD-03-03-51)

Arsenic 2.8 1.5 Ref. 5, p. 19; Ref. 26, pp. 1-3, 41

Chromium 7.3 3.1 Ref. 5, p. 19; Ref. 26, pp. 1-3, 41

Manganese 121 1.5 Ref. 5, p. 19; Ref. 26, pp. 1-3, 41

Mercury 0.160 0.141 Ref. 5, p. 19; Ref. 26, pp. 1-3, 42

Vanadium 19.3 6.1 Ref. 5, p. 19; Ref. 26, pp. 1-3, 41

Zinc 148 6.1 Ref. 5, p. 19; Ref. 26, pp. 1-3, 41

Benzo(a)anthracene 0.0362 J 0.0348 Ref. 5, p. 19; Ref. 26, pp. 431-433, 473

Benzo(g,h,i)perylene 0.0430 J 0.0348 Ref. 5, p. 19; Ref. 26, pp. 431-433, 473

DD-04

(DD-04-03-51)

Chromium 1.7 1.2 Ref. 5, p. 19; Ref. 26, pp. 1-3, 49

Manganese 14.9 0.6 Ref. 5, p. 19; Ref. 26, pp. 1-3, 49

Mercury 0.076 0.058 Ref. 5, p. 19; Ref. 26, pp. 1-3, 50

Benzo(a)anthracene 0.0259 J 0.0135 Ref. 5, p. 19; Ref. 26, pp. 431-433, 480

Benzo(a)pyrene 0.0352 J 0.0135 Ref. 5, p. 19; Ref. 26, pp. 431-433, 480

Benzo(g,h,i)perylene 0.0456 J 0.0135 Ref. 5, p. 19; Ref. 26, pp. 431-433, 480

Fluoranthene 0.0386 J 0.0135 Ref. 5, p. 19; Ref. 26, pp. 431-433, 480

Phenanthrene 0.0391 J 0.0135 Ref. 5, p. 19; Ref. 26, pp. 431-433, 480

DD-04

(DD-04-03-52)

Arsenic 0.7 0.6 Ref. 5, p. 19; Ref. 26, pp. 1-3, 21

Chromium 2.2 1.2 Ref. 5, p. 19; Ref. 26, pp. 1-3, 21

Manganese 23.4 0.6 Ref. 5, p. 19; Ref. 26, pp. 1-3, 21

Zinc 48.6 2.4 Ref. 5, p. 19; Ref. 26, pp. 1-3, 21

Benzo(a)anthracene 0.0198 J 0.0056 Ref. 5, p. 19; Ref. 26, pp. 431-433, 453

Benzo(a)pyrene 0.0284 J 0.0056 Ref. 5, p. 19; Ref. 26, pp. 431-433, 453

Benzo(g,h,i)perylene 0.0343 J 0.0056 Ref. 5, p. 19; Ref. 26, pp. 431-433, 453

Fluoranthene 0.0124 J 0.0056 Ref. 5, p. 19; Ref. 26, pp. 431-433, 453

Indeno(1,2,3-cd)pyrene 0.0095 J 0.0056 Ref. 5, p. 19; Ref. 26, pp. 431-433, 453

2-Methylnaphthalene 0.0117 J 0.0056 Ref. 5, p. 19; Ref. 26, pp. 431-433, 453

Phenanthrene 0.0143 J 0.0056 Ref. 5, p. 19; Ref. 26, pp. 431-433, 453

Notes:

mg/kg = milligrams per kilogram = 1,000 micrograms per kilogram (μg/kg) 
SW Pathway – Likelihood of Release

HRS Documentation Record 41 MacMillan Ring Free Oil

ARD008049207

 1

 The Reporting Limit (RL) terminology used by the EPA Region 6 Laboratory are detection limits which have been adjusted for sample aliquot, 

sample volume, and dilutions for the analysis and meet the HRS definition of SQL (Ref. 1, Section 1.1, Table 2-3; Ref. 24, p. 4; Ref. 26, pp. 3, 311; 

Ref. 48, pp. 1-2).

J Identification of analyte is acceptable; the reported value is an estimate because the samples were extracted past holding time. Concentrations should 

be considered minimum values (Ref. 26, p. 432). The estimated values are biased low (Ref. 26, p. 432; Ref. 50, p. 1). 
SW Pathway – Likelihood of Release

HRS Documentation Record 42 MacMillan Ring Free Oil

ARD008049207

EPA SR Sampling Event – August 2012 

Sediment Samples – Wetland Contiguous to Hayes Creek 

Station Location

(Sample ID)

Hazardous

Substance

Concentration

mg/kg

RL1

mg/kg Reference

PPE-03

(PPE-03-03-51)

Benzo(a)anthracene 0.0229 J 0.0075 Ref. 5, p.29; Ref. 26, pp. 431-433, 542

Benzo(a)pyrene 0.022 J 0.0075 Ref. 5, p.29; Ref. 26, pp. 431-433, 542

Benzo(g,h,i)perylene 0.0141 J 0.0075 Ref. 5, p.29; Ref. 26, pp. 431-433, 542

Fluoranthene 0.016 J 0.0075 Ref. 5, p.29; Ref. 26, pp. 431-433, 542

Indeno(1,2,3-cd)pyrene 0.00991 J 0.0075 Ref. 5, p.29; Ref. 26, pp. 431-433, 542

2-Methylnaphthalene 0.00828 J 0.0075 Ref. 5, p.29; Ref. 26, pp. 431-433, 542

Phenanthrene 0.0214 J 0.0075 Ref. 5, p.29; Ref. 26, pp. 431-433, 542

Arsenic 1.6 0.6 Ref. 5, p.28; Ref. 26, pp. 1-3, 121

Chromium 4.2 1.1 Ref. 5, p.28; Ref. 26, pp. 1-3, 121

Manganese 36.2 0.6 Ref. 5, p.28; Ref. 26, pp. 1-3, 121

Mercury 0.087 0.054 Ref. 5, p.28; Ref. 26, pp. 1-3, 121

Vanadium 11.0 2.2 Ref. 5, p.28; Ref. 26, pp. 1-3, 121

WA-01

(WA-01-03-51)

Arsenic 1.3 0.5 Ref. 5, p.32; Ref. 26, pp.1-3, 137

Chromium 3.9 1.0 Ref. 5, p.32; Ref. 26, pp.1-3, 137

Manganese 47.9 15.6 Ref. 5, p.32; Ref. 26, pp.1-3, 137

Notes:

mg/kg = milligrams per kilogram = 1,000 micrograms per kilogram (μg/kg) 1

 The Reporting Limit (RL) terminology used by the EPA Region 6 Laboratory are detection limits which have been adjusted for sample aliquot, 

sample volume, and dilutions for the analysis and meet the HRS definition of SQL (Ref. 1, Section 1.1, Table 2-3; Ref. 24, p. 4; Ref. 26, pp. 3, 311; 

Ref. 48, pp. 1-2).

J For semivolatile compounds, identification of analyte is acceptable; the reported value is an estimate because the samples were extracted past holding 

time. Concentrations should be considered minimum values (Ref. 26, p. 432). The estimated values are biased low (Ref. 26, p. 432; Ref. 50, p. 1). For 

all other compounds, identification of analyte is acceptable; the reported value is an estimate due to outlying quality control parameters (Ref. 26, pp. 

3, 695).
SW Pathway – Likelihood of Release

HRS Documentation Record 43 MacMillan Ring Free Oil

ARD008049207

Attribution

 

Association with Sources 

Sources containing hazardous substances and releases of hazardous substances from these sources 

have been documented at this site, as discussed in Section 2.2 S ource Characterization and Section 

4.1.2.1.1 Observed Release of this HRS Documentation Record. Samples collected from overland 

drainage routes document hazardous substance migration from site sources to the surface water 

pathway (Ref. 25, pp. 1 6, 21, 22). T he following soil/sediment samples are included to support 

migration of site-related contamination along the overland flow segments from the sources to the 

probable points of entry to the contiguous wetland and Hayes Creek. 

Station Location

(CLP Sample No.) Sampling Location Sample Date (Military Time) Reference

EPA SR Sampling Event – August 2012

RD-02

(RD-02-03-51)

Field Duplicate

(RD-02-03-52)

At an active seep on the southern end of 

the railroad ditch located on east side of the 

rail spurs and west of the railroad tracks.

08/15/2012

(0905)

Ref. 25, p. 21; Ref. 30, p. 9; 

Attachment A, Figure A-5 

OP-01

(OP-01-03-51)

Outfall pipe located on east side of RD-01 

and the rail spurs. 

08/15/2012

(0855)

Ref. 25, p. 22; Ref. 30, p. 8; 

Attachment A, Figure A-5 

OP-02

(OP-02-03-51)

Outfall pipe located on west side of Ponds 

710-712 and wetland area.

08/15/2012

(1230) 

Ref. 25, p. 22; Ref. 30, p. 10; 

Attachment A, Figure A-5 

DD-05

(DD-05-03-51)

Field Duplicate

(DD-05-03-52)

Located where pipe from weir system 

enters the drainage ditch at southern end of 

Pond 712. 

08/16/2012

(0920)

Ref. 25, p. 12; Ref. 30, p. 12; 

Attachment A, Figure A-5 

Analytical results from soil/sediment samples collected from overland flow pathways are included to 

support migration of site-related contamination along the overland flow segment from site sources to 

the PPEs only. The analytical results from these samples were not used to score the site, but to support 

attribution.

Station Location

(CLP Sample 

No.)

Hazardous

Substance

Concentration2

mg/kg

RL1

mg/kg Reference

EPA SR Sampling Event – August 2012

RD-02

(RD-02-03-51)

Arsenic 1.5 0.5 Ref. 5, p.23; Ref. 26, pp. 1-3, 101

Chromium 3.8 1.0 Ref. 5, p.23; Ref. 26, pp. 1-3, 101

Manganese 23.6 0.5 Ref. 5, p.23; Ref. 26, pp. 1-3, 101

Mercury 0.186 0.054 Ref. 5, p. 23; Ref. 26, pp. 1-3, 102

2-Methylnaphthalene 0.0949 J 0.0516 Ref. 5, p. 23; Ref. 26, pp. 431-433, 522

Benzo(a)anthracene 0.383 J 0.0516 Ref. 5, p. 23; Ref. 26, pp. 431-433, 522

Benzo(a)pyrene 0.201 J 0.0516 Ref. 5, p. 23; Ref. 26, pp. 431-433, 522

Benzo(g,h,i)perylene 0.123 J 0.0516 Ref. 5, p. 24; Ref. 26, pp. 431-433, 522

Fluoranthene 0.0754 J 0.0516 Ref. 5, p. 24; Ref. 26, pp. 431-433, 522

Indeno(1,2,3-cd)pyrene 0.0646 J 0.0516 Ref. 5, p. 24; Ref. 26, pp. 431-433, 522
SW Pathway – Likelihood of Release

HRS Documentation Record 44 MacMillan Ring Free Oil

ARD008049207

Station Location

(CLP Sample 

No.)

Hazardous

Substance

Concentration2

mg/kg

RL1

mg/kg Reference

RD-02

(RD-02-03-52)

Arsenic 1.4 0.5 Ref. 5, p.23; Ref. 26, pp. 1-3, 105

Chromium 2.9 1.0 Ref. 5, p.23; Ref. 26, pp. 1-3, 105

Manganese 28.3 0.5 Ref. 5, p.23; Ref. 26, pp. 1-3, 105

Mercury 0.143 0.067 Ref. 5, p.23; Ref. 26, pp. 1-3, 106

2-Methylnaphthalene 0.244 J 0.0502 Ref. 5, p. 23; Ref. 26, pp. 431-433, 526

Benzo(a)anthracene 0.276 J 0.0502 Ref. 5, p. 23; Ref. 26, pp. 431-433, 526

Benzo(a)pyrene 0.117 J 0.0502 Ref. 5, p. 24; Ref. 26, pp. 431-433, 526

Benzo(g,h,i)perylene 0.102 J 0.0502 Ref. 5, p. 24; Ref. 26, pp. 431-433, 526

Indeno(1,2,3-cd)pyrene 0.0518 J 0.0502 Ref. 5, p. 24; Ref. 26, pp. 431-433, 526

OP-01

(OP-01-03-51)

Arsenic 1.9 0.6 Ref. 5, p. 21; Ref. 26, pp. 1-3, 93

Chromium 3.9 1.1 Ref. 5, p. 21; Ref. 26, pp. 1-3, 93

Manganese 34.4 0.6 Ref. 5, p. 21; Ref. 26, pp. 1-3, 93

Mercury 0.089 0.056 Ref. 5, p. 21; Ref. 26, pp. 1-3, 94

Benzo(a)anthracene 0.0194 J 0.0122 Ref. 5, p. 21; Ref. 26, pp. 431-433, 514

Benzo(a)pyrene 0.0261 J 0.0122 Ref. 5, p. 21; Ref. 26, pp. 431-433, 514

Benzo(g,h,i)perylene 0.0253 J 0.0122 Ref. 5, p. 22; Ref. 26, pp. 431-433, 514

Fluoranthene 0.0151 J 0.0122 Ref. 5, p. 22; Ref. 26, pp. 431-433, 514

Indeno(1,2,3-cd)pyrene 0.0148 J 0.0122 Ref. 5, p. 22; Ref. 26, pp. 431-433, 514

Phenanthrene 0.0242 J 0.0122 Ref. 5, p. 22; Ref. 26, pp. 431-433, 514

OP-02

(OP-02-03-51)

Arsenic 1.3 0.6 Ref. 5, p. 21; Ref. 26, pp. 1-3, 117

Chromium 3.0 1.2 Ref. 5, p. 21; Ref. 26, pp. 1-3, 117

Manganese 24.1 0.6 Ref. 5, p. 21; Ref. 26, pp. 1-3, 117

Mercury 0.078 0.065 Ref. 5, p. 21; Ref. 26, pp. 1-3, 118

Benzo(a)anthracene 0.412 J 0.027 Ref. 5, p. 21; Ref. 26, pp. 431-433, 538

Benzo(a)pyrene 0.135 J 0.027 Ref. 5, p. 21; Ref. 26, pp. 431-433, 538

Benzo(g,h,i)perylene 0.0751 J 0.027 Ref. 5, p. 22; Ref. 26, pp. 431-433, 538

Fluoranthene 0.289 J 0.027 Ref. 5, p. 22; Ref. 26, pp. 431-433, 538

Indeno(1,2,3-cd)pyrene 0.0315 J 0.027 Ref. 5, p. 22; Ref. 26, pp. 431-433, 538

Phenanthrene 0.0376 J 0.027 Ref. 5, p. 22; Ref. 26, pp. 431-433, 538

DD-05

(DD-05-03-51)

Arsenic 2.1 0.8 Ref. 5, p. 21; Ref. 26, pp. 1-3, 173

Chromium 7.2 1.6 Ref. 5, p. 21; Ref. 26, pp. 1-3, 173

Manganese 83.8 0.8 Ref. 5, p. 21; Ref. 26, pp. 1-3, 173

Mercury 0.170 0.094 Ref. 5, p. 21; Ref. 26, pp. 1-3, 174

Zinc 201 3.2 Ref. 5, p. 21; Ref. 26, pp. 1-3, 173

DD-05

(DD-05-03-52)

Arsenic 1.5 0.6 Ref. 5, p. 21; Ref. 26, pp. 1-3, 181

Chromium 5.6 1.2 Ref. 5, p. 21; Ref. 26, pp. 1-3, 181

Manganese 61.9 0.6 Ref. 5, p. 21; Ref. 26, pp. 1-3, 181

Mercury 0.078 0.071 Ref. 5, p. 21; Ref. 26, pp. 1-3, 182

Zinc 84.2 2.5 Ref. 5, p. 21; Ref. 26, pp. 1-3, 181

Benzo(a)pyrene 0.0184 J 0.0089 Ref. 5, p. 22; Ref. 26, pp. 431-433, 594

Benzo(g,h,i)perylene 0.0158 J 0.0089 Ref. 5, p. 22; Ref. 26, pp. 431-433, 594

2-Methylnaphthalene 0.0327 J 0.0089 Ref. 5, p. 22; Ref. 26, pp. 431-433, 594

Phenanthrene 0.0336 J 0.0089 Ref. 5, p. 22; Ref. 26, pp. 431-433, 594

Notes:
SW Pathway – Likelihood of Release

HRS Documentation Record 45 MacMillan Ring Free Oil

ARD008049207

mg/kg = milligrams per kilogram = 1,000 micrograms per kilogram (μg/kg) 1

 The Reporting Limit (RL) terminology used by the EPA Region 6 Laboratory are detection limits which have been adjusted for sample aliquot, 

sample volume, and dilutions for the analysis and meet the HRS definition of SQL (Ref. 1, Section 1.1, Table 2-3; Ref. 24, p. 4; Ref. 26, pp. 3, 311; 

Ref. 48, pp. 1-2).

J Identification of analyte is acceptable; the reported value is an estimate because the samples were extracted past holding time. Concentrations should 

be considered minimum values (Ref. 26, p. 432). The estimated values are biased low (Ref. 26, p. 432; Ref. 50, p. 1). 

The ground water plume under the property also shows migration of contamination from the property 

During sampling conducted in 2011 by ADEQ contractors, concentrations of benzene and naphthalene 

were detected (Ref. 6, pp. 97, 98). Ground water at the property is shallow at approximately 8 ft. bgs

(Ref. 6, p. 84). With the property at 50 feet above Hayes Creek, the ground water at the property is at 

a higher elevation than the adjacent surface water at Hayes Creek (Ref. 40, p. 1). 

Active seeps, which contain waste, are visible throughout the property. The waste follows the ground 

water gradient to the north-northeast toward Hayes Creek, south-southeast toward Massey Creek and 

south towards the convergence of the two creeks and emerges through the seeps, several of which are 

located adjacent to the railroad tracks. One such seep, RD-02, was sampled during the 2012 EPA SR. 

RD-02 contained arsenic, chromium, manganese, mercury, 2-methylnaphthalene, benzo(a)anthracene, 

benzo(a)pyrene, benzo(g,h,i)perylene, and indeno(1,2,3-cd)pyrene (Ref. 5, p p. 23, 24; Ref. 26, pp. 

105, 106, 526) . T he waste in the seeps is then carried through overland flow, discharging through 

piping located on the east side of the property. These pipes actively discharge waste into the wetland 

area (Ref. 6, pp. 12, 13, 43, 90, 123, 134, 140; Ref. 15, pp. 14, 15, 17- 22, 25,-31, 33-41; Ref. 22, pp. 

9, 12). Sample OP-02 was collected at an outfall pipe location just west of the wetland during the 

2012 EPA SR and contained arsenic, chromium, manganese, mercury, benzo(a)anthracene, 

benzo(a)pyrene, benzo(g,h,i)perylene, fluoranthene, indeno(1,2,3-cd)pyrene, and phenanthrene (Ref. 5, 

pp. 13, 21, 22; Ref. 22, p. 12; Ref. 26, p. 117, 118, 538; Ref. 30, pp. 3, 10; Ref. 39, pp. 1-2).

During the 2012 S R, two ground water samples were collected. O ne sample was designated as 

background and collected upgradient of the property, while the other (NCI-3) was collected on the east 

side of the property along the railroad spurs (Ref. 5, p. 4; Ref. 30, pp.24, 25). The following ground 

water sample is included to support migration of site-related contamination from the sources. 
SW Pathway – Likelihood of Release

HRS Documentation Record 46 MacMillan Ring Free Oil

ARD008049207

Station Location

(CLP Sample No.)

Hazardous

Substance

Concentration

mg/L

RL1

mg/L Reference

EPA SR Sampling Event – August 2012

NCI-3 

(NCI-3-120815-21)

Zinc 2.05 0.02 Ref. 5, p.38; Ref. 26, pp. 1-3, 

193

2-Methylnaphthalene 8.6 1.9 Ref. 5, p.83; Ref. 26, pp. 431-

433, 603

Naphthalene 19.6 1.9 Ref. 5, p.38; Ref. 26, pp. 431-

433, 603

Notes:

mg/L = milligram per liter for aqueous liquid = 1,000 microgram per liter (ug/L). 

1

 The Reporting Limit (RL) terminology used by the EPA Region 6 Laboratory are detection limits which have been adjusted for sample aliquot, 

sample volume, and dilutions for the analysis and meet the HRS definition of SQL (Ref. 1, Section 1.1, Table 2-3; Ref. 24, p. 4; Ref. 26, pp. 3, 311; 

Ref. 48, pp. 1-2).

Results of attribution soil/sediment and ground water samples revealed detects of several metals and 

PAHs as shown above. Of the metals and PAHs detected above in attribution soil/sediment samples, 

arsenic, chromium, manganese, vanadium, 2-methylnaphthalene, benzo(a)anthracene, benzo(a)pyrene, 

benzo(g,h,i)perylene, and indeno(1,2,3-cd)pyrene were also detected within Hayes Creek at 

concentrations meeting observed release criteria (Ref. 1, Table 2-3). Although low levels of PAHs are 

consistent with oil waste, these contaminants are also present within the CERCLA eligible wastes. In 

addition, elements such as chromium, hexavalent chromium, mercury, and zinc are present within the 

sources and these contaminants are not associated with OPA wastes, but with the RCRA hazardous 

K048 through K052 wastes (Ref. 31, pp. 12-16, 18-23, 25). 

The facility historically has had a mix of OPA and CERCLA-eligible wastes. It was discovered near 

the end of the OPA response, from state records and conversations with a former employee, that the 

impoundments (ponds) had been contaminated with the following listed RCRA hazardous wastes 

generated by petroleum refining operations: K048- DAF, K049 – slop oil emulsion solids, K050 – heat 

exchanger bundle cleaning sludge, K051- API separator sludge, and K052 – tank bottoms. T hese 

RCRA hazardous wastes also constitute CERCLA eligible wastes and have commingled with the 

contents of OPA regulated wastes (Ref. 43, p. 3). 

Historical operations at the facility have been demonstrated to cause, among others, arsenic, 

chromium, manganese, vanadium, 2-methylnaphthalene, benzo(a)anthracene, benzo(a)pyrene, 

benzo(g,h,i)perylene, and Indeno(1,2,3-cd)pyrene contamination based on sampling results of sources. 

The presence of these substances in sources at the site, combined with the overall lack of containment 

of the sources, and the fact that contaminated soil/sediment samples of overland flow pathways and 

ground water samples are present, support contamination migration of these same compounds from 

sources at the site into the surface water pathway. The contamination of, among others, arsenic, 

chromium, manganese, vanadium, 2-methylnaphthalene, benzo(a)anthracene, benzo(a)pyrene, 

benzo(g,h,i)perylene, and indeno(1,2,3-cd)pyrene in sediments can be attributed (wholly or, at least, in 

part) to the MacMillan operations. 

Consideration of Other Possible Off-Site Sources 

Searches of the Toxic Release Inventory (TRI) and EPA EnviroMapper for Envirofacts databases were 

performed within the zip code of the site location. Three facilities were identified upgradient along 

Hayes Creek (Ref. 33, pp. 1 -2). R olling Frito Lay Sales, Welsco Inc., and Cross Oil Refining and 

Marketing, Inc. Rolling Frito Lay is a local trucking facility; Welsco is an industrial gas facility; and 
SW Pathway – Likelihood of Release

HRS Documentation Record 47 MacMillan Ring Free Oil

ARD008049207

Cross Oil Refining and Marketing, Inc. is a petroleum refining facility (Ref. 33, pp. 3-20). No nearby 

facilities along the surface water pathway are reported to have had a release of arsenic, chromium, 

manganese, vanadium, 2-methylnaphthalene, benzo(a)anthracene, benzo(a)pyrene, 

benzo(g,h,i)perylene, and indeno(1,2,3-cd)pyrene according to the TRI database (Ref. 32, pp. 1-2).

Although MacMillan is located in an area with other petroleum and oil industries, the closest such, 

facility is Cross Oil Refining, located approximately 5-miles upstream along Hayes Creek (Ref. 33, p. 

1). The background sample collected for the site is deemed an appropriate background sample for the 

purposes of evaluating the site under the EPA’s HRS as the analytical results from the background 

sample is indicative of the highly petroleum industrialized area. Samples meeting observed release 

criteria, or displaying concentrations that are three times greater than the highest background 

concentration of a p articular analyte were collected at the site and from within the surface water 

pathway. Further, analytical results from samples collected from the sources at the site displayed the 

presence of the same contaminants as the samples collected from the surface water pathway meeting 

observed release criteria. 

Observed Release Factor

Based on the analytical data and attribution components listed above, arsenic, chromium, chromium 

(VI), lead, manganese, mercury, vanadium, zinc, anthracene, 2-methylnaphthalene, 

benzo(a)anthracene, benzo(a)pyrene, benzo(k)fluoranthene, benzo(g,h,i)perylene, chrysene, 

fluoranthene, dibenz(a,h)anthracene, indeno(1,2,3-cd)pyrene, naphthalene, phenanthrene, and pyrene

have been documented as the hazardous substances in the observed release to the wetland contiguous 

to Hayes Creek and Hayes Creek. Therefore, the observed release factor value of 550 was assigned 

(Ref. 1, Section 4.1.2.1.1). 

Observed Release Factor Value: 550
SW Pathway – Potential to Release

HRS Documentation Record 48 MacMillan Ring Free Oil

ARD008049207

4.1.2.1.2 POTENTIAL TO RELEASE

4.1.2.1.2.1 Potential to Release by Overland Flow

Potential to release was not evaluated because an observed release to the surface water pathway was 

established by direct observation and chemical analysis (see Section 4.1.2.1.1 of this HRS 

Documentation Record).
SW Pathway – Human Food Chain Threat/Waste Characteristics

HRS Documentation Record 49 MacMillan Ring Free Oil

ARD008049207

4.1.3 HUMAN FOOD CHAIN THREAT 

4.1.3.2 WASTE CHARACTERISTICS

Evidence of contamination associated with Source 1 a nd Source 2 have been established based on 

chemical analyses of samples collected from the sources (refer to the Attribution section and Section 

2.2). A rsenic, chromium, lead, manganese, mercury, vanadium, zinc, anthracene, 2-

methylnaphthalene, benzo(a)anthracene, benzo(a)pyrene, benzo(k)fluoranthene, benzo(g,h,i)perylene, 

chrysene, indeno(1,2,3-cd)pyrene, naphthalene, phenanthrene, and pyrene were detected in sediment 

samples collected in the surface water pathway, thus establishing an observed release (see Section 

4.1.2.1.1 of this HRS Documentation Record). 

4.1.3.2.1 Toxicity/Persistence/Bioaccumulation

Hazardous

Substance

Source 

Number

Toxicity 

Factor

Value

Persistence

Factor 

Value1

Food Chain

Bioaccumulation 

 Value

Fresh Water2

Toxicity/

Persistence/

Bioaccumulation 

Factor Value Reference

Arsenic 1,OR 10,000 1 5 5 x 104 Ref. 2, p. 6

Acenaphthylene 1,2 0 0.4 500 0 Ref. 2, p. 6

Anthracene 1,2,OR 10 0.4 50,000 2 x 105 Ref. 2, p. 6

Benzo(a)anthracene 1,2,OR 1,000 1 50,000 5 x 107 Ref. 2, p. 7

Benzo(a)pyrene 1,2,OR 10,000 1 50,000 5 x 108 Ref. 2, p. 7

Benzo(k)fluoranthene 1,OR 100 1 50,000 5 x 106 Ref. 2, p. 7

Benzo(g,h,i)perylene 1,OR 0 1 50,000 0 Ref. 2, p. 7

Chromium 1,2,OR 10,000 1 500 5 x 106 Ref. 2, p. 8

Chromium(IV) 1,OR 10,000 1 5 5 x 104 Ref. 2, p. 8

Chrysene 1,2,OR 10 1 5 5 x 101 Ref. 2, p. 8

Dibenz(a,h)anthracene 1 10,000 1 50,000 5 x 108 Ref. 2, p. 9

Indeno(1,2,3-cd)pyrene 1,OR 1,000 1 50,000 5 x 107 Ref. 2, p. 13 

Lead 1,2,OR 10,000 1 5 5 x 104 Ref. 2, p. 13

Manganese 1,OR 10,000 1 50,000 5 x 108 Ref. 2, p. 13 

Mercury 1, OR 10,000 0.4 50,000 2 x 108 Ref. 2, p. 13

2-Methylnaphthalene 1,2,OR 1,000 0.4 50,000 2 x 107 Ref. 2, p. 14 

Naphthalene 1,2, OR 1,000 0.4 50,000 2 x 107 Ref. 2, p. 14

Phenanthrene 1,2,OR 0 0.4 5,000 0 Ref. 2, p. 14

Pyrene 1,2, OR 100 1 50,000 5 x 106 Ref. 2, p. 15

Vanadium 1,2, OR 100 1 500 5 x 104 Ref. 2, p. 16 

Zinc 1, OR 10 1 5 5 x 101 Ref. 2, p. 17

Notes:

OR – Observed Release 1

 The surface water category that includes rivers, oceans, coastal tidal waters, and great lakes was utilized to assign the hazardous 

substances persistence factor value (Ref. 1, Sec. 4.1.2.2.1.2). The persistence values for rivers were assigned according to the 

Superfund Chemical Data Matrix (SCDM) Table (Ref. 2). 2 Bioaccumulation factor values are assigned from the SCDM (Ref. 2), for "Fresh Water" in which the fishery is located (Ref. 1, Sect. 

4.1.3.2.1.3). 
SW Pathway – Human Food Chain Threat/Waste Characteristics

HRS Documentation Record 50 MacMillan Ring Free Oil

ARD008049207

 

Toxicity/Persistence/Bioaccumulation Factor Value: 5 x 108

4.1.3.2.2 Hazardous Waste Quantity 

Source

No.

Source Hazardous 

Waste Quantity

Value

Containment Factor Value

Ground Water Surface Water Gas Air Particulate

1 6,253.846 NE 10 NE NE

2 14,896.923 NE 10 NE NE

TOTAL 21,150.769

 NE = Not Evaluated

A hazardous waste quantity of 21,150.769 is estimated for sources at the MacMillan site, which when 

applied in HRS Table 2-6, yields a pathway hazardous waste quantity of 10,000. 

Hazardous Waste Quantity Factor Value = 10,000 

4.1.4.2.3 Waste Characteristics Factor Category Value

Toxicity/Persistence Factor Value: 10,000 

Hazardous Waste Quantity Factor Value: 10,000 

Bioaccumulation Potential Factor Value: 50,000 

(Toxicity/Persistence Factor Value) x (Hazardous Waste Quantity Factor Value) = 1 x 108

 

(Toxicity/Persistence Factor Value x Hazardous Waste Quantity Factor Value) x 

(Bioaccumulation Potential Factor Value) = 5 x 1012 

(Ref. 1, Section 4.1.3.2.3). 

A hazardous waste quantity factor of 10,000 is assigned according to HRS Section 2.4.2.2. F rom 

Reference 2 and Table 4-12 of the HRS, benzo(a)pyrene and manganese have a toxicity/persistence 

value of 10,000 and a bioaccumulation potential factor of 50,000. T he waste characteristics factor 

category value from Reference 1, Table 2-7 for a waste characteristics product of 5 x 1012 is 1,000. 

Hazardous Waste Quantity Assigned Value: 10,000 

Waste Characteristics Factor Category Value: 1,000 
SW Pathway – Human Food Chain Threat/Targets

HRS Documentation Record 51 MacMillan Ring Free Oil

ARD008049207

4.1.3.3 TARGETS

4.1.3.3.1 Food Chain Individual

Fishing is documented within the TDL and occurs within Smackover Creek and the Ouachita River

(Ref. 36, p. 1). Fishermen along Smackover Creek and the Ouachita River catch bass, bream (sunfish), 

crappie, and catfish. These fish are used for personal consumption (Ref. 36, p. 1). 

Fishery Type of Surface Water Body Reference(s)

Smackover Creek Large River Ref. 37

Ouachita River Large River Ref. 38

An observed release by chemical analysis and an observed release by direct observation are established 

to the surface water migration pathway (See Section 4.1.2.1.1 of this HRS Documentation Record). 

Since this information documents an observed release of a hazardous substance having a 

bioaccumulation factor of 500 or greater to surface water (Hayes Creek) in the watershed and there is a 

fishery present within the TDL, a food chain individual value of 20 w as assigned (Ref. 1, S ection 

4.1.3.3.1; Ref. 36, p. 1).

Food Chain Individual Factor Value: 20 

4.1.3.3.2 Population 

4.1.3.3.2.1 Level I Concentrations

Level I concentrations have not been established as fish tissue samples have not been collected; 

therefore, the Level I concentrations factor value receives an assigned value of 0. 

Level I Concentration Factor Value: 0 

4.1.3.3.2.2 Level II Concentrations

Level II concentrations have not been established within the fishery; therefore, the Level II 

concentrations factor value receives an assigned value of 0. 

Level II Concentration Factor Value: 0 
SW Pathway – Human Food Chain Threat/Targets

HRS Documentation Record 52 MacMillan Ring Free Oil

ARD008049207

4.1.3.3.2.3 Potential Human Food Chain Contamination

Identity of 

Fishery

Annual 

Production 

(pounds)

Type of Surface 

Water Body

Average 

Annual 

Flow

Reference Population 

Value (Pi)

Dilution 

Weight (Di) Pi x Di

Smackover 

Creek

>0, but 

unknown

Large River 18,770 cfs Ref. 1, Tables 4-13, 

4-18; Ref. 37, p. 1

0.03 0.0001 0.000003

Ouachita River >0, but 

unknown

Large River 30,350 cfs Ref. 1, Tables 4-13, 

4-18; Ref. 38, p. 1

0.03 0.0001 0.000003

Notes:

cfs = cubic feet per second.

Smackover Creek and Ouachita River are fished for bass, bream (sunfish), crappie, and catfish 

according to the Arkansas Game and Fish Commission; these fish are caught for human consumption 

(Ref. 36). Data to estimate pounds of fish caught annually for Smackover Creek and Ouachita River

are not available; however, because these water bodies are fished, the annual production is known to 

be greater than zero. As such, a human food chain population value of 0.03 is assigned from Table 4-

18 of the HRS Rule (Ref. 1, T able 4-18). For Smackover Creek and Ouachita River, the dilution 

weight was based on the average annual flow data collected by the United States Geological Survey 

(USGS) at a gauging stations located upstream of the TDL (Ref. 37; Ref. 38). Based on the stream 

flow, Smackover Creek and Ouachita River, according to Table 4-13 of the HRS Rule, are classified as 

large rivers and receive an assigned dilution weight of 0.0001 (Ref. 1, Table 4-13). 

Smackover Creek and Ouachita River - Product of Pi x Di = 0.06 x 0.0001 

Product of Pi x Di: 0.000006 

(Sum of Products of Pi x Di)/10: 0.0000006
SW Pathway – Environmental Threat/Waste Characteristics

HRS Documentation Record 53 MacMillan Ring Free Oil

ARD008049207

4.1.4 ENVIRONMENTAL THREAT 

4.1.4.2 WASTE CHARACTERISTICS

Evidence of contamination associated with Sources 1 and 2 have been established based on chemical 

analyses of samples collected from these sources (refer to the Attribution Section and Section 2.2 of 

this HRS Documentation Record). Arsenic, chromium, chromium (VI) lead, manganese, mercury, 

vanadium, zinc, anthracene, 2-methylnaphthalene, benzo(a)anthracene, benzo(a)pyrene, 

benzo(k)fluoranthene, benzo(g,h,i)perylene, chrysene, indeno(1,2,3-cd)pyrene, naphthalene, 

phenanthrene, and pyrene were detected in sediment samples collected within the contiguous wetland

and Hayes Creek, establishing an observed release (see Section 4.1.2.1.1). 

4.1.4.2.1 Ecotoxicity/Persistence/Bioaccumulation

Hazardous

Substance

Source 

Number

Ecotoxicity 

Factor

Value

Fresh2

Persistence1

Factor 

Value

Ecosystem

Bioaccumulation 

Potential Factor 

Value

Fresh Water2

Ecotoxicity/

Persistence/

Bioaccumulation 

Factor Value Reference

Arsenic 1,OR 10 1 5,000 5 x 104 Ref. 2, p. 6

Anthracene 1,2,OR 10,000 0.4 50,000 2 x 108 Ref. 2, p. 6

Benzo(a)anthracene 1,2,OR 10,000 1 50,000 5 x 108 Ref. 2, p. 7

Benzo(a)pyrene 1,OR 10,000 1 50,000 5 x 108 Ref. 2, p. 7

Benzo(k)fluoranthene 1, R 0 1 50,000 0 Ref. 2, p. 7

Benzo(g,h,i)perylene 1,OR 0 1 50,000 0 Ref. 2, p. 7

Chromium 1,2,OR 10,000 1 500 5 x 106 Ref. 2, p. 8

Chromium(IV) 1,OR 100 1 5 5 x 102 Ref. 2, p. 8

Chrysene 1,2,OR 1,000 1 5,000 5 x 106 Ref. 2, p. 8

Dibenz(a,h)anthracene 1 0 1 50,000 0 Ref. 2, p. 9

Indeno(1,2,3-cd)pyrene 1,OR 0 1 50,000 0 Ref. 2, p. 13 

Lead 1,2,OR 1,000 1 50,000 5 x 107 Ref. 2, p. 13

Manganese 1,OR 0 1 50,000 0 Ref. 2, p. 13 

Mercury 1,OR 10,000 0.4 50,000 2 x 108 Ref. 2, p. 13

2-Methylnaphthalene 1,2,OR 100 0.4 50,000 2 x 106 Ref. 2, p. 14 

Naphthalene 1,2,OR 1,000 0.4 50,000 2 x 107 Ref. 2, p. 14

Phenanthrene 1,2,OR 10,000 0.4 50,000 2 x 108 Ref. 2, p. 14

Pyrene 1,2,OR 10,000 1 50,000 5 x 108 Ref. 2, p. 15

Vanadium 1,2,OR 0 1 500 0 Ref. 2, p. 16 

Zinc 1,OR 10 1 50,000 5 x 105 Ref. 2, p. 17

Notes:

OR – Observed Release 1

 The surface water category that includes rivers, oceans, coastal tidal waters, and great lakes was utilized to assign the hazardous 

substances persistence factor value (Ref. 1, Sec. 4.1.2.2.1.2). The persistence values for all the compounds listed were for rivers 
SW Pathway – Environmental Threat/Waste Characteristics

HRS Documentation Record 54 MacMillan Ring Free Oil

ARD008049207

which includes the contiguous wetland and Hayes Creek according to the Superfund Chemical Data Matrix (SCDM) table (Ref. 2). 2

 Bioaccumulation factor values are assigned from the SCDM (Ref. 2), for "Fresh Water" in which the wetland contiguous to Hayes 

Creek and sensitive environment are located (Ref. 1, Sect. 4.1.3.2.1.3). 

 

Ecotoxicity/Persistence/Bioaccumulation Factor Value: 5 x 108

4.1.4.2.2 Hazardous Waste Quantity 

Source

No.

Source Hazardous 

Waste Quantity

Value

Containment Factor Value

Ground Water Surface Water Gas Air Particulate

1 6,253.846 NE 10 NE NE

2 14,896.923 NE 10 NE NE

TOTAL 21,150.769

 NE = Not Evaluated

A hazardous waste quantity of 21,150.769 is estimated for sources at the MacMillan site, which when 

applied in HRS Table 2-6, yields a pathway hazardous waste quantity of 10,000. Also, as documented 

in Sections 4.1.2.1.1 and 4.1.4.3.1.2 of this HRS Documentation Record, a wetland is subject to Level 

II concentrations; therefore, a minimum value of 100 can be assigned for the hazardous waste quantity 

factor value (Ref. 1, Section 2.4.2.2). 

Hazardous Waste Quantity Factor Value = 10,000 

4.1.4.2.3 Waste Characteristics Factor Category Value

Ecotoxicity/Persistence Factor Value: 10,000

Hazardous Waste Quantity Factor Value: 10,000 

Bioaccumulation Potential Factor Value: 50,000 

(Ecotoxicity/Persistence Factor Value) x (Hazardous Waste Quantity Factor Value) = 1 x 108

 

(Ecotoxicity/Persistence Factor Value x Hazardous Waste Quantity Factor Value) x 

(Bioaccumulation Potential Factor Value) = 5 x 1012 

(Ref. 1, Section 4.1.3.2.3). 

A hazardous waste quantity factor of 10,000 is assigned according to HRS Section 2.4.2.2. F rom 

Reference 2 and Table 4-12 of the HRS, benzo(a)anthracene and benzo(a)pyrene have an 

ecotoxicity/persistence value of 10,000 and a bioaccumulation potential factor of 50,000. T he waste 

characteristics factor category value from Reference 1, Table 2-7 for a waste characteristics product of 

5 x 1012 is 1,000. 

Hazardous Waste Quantity Assigned Value: 10,000 

Waste Characteristics Factor Category Value: 1,000
SW Pathway – Environmental Threat/Targets

HRS Documentation Record 55 MacMillan Ring Free Oil

ARD008049207

4.1.4.3.1 SENSITIVE ENVIRONMENTS

4.1.4.3.1.1 Level I Concentrations

No Level I concentrations have been documented; therefore, Level I concentrations were not 

evaluated. Level I concentrations factor value receives an assigned value of 0. 

Level I Concentration Factor Value: 0 

4.1.4.3.1.2 Level II Concentrations

Wetlands

The area of Level II contamination includes the perimeter of the wetlands where observed release 

concentrations of contaminants were detected (Ref. 1, Section 4.1.2.1.1). The perimeter of the wetland

contiguous to Hayes Creek determined to be affected by Level II concentrations was approximately 

980 linear feet (Ref. 16, pp. 1 -13; Ref. 34, pp. 1-2). The total length of the wetland contiguous to 

Hayes Creek was determined in accordance with Sections 4.1.4.3.1.1 and 4.1.4.3.1.2 of the HRS (Ref. 

1) and was calculated by measuring the perimeter of the wetland contiguous to Hayes Creek subject to 

Level II concentrations as the length (Ref. 1, Sections 4.1.4.3.1.1 and 4.1.4.3.1.2; Ref. 24, pp. 1-2).

According to a wetlands evaluation conducted by an environmental scientist trained in wetland 

delineation, the area, which used to be a m an-made stormwater retention pond, e ast of the facility, 

meets the 40 CFR 230.3 definition of a wetland. A lthough the wetland evaluation was conducted 

under drought conditions, historically, this area has been inundated with water as observed during 

previous site visits and by historical aerial photographs, and indicators of wetland hydrology, soils and 

vegetation were noted in the evaluation (Ref. 15, pp. 38, 41; Ref. 16, pp. 1-13; Ref. 18, pp. 1).

Total Level II Wetland Perimeter = 980 feet (0.186 miles)

Wetland Value (Ref. 1, Table 4-24): 25 

Level II Concentrations Factor Value: 25 

4.1.4.3.1.3 Potential Contamination 

Sensitive Environments

Although wetland characteristics were not present between the farthest upstream PPE (DD-01) and 

farthest downstream sample (SW-05), this area is representative of a riparian habitat (Ref. 16, pp. 1-4). 

Riparian habitat and its diverse species represent an important component within ecosystem 

management. The majority of North American herpetofauna (reptiles and amphibians) inhabit wetland 
SW Pathway – Environmental Threat/Targets

HRS Documentation Record 56 MacMillan Ring Free Oil

ARD008049207

habitats, including riparian areas. Reptiles and amphibians are functionally tied to riparian habitats as 

they provide the essential habitat for their reproductive patterns (Ref. 35, pp. 1, 11). These particular

areas, relatively small in size, are important to the maintenance of unique biotic communities. This 

area of potential contamination within the TDL is considered a poor quality habitat due to industrial 

operations in the area. Therefore, this area is not included in the scoring of the site, but is presented

here to illustrate a potentially affected sensitive environment. 
SW Pathway – Ground Water to Surface Water Migration

HRS Documentation Record 57 MacMillan Ring Free Oil

ARD008049207

4.2 GROUND WATER TO SURFACE WATER MIGRATION COMPONENT- NOT SCORED

 

Section 4.2 of the HRS states that the ground water to surface water component can be used to 

evaluate surface water threats that result from migration of hazardous substances from a source at the 

facility to surface water (Ref. 1). Although the ground water to surface water component is possible 

as is evidence by the active seeps on the property, the surface water likelihood of release is scored 

based on the overland/flood migration component as shown in Section 4.1 of this report. Since the 

threat of release by overland flow or flood is more than minimal for this facility and the component 

score sufficient to score the overall site, the ground water to surface water migration component has 

not been scored. 
!(

SITE LOCATION

FIGURE A-1

FACILITY LOCATION MAP

MACMILLAN RING FREE OIL CO. INC.

600 MACMILLAN RD

NORPHLET, UNION COUNTY, ARKANSAS $

0 2,000 4,000

Feet

LEGEND

!( SITE LOCATION

20406.012.019.0718.01 AS SHOWN

TDD NO: TO-0019-12-03-01

CERCLIS NO: ARD008049207

SOURCE: ESRI StreetMap and Data Partners

FILE: L:\20406_START3_R6\NORPHLET_CHEMICAL\GIS\FIGURE_A-1_SITE_LOCATION_MAP-TOPO.mxd 9:59:49 AM 9/6/2013 bondp

SEPTEMBER, 2013

DATE PROJECT NO SCALE

US EPA REGION 6

")

Arkansas

REF. 3, P.1
Massey Creek

Hayes Creek

MacMillan

MacMillan

Holloway

E. Front St.

LEVEL II WETLAND AREA

SOURCE 1

SOURCE 2

Canning

Building

Drum

Storage

Norphlet

Wastewater

Treatment Ponds

Residence

Norphlet

Public

Schools

Ballpark

Boiler

Building

NCI

Plant

Fire

Water

Pond

712

711

710

705-707

704

FIGURE A-2

PROPERTY LAYOUT MAP

MACMILLAN RING FREE OIL CO. INC.

600 MACMILLAN RD

NORPHLET, UNION COUNTY, ARKANSAS $

0 550 1,100

Feet

LEGEND

FORMER PONDS

PROPERTY BOUNDARY

LEVEL II WETLAND AREA

20406.012.019.0718.01 AS SHOWN

TDD NO: TO-0019-12-03-01

CERCLIS NO: ARD008049207

SOURCE: (c) 2010 Microsoft Corporation and its data suppliers

FILE: L:\20406_START3_R6\NORPHLET_CHEMICAL\GIS\FIGURE_A-2_PROPERTY_LAYOUT_MAP.mxd 9:57:41 AM 9/6/2013 bondp

SEPTEMBER, 2013

DATE PROJECT NO SCALE

US EPA REGION 6

")

Arkansas

REF. 6, PP.33, 34

E Padgett Rd
!( !(

!(

!(

!(

!(

!(

!(

!(

!(

!(

")

")

")

!(

!(

!(

!(

")

")

!(

!(

!(

!(

!(

!(

!(

")

")

")

kj kj kj

AST's

MacMillan

E. Front St

E. Front St

SOURCE 2

SOURCE 1

Massey Creek

Hayes Creek

Massey Creek

BG-01

SW-04 SW-05

SW-03

SW-02

PPE-02

SW-01

PPE-01

DD-03

DD-04

WA-01

DD-01

(PPE1)

DD-02

(PPE2)

PPE-03(PPE3)

PPE4

PPE5

PPE6

RD-02

RD-01 OP-02

OP-01

DD-05

PS-01

PS-02

TS-02

TS-01

PS-03

NCI-1

NCI-3

MW-1

712

711

710

705-707

704

FIGURE A-3

SURFACE WATER PATHWAY MAP

MACMILLAN RING FREE OIL CO. INC.

600 MACMILLAN RD

NORPHLET, UNION COUNTY, ARKANSAS

$

0 320 640

Feet

TDD NO: TO-0019-12-03-01

CERCLIS NO: ARD008049207

SOURCE: (c) 2010 Microsoft Corporation and its data suppliers

LEGEND

SURFACE WATER FLOW DIRECTION

OVERLAND FLOW

kj OUTFALL PIPE

") BACKGROUND GROUNDWATER SAMPLE

!( BACKGROUND SEDIMENT SAMPLE

!( LEVEL II SEDIMENT SAMPLE

!( PROBABLE POINT OF ENTRY

!( SEDIMENT CHARACTERIZATION SAMPLE

") SOURCE CLASSIFICATION SAMPLE

LEVEL II WETLAND AREA

PROPERTY BOUNDARY

FORMER PONDS

20406.012.019.0718.01 AS SHOWN

1:19:42 PM 9/6/2013 FILE: L:\20406_START3_R6\NORPHLET_CHEMICAL\GIS\FIGURE_A-3_SURFACE WATER PATHWAY MAP.mxd 1:19:42 PM 9/6/2013 bondp

SEPTEMBER, 2013

DATE PROJECT NO SCALE

US EPA REGION 6

REF. 5, P. 10; REF. 6, PP. 30, 3
!(

!(

PPE6

DD-02 (PPE2)

Probable Point of Entry

Massey Creek

Hay es Cre ek 

1.07 miles

Flat Creek 

1. 8 6 miles

Ouachita River 

2.13 miles

Sma ckover C reek 

4.48 m iles

Haynes C reek 

5 .46 miles

FIGURE A-4

15-MILE TARGET DISTANCE LIMIT

MACMILLAN RING FREE OIL CO. INC.

600 MACMILLAN RD

NORPHLET, UNION COUNTY, ARKANSAS

$

0 0.5 1

Miles

TDD NO: TO-0019-12-03-01

CERCLIS NO: ARD008049207

SOURCE: © 2011 National Geographic Society, i-cubed

LEGEND

15-MILE TARGET DISTANCE LIMIT

!( UPSTREAM PROBABLE POINT OF ENTRY

PROPERTY BOUNDARY

20406.012.019.0718.01 AS SHOWN

10:21:11 AM 9/6/2013 FILE: L:\20406_START3_R6\NORPHLET_CHEMICAL\GIS\FIGURE_A-4_15-MILE TARGET DISTANCE LIMIT.mxd 10:21:11 AM 9/6/2013 bondp

SEPTEMBER, 2013

DATE PROJECT NO SCALE

US EPA REGION 6

15-mile TDL2

15-mileTDL1

REF. 3, PP. 1-3; REF. 6, PP. 30, 33
!( !(

!(

!(

!(!(

!(

!(

!(

!(

!(

")

")

")

!(

!(

!(

!(

")

")

!(

!(

!(

!(

")

")

")

Hayes Creek

SOURCE 2

SOURCE 1 PS-01

PS-02

PS-03

TS-02

TS-01

RD-02

RD-01

OP-02

OP-01

DD-05

DD-01 (PPE1)

DD-02 (PPE2)

PPE-03(PPE3)

SW-04 SW-05

SW-03

SW-02

PPE-02

SW-01

PPE-01

DD-03

DD-04

WA-01

BG-01

NCI-1

712

711

710

705-707

704

NCI-3

MW-1

FIGURE A-5

SAMPLE LOCATION MAP

MACMILLAN RING FREE OIL CO. INC.

600 MACMILLAN RD

NORPHLET, UNION COUNTY, ARKANSAS

$

0 250 500

Feet

TDD NO: TO-0019-12-03-01

CERCLIS NO: ARD008049207

SOURCE: (c) 2010 Microsoft Corporation and its data suppliers

LEGEND

") BACKGROUND GROUNDWATER SAMPLE

!( BACKGROUND SEDIMENT SAMPLE

!( LEVEL II SEDIMENT SAMPLE

!( PROBABLE POINT OF ENTRY

!( SEDIMENT CHARACTERIZATION SAMPLE

") SOURCE CLASSIFICATION SAMPLE

SURFACE WATER FLOW DIRECTION

LEVEL II WETLAND AREA

PROPERTY BOUNDARY

FORMER PONDS

20406.012.019.0718.01 AS SHOWN

5:50:25 PM 7/30/2013 FILE: L:\20406_START3_R6\NORPHLET_CHEMICAL\GIS\FIGURE_A-5_SAMPLE LOCATION MAP.mxd 5:50:25 PM 7/30/2013 bondp

JULY, 2013

DATE PROJECT NO SCALE

US EPA REGION 6

MacMillan

E. Front St

E. Front St

Holloway

REF. 5, P. 10; REF. 6, PP. 30, 34