HAZARD RANKING SYSTEM (HRS)

DOCUMENTATION RECORD - REVIEW COVER SHEET

Name of Site: Delta Shipyard

EPA ID No.: LAD058475419 

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 

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

although there is analytical data to support a release, there is not a sufficient number of targets 

to impact the overall site score. Based on information at this time, evaluation of the ground 

water migration pathway would not 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: 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 Delta Shipyard

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HRS Documentation Record 1 Delta Shipyard

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HRS DOCUMENTATION RECORD

Name of Site: Delta Shipyard

Site Spill Identifier No.: 06GC 

EPA ID No.: LAD058475419 

EPA Region: 6 

Date Prepared: May 2014 

Street Address of Site: 200 Dean Court* 

City, County, and State: Houma, Terrebonne Parish, Louisiana 70363* 

General Location

within the State: The site is located in the City of Houma, Terrebonne Parish, Louisiana. 

Houma is located in southern Louisiana (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: Houma, Louisiana (1998) (Ref. 

3, p. 1). 

Latitude/Longitude *: 29° 33’ 56.9448” N, 90° 42’ 18.507” W 

Latitude and Longitude coordinates were measured from the center of Pit 2 surface impoundment 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 96.106 

 HRS SITE SCORE 48.05

*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. EPA 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 certain area may need to be addressed under CERCLA. Accordingly, EPA 

contemplates that the preliminary description of facility 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 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 Map

• A-5 Sample Location Map

 
HRS Documentation Record 3 Delta Shipyard

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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 of the Hazard Ranking 

System 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). 2014. Superfund Chemical Data Matrix 

(SCDM) (excerpts). January 30, 2014. Pages: 21. [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. 1998. Houma, Louisiana; 1994, Dulac, 

Louisiana; 1998, Lake Quitman, Louisiana (7.5-minute topographic series maps). Pages: 3. 

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

and Longitude coordinates at Delta Shipyard. 19 March 2013. Pages: 2. 

5. EPA. 1981. Potential Hazardous Waste Site Identification and Preliminary Assessment. Delta 

Shipyard. Houma, Terrebonne Parish, Louisiana. LAO1317. April 1992. Pages: 7.

6. WESTON. 1996. Field Logbook. WO# 04603-026-031. Field Logbook Notes for Delta 

Shipyard Expanded Site Inspection. 07 March 1996 to 08 August 1996. Pages: 32. 

7. WESTON. 2012. Site Visit Photographs. Delta Shipyard, Houma, Louisiana. 10 January 

2012. Pages: 12.

8. Louisiana Department of Natural Resources (LDNR). 1983. Notice of Violation Letter. Delta 

Shipyard. 20 May 1983. Pages: 2. 

9. Wink Engineering. 1985. Letters to Louisiana State Department of Environmental Quality, 

Regarding Delta Shipyards’ Waste Sites at Houma and Duson, LA. 6 September 1985 and 5 

July 1985. Pages: 37.

10. Louisiana Department of Environmental Quality (LDEQ). 1986. General Inspection, Delta 

Shipyards, Houma, Terrebonne Parish. 16 April 1986. Pages: 3. 

11. EPA. 1994. Site Inspection Prioritization Report. Delta Shipyard, Phase III. Houma, 

Louisiana. December 1994. Pages: 57. 

 

12. EPA. 1996. Expanded Site Inspection Report (excerpts). Delta Shipyard, Houma, Louisiana. 

December 1996. Pages: 560. 

13. EPA. 2013. Trip Report for Delta Shipyard Reassessment. 200 Dean Court, Houma, 

Terrebonne Parish, Louisiana. 26 March 2013. Pages: 1152. 
14. US Fish and Wildlife Service. 2013. National Wetlands Inventory. Delta Shipyard Wetlands. 

Available at http://www.fws.gov/wetlands/Data/Mapper.html. Accessed on 26 March and 4 

April 2013. Pages: 14. 

15. Code of Federal Regulations. 2010. Code of Federal Regulations – Title 40: Protection of 

Environment. 230.3 – Definitions. Available at http://cfr.vlex.com/vid/230-3-definitions19816974. Updated 1 July 2010. Accessed on 28 June 2013. Pages: 5. 

16. WESTON. 2012. Quality Assurance Sampling Plan. Delta Shipyard, Houma, Terrebonne 

Parish, Louisiana. July 2012. Pages: 223. 

17. EPA. 1996. Fact Sheet. Using Qualified Data to Document an Observed Release and 

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

18. Federal Emergency Management Agency (FEMA). Flood Insurance Rate Map (FIRM).

Community Panel Number 225206 0265C. Terrebonne Parish, Louisiana. Map Revised 1 May 

1985. Pages: 1. 

19. WESTON. 2013. Project Note to File. Pit Area Measurements. Delta Shipyard, Houma, 

Terrebonne Parish, Louisiana. 31 July 2013. Pages: 2. 

20. WESTON. 2012. Photolog. Delta Shipyard, Houma, Louisiana. 7 June and 6-10 August 2012. 

Pages: 39.

21. USGS. 2008. Influence of the Houma Navigation Canal on Salinity Patterns and Landscape 

Configuration in Coastal Louisiana. 2008. Pages: 16. 

22. EPA. 2013. Envirofacts Warehouse. http://oaspub.epa.gov/enviro/enviroFACTS (updated 

http://www.epa.gov/enviro/index.html). With links to EPA Facility Registry System 

http://oaspub.epa.gov/enviro/ (updated 

http://www.epa.gov/enviro/html/fii/fii_query_java.html). Accessed 3 April 2013. Pages: 11. 

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

zip code 70360. Data Source: 2011 Data Updated as of March 2013. Pages: 2. 

24. WESTON. 2013. Project Note to File. Level II Wetland Perimeter Distance Measurement. 

Delta Shipyard, Houma, Terrebonne Parish, Louisiana. 1 August 2013. Pages: 3. 

25. WESTON. 2013. Project Note to File. Wetland Frontage Distance along TDL. Delta 

Shipyard, Houma, Terrebonne Parish, Louisiana. 5 April 2013. Pages: 2. 

26. USGS. 2013. Surface-Water Annual Statistics for Louisiana. USGS 07381328 Houma 

Navigation Canal at Dulac, Louisiana. 

http://waterdata.usgs.gov/la/nwis/annual/?search_site_no=07381328&agency_cd=USGS&refer

red_module=sw&format=sites_selection_links. Accessed 5 April 2013. Pages: 2. 

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27. WESTON. 1996. Phone Conversation Record with Louisiana Department of Wildlife and 

Fisheries. Fisheries in Houma Navigation Canal and Bayou LaCarpe. 14 March 1996. Pages: 

1. 

28. WESTON. 2013. Phone Conversation Record with Louisiana Department of Wildlife and 

Fisheries. Fisheries in Houma Navigation Canal and Bayou LaCarpe. 15 April 2013. Pages: 

1. 

29. WESTON. 2013. Project Note to File. Sample Quantitation Limit Calculation. Delta 

Shipyard, Terrebonne Parish, Louisiana. 29 July 2013. Pages: 2.

30. USGS Aerial Photographs 1978. 30 January 1962; May 1973; 4 February 1974; October 1978. 

Pages: 4. 

31. U.S. Department of Agriculture (USDA). 1960. Louisiana Online Soil Survey Manuscripts. 

Terrebonne Parish Detailed Soil Maps. 1960. 

http://soils.usda.gov/survey/online_surveys/louisiana/. Accessed 31 July 2013. Pages: 2.

 
HRS Documentation Record 6 Delta Shipyard

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SITE SUMMARY

The site being evaluated includes the release of hazardous substances from the waste filled open pits 

and an adjacent drainage ditch that resulted from the Delta Shipyard facility operations. The former 

Delta Shipyard (Site) is located at 200 Dean Court in southeastern Houma, Terrebonne Parish, 

Louisiana (Ref. 3, p. 1, Ref. 5, p. 1; Ref. 6, p. 10; Ref. 11, pp. 1, 2). The facility is located in a mixed

industrial/residential area south of the city of Houma, Louisiana and is depicted on Figure A-1 of 

Attachment A (Ref. 3, p. 1). The facility property once consisted of 165 acres and was home to 7 

divisions of Delta Ironworks, including Delta Shipyard (Ref. 5, p. 3). In 1973, Delta Ironworks 

merged with Chromalloy American Corporation of St. Louis, Missouri. Chromalloy maintained all 7 

of the divisions until November 1980, when 5 of the divisions were sold to Delta Services Industries of 

Houma, Louisiana, including Delta Shipyard (Ref. 5, p. 3). Mr. Lynn Dean (of Dean Boats, Inc.) 

purchased 110 acres of the industrial park from Delta Services in 1986 including the property owned 

by Delta Shipyard (Ref. 6, p. 3). 

Delta Shipyard consisted of a cleaning and repair facility for small cargo boats, fishing boats, and oil 

barges. Before repair work could begin, the boats had to be certified vapor free by the U.S. Coast 

Guard. To accomplish this, the boats were first steam cleaned to remove oily wastes. Recovered oil 

that was still deemed usable was recovered and sold. The remaining oily waste from the cleaning 

process was stored in several unlined earthen pits used as evaporation ponds (Ref. 5, p. 3). These pits 

were reportedly also used to dispose of oil-field drilling material (Ref. 9, p. 4). 

Currently, there are three open evaporation pits and a backfilled pit area located on-site. The three 

open pits are uncovered and lack containment features, which allow the contents to be exposed to the 

elements. The pits have no vegetation growing on them and have a crusty layer on the surface. Their 

surrounding berms are not maintained, contain heavy vegetation, and appear to be insufficient to 

contain the contents of the pits during a rain event. The crusty layer on the pits is black and appears to 

be a dried oil/petroleum-type waste (Ref. 7, pp. 1, 3, 5, 6). The backfilled pit area contains vegetation 

and trash and is differentiated from the surrounding land as mounds within a relatively flat topographic 

area. The closest residential property is located approximately 400 feet west of the open pits (Ref. 7, 

p. 7). A Property Layout Map is provided as Figure A-2. 

For the purpose of this HRS evaluation, the Delta Shipyard site includes the three open pits (Sources 1 

through 3) and an adjacent drainage ditch (Source 4). Sources 1 through 4 contain hazardous 

substances that are surrounded by HRS eligible wetlands. Hazardous substances associated with the 

sources could potentially be released into an adjacent waterway, Company Canal. Level II 

contamination, as a result of releases of hazardous substances via flooding and overland flow 

migration, has been documented in sediment within the surrounding wetland and Company Canal. 

This contamination threatens a nearby sensitive environment and fishery. 

History

Multiple phases of investigations have occurred at the Delta Shipyard Site since the early 1980s. 

Investigations that have been conducted in the vicinity of the open pits encompassing the current Site 

are described in the following paragraphs: 
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• 1981 – EPA contractors performed a primary assessment of the Site and found that 

contamination of surface water could occur if the pits overflowed, and they found some 

staining of soil from oily wastes in the pits (Ref. 5, p. 2).

• 1983 - The Louisiana Department of Natural Resources (LDNR) performed an inspection of 

the Site and subsequently issued a Notice of Violation (NOV). Eight violations were cited; 

among these violations were “that there was no indication that the facility was having their 

waste treated, stored, or disposed of at a permitted hazardous waste facility, and the facility has 

not developed and adhered to a ground water sampling and analysis plan” (Ref. 8, pp. 1,2). 

• 1985 - Wink Engineering collected one composite sludge sample from each of the three pits. A 

report prepared by Wink Engineering indicated that the contents of the pits were exposed. The 

samples were analyzed for volatiles, cyanide, total phenol, flash point, pH, toxicity, and oil and 

grease (Ref. 9, p. 5). Concentrations of chlorobenzene, ethylbenzene, toluene, and total 

xylenes were detected in the samples collected from the open pits (Ref. 9, p. 36). Wink 

Engineering concluded in the report that the Site did not pose a threat to human health or the 

environment since the constituents did not exceed limits specified in the Wink Engineering 

report (Ref. 9, p. 5). The nature of the specific limits were not defined in the Wink report (i.e., 

calculated background values, health-based screening levels, etc.).

• 1986 - The Louisiana Department of Environmental Quality (LDEQ), formerly LDNR, 

received a complaint about pits containing hazardous waste. A composite sample was 

collected from the three open pits and analyzed for volatiles, metals, and polychlorinated biphenyls (Ref. 10, pp. 1-4). Laboratory analytical information could not be found in the file 

information. 

• 1994 – EPA contractors conducted sampling at the pits in support of a Site Inspection 

Prioritization (SIP) Report. A limited number of pit sludge and drainage ditch sediment 

samples were collected in and around the pits (Ref. 11, pp. 6, 15). During field activities, water 

was observed flowing from an overflow pipe from Pit 2 into the nearby drainage ditch (Ref. 11, 

p. 7). The sludge samples collected from the exposed pits indicated the presence of volatiles, 

semivolatile organics, pesticides, and metals. Sediment analytical results meeting HRS 

observed release criteria of three times background included benzene, ethylbenzene, xylenes, 2-

methylnaphthalene, polycyclic aromatic hydrocarbons (PAHs), arsenic, chromium, lead, and 

mercury (Ref. 11, pp. 5, 16-51). 

• 1996 – EPA contractors conducted an Expanded Site Inspection (ESI) of Delta Shipyard. As 

part of the ESI, 7 pit sludge samples, 6 surface and subsurface soil samples, 2 ground water 

samples, 4 surface water samples, 37 stream sediment samples, and 6 field Quality Control 

samples were collected (Ref. 12, pp. 24, 32-37). The pit sludge sample results indicated 

elevated concentrations of 2-methylnaphthalene, naphthalene, phenanthrene, ethylbenzene, 

toluene, xylenes, chromium, lead, and zinc. Of these, the highest concentrations were the 

PAHs (Ref. 12, p. 40). In addition, samples collected from ground water, surface water, and 

soil indicated an elevated presence of PAHs, indicating migration of these contaminants from 

the pits to the surrounding media (Ref. 12, p. 57). 
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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 96.106 9,236.363 

(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

 ---- 9,236.363 

6. HRS Site Score: Divide the value on line 5 by 4 and take 48.05 

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.
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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 
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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 5x108 

16. Hazardous Waste Quantity a 100 

17. Waste Characteristics

(Toxicity/Persistence/Bioaccumulation x Hazardous Waste 

Quantity, then assign a value from Table 2-7) 1,000 320 

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 0.000003 

19d. Population (lines 19a + 19b + 19c) b 0.000003 

 

20. Targets (lines 18 + 19d) b 20.000003 

 

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 42.666

 

 
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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 100 

25. Waste Characteristics

(Ecosystem Tox./Persistence x Bioaccumulation x

Hazardous Waste Quantity, then assign a

value from Table 2-7) 1,000 320

Targets

26. Sensitive Environments

26a. Level I Concentrations b 0 

26b. Level II Concentrations b 25 

26c. Potential Contamination

26c. Potential Contamination b 0.05 

26d. Sensitive Environments (lines 26a + 26b + 26c) b 25.05 

27. Targets (value from line 26d) b 25.05

Environmental Threat Score

28. Environmental Threat Score

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

subject to a maximum of 60] 60 53.44

SURFACE WATER OVERLAND/FLOOD MIGRATION COMPONENT SCORE FOR A WATERSHED

29. Watershed Score 

[(Lines 13 + 21+ 28), 

subject to a maximum of 100] 100 96.106

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 96.106
Source Characterization – Source 1

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SOURCE DESCRIPTION

2.2 Source Characterization

Source Description: Source 1 – Open Pit 1

Source Type: Surface Impoundment

Source 1 consists of the northern most open pit (referred to as Pit 1) of three open pits located on the 

property and contains a total area of approximately 23,750 square feet (Attachment A, Figure A-2;

Ref. 13, p. 114; Ref. 19). Source 1 is classified as the HRS source type “Surface Impoundment” (Ref. 

1, Table 2-5). Oily waste from the cleaning process was stored in the unlined earthen pit used as an 

evaporation pond (Ref. 5, p. 3). The pit was reportedly also used to dispose of oil-field drilling 

material (Ref. 9, p. 4). Currently, the open pit is uncovered and lacks engineered containment features;

this allows the contents to be exposed to the elements. The pits have no vegetation growing on them 

and have a crusty layer on the surface. The crusty layer on the pit is black and appears to be a dried 

oil/petroleum-type waste (Ref. 7, pp. 1, 3, 5, 6; Ref. 12, pp. 16, 17). Although Pit 1 is separated from 

the other pits by a berm, the photo logs from the Site show that its surrounding berms are not 

maintained, contain heavy vegetation, and appear to be insufficient to contain the contents of the pit 

during a rain event (Ref. 7, pp. 1, 3, 5, 6; Ref. 20, pp. 16-18). 

Source Location

The open Pit 1 (Source 1) is the northern most open pit and is located on the south end of the property 

to the east of Dean Court (formerly referred to as Plant Shell Road) and west of Company Canal in a 

wetland area (Ref. 11, p. 3; Ref. 12, p. 23; Ref 14, p. 1). The location of the pit is depicted on 

Attachment A, Figure A-2.

Source Containment

Release To Surface Water

The open earthen Pit 1 is unlined and was originally surrounded by an earthen berm, but the berm is 

not maintained and as the photo logs from the Site show, over time the surrounding wetlands have 

encroached into Source 1 (Ref. 5, p. 3; Ref. 12, pp. 16, 17; Ref. 20, pp. 1-3, 6, 10-13, 17, 18).

The berm is absent in a low lying area in the northern section of Pit 1 (Source 1) at the apparent 

location of the beginning of the on-site drainage ditch (Ref. 12, p. 54). The berms are not maintained

and contain heavy vegetation (Ref. 7, pp. 1, 3, 4, 6, 9, 11; Ref. 12, pp. 96-99; Ref. 20, pp. 1-6, 10-13).

In addition, Source 1 is located in a special flood hazard area subject to inundation by the 1% annual 

chance of flood (Ref. 18, p. 1).
Source Characterization – Source 1

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Source 1 Overland Flow Containment

Value

Flood Containment

Value

Source 1 is surrounded by HRS

eligible surface water and source has 

unsound diking that is not regularly 

inspected or maintained (Ref. 7, pp. 1, 

3, 4, 6, 9, 11; Ref. 12, pp. 96-99; Ref. 

20, pp. 1-6, 10-13).

10 -

Source 1 has not been designed, 

constructed, operated, and maintained 

to prevent washout of hazardous 

substances by flooding (Ref. 7, pp. 1, 

3, 4, 6, 9, 11; Ref. 12, pp. 96-99; Ref. 

18, p. 1; Ref. 20, pp. 1-6, 10-13).

- 10 

2.4.1 Hazardous Substances

As part of the ESI sampling conducted by EPA contractors in July 1996, two waste samples were 

collected from Pit 1 (P01 and P02) (Attachment A, Figure A-5, Ref. 6, p. 15; Ref. 12, p. 36). The 

samples were analyzed for volatile organic analytes (VOAs), base-neutral, acids (BNA), and 

polychlorinated biphenyls (PCBs)/pesticides by Contract Laboratory Program (CLP) OLM01.9 and for 

target analyte list (TAL) metals and cyanide by CLP ILM04.0 by the CLP laboratories assigned by the 

EPA (Ref. 12, pp. 25, 131, 187). 

As part of reassessment sampling of the Delta Shipyard Site from 06 through 10 August 2012, EPA 

contractors collected six waste samples from various depths from Pit 1 (Attachment A, Figure A-5, 

Ref. 13, p. 126). The samples were analyzed for Target Compound List (TCL) volatile organic 

compounds (VOCs), TCL semivolatile organic compounds (SVOCs), pesticides, and PCBs by the 

CLP Statement of Work (SOW) for Multi-Media, Multi-Concentration Organic Analysis, SOM01.2, 

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

ISM01.3 (Ref. 13, p. 5). The samples were submitted to the EPA Region 6 Environmental Services 

Branch Laboratory, located in Houston, Texas (Ref. 13, p. 5). 

Analytical evidence of the contamination in waste source samples associated with Source 1 located on 

the Delta Shipyard Site is summarized below. 

Evidence

Hazardous

Substance

References Sample ID Concentration

(mg/kg) 

Quantitation 

Limit1

(mg/kg) 

ESI Sampling Activities – July 1996

Ethylbenzene

P01-71-1/ 

G42512

8.7 2.32 Ref. 6, p. 15; Ref.12, pp. 42, 227 

Xylenes 27.0 2.32 Ref. 6, p. 15; Ref.12, pp. 42, 227

2-Methylnaphalene 390 1202 Ref. 6, p. 15; Ref.12, pp. 42, 272

Naphthalene 130 1202 Ref. 6, p. 15; Ref.12, pp. 42, 272
Source Characterization – Source 1

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Hazardous

Substance

Evidence

References Sample ID Concentration

(mg/kg) 

Quantitation 

Limit1

(mg/kg) 

Endosulfan II 0.066 0.032 Ref. 6, p. 15; Ref.12, pp. 42, 300 

Heptachlor epoxide 0.110 0.032 Ref. 6, p. 15; Ref.12, pp. 42, 300

Arsenic 26.1 1.193 Ref. 6, p. 15; Ref.12, pp. 42, 126, 406 

Cadmium 5.6 0.553 Ref. 6, p. 15; Ref.12, pp. 42, 126 

Chromium 709 1.093 Ref. 6, p. 15; Ref.12, pp. 42, 126 

Lead 861 0.0553 Ref. 6, p. 15; Ref.12, pp. 42, 126

Mercury 1.8 0.0553 Ref. 6, p. 15; Ref.12, pp. 42, 126

Zinc 1,010 2.193 Ref. 6, p. 15; Ref.12, pp. 42, 126

Ethylbenzene

P02-71-1/

G42513

3.5 2.12 Ref. 6, p. 14; Ref.12, pp. 42, 229 

Xylenes 23 2.12 Ref. 6, p. 14; Ref.12, pp. 42, 229

2-Methylnaphalene 460 1102 Ref. 6, p. 14; Ref.12, pp. 42, 275 

Naphthalene 160 1102 Ref. 6, p. 14; Ref.12, pp. 42, 275 

Endosulfan II 0.088 0.0272 Ref. 6, p. 14; Ref.12, pp. 42, 301

Heptachlor epoxide 0.049 0.0272 Ref. 6, p. 14; Ref.12, pp. 42, 301

Arsenic 32.7 1.193 Ref. 6, p. 14; Ref.12, pp. 42, 127

Cadmium 6.5 0.593 Ref. 6, p. 14; Ref.12, pp. 42, 127

Chromium 576 1.193 Ref. 6, p. 14; Ref.12, pp. 42, 127

Lead 952 0.593 Ref. 6, p. 14; Ref.12, pp. 42, 127

Mercury 1.6 0.0593 Ref. 6, p. 14; Ref.12, pp. 42, 127

Zinc 1,140 2.383 Ref. 6, p. 14; Ref.12, pp. 42, 127 

Reassessment Sampling Activities – August 2012

Ethylbenzene

DSE-01-24-413

0.858 0.09994 Ref. 13, pp. 91, 126, 132-135, 207, 374

Isopropylbenzene 0.456 0.09994 Ref. 13, pp. 91, 126, 132-135, 207, 374

meta-/para-Xylene 3.9 0.204 Ref. 13, pp. 91, 126, 132-135, 207, 374

ortho-Xylene 2.1 0.09994 Ref. 13, pp. 91, 126, 132-135, 207, 374

Toluene 0.641 0.09994 Ref. 13, pp. 91, 126, 132-135, 207, 374

Anthracene 1.8 1.144 Ref. 13, pp. 91, 126, 132-135, 208, 374

Fluorene 8.55 J 1.144 Ref. 13, pp. 91, 126, 132-135, 209, 374

2-Methylnaphthalene 50.7 J 1.144 Ref. 13, pp. 91, 126, 132-135, 209, 374

Naphthalene 18.3 1.144 Ref. 13, pp. 91, 126, 132-135, 209, 374

Phenanthrene 11.9 1.144 Ref. 13, pp. 91, 126, 132-135, 210, 374

Pyrene 1.66 1.144 Ref. 13, pp. 91, 126, 132-135, 210, 374

Antimony 4.8J 1.34 Ref. 13, pp. 90, 126, 132-135, 212, 374

Arsenic 28.6 1.34 Ref. 13, pp. 90, 126, 132-135, 212, 374

Cadmium 5.8 0.74 Ref. 13, pp. 90, 126, 132-135, 212, 374

Chromium 327 1.34 Ref. 13, pp. 90, 126, 132-135, 212, 374

Lead 803 1.34 Ref. 13, pp. 90, 126, 132-135, 212, 374
Source Characterization – Source 1

HRS Documentation Record 15 Delta Shipyard

LAD058475419

Hazardous

Substance

Evidence

References Sample ID Concentration

(mg/kg) 

Quantitation 

Limit1

(mg/kg) 

Manganese 569 0.74 Ref. 13, pp. 90, 126, 132-135, 212, 374

Mercury 1.8 0.0774 Ref. 13, pp. 90, 126, 132-135, 213, 374

Benzene

DSE-01-48-413

0.86 0.0994 Ref. 13, pp. 91, 126, 132-135, 214, 374

Ethylbenzene 6.04 0.09994 Ref. 13, pp. 91, 126, 132-135, 215, 374

Isopropylbenzene 2.36 0.09994 Ref. 13, pp. 91, 126, 132-135, 215, 374

meta-/para-Xylene 20.3 0.404 Ref. 13, pp. 91, 126, 132-135, 215, 374

ortho-Xylene 9.94 0.204 Ref. 13, pp. 91, 126, 132-135, 215, 374

Toluene 5.94 0.09994 Ref. 13, pp. 91, 126, 132-135, 215, 374

Fluorene 38.3 13.14 Ref. 13, pp. 91, 126, 132-135, 217, 374

2-Methylnaphthalene 593 13.14 Ref. 13, pp. 91, 126, 132-135, 217, 374

Naphthalene 184 13.14 Ref. 13, pp. 91, 126, 132-135, 217, 374

Phenanthrene 89.2 13.14 Ref. 13, pp. 91, 126, 132-135, 218, 374

Pyrene 3.41 1.314 Ref. 13, pp. 91, 126, 132-135, 218, 374

Antimony 6.5 1.34 Ref. 13, pp. 90, 126, 132-135, 220, 374

Arsenic 26.9 1.34 Ref. 13, pp. 90, 126, 132-135, 220, 374

Cadmium 6 0.74 Ref. 13, pp. 90, 126, 132-135, 220, 374

Chromium 296 1.34 Ref. 13, pp. 90, 126, 132-135, 220, 374

Lead 733 1.34 Ref. 13, pp. 90, 126, 132-135, 220, 374

Manganese 501 0.74 Ref. 13, pp. 90, 126, 132-135, 220, 374

Mercury 2.07 0.1564 Ref. 13, pp. 90, 126, 132-135, 221, 374

Benzene

DSE-01-72-413

0.584 0.104 Ref. 13, pp. 93, 126, 132-135, 222, 374

Ethylbenzene 3.97 0.104 Ref. 13, pp. 93, 126, 132-135, 223, 374

Isopropylbenzene 1.55 0.104 Ref. 13, pp. 93, 126, 132-135, 223, 374

meta-/para-Xylene 16.5 0.104 Ref. 13, pp. 93, 126, 132-135, 223, 374

ortho-Xylene 8.2 0.104 Ref. 13, pp. 93, 126, 132-135, 223, 374

Toluene 3.85 0.104 Ref. 13, pp. 93, 126, 132-135, 223, 374

Dibenzofuran 17.5 13.54 Ref. 13, pp. 93, 126, 132-135, 225, 374

2-Methylnaphthalene 523 13.54 Ref. 13, pp. 93, 126, 132-135, 225, 374

Fluorene 30.3 13.54 Ref. 13, pp. 93, 126, 132-135, 225, 374

Naphthalene 164 13.54 Ref. 13, pp. 93, 126, 132-135, 225, 374

Phenanthrene 77.7 13.54 Ref. 13, pp. 93, 126, 132-135, 226, 374

Pyrene 3.21 1.354 Ref. 13, pp. 93, 126, 132-135, 226, 374

Antimony 3.1 1.34 Ref. 13, pp. 92, 126, 132-135, 228, 374

Arsenic 40.9 1.34 Ref. 13, pp. 92, 126, 132-135, 228, 374

Cadmium 2.4 0.74 Ref. 13, pp. 92, 126, 132-135, 228, 374

Chromium 137 1.34 Ref. 13, pp. 92, 126, 132-135, 228, 374

Lead 405 1.34 Ref. 13, pp. 92, 126, 132-135, 228, 374
Source Characterization – Source 1

HRS Documentation Record 16 Delta Shipyard

LAD058475419

Hazardous

Substance

Evidence

References Sample ID Concentration

(mg/kg) 

Quantitation 

Limit1

(mg/kg) 

Manganese 355 0.74 Ref. 13, pp. 92, 126, 132-135, 228, 374

Mercury 1.82 0.0784 Ref. 13, pp. 92, 126, 132-135, 229, 374

Benzene

DSE-01-96-413

0.146 0.104 Ref.13, pp. 93, 126, 132-135, 230, 373

Ethylbenzene 1.48 0.104 Ref.13, pp. 93, 126, 132-135, 231, 373

Isopropylbenzene 0.78 0.104 Ref.13, pp. 93, 126, 132-135, 231, 373

meta-/para-Xylene 6.24 0.104 Ref.13, pp. 93, 126, 132-135, 231, 373

ortho-Xylene 2.59 0.104 Ref.13, pp. 93, 126, 132-135, 231, 373

Toluene 0.828 0.104 Ref.13, pp. 93, 126, 132-135, 231, 373

2-Methylnaphthalene 310 13.14 Ref.13, pp. 93, 126, 132-135, 233, 373

Naphthalene 86.1 13.14 Ref.13, pp. 93, 126, 132-135, 233, 373

Phenanthrene 43.7 13.14 Ref.13, pp. 93, 126, 132-135, 234, 373

Antimony 5.8 1.34 Ref. 13, pp. 92, 126, 132-135, 236, 373

Arsenic 63.5 1.34 Ref. 13, pp. 92, 126, 132-135, 236, 373

Cadmium 3.8 0.74 Ref. 13, pp. 92, 126, 132-135, 236, 373

Chromium 73.2 1.34 Ref. 13, pp. 92, 126, 132-135, 236, 373

Lead 541 1.34 Ref. 13, pp. 92, 126, 132-135, 236, 373

Manganese 489 0.74 Ref. 13, pp. 92, 126, 132-135, 236, 373

Mercury 1.75 0.0824 Ref. 13, pp. 92, 126, 132-135, 237, 373

Ethylbenzene

DSE-01-120-

413

0.492 0.104 Ref. 13, pp. 91, 126, 132-135, 191, 373

Isopropylbenzene 0.324 0.104 Ref. 13, pp. 91, 126, 132-135, 191, 373

meta-/para-Xylene 2.1 0.204 Ref. 13, pp. 91, 126, 132-135, 191, 373

ortho-Xylene 0.977 0.104 Ref. 13, pp. 91, 126, 132-135, 191, 373

Toluene 0.349 0.104 Ref. 13, pp. 91, 126, 132-135, 191, 373

2-Methylnaphthalene 213 14.44 Ref. 13, pp. 91, 126, 132-135, 193, 373

Fluorene 14.9 14.44 Ref. 13, pp. 91, 126, 132-135, 193, 373

Naphthalene 44.2 1.444 Ref. 13, pp. 91, 126, 132-135, 193, 373

Phenanthrene 33.4 33.44 Ref. 13, pp. 91, 126, 132-135, 194, 373

Pyrene 1.55 1.444 Ref. 13, pp. 91, 126, 132-135, 194, 373

Antimony 1.9 1.44 Ref. 13, pp. 90, 126, 132-135, 196, 373

Arsenic 26.3 1.44 Ref. 13, pp. 90, 126, 132-135, 196, 373

Cadmium 1.5 0.74 Ref. 13, pp. 90, 126, 132-135, 196, 373

Chromium 96.2 1.44 Ref. 13, pp. 90, 126, 132-135, 196, 373

Lead 310 1.44 Ref. 13, pp. 90, 126, 132-135, 196, 373

Manganese 465 0.74 Ref. 13, pp. 90, 126, 132-135, 196, 373

Mercury 0.609 0.0814 Ref. 13, pp. 90, 126, 132-135, 197, 373

Phenanthrene DSE-01-144-

413

1.97 0.3304 Ref. 13, pp. 91, 126, 132-135, 202, 373

Antimony 1.8 1.54 Ref. 13, pp. 90, 126, 132-135, 204, 373
Source Characterization – Source 1

HRS Documentation Record 17 Delta Shipyard

LAD058475419

Hazardous

Substance

Evidence

References Sample ID Concentration

(mg/kg)

Quantitation 

Limit1

(mg/kg)

Arsenic 37.3 1.54 Ref. 13, pp. 90, 126, 132-135, 204, 373

Chromium 17.3 0.84 Ref. 13, pp. 90, 126, 132-135, 204, 373

Lead 131 1.24 Ref. 13, pp. 90, 126, 132-135, 204, 373

Manganese 358 0.84 Ref. 13, pp. 90, 126, 132-135, 204, 373

Mercury 0.142 0.1044 Ref. 13, pp. 90, 126, 132-135, 205, 373

Notes:

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

J The identification of the analyte is acceptable; the reported value is an estimate (Ref. 12, p. 193; Ref. 13, p. 380). There is an unknown bias associated 

with these concentrations. 1 The Reporting Limit (RL) terminology used by the EPA Region 6 Laboratory and the Adjusted Contract Required Quantitation Limit (CRQL) and 

Contract Required Detection Limit (CRDL) terminology used by the CLP Laboratory are based on detection limits that have been adjusted for sample 

aliquot, sample volume, and dilutions for the analysis Ref. 1, Section 1.1, Table 2-3; Ref. 13, pp. 134-135; Ref. 29). 2 Quantitation limit provided is an adjusted CRQL (Ref. 12, pp. 400-405; Ref. 29). 3

 Quantitation limit provided is an adjusted CRDL (Ref. 12, p. 406; Ref. 29). 4

 Quantitation limit provided is an RL (Ref. 13, p. 135; Ref. 29).

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, 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 1 with reasonable confidence.

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, Section 2.4.2.1.2). There 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 with reasonable confidence. Scoring proceeds to the evaluation of Tier C, 

volume (Ref. 1, Section 2.4.2.1.3).
Source Characterization – Source 1

HRS Documentation Record 18 Delta Shipyard

LAD058475419

2.4.2.1.3 Tier C: Volume

The information available is not sufficient to adequately determine a volume with reasonable 

confidence for Source 1. There are insufficient historical and current data available to adequately 

calculate the depth of the pits and, therefore, determine the volume of Source 1. Source 1 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). 

 Volume Assigned Value: 0 

2.4.2.1.4 Tier D: Area

The area of Pit 1 (Source 1) was determined by measurements obtained by using Geographic 

Information System (GIS) software (Ref. 19). GIS software contains recent aerial photography of the 

Site, which allows the user to trace an area and determine length and width measurements of the pits 

(Ref. 19). The area of Source 1 was calculated to total 23,750 square feet (Attachment A, Figure A-2; 

Ref. 19). The Tier C equation for assigning a value for area of a source type “Surface Impoundment” is 

A/13 (Ref. 1, Table 2-5). Calculations for Pit 1 are as follows:

Pit 1: 190 feet x125 feet = 23,750 square feet

Area of Source 1 (square feet): 23,750 

Area Assigned Value = 23,750/13 

Area Assigned Value = 1,826.923 

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 1,826.923

Source Hazardous Waste Quantity Value: 1,826.923
Source Characterization – Source 2

HRS Documentation Record 19 Delta Shipyard

LAD058475419

SOURCE DESCRIPTION

2.2 Source Characterization

Source Description: Source 2 – Open Pit 2

Source Type: Surface Impoundment

Source 2 consists of the middle open pit (referred to as Pit 2) of three open pits located on the property 

and contains a total area of approximately 26,875 square feet (Attachment A, Figure A-2; Ref. 13, p. 

112; Ref. 19). Source 2 is classified as the HRS source type “Surface Impoundment” (Ref. 1, Table 2-

5). Oily waste from the cleaning process was stored in the unlined earthen pit used as an evaporation 

pond (Ref. 5, p. 3). Currently, the open pit is uncovered and lacks engineered containment features; 

this allows the contents to be exposed to the elements. The pit has no vegetation growing on it and has

a crusty layer on the surface. The crusty layer on the pit is black and appears to be a dried 

oil/petroleum-type waste (Ref. 7, pp. 1, 3, 5, 6; Ref. 12, pp. 16, 17). Although Pit 2 is separated from 

the other pits by a berm, the photo logs from the Site show that its surrounding berms are not 

maintained, contain heavy vegetation, and appear to be insufficient to contain the contents of the pit 

during a rain event (Ref. 7, pp. 1, 3, 5, 6; Ref. 20, pp. 16-18). 

Source Location

The open Pit 2 (Source 2) is the middle open pit and is located on the south end of the property to the 

east of Dean Court (formerly referred to as Plant Shell Road) and west of Company Canal in a wetland 

area (Ref. 11, p. 3; Ref. 12, p. 23; Ref 14, p. 1). The location of the pit is depicted on Attachment A, 

Figure A-2.

Source Containment

Release To Surface Water

The open earthen Pit 2 is unlined and was originally surrounded by an earthen berm, but the berm is 

not maintained and as photo logs from the Site show, over time the surrounding wetlands have 

encroached into Source 2 (Ref. 5, p. 3; Ref. 12, pp. 16, 17; Ref. 20, pp. 1-3, 6, 10-13, 17, 18).

The berms are not maintained and contain heavy vegetation (Ref. 7, pp. 1, 3, 4, 6, 9, 11; Ref. 12, pp. 

96-99; Ref. 20, pp. 1-6, 10-13). In addition, Source 2 is located in a special flood hazard area subject to 

inundation by the 1% annual chance of flood (Ref. 18, p. 1).
Source Characterization – Source 2

HRS Documentation Record 20 Delta Shipyard

LAD058475419

Source 2 Overland Flow Containment

Value

Flood Containment

Value

Source 2 is surrounded by HRS 

eligible surface water and source has 

unsound diking that is not regularly 

inspected or maintained (Ref. 7, pp. 1, 

3, 4, 6, 9, 11; Ref. 12, pp. 96-99; Ref. 

20, pp. 1-6, 10-13).

10 -

Source 2 has not been designed, 

constructed, operated, and maintained 

to prevent washout of hazardous 

substances by flooding (Ref. 7, pp. 1, 

3, 4, 6, 9, 11; Ref. 12, pp. 96-99; Ref. 

18, p. 1; Ref. 20, pp. 1-6, 10-13).

- 10 

2.4.1 Hazardous Substances

As part of the ESI sampling conducted by EPA contractors in July 1996, two waste samples were 

collected from the Pit 2 (P03 and P04) (Attachment A, Figure A-5, Ref. 6, p. 14; Ref. 12, p. 36). The 

samples were analyzed for volatile organic analytes (VOAs), base-neutral, acids (BNA), and 

polychlorinated biphenyls (PCBs)/pesticides by Contract Laboratory Program (CLP) OLM01.9 and for 

target analyte list (TAL) metals and cyanide by CLP ILM04.0 by the CLP laboratories assigned by the 

EPA (Ref. 12, pp. 25, 131, 187). 

As part of reassessment sampling of the Delta Shipyard Site from 06 through 10 August 2012, EPA 

contractors collected six waste samples from various depths from Pit 2 (Attachment A, Figure A-5, 

Ref. 13, p. 125). The samples were analyzed for TCL VOCs, TCL SVOCs, pesticides, and PCBs by 

the CLP SOW for Multi-Media, Multi-Concentration Organic Analysis, SOM01.2, and TAL metals 

with mercury by CLP SOW Multi-Media, Multi-Concentration Inorganics Analysis, ISM01.3 (Ref. 13, 

p. 5). The samples were submitted to the EPA Region 6 Environmental Services Branch Laboratory, 

located in Houston, Texas (Ref. 13, p. 5). 

Analytical evidence of the contamination in waste source samples associated with Source 2 located on 

the Delta Shipyard Site is summarized below. 

Evidence

Hazardous

Substance

References Sample ID Concentration

(mg/kg)

Quantitation 

Limit1

(mg/kg)

ESI Sampling Activities – July 1996 

Ethylbenzene 4.5 2.12 Ref. 6, p. 14; Ref.12, pp. 42, 225 

Toluene 3.8 2.12 Ref. 6, p. 14; Ref.12, pp. 42, 225

Xylenes P03-71-1/ 28.0 2.12 Ref. 6, p. 14; Ref.12, pp. 42, 225

2-Methylnaphalene G42511 470 1102 Ref. 6, p. 14; Ref.12, pp. 42, 269

Naphthalene 160 1102 Ref. 6, p. 14; Ref.12, pp. 42, 269

Phenanthrene 110 J 1102 Ref. 6, p. 14; Ref.12, pp. 42, 269
Source Characterization – Source 2

HRS Documentation Record 21 Delta Shipyard

LAD058475419

Hazardous

Substance

Evidence

References Sample ID Concentration

(mg/kg)

Quantitation 

Limit1

(mg/kg)

Endosulfan II 0.089 0.0282 Ref. 6, p. 14; Ref.12, pp. 42, 299

Heptachlor epoxide 0.089 0.0282 Ref. 6, p. 14; Ref.12, pp. 42, 299

Arsenic 27.6 1.163 Ref. 6, p. 14; Ref.12, pp. 42, 125

Cadmium 5.1 0.583 Ref. 6, p. 14; Ref.12, pp. 42, 125

Chromium 520 1.163 Ref. 6, p. 14; Ref.12, pp. 42, 125

Lead 771 0.583 Ref. 6, p. 14; Ref.12, pp. 42, 125

Mercury 1.2 0.0532 Ref. 6, p. 14; Ref.12, pp. 42, 125

Zinc 1,020 2.333 Ref. 6, p. 14; Ref.12, pp. 42, 125

Xylenes

P04-71-1 / 

G42510

2.0 1.72 Ref. 6, p. 14; Ref.12, pp. 42, 223

2-Methylnaphthalene 130 902 Ref. 6, p. 14; Ref.12, pp. 42, 267

Naphthalene 48.0 J 902 Ref. 6, p. 14; Ref.12, pp. 42, 267

Arsenic 48.2 1.483 Ref. 6, p. 14; Ref.12, pp. 42, 124

Cadmium 3.5 0.743 Ref. 6, p. 14; Ref.12, pp. 42, 124

Chromium 104 1.483 Ref. 6, p. 14; Ref.12, pp. 42, 124

Lead 520 0.743 Ref. 6, p. 14; Ref.12, pp. 42, 124

Mercury 0.98 0.0743 Ref. 6, p. 14; Ref.12, pp. 42, 124

Zinc 808 2.963 Ref. 6, p. 14; Ref.12, pp. 42, 124

Reassessment Sampling Activities – August 2012

2-Methylnaphthalene

DSE-02-24-413

480 12.24 Ref. 13, pp. 95, 125, 132-135, 158, 371

Dibenzofuran 16.3 12.24 Ref. 13, pp. 95, 125, 132-135, 158, 371

Fluorene 28.1 12.24 Ref. 13, pp. 95, 125, 132-135, 158, 371

Naphthalene 142 12.24 Ref. 13, pp. 95, 125, 132-135, 158, 371

Phenanthrene 72.6 12.24 Ref. 13, pp. 95, 125, 132-135, 159, 371

Antimony 6.3 1.34 Ref. 13, pp. 94, 125, 132-135, 161, 371

Arsenic 26.7 1.34 Ref. 13, pp. 94, 125, 132-135, 161, 371

Cadmium 6.9 0.64 Ref. 13, pp. 94, 125, 132-135, 161, 371

Chromium 179 1.34 Ref. 13, pp. 94, 125, 132-135, 161, 371

Lead 669 1.34 Ref. 13, pp. 94, 125, 132-135, 161, 371

Manganese 502 0.64 Ref. 13, pp. 94, 125, 132-135, 161, 371

Mercury 2.24 0.1714 Ref. 13, pp. 94, 125, 132-135, 162, 371

Benzene

DSE-02-48-413

0.762 0.09994 Ref. 13, pp. 95, 125, 132-135, 163, 372

Ethylbenzene 4.62 0.09994 Ref. 13, pp. 95, 125, 132-135, 164, 372

Isopropylbenzene 1.82 0.09994 Ref. 13, pp. 95, 125, 132-135, 164, 372

meta-/para-Xylene 23.3 0.3994 Ref. 13, pp. 95, 125, 132-135, 164, 372

ortho-Xylene 11.3 0.2004 Ref. 13, pp. 95, 125, 132-135, 164, 372

Toluene 5.09 0.09994 Ref. 13, pp. 95, 125, 132-135, 164, 372
Source Characterization – Source 2

HRS Documentation Record 22 Delta Shipyard

LAD058475419

Hazardous

Substance

Evidence

References Sample ID Concentration

(mg/kg)

Quantitation 

Limit1

(mg/kg)

2-Methylnaphthalene 612 26.64 Ref. 13, pp. 95, 125, 132-135, 166, 372

Anthracene 6.93 1.334 Ref. 13, pp. 95, 125, 132-135, 165, 372

Dibenzofuran 26 3.334 Ref. 13, pp. 95, 125, 132-135, 166, 372

Fluoranthene 3.44 1.334 Ref. 13, pp. 95, 125, 132-135, 166, 372

Fluorene 44.1 1.334 Ref. 13, pp. 95, 125, 132-135, 166, 372

Naphthalene 188 26.64 Ref. 13, pp. 95, 125, 132-135, 166, 372

Phenanthrene 103 26.64 Ref. 13, pp. 95, 125, 132-135, 167, 372

Pyrene 2.09 1.334 Ref. 13, pp. 95, 125, 132-135, 167, 372

Antimony 8.7 1.44 Ref. 13, pp. 94, 125, 132-135, 169, 372

Arsenic 41.9 1.44 Ref. 13, pp. 94, 125, 132-135, 169, 372

Cadmium 10.2 0.74 Ref. 13, pp. 94, 125, 132-135, 169, 372

Chromium 191 1.44 Ref. 13, pp. 94, 125, 132-135, 169, 372

Lead 1,170 1.44 Ref. 13, pp. 94, 125, 132-135, 169, 372

Manganese 726 0.74 Ref. 13, pp. 94, 125, 132-135, 169, 372

Mercury 2.67 0.1764 Ref. 13, pp. 94, 125, 132-135, 169, 372

Benzene

DSE-02-72-413

1.01 0.09994 Ref. 13, pp. 95, 125, 132-135, 171, 372

Ethylbenzene 3.52 0.09994 Ref. 13, pp. 95, 125, 132-135, 172, 372

Isopropylbenzene 1.36 0.09994 Ref. 13, pp. 95, 125, 132-135, 172, 372

meta-/para-Xylene 15.8 0.2004 Ref. 13, pp. 95, 125, 132-135, 172, 372

ortho-Xylene 7.97 0.09994 Ref. 13, pp. 95, 125, 132-135, 172, 372

Toluene 4.48 0.09994 Ref. 13, pp. 95, 125, 132-135, 172, 372

2-Methylnaphthalene 517 13.04 Ref. 13, pp. 95, 125, 132-135, 174, 372

Anthracene 13 13.04 Ref. 13, pp. 95, 125, 132-135, 173, 372

Fluorene 61.7 13.04 Ref. 13, pp. 95, 125, 132-135, 174, 372

Naphthalene 79.9 13.04 Ref. 13, pp. 95, 125, 132-135, 174, 372

Phenanthrene 100 13.04 Ref. 13, pp. 95, 125, 132-135, 175, 372

Pyrene 13.5 13.04 Ref. 13, pp. 95, 125, 132-135, 175, 372

Antimony 4.7 1.34 Ref. 13, pp. 94, 125, 132-135, 177, 372

Arsenic 25.1 1.34 Ref. 13, pp. 94, 125, 132-135, 177, 372

Cadmium 5.6 0.64 Ref. 13, pp. 94, 125, 132-135, 177, 372

Chromium 218 1.34 Ref. 13, pp. 94, 125, 132-135, 177, 372

Lead 590 1.34 Ref. 13, pp. 94, 125, 132-135, 177, 372

Manganese 432 0.64 Ref. 13, pp. 94, 125, 132-135, 177, 372

Mercury 1.1 0.0724 Ref. 13, pp. 94, 125, 132-135, 178, 372

Benzene

DSE-02-96-413

0.732 0.104 Ref. 13, pp. 95, 125, 132-135, 180, 372

Ethylbenzene 6.48 0.104 Ref. 13, pp. 95, 125, 132-135, 180, 372

Isopropylbenzene 2.65 0.104 Ref. 13, pp. 95, 125, 132-135, 180, 372
Source Characterization – Source 2

HRS Documentation Record 23 Delta Shipyard

LAD058475419

Hazardous

Substance

Evidence

References Sample ID Concentration

(mg/kg)

Quantitation 

Limit1

(mg/kg)

meta-/para-Xylene 23.9 0.404 Ref. 13, pp. 95, 125, 132-135, 180, 372

ortho-Xylene 11.8 0.204 Ref. 13, pp. 95, 125, 132-135, 180, 372

Toluene 7.45 0.104 Ref. 13, pp. 95, 125, 132-135, 180, 372

2-Methylnaphthalene 182 10.64 Ref. 13, pp. 95, 125, 132-135, 182, 372

Fluorene 12.8 10.64 Ref. 13, pp. 95, 125, 132-135, 182, 372

Naphthalene 50.6 10.64 Ref. 13, pp. 95, 125, 132-135, 182, 372

Phenanthrene 31.3 10.64 Ref. 13, pp. 95, 125, 132-135, 183, 372

Pyrene 1.27 0.534 Ref. 13, pp. 95, 125, 132-135, 183, 372

Antimony 4.5 1.34 Ref. 13, pp. 94, 125, 132-135, 185, 372

Arsenic 43.9 1.34 Ref. 13, pp. 94, 125, 132-135, 185, 372

Cadmium 5.8 0.74 Ref. 13, pp. 94, 125, 132-135, 185, 372

Chromium 114 1.34 Ref. 13, pp. 94, 125, 132-135, 185, 372

Lead 572 1.34 Ref. 13, pp. 94, 125, 132-135, 185, 372

Manganese 511 0.74 Ref. 13, pp. 94, 125, 132-135, 185, 372

Mercury 0.260 0.0894 Ref. 13, pp. 94, 125, 132-135, 186, 372

Ethylbenzene

DSE-02-120-

413

0.677 0.09994 Ref. 13, pp. 93, 125, 132-135, 140, 371

Isopropylbenzene 0.354 0.09994 Ref. 13, pp. 93, 125, 132-135, 140, 371

meta-/para-Xylene 2.92 J 0.24 Ref. 13, pp. 93, 125, 132-135, 140, 371

ortho-Xylene 1.47 0.09994 Ref. 13, pp. 93, 125, 132-135, 140, 371

Toluene 0.445 0.09994 Ref. 13, pp. 93, 125, 132-135, 140, 371

2-Methylnaphthalene 165 J 1.784 Ref. 13, pp. 93, 125, 132-135, 142, 371

Fluorene 17.2 0.7144 Ref. 13, pp. 93, 125, 132-135, 142, 371

Fluoranthene 0.964 J 0.7144 Ref. 13, pp. 93, 125, 132-135, 142, 371

Dibenzofuran 10.2 1.784 Ref. 13, pp. 93, 125, 132-135, 142, 371

Naphthalene 46.8 J 7.144 Ref. 13, pp. 93, 125, 132-135, 142, 371

Phenanthrene 26.9 J 0.7144 Ref. 13, pp. 93, 125, 132-135, 143, 371

Pyrene 0.909 0.7144 Ref. 13, pp. 93, 125, 132-135, 143, 371

Arsenic 43.1 1.84 Ref. 13, pp. 92, 125, 132-135, 145, 371

Cadmium 1.7 0.94 Ref. 13, pp. 92, 125, 132-135, 145, 371

Chromium 27.1 1.84 Ref. 13, pp. 92, 125, 132-135, 145, 371

Lead 222 1.84 Ref. 13, pp. 92, 125, 132-135, 145, 371

Manganese 379 0.94 Ref. 13, pp. 92, 125, 132-135, 145, 371

Mercury 0.655 0.1214 Ref. 13, pp. 92, 125, 132-135, 146, 371

2-Methylnaphthalene

DSE-02-144-

413

1.39 0.3444 Ref. 13, pp. 93, 125, 132-135, 150, 371

Phenanthrene 0.642 0.3444 Ref. 13, pp. 93, 125, 132-135, 151, 371

Arsenic 6.9 1.64 Ref. 13, pp. 92, 125, 132-135, 153, 371

Chromium 12.7 1.64 Ref. 13, pp. 92, 125, 132-135, 153, 371
Source Characterization – Source 2

HRS Documentation Record 24 Delta Shipyard

LAD058475419

Hazardous

Substance

Evidence

References Sample ID Concentration

(mg/kg)

Quantitation 

Limit1

(mg/kg)

Lead 30.4 1.64 Ref. 13, pp. 92, 125, 132-135, 153, 371

Manganese 210 0.84 Ref. 13, pp. 92, 125, 132-135, 153, 371

Notes:

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

J The identification of the analyte is acceptable; the reported value is an estimate (Ref. 12, p. 193; Ref. 13, p. 380). There is an unknown bias associated 

with these concentrations. 1 The Reporting Limit (RL) terminology used by the EPA Region 6 Laboratory and the Adjusted Contract Required Quantitation Limit (CRQL) and 

Contract Required Detection Limit (CRDL) terminology used by the CLP Laboratory are based on detection limits that have been adjusted for sample 

aliquot, sample volume, and dilutions for the analysis (Ref. 1, Section 1.1, Table 2-3; Ref. 13, pp. 134-135; Ref. 29). 2 Quantitation limit provided is an adjusted CRQL (Ref. 12, pp. 400-405; Ref. 29). 3

 Quantitation limit provided is an adjusted CRDL (Ref. 12, p. 406; Ref. 29). 4

 Quantitation limit provided is an RL (Ref. 13, p. 135; Ref. 29).

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, 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 with reasonable confidence.

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, Section 2.4.2.1.2). There 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, Section 2.4.2.1.3).
Source Characterization – Source 2

HRS Documentation Record 25 Delta Shipyard

LAD058475419

2.4.2.1.3 Tier C: Volume

The information available is not sufficient to adequately determine a volume with reasonable 

confidence for Source 2. There are insufficient historical and current data available to adequately 

calculate the depth of the pits and, therefore, determine the volume of 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).

Volume Assigned Value: 0

2.4.2.1.4 Tier D: Area

The area of Pit 2 (Source 2) was determined by measurements obtained by using Geographic 

Information System (GIS) software (Ref. 19). GIS software contains recent aerial photography of the 

Site, which allows the user to trace an area and determine length and width measurements of the pits 

(Ref. 19). The area of Source 2 was calculated to total 26,875 square feet (Attachment A, Figure A-2;

Ref. 19). The Tier C equation for assigning a value for area of a source type “Surface Impoundment” is 

A/13 (Ref. 1, Table 2-5). Calculations for Pit 2 are as follows:

Pit 2: 215 feet x 125 feet = 26,875 square feet 

Area of Source 2 (square feet): 26,875

Area Assigned Value = 26,875/13

Area Assigned Value = 2,067.307

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 2 Values

A Not Evaluated

B Not Evaluated

C 0

D 2,067.307

Source Hazardous Waste Quantity Value: 2,067.307
Source Characterization – Source 3

HRS Documentation Record 26 Delta Shipyard

LAD058475419

SOURCE DESCRIPTION

2.2 Source Characterization

Source Description: Source 3 – Open Pit 3

Source Type: Surface Impoundment

Source 3 consists of the southernmost open pit (referred to as Pit 3) of three open pits located on the 

property and contains a total area of approximately 35,250 square feet (Attachment A, Figure A-2;

Ref. 13, p. 112; Ref. 19). Source 3 is classified as the HRS source type “Surface Impoundment” (Ref. 

1, Table 2-5). Oily waste from the cleaning process was stored in the unlined earthen pit used as an 

evaporation pond (Ref. 5, p. 3). Currently, the open pit is uncovered and lacks engineered containment 

features; this allows the contents to be exposed to the elements. The pit has no vegetation growing on 

it and has a crusty layer on the surface. The crusty layer on the pit is black and appears to be a dried 

oil/petroleum-type waste (Ref. 7, pp. 1, 3, 5, 6; Ref. 12, pp. 16, 17). Although Pit 3 is separated from 

the other pits by a berm, photo logs from the Site show that its surrounding berms are not maintained, 

contain heavy vegetation, and appear to be insufficient to contain the contents of the pit during a rain 

event (Ref. 7, pp. 1, 3, 5, 6; Ref. 20, pp. 16-18). 

Source Location

The open Pit 3 (Source 3) is the southernmost pit and is located on the south end of the property to the 

east of Dean Court (formerly referred to as Plant Shell Road) and west of Company Canal in a wetland 

area (Ref. 11, p. 3; Ref. 12, p. 23; Ref 14, p. 1). The location of the pit is depicted on Attachment A, 

Figure A-2.

Source Containment

Release To Surface Water

The open earthen Pit 3 is unlined and was originally surrounded by an earthen berm, but the berm is 

not maintained and as the photo logs from the Site show, over time the surrounding wetlands have 

encroached into Source 3 (Ref. 5, p. 3; Ref. 12, pp. 16, 17; Ref. 20, pp. 1-3, 6, 10-13, 17, 18).

The berms are not maintained and contain heavy vegetation (Ref. 7, pp. 1, 3, 4, 6, 9, 11; Ref. 12, pp. 

96-99; Ref. 20, pp. 1-6, 10-13). In addition, Source 3 is located in a special flood hazard area subject to 

inundation by the 1% annual chance of flood (Ref. 18, p. 1).
Source Characterization – Source 3

HRS Documentation Record 27 Delta Shipyard

LAD058475419

Source 3 Overland Flow Containment

Value

Flood Containment

Value

Source 3 is surrounded by HRS 

eligible surface water and source has 

unsound diking that is not regularly 

inspected or maintained (Ref. 7, pp. 1, 

3, 4, 6, 9, 11; Ref. 12, pp. 96-99; Ref. 

20, pp. 1-6, 10-13).

10 -

Source 3 has not been designed, 

constructed, operated, and maintained 

to prevent washout of hazardous 

substances by flooding (Ref. 7, pp. 1, 

3, 4, 6, 9, 11; Ref. 12, pp. 96-99; Ref. 

18, p. 1; Ref. 20, pp. 1-6, 10-13).

- 10 

2.4.1 Hazardous Substances

As part of the ESI sampling conducted by EPA contractors in July 1996, two waste samples and a 

duplicate were collected from the Pit 3 (P05 and P06) (Attachment A, Figure A-5, Ref. 6, p. 14; Ref. 

12, p. 36). The samples were analyzed for VOAs, BNA, and PCBs/pesticides by CLP OLM01.9 and 

for TAL metals and cyanide by CLP ILM04.0 by the CLP laboratories assigned by the EPA (Ref. 12, 

pp. 25, 131, 187). 

As part of reassessment sampling of the Delta Shipyard Site from 06 through 10 August 2012, EPA 

contractors collected two waste samples from two depths from Pit 3 (Attachment A, Figure A-5, Ref. 

13, p. 126). The samples were analyzed for TCL VOCs, TCL SVOCs, pesticides, and PCBs by the 

CLP SOW for Multi-Media, Multi-Concentration Organic Analysis, SOM01.2, and TAL metals with 

mercury by CLP SOW Multi-Media, Multi-Concentration Inorganics Analysis, ISM01.3 (Ref. 13, p. 

5). The samples were submitted to the EPA Region 6 Environmental Services Branch Laboratory, 

located in Houston, Texas (Ref. 13, p. 5). 

Analytical evidence of the contamination in waste source samples associated with Source 3 located on 

the Delta Shipyard Site is summarized below. 

Evidence

Hazardous

Substance

References Sample ID Concentration

(mg/kg)

Quantitation 

Limit1

(mg/kg)

ESI Sampling Activities – July 1996 

Ethylbenzene 8.6 2.32 Ref. 6, p. 14; Ref.12, pp. 42, 219

Toluene 6.4 2.32 Ref. 6, p. 14; Ref.12, pp. 42, 219

Xylenes

P05-71-1/ 

G42508

56.0 2.32 Ref. 6, p. 14; Ref.12, pp. 42, 219

2-Methylnaphthalene 410 1202 Ref. 6, p. 14; Ref.12, pp. 42, 260

Naphthalene 130 1202 Ref. 6, p. 14; Ref.12, pp. 42, 260

Arsenic 61.2 1.063 Ref. 6, p. 14; Ref.12, pp. 42, 122

Cadmium 12.2 0.533 Ref. 6, p. 14; Ref.12, pp. 42, 122
Source Characterization – Source 3

HRS Documentation Record 28 Delta Shipyard

LAD058475419

Evidence

Hazardous

Substance

References Sample ID Concentration

(mg/kg)

Quantitation 

Limit1

(mg/kg)

Chromium 371 1.063 Ref. 6, p. 14; Ref.12, pp. 42, 122

Lead 561 0.533 Ref. 6, p. 14; Ref.12, pp. 42, 122

Mercury 0.81 0.0533 Ref. 6, p. 14; Ref.12, pp. 42, 122

Zinc 2,160 2.133 Ref. 6, p. 14; Ref.12, pp. 42, 122

Ethylbenzene 9.0 2.12 Ref. 6, p. 14; Ref.12, pp. 43, 221

Toluene 7.4 2.12 Ref. 6, p. 14; Ref.12, pp. 43, 221

Xylenes 59.0 2.12 Ref. 6, p. 14; Ref.12, pp. 43, 221

2-Methylnaphthalene 470 1102 Ref. 6, p. 14; Ref.12, pp. 43, 263

Naphthalene

P05-72-1/ 

G42509

160 1102 Ref. 6, p. 14; Ref.12, pp. 43, 263

Arsenic 48.9 1.173 Ref. 6, p. 14; Ref.12, pp. 43, 123 

Cadmium 15.2 0.583 Ref. 6, p. 14; Ref.12, pp. 43, 123

Chromium 384 1.173 Ref. 6, p. 14; Ref.12, pp. 43, 123

Lead 525 0.583 Ref. 6, p. 14; Ref.12, pp. 43, 123

Mercury 0.76 0.0583 Ref. 6, p. 14; Ref.12, pp. 43, 123

Zinc 2,500 3.423 Ref. 6, p. 14; Ref.12, pp. 43, 123

Xylenes 13.0 2.42 Ref. 6, p. 14; Ref.12, pp. 43, 217 

Heptachlor epoxide

P06-71-1/ 

G42507

0.078 0.0332 Ref. 6, p. 14; Ref.12, pp. 43, 295 

Cadmium 6.2 0.0513 Ref. 6, p. 14; Ref.12, pp. 43, 121

Chromium 451 1.023 Ref. 6, p. 14; Ref.12, pp. 43, 121

Mercury 0.85 0.0513 Ref. 6, p. 14; Ref.12, pp. 43, 121

Zinc 1,190 3.493 Ref. 6, p. 14; Ref.12, pp. 43, 121 

Reassessment Sampling Activities – August 2012

Ethylbenzene

DSE-03-24-413

0.163 0.104 Ref. 13, pp. 97, 126, 132-135, 261, 377

Isopropylbenzene 0.286 0.104 Ref. 13, pp. 97, 126, 132-135, 261, 377

meta-/para-Xylene 0.812 0.204 Ref. 13, pp. 97, 126, 132-135, 261, 377

ortho-Xylene 0.501 0.104 Ref. 13, pp. 97, 126, 132-135, 261, 377

Toluene 0.103 0.104 Ref. 13, pp. 97, 126, 132-135, 261, 377

2-Methylnaphthalene 98.4 15.04 Ref. 13, pp. 97, 126, 132-135, 262, 377

Anthracene 2.55 1.54 Ref. 13, pp. 97, 126, 132-135, 262, 377

Fluorene 11.6 1.54 Ref. 13, pp. 97, 126, 132-135, 262, 377

Naphthalene 10.6 1.54 Ref. 13, pp. 97, 126, 132-135, 263, 377

Phenanthrene 23.5 1.54 Ref. 13, pp. 97, 126, 132-135, 264, 377

Pyrene 2.2 1.54 Ref. 13, pp. 97, 126, 132-135, 264, 377

Arsenic 18.1 1.54 Ref. 13, pp. 96, 126, 132-135, 266, 377

Cadmium 1.7 0.84 Ref. 13, pp. 96, 126, 132-135, 266, 377

Lead 194 1.54 Ref. 13, pp. 96, 126, 132-135, 266, 377
Source Characterization – Source 3

HRS Documentation Record 29 Delta Shipyard

LAD058475419

Hazardous

Substance

Evidence

References Sample ID Concentration

(mg/kg)

Quantitation 

Limit1

(mg/kg)

Manganese 304 0.84 Ref. 13, pp. 96, 126, 132-135, 266, 377

Mercury 0.478 0.0844 Ref. 13, pp. 96, 126, 132-135, 267, 377

Ethylbenzene

DSE-03-48-413

0.223 0.09994 Ref. 13, pp. 97, 126, 132-135, 271, 377

Isopropylbenzene 0.109 0.09994 Ref. 13, pp. 97, 126, 132-135, 271, 377

meta-/para-Xylene 0.891 0.204 Ref. 13, pp. 97, 126, 132-135, 271, 377

ortho-Xylene 0.463 0.09994 Ref. 13, pp. 97, 126, 132-135, 271, 377

Toluene 0.153 0.09994 Ref. 13, pp. 97, 126, 132-135, 271, 377

2-Methylnaphthalene 21.8 3.154 Ref. 13, pp. 97, 126, 132-135, 273, 377

Anthracene 0.455 0.3154 Ref. 13, pp. 97, 126, 132-135, 272, 377

Dibenzofuran 0.913 0.7884 Ref. 13, pp. 97, 126, 132-135, 273, 377

Fluoranthene 0.520 0.3154 Ref. 13, pp. 97, 126, 132-135, 273, 377

Fluorene 2.63 0.3154 Ref. 13, pp. 97, 126, 132-135, 273, 377

Naphthalene 5.19 3.154 Ref. 13, pp. 97, 126, 132-135, 273, 377

Phenanthrene 4.93 0.3154 Ref. 13, pp. 97, 126, 132-135, 274, 377

Pyrene 0.701 0.3154 Ref. 13, pp. 97, 126, 132-135, 274, 377

Arsenic 26.6 1.44 Ref. 13, pp. 95, 126, 132-135, 276, 377

Cadmium 0.7 0.74 Ref. 13, pp. 95, 126, 132-135, 276, 377

Lead 25.9 1.44 Ref. 13, pp. 95, 126, 132-135, 276, 377

Manganese 541 0.74 Ref. 13, pp. 95, 126, 132-135, 276, 377

Mercury 0.207 0.0814 Ref. 13, pp. 95, 126, 132-135, 277, 377

Notes:

mg/kg = milligrams per kilogram = 1,000 micrograms per kilogram (ug/kg) 1 The Reporting Limit (RL) terminology used by the EPA Region 6 Laboratory and the Adjusted Contract Required Quantitation Limit (CRQL) and 

Contract Required Detection Limit (CRDL) terminology used by the CLP Laboratory are based on detection limits that have been adjusted for sample 

aliquot, sample volume, and dilutions for the analysis (Ref. 1, Section 1.1, Table 2-3; Ref. 13, pp. 134-135; Ref. 29). 2 Quantitation limit provided is an adjusted CRQL (Ref. 12, pp. 400-405; Ref. 29). 3

 Quantitation limit provided is an adjusted CRDL (Ref. 12, p. 406; Ref. 29). 4

 Quantitation limit provided is an RL (Ref. 13, p. 135; Ref. 29). 

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 3 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, PRP records, State records, permits, waste concentration data, 

etc.) available to adequately calculate the total mass of all CERCLA hazardous substances in the 
Source Characterization – Source 3

HRS Documentation Record 30 Delta Shipyard

LAD058475419

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 3 with reasonable confidence. 

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

The hazardous wastestream quantity for Source 3 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, Section 2.4.2.1.2). There 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 3 with reasonable confidence. Scoring 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 information available is not sufficient to adequately determine a volume with reasonable 

confidence for Source 3. There are insufficient historical and current data available to adequately 

calculate the depth of the pits and, therefore, determine the volume of Source 3. Source 3 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). 

Volume Assigned Value: 0 

2.4.2.1.4 Tier D: Area

The area of Pit 3 (Source 3) was determined by measurements obtained by using GIS software (Ref. 

19). GIS software contains recent aerial photography of the Site, which allows the user to trace an area 

and determine length and width measurements of the pits (Ref. 19). The area of Source 3 was

calculated to total 35,250 square feet (Attachment A, Figure A-2; Ref. 19). The Tier C equation for 

assigning a value for area of a source type “Surface Impoundment” is A/13 (Ref. 1, Table 2-5). 

Calculations for Pit 3 are as follows:

Pit 3: 235 feet x 150 feet = 35,250 square feet

Area of Source 3 (square feet): 35,250 

Area Assigned Value = 35250/13 

Area Assigned Value = 2,711.538 
Source Characterization – Source 3

HRS Documentation Record 31 Delta Shipyard

LAD058475419

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 3 Values

A Not Evaluated

B Not Evaluated

C 0

D 2,711.538

Source Hazardous Waste Quantity Value: 2,711.538
Source Characterization – Source 4

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LAD058475419

SOURCE DESCRIPTION

2.2 Source Characterization 

Source Description: Source 4 –Drainage Ditch

Source Type: Other

Source 4 consists of the manmade drainage ditch that was designed to be part of the waste 

management system, which incorporates the pits in Sources 1 through 3. Source 4 is west of and runs 

parallel to Pits 1 through 3. It then turns east, south of Pit 3, and drains to Company Canal (Ref. 12, p. 

52). Pit 2 (Source 2) contains an overflow pipe which is known to have discharged to the drainage 

ditch (Source 4) (Ref. 12, pp. 52, 54, 94; Ref. 13, p. 8). Source 4 was used for overflow of Sources 1 

through 3 and was developed around the same time as the pits, around the mid-1970s (Ref. 30, pp. 1-

4). There is a series of un-maintained weirs located within the ditch, south of Source 3 (Ref. 7, pp. 10-

12). 

Source 4 is classified as the HRS source type “Other” (Ref. 1, Table 2-5). 

Source Location

The drainage ditch (Source 4) is located to the west and south of Source 1 through 3 and to the east of 

Dean Court (formerly referred to as Plant Shell Road) and west of Company Canal in a wetland area 

(Ref. 11, p. 3; Ref. 12, p. 23; Ref 14, p. 1). The location of the drainage ditch is depicted on 

Attachment A, Figure A-2. 

Source Containment

Release To Surface Water

Source 4, the drainage ditch, is unlined, and it is located within a wetland (Ref. 5, p. 3; Ref. 12, pp. 16, 

17; Ref. 20, pp. 1-3, 6, 10-13, 17, 18). 

In addition, Source 4 is located in a special flood hazard area subject to inundation by the 1% annual 

chance of flood (Ref. 18, p. 1). 

Source 4 Overland Flow Containment

Value

Flood Containment

Value

Source 4 is located within wetlands, HRS eligible 

surface water (Ref. 7, pp. 1, 3, 4, 6, 9, 11; Ref. 12, 

pp. 96-99; Ref. 20, pp. 1-6, 10-13).

10 -

Source 4 has not been designed, constructed, 

operated, and maintained to prevent washout of 

hazardous substances by flooding (Ref. 7, pp. 1, 3, 4, 

6, 9, 11; Ref. 12, pp. 96-99; Ref. 18, p. 1; Ref. 20, pp. 

1-6, 10-13).

- 10 
Source Characterization – Source 4

HRS Documentation Record 33 Delta Shipyard

LAD058475419

2.4.1 Hazardous Substances

As part of the ESI sampling conducted by EPA contractors in July 1996, four waste samples and two 

duplicates were collected from the drainage ditch (D01, D02, D03 and D04) (Attachment A, Figure A5, Ref. 6, p. 16; Ref. 12, p. 30). The samples were analyzed for VOAs, BNA, and PCBs/pesticides by

CLP OLM01.9 and for TAL metals and cyanide by CLP ILM04.0 by the CLP laboratories assigned by 

the EPA (Ref. 12, pp. 25, 131, 187). 

As part of reassessment sampling of the Delta Shipyard Site from 06 through 10 August 2012, EPA 

contractors collected waste samples from four locations at various depths from the drainage ditch

(Attachment A, Figure A-5, Ref. 13, p. 125). The samples were analyzed for TCL VOCs, TCL 

SVOCs, pesticides, and PCBs by the CLP SOW for Multi-Media, Multi-Concentration Organic 

Analysis, SOM01.2, and TAL metals with mercury by CLP SOW Multi-Media, Multi-Concentration 

Inorganics Analysis, ISM01.3 (Ref. 13, p. 5). The samples were submitted to the EPA Region 6

Environmental Services Branch Laboratory, located in Houston, Texas (Ref. 13, p. 5). 

Analytical evidence of the contamination in waste source samples associated with Source 4 located on 

the Delta Shipyard Site is summarized below. 

Hazardous

Substance

Evidence

References Sample ID Concentration

(mg/kg)

Quantitation 

Limit1

(mg/kg)

ESI Sampling Activities – July 1996 

Chromium D01-51-1/ 

MFGY33

75.2 23 Ref. 6, p. 16; Ref.12, pp. 61, 445

Zinc 2350 43 Ref. 6, p. 16; Ref.12, pp. 62, 445

2-Methylnaphthalene

D02-51-1/

FFE74/

MFGY34

1.5 J 0.802 Ref. 6, p. 16; Ref.12, pp. 61, 435

Naphthalene 0.860 J 0.802 Ref. 6, p. 16; Ref.12, pp. 61, 437

Phenanthrene 0.880 J 0.802 Ref. 6, p. 16; Ref.12, pp. 61, 221

Chromium 123 23 Ref. 6, p. 16; Ref.12, pp. 61, 123 

Benzo(b)fluoranthene D02-52-1/

FFE75/

MFGY35

1.1 J^ 0.732 Ref. 6, p. 16; Ref.12, pp. 61, 436

Benzo(k)fluoranthene 1.1 J^ 0.732 Ref. 6, p. 16; Ref.12, pp. 61, 436

Chromium 92.1 23 Ref. 6, p. 16; Ref.12, pp. 61, 445

Chromium D03-52-1/

MFGY37 68.4

23 Ref. 6, p. 16; Ref.12, pp. 61, 445

Chromium D04-51-1/

MFGY38 232

13 Ref. 6, p. 16; Ref. 12, pp. 61, 446

Reassessment Sampling Activities – August 2012

Arsenic

DSE-07/ 24”

(MF6AA6)

54.7 0.924 Ref. 13, pp. 

423

30, 125, 386-388, 400, 416, 

Mercury 0.32 0.134 Ref. 13, pp. 

423

30, 125, 386-388, 400, 416, 
Source Characterization – Source 4

HRS Documentation Record 34 Delta Shipyard

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Hazardous

Substance

Evidence

References Sample ID Concentration

(mg/kg)

Quantitation 

Limit1

(mg/kg)

Cadmium

DSE-10/ 12”

(MF6AB0) 3.8 0.464 Ref. 13, pp. 16, 125, 386-388, 404, 417, 

424

Mercury 0.85 0.124 Ref. 13, pp. 16, 125, 386-388, 404, 417, 

424

Fluorene DSE-10/ 24”

(F6AB1)

1.6 1.04 Ref. 13, pp. 33, 125, 428-430, 435, 470, 

500

Phenanthrene 3.5 1.04 Ref. 13, pp. 33, 125, 428-430, 435, 470, 

500

Arsenic

DSE-10/ 24”

(MF6AB1)

62.5 0.924 Ref. 13, pp. 32, 125, 385-388, 405, 418, 

424

Cadmium 18.3 0.464 Ref. 13, pp. 32, 125, 385-388, 405, 418, 

424

Chromium 52.6 0.924 Ref. 13, pp. 32, 125, 385-388, 405, 418, 

424

Lead 2,170 J 0.924 Ref. 13, pp. 32, 125, 385-388, 405, 418, 

424

Manganese 671 1.44 Ref. 13, pp. 32, 125, 385-388, 405, 418, 

424

Mercury 1.8 0.124 Ref. 13, pp. 32, 125, 385-388, 405, 418, 

424

Arsenic DSE-13/ 24”

(MF6AB8)

27.7 1.04 Ref. 13, pp. 32, 125, 385-388, 411, 419, 

425

Manganese 531 1.54 Ref. 13, pp. 32, 125, 385-388, 411, 419, 

425

Arsenic

DSE-16/ 24”

(MF6AC9)

36.1 J 1.04 Ref. 13, pp. 32, 125, 711-714, 722, 741, 

750

Cadmium 1.0 0.54 Ref. 13, pp. 32, 125, 711-714, 722, 741, 

750

Lead 189 1.04 Ref. 13, pp. 32, 125, 711-714, 722, 741, 

750

Notes:

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

J The identification of the analyte is acceptable; the reported value is an estimate (Ref. 12, p. 193; Ref. 13, p. 380). There is an unknown bias associated 

with these concentrations.

^ High bias (Ref. 12, p. 134). 1 The Reporting Limit (RL) terminology used by the EPA Region 6 Laboratory and the Adjusted Contract Required Quantitation Limit (CRQL) and 

Contract Required Detection Limit (CRDL) terminology used by the CLP Laboratory are based on detection limits that have been adjusted for sample 

aliquot, sample volume, and dilutions for the analysis (Ref. 1, Section 1.1, Table 2-3; Ref. 13, pp. 134-135; Ref. 29). 2 Quantitation limit provided is an adjusted CRQL (Ref. 12, pp. 400-405; Ref. 29). 3

 Quantitation limit provided is an adjusted CRDL (Ref. 12, p. 406; Ref. 29). 4

 Quantitation limit provided is an RL (Ref. 13, p. 135; Ref. 29). 

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 4 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 
Source Characterization – Source 4

HRS Documentation Record 35 Delta Shipyard

LAD058475419

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

historical and current data (manifests, 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 4 with reasonable confidence. 

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

The hazardous wastestream quantity for Source 4 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, Section 2.4.2.1.2). There 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 4 with reasonable confidence. Scoring proceeds to the evaluation of Tier C, 

volume (Ref. 1, Section 2.4.2.1.3).

2.4.2.1.3 Tier C: Volume

There are insufficient historical and current data available to adequately calculate the depth of the 

drainage ditch, however, it is documented that the waste in the source contains hazardous substances

(see Section 2.4.1 for Source 4 of this report). Therefore, Source 4 has been assigned a value of

unknown but >0 for the volume measure (Ref. 1, Section 2.4.2.1.3). 

Volume Assigned Value: >0, but unknown 

2.4.2.1.4 Tier D: Area 

Per the HRS, as a value of unknown but >0 has been assigned to the volume measure, the area measure 

is not evaluated (Ref. 1, Section 2.4.2.1.3). 

Area Assigned Value = 0 

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). 

 

 
Source Characterization – Source 4

HRS Documentation Record 36 Delta Shipyard

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Tier Evaluated Source 4 Values

A Not Evaluated

B Not Evaluated

C >0, but unknown

D 0

Source Hazardous Waste Quantity Value: >0, but unknown 
Other Sources

HRS Documentation Record 37 Delta Shipyard

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Other Sources Not Scored

The backfilled pit area, referred to as Pit 4, covers approximately 23,800 square feet (ft2), contains 

vegetation and trash, and is differentiated from the surrounding land as mounds within a relatively flat 

topographic area (Ref. 7, p. 7; Ref. 19). Pit 4 is located approximately 160 feet west of Source 1 (Pits 

1 through 3) and west of Dean Court (formerly referred to as Plant Shell Road), within a grassy area of 

wetland (Ref. 11, p. 15; Ref. 12, p. 23; Ref. 14, p. 1). This area was observed in 1985 to have a thin 

crust of fill and an overgrowth of vegetation. At one time this pit was actually three surface 

impoundments; however, the individual pits are no longer discernible (Ref. 9, p. 4; Ref. 11, p. 6; Ref. 

12, pp. 17, 20). These impoundments were used for storage of disposed oil-field drilling material (Ref. 

9, p. 4). As part of reassessment sampling of the Delta Shipyard Site from 06 through 10 August 2012, 

two waste samples collected by EPA contractors from Pit 4 indicated the presence of 

benzo(g,h,i)perylene, 2-butanone, cadmium, and antimony (Ref. 13, p. 2, 10, 20, 28, 130). The 

backfilled pit area is not used in scoring. 
Sources

HRS Documentation Record 38 Delta Shipyard

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SITE SUMMARY OF SOURCE DESCRIPTIONS

Source

No.

Source Hazardous 

Waste Quantity

Value

Containment Factor Value

Ground Water Surface Water Gas Air Particulate

1 1,826.923 NE 10 NE NE

2 2,067.307 NE 10 NE NE

3 2,711.538 NE 10 NE NE

4 >0, but unknown NE 10 NE NE

TOTAL >6,605.768 NE 10 NE NE

 NE = Not Evaluated
GW Pathway – Not Scored

HRS Documentation Record 39 Delta Shipyard

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3.0 GROUND WATER MIGRATION PATHWAY SCORE - NOT SCORED

The ground water migration pathway is not 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.

Although there is evidence of contamination through sampling of two monitoring wells, there is a lack 

of ground water drinking water targets (Ref. 12, pp. 46, 47). There are no drinking water wells located 

within 4 miles of the Site, and ground water is not known to be used as a resource in the area (Ref. 12, 

p. 47). Two monitoring wells were completed at depths of 16 feet bgs and 24 feet bgs, respectively in 

an approximately 100-foot-wide strip of land between the pits and Company Canal during the EPA 

ESI sampling event in 1996 (Ref. 12, p. 46). Elevated ground water concentrations of 2-

methylnaphthalene (65 micrograms per liter (μg/L)), naphthalene (23 μg/L), phenanthrene (9 μg/L), 

barium (29,400 μg/L), chromium (507 μg/L), lead (482 μg/L), and zinc (3,290 μg/L) were detected. 

All of these constituents were also detected in samples collected from the three open pits (Source 1)

(Ref. 12, p. 46).

 
SW Pathway – Overland/Flood Migration

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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, Section 

4.1.1.1). There is one watershed for the hazardous substance migration path that begins on-facility at 

the wetland; therefore, there is no overland segment. The wetland is the beginning of the in-water 

segment for Source 1, which is described in the following text. The surface water pathway is 

presented on Figures A-3 and A-4. 

In-Water Segments

The target distance limit (TDL) for the surface water pathway, which defines the maximum distance 

over which targets are considered, is 15 miles. Although the eligible surface water bodies within the 

TDL are considered tidally influenced, the Site is located approximately 50 stream miles from the Gulf 

Coast, and the water in the area is freshwater. Therefore, the tidal carry within the TDL is not 

considered influential and was not evaluated (Ref. 21, pp. 8, 12). The TDL of the surface water flow 

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

The in-water segment begins at the probable point of entry (PPE) to an eligible surface water body as 

defined in the HRS (Ref. 1, Sec. 4.1.1). The eligible surface water bodies that have been determined to 

be part of the in-water segment for the Delta Shipyard Site are the Palustrine System, Scrub-Shrub, 

Broad-Leaved Deciduous, Temporary-Tidal (PSS1S) wetland, which is contiguous to a perennially 

flowing river, the Company Canal (Attachment A, Figure A-4; Ref. 1, Sec. 4.0.2; Ref. 14, pp. 1-2). 

The PSS1S wetland meets the 40 CFR 230.3 definition of a wetland and, therefore, is eligible for 

evaluation under the HRS as a surface water body (Ref. 1, Sec. 4.0.2). For HRS purposes, the term 

wetlands means those areas that are inundated or saturated by surface or ground water at a frequency 

and duration sufficient to support, and that under normal circumstances do support, a prevalence of 

vegetation typically adapted for life in saturated soil conditions. Wetlands generally include swamps, 

marshes, bogs and similar areas (Ref. 15, pp. 3-4). The pits themselves are considered Palustrine, 

unconsolidated bottom, non-tidal permanent water regime, excavated (PUBHx) wetlands and are manmade excavated ponds that were created to hold waste. This type of wetland may not always meet the 

HRS (40 CFR 230.3) definition of a wetland (Ref. 14, pp. 1, 9). The vegetated areas along the former 

boundaries of the pits, which consist of PSS1S wetlands, are encroaching into the pits. Additionally, 

the drainage ditch is located within the PSS1S wetlands (Ref. 14, pp. 1, 9; Ref. 20, pp. 3-6, 10-13, 32-

36, 38-39). The areas of the sources were historically wetland areas until their development between 

1974 and 1978 (Ref. 30, pp. 1-4; Ref. 31, pp. 1-2). 

There are multiple PPEs to the surface water pathway, and the entire boundary of each source could be 

considered to be PPEs, although only one PPE is illustrated for each source at the point at which entry 

of the hazardous substances to surface water is considered most likely. For Sources 1 through 3, there 

is at least one point each (PPE1 through PPE3), located along the eastern edges of the pits which are in 

direct contact with the HRS eligible wetland. The topography of the Delta Shipyard Site is relatively 
SW Pathway – Overland/Flood Migration

HRS Documentation Record 41 Delta Shipyard

LAD058475419

flat and discharge from the pits would continue through sheet flow through the wetland and into 

Company Canal to the east. The PPE for Source 4 (PPE4) is located where the drainage ditch enters 

Company Canal. While there is an open pipe that allows discharges from Source 4 to enter Company 

Canal located immediately east of the site, wastes can also enter from around the pipe (Ref. 11, p. 7; 

Ref. 12, p. 52; Ref. 20, p. 30). From PPE4, Company Canal flows south for approximately 1,000 feet 

until reaching Bayou LaCarpe. Bayou LaCarpe flows south approximately 3,500 feet to its confluence 

with the Houma Navigation Canal. The Houma Navigation Canal, which is a part of the Company 

Canal, completes the 15-mile TDL (Attachment A, Figure A-3; Ref. 3, pp. 1-3; Ref. 12, p. 53). 
SW Pathway – Likelihood of Release

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4.1.2.1 LIKELIHOOD OF RELEASE

4.1.2.1.1 Observed Release

 

Direct Observation

An observed release is established by direct observation. Wastes containing hazardous substances 

generated from historical operations at the facility are in direct contact with wetlands (Ref. 20, pp. 3-6, 

10-13, 32-36, 38-39). The pits and drainage ditch were used as evaporation ponds and part of a waste 

management system for the storage of oily wastes from boat cleaning operations and oil field drilling 

(Ref. 9, p. 4; Ref. 12, p. 16). These wastes contain hazardous substances based on samples collected 

from the pits in 1996 and 2012 (see Section 2.2 for Source 1, 2, 3 and 4 of this report). The wetlands 

are encroaching into the pits, and the drainage ditch is within the wetland (Ref 14, pp. 1, 9). Wetlands 

have historically covered the area where the sources are located and were present before the pits and 

drainage ditch were developed sometime between 1974 and 1978 (Ref. 14, pp. 1, 9; Ref. 30, pp. 1-4). 

The Terrebonne Parish Soil Survey from 1960 shows the soils in the area of the sources were 

categorized as Swamp, clays and murky clays (Ref. 31, pp. 1-2). The wetlands are currently reemerging into the sources (Ref. 20, pp. 3-6, 10-13, 32-36, 38-39). Therefore, material containing 

hazardous substances is in direct contact with an HRS-defined surface water body, the PSS1S wetlands 

that surround the sources and are contiguous to Company Canal (Ref. 1, Sec. 4.0.2; Ref. 14, pp. 1-3). 

 

The sources at the Site are uncontained and located within a wetland. Due to historical operations at 

the Site (operations that have demonstrated to cause releases of arsenic, antimony, anthracene, 

benzene, cadmium, chromium, ethylbenzene, fluorene, lead, manganese, mercury, 2-

methylnaphthalene, naphthalene, phenanthrene, pyrene, o-xylene, and m,p-xylene contamination as 

shown through sampling results of the source) combined with the overall lack of containment of the 

source at the Site (see Section 2.2 for Source 1, 2, 3 and 4 of this report), the HRS criteria for observed 

release by direct observation have been met (Ref. 1, Sec. 4.1.2.1.1). 

In addition, there is an observed release by chemical analysis established from the Site. During the 

August 2012 sampling activities, samples collected from within the wetland show elevated 

concentrations of hazardous substances as described below. 

Chemical Analysis

Surface water and sediment samples were collected during the August 2012 EPA Reassessment 

sampling activities (Ref. 13, p. 4). For the purpose of this HRS evaluation, only the sediment samples 

are being discussed. Seventeen sediment samples (including one duplicate) were collected from the 

wetlands surrounding Sources 1-3 and one for the Company Canal at the mouth of the drainage ditch

(Source 4) (Attachment A, Figure A-5; Ref. 13, p. 4; Ref. 14, pp. 1, 9). Sample locations are depicted 

in Figure A-5 of Attachment A. 

Background Concentrations:

Two background sediment samples were collected from the wetland (DSE-21/12” and 24”) 

immediately east and slightly upgradient of Pit 1, of Source 1 (Attachment A, Figure A-5; Ref. 13, p.

120). The background sediment samples contaminant concentrations collected from the wetland are
SW Pathway – Likelihood of Release

HRS Documentation Record 43 Delta Shipyard

LAD058475419

compared to site-related wetland sediment samples concentrations collected from the same wetland 

area to investigate whether a release from the Site to the surrounding wetlands can be established (Ref. 

13, pp. 3, 4). 

A background sediment sample was also collected from Company Canal upstream of the facility, and 

the sample contamination levels are compared to the canal release sample contamination levels 

(Attachment A, Figure A-3, Ref. 13, p. 4; Ref. 16, p. 22). 

The background sediment samples from the wetlands and the Company Canal were collected on 09 

August 2012 by EPA contractors (Ref. 13, pp. 107, 120). The wetland sediment samples were 

collected using a direct push technology subsurface coring device. The direct push cores were

advanced to a depth of 8 feet bgs with samples collected at 0 to 12 inches, 1 to 2 feet, 2 to 4 feet, 4 to 6 

feet, and 6 to 8 feet, although only samples collected from 12 and 24 inches were used. The Company 

Canal sediment sample was collected from 0 to 12 inches using a plastic disposable scoop. Once 

collected, the sediment sample bottles were placed on ice until shipping (Ref. 13, pp. 4, 5). The 

background samples and the samples collected to demonstrate the presence of contamination, the 

potential migration path, and to demonstrate observed releases were all collected during the same time 

frame during the same sampling event (Ref. 13, p. 4). The samples were collected by the same field 

team during the same sampling event, following the same sample collection protocols and 

methodologies. The background samples were collected from a similar location (within the same 

wetland or surface water body), were from similar media, same depth, used the same sampling 

methods, preservation, and handling, and were all collected under the same weather conditions as the 

release samples (Ref. 13, pp. 4, 5, 103-107, 110-122).

Sediment samples for organic analysis were shipped to the CLP contracted laboratory, Mitkem

Laboratories, located in Warnick, Rhode Island for analysis of VOCs, SVOCs, pesticides, and PCBs. 

Sediment samples for inorganic analysis for all samples but CC-01were shipped to the CLP contracted

laboratory, Chem Tech, located in Mountainside, New Jersey, for metals analysis (Ref. 13, pp. 125-

130). CC-01 was submitted to the EPA Region 6 Environmental Services Branch Laboratory, located 

in Houston, Texas for inorganic analysis (Ref. 13, p. 5). The samples were analyzed for VOCs, 

SVOCs, Pesticides, and PCBs by CLP SOM01.2 and for TAL metals and mercury by CLP ISM01.3 

(Ref. 13, p. 5). 

EPA Reassessment Sampling Event - Background Sample Description

August 2012 

Station Location

(Sample ID) Sample Location Sample Date (Military Time) Reference

Sediment

DSE-21/12” and 24”

(DSE-21-12-

515/MF6AM2/F6AM2, DSE-21-

24-515/MF6AM3/F6AM3) 

Upgradient (northeast) of open Pit 

1 location within the wetland

08/09/2012

(1305) Ref. 13, pp. 128, 642, 1025

CC-01

(CC-01-03-611/ F6AL0)

Upstream of the Site within 

Company Canal

08/09/2012 

(1115) Ref. 13, pp. 107, 379, 1112
SW Pathway – Likelihood of Release

HRS Documentation Record 44 Delta Shipyard

LAD058475419

EPA Reassessment Sampling Event - Background Sample Concentrations

August 2012 

Summary of Delta Shipyard Designated Background Concentrations

Hazardous 

Substance Evidence Reference

Sediment - Wetland

Station 

Location/

Sample ID

Concentration

mg/kg

Quantitation 

Limit1 

mg/kg

2-Methylnaphthalene DSE-21/ 12” 

F6AM2 0.22 U 0.222 Ref. 13, pp. 20, 929-935, 941-942, 

996, 1025

Chromium DSE-21/ 12” 

MF6AM2

92.6 1.02 Ref. 13, pp.20, 899-903, 910, 915

Lead 211 1.02 Ref. 13, pp.20, 899-903, 910, 915

Mercury 0.27 0.122 Ref. 13, pp.20, 899-903, 910, 915

Ethylbenzene

DSE-21/ 24” 

F6AM3

0.0081 U 0.00812 Ref. 13, pp. 35, 929-935, 943-944, 

970, 1026

o-Xylene 0.0081 U 0.00812 Ref. 13, pp. 35, 929-935, 943-944, 

970, 1026

m,p-Xylene 0.0081 U 0.00812 Ref. 13, pp. 35, 929-935, 943-944, 

970, 1026

Isopropylbenzene 0.0081 U 0.00812 Ref. 13, pp. 35, 929-935, 943-944, 

970, 1026

Benzo(g,h,i)perylene 0.270 U 0.2702 Ref. 13, pp. 35, 929-935, 946, 998, 

1026

Naphthalene 0.270 U 0.2702 Ref. 13, pp. 35, 929-935, 945-946, 

997, 1025

2-Methylnaphthalene 0.270 U 0.2702 Ref. 13, pp. 34, 929-935, 945-946, 

997, 1025

Fluorene 0.270 U 0.2702 Ref. 13, pp. 35, 929-935, 945-946, 

997, 1025

Fluoranthene 0.270 U 0.2702 Ref. 13, pp. 35, 929-935, 945-946, 

998, 1025

Phenanthrene 0.270 U 0.2702 Ref. 13, pp. 35, 929-935, 945-946, 

997, 1025

Pyrene 0.270 U 0.2702 Ref. 13, pp. 35, 929-935, 945-946, 

998, 1025

Anthracene 0.270 U 0.2702 Ref. 13, pp. 34, 929-935, 945-946, 

998, 1025

Arsenic

DSE-21/ 24”

MF6AM3

5.6 1.12 Ref. 13, pp. 34, 899-903, 911, 915

Chromium 16.3 1.12 Ref. 13, pp. 34, 899-903, 911, 915

Cadmium 0.31 LJ 0.562 Ref. 13, pp. 34, 899-903, 911, 915

Lead 35.6 1.12 Ref. 13, pp. 34, 899-903, 911, 915

Manganese 135 (167.4) J* 1.72 Ref. 13, pp. 34, 899-906, 911, 915

Mercury 0.086 LJ 0.152 Ref. 13, pp. 34, 899-903, 911, 915
SW Pathway – Likelihood of Release

Sediment – Company 

Canal

Station 

Location/

Sample ID

Concentration

mg/kg

Quantitation 

Limit1 

mg/kg

HRS Documentation Record 45 Delta Shipyard

LAD058475419

Arsenic

CC-01-03-611/

MF6AL0

24.0 1.83 Ref. 13, pp. 132-135, 299, 379

Lead 20.9 1.83 Ref. 13, pp. 132-135, 299, 379

Chromium 9.8 1.83 Ref. 13, pp. 132-135, 298, 379

Zinc 80.9 3.63 Ref. 13, pp. 132-135, 298, 379

Fluoranthene CC-01-03-611/

F6AL0

0.33 U 0.332 Ref. 13, pp. 1048-1052, 1055, 

1095, 1112

Pyrene 0.33 U 0.332 Ref. 13, pp. 1048-1052, 1055, 

1095, 1112

Notes:

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

U Not detected at reported quantitation limit (Ref. 13, pp. 938, 1055).

J Result is estimated because of outlying quality control parameters such as matrix spike, serial dilution, etc., or the result is below the Contract 

Required Quantitation Limit (CRQL) (Ref. 13, pp. 904, 906). *

 Result has been adjusted according to the EPA Fact Sheet (Ref. 17) and is shown in parentheses. There is an unknown bias associated with this 

concentration.

L Reported concentration is between the MDL and the CRQL (Ref. 13, p .906). There is no bias associated with these concentrations. 1 The Reporting Limit (RL) terminology used by the EPA Region 6 Laboratory and the Adjusted Contract Required Quantitation Limit (CRQL) and 

Contract Required Detection Limit (CRDL) terminology used by the CLP Laboratory are based on detection limits that have been adjusted for sample 

aliquot, sample volume, and dilutions for the analysis (Ref. 1, Section 1.1, Table 2-3; Ref. 13, pp. 134-135; Ref. 29). 2 Quantitation limit provided is an adjusted CRQL (Ref. 13, pp. 905, 937; Ref. 29). 3

 Quantitation limit provided is an RL (Ref. 13, p. 135; Ref. 29). 

Samples collected from the wetland will be compared to the highest designated background level as 

shown below: 

Surface Water 

Body Matrix Hazardous 

Substance

Highest 

Background 

Concentration

(mg/kg)

Background Comparison 

Concentration = 

3 x Background or CRQL

(mg/kg)

Wetland at 12

inches bgs

Sediment 2-Methylnaphthalene

Chromium

Lead

Mercury

0.22 U

92.6

211

0.27

0.221

277.8

633

0.81

Wetland at 24 Sediment Ethylbenzene 0.0081 U 0.0081

inches bgs o-Xylene 0.0081 U 0.0081

m,p-Xylene 0.0081 U 0.0081

Isopropylbenzene 0.0081 U 0.0081

Benzo(g,h,i)perylene 0.270 U 0.270

Naphthalene 0.270 U 0.270

2-Methylnaphthalene 0.270 U 0.270

Fluorene 0.270 U 0.270

Fluoranthene 0.270 U 0.270

Phenanthrene 0.270 U 0.270

Pyrene 0.270 U 0.270

Anthracene 0.270 U 0.270

Arsenic 5.6 16.8

Cadmium 0.31 LJ 0.93

Chromium 16.3 48.9

Lead 35.6 106.8

Manganese 167.4 502.2

Mercury 0.086 LJ 0.258
SW Pathway – Likelihood of Release

HRS Documentation Record 46 Delta Shipyard

LAD058475419

Surface Water 

Body Matrix Hazardous 

Substance

Highest 

Background 

Concentration

(mg/kg)

Background Comparison 

Concentration = 

3 x Background or CRQL

(mg/kg)

Company Canal Sediment Arsenic

Lead

Chromium

Zinc

Fluoranthene

Pyrene

24.0

20.9

9.8

80.9

0.33 U

0.33 U

72

62.7

29.4

242.7

0.33

0.33

Notes: 

U Not detected at reported quantitation limit (Ref. 13, pp. 938, 1055).

CRQL = Contract Required Quantitation Limit

J Result is estimated because of outlying quality control parameters such as matrix spike, serial dilution, etc., or the result is below the CRQL (Ref. 13, 

pp. 904, 906). There is an unknown bias associated with these concentrations. 

L Reported concentration between the MDL and the CRQL (Ref. 13, p. 906). There is no bias associated with these concentrations. 1

 Since the concentration of the substance is below the CRQL, the CRQL is the background comparison concentration. (Ref. 1, Section 1.1, Table 2-

3).
SW Pathway – Likelihood of Release

HRS Documentation Record 47 Delta Shipyard

LAD058475419

Release Samples:

Samples identified as “contaminated” are those that meet observed release criteria as defined by the 

HRS (Ref. 1, Table 2-3). Observed release criteria is met when a hazardous substance attributable to a 

release from the Site has a concentration exceeding 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 Reassessment Sampling Event – August 2012 

Station Location

(Sample ID) Sample Location Sample Date (Military Time) Reference

Wetland

DSE-04

24” (MF6AA1/F6AA1) Northwest of Pit 1, within wetland 08/06/2012(0955) 

Ref. 13, pp. 111, 125, 423, 496, 

499; Ref. 16, p. 24

DSE-05

12” (MF6AG2/F6AG2) 

24” (MF6AG3/F6AG3)

North of Pit 1, within wetland 08/08/2012

(0940) 

Ref. 13, pp. 116, 126, 590, 752, 

871, 1016, 1018; Ref. 16, p. 24

DSE-05-Duplicate

24” (MF6AG7/F6AG7) North of Pit 1, within wetland 08/08/2012(0940)

Ref. 13, pp. 116, 126, 796, 929-

938, 1017, 1019; Ref. 16, p. 24

DSE-06

12” (MF6AD3/F6AD3) 

24” (MF6AD4/F6AD4)

Northeast of Pit 1, within wetland 08/07/2012

(1040) 

Ref. 13, pp. 113,125, 586-

587,748, 750; Ref. 16, p. 24

DSE-08

24” (MF6AD9/F6AD9) East of Pit 1, within wetland 08/07/2012

(1128) 

Ref. 13, pp. 114, 125, 749, 751; 

Ref. 16, p. 24

DSE-11

12” (F6AK6)

24” (MF6AK7) 

East of Pit 2, within wetland 08/09/2012

(1030) 

Ref. 13, pp. 119, 120, 686, 913, 

915, 1020, 1023; Ref. 16, p. 24

DSE-14

24” (MF6AL8) East of Pit 3, within wetland 08/09/2012(1145) 

Ref. 13, pp. 119, 120, 686, 689, 

916, 1022; Ref. 16, p. 25

Company Canal

CC-02

(CC-02-03-

612/F6AK9/MF6AK9)

Within Company Canal at PPE4 08/09/2012

(1100) 

Ref. 13, pp. 106, 107, 379, 1021; 

Ref. 16, p. 22

The release sediment samples were collected on 06 through 09 August 2012 by EPA contractors using 

the same procedures as were used to collect the background samples (Ref. 13, p. 120). Wetland 

release sediment samples were collected using a direct push technology subsurface coring device. The 

direct push cores were advanced to a depth of 8 feet bgs with samples collected at 0 to 12 inches, 1 to 

2 feet, 2 to 4 feet, 4 to 6 feet, and 6 to 8 feet. The Company Canal release sediment sample was

collected from 0 to 12 inches using a plastic disposable scoop. Once collected, sediment sample 

bottles were placed on ice until shipping (Ref. 13, pp. 4, 5). 

Sediment samples for organic analysis were shipped to the CLP contracted laboratory, Mitkem

Laboratories, located in Warnick, Rhode Island for analysis of VOCs, SVOCs, Pesticides, and PCBs. 

Sediment samples for inorganic analysis were shipped to the CLP contracted laboratory, Chem Tech, 

located in Mountainside, New Jersey, for metals analysis (Ref. 13, pp. 125-130). The samples were 

analyzed for VOCs, SVOCs, Pesticides, and PCBs by CLP SOM01.2 and for TAL metals and mercury 

by CLP ISM01.3 (Ref. 13, p. 5) 
SW Pathway – Likelihood of Release

HRS Documentation Record 48 Delta Shipyard

LAD058475419

EPA Reassessment Sampling Event – August 2012 

Sediment Samples – Wetland

Station Location

(Sample ID)

Hazardous

Substance

Concentration

mg/kg

Adjusted 

CRQL1

mg/kg

Reference

DSE-04/ 24” 

(MF6AA1) Arsenic 27.6 1.0 Ref. 13, pp. 30, 386-388, 395, 414, 423

DSE-05/ 12” 

(MF6AG2)

Chromium 431 0.99 Ref. 13, pp. 14, 764-768, 779, 790, 795

Lead 791 0.99 Ref. 13, pp. 14, 764-768, 779, 790, 795 

Mercury 1.2 0.13 Ref. 13, pp. 14, 764-768, 779, 790, 795

DSE-05/ 24” 

(F6AG3)

Naphthalene 2.0 1.2 Ref. 13, pp. 31, 929-935, 939, 975, 1016

2-Methylnaphthalene 6.2 1.2 Ref. 13, pp. 30, 929-935, 939, 975, 1016

Fluorene 1.5 1.2 Ref. 13, pp. 31, 929-935, 940, 975, 1016

DSE-05/ 24” 

(MF6AG3)

Arsenic 23.6 1.0 Ref. 13, pp. 30, 764-768, 780, 790, 795

Cadmium 5.1 J+ (3.62) 2 0.51 Ref. 13, pp. 30, 764-768, 780, 791, 795, 

798, 801-802

Chromium 584 1.0 Ref. 13, pp. 30, 764-768, 780, 791, 795 

Lead 761 1.0 Ref. 13, pp. 30, 764-768, 780, 791, 795 

Manganese 569 1.5 Ref. 13, pp. 30, 764-768, 780, 791, 795 

Mercury 2.0 0.12 Ref. 13, pp. 30, 764-768, 780, 791, 795 

DSE-05/ 24” 

Duplicate (F6AG7)

Ethylbenzene 1.8 0.45 Ref. 13 pp. 43, 929-935, 952, 959, 1019 

o-Xylene 3.9 0.45 Ref. 13 pp. 43, 929-935, 952, 959, 1019 

m,p-Xylene 9.7 0.45 Ref. 13 pp. 43, 929-935, 952, 959, 1019 

Isopropylbenzene 0.8 0.45 Ref. 13 pp. 43, 929-935, 952, 959, 1019 

Naphthalene 130 J1 59.0 Ref. 13 pp. 43, 929-935, 950, 983, 1017 

2-Methylnaphthalene 400 J1 59.0 Ref. 13 pp. 42, 929-935, 950, 983, 1017 

Fluorene 45.0 J1 5.9 Ref. 13 pp. 43, 929-935, 951, 982, 1017 

Phenanthrene 58.0 J1 5.9 Ref. 13 pp. 43, 929-935, 951, 983, 1017 

Anthracene 7.2 J1 5.9 Ref. 13 pp. 42, 929-935, 951, 983, 1017 

DSE-05/ 24” 

Duplicate (MF6AG7)

Arsenic 37.4 1.0 Ref. 13, pp. 42, 764-768, 784, 792, 796 

Cadmium 8.5 J+ (6.03) 2 0.50 Ref. 13, pp. 42, 764-768, 784, 792, 796, 

798, 801-802

Chromium 337 1.0 Ref. 13, pp. 42, 764-768, 784, 792, 796

Lead 1,030 1.0 Ref. 13, pp. 42, 764-768, 784, 792, 796 

Manganese 866 1.5 Ref. 13, pp. 42, 764-768, 784, 792, 796

DSE-06/ 12”

(MF6AD3) Mercury 0.84 0.11 Ref. 13, pp. 14, 710-717, 726, 742, 750

DSE-06/ 24” 

(F6AD4)

Benzo(g,h,i)perylene 0.32 0.21 Ref. 13, pp. 31, 506-510, 515, 548, 587

Fluoranthene 0.37 0.21 Ref. 13, pp. 31, 506-510, 515, 548, 587

Phenanthrene 0.28 0.21 Ref. 13, pp. 31, 506-510, 515, 548, 587

Pyrene 0.38 0.21 Ref. 13, pp. 31, 506-510, 515, 548, 587

DSE-06/ 24”

(MF6AD4)

Cadmium 1.6 0.45 Ref. 13, pp. 30, 710-717, 727, 742, 750

Lead 258 0.91 Ref. 13, pp. 30, 710-717, 727, 742, 750

DSE-08/ 24” 

(MF6AD9)

Arsenic 19.3 J 0.92 Ref. 13, pp. 30, 710-717, 732, 744, 751

Lead 162 0.92 Ref. 13, pp. 30, 710-717, 732, 744, 751

DSE-11/ 12”

(F6AK6) 2-Methylnaphthalene 0.39 0.23 Ref. 13, pp. 16, 930-938, 947, 985, 1020

DSE-11/ 24” 

(MF6AK7)

Arsenic 17.5 1.0 Ref. 13, pp. 32, 899-906, 907, 915 

Manganese 1,910 J 1.5 Ref. 13, pp. 32, 899-906, 907, 915
SW Pathway – Likelihood of Release

HRS Documentation Record 49 Delta Shipyard

LAD058475419

Station Location

(Sample ID)

Hazardous

Substance

Concentration

mg/kg

Adjusted 

CRQL1

mg/kg

Reference

DSE-14/ 24” (MF6AL8) Manganese 578 J 1.7 Ref. 13, pp. 32, 900-906, 909, 916 

Notes:

1

 The Adjusted Contract Required Quantitation Limit (CRQL) terminology used by the CLP Laboratory are quantitation limits that have been adjusted 

for sample aliquot, sample volume, and dilutions for the analysis (Ref. 1, Section 1.1, Table 2-3; Ref. 29). 2

 Values that have been adjusted according to the EPA Fact Sheet (Reference 17) are listed in parentheses.

J Result is estimated because of outlying quality control parameters (Ref. 13, pp. 717, 906). There is no bias associated with these concentrations.

J

1

 Estimated value (Ref. 13, p. 938). Low biased based on analysis outside holding time (Ref. 13, pp. 929-935).

J+ Result is estimated because of outlying quality control parameters. High biased (Ref. 13, p. 771).

EPA Reassessment Sampling Event – August 2012 

Sediment Samples – Company Canal 

Station Location

(Sample ID)

Hazardous

Substance

Concentration

mg/kg

Quantitation 

Limit1

mg/kg

Reference

CC-02-03-612

(MF6AK9/F6AK9)

Lead 89.6 2.43 Ref. 13, pp. 132-135, 297, 379

Chromium 105 2.43 Ref. 13, pp. 132-135, 297, 379

Zinc 567 4.73 Ref. 13, pp. 132-135, 297, 379

Fluoranthene 0.480 0.4102 Ref. 13, pp. 1048-1052, 1059, 1094, 

1112

Pyrene 0.420 0.4102 Ref. 13, pp. 1048-1052, 1059, 1094, 

1112 

Notes:

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

1 The Reporting Limit (RL) terminology used by the EPA Region 6 Laboratory and the Adjusted Contract Required Quantitation Limit (CRQL) 

terminology used by the CLP Laboratory are quantitation limits that have been adjusted for sample aliquot, sample volume, and dilutions for the 

analysis (Ref. 1, Section 1.1, Table 2-3; Ref. 13, pp. 134-135; Ref. 29). 2 Quantitation limit provided is an adjusted CRQL (Ref. 13, p. 1054; Ref. 29). 3

 Quantitation limit provided is an RL (Ref. 13, p. 135; Ref. 29). 

Attribution:

Since there is analytical evidence that some of the sediment samples collected from the Site contain 

hazardous substance concentrations above their background levels, the sampling conducted at the Site 

in 2012 further supports observed release by chemical analysis and attribution to the site. 

The background samples collected at the Site are deemed appropriate background samples for the 

purposes of evaluating the Site under the HRS because the analytical results from the background 

samples are indicative of the highly industrialized area in which the Site is located because the samples 

were collected in the general vicinity of the Site (Appendix A, Figure A-5). Samples having 

concentrations that are three times greater than the highest background concentration of a particular 

analyte were collected 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 

from the surface water pathway meeting observed release criteria (Sections 2.4.1 and 4.1.2.1.1). 

Downgradient sites were not evaluated as contributing to background contamination levels. Although 

the surface water pathway includes water bodies that are seasonally tidally influenced, there is no 

documentation to indicate that there is tidal carry from other possible downgradient sources. 
SW Pathway – Likelihood of Release

HRS Documentation Record 50 Delta Shipyard

LAD058475419

The Site is located approximately 50 stream miles from the Gulf Coast and is along a freshwater river; 

therefore only minimal elevation changes due to tidal influence are expected to occur (Ref. 3, pp. 1-3; 

Ref. 21 pp. 8, 13). 

A search of the Toxic Release Inventory (TRI) and EPA EnviroMapper and Envirofacts databases was

performed within the zip code of the Site location. The facilities identified upgradient along Company 

Canal, Houma Navigation Canal, and Bayou LaCarpe included: Apache Louisiana Minerals a crude oil 

petroleum facility; Elevating Boats LLC, a boat building and repair facility that uses volatile organic 

compounds; Performance Energy Services LLC, a metal coating and allied facility that uses zinc; 

Preferred Sandblasting LLC, a metal coating and allied facility that uses volatile organic compounds; 

and D&S Chemical Company (Ref. 22, pp. 1-11). No nearby facilities along the surface water pathway 

are reported to have had a release of arsenic, antimony, anthracene, benzene, cadmium, chromium, 

ethylbenzene, fluorene, lead, manganese, mercury, 2-methylnaphthalene, naphthalene, phenanthrene, 

pyrene, o-xylene, and m,p-xylene according to the TRI database (Ref. 23, p. 1). 

Likelihood of Release Factor:

Observed releases have been established through direct observation and chemical analysis. Based on 

the analytical data and attribution components listed above, arsenic, antimony, anthracene, benzene, 

cadmium, chromium, ethylbenzene, fluorene, lead, manganese, mercury, 2-methylnaphthalene, 

naphthalene, phenanthrene, pyrene, o-xylene, and m,p-xylene have been documented as the hazardous 

substances in the observed release to the contiguous wetland. Therefore, the observed release factor 

value of 550 was assigned for the surface water pathway (Ref. 1, Section 4.1.2.1.1). 

Likelihood of Release Factor Value: 550 
SW Pathway – Potential to Release

HRS Documentation Record 51 Delta Shipyard

LAD058475419

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 observed releases to surface water have been 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

HRS Documentation Record 52 Delta Shipyard

LAD058475419

4.1.3 HUMAN FOOD CHAIN THREAT 

4.1.3.2 WASTE CHARACTERISTICS

Evidence of contamination associated with Source 1-4 is established based on direct observation and 

chemical analyses of samples collected from the source (refer to the Attribution section and Section 

2.2 for Source 1, 2, 3 and 4). Arsenic, anthracene, cadmium, chromium, ethylbenzene, fluorene, lead, 

manganese, mercury, 2-methylnaphthalene, naphthalene, phenanthrene, pyrene, o-xylene, and m,pxylene were detected in sediment samples collected in the surface water pathway, thus establishing an 

observed release (see Section 4.1.2.1.1). 

4.1.3.2.1 Toxicity/Persistence/Bioaccumulation

The substances with the highest combined values are cadmium and mercury as shown below. 

Hazardous

Substance

Source 

Number

Toxicity 

Factor

Value

Persistence

Factor Value1

Bioaccumulation 

Factor Value

Fresh Water2

Toxicity/

Persistence/

Bioaccumulation 

Factor Value Reference

Anthracene 1,2,3,OR 10 0.4 50,000 2 x 105 Ref. 2, p. 9 

Antimony 1,2,OR 10,000 1 5 5 x 104 Ref. 2, p. 9 

Arsenic 1,2,3,4,OR 10,000 1 5 5 x 104 Ref. 2, p. 9 

Benzene 1,2,OR 1,000 0.4 5,000 2 x 106 Ref. 2, p. 10

Cadmium 1,2,3,4,OR 10,000 1 50,000 5 x 108 Ref. 2, p. 10

Chromium 1,2,3,4,OR 10,000 1 5 5 x 104 Ref. 2, p. 11

Ethylbenzene 1,2,3,OR 10 0.4 50 2 x 102 Ref. 2, p. 13

Fluorene 1,2,3,4,OR 100 0.4 500 2 x 104 Ref. 2, p. 13

Lead 1,2,3,4,OR 10,000 1 5,000 5 x 107 Ref. 2, p. 15

Manganese 1,2,3,4,OR 10,000 1 500 5 x 106 Ref. 2, p. 15

Mercury 1,2,3,4,OR 10,000 1 50,000 5 x 108 Ref. 2, p. 15

2-Methylnaphthalene

1,2,3,4,OR 1,000 0.4 50,000 2 x 107 Ref. 2, p. 15

Naphthalene 1,2,3,4,OR 1,000 0.4 50,000 2 x 107 Ref. 2, p. 15

Phenanthrene 1,2,3,4,OR 1 0.4 5,000 2 x 103 Ref. 2, p. 16

Pyrene 1,2,3,OR 100 1 50,000 5 x 106 Ref. 2, p. 16

o-Xylene 1,2,3,OR 100 0.4 50 2 x 103 Ref. 2, p. 18

m-Xylene 1,2,3,OR 100 0.4 500 2 x 104 Ref. 2, p. 18

p-Xylene 1,2,3,OR 100 0.4 50 2 x 103 Ref. 2, p. 18

Zinc 1,2,3,4,OR 10 1 500 5 x 103 Ref. 2, p. 18

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, Sect. 4.1.2.2.1.2). The persistence values were assigned for a river according to HRS 

Section 4.1.3.2.1.2. 2

 Bioaccumulation factor values are assigned from the SCDM (Ref. 2), for water body type "Fresh Water" in which the fisheries are 

located (Ref. 1, Sect. 4.1.3.2.1.3). 

Toxicity/Persistence/Bioaccumulation Factor Value: 5 x 108
SW Pathway – Human Food Chain Threat

HRS Documentation Record 53 Delta Shipyard

LAD058475419

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 1,826.923 NE 10 NE NE

2 2,067.307 NE 10 NE NE

3 2,711.538 NE 10 NE NE

4 >0, but unknown NE 10 NE NE

TOTAL >6,605.768 NE 10 NE NE

 NE = Not Evaluated

A hazardous waste quantity of 6,605.781 is estimated for the sources at the Delta Shipyard Site, which

when applied in HRS Table 2-6, yields a pathway hazardous waste quantity of 100. 

Hazardous Waste Quantity Factor Value = 100 

4.1.3.2.3 Waste Characteristics Factor Category Value

Toxicity/Persistence Factor Value: 10,000 Hazardous Waste Quantity Factor Value: 100 

Bioaccumulation Potential Factor Value: 50,000 

10,000 (Toxicity/Persistence Factor Value) x 100 (Hazardous Waste Quantity Factor Value) = 1 x 

106(maximum of 1 x 108 according to HRS Section 4.1.3.2.3) 

1 x 106

(Toxicity/Persistence Factor Value x Hazardous Waste Quantity Factor Value) x 50,000

(Bioaccumulation Potential Factor Value) = 5 x 1010 (maximum of 1 x 1012 according to HRS Section 

4.1.3.2.3) 

A hazardous waste quantity factor of 100 is assigned according to HRS Section 2.4.2.2. From 

Reference 2 and Table 4-12 of the HRS (i.e., Reference 1), cadmium and mercury have a 

toxicity/persistence value of 10,000 and a bioaccumulation potential factor of 50,000. The waste 

characteristics factor category value from Reference 1, Table 2-7 for a waste characteristics product of 

5 x 1010 is 320. 

Hazardous Waste Quantity Assigned Value: 100 

Waste Characteristics Factor Category Value: 320 
SW Pathway – Human Food Chain Threat

HRS Documentation Record 54 Delta Shipyard

LAD058475419

4.1.3.3 TARGETS

4.1.3.3.1 Food Chain Individual

Fishing is documented within the TDL (Ref. 27, p. 1; Ref. 28, p. 1). The area of the confluence of 

Bayou LaCarpe and the Houma Navigation Canal, on the south end of Houma, is fished for freshwater 

fish including catfish and carpe. These fish are used for personal consumption (Ref. 27, p. 1; Ref. 28, 

p. 1). 

Fishery Type of Surface Water Body Reference(s)

Company Canal (Houma 

Navigation Canal)

Large Stream to River Ref. 26; Ref. 28

Observed releases 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). 

This information documents an observed release of several hazardous substances having a 

bioaccumulation factor of 500 or greater to surface water (the wetland and the Company Canal) in the 

watershed (See Section 4.1.3.2.1 of this HRS documentation record). There is also a fishery present 

within the TDL; therefore a food chain individual value of 20 was assigned (Ref. 1, Section 4.1.3.3.1).

Food Chain Individual Factor Value: 20

4.1.3.3.2 Population

4.1.3.3.1.1 Level I Concentrations

Level I concentrations have not been established; therefore, the Level I concentrations factor value 

receives an assigned value of 0. 

Level I Concentration Factor Value: 0 

4.1.3.3.1.2 Level II Concentrations

Level II concentrations have not been established; therefore, the Level II concentrations factor value 

receives an assigned value of 0. 

Level I Concentration Factor Value: 0 
SW Pathway – Human Food Chain Threat

HRS Documentation Record 55 Delta Shipyard

LAD058475419

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

Company Canal 

(Houma 

Navigation 

Canal)

>0, but 

unknown

Large Stream to 

River

3,525 cfs Ref. 1, Tables 4-13, 

4-18; Ref. 26, p. 1

0.03 0.001 0.00003

Notes: 

cfs = cubic feet per second.

Bayou LaCarpe and the Houma Navigation Canal are fished for catfish and carpe according to the

Louisiana Department of Wildlife and Fisheries; these fish are caught for human consumption (Ref. 

27; Ref. 28). Data to estimate pounds of fish caught annually from Bayou LaCarpe and the Houma 

Navigation Canal 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 (Ref. 1, Table 4-18). For Houma Navigation Canal, which 

encompasses the majority of the TDL, the dilution weight was based on the average annual flow data 

collected by the USGS at a gauging station located at Dulac, Louisiana (Ref. 26, p. 1). Based on the 

stream flow, Houma Navigation Canal, according to Table 4-13 of the HRS, is classified as a large 

stream to river and receives an assigned dilution weight of 0.001 (Ref. 1, Table 4-13). 

Houma Navigation Canal - Product of Pi x Di = 0.03 x 0.001 

Product of Pi x Di: 0.00003 

(Sum of Products of Pi x Di)/10: 0.000003
SW Pathway – Environmental Threat

HRS Documentation Record Delta Shipyard

 LAD058475419

56

4.1.4 ENVIRONMENTAL THREAT 

4.1.4.2 WASTE CHARACTERISTICS

Evidence of contamination associated with Source 1, 2, 3 and 4 have been established based on direct 

observation and chemical analyses of samples collected from this source (refer to the Attribution 

section and Sections 2.2 for Source 1, 2, 3 and 4 of this HRS documentation record). 

4.1.4.2.1 Ecosystem Toxicity/Persistence/Bioaccumulation

The substances with the highest combined values are mercury, cadmium and pyrene as shown below. 

Hazardous

Substance

Source 

Number

Ecotoxicity 

Factor

Value

Fresh2

Persistence1

Factor 

Value

Ecosystem

Bioaccumulation 

Potential Factor 

Value

Fresh Water2

Ecotoxicity/

Persistence/

Bioaccumulation 

Factor Value Reference

Anthracene 1,2,3,OR 10,000 0.4 50,000 2 x 108 Ref. 2, p. 9 

Antimony 1,2,OR 1 1 5 5 Ref. 2, p. 9 

Arsenic 1,2,3,4,OR 10 1 50,000 5 x 105 Ref. 2, p. 9 

Benzene 1,2,OR 1,000 0.4 5,000 2 x 106 Ref. 2, p. 10

Cadmium 1,2,3,4,OR 10,000 1 50,000 5 x 108 Ref. 2, p. 10

Chromium 1,2,3,4,OR 10,000 1 500 5 x 106 Ref. 2, p. 11

Ethylbenzene 1,2,3,OR 100 0.4 50 2 x 103 Ref. 2, p. 13 

Fluorene 1,2,3,4,OR 1,000 0.4 5,000 2 x 106 Ref. 2, p. 13 

Lead 1,2,3,4,OR 1,000 1 50,000 5 x 107 Ref. 2, p. 15 

Manganese 1,2,3,4,OR 100 1 50,000 5 x 106 Ref. 2, p. 15 

Mercury 1,2,3,4,OR 10,000 1 50,000 5 x 108 Ref. 2, p. 15 

2-Methylnaphthalene

1,2,3,4,OR 100 0.4 50,000 2 x 106 Ref. 2, p. 15 

Naphthalene 1,2,3,4,OR 1,000 0.4 50,000 2 x 107 Ref. 2, p. 15 

Phenanthrene 1,2,3,4,OR 10,000 0.4 50,000 2 x 108 Ref. 2, p. 16 

Pyrene 1,2,3,OR 10,000 1 50,000 5 x 108 Ref. 2, p. 16 

o-Xylene 1,2,3,OR 100 0.4 50 2 x 103 Ref. 2, p. 18 

m-Xylene 1,2,3,OR 100 0.4 500 2 x 104 Ref. 2, p. 18 

p-Xylene 1,2,3,OR 100 0.4 50 2 x 103 Ref. 2, p. 18

Zinc 1,2,3,4,OR 10 1 50,000 5 x 105 Ref. 2, p. 18 

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 were assigned for a river according to the HRS (Ref. 1, Sect. 

4.1.2.2.1.2). 2

 Bioaccumulation factor values are assigned from the SCDM (Ref. 2), for "Fresh Water" in which the wetlands are located (Ref. 14, p. 1, Ref. 

21, p. 13). The data that yielded the higher factor value was assigned to the Bioaccumulation Factor Value of the hazardous substance (Ref. 

1, Sect. 4.1.3.2.1.3).

Toxicity/Persistence/Bioaccumulation Factor Value: 5 x 108
SW Pathway – Environmental Threat

HRS Documentation Record Delta Shipyard

 LAD058475419

57

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 1,826.923 NE 10 NE NE

2 2,067.307 NE 10 NE NE

3 2,711.538 NE 10 NE NE

4 >0, but unknown NE 10 NE NE

TOTAL 6,605.768 NE 10 NE NE

 NE = Not Evaluated

A hazardous waste quantity of 6,605.768 is estimated for sources at the Delta Shipyard Site which 

when applied in HRS Table 2-6, yields a pathway hazardous waste quantity of 100. 

Hazardous Waste Quantity Factor Value = 100 

4.1.4.2.3 Waste Characteristics Factor Category Value

Ecotoxicity/Persistence Factor Value: 10,000

Hazardous Waste Quantity Factor Value: 100 

Ecosystem Bioaccumulation Potential Factor Value: 50,000 

10,000 (Ecotoxicity/Persistence Factor Value) x 100 (Hazardous Waste Quantity Factor Value) = 1 x 

106 (maximum of 1 x 108 according to HRS Section 4.1.4.2.3) 

1 x 106

 (Ecotoxicity/Persistence Factor Value x Hazardous Waste Quantity Factor Value) x 50,000 

(Bioaccumulation Potential Factor Value) = 5 x 1010 (maximum of 1 x 1012 according to HRS Section 

4.1.4.2.3) 

A hazardous waste quantity factor of 100 is assigned according to HRS Section 2.4.2.2. From 

Reference 2 and Table 4-20 of the HRS, mercury, cadmium and pyrene have an ecotoxicity/persistence 

value of 10,000 and an ecosystem bioaccumulation potential factor of 50,000. The waste 

characteristics factor category value from Reference 1, Table 2-7 for a waste characteristics product of 

5 x 1010 is 320. 

Hazardous Waste Quantity Assigned Value: 100 

Waste Characteristics Factor Category Value: 320 
SW Pathway – Environmental Threat

HRS Documentation Record Delta Shipyard

 LAD058475419

58

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 

determined to be affected by Level II concentrations was measured two different ways for direct 

observation and for chemical analysis. The highest calculated perimeter is 3,500 linear feet (Ref. 14, 

pp. 1, 9; Ref. 24, pp. 1-3). The total length of wetlands 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 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 information presented in a National Wetlands Inventory (NWI) Map of the area, updated 

in September 2012, the wetland with Level II contamination is classified as PSS1S (Ref. 14, pp. 1-3, 

9). These wetlands meet the HRS definition of a wetland. 

Total Level II Wetland Perimeter = 3,500 feet 

5,280 feet = 1 mile 

3,500 feet/5,280 feet = 0.662 miles

Wetland Value (Ref. 1, Table 4-24): 25 

Level II Concentrations Factor Value: 25 
SW Pathway – Environmental Threat

HRS Documentation Record Delta Shipyard

LAD058475419

59

4.1.4.3.1.3 Potential Contamination

Wetlands

Palustrine forested wetlands are located along a large portion of the surface water pathway’s 15-mile 

TDL that are susceptible to potential contamination (Ref. 14, pp. 4, 9). The total length of wetlands 

was determined in accordance with Sections 4.1.4.3.1.3 of the HRS (Ref. 1) and was calculated by 

measuring the frontage of the wetland along each bank of the surface water pathway subject to 

potential contamination within the TDL (Ref. 1, Sections 4.1.4.3.1.3; Ref. 25, pp. 1-2).

According to the NWI Map of the area, updated in September 2012, the wetlands with potential

contamination is classified as Palustrine System, Forested (Ref. 14, pp. 1-3, 9). These wetlands meet 

the HRS definition of a wetland.

Total Potential Wetland Frontage = 21.7 miles

Wetland Value (Ref. 1, Table 4-24): 500

The potential wetlands are located along the Houma Navigation Canal. The Houma Navigation Canal

has an average flow of 3,525 cubic feet per second according to the USGS (Ref. 26. p. 1). This would 

categorize the canal as a large stream to river according to HRS (Ref. 1, Table 4-13). Potential 

contamination was calculated according to HRS, Section 4.1.4.3.1.3. 

Houma Navigation Canal Dilution Weight = 0.001

Product of Wetland Value x Dilutions Weight = 500 x 0.001 = 0.5

0.5/10=0.05

Potential Contamination Factor Value: 0.05
HRS Documentation Record Delta Shipyard

LAD058475419

60

Attachment A
!(

SITE LOCATION

FIGURE A-1

SITE LOCATION MAP

DELTA SHIPYARD

200 DEAN COURT, HOUMA

TERREBONNE PARISH, LOUISIANA $

0 2,000 4,000

SCALE IN FEET

LEGEND

!( SITE LOCATION

20406.012.019.0680.01 AS SHOWN

SOURCE: 2011 National Geographic Society, i-cubed

(USGS 7.5 minute Houma Topographic Quadrangle)

TDD NO: TO-0019-11-10-01

EPA ID NO: LAD058475419

FILE: L:\20406_START3_R6\DeltaShipyard\GIS\Maps\Figure A-1 Site Location Map.mxd 10:29:46 AM 5/13/2014 bondp

MAY, 2014

DATE PROJECT NO SCALE

"

LOUISIANA

US EPA REGION 6

REF. 3, P.1
Residential Property

PIT 4

PIT1

PIT 2

PIT 3

PPE1

PPE2

PPE3

PPE4

Source: Esri, DigitalGlobe, GeoEye, i-cubed, USDA, USGS, AEX, Getmapping, Aerogrid, IGN, IGP, swisstopo, and the GIS User Community

FIGURE A-2

PROPERTY LAYOUT MAP

DELTA SHIPYARD 

200 DEAN COURT, HOUMA,

TERREBONNE PARISH, LOUISIANA

0 87.5 175

Feet

TDD NO: TO-0019-11-10-01

EPA ID NO: LAD058475419

Image Source:

ESRI World Imagery

LEGEND

Probable Point of Entry

Drainage Ditch

Surface Water Flow Direction

Pits

Facility Boundary

20406.012.019.0680.01 AS SHOWN

10:25:48 AM 4/3/2014 FILE: L:\20406_START3_R6\DeltaShipyard\GIS\Maps\Figure A-2 Property Layout Map.mxd 10:25:48 AM 4/3/2014 herrinm

APRIL, 2014

DATE PROJECT NO SCALE

US EPA REGION 6

LOUISIANA

REF. 12, P. 30; REF. 13, PP. 2-10; REF. 30, P. 4
!(

#*

#*

#*

#*

Houma Navigational Canal

Bayou La Carpe

Company Canal

Documented Fishing Area

PIT 4

PIT1

PIT 2

PIT 3

CC-01

PPE1

PPE2

PPE3

PPE4

FIGURE A-3

SURFACE WATER PATHWAY MAP

DELTA SHIPYARD

200 DEAN COURT, HOUMA,

TERREBONNE PARISH, LOUISIANA

$ 0 425 850

Feet

TDD NO: TO-0019-11-10-01

EPA ID NO: LAD058475419

Image Source:

ESRI World Imagery

Wetland Source:

US Fish and Wildlife Service (National Wetlands Inventory)

LEGEND

!( Background Sample Location

*# Probable Point of Entry

Perennial Drainage Ditch

Surface Water Flow Direction

Pits

Level II Wetlands

20406.012.019.0680.01 AS SHOWN

2:58:16 PM 5/13/2014 FILE: L:\20406_START3_R6\DeltaShipyard\GIS\Maps\Figure A-3 Surface Water Pathway Map.mxd 2:58:16 PM 5/13/2014 bondp

MAY, 2014

DATE PROJECT NO SCALE

US EPA REGION 6

"

LOUISIANA

Freshwater Pond

Riverine

Freshwater Forested/Shrub Wetland

Freshwater Emergent Wetland

Wetlands

REF. 13, PP. 11,REF. 14, PP. 1,9; REF. 19, PP. 1-2; REF. 27; REF. 28
15-Mile TDL

Source: Esri, DigitalGlobe, GeoEye, i-cubed, USDA, USGS, AEX, Getmapping, Aerogrid, IGN, IGP, swisstopo, and the GIS User Community

FIGURE A-4

15-MILE TARGET DISTANCE LIMIT MAP

DELTA SHIPYARD 

200 DEAN COURT, HOUMA,

TERREBONNE PARISH, LOUISIANA

0 1 2

Miles

TDD NO: TO-0019-11-10-01

EPA ID NO: LAD058475419

Image Source:

(c) 2009 Microsoft Corporation and its data suppliers, 2011

Wetland Source:

US Fish and Wildlife Service (National Wetlands Inventory)

LEGEND

15 Mile TDL

Site Location

20406.012.019.0680.01 AS SHOWN

4:18:45 PM 4/2/2014 FILE: L:\20406_START3_R6\DeltaShipyard\GIS\Maps\Figure A-4 Target Distance Limit Map.mxd 4:18:45 PM 4/2/2014 herrinm

FEBRUARY, 2014

DATE PROJECT NO SCALE

US EPA REGION 6

LOUISIANA

Wetlands

Freshwater Pond

Riverine

Freshwater Forested/Shrub Wetland

Freshwater Emergent Wetland

Lake

Estuarine and Marine Wetland

REF. 3, PP. 1-3; REF. 14, PP. 1, 9; REF. 27; REF. 28

Documented Fishing Area

Bayou LaCarpe Company Canal

Houma Navagation Canal
PIT1

PIT 2

PIT 3

DSE-07 DSE-01

DSE-10

DSE-13

DSE-02

DSE-03

DSE-16

D01

D02

D03

D04

P01

P02

P03

P04

P05

P06

DSE-04

DSE-06 DSE-05

DSE-08

DSE-11

CC-02

DSE-14

DSE-17

DSE-20

DSE-18

DSE-21

PPE1

PPE2

PPE3

PPE4

Source: Esri, DigitalGlobe, GeoEye, i-cubed, USDA, USGS, AEX, Getmapping, Aerogrid, IGN, IGP, swisstopo, and the GIS User Community

FIGURE A-5

SAMPLE LOCATION MAP

DELTA SHIPYARD 

200 DEAN COURT, HOUMA,

TERREBONNE PARISH, LOUISIANA

0 87.5 175

Feet

TDD NO: TO-0019-11-10-01

EPA ID NO: LAD058475419

Image Source:

ESRI World Imagery

LEGEND

Probable Point of Entry

Background Sediment Sample

Characterization Sample

Level II Sediment Sample

Source Characterization Sample

Drainage Ditch

Surface Water Flow Direction

Pits

Level II Wetlands

20406.012.019.0680.01 AS SHOWN

4:24:52 PM 4/2/2014 FILE: L:\20406_START3_R6\DeltaShipyard\GIS\Maps\Figure A-5 Sample Location Map.mxd 4:24:52 PM 4/2/2014 herrinm

APRIL, 2014

DATE PROJECT NO SCALE

US EPA REGION 6

LOUISIANA

Wetlands

Freshwater Pond

Riverine

Freshwater Forested/Shrub Wetland

REF. 14, PP. 1, 9; REF. 19, PP. 1-2; REF. 12, P. 30

Note: Locations of samples collected in 1996 

are approximations only. The locations shown in 

Reference 12 are not to scale.