### 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, e valuation 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 exposur e 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 l isting decision (Ref. 1, Sec. 2.2.3).

HRS Documentation Record Delta Shipyard
LAD058475419HRS Documentation Record 

### 1 Delta Shipyard
LAD058475419 

### 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 south ern 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 (19 98 ) (Ref. 3, p. 1).

Latitude/Longitude *: 29° 33 ’ 56.9448 ” N, 9 0° 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 d ocumentation r ecord 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 re leases" 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, H RS 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.HRS Documentation Record 

### 2 Delta Shipyard
LAD058475419 

### 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 numb er (e.g., Reference 4, page 1 is expressed as 040001 in 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 MapHRS Documentation Record 

### 3 Delta Shipyard
LAD058475419 

### 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 Surve y (USGS) Topographic Maps

. 1998. Houma, Louisiana ; 199 4, Dulac

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

4. Weston Solutions, Inc

. (WESTON ® 

### ). 201 3 . 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. W ESTON . 201 2. Site Visit Photographs. Delta Shipyard, Houma, Louisiana

. 10 January
2012. Pages: 12

.

8. L ouisiana Department of Natural Resources (LDNR). 1983. Notice of Violation Letter

. Delta Shipyard . 20 May 1983 . Pages: 2.

9. W ink Engineering

. 1985

. Letter s 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. L ouisiana 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. EP A

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

. December 1996

. Pages: 560.

13. EP A . 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 We tland 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.

HRS Documentation Record 

### 4 Delta Shipyard
LAD058475419HRS Documentation Record 

### 5 Delta Shipyard
LAD058475419 

### 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
LAD058475419 

### SITE SUMMARY

The site being evaluated i ncludes 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 c ity 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 Chro malloy 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 o ily waste from the cleaning process was stored in several unlined earthen pits used as evaporation ponds (Ref. 5, p. 3). These pits were reporte dly also used to dispose of oil- field drilling material (Re f. 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 th em and have a crusty layer on the surface. The ir 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 appe ars to be a dried oil/petroleum

- type waste (Ref. 7, pp. 1, 3, 5, 6 ). The backfilled pit area contain s vegetation
and trash and is differentiated from the surrounding land as mounds within a relatively flat topographic

area . The closest residential property is loc ated 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 s ite includes the three open pits (Source s 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 C anal

. 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 S ite since the early 1980s. Investigations that have been conducted in the vicinity of the open pits encompassing the current Site
are descri bed in the following paragraphs:HRS Documentation Record 

### 7 Delta Shipyard
LAD058475419 

### • 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 facili ty was having their waste treated, stored, or disposed of at a permitted haza rdous waste facility, and the facility has not developed and adhered to a ground wa ter 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, ethylbenzen e , 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 backgrou nd 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 ana lyzed for volatiles, metals, a nd polychlorinated bi

phenyls ( 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
Prioritiza tion (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 drainag e 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 in cluded benzene, ethylbenzene, xylenes, 2- methylnaphthalene, polycyclic aromatic hydrocarbons (PAH s ), 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 s ludge 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).HRS Documentation Record 

### 8 Delta Shipyard
LAD058475419 

### WORKSHEET FOR COMPUTING HRS SITE SCORE

S S 2



### 1. Ground Water Migration Pathway Score (S gw 

### ) 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 (S sw 

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

3. Soil Exposure Pathway Score (S
s 

### ) NS NS (from Table 5 -1, line 22)

4. Air Migration Pathway Score (S
a 

### ) NS NS (from Table 6 -1, line 12)

5. Total of S gw 2 

### + S sw 2 

### + S s 2 

### + S a 2



### ---- 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
S 2 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 t he following pages of this HRS Documentation R ecord for the convenience of the reader.HRS Documentation Record 

### 9 Delta Shipyard
LAD058475419 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 Q uantity, 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 NSHRS Documentation Record 

### 10 Delta Shipyard
LAD058475419 H UMAN 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 5x10 8

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. 0 00 003
19d. Population (lines 19a + 19b + 19c) b 0. 0000 03

20. Targets (lines 18 + 19d) b 20. 0 00 0 03

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 .666HRS Documentation Record 

### 11 Delta Shipyard
LAD058475419 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 5x10 8

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 96.106Source Characterization

– Source 1

HRS Documentation Record 

### 12 Delta Shipyard
LAD058475419 

### 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 reporte dly also used to dispose of oil

- field drilling material (Re f . 9, p. 4). Currently, the open pit is uncovered and lack s 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 t he pit is black and appe ars 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 pi ts by a berm, t he 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 th e 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 an d a s the photo logs from the S ite 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 )

. T he berms are not maintained
and contain heavy vegetation (R ef. 7, pp. 1, 3, 4, 6, 9, 11; Ref. 12, pp. 96

- 99 ; Ref. 20, pp. 1

- 6, 10

- 13 )

. In addition, Sour ce 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

HRS Documentation Record 

### 13 Delta Shipyard
LAD058475419 

### 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 ( VO As ), 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 S ite from 06 through 10 August 2012, EPA

contractors collected six waste sample s from various depths from Pit 1 ( Attachment A, Figure A

- 5,
Ref. 13 , p . 126). The samples w ere a nalyzed 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 th e EPA Region 6 Environmental Services Branch Laboratory , located in Houston, Texas (Ref. 13, p. 5).

A nalytical evidence of the contamination in waste source samples associated with Source 1 located on
the Delta Shipyard S ite is summarized below

.

Evidence
Hazardous
Substance References Sample ID Concentration (mg/ kg ) Quantitation
Limit 1
(mg/ kg )

ESI Sampling Activities

– July 1996

Ethylbenz e ne

P01

- 71 -1 /
G42512 8.7 2.3 2 Ref. 6, p. 15; Ref.12, pp. 42, 227
Xylenes 27.0 2.3 2 Ref. 6, p. 15; Ref.12, pp. 42, 227

2- Methylnaphalene 390 120 2 Ref. 6, p. 15; Ref.12, pp. 42, 272
Naphthalene 130 120 2 Ref. 6, p. 15; Ref.12, pp. 42, 272Source Characterization

– Source 1

HRS Documentation Record 

### 14 Delta Shipyard
LAD058475419 Hazardous
Substance Evidence
References Sample ID Concentration (mg/ kg ) Quantitation
Limit 1
(mg/ kg )

Endosulfan II 0.0 66 0.03 2 Ref. 6, p. 15; Ref.12, pp. 42, 300

Hep t achlor epoxide 0.110 0.03 2 Ref. 6, p. 15; Ref.12, pp. 42, 300

Arsenic 26.1 1.19 3 Ref. 6, p. 15; Ref.12, pp. 42, 12 6, 406

Cadmium 5.6 0.5 5 3 Ref. 6, p. 15; Ref.12, pp. 42, 126

Chromium 709 1.09 3 Ref. 6, p. 15; Ref.12, pp. 42, 126

Lead 861 0.0 55 3 Ref. 6, p. 15; Ref.12, pp. 42, 126

Mercury 1.8 0 .055 3 Ref. 6, p. 15; Ref.12, pp. 42, 126

Zinc 1,010 2.19 3 Ref. 6, p. 15; Ref.12, pp. 42, 126

Ethylbenzene

P02

- 71

- 1/
G42513 3.5 2.1 2 Ref. 6, p. 14; Ref.12, pp. 42, 229
Xylenes 23 2.1 2 Ref. 6, p. 14; Ref.12, pp. 42, 229

2- Methylnaphalene 460 110 2 Ref. 6, p. 14; Ref.12, pp. 42, 275
Naphthalene 160 110 2 Ref. 6, p. 14; Ref.12, pp. 42, 275

Endosulfan II 0. 0 88 0.027 2 Ref. 6, p. 14; Ref.12, pp. 42, 301

Hep t achlor epoxide 0. 0 49 0. 0 27 2 Ref. 6, p. 14; Ref.12, pp. 42, 301

Arsenic 32.7 1.19 3 Ref. 6, p. 14; Ref.12, pp. 42, 127

Cadmium 6.5 0.59 3 Ref. 6, p. 14; Ref.12, pp. 42, 127

Chromium 576 1.19 3 Ref. 6, p. 14; Ref.12, pp. 42, 127

Lead 952 0.59 3 Ref. 6, p. 14; Ref.12, pp. 42, 127

Mercury 1.6 0.059 3 Ref. 6, p. 14; Ref.12, pp. 42, 127

Zinc 1,140 2.38 3 Ref. 6, p. 14; Ref.12, pp. 42, 127

Reassessment Sampling Activities

– August 2012
Ethylbenzene

DSE

- 01

- 24

- 413 0.858 0.0999 4 Ref. 13, pp. 91

, 126

, 132

- 135, 20 7 , 374
Isopropylbenzene 0.456 0.0999 4 Ref. 13, pp. 91

, 126

, 132

- 135, 20 7 , 374

meta

- /para

- Xylene 3.9 0.20 4 Ref. 13, pp. 91

, 126

, 132

- 135, 20 7 , 374

ortho

- Xylene 2.1 0.0999 4 Ref. 13, pp. 91

, 126

, 132

- 135, 20 7 , 374

Toluene 0.641 0.0999 4 Ref. 13, pp. 91

, 126

, 132

- 135, 20 7 , 374

Anthracene 1.8 1.14 4 Ref. 13, pp. 91

, 126

, 132

- 135, 20 8 , 374

Fluorene 8.55 J 1.14 4 Ref. 13, pp. 91

, 126

, 132

- 135, 20 9 , 374

2- Methylnaphthalene 50.7 J 1.14 4 Ref. 13, pp. 91

, 126

, 132

- 135, 20 9 , 374
Naphthalene 18.3 1.14 4 Ref. 13, pp. 91

, 126

, 132

- 135, 20 9 , 374

Phenanthrene 11.9 1.14 4 Ref. 13, pp. 91

, 126

, 132

- 135, 2 10 , 374

Pyrene 1.66 1.14 4 Ref. 13, pp. 91

, 126

, 132

- 135, 2 10 , 374
Antimony 4.8J 1.3 4 Ref. 13, pp. 90

, 126

, 132

- 135, 21 2 , 374

Arsenic 28.6 1.3 4 Ref. 13, pp. 90

, 126

, 132

- 135, 21 2 , 374

Cadmium 5.8 0.7 4 Ref. 13, pp. 90

, 126

, 132

- 135, 21 2 , 374

Chromium 327 1.3 4 Ref. 13, pp. 90

, 126

, 132

- 135, 21 2 , 374

Lead 803 1.3 4 Ref. 13, pp. 90

, 126

, 132

- 135, 21 2 , 374Source Characterization

– Source 1

HRS Documentation Record 

### 15 Delta Shipyard
LAD058475419 Hazardous
Substance Evidence
References Sample ID Concentration (mg/ kg ) Quantitation
Limit 1
(mg/ kg )
Manganese 569 0.7 4 Ref. 13, pp. 90

, 126

, 132

- 135, 21 2 , 374

Mercury 1.8 0.077 4 Ref. 13, pp. 90

, 126

, 132

- 135, 21 3 , 374

Benzene

DSE

- 01

- 48

- 413 0.86 0.099 4 Ref. 13, pp. 91

, 126

, 132

- 135, 21 4 , 374
Ethylbenzene 6.04 0.0999 4 Ref. 13, pp. 91

, 126

, 132

- 135, 21 5 , 374
Isopropylbenzene 2.36 0.0999 4 Ref. 13, pp. 91

, 126

, 132

- 135, 21 5 , 374

meta

- /para

- Xylene 20.3 0.40 4 Ref. 13, pp. 91

, 126

, 132

- 135, 21 5 , 374

ortho

- Xylene 9.94 0.20 4 Ref. 13, pp. 91

, 126

, 132

- 135, 21 5 , 374

Toluene 5.94 0.0999 4 Ref. 13, pp. 91

, 126

, 132

- 135, 21 5 , 374

Fluorene 38.3 13.1 4 Ref. 13, pp. 91

, 126

, 132

- 135, 21 7 , 374

2- Methylnaphthalene 593 13.1 4 Ref. 13, pp. 91

, 126

, 132

- 135, 21 7 , 374
Naphthalene 184 13.1 4 Ref. 13, pp. 91

, 126

, 132

- 135, 21 7

, 374

Phenanthrene 89.2 13.1 4 Ref. 13, pp. 91

, 126

, 132

- 135, 21 8 , 374

Pyrene 3.41 1.31 4 Ref. 13, pp. 91

, 126

, 132

- 135, 21 8 , 374
Antimony 6.5 1.3 4 Ref. 13, pp. 90

, 126

, 132

- 135, 2 20 , 374

Arsenic 26.9 1.3 4 Ref. 13, pp. 90

, 126

, 132

- 135, 2 20 , 374

Cadmium 6 0.7 4 Ref. 13, pp. 90

, 126

, 132

- 135, 2 20 , 374

Chromium 296 1.3 4 Ref. 13, pp. 90

, 126

, 132

- 135, 2 20 , 374

Lead 733 1.3 4 Ref. 13, pp. 90

, 126

, 132

- 135, 2 20 , 374

Manganese 501 0.7 4 Ref. 13, pp. 90

, 126

, 132

- 135, 2 20 , 374

Mercury 2.07 0.156 4 Ref. 13, pp. 90

, 126

, 132

- 135, 22 1 , 374

Benzene

DSE

- 01

- 72

- 413 0.584 0.10 4 Ref. 13, pp. 9 3

, 126

, 132

- 135, 22 2 , 374
Ethylbenzene 3.97 0.10 4 Ref. 13, pp. 9 3

, 126

, 132

- 135, 22 3 , 374
Isopropylbenzene 1.55 0.10 4 Ref. 13, pp. 9 3

, 126

, 132

- 135, 22 3 , 374

meta

- /para

- Xylene 16.5 0.10 4 Ref. 13, pp. 9 3

, 126

, 132

- 135, 22 3 , 374

ortho

- Xylene 8.2 0.10 4 Ref. 13, pp. 9 3

, 126

, 132

- 135, 22 3 , 374

Toluene 3.85 0.10 4 Ref. 13, pp. 9 3

, 126

, 132

- 135, 22 3 , 374

Dibenzofuran 17.5 13.5 4 Ref. 13, pp. 9 3

, 126

, 132

- 135, 22 5 , 374

2- Methylnaphthalene 523 13.5 4 Ref. 13, pp. 9 3

, 126

, 132

- 135, 22 5 , 374

Fluorene 30.3 13.5 4 Ref. 13, pp. 9 3

, 126

, 132

- 135, 22 5 , 374
Naphthalene 164 13.5 4 Ref. 13, pp. 9 3

, 126

, 132

- 135, 22 5 , 374

Phenanthrene 77.7 13.5 4 Ref. 13, pp. 9 3

, 126

, 132

- 135, 22 6 , 374

Pyrene 3.21 1.35 4 Ref. 13, pp. 9 3

, 126

, 132

- 135, 22 6 , 374
Antimony 3.1 1.3 4 Ref. 13, pp. 9 2

, 126

, 132

- 135, 22 8 , 374

Arsenic 40.9 1.3 4 Ref. 13, pp. 9 2

, 126

, 132

- 135, 22 8 , 374

Cadmium 2.4 0.7 4 Ref. 13, pp. 9 2

, 126

, 132

- 135, 22 8 , 374

Chromium 137 1.3 4 Ref. 13, pp. 9 2

, 126

, 132

- 135, 22 8 , 374

Lead 405 1.3 4 Ref. 13, pp. 9 2

, 126

, 132

- 135, 22 8 , 374Source Characterization

– Source 1

HRS Documentation Record 

### 16 Delta Shipyard
LAD058475419 Hazardous
Substance Evidence
References Sample ID Concentration (mg/ kg ) Quantitation
Limit 1
(mg/ kg )
Manganese 355 0.7 4 Ref. 13, pp. 9 2

, 126

, 132

- 135, 22 8 , 374

Mercury 1.82 0.078 4 Ref. 13, pp. 9 2

, 126

, 132

- 135, 22 9 , 374

Benzene

D SE

- 01

- 96

- 413 0.146 0.10 4 Ref.13, pp. 9 3

, 126

, 132

- 135, 230 , 373
Ethylbenzene 1.48 0.10 4 Ref.13, pp. 9 3

, 126

, 132

- 135, 23 1 , 373
Isopropylbenzene 0.78 0.10 4 Ref.13, pp. 9 3

, 126

, 132

- 135, 23 1 , 373

meta

- /para

- Xylene 6.24 0.10 4 Ref.13, pp. 9 3

, 126

, 132

- 135, 23 1 , 373

ortho

- Xylene 2.59 0.10 4 Ref.13, pp. 9 3

, 126

, 132

- 135, 23 1 , 373

Toluene 0.828 0.10 4 Ref.13, pp. 9 3

, 126

, 132

- 135, 23 1 , 373

2- Methylnaphthalene 310 13.1 4 Ref.13, pp. 9 3

, 126

, 132

- 135, 23 3 , 373
Naphthalene 86.1 13.1 4 Ref.13, pp. 9 3

, 126

, 132

- 135, 23 3 , 373

Phenanthrene 43.7 13.1 4 Ref.13, pp. 9 3

, 126

, 132

- 135, 23 4 , 373

Antimony 5.8 1.3 4 Ref. 13, p p. 9 2

, 126

, 132

- 135, 23 6 , 373

Arsenic 63.5 1.3 4 Ref. 13, p p . 9 2

, 126

, 132

- 135, 23 6 , 373

Cadmium 3 .8 0.7 4 Ref. 13, p p . 9 2

, 126

, 132

- 135, 23 6 , 373

Chromium 73.2 1.3 4 Ref. 13, p p . 9 2

, 126

, 132

- 135, 23 6 , 373

Lead 541 1.3 4 Ref. 13, p p . 9 2

, 126

, 132

- 135, 23 6 , 373

Manganese 489 0.7 4 Ref. 13, p p. 9 2

, 126

, 132

- 135, 23 6 , 373

Mercury 1.75 0.082 4 Ref. 13, p p . 9 2

, 126

, 132

- 135, 23 7

, 373

Ethylbenzene

DSE

- 01

- 120

- 413 0.492 0.10 4 Ref. 13, pp. 9 1

, 126

, 132

- 135, 19 1 , 373
Isopropylbenzene 0.324 0.10 4 Ref. 13, pp. 9 1

, 126

, 132

- 135, 19 1 , 373

meta

- /para

- Xylene 2.1 0.20 4 Ref. 13, pp. 9 1

, 126

, 132

- 135, 19 1 , 373

ortho

- Xylene 0.977 0.10 4 Ref. 13, pp. 9 1

, 126

, 132

- 135, 19 1 , 373

Toluene 0.349 0.10 4 Ref. 13, pp. 9 1

, 126

, 132

- 135, 19 1 , 373

2- Methylnaphthalene 213 14.4 4 Ref. 13, pp. 9 1

, 126

, 132

- 135, 19 3 , 373

Fluorene 14.9 14.4 4 Ref. 13, pp. 9 1

, 126

, 132

- 135, 19 3 , 373
Naphthalene 44.2 1.44 4 Ref. 13, pp. 9 1

, 126

, 132

- 135, 19 3 , 373

Phenanthrene 33.4 33.4 4 Ref. 13, pp. 9 1

, 126

, 132

- 135, 19 4 , 373

Pyrene 1.55 1.44 4 Ref. 13, pp. 9 1

, 126

, 132

- 135, 19 4 , 373
Antimony 1.9 1.4 4 Ref. 13, pp. 90

, 126

, 132

- 135, 19 6 , 373

Arsenic 26.3 1.4 4 Ref. 13, pp. 90

, 126

, 132

- 135, 19 6 , 373

Cadmium 1.5 0.7 4 Ref. 13, pp. 90

, 126

, 132

- 135, 19 6 , 373

Chromium 96.2 1.4 4 Ref. 13, pp. 90

, 126

, 132

- 135, 19 6 , 373

Lead 310 1.4 4 Ref. 13, pp. 90

, 126

, 132

- 135, 19 6 , 373

Manganese 465 0.7 4 Ref. 13, pp. 90

, 126

, 132

- 135, 19 6 , 373

Mercury 0.609 0.081 4 Ref. 13, pp. 90

, 126

, 132

- 135, 19 7 , 373

Phenanthrene DSE

- 01

- 144

- 413 1.97 0.330 4 Ref. 13, pp. 9 1

, 126

, 132

- 135, 20 2 , 373
Antimony 1.8 1.5 4 Ref. 13, pp. 90

, 126

, 132

- 135, 20 4 , 373Source Characterization

– Source 1

HRS Documentation Record 

### 17 Delta Shipyard
LAD058475419 Hazardous
Substance Evidence
References Sample ID Concentration (mg/ kg ) Quantitation
Limit 1
(mg/ kg )

Arsenic 37.3 1.5 4 Ref. 13, pp. 90

, 126

, 132

- 135, 20 4 , 373

Chromium 17.3 0.8 4 Ref. 13, pp. 90

, 126

, 132

- 135, 20 4 , 373

Lead 131 1.2 4 Ref. 13, pp. 90

, 126

, 132

- 135, 20 4 , 373

Manganese 358 0.8 4 Ref. 13, pp. 90

, 126

, 132

- 135, 20 4 , 373

Mercury 0.142 0.104 4 Ref. 13, pp. 90

, 126

, 132

- 135, 20 5 , 373

Notes: mg/ kg = milligrams per kilogram = 1,000 micrograms per kilogram (ug/ kg )
J The identification of the analyte is acceptable; t he 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 , p p

. 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 Quant itation 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 hi storical 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.) avail able 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 ha s 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
S ite , which allows the user to trace an area and determine length and width measurements of the pits (Ref. 19) . T he 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 Pi t 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: 1,826.923Source 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 (Attachmen t A, Figure A

- 2 ; Ref. 13, p.
11 2 ; 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 t he pit is black and appe ars 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 S ite 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 S ite 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 ( P0 3 and P0 4 ) ( 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 w ere a nalyzed 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 th e 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
Limit 1
(mg/kg)

ESI Sampling Activities

– July 1996

Ethylbenzene 4.5 2.1 2 Ref. 6, p. 14 ; Ref.12, pp. 42, 225

Toluene 3.8 2.1 2 Ref. 6, p. 14 ; Ref.12, pp. 42, 225
Xylenes P03

- 71

- 1/ 28.0 2.1 2 Ref. 6, p. 14 ; Ref.12, pp. 42, 225

2- Methylnaphalene G42511 470 110 2 Ref. 6, p. 14 ; Ref.12, pp. 42, 269
Naphthalene 160 110 2 Ref. 6, p. 14 ; Ref.12, pp. 42, 269

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

– Source 2

HRS Documentation Record 

### 21 Delta Shipyard
LAD058475419 Hazardous
Substance Evidence
References Sample ID Concentration (mg/kg) Quantitation
Limit 1
(mg/kg)

Endosulfan II 0.089 0.028 2 Ref. 6, p. 14 ; Ref.12, pp. 42, 299

Hep t achlor epoxide 0.089 0.028 2 Ref. 6, p. 14 ; Ref.12, pp. 42, 299

Arsenic 27.6 1.16 3 Ref. 6, p. 14 ; Ref.12, pp. 42, 125

Cadmium 5.1 0.58 3 Ref. 6, p. 14 ; Ref.12, pp. 42, 125

Chromium 520 1.16 3 Ref. 6, p. 14 ; Ref.12, pp. 42, 125

Lead 771 0.58 3 Ref. 6, p. 14 ; Ref.12, pp. 42, 125

Mercury 1.2 0.05 3 2 Ref. 6, p. 14 ; Ref.12, pp. 42, 125

Zinc 1,020 2.33 3 Ref. 6, p. 14 ; Ref.12, pp. 42, 125

Xylenes

P04

- 71

- 1 /
G42510 2.0 1.7 2 Ref. 6, p. 14; Ref.12, pp. 42, 223

2- Methylnaphthalene 130 90 2 Ref. 6, p. 14; Ref.12, pp. 42, 267
Naphthalene 48.0 J 90 2 Ref. 6, p. 14; Ref.12, pp. 42, 267

Arsenic 48.2 1.48 3 Ref. 6, p. 14; Ref.12, pp. 42, 124

Cadmium 3.5 0.74 3 Ref. 6, p. 14; Ref.12, pp. 42, 124

Chromium 104 1.48 3 Ref. 6, p. 14; Ref.12, pp. 42, 124

Lead 520 0.74 3 Ref. 6, p. 14; Ref.12, pp. 42, 124

Mercury 0.98 0.074 3 Ref. 6, p. 14; Ref.12, pp. 42, 124

Zinc 808 2.96 3 Ref. 6, p. 14; Ref.12, pp. 42, 124

Reassessment Sampling Activities

– August 2012

2- Methylnaphthalene

DSE

- 02

- 24

- 413 480 12.2 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 15 8 , 371

Dibenzofuran 16.3 12.2 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 15 8 , 371

Fluorene 28.1 12.2 4 Ref. 13, pp. 9 5 , 12 5

, 132

- 135, 15 8 , 371
Naphthalene 142 12.2 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 15 8 , 371

Phenanthrene 72.6 12.2 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 15 9 , 371

Antimony 6.3 1.3 4 Ref. 13, pp. 9 4 , 12 5 , 132

- 135, 16 1 , 371

Arsenic 26.7 1.3 4 Ref. 13, pp. 9 4 , 12 5

, 132

- 135, 16 1 , 371

Cadmium 6.9 0.6 4 Ref. 13, pp. 9 4 , 12 5 , 132

- 135, 16 1 , 371

Chromium 179 1.3 4 Ref. 13, pp. 9 4 , 12 5 , 132

- 135, 16 1 , 371

Lead 669 1.3 4 Ref. 13, pp. 9 4 , 12 5 , 132

- 135, 16 1 , 371

Manganese 502 0.6 4 Ref. 13, pp. 9 4 , 12 5 , 132

- 135, 16 1 , 371

Mercury 2.24 0.171 4 Ref. 13, pp. 9 4 , 12 5 , 132

- 135, 16 2 , 371

Benzene

DSE

- 02

- 48

- 413 0.762 0.0999 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135 , 16 3 , 372
Ethylbenzene 4.62 0.0999 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135 , 16 4 , 372
Isopropylbenzene 1.82 0.0999 4 Ref. 13, pp. 9 5

, 12 5 , 132

- 135 , 16 4 , 372

meta

- /para

- Xylene 23.3 0.399 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135 , 16 4 , 372

ortho

- Xylene 11.3 0.200 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135 , 16 4 , 372

Toluene 5.09 0.0999 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135 , 16 4 , 372Source Characterization

– Source 2

HRS Documentation Record 

### 22 Delta Shipyard
LAD058475419 Hazardous
Substance Evidence
References Sample ID Concentration (mg/kg) Quantitation
Limit 1
(mg/kg)

2- Methylnaphthalene 612 26.6 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135 , 16 6 , 372

Anthracene 6.93 1.33 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135 , 16 5 , 372

Dibenzofuran 26 3.33 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135 , 16 6 , 372

Fluoranthene 3.44 1.33 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135 , 16 6 , 372

Fluorene 44.1 1.33 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135 , 16 6 , 372
Naphthalene 188 26.6 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135 , 16 6 , 372

Phenanthrene 103 26.6 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135 , 16 7 , 372

Pyrene 2.09 1.33 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135 , 16 7 , 372
Antimony 8.7 1.4 4 Ref. 13, pp. 94, 12 5 , 132

- 135 , 16 9 , 372

Arsenic 41.9 1.4 4 Ref. 13, pp. 94, 12 5 , 132

- 135 , 16 9 , 372

Cadmium 10.2 0.7 4 Ref. 13, pp. 94, 12 5 , 132

- 135 , 16 9 , 372

Chromium 191 1.4 4 Ref. 13, pp. 94, 12 5 , 132

- 135 , 16 9 , 372

Lead 1,170 1.4 4 Ref. 13, pp. 94, 12 5

, 132

- 135 , 16 9 , 372

Manganese 726 0.7 4 Ref. 13, pp. 94, 12 5 , 132

- 135 , 16 9 , 372

Mercury 2.67 0.176 4 Ref. 13, pp. 94, 12 5 , 132

- 135 , 169, 372

Benzene

DSE

- 02

- 72

- 413 1.01 0.0999 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 17 1 , 372
Ethylbenzene 3.52 0.0999 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 17 2 , 372
Isopropylbenzene 1.36 0.0999 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 17 2 , 372

meta

- /para

- Xylene 15.8 0.200 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 17 2 , 372

ortho

- Xylene 7.97 0.0999 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 17 2 , 372

Toluene 4.48 0.0999 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 17 2 , 372

2- Methylnaphthalene 517 13.0 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 17 4 , 372

Anthracene 13 13.0 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 17 3 , 372

Fluorene 61.7 13.0 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 17 4 , 372
Naphthalene 79.9 13.0 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 17 4 , 372

Phenanthrene 100 13.0 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 17 5 , 372

Pyrene 13.5 13.0 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 17 5 , 372
Antimony 4.7 1.3 4 Ref. 13, pp. 9 4 , 12 5 , 132

- 135, 17 7 , 372

Arsenic 25.1 1.3 4 Ref. 13, pp. 9 4 , 12 5 , 132

- 135, 17 7 , 372

Cadmium 5.6 0.6 4 Ref. 13, pp. 9 4 , 12 5 , 132

- 135, 17 7 , 372

Chromium 218 1.3 4 Ref. 13, pp. 9 4 , 12 5 , 132

- 135, 17 7 , 372

Lead 590 1.3 4 Ref. 13, pp. 9 4 , 12 5 , 132

- 135, 17 7 , 372

Manganese 432 0.6 4 Ref. 13, pp. 9 4 , 12 5 , 132

- 135, 17 7 , 372

Mercury 1.1 0.072 4 Ref. 13, pp. 9 4 , 12 5 , 132

- 135, 17 8 , 372

Benzene

DSE

- 02

- 96

- 413 0.732 0.10 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 1 80 , 372
Ethylbenzene 6.48 0.10 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 1 80 , 372
Isopropylbenzene 2.65 0.10 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 1 80 , 372Source Characterization

– Source 2

HRS Documentation Record 

### 23 Delta Shipyard
LAD058475419 Hazardous
Substance Evidence
References Sample ID Concentration (mg/kg) Quantitation
Limit 1
(mg/kg)

meta

- /para

- Xylene 23.9 0.40 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 1 80 , 372

ortho

- Xylene 11.8 0.20 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 1 80 , 372

Toluene 7.45 0.10 4 Ref. 13, pp. 9 5 , 12 5

, 132

- 135, 1 80 , 372

2- Methylnaphthalene 182 10.6 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 18 2 , 372

Fluorene 12.8 10.6 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 18 2 , 372
Naphthalene 50.6 10.6 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 18 2 , 372

Phenanthrene 31.3 10.6 4 Ref. 13, pp. 95 , 12 5 , 132

- 135, 18 3 , 372

Pyrene 1.27 0.53 4 Ref. 13, pp. 9 5 , 12 5 , 132

- 135, 18 3 , 372
Antimony 4.5 1.3 4 Ref. 13, pp. 9 4 , 12 5 , 132

- 135, 18 5 , 372

Arsenic 43.9 1.3 4 Ref. 13, pp. 9 4 , 12 5 , 132

- 135, 18 5 , 372

Cadmium 5.8 0.7 4 Ref. 13, pp. 9 4 , 12 5 , 132

- 135, 18 5 , 372

Chromium 114 1.3 4 Ref. 13, pp. 9 4 , 12 5 , 132

- 135, 18 5 , 372

Lead 572 1.3 4 Ref. 13, pp. 9 4 , 12 5 , 132

- 135, 18 5 , 372

Manganese 511 0.7 4 Ref. 13, pp. 9 4 , 12 5 , 132

- 135, 18 5 , 372

Mercury 0.260 0.089 4 Ref. 13, pp. 9 4 , 12 5 , 132

- 135, 18 6 , 372

Ethylbenzene

DSE

- 02

- 120

- 413 0.677 0.0999 4 Ref. 13, pp. 9 3 , 12 5 , 132

- 135, 1 40 , 371
Isopropylbenzene 0.354 0.0999 4 Ref. 13, pp. 9 3 , 12 5 , 132

- 135, 1 40 , 371

meta

- /para

- Xylene 2.92 J 0.2 4 Ref. 13, pp. 9 3 , 12 5 , 132

- 135, 1 40 , 371

ortho

- Xylene 1.47 0.0999 4 Ref. 13, pp. 9 3 , 12 5

, 132

- 135, 1 40 , 371

Toluene 0.445 0.0999 4 Ref. 13, pp. 9 3 , 12 5 , 132

- 135, 1 40 , 371

2- Methylnaphthalene 165 J 1.78 4 Ref. 13, pp. 9 3 , 12 5 , 132

- 135, 14 2 , 371

Fluorene 17.2 0.714 4 Ref. 13, pp. 9 3 , 12 5 , 132

- 135, 14 2 , 371

Fluoranthene 0.964 J 0.714 4 Ref. 13, pp. 9 3 , 12 5 , 132

- 135, 14 2 , 371

Dibenzofuran 10.2 1.78 4 Ref. 13, pp. 9 3 , 12 5 , 132

- 135, 14 2 , 371
Naphthalene 46.8 J 7.14 4 Ref. 13, pp. 9 3 , 12 5 , 132

- 135, 14 2 , 371

Phenanthrene 26.9 J 0.714 4 Ref. 13, pp. 9 3 , 12 5 , 132

- 135, 14 3

, 371

Pyrene 0.909 0.714 4 Ref. 13, pp. 9 3 , 125, 132

- 135, 143, 371

Arsenic 43.1 1.8 4 Ref. 13, pp. 9 2 , 125, 132

- 135, 145, 371

Cadmium 1.7 0.9 4 Ref. 13, pp. 9 2 , 125, 132

- 135, 145, 371

Chromium 27.1 1.8 4 Ref. 13, pp. 9 2 , 125, 132

- 135, 145, 371

Lead 222 1.8 4 Ref. 13, pp. 9 2 , 125, 132

- 135, 145, 371

Manganese 379 0.9 4 Ref. 13, pp. 9 2 , 125, 132

- 135, 145, 371

Mercury 0.655 0.121 4 Ref. 13, pp. 9 2 , 125, 132

- 135, 146, 371

2- Methylnaphthalene

DSE

- 02

- 144

- 413 1.39 0.344 4 Ref. 13, pp. 9 3 , 125, 132

- 135, 1 50

, 371

Phenanthrene 0.642 0.344 4 Ref. 13, pp. 9 3 , 125, 132

- 135, 1 51 , 371

Arsenic 6.9 1.6 4 Ref. 13, pp. 9 2 , 125, 132

- 135, 15 3 , 371

Chromium 12.7 1.6 4 Ref. 13, pp. 9 2 , 125, 132

- 135, 15 3 , 371Source Characterization

– Source 2

HRS Documentation Record 

### 24 Delta Shipyard
LAD058475419 Hazardous
Substance Evidence
References Sample ID Concentration (mg/kg) Quantitation
Limit 1
(mg/kg)

Lead 30.4 1.6 4 Ref. 13, pp. 9 2 , 125, 132

- 135, 15 3 , 371

Manganese 210 0.8 4 Ref. 13, pp. 9 2 , 125, 132

- 135, 15 3 , 371

Notes: mg/kg = milligrams per kilogram = 1,000 micrograms per kilogram (ug/kg)
J The identification of the analyte is acceptable; t he 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 Limi t (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, p p . 134

- 135 ; Ref. 29).

2 Quantitation limit provide d 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 Quant itation 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 hazard ous 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.) a vailable 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 fo r 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
S ite, which allows the user to trace an area and determine length and width measurements of the pits (Ref. 19)

. T he area of Source 2 was calculated to total 26,875 square feet (Att achment 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 S ource 2 ( square feet ): 26,875
Area Assigned Value = 26,875 / 13
Area Assigned Value = 2,067.30 7

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), haz ardous 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 2,067.30 7



### Source Hazardous Waste Quantity Value: 2,067.30 7Source 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 t he 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
feat ures; 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 t he pit is black and appe ars to be a dried oil/petroleum

- type waste (Ref. 7, pp. 1, 3, 5, 6; R ef. 12, pp. 16, 17). Although Pit 3 is separated from the other pits by a berm, photo logs from the S ite 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 S ite 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 PC Bs/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 w ere a nalyzed for TCL VOCs , TCL SVO Cs, 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 th e 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
Limit 1
(mg/kg)

ESI Sampling Activities

– July 1996

Ethylbenzene 8.6 2.3 2 Ref. 6, p. 14; Ref.12, pp. 42, 219

Toluene 6.4 2.3 2 Ref. 6, p. 14; Ref.12, pp. 42, 219
Xylenes P05

- 71

- 1/
G42508 56.0 2.3 2 Ref. 6, p. 14; Ref.12, pp. 42, 219

2- Methylnaphthalene 410 120 2 Ref. 6, p. 14; Ref.12, pp. 42, 260
Naphthalene 130 120 2 Ref. 6, p. 14; Ref.12, pp. 42, 260

Arsenic 61.2 1.06 3 Ref. 6, p. 14; Ref.12, pp. 42, 122

Cadmium 12.2 0.53 3 Ref. 6, p. 14; Ref.12, pp. 42, 122Source Characterization

– Source 3

HRS Documentation Record 

### 28 Delta Shipyard
LAD058475419 Evidence
Hazardous
Substance References Sample ID Concentration (mg/kg) Quantitation
Limit 1
(mg/kg)

Chromium 371 1.06 3 Ref. 6, p. 14; Ref.12, pp. 42, 122

Lead 561 0.53 3 Ref. 6, p. 14; Ref.12, pp. 42, 122

Mercury 0.81 0.053 3 Ref. 6, p. 14; Ref.12, pp. 42, 122

Zinc 2,160 2.13 3 Ref. 6, p. 14; Ref.12, pp. 42, 122
Ethylbenzene 9.0 2.1 2 Ref. 6, p. 14; Ref.12, pp. 43, 221

Toluene 7.4 2.1 2 Ref. 6, p. 14; Ref.12, pp. 43, 221
Xylenes 59.0 2.1 2 Ref. 6, p. 14; Ref.12, pp. 43, 221

2- Methylnaphthalene 470 110 2 Ref. 6, p. 14; Ref.12, pp. 43, 263
Naphthalene P05

- 72

- 1/
G42509 160 110 2 Ref. 6, p. 14; Ref.12, pp. 43, 263

Arsenic 48.9 1.17 3 Ref. 6, p. 14; Ref.12, pp. 43, 123

Cadmium 15.2 0.58 3 Ref. 6, p. 14; Ref.12, pp. 43, 123

Chromium 384 1.17 3 Ref. 6, p. 14; Ref.12, pp. 43, 123

Lead 525 0.58 3 Ref. 6, p. 14; Ref.12, pp. 43, 123

Mercury 0.76 0.058 3 Ref. 6, p. 14; Ref.12, pp. 43, 123

Zinc 2,500 3.42 3 Ref. 6, p. 14; Ref.12, pp. 43, 123

Xylenes 13.0 2.4 2 Ref. 6, p. 14; Ref.12, pp. 43, 217
Heptachlor epoxide

P06

- 71

- 1/
G42507 0.078 0.033 2 Ref. 6, p. 14; Ref.12, pp. 43, 295

Cadmium 6.2 0.051 3 Ref. 6, p. 14; Ref.12, pp. 43, 121

Chromium 451 1.02 3 Ref. 6, p. 14; Ref.12, pp. 43, 121

Mercury 0.85 0.051 3 Ref. 6, p. 14; Ref.12, pp. 43, 121

Zinc 1,190 3.49 3 Ref. 6, p. 14; Ref.12, pp. 43, 121

Reassessment Sampling Activities

– August 2012
Ethylbenzene

DSE

- 03

- 24

- 413 0.163 0.10 4 Ref. 13, pp. 9 7 , 12 6

, 132

- 135, 26 1 , 377
Isopropylbenzene 0.286 0.10 4 Ref. 13, pp. 9 7 , 12 6

, 132

- 135, 26 1 , 377

meta

- /para

- Xylene 0.812 0.20 4 Ref. 13, pp. 9 7 , 12 6

, 132

- 135, 26 1 , 377

ortho

- Xylene 0.501 0.10 4 Ref. 13, pp. 9 7 , 12 6

, 132

- 135, 26 1 , 377

Toluene 0.103 0.10 4 Ref. 13, pp. 9 7 , 12 6

, 132

- 135, 26 1 , 377

2- Methylnaphthalene 98.4 15.0 4 Ref. 13, pp. 9 7 , 12 6

, 132

- 135, 26 2 , 377

Anthracene 2.55 1.5 4 Ref. 13, pp. 9 7 , 12 6, 132

- 135, 26 2 , 377

Fluorene 11.6 1.5 4 Ref. 13, pp. 9 7 , 12 6

, 132

- 135, 26 2 , 377
Naphthalene 10.6 1.5 4 Ref. 13, pp. 9 7 , 12 6

, 132

- 135, 26 3 , 377

Phenanthrene 23.5 1.5 4 Ref. 13, pp. 9 7 , 12 6

, 132

- 135, 26 4 , 377

Pyrene 2.2 1.5 4 Ref. 13, pp. 9 7 , 12 6

, 132

- 135, 26 4 , 377

Arsenic 18.1 1.5 4 Ref. 13, pp. 9 6 , 12 6

, 132

- 135, 26 6 , 377

Cadmium 1.7 0.8 4 Ref. 13, pp. 9 6 , 12 6

, 132

- 135, 26 6 , 377

Lead 194 1.5 4 Ref. 13, pp. 9 6 , 12 6

, 132

- 135, 26 6 , 377Source Characterization

– Source 3

HRS Documentation Record 

### 29 Delta Shipyard
LAD058475419 Hazardous
Substance Evidence
References Sample ID Concentration (mg/kg) Quantitation
Limit 1
(mg/kg)
Manganese 304 0.8 4 Ref. 13, pp. 9 6 , 12 6

, 132

- 135, 26 6 , 377

Mercury 0.478 0.084 4 Ref. 13, pp. 9 6 , 12 6

, 132

- 135, 26 7 , 377

Ethylbenzene

DSE

- 03

- 48

- 413 0.223 0.0999 4 Ref. 13, pp. 9 7 , 12 6

, 132

- 135, 27 1 , 377
Isopropylbenzene 0.109 0.0999 4 Ref. 13, pp. 9 7 , 12 6

, 132

- 135, 27 1

, 377

meta

- /para

- Xylene 0.891 0.20 4 Ref. 13, pp. 9 7 , 12 6

, 132

- 135, 27 1 , 377

ortho

- Xylene 0.463 0.0999 4 Ref. 13, pp. 9 7 , 12 6

, 132

- 135, 27 1 , 377

Toluene 0.153 0.0999 4 Ref. 13, pp. 9 7 , 12 6

, 132

- 135, 27 1 , 377

2- Methylnaphthalene 21.8 3.15 4 Ref. 13, pp. 9 7 , 12 6

, 132

- 135, 27 3 , 377

Anthracene 0.455 0.315 4 Ref. 13, pp. 9 7 , 12 6

, 132

- 135, 27 2 , 377

Dibenzofuran 0.913 0.788 4 Ref. 13, pp. 9 7 , 12 6

, 132

- 135, 27 3 , 377

Fluoranthene 0.520 0.315 4 Ref. 13, pp. 9 7 , 12 6

, 132

- 135, 27 3 , 377

Fluorene 2.63 0.315 4 Ref. 13, pp. 9 7 , 12 6

, 132

- 135, 27 3 , 377
Naphthalene 5.19 3.15 4 Ref. 13, pp. 9 7 , 12 6

, 132

- 135, 27 3 , 377

Phenanthrene 4.93 0.315 4 Ref. 13, pp. 9 7 , 12 6, 132

- 135, 27 4 , 377

Pyrene 0.701 0.315 4 Ref. 13, pp. 9 7 , 12 6, 132

- 135, 27 4 , 377

Arsenic 26.6 1.4 4 Ref. 13, pp. 95, 12 6, 132

- 135, 27 6 , 377

Cadmium 0.7 0.7 4 Ref. 13, pp. 95, 12 6

, 132

- 135, 27 6 , 377

Lead 25.9 1.4 4 Ref. 13, pp. 95, 12 6

, 132

- 135, 27 6 , 377

Manganese 541 0.7 4 Ref. 13, pp. 95, 12 6

, 132

- 135, 27 6 , 377

Mercury 0.207 0.081 4 Ref. 13, pp. 95, 12 6

, 132

- 135, 27 7 , 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 Limi t (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, p p . 134

- 13 5 ; 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 Quant itation 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 theSource Characterization

– Source 3

HRS Documentation Record 

### 30 Delta Shipyard
LAD058475419 

### source and the associated releases from the source. Th erefore, 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 S ite, which allows the user to trace an area and determine length and width measurements of the pits (Ref. 19) . T he 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: 2 35 feet x 150 feet = 35,250 square feet
Area o f Source 3 ( square feet ): 35,250
Area Assigned Value = 35250/13
Area Assigned Value = 2,711.538Source 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: 2,711.538Source Characterization

– Source 4

HRS Documentation Record 

### 32 Delta Shipyard
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 i s west of and runs parallel to Pits 1 through 3 . It t hen 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 i nundation 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). 

### - 10Source 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 A

5, Ref. 6, p. 16; Ref. 12, p. 30 ). Th e 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. 12 5 ). The samples w ere a nalyzed 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)

. 

### Th e samples were submitted to th e 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 Sit e is summarized below.

Hazardous Substance Evidence
References Sample ID Concentration (mg/kg) Quantitation
Limit 1
(mg/kg)

ESI Sampling Activities

– July 1996

Chromium D01

- 51

- 1/
MFGY33 75.2 2 3 Ref. 6, p. 16; Ref.12, pp. 61, 445

Zinc 2350 4 3 Ref. 6, p. 16; Ref.12, pp. 62, 445

2- Methylnaphthalene D02

- 51

- 1/

FFE74/

MFGY34 1.5 J 0.80 2 Ref. 6, p. 16; Ref.12, pp. 61, 435
Naphthalene 0.860 J 0.80 2 Ref. 6, p. 16; Ref.12, pp. 61, 437

Phenanthrene 0.880 J 0.80 2 Ref. 6, p. 16; Ref.12, pp. 61, 221

Chromium 123 2 3 Ref. 6, p. 16; Ref.12, pp. 61, 123

Benzo(b)fluoranthene D02

- 52

- 1/

FFE75/

MFGY35 1.1 J^ 0.73 2 Ref. 6, p. 16; Ref.12, pp. 61, 436

Benzo(k)fluoranthene 1.1 J^ 0.73 2 Ref. 6, p. 16; Ref.12, pp. 61, 436

Chromium 92.1 2 3 Ref. 6, p. 16; Ref.12, pp. 61, 445

Chromium D03

- 52

- 1/

MFGY37 68.4 2 3 Ref. 6, p. 16; Ref.12, pp. 61, 445

Chromium D04

- 51

- 1/

MFGY38 232 1 3 Ref. 6, p. 16; Ref. 12, pp. 61, 446

Reassessment Sampling Activities

– August 2012

Arsenic DSE

- 07/ 24” (MF6AA6) 54.7 0.92 4 Ref. 13, pp.
423 30, 125, 386

- 388, 400, 416

,

Mercury 0.32 0.13 4 Ref. 13, pp.
423 30, 125, 386

- 388, 400, 416

,Source Characterization

– Source 4

HRS Documentation Record 

### 34 Delta Shipyard
LAD058475419 Hazardous
Substance Evidence
References Sample ID Concentration (mg/kg) Quantitation
Limit 1
(mg/kg)

Cadmium DSE

- 10/ 12” (MF6AB0) 3.8 0.46 4 Ref. 13, pp. 16, 125, 386

- 388, 404, 417

, 424

Mercury 0.85 0.12 4 Ref. 13, pp. 16, 125, 386

- 388, 404, 417

, 424

Fluorene DSE

- 10/ 24” (F6AB1) 1.6 1.0 4 Ref. 13, pp. 3 3

, 125, 428

- 430, 435, 4 70,
500

Phenanthrene 3.5 1.0 4 Ref. 13, pp. 3 3

, 125, 428

- 430, 435, 4 70,
500

Arsenic

DSE

- 10/ 24” (MF6AB1) 62.5 0.92 4 Ref. 13, pp. 32, 125, 385

- 388, 405, 4 18,
424

Cadmium 18.3 0.46 4 Ref. 13, pp. 32, 125, 385

- 388, 405, 418,
424

Chromium 52.6 0.92 4 Ref. 13, pp. 32, 125, 385

- 388, 405, 418,
424

Lead 2,170 J 0.92 4 Ref. 13, pp. 32, 125, 385

- 388, 405, 418,
424

Manganese 671 1.4 4 Ref. 13, pp. 32, 125, 385

- 388, 405, 418,
424

Mercury 1.8 0.12 4 Ref. 13, pp. 32, 125, 385

- 388, 405, 418,
424

Arsenic DSE

- 13/ 24” (MF6AB8) 27.7 1.0 4 Ref. 13, pp. 32, 125, 385

- 388, 411, 419

, 425

Manganese 531 1.5 4 Ref. 13, pp. 32, 125, 385

- 388, 411, 419,
425

Arsenic

DSE

- 16/ 24” (MF6AC9) 36.1 J 1.0 4 Ref. 13, pp. 32, 125, 711

- 714 , 72 2 , 7 41

, 7 50

Cadmium 1.0 0.5 4 Ref. 13, pp. 32, 125, 711

- 714 , 72 2 , 7 41

, 7 50

Lead 189 1.0 4 Ref. 13, pp. 32, 125, 711

- 714 , 72 2 , 7 41

, 7 50

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 Limi t (CRQL) and Contract Required Detection Limit (CRDL) terminology used by the CLP Laboratory are based on detection limits that hav e been adjusted for sample aliquot, sample volume, and dilutions for the analysis (Ref. 1, Section 1.1, Table 2

- 3; Ref. 13, p p . 134

- 135 ; Ref. 29).

2 Quantitation limit provided is an adjusted CRQL ( Ref. 12, pp. 400

- 405; Ref. 29 ).

3 Quantitation limi t provided is an adjusted CRDL (Ref. 12, p. 406 ; Ref. 29).

4 Quant itation 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 knownSource 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 p lus 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, Sectio n 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 i s documented tha t the waste in the source contains hazardous substances (s ee Secti on 2.4.1 for Source 4 of this report ). T herefore , 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
LAD058475419 Tier E valuated Source 4 Values

A Not Evaluated

B Not Evaluated

C >0 , but unknown

D 0



### Source Hazardous Waste Quantity Value: >0, but unknownOther Sources

HRS Documentation Record 

### 37 Delta Shipyard
LAD058475419 

### Other Sources Not Scored

The backfilled pit area, referred to as Pit 4, covers approximately 23,800 square feet (ft 2 

### ), contain s 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 a nd 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
LAD058475419 

### 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 EvaluatedGW Pathway

– Not Scored

HRS Documentation Record 

### 39 Delta Shipyard
LAD058475419 

### 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 drinki ng water wells located
wit hin 4 miles of the S ite, 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 bg s, respectively in an approximately 100

- foot

- wide strip of land betwee n the pits an d 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 μ g/L), phen anthrene (9 μ g/L), barium ( 29,400 μ g/L), chromium ( 507 μ g/L), l ead ( 482 μ g/L), and z inc (3, 290 μ g/L) were detected

. All of these constituents were also detected in samples collected from the three open pits (Source 1) (Ref. 12, p. 4 6).SW Pathway

– Overland/Flood Migration

HRS Documentation Record 

### 40 Delta Shipyard
LAD058475419 

### 4.0 SURFACE WATER MIGRATION PATHWAY

4.1 OVERLAND/FLOOD MIGRATION COMPONENT

4.1.1 General Considerations

4.1.1.1 Definition of Hazardous Substan ce Migration Path for Overland/F lood 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 S ite (Ref. 1, Section 4.1.1.1)

. There is one watershed for the h azardous 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
T DL are considered tidally influenced, the S ite is located approximately 50 stream miles from the Gulf
Coast

, and the water in the area is freshwater . T herefore, the tidal carry within the TDL is not
considered influential and was not evaluated (Ref. 21 , pp. 8, 1 2). 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 S ite 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, p p. 3-4 ). The pits themselves are considered Palustrine, unconsolidated bottom, non

- tida l permanent water regime, excavated (PUBHx) wetlands and are man

made 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 area s 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 ea ch source could be
considered to be PPE s , 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 relativelySW 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 allow s 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

HRS Documentation Record 

### 42 Delta Shipyard
LAD058475419 

### 4.1.2.1 LIKELIHOOD OF RELEASE

4.1.2.1.1 Observed Release

Direct Observation

An o bserved 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 Swa m p, clays and murky clays (Ref. 31, pp. 1 -2). The wetlands are currently re

emerging into the sources (Ref. 20, pp. 3

- 6, 10

- 13, 32

- 36, 38

- 39). T herefore, 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 S ite (operations that have demonstrated to cause releases of arsenic, antimony, anthracene, benzene, cadmium, chromium, ethylbenzene, fluorene, lead, manganese, mercury, 2

-

m ethylnaphthalene, 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 S ite (see Section 2.2 for Source 1, 2, 3 and 4 o f 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 S ite . During the August 2012 sampling activities, samp les 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

s ampling 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

wet lands surrounding Sources 1 -3 and one for the Company Canal at the mouth of the drain age 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 sample s w ere 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 sample s contaminant concentrations collected from the wetland areSW 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 S ite to the surrounding wetlands can be established (Ref. 13, pp. 3, 4 ).

A background sediment sample was also collected from Company Canal upstream o f 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 sample s from the wetlands and the Company Canal were collected on 09 August 2012 by EPA contractors (Ref. 13, p p

. 107, 120)

. The wetland sediment sample s w ere collected using a direct push technology subsurface coring device. The direct push cores were advanced to a depth of 8 feet bgs with samples collec ted 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
col lected, the sediment sample bottles were placed on ice until shipping (Ref. 13, pp. 4, 5 ). The background sample s and the samples collected to demonstrate the presence of contamination

, the potential migration path, and to demonstrate observed release s 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 b ackgrou nd sample s were collected from a similar location (within the same
wetland o r 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 , p esticides, and PCBs

. Se diment samples for inorganic analysis for all samples but CC -01 were 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 th e 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, P esticides

, and PCBs by CLP SOM01.2 and for TAL metals and mercury by CLP ISM01.3 (Ref. 13, p. 5).

EPA Reassessmen t Sampling Event - Background Sampl e Description August 2012

Station Location

(Sample ID ) Sampl e 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 , p p

. 12 8 , 6 42

, 1025

CC

- 01 (CC

- 01

- 03

- 611/ F6AL0 ) Upstream of the S ite within Company Canal 08/09/201 2 (1115) Ref. 13, pp. 107, 379, 1112SW 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 Concen tration mg/kg Quantitation
Limit 1
mg/kg

2- Methylnaphthalene DSE

- 21/ 12”
F6AM2 0.22 U 0.22 2 Ref. 13, pp. 20, 929

- 935, 941

- 942, 996, 1025 Chromium DSE

- 21/ 12”
MF6AM2 92.6 1.0 2 Ref. 13, pp.20, 899

- 903, 910, 915 Lead 211 1.0 2 Ref. 13, pp.20, 899

- 903, 910, 915 Mercury 0.27 0.12 2 Ref. 13, pp.20, 899

- 903, 910, 915

Ethylben z ene

DSE

- 21/ 24”
F6AM3 0.0081 U 0.0081 2 Ref. 13, pp. 35, 929

- 935, 943

- 944, 970, 1026

o- Xy l ene 0.0081 U 0.0081 2 Ref. 13, pp. 35, 929

- 935, 943

- 944, 970, 1026

m,p

- Xylene 0.0081 U 0.0081 2 Ref. 13, pp. 35, 929

- 935, 943

- 944, 970, 1026
Isopropylbenzene 0.0081 U 0.0081 2 Ref. 13, pp. 35, 929

- 935, 943

- 944, 970, 1026
Benzo(g,h,i)perylene 0.270 U 0.270 2 Ref. 13, pp. 35, 929

- 935, 946

, 998

, 1026
Naphthalene 0.270 U 0.270 2 Ref. 13, pp. 35, 929

- 935, 945

- 946, 997, 1025

2- Methylnaphthalene 0.270 U 0.270 2 Ref. 13, pp. 34 , 929

- 935, 945

- 946, 997, 1025

Fluorene 0.270 U 0.270 2 Ref. 13, pp. 35, 929

- 935, 945

- 946, 997, 1025

Fluoranthene 0.270 U 0.270 2 Ref. 13, pp. 35, 929

- 935, 945

- 946,
99 8 , 1025

Phenanthrene 0.270 U 0.270 2 Ref. 13, pp. 35, 929

- 935, 945

- 946, 997, 1025
Pyrene 0.270 U 0.270 2 Ref. 13, pp. 35, 929

- 935, 945

- 946,
99 8 , 1025

Anthracene 0.270 U 0.270 2 Ref. 13, pp. 3 4 , 929

- 935, 945

- 946,
99 8 , 1025
Arsenic

DSE

- 21/ 24”
MF6AM3 5.6 1.1 2 Ref. 13, pp. 34, 899

- 903, 911, 915 Chromium 16.3 1.1 2 Ref. 13, pp. 34, 899

- 903, 911, 915 Cadmium 0.31 LJ 0.56 2 Ref. 13, pp. 34, 899

- 903, 911, 915
Lead 35.6 1.1 2 Ref. 13, pp. 34, 899

- 903, 911, 915 Manganese 135 (167.4) J * 1.7 2 Ref. 13, pp. 34, 899

- 906 , 911, 915 Mercury 0.086 LJ 0.15 2 Ref. 13, pp. 34, 899

- 903, 911, 915SW Pathway

– Likelihood of Release

Sediment

– Company
Canal Station
Location/ Sample ID Concen tration mg/kg Quantitation
Limit 1
mg/kg

HRS Documentation Record 

### 45 Delta Shipyard
LAD058475419 Arsenic
CC

- 01

- 03

- 611/
MF6AL0 24.0 1.8 3 Ref. 13, pp. 132

- 135, 299, 379 Lead 20.9 1.8 3 Ref. 13, pp. 132

- 135, 299, 379 Chromium 9.8 1.8 3 Ref. 13, pp. 132

- 135, 298 , 379 Zinc 80.9 3.6 3 Ref. 13, pp. 132

- 135, 298 , 379

Fluoranthene CC

- 01

- 03

- 611/
F6AL0 0.33 U 0.33 2 Ref. 13, pp. 1048

- 1052, 1055, 1095, 1112

Pyrene 0.33 U 0.33 2 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, p p . 9 38, 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, p p

. 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 .90 6 ). 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 (C RQL) and Contract Required Detection Limit (CRDL) terminology used by the CLP Laboratory are based on detection limits that have b een adjusted for sample aliquot, sample volume, and dilutions for the analysis (Ref. 1, Section 1.1, Table 2

- 3; Ref. 13, p p . 134

- 135 ; Ref. 29).

2 Quantitation limit provided is an adjusted CRQL ( Ref. 1 3, pp. 905, 937 ; Ref. 29 ).

3 Quant itation 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 0.22 1

277.8
633
0.81
Wetland at 24 Sediment Ethylben z ene 0.0081 U 0.0081
inches bgs o- Xy l ene 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 0.258SW 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

Note s : U Not detected at reported quantitation limit (Ref. 13, p p

. 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, 90 6 ). There is an unknown bias associated with these concentrations

. L Reported concentratio n between the MDL and the CRQL (Ref. 13, p. 90 6 ). There is no bias associated with these concentrations.

1 S ince 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:

S amples 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 S ite has a concentration exceed ing 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 ). S ampling locations with hazardous substances meeting
observed rel ease criteria are presented below.

EPA Reassessment Sampling Event – August 2012

Station Location

(Sample ID ) Sampl e 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 , 4 23

, 496,
499 ; Ref. 16, p. 24

DSE

- 05
12 ” (MF6 AG2 /F6A G2 )
24 ” (MF6A G3 /F6A G3 ) North of Pit 1, within wetland 08/08/2012 ( 0940 ) Ref. 13, pp. 116, 126

, 590, 752

, 8 71

, 1016

, 1018 ; Ref. 16, p. 24

DSE

- 05

- Duplicate
24 ” (MF6A G7 /F6A G7 ) 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 ” (MF6A D3 /F6A D3 )
24 ” (MF6A D4 /F6A D4 ) 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 ” (MF6A D9 /F6A D9 ) 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 , 10 20

, 1023 ; Ref. 16, p. 24

DSE

- 14
24 ” (MF6A L8) 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 sedi ment 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, P esticides, 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 , P esticides

, 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 CRQL 1 mg/kg Reference

DSE

- 04/ 24” (MF6AA1) Arsenic 27.6 1.0 Ref. 13, pp. 30

, 386

- 388, 395 , 41 4 , 423

DSE

- 05 / 12 ” (MF6AG2) Chromium 431 0.99 Ref. 13, pp. 14, 76 4

- 76 8 , 77 9 , 7 90 , 79 5
Lead 791 0.99 Ref. 13, pp. 14, 76 4- 76 8 , 77 9 , 7 90

, 79 5 Mercury 1.2 0.13 Ref. 13, pp. 14, 76 4

- 76 8 , 77 9 , 7 90

, 795

DSE

- 05/ 24 ” (F6AG3) Naphthalene 2.0 1.2 Ref. 13, pp. 31, 92 9

- 93 5 , 93 9

, 97 5 , 101 6
2

- Methylnaphthalene 6.2 1.2 Ref. 13, pp. 3 0

, 92 9- 93 5 , 93 9 , 97 5 , 101 6
Fluorene 1.5 1.2 Ref. 13, pp. 31, 92 9

- 93 5 , 9 40 , 97 5 , 101 6

DSE

- 05/ 24 ” (MF6AG3) Arsenic 23.6 1.0 Ref. 13, pp. 30, 76 4

- 76 8

, 7 80

, 7 90

, 79 5

Cadmium 5.1 J+ (3.62) 2 0.51 Ref. 13, pp. 30, 76 4

- 76 8 , 7 80

, 7 91

, 79 5

, 798, 801

- 802
Chromium 584 1.0 Ref. 13, pp. 30, 76 4- 76 8

, 7 80 , 7 91 , 79 5
Lead 761 1.0 Ref. 13, pp. 30, 76 4- 76 8

, 7 80 , 7 91 , 79 5 Manganese 5 6 9 1.5 Ref. 13, pp. 30, 76 4- 76 8

, 7 80 , 7 91 , 79 5

Mercury 2.0 0.12 Ref. 13, pp. 30, 76 4- 76 8

, 7 80 , 7 91 , 79 5

DSE

- 05/ 24 ” Duplicate (F6AG7) Ethylben z ene 1.8 0.45 Ref. 13 pp. 43, 929

- 935

, 95 2

, 95 9

, 101 9

o

- Xy l ene 3.9 0.45 Ref. 13 pp. 43, 929

- 935

, 95 2 , 95 9

, 101 9

m,p

- Xylene 9.7 0.45 Ref. 13 pp. 43, 929

- 935

, 95 2 , 95 9

, 101 9 Isopropylbenzene 0.8 0.45 Ref. 13 pp. 43, 929

- 935

, 95 2 , 95 9

, 101 9 Naphthalene 130 J 1 59.0 Ref. 13 pp. 43, 929

- 935

, 9 50

, 98 3

, 101 7
2

- Methylnaphthalene 400 J 1 59.0 Ref. 13 pp. 4 2

, 929

- 935

, 9 50

, 98 3

, 101 7
Fluorene 45.0 J 1 5.9 Ref. 13 pp. 43, 929

- 935

, 9 51

, 98 2

, 101 7
Phenanthrene 58.0 J 1 5.9 Ref. 13 pp. 43, 929

- 935

, 9 51

, 98 3

, 101 7

Anthracene 7.2 J 1 5.9 Ref. 13 pp. 4 2

, 929

- 935

, 9 51

, 98 3

, 101 7

DSE

- 05/ 24 ” Duplicate (MF6AG7) Arsenic 37.4 1.0 Ref. 13, pp. 42, 76 4- 76 8

, 78 4

, 79 2

, 79 6

Cadmium 8.5 J+ (6.03) 2 0.50 Ref. 13, pp. 42, 76 4

- 76 8

, 78 4 , 79 2 , 79 6

, 798, 801

- 802
Chromium 337 1.0 Ref. 13, pp. 42, 76 4

- 76 8

, 78 4 , 79 2 , 79 6
Lead 1,030 1.0 Ref. 13, pp. 42, 76 4- 76 8

, 78 4 , 79 2 , 79 6 Manganese 866 1.5 Ref. 13, pp. 42, 76 4

- 76 8

, 78 4 , 79 2 , 79 6

DSE

- 06/ 1 2 ” (M F6AD3) Mercury 0.84 0.11 Ref. 13, pp. 14, 710

- 717 , 72 6

, 742 , 7 50

DSE

- 06/ 24 ” (F6AD4) Benzo(g,h,i)perylene 0.32 0.21 Ref. 13, pp. 3 1

, 506

- 510 , 515, 5 48, 587
Fluoranthene 0.37 0.21 Ref. 13, pp. 3 1 , 506

- 510, 515, 548, 587
Phenanthrene 0.28 0.21 Ref. 13, pp. 3 1 , 506

- 510, 515, 548, 587 Pyrene 0.38 0.21 Ref. 13, pp. 3 1 , 506

- 510, 515, 548, 587

DSE

- 06/ 24 ” (MF6AD4) Cadmium 1.6 0.45 Ref. 13, pp. 30, 710

- 717

, 72 7 , 74 2 , 7 50
Lead 258 0.91 Ref. 13, pp. 30, 710

- 717 , 72 7 , 74 2 , 7 50

DSE

- 08 / 24 ” (MF6AD9) Arsenic 19.3 J 0.92 Ref. 13, pp. 30, 710

- 717

, 73 2

, 744 , 7 51
Lead 162 0.92 Ref. 13, pp. 30, 710

- 717

, 73 2

, 7 4 4 , 7 51

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 , 90 7 , 91 5 Manganese 1,910 J 1.5 Ref . 13, pp. 32, 899

- 906 , 907, 915SW Pathway

– Likelihood of Release

HRS Documentation Record 

### 49 Delta Shipyard
LAD058475419 Station Location

(Sample ID) Hazardous
Substance Concentration mg/kg Adjusted CRQL 1 mg/kg Reference

DSE

- 14 / 24 ” (MF6AL8) Manganese 578 J 1.7 Ref. 13, pp. 32, 900

- 90 6 , 90 9 , 91 6

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, p p

. 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, p p

. 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
Limit 1 mg/kg Reference

CC

- 02

- 03

- 612 ( MF6AK9/ F6AK9) Lead 89.6 2.4 3 Ref. 13, pp. 132

- 135, 29 7 , 379
Chromium 105 2.4 3 Ref. 13, pp. 132

- 135, 29 7 , 379
Zinc 567 4.7 3 Ref. 13, pp. 132

- 135, 29 7 , 379

Fluoranthene 0.480 0.410 2 Ref. 13, pp. 1048

- 1052

, 105 9

, 1094,
111 2

Pyrene 0.420 0.410 2 Ref. 13, pp. 1048

- 1052 , 105 9

, 1094,
111 2

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 Limi t (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, p p . 134

- 135 ; Ref. 29).

2 Quantitation limit provided is an adjusted CRQL ( Ref. 13, p. 1054 ; Ref. 29 ).

3 Quant itation 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 S ite contain hazardous substance concentrations above their background levels , the sampling conducted at the S ite in 2012 further supports observed release by chemical analysis and attribution to the site

.

T he background sample s collected at the S ite are deemed appropriate background sample s for the purposes of evaluating the S ite under the HRS because the analytical results from the background sample s 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 S ite displ ayed 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 bodi es that are seasonally tidally influenced

, there is no
documentation to indicate that there is tidal carry from other poss ible downgradient sources.SW Pathway

– Likelihood of Release

HRS Documentation Record 

### 50 Delta Shipyard
LAD058475419 

### The S ite 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 EnviroM apper and Envirofacts database s w as performed within the zip code of the S ite 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) . N o nearby facilities along the surface water pathway are reported to have had a release of arsenic, antimony, anthracene, benzene, cadmium, ch romium, 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 release s have been established through direct observation and chemica l 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

- xylen e, 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 V alue: 550SW 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 release s to su rface 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 a nd 4 ). Arsenic, anthracene, cadmium, chromium, ethylbenzene, fluorene, lead, manganese, mercury, 2

- methylnaphthalene, naph thalene, phenanthrene, pyrene, o- xylene, and m,p

xylene 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 merc ury as shown below.

Hazardous
Substance Source
Number Toxicity
Factor
Value Persistence
Factor Value 1 Bioaccumulation
Factor Value

Fresh Water 2 Toxicity/
Persistence/
Bioaccumulation

Factor Value Reference

Anthracene 1,2,3, OR 10 0.4 50,000 2 x 10 5 Ref. 2, p. 9
Antimony 1,2, OR 10,000 1 5 5 x 10 4 Ref. 2, p. 9

Arsenic 1,2,3,4, OR 10,000 1 5 5 x 10 4 Ref. 2, p. 9

Benzene 1,2, OR 1,000 0.4 5,000 2 x 10 6 Ref. 2, p. 10

Cadmium 1,2,3,4, OR 10,000 1 50 ,000 5 x 10 8 Ref. 2, p. 10

Chromium 1,2,3,4, OR 10,000 1 5 5 x 10 4 Ref. 2, p. 11

Ethylb enzene 1, 2,3, OR 10 0.4 50 2 x 10 2 Ref. 2, p. 13

Fluorene 1,2,3,4, OR 100 0.4 500 2 x 10 4 Ref. 2, p. 13

Lead 1,2,3,4, OR 10,000 1 5, 000 5 x 10 7 Ref. 2, p. 15

Manganese 1,2,3,4, OR 10,000 1 5 00 5 x 10 6 Ref. 2, p. 15

Mercury 1,2,3,4, OR 10,000 1 50,000 5 x 10 8 Ref. 2, p. 15

2

- Methyl

naphthalene 1,2,3,4, OR 1,000 0.4 50,000 2 x 10 7 Ref. 2, p. 15

Naphthalene 1,2,3,4, OR 1,000 0.4 50,000 2 x 10 7 Ref. 2, p. 15

Phenanthrene 1,2,3,4, OR 1 0.4 5,000 2 x 10 3 Ref. 2, p. 16

Pyrene 1,2,3, OR 100 1 50,000 5 x 10 6 Ref. 2, p. 16

o- Xylene 1,2,3, OR 100 0.4 50 2 x 10 3 Ref. 2, p. 18

m

- Xylene 1, 2,3, OR 100 0.4 50 0 2 x 10 4 Ref. 2, p. 18

p

- Xylene 1,2,3, OR 100 0.4 50 2 x 10 3 Ref. 2, p. 18

Zinc 1,2,3,4,OR 10 1 500 5 x 10 3 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 haz ardous substances persistence factor value (Ref. 1, Sect. 4.1.2.2.1.2). The persistence values we re 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 10 8SW 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 > 6,60 5.768 NE 10 NE NE

NE = Not Evaluated



### A hazardous waste quantity of 6,605.781 is estimated for the sources at the Delta Shipyard S ite

, 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
10 6 

### (maximum of 1 x 10 8 

### according to HRS Section 4.1.3.2.3)

1 x 10 6 

### (To xicity/Persistence Factor Value x Hazardous Waste Quantity Factor Value) x 50,000 (Bioaccumulation Potential Factor Value) = 5 x 10 10 

### (maximum of 1 x 10 12 

### 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 10 10 

### is 320.

Hazardous Waste Quantity Assigned Value: 100

Waste Characteristics Factor Category Value: 320SW 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; Re f . 28, p. 1).

Fishery Type of Surface Water Body Reference(s)

Company Canal (Houma Navigation Canal) Large Stream to River Ref. 26 ; Ref. 28



### O bserved release s 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).
T his information documents an observed release of several hazardous substance s 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). T here is a lso a fishery present
within the TDL ; therefore a food c hain 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 concentration s 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: 0SW 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 (P i ) Dilution Weight (D i ) P i x D i

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 0.0 00 0 3

Note s: 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 wa ter 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 classi fied 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 P i 

### x D i 

### = 0.03 x 0.001

Product of P i 

### x D i 

### : 0.00 00 3

(Sum of Products of P i 

### x D i 

### )/10: 0.000003SW 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 ha ve been established based on direct observation and chemical analyses of samples collected from this source (refer to the Attribution section and Section s 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 high est combined values are mercury , cadmium and pyrene as shown below.

Hazardous
Substance Source
Number Ecotoxicity
Factor
Value

Fresh 2 Persistence 1

Factor
Value Ecosystem
Bioaccumulation
Potential Factor
Value

Fresh Water 2 Ecotoxicity/
Persistence/
Bioaccumulation

Factor Value Reference

Anthracene 1,2,3, OR 10,000 0.4 50,000 2 x 10 8 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 10 5 Ref. 2, p. 9

Benzene 1,2, OR 1,000 0.4 5,000 2 x 10 6 Ref. 2, p. 10

Cadmium 1,2,3,4, OR 10,000 1 50,000 5 x 10 8 Ref. 2, p. 10

Chromium 1,2,3,4, OR 10,000 1 500 5 x 10 6 Ref. 2, p. 11

Ethylb enzene 1, 2,3, OR 10 0 0.4 50 2 x 10 3 Ref. 2, p. 1 3

Fluorene 1,2,3,4, OR 1, 00 0 0.4 5,000 2 x 10 6 Ref. 2, p. 1 3

Lead 1,2,3,4, OR 1 ,000 1 50,000 5 x 10 7 Ref. 2, p. 1 5

Manganese 1,2,3,4, OR 100 1 50,000 5 x 10 6 Ref. 2, p. 1 5

Mercury 1,2,3,4, OR 10,000 1 50,000 5 x 10 8 Ref. 2, p. 1 5

2

- Methyl

naphthalene 1,2,3,4, OR 100 0.4 50,000 2 x 10 6 Ref. 2, p. 1 5

Naphthalene 1,2,3,4, OR 1,000 0.4 50,000 2 x 10 7 Ref. 2, p. 1 5

Phenanthrene 1,2,3,4, OR 10,000 0.4 50,000 2 x 10 8 Ref. 2, p. 1 6

Pyrene 1,2,3, OR 10,000 1 50,000 5 x 10 8 Ref. 2, p. 1 6

o- Xylene 1,2,3, OR 100 0.4 50 2 x 10 3 Ref. 2, p. 1 8

m

- Xylene 1, 2,3, OR 100 0.4 50 0 2 x 10 4 Ref. 2, p. 1 8

p

- Xylene 1,2,3, OR 100 0.4 50 2 x 10 3 Ref. 2, p. 18

Zinc 1,2,3,4,OR 10 1 50,000 5 x 10 5 Ref. 2, p. 1 8

Notes: OR
– Observed Release

1 The surface water category that includes rivers, oceans, coastal tidal waters, and great lakes was utilized to assign the haz ardous 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 Fac tor Value: 5 x 10 8SW 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, 60 5

. 768 NE 10 NE NE

NE = Not Evaluated



### A hazardous waste quantity of 6,605.768 is estimated for sources at the Delta Shipyard S ite 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
10 6 

### (maximum of 1 x 10 8 

### according to HRS Section 4.1.4.2.3)

1 x 10 6 

### ( Ecotoxicity/Persistence Factor Value x Hazardous Waste Quantity Factor Value) x 50,000 (Bioaccumulation Potential Factor Value) = 5 x 10 10 

### (maximum of 1 x 10 12 

### 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 a n eco toxicity/persistence value of 10,000 and a n 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 10 10 

### is 320.

Hazardous Waste Quantity Assigned Value: 100

Waste Characteristics Factor Category Value: 320SW 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. 2 4 , pp. 1 -3 ). T he 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 wetlan d 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

W etland Value (Ref. 1, Table 4-24): 25

Level II Concentrations Factor Value: 25SW 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, p p . 4 , 9 ). T he 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 wetlan d s 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 c anal as a large stream to river according to HRS (Re f . 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: 0.05HRS 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.1Residential 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 SCALE PROJECT NO DATE 

### US EPA REGION 6 LOUISIANA

REF. 12, P. 30; REF. 13, PP. 2-10; REF. 30, P. 4!(

# *

# *

# *

#

* Houma Navigational Canal Bayou La CarpeCompany 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 SCALE PROJECT NO DATE 

### 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. 2815-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 SCALE PROJECT NO DATE 

### 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 CanalPIT1

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 SCALE PROJECT NO DATE 

### 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.