Appendix C 

Sediment and Water Quality 

August 2012
Appendix C, Yaquina River ODMDS Evaluation/EA

Appendix C 

Sediment and Water Quality 

Table of Contents 

General .......................................................................................................................................... C-1

Yaquina Bay and River Federal Navigation Project ..................................................................... C-1

Water Quality ............................................................................................................................ C-3

Baseline Sediment Quality ........................................................................................................ C-3

2010 Sediment Quality Results and Discussion ........................................................................ C-3

Yaquina Bay Ocean Disposal Sites ............................................................................................... C-9

Disposal Volumes ..................................................................................................................... C-9

Sediment Baseline Analysis .................................................................................................... C-11

Discussion and Conclusions ........................................................................................................ C-25

References ................................................................................................................................... C-26

LIST OF FIGURES 

Figure C-1. Yaquina North and South Ocean Disposal Sites ...................................................... C-2

Figure C-2. Location of Sediment Samples Collected on July 28, 2010 ..................................... C-4

Figure C-3. Sediment Sampling Sites, June and August 2008 ................................................... C-13

Figure C-4. Mean Grain Size, June 2008 ................................................................................... C-14

LIST OF TABLES 

Table C-1. Physical Grain Size, 2010 .......................................................................................... C-5

Table C-2. Metals and Total Organic Carbon, 2010 .................................................................... C-5

Table C-3. Pesticides, 2010 .......................................................................................................... C-6

Table C-4. Polychlorinated Biphenyls (PCBs), 2010 .................................................................. C-6

Table C-5. Chlorinated Hydrocarbons, 2010 ............................................................................... C-6

Table C-6. Phthalates, 2010 ......................................................................................................... C-7

Table C-7. Phenols, 2010 ............................................................................................................. C-7

Table C-8. Miscellaneous Extractables, 2010 .............................................................................. C-7

Table C-9. PAHs - Low Molecular Weight Analytes, 2010 ........................................................ C-8

Table C-10. PAHs - High Molecular Weight Analytes, 2010 ..................................................... C-8

Table C-11. Total Petroleum Hydrocarbons, 2010 ...................................................................... C-8

Table C-12. Butyltins, 2010 ......................................................................................................... C-9

Table C-13. Volume of Dredged Material Placed at Yaquina Bay Ocean Disposal Sites ......... C-10

Table C-14. Results for Grain Size, Total Solids, and TOC, 2008 ............................................ C-16

Table C-15. Results for Metals, 2008 (ppm) .............................................................................. C-17

Table C-16. Results for Organotin, 2008 (μg/L) ....................................................................... C-19

Table C-17. Results for SVOCs, 2008 (μg/kg) .......................................................................... C-20

Table C-18. Results for PCBs, 2008 (μg/kg) ............................................................................. C-23

Table C-19. Results for Pesticides, 2008 (μg/kg) ...................................................................... C-24
Appendix C, Yaquina River ODMDS Evaluation/EA C-1

Appendix C 

Sediment and Water Quality 

GENERAL

The Marine Protection, Research and Sanctuaries Act (MPRSA) requires that four general criteria and 

eleven specific factors be addressed during the designation process (40 CFR 228.5 and 228.6). 

General criterion (b) and specific factors 4, 9, and 10 of 40 CFR 228.5 and 228.6 require sediment and 

water quality analyses indicative of both the dredging areas and disposal sites be reported. Dredged 

materials placed in ocean dredged material disposal sites (ODMDS) along the Oregon Coast usually 

consist of medium to fine sands taken from entrance bar shoals and deposited on slightly finer 

continental shelf sands. The bulk of the sediments dredged at the U.S. Army Corps of Engineers 

(USACE) Yaquina federal navigation project and placed in the ocean disposal sites are similar in grain 

size to those at the disposal sites. Because of their coarse nature, the presence of strong hydraulic 

regimes, similarity to ODMDS sediments, and isolation from known or historical contaminant sources, 

dredged sands from entrance bar shoals are often deemed acceptable for ocean disposal without further 

testing (40 CFR 227.13(b)). The use of Sediment Evaluation Framework (SEF) screening levels 

provides an additional safeguard for this material. Data for channel sands and fines for the navigation 

project and the North and South ocean disposal sites (Figure C-1) are presented in this appendix. 

The general criteria and specific factors of the MPRSA have been interpreted as 27 different “areas of 

consideration” that cover the ocean disposal sites and the dredged material they receive. These areas 

of consideration are listed in a conflict matrix (see Evaluation Study/EA report) that is used to evaluate 

each disposal site on its compliance with the requirements for disposal site designation. The results of 

the matrix are compared and used to select the best ocean disposal site(s). The areas of consideration 

involving sediment quality include: 

1. Physical and chemical sediment compatibility. 

2. Water column chemistry and physical characteristics. 

3. Influence of past disposal. 

4. Size and shape of the disposal site. 

5. Size of the buffer zone. 

6. Degraded areas. 

7. Potential for cumulative effects. 

This information is provided in this appendix.

YAQUINA BAY AND RIVER FEDERAL NAVIGATION PROJECT

The federal navigation project at Yaquina includes an entrance channel that is 400-feet wide and 40-

feet deep that runs from river mile (RM) -1.2 to RM 0.0. From RM 0.0, the authorized channel is 30-

feet deep and 300-feet wide to the turning basin at McClean Point (RM 2.0). The turning basin is 

authorized at 30-feet deep, 900 to 1,200-feet wide, and 1,400-feet long. The authorized channel from 

the turning basin to RM 4.0 is 18-feet deep and 200-feet wide; this channel is currently not 

maintained. 

 
Appendix C, Yaquina River ODMDS Evaluation/EA C-2

Figure C-1. Yaquina North and South Ocean Disposal Sites 

 
Appendix C, Yaquina River ODMDS Evaluation/EA C-3

The federal project at Yaquina includes a small, 10-foot deep boat basin (“north basin”) at Newport. 

East of the Highway 101 bridge is the South Beach marina with an authorized access channel that is 

10-feet deep, 100-feet wide, and 2,035-feet long. The project in the Yaquina River consists of a 

channel that is generally 150-feet wide and 10-feet deep from about RM 4.0 to RM 14.0. At Toledo, 

the channel widens to 200 feet and extends into Depot Slough. A turning basin at RM 14.0 that is 

350-feet wide and 500-feet long completes the authorized project. 

Sediment testing in Yaquina Bay and river for the federal navigation projects has been done in 1980, 

1986, 1990, 1991, 1995, 2000, 2005, and 2010 for the Yaquina Bay and River federal navigation 

project. The Sediment Evaluation Framework (SEF 2009) guidance manual used by federal and state 

permitting agencies in Oregon for evaluating the potential for unconfined in-water disposal of dredge 

material recommends physical and chemical testing of the sediments found in the federal navigation 

project area every 7 to 10 years, depending on location. However, the USACE has chosen to collect 

sediments and analyze their physical and chemical properties typically on a 5-year schedule or as 

specific sediment quality issues are raised. Information and specific data regarding these sediment 

quality evaluations are maintained and available at the USACE Portland District.1

 For the most recent 

sediment sampling effort in 2010, specific sample locations and physical/chemical data is provided in 

detail in this appendix. 

Water Quality 

Water quality in nearshore waters at Yaquina Bay is expected to be typical for seawater in the Pacific 

Ocean. A large data set regarding the impact of dredged material disposal on the water column was 

collected in the early 1980s. In June 1980, the U.S. Geological Survey collected samples from 14 

stations offshore at Yaquina Bay and conducted elutriate tests (see Fuhrer and Rinella 1983). All 

parameters measured were well within normal ranges expected for nearshore ocean waters and met the 

state’s water quality standards. Since then, focus has shifted away from the water column pathway to 

one having more direct contact with bulk or suspended sediment. Currently, water column tests are 

rarely performed unless there is a “reason to believe” a water column release may occur. 

Baseline Sediment Quality 

The Corps conducted physical and chemical analyses of sediment samples from Yaquina Bay and 

South Beach marina in 1980, 1986, 1990, 1991, 1995, 2000, 2005, and 2010). Potential sources of 

contaminants to the federal navigation channel are logging, wood processing, fish processing and 

urban runoff. From the USACE sediment sampling studies, the sediment is typically below screening 

levels (if they were identified at that time) for contaminants of concern. Consequently, sediment has 

been acceptable for in-water ocean disposal. 

2010 Sediment Quality Results and Discussion 

The latest sediment sampling effort at Yaquina Bay occurred on July 28, 2010 (USACE September 

2010). The evaluation was conducted following procedures set forth in the SEF (2009), which is 

consistent with the federal guidance in the Ocean Testing Manual (USACE and EPA 1991) and Inland 

Testing Manual (EPA and USACE 1998). The 2009 SEF was developed jointly with regional federal 

and state agencies to address environmental issues associated with dredging and sediment 

management. 

 

1

 All sediment analysis reports conducted by the USACE for the federal navigation project can be found at 

http://www.nwp.usace.army.mil/environment/sediment.asp. 
Appendix C, Yaquina River ODMDS Evaluation/EA C-4

Eight box core grab samples and one gravity core sample were collected in 2010: two from the 

entrance channel, four from the federal navigation channel, and three from South Beach marina 

(Figure C-2). Based upon grain size and sample location 5 out of the 9 samples were subjected to 

chemical analyses. Results are discussed below. 

Figure C-2. Location of Sediment Samples Collected on July 28, 2010 

 
Appendix C, Yaquina River ODMDS Evaluation/EA C-5

Physical Grain Size (ASTM D422). Nine sediment samples were submitted for physical analyses with 

data presented in Table C-1. The overall mean grain size for the project is 72% sand, with a mean 

grain size of 94% sand for the federal navigation channel (entrance to turning basin) and 45% sand 

within South Beach marina. 

Table C-1. Physical Grain Size, 2010 

Location Sample ID Gravel Sand Fines 

% 

Entrance 072810YAQB-BC-01 0 99.1 1 

072810YAQB-BC-02 0 99 0.9 

River (navigation channel) 

072810YAQB-BC-03 0 98.7 1.3 

072810YAQB-BC-04 0 93.9 6 

072810YAQB-BC-05 0 89.3 10.6 

072810YAQB-GC-07 0 85.4 14.7 

South Beach Marina 

072810YAQB-BC-08 0.2 63.1 36.8 

072810YAQB-BC-09 0.4 20.4 79.3 

072810YAQB-BC-10 0.7 15.6 83.8 

Metals (EPA method 6020/7471), Total Organic Carbon (EPA method 9060). Five sediment samples 

were submitted for metals and total organic carbon (TOC) testing, with data presented in Table C-2. 

Total organic carbon averaged 2.36% and had a range of 0.774% to 3.63%. Levels of metals were 

consistent with historical values and did not approach the SEF screening levels (SLs). 

Table C-2. Metals and Total Organic Carbon, 2010 

Sample I.D. As Sb Cd Cr Cu Pb Hg Ni Ag Zn TOC 

mg/kg (ppm) % 

072810YAQB-BC-05 <7 <0.3 <0.3 28.2 6.3 4 <0.03 20 <0.4 40 0.774 

072810YAQB-GC-07 <7 <0.3 <0.3 28.9 8.7 4 <0.03 22 <0.4 39 2.03 

072810YAQB-BC-08 <8 <0.3 0.4 36.6 14.9 6 <0.04 28 <0.5 56 2.35 

072810YAQB-BC-09 <10 <0.5 0.9 52 32.4 10 0.06 42 <0.7 97 3.02 

072810YAQB-BC-10 <10 <0.5 1.2 57 39.8 11 0.05 43 <0.7 111 3.63 

Marine Screening Level (SL) 57 150 5.1 260 390 450 0.41 -- 6.1 410 -- 

 -- = SL not established. 

 (<) = Non-detect (ND) at the value listed (MRL). 

Pesticides/PCBs (EPA method 8081/8082). Five sediment samples were submitted for pesticides/ 

polychlorinated biphenyls (PCBs), with data presented in Tables C-3 and C-4. No pesticides or PCBs 

were detected in any of the samples above the laboratory method reporting limits. All method 

reporting limits (MRLs) were well below the SEF SLs. 

 
Appendix C, Yaquina River ODMDS Evaluation/EA C-6

Table C-3. Pesticides, 2010 

Sample I.D. 

4,4’- 

DDD 

4,4’- 

DDE 

4,4’- 

DDT Aldrin Chlordane Dieldrin Heptachlor gammaAlpha Gamma* BHC 

ug/kg (ppb)

072810YAQB-BC-05 <1.9 <1.9 <1.9 11Y <0.96 <0.96 <1.9 <0.96 <0.96 

072810YAQB-GC-07 <2.0 <2.0 <2.0 <0.98 <0.98 <0.98 <2.0 <0.98 <0.98 

072810YAQB-BC-08 <1.9 <1.9 <1.9 <0.97 <0.97 <0.97 <1.9 <0.97 <0.97 

072810YAQB-BC-09 <2.0 <2.0 <2.0 <0.98 <0.98 <0.98 <2.0 <0.98 <0.98 

072810YAQB-BC-10 <2.0 <2.0 <2.0 <0.98 <0.98 <0.98 <2.0 <0.98 <0.98 

Marine SL 16 9.0 34 -- -- -- -- -- 

* Gamma-chlordane may also be called beta-chlordane or trans-chlordane 

-- SL not established. 

 (<) = Non-detect (ND) at the value listed (MRL). 

 Y = The analyte was not detected at or above the reported concentration. The MRL was raised due to 

chromatographic interference. 

Table C-4. Polychlorinated Biphenyls (PCBs), 2010 

Sample I.D. 

Aroclor 

1016 

Aroclor 

1221 

Aroclor

1232 

Aroclor

1242 

Aroclor

1248 

Aroclor

1254 

Aroclor 

1260 Total 

ug/kg (ppb) 

072810YAQB-BC-05 <9.5 <9.5 <9.5 <9.5 <9.5 <9.5 <9.5 <9.5 

072810YAQB-GC-07 <9.9 <9.9 <9.9 <9.9 <12Y 26 <9.9 26Y 

072810YAQB-BC-08 <9.7 <9.7 <9.7 <9.7 <9.7 <9.7 <9.7 <9.7 

072810YAQB-BC-09 <9.9 <9.9 <9.9 <9.9 <9.9 <9.9 <9.9 <9.9 

072810YAQB-BC-10 <9.8 <9.8 <9.8 <9.8 <9.8 <9.8 <9.8 <9.8 

Marine SL 130 

Symbol (<) = Non-detect (ND) at the value listed (MRL). 

Y = The analyte was not detected at or above the reported concentration. The MRL was raised due to 

chromatographic interference. 

Chlorinated Hydrocarbons, Phenols, Phthalates and Miscellaneous Extractables (EPA method 8270). 

Five sediment samples were submitted for chlorinated hydrocarbons, phenols, phthalates and 

miscellaneous extractables, with data presented in Tables C-5 to C-8. No chlorinated hydrocarbons or 

miscellaneous extractables were detected above MRLs in any of the samples. Bis(2-ethylhexyl) 

phthalate and phenol were detected in all samples, but below SEF marine SLs. Only one sample 

contained any other detected organic contaminant with an estimated concentration of 15 parts per 

billion (ppb) 4-methyl phenol, which is well below the SEF marine SL of 670 ppb. All MRLs were 

well below SEF SLs. 

Table C-5. Chlorinated Hydrocarbons, 2010 

Sample I.D. Hexachlorobenzene 1,2,4-Trichlorobenzene 1,2-Dichlorobenzene 1,4-Dichlorobenzene

ug/kg (ppb) 

072810YAQB-BC-05 <0.96 <19 <19 <19 

072810YAQB-GC-07 <1.7Y <20 <20 <20 

072810YAQB-BC-08 <0.97 <20 <20 <20 

072810YAQB-BC-09 <0.98 <20 <20 <20 

072810YAQB-BC-10 <0.98 <20 <20 <20 

Marine SL 22 31 35 110 

Symbol (<) = Non-detect (ND) at the value listed (MRL). 

Y = The analyte was not detected at or above the reported concentration. The MRL was raised due to chromatographic 

interference. 
Appendix C, Yaquina River ODMDS Evaluation/EA C-7

Table C-6. Phthalates, 2010 

Sample I.D. 

bis(2-Ethylhexyl) 

phthalate 

Butyl-benzylphthalate Di-n-butylphthalate Di-n-octyl 

phthalate 

Diethylphthalate Dimethylphthalate 

ug/kg (ppb) 

072810YAQB-BC-05 16J <19 <19 <19 <19 <19 

072810YAQB-GC-07 1,300 <20 <20 <20 <20 <20 

072810YAQB-BC-08 48 <20 <20 <20 <20 <20 

072810YAQB-BC-09 80 <20 <20 <20 <20 <20 

072810YAQB-BC-10 92 <20 <20 <20 <20 <20 

Marine SL 1,300 63 1,400 6,200 200 71 

Symbol (<) = Non-detect (ND) at the value listed (MRL). 

J= The estimated concentration is less than the established MRL. 

Table C-7. Phenols, 2010 

Sample I.D. Phenol 2-Methyl 

phenol 

Pentachloro 

phenol 

4-Methyl 

phenol 

2,4-Dimethyl

phenol 

ug/kg (ppb)

072810YAQB-BC-05 36 <19 <97 15J <19 

072810YAQB-GC-07 29 <20 <99 <20 <20 

072810YAQB-BC-08 33 <20 <99 <20 <20 

072810YAQB-BC-09 36 <20 <98 <20 <20 

072810YAQB-BC-10 39 <20 <99 <20 <20 

Marine SL 420 63 400 670 29 

Symbol (<) = Non-detect (ND) at the value listed (MRL). 

J= The estimated concentration is less than the established MRL. 

Table C-8. Miscellaneous Extractables, 2010 

Sample I.D. 

Hexachlorobutadiene Benzoic 

Acid 

Benzyl 

Alcohol Dibenzofuran N-Nitroso diphenylamine 

ug/kg (ppb)

072810YAQB-BC-05 <0.96 <190 <19 <19 <19 

072810YAQB-GC-07 <0.98 <200 <20 <20 <20 

072810YAQB-BC-08 <0.97 <200 <20 <20 <20 

072810YAQB-BC-09 <0.98 <200 <20 <20 <20 

072810YAQB-BC-10 <0.98 <200 <20 <20 <20 

Marine SL 11 650 57 540 28 

Symbol (<) = Non-detect (ND) at the value listed (MRL). 

Polynuclear Aromatic Hydrocarbons (EPA method 8270C). Five sediment samples were submitted 

for low and high molecular weight polynuclear aromatic hydrocarbons (PAHs), with data presented in 

Tables C-9 and C-10. Phenanthrene, a low molecular weight PAH, was detected in very low 

concentrations (21-46 pbb) in samples collected from the South Beach marina, well below the SEF 

marine SL of 1,500 ppb. Several high PAHs were detected in some of the samples. All detected 

values and MRLs were low and well below SEF SLs. 

 
Appendix C, Yaquina River ODMDS Evaluation/EA C-8

Table C-9. PAHs - Low Molecular Weight Analytes, 2010 

Sample I.D. 

Acenaphthene Acenaphthylene Anthracene Fluorene 2-Methyl 

naphthalene Naphthalene Phenanthrene 

Total Low

PAHs 

ug/kg (ppb) 

072810YAQB-BC-05 <19 <19 <19 <19 <19 <19 <19 <19 

072810YAQB-GC-07 <20 <20 <20 <20 <20 <20 <20 <20 

072810YAQB-BC-08 <20 <20 <20 <20 <20 <20 46 46 

072810YAQB-BC-09 <20 <20 <20 <20 <20 <20 21 21 

072810YAQB-BC-10 <20 <20 <20 <20 <20 <20 36 36 

Marine SL 500 560 960 540 670 2,100 1,500 5,200 

Symbol (<) = Non-detect (ND) at the value listed (MRL) 

Table C-10. PAHs - High Molecular Weight Analytes, 2010 

Sample I.D.

Benzo(a)- 

anthracene 

Benzo(b) 

fluoranthene 

Benzo(k)

fluoranthene 

Benzo- 

(g,h,i)- 

perylene 

Chrysene Pyrene Benzo(a)-

pyrene 

Dibenz(a,h)- 

anthracene 

Indeno- 

(1,2,3-cd)- 

pyrene 

Fluoranthene

Total 

High 

PAHs 

ug/kg (ppb) 

072810YAQBBC-05 <19 <19 <19 <19 <19 <19 <19 <19 <19 <19 <19 

072810YAQBGC-07 <20 <20 <20 <20 <20 22 <20 <20 <20 27 49 

072810YAQBBC-08 14J 20 20 <20 41 74 <20 <20 <20 110 279 

072810YAQBBC-09 15J 18J 18J <20 42 65 10J <20 <20 82 250 

072810YAQBBC-10 21 30 30 <20 69 82 18J <20 <20 110 360 

Marine SL 1,300 b + k = 3200 670 1,400 2,600 1,600 230 600 1,700 12,000

Symbol (<) = Non-detect (ND) at the value listed (MRL). 

J= The estimated concentration is less than the established MRL. 

Total Petroleum Hydrocarbons (NWTPH Method). Five sediment samples were submitted for 

hydrocarbon identification. Data is presented in Table C-11. No gasoline-, diesel-, or residual-range 

organics were detected in any of the samples. 

Table C-11. Total Petroleum Hydrocarbons, 2010 

Sample I.D.

Gasoline Range 

Organics 

Diesel Range 

Organics

Residual Range 

Organics

mg/kg (ppm) 

072810YAQB-BC-05 <20 <50 <100 

072810YAQB-GC-07 <20 <50 <100 

072810YAQB-BC-08 <20 <50 <100 

072810YAQB-BC-09 <26 <66 <130 

072810YAQB-BC-10 <28 <69 <140 

Symbol (<) = Non-detect (ND) at the value listed (MRL). 

Butyltins (TBT) (Krone 1998 SIM Method). One sediment sample collected from the South Beach 

marina was submitted for TBT analysis and was found to be non-detect for butyltin ions. Data is 

presented in Table C-12. 
Appendix C, Yaquina River ODMDS Evaluation/EA C-9

Table C-12. Butyltins, 2010 

Sample I.D. Tributyltin Dibutyltin Monobutyltin 

ug/kg (ppb) 

072810YAQB-BC-09 <3.6 <5.4 <3.8 

Symbol (<) = Non-detect (ND) at the value listed (MRL). 

In conclusion, the sediment represented by samples collected during the 2010 sampling event meets 

the guidelines established in the SEF (2009) for unconfined in-water placement without further 

characterization. 

YAQUINA BAY OCEAN DISPOSAL SITES

Disposal Volumes 

The USACE historically used the general area offshore of Yaquina Bay for dredged material disposal. 

The volume of dredged material placed at Yaquina Bay ocean disposal sites since 1928 is summarized 

in Table C-13. In 1977, an Interim ODMDS offshore of Yaquina (see Figure C-1) received EPA 

designation and was used by the USACE for dredged material disposal after 1977 and prior to 1986. 

However, because of increased mounding in the Interim Site and its potential adverse effect on 

navigation safety, the USACE selected an alternate ODMDS under the authority of Section 103 of the 

MPRSA. This nearshore Section 103 Site (see Figure C-1) was used for disposal from 1986 to 2000. 

Dredged material continued to accumulate in the nearshore Section 103 Site. In 2001, an evaluation 

was conducted by the USACE and EPA to examine conditions at Yaquina and new locations for ocean 

disposal further offshore from the entrance (USACE and EPA 2001). The recommended areas from 

that study were the North and South ocean disposal sites. These disposal sites were used under 

authorization of Section 103 of the MPRSA. From October 2000 through 2011, only the North 

ODMDS has been used by the USACE for dredged material disposal (see “drop site” in Figure C-1). 

The South ODMDS was used for disposal during the 2012 dredging season. 

The annual dredging and disposal period for the Yaquina project typically occurs in April through 

October. The Yaquina project has two main shoaling areas. The sediment dredged from the entrance 

channel and associated bar crossing accounts for 95% of the annual dredging volume. The interior 30-

foot channel (and turning basin) accounts for 5% of the total annual dredging. In its present 

configuration, the entrance channel up to the turning basin requires annual dredging of up to 370,000 

cubic yards (cy) of shoaled sediment (fine-medium sand with some silt) to maintain the authorized 

depth. Up to an additional 25,000 cy of material may be removed from the South Beach Marina 

access channel, and up to 100,000 cy of material may be removed from Depot Slough every 5-8 years. 

Dredged material is expected to be disposed over a period of 32 days during the dredging period, 

which is April through October. Generally, disposal is expected to occur up to 6 days in April or May, 

then from June 15 to October 31. 

 
Appendix C, Yaquina River ODMDS Evaluation/EA C-10

Table C-13. Volume of Dredged Material Placed at Yaquina Bay Ocean Disposal Sites 

ODMDS Location Year Year Total 

(cy) 

Average 

at Site (cy) 

Total Placed 

at Site (cy) 

Interim Site 

1928-1940* 1,040,000 

252,379 14,638,036 

1941-1967* 5,400,000 

1968-1981* 6,440,000 

1982 331,180 

1983 453,319 

1984 670,773 

1985 302,764 

Nearshore 

Section 103 Site 

1986 242,468 

310,240 4,653,596 

1987 537,843 

1988 324,519 

1989 333,807 

1990 216,696 

1991 316,956 

1992 321,652 

1993 358,407 

1994 206,971 

1995 393,641 

1996 314,636 

1997 370,000 

1998 351,000 

1999 260,000 

2000 105,000 

North ODMDS 

2001 198,284 

217,379 2,173,790 

2002 179,427 

2003 320,455 

2004 241,293 

2005 282,596 

2006 223,150 

2007 192,352 

2008 175,031 

2009 161,678 

2010 199,524 

Total 21,465,422 

*Volumes are approximate

 
Appendix C, Yaquina River ODMDS Evaluation/EA C-11

Sediment Baseline Analysis 

The following baseline information for the Yaquina ocean disposal sites was taken from the 2001 

Yaquina Bay Ocean Dredged Material Disposal Site Evaluation Study and Environmental Assessment

(USACE and EPA 2001). This information as it pertains to sediment quality is considered baseline 

information because it was collected prior to use of the North ODMDS. The information is also 

relevant to the South ODMDS, however, information collected between 2001 and 2010 from the South 

site is considered baseline information given that the site had never been used during this time period. 

Subsequent to the 2000 sampling at the North and South sites, EPA conducted sediment sampling at 

both sites in 2008. The results from the latter sampling are discussed as well. 

2000 Baseline Sediment Analysis

The physical data analysis at the Yaquina ocean disposal sites conducted in 2001 showed that the sites 

had fine to medium marine sand with very little silts and clays (0 to 6%). The physical properties of 

sediments at the ocean disposal sites are similar to the majority of the dredged materials that will be 

placed there. The physical analyses from associated dredging locations in the federal navigation 

channel are similar to the physical analyses at the North site prior in baseline sampling in 2001 and 

more recent sampling at the South ocean disposal site for percent of sand, fines and TOC. 

For all the chemistry analyses that were conducted in 2000, which included all chemicals of concern 

tested in 2010 (see Tables C-1 through C-12), all results were below screening levels. Total metal 

analyses were performed on samples collected in 2000 from the proposed Yaquina North and South 

ODMDS. Low concentrations were detected for most of the metals and these concentrations were far 

below the established screening levels. Analyses for phenols, pesticides and insecticides, low and 

high PAHs, chlorinated hydrocarbons, and miscellaneous extractables were performed on samples 

collected in 2000 from the proposed North and South ocean disposal sites. None of these compounds 

were detected. Analyses for phthalate compounds were performed on samples collected in 2000 the 

proposed Yaquina North and South ocean disposal sites. Dis(2-ethylhexyl) phthalate and diethyl 

phthalate were detected. Concentrations of dis(2-ethylhexyl) phthalate varied from 3.8 to 6.3 ppb, 

which was just above the detection limit of 4.3 ppb, but far below the established screening level of 

8,300 ppb. A concentration of 3.8 ppb of diethyl phthalate was detected in one sample, which was just 

above the detection limit of 3.1 ppb, but far below the established screening level of 1,200 ppb. Given 

these results conducted in 2000 for baseline sampling of the North and South sites prior to disposal at 

these sites, neither of the sites had any elevated levels of chemicals that rise to a level of concern. 

2008 Sediment Analysis

In June 2008, EPA collected sediment samples for physical and chemical analysis using a 0.1 m2

Young modified Van Veen grab sampler at the North and South sites (USACE and EPA 2011). The 

18 sample locations were selected based on 1999-2001 sampling efforts (Figure C-3) so that direct 

comparisons over time could be done. The 2008 survey area size was approximately 2.5 square 

nautical miles and the surveys occurred in water depths of 110 to 150 feet. Samples were analyzed for 

the following: grain size, total solids, TOC, metals, TBT, semivolatile organic compounds (SVOCs), 

PCBs, and PAHs. Between October 2000 and 2009, only the North ODMDS “drop zone” (see Figure 

C-1) has been used for disposal. In 2010 the entire site was used and in 2011 only the south half of the 

North Site was utilized for dredged material disposal. The South ODMDS was used for disposal 

during the 2012 dredging season. Some of the following data tables are divided to show results from 

the area where disposal of dredged material has occurred (“North ODMDS drop site”) and from all 

areas where no disposal has occurred (“background stations”). 
Appendix C, Yaquina River ODMDS Evaluation/EA C-12

Physical Analysis and TOC. For the North ODMDS drop site, the results of physical analysis (Table 

C-14) showed that the sediment collected was primarily medium sand with little variation, ranging 

from 97.8% to 99.7% sand-sized grains (“percent sand”),versus 96.6% to 99.5% sand at the 

background stations. There was higher percent coarse sand at the deepest location (YQ-22) and higher 

percent very fine sand at the shallowest location (YQ-01). The mean percent sand was essentially the 

same at the North drop site stations (98.6%) as that of the background stations (98.3%). The mean and 

median grain sizes were calculated using percentage of grain size. The mean grain sizes at the North 

drop site stations were more consistent than those at the background stations, ranging from 0.195 

millimeters (mm) to 0.213 mm at the former and from 0.171 mm to 0.308 mm at the latter (Figure 

C-4). The largest grain size (0.308 mm) was collected at the deepest location (YQ-22). 

Total solids were only slightly lower in the North drop site (mean 79.5%) than the background stations 

(mean of 81.1%). The TOC (Table C-14) was substantially lower at the North drop site versus the 

background [mean 349.2 milligrams per kilogram (mg/kg) versus 513.3 mg/kg], probably due to the 

relatively low TOC normally found in Oregon coast river sediments as opposed to the higher organic 

carbon normally found in deeper, more productive ocean waters. Baseline TOC samples collected at 

the proposed ocean disposal sites in 2000 averaged 500 mg/kg (USACE and EPA 2001). 

Metals. Overall, metals concentrations were comparable between samples at the North ODMDS drop 

site stations versus those in the background stations (Table C-15). Exceptions included concentrations 

that were slightly lower at the North drop site stations for iron, magnesium, vanadium, and nickel, and 

higher for calcium and potassium. Metals concentrations detected in all samples were far below the 

SEF SLs (SEF 2009). The following metals were not detected at any of the sampling stations: 

antimony, cadmium, cobalt, copper, mercury, selenium, and thallium. 

Organotins (including TBT). In marine sediments, pore-water analysis has been shown to improve the 

reliability of toxicity predictions over bulk-sediment, dry-weight analysis and consequently is required 

in marine environments (Michelsen et al. 1996). No organotin compounds were detected at any 

station (Table C-16); however, the laboratory method reporting limit was much greater than the SEF 

SL. For this analysis, none of the initial calibration and calibration verification, matrix spike/matrix 

spike duplicate, and laboratory duplicates met established laboratory/quality assurance criteria. While 

not noted in the laboratory results, it may also have occurred because of the small amount of pore 

water that can be extracted from sediment consisting primarily of sand. Significant concentrations of 

TBT or other organotins were not expected since dredged material is tested prior to disposal; prior 

testing of the dredge material in 2005 and 2010 showed non-detects of TBT and either non-detects or 

extremely low concentrations for other organotins. 

 
Appendix C, Yaquina River ODMDS Evaluation/EA C-13

Figure C-3. Sediment Sampling Sites, June and August 2008 

 
Appendix C, Yaquina River ODMDS Evaluation/EA C-14

Figure C-4. Mean Grain Size, June 2008 

 
Appendix C, Yaquina River ODMDS Evaluation/EA C-15

Organic Compounds

Semivolatile Organic Compounds (SVOCs). Results of the analysis for SVOCs, including chlorinated 

hydrocarbons, miscellaneous extractables, phthalates, and phenols, are shown in Table C-17 along 

with SEF SLs (SEF 2009). All concentrations of SVOCs in the North drop zone and background 

stations were below SEF SLs. Benzoic acid was detected at three background stations at levels, but 

concentrations were well below SEF SLs. The only SVOCs detected above the method reporting level 

in the North drop zone were bis(2-ethylhexyl) phthalate and di-n-butylphthalate, both of which were 

found only in the sample duplicate collected at station YQ-024. The detected concentrations [73 and 

170 micrograms per kilogram (μg/kg), respectively] were far below the SEF SLs of 1,300 μg/kg and 

1,400 μg/kg. The compounds 2,4-dimethylphenol at station YQ-28 and pentachlorophenol at stations 

YQ-24D and YQ-25 also were identified, but each value is considered an estimate. These results 

above are expected because in a matrix made up of primarily sand-sized particles or larger, any 

organic contamination is expected to be minimal. 

For several compounds, the laboratory method reporting limit exceeded the SEF SLs slightly; these 

included 2,4-dimethylphenol, dieldrin, heptachlor, hexachlorobenzene, hexachlorobutadiene, and nnitrosodiphenylamine. However, the method reporting level was consistent for all compounds 

analyzed by the SVOC method. The reporting levels that were exceeded were for compounds with 

SLs very close to the reporting levels. Numerous other SVOCs had much higher screening levels and 

showed no detections. In addition to the statements above suggesting that concentrations of these 

compounds are not likely of concern, one of the compounds for which the SL was above the method 

reporting limit, were detected in either the 2005 or 2010 sediment characterization sampling of the 

dredge material thus, would not be expected at the ODMDS sites. 

Polychlorinated Biphenyls. PCB aroclors were not detected at any of the Yaquina ODMDS sampling 

stations (Table C-18). The SEF SL is 130 μg/kg for the total of all detected PCBs. 

Pesticides. Pesticides were not detected at any of the Yaquina ODMDS sampling sites (Table C-19). 
Appendix C, Yaquina River ODMDS Evaluation/EA 

Table C-14. Results for Grain Size, Total Solids, and TOC, 2008 

* Sample from southern part of North ODMDS; disposal has not occurred. ** Sample from South ODMDS; disposal had not occurred. D: Duplicate sample. LD: Lab Duplicate. 

Station Water Depth (feet) % Gravel % Coarse Sand (a) % Medium Sand (b) % Fine Sand (c) % Total Sand (a+b+c) % Total Fines Mean Grain Size (mm) TOC (mg/kg-dr

North ODMDS Drop Site YQ-028 122 0.1 1.3 25 71 98 1.8 0.213 286 YQ-023 145 0.3 1.4 21 76 98 1.4 0.205 522 YQ-024 130 0 0.9 21 77 99 1.1 0.204 350 YQ-024D 133 0 0.6 21 78 100 0.2 0.204 276 YQ-025 121 0 0.7 18 80 99 1.3 0.195 312 Background Stations – Southern part of North ODMDS YQ-02* 137 0 0.4 22 76 98 1.8 0.203 495 YQ-02D* 140 0 0.3 20 79 99 1.2 -- 617 YQ-01* 116 0 0.5 8 90 99 1.2 0.171 633 Background Stations – South ODMDS YQ-013** 120 0 0.2 11 86 97 3.5 0.178 577 YQ-014** 133 0 0.2 10 89 99 1.1 0.181 590 YQ-029** 137 0 0.2 9 90 98 1.6 0.180 551 YQ-016** 117 0 0.4 25 72 97 2.9 0.206 388 YQ-016 LD1 -- 0.1 0.4 25 72 97 2.6 -- -- YQ-016 LD2 -- 0.1 0.4 26 72 98 2.0 -- -- YQ-017** 128 0 0.3 17 80 98 2.2 0.191 468 YQ-018** 139 0 0.2 12 85 97 2.8 0.182 456 Background Stations – Outside of ODMDSs YQ-026 140 0 0.2 19 79 98 1.9 0.193 503 YQ-022 154 0 8.2 68 23 99 1.4 0.308 406 YQ-06 134 0.3 0.5 10 89 100 0 0.182 689 YQ-010 116 0 0.4 20 79 99 0.6 0.200 373 YQ-020 149 0 0.2 11 87 99 1.1 0.183 618 YQ-027 130 0 0.7 34 64 98 1.7 0.223 336 
Appendix C, Yaquina River ODMDS Evaluation/EA 

Table C-15. Results for Metals, 2008 (ppm) 

* Sample from southern part of North ODMDS; disposal has not occurred in this area. ** Sample from South ODMDS; disposal had not occurred in this area. D: Duplicate sample. U: The analyte was not detected at or above the reported value. J: The identification of the analyte is acceptable; however, the reported value is an estimate. UJ: The analyte was not detected at or above the reported value; the reported value is an estimate. 

Station Aluminum Antimony Arsenic Barium Beryllium Cadmium Calcium Chromium Cobalt C

North ODMDS Drop Site YQ-028 2170 0.98 UJ 3.46 4.9 0.087 0.49 U 5000 J 6.35 2.5 U YQ-023 2790 0.96 UJ 3.5 4.77 0.11 0.48 U 3500 J 7.43 2.4 U YQ-024 2530 1 UJ 3.65 4.4 0.1 0.5 U 3600 J 7.41 2.5 U YQ-024D 2230 0.96 UJ 3.4 4.6 0.085 0.48 U 3100 J 6.67 2.4 U YQ-025 2460 0.94 UJ 3.49 4.27 0.091 0.47 U 2800 J 7.78 2.4 U Background Stations – Southern Part of North ODMDS YQ-02* 2710 1 UJ 2.59 4.31 0.09 0.5 U 760 J 12.3 2.5 U YQ-02D* 2650 1 UJ 2.56 4.65 0.093 0.5 U 750 J 11.8 2.5 U YQ-01* 2880 0.96 UJ 2.3 5.46 0.1 0.48 U 1190 14.8 2.4 U Background Stations – South ODMDS YQ-013** 2990 1 UJ 2.95 4.37 0.1 0.5 U 1100 J 12.9 2.5 U YQ-014** 3220 1 UJ 3.46 5.06 0.12 0.5 U 760 J 13 2.5 U YQ-029** 2850 1 UJ 3.35 5.17 0.11 0.5 U 790 J 12.1 2.5 U YQ-016** 2200 1 UJ 2.57 3.29 0.084 0.5 U 630 J 9.43 2.5 U YQ-017** 2850 1 UJ 3.26 4.97 0.11 0.5 U 1100 J 11.1 2.5 U YQ-018** 2810 1 UJ 3.02 4.34 0.1 0.5 U 620 J 10.9 2.5 U Background Stations – Outside ODMDS YQ-026 2500 1 UJ 2.78 4.04 0.097 0.5 U 850 J 11.5 2.5 U YQ-022 2210 0.98 UJ 3.68 4 0.095 0.49 U 390 J 8.75 2.5 U YQ-06 2960 1 UJ 3.05 5.54 0.11 0.5 U 780 J 14.1 2.5 U YQ-010 2130 1 UJ 3.17 3.45 0.082 0.5 U 760 J 7.89 2.5 U YQ-020 3040 1 UJ 3.25 5.24 0.1 0.5 U 700 J 14.3 2.5 U YQ-027 2330 1 UJ 2.81 5.35 0.095 0.5 U 540 J 9.49 2.5 U 

SEF SL -- 150 57 -- -- 5.1 -- 260 -- 
Appendix C, Yaquina River ODMDS Evaluation/EA 

Table C-15 (continued). Results for Metals, 2008 (ppm) 

* Sample from southern part of North ODMDS; disposal has not occurred in this area. ** Sample from South ODMDS; disposal had not occurred in this area. D: Duplicate sample. U: The analyte was not detected at or above the reported value. J: The identification of the analyte is acceptable; however, the reported value is an estimate. UJ: The analyte was not detected at or above the reported value; the reported value is an estimate. 

Station Mag- nesium Manganese Mercury Molybdenum Nickel Potassium Selenium Silver Sodium Tha

North ODMDS Drop SiteYQ-028 1380 27.1 0.0099 U 2.5 U 3.4 491 0.49 U 0.049 U 2620 0YQ-023 1730 43.6 0.0098 U 2.4 U 4.7 556 0.48 U 0.048 U 3250 0YQ-024 1670 36.5 0.0096 U 2.5 U 4.3 552 0.5 U 0.05 U 3310 0YQ-024D 1450 31.9 0.0099 U 2.4 U 3.8 502 0.48 U 0.048 U 3090 0YQ-025 1620 32.7 0.01 U 2.4 U 4.76 524 0.47 U 0.047 U 2750 0Background Stations – Southern Part of North ODMDSYQ-02* 1970 40.6 0.0099 U 2.5 U 6.38 637 0.5 U 0.05 U 2600 0YQ-02D* 1950 41.4 0.0098 U 2.5 U 6.34 631 0.5 U 0.05 U 2890 0YQ-01* 2280 54.4 0.0099 U 2.4 U 8.81 639 0.48 U 0.048 U 2700 J 0Background Stations – South ODMDS YQ-013** 2150 46.1 0.0099 U 2.5 U 7.23 631 0.5 U 0.05 U 2880 0YQ-014** 2300 44.3 0.0099 U 2.5 U 7.97 724 0.5 U 0.05 U 3170 0YQ-029** 2230 38.5 0.0097 U 2.5 U 7.13 722 0.5 U 0.05 U 4450 0YQ-016** 1630 31.3 0.0099 U 2.5 U 5.04 517 0.5 U 0.05 U 3140 0YQ-017** 2070 37.5 0.0098 U 2.5 U 6.62 656 0.5 U 0.05 U 2970 0YQ-018** 2030 37 0.0099 U 2.5 U 6.78 643 0.5 U 0.05 U 3070 0Background Stations – Outside of ODMDS YQ-026 1910 38.9 0.0097 U 2.5 U 6.14 598 0.5 U 0.05 U 2890 0YQ-022 1500 28.7 0.01 U 2.5 U 4.1 559 0.49 U 0.049 U 2750 0YQ-06 2230 42.5 0.0098 U 2.5 U 7.56 708 0.5 U 0.05 U 3070 0YQ-010 1510 29.3 0.0099 U 2.5 U 4.7 461 0.5 U 0.05 U 2730 0YQ-020 2280 42.3 0.0099 U 2.5 U 7.88 692 0.5 U 0.05 U 2880 0YQ-027 1600 29.2 0.01 U 2.5 U 5.09 548 0.5 U 0.05 U 2440 0

SEF SL -- -- 0.41 -- -- -- -- 6.1 -- 
Appendix C, Yaquina River ODMDS Evaluation/EA 

Table C-16. Results for Organotin, 2008 (μg/L) 

* Sample from southern part of North ODMDS; disposal has not occurred. ** Sample from South ODMDS; disposal had not occurred. D: Duplicate sample. U: The analyte was not detected at or above the reported value. J: The identification of the analyte is acceptable; however, the reported value is an estimate. UJ: The analyte was not detected at or above the reported value; the reported value is an estimate. R: The presence or absence of the analyte cannot be determined from the data due to severe quality control problems. 

 The data are rejected and considered unusable. No value is reported with this qualification. 

Station Butyltin trichloride Dibutyltin dichloride Tetra- butyltin Tributyltin chloride 

North ODMDS Drop SiteYQ-028 5 U 5 U 5 U 5 U YQ-023 5 U 5 U 5 U 5 U YQ-024 5.1 U 5.1 U 5.1 U 5.1 U YQ-024D 5.1 UJ 5.1 UJ 5.1 U 5.1 U YQ-025 5 U 5 U 5 U 5 U Background Stations – Southern Part of North ODMDSYQ-02* 5.1 U 5.1 U 5.1 U 5.1 U YQ-02D* 5.1 U 5.1 U 5.1 U 5.1 U YQ-01* 5.2 U 5.2 U 5.2 U 5.2 U Background Stations – South ODMDS YQ-013** 5.1 U 5.1 U 5.1 U 5.1 U YQ-014** 5 U 5 U 5 U 5 U YQ-029** 5.1 U 5.1 U 5.1 U 5.1 U YQ-016** 5 U 5 U 5 U 5 U YQ-017** 5.1 U 5.1 U 5.1 U 5.1 U YQ-018** 5.1 U 5.1 U 5.1 U 5.1 U Background Stations – Outside of ODMDS YQ-026 5.1 U 5.1 U 5.1 U 5.1 U YQ-022 5.1 U 5.1 U 5.1 U 5.1 U YQ-06 5.1 U 5.1 U 5.1 U 5.1 U YQ-010 5 U 5 U 5 U 5 U YQ-020 5.1 U R 5.1 U 5.1 U YQ-027 5 U 5 U 5 U 5 U 

SEF SL -- -- -- 0.15 
Appendix C, Yaquina River ODMDS Evaluation/EA 

Table C-17. Results for SVOCs, 2008 (μg/kg) 

* Sample from southern part of North ODMDS; disposal has not occurred. ** Sample from South ODMDS; disposal had not occurred. D: Duplicate sample. U: The analyte was not detected at or above the reported value. J: The identification of the analyte is acceptable; however, the reported value is an estimate. UJ: The analyte was not detected at or above the reported value; the reported value is an estimate. NA: Not analyzed. 

Station 

1,2,4- trichlorobenzene 

2,4- dimethyl phenol 

4- methylphenol 9H- fluorene Acena- phthene Acena- phthylene Anthra- cene Benzene, 1,2- dichloro- Benzene, 1,3- dichloro- Benzene, 1,4- dichloro- Benzen

methan

North ODMDS Drop SiteYQ-028 25 U 25 UJ 25 U 25 U 25 U 25 U 25 U 25 U 25 U 25 U NYQ-023 25 U 25 U 25 U 25 U 25 U 25 U 25 U 25 U 25 U 25 U NYQ-024 30 U 30 U 30 U 30 U 30 U 30 U 30 U 30 U 30 U 30 U NYQ-024D 31 U 31 U 31 U 31 U 31 U 31 U 31 U 31 U 31 U 31 U NYQ-025 31 U 31 U 31 U 31 U 31 U 31 U 31 U 31 U 31 U 31 U NBackground Stations – Southern Part of North ODMDSYQ-02* 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 UJ 29 UJ 29 UJ NYQ-02D* 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U NYQ-01* 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U NBackground Stations - South ODMDS YQ-013** 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U NYQ-014** 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U NYQ-029** 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U NYQ-016** 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U NYQ-017** 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U NYQ-018** 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U NBackground Stations – Outside of ODMDS YQ-026 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U NYQ-022 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U NYQ-06 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U NYQ-010 27 U 27 U 27 U 27 U 27 U 27 U 27 U 27 U 27 U 27 U NYQ-020 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U NYQ-027 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U N

SEF SL 31 29 670 540 500 560 960 35 -- 110 
Appendix C, Yaquina River ODMDS Evaluation/EA 

Table C-17 (continued). Results of SVOCs, 2008 (μg/kg) 

* Sample from southern part of North ODMDS; disposal has not occurred. ** Sample from South ODMDS; disposal had not occurred. D: Duplicate sample. U: The analyte was not detected at or above the reported value. J: The identification of the analyte is acceptable; however, the reported value is an estimate. UJ: The analyte was not detected at or above the reported value; the reported value is an estimate. 

Station 

Benzo- (g,h,i)- perylene 

Benzo[b]- fluoranthene 

Benzo[k]- fluoranthene Benzoic acid Bis- (2-ethylhexyl)- phthalate Butyl- benzyl- phthalate Chry- sene Dibenzo- [a,h]- anthracene Dibenzo- furan Diethyl- phthalate Dim

pht

North ODMDS Drop ZoneYQ-028 25 U 25 U 25 U 140 UJ 25 U 25 U 25 U 50 U 25 U 25 U YQ-023 25 U 25 U 25 U 130 UJ 25 U 25 U 25 U 50 U 25 U 25 U YQ-024 30 U 30 U 30 U 162 U 30 U 30 U 30 U 30 U 30 U 30 U YQ-024D 31 U 31 U 31 U 300 UJ 73 31 U 31 U 62 U 31 U 31 U YQ-025 31 U 31 U 31 U 290 UJ 31 U 31 U 31 U 62 U 31 U 31 U Background Stations – Southern Part of North ODMDSYQ-02* 29 U 29 U 29 U 159 U 29 U 29 U 29 U 29 U 29 U 29 U YQ-02D* 29 U 29 U 29 U 147 U 29 U 29 U 29 U 29 U 29 U 29 U YQ-01* 28 U 28 U 28 U 155 28 U 28 U 28 U 28 U 28 U 28 U Background Stations – South ODMDS YQ-013** 28 U 28 U 28 U 152 UJ 28 U 28 U 28 U 28 U 28 U 28 U YQ-014** 28 U 28 U 28 U 162 28 U 28 U 28 U 28 U 28 U 28 U YQ-029** 29 U 29 U 29 U 150 U 29 U 29 U 29 U 29 U 29 U 29 U YQ-016** 28 U 28 U 28 U 149 U 28 U 28 U 28 U 28 U 28 U 35 UJ YQ-017** 29 U 29 U 29 U 193 UJ 29 U 29 U 29 U 29 U 29 U 29 U YQ-018** 28 U 28 U 28 U 183 U 28 U 28 U 28 U 28 U 28 U 28 U Background Stations – Outside of ODMDS YQ-026 29 U 29 U 29 U 155 U 29 U 29 U 29 U 29 U 29 U 29 U YQ-022 29 U 29 U 29 U 162 U 29 U 29 U 29 U 29 U 29 U 29 U YQ-06 29 U 29 U 29 U 158 29 U 29 U 29 U 29 U 29 U 29 U YQ-010 27 U 27 U 27 U 146 U 27 U 27 U 27 U 27 U 27 U 41 UJ YQ-020 29 U 29 U 29 U 197 UJ 29 U 29 U 29 U 29 U 29 U 29 U YQ-027 28 U 28 U 28 U 195 UJ 28 U 28 U 28 U 28 U 28 U 142 U 

SEF SL 670 3200 650 1300 63 1400 230 540 200 
Appendix C, Yaquina River ODMDS Evaluation/EA 

Table C-17 (continued). Results of SVOCs, 2008 (μg/kg) 

* Sample from southern part of North ODMDS; disposal has not occurred. ** Sample from South ODMDS; disposal had not occurred. D: Duplicate sample. U: The analyte was not detected at or above the reported value. J: The identification of the analyte is acceptable; however, the reported value is an estimate. UJ: The analyte was not detected at or above the reported value; the reported value is an estimate. 

Station Fluor- anthene Hexachloro- benzene Hexa- chloro- butadiene Hexa- chloro- ethane Indeno (1,2,3-cd)- pyrene Naph- thalene Naphthalene, 2-methyl- n-nitroso- diphenyl- amine Penta- chloro- phenol Phen- anthrene PhenoNorth ODMDS Drop ZoneYQ-028 25 U 25 U 25 U 25 U 25 U 25 U 25 U 25 U 50 U 25 U 25 YQ-023 25 U 25 U 25 U 25 U 50 U 25 U 25 U 25 U 50 U 25 U 25 YQ-024 30 U 30 U 30 U 30 U 30 U 30 U 30 U 30 U 30 U 30 U 30 YQ-024D 31 U 31 U 31 U 31 U 62 U 31 U 31 U 31 U 120 UJ 31 U 31 YQ-025 31 U 31 U 31 U 31 U 62 U 31 U 31 U 31 U 124 UJ 31 U 31 Background Stations – Southern part of North ODMDSYQ-02* 29 U 29 U 29 U 29 UJ 29 U 29 U 29 U 29 U 29 U 29 U 29 YQ-02D* 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 YQ-01* 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 Background Stations – South ODMDS YQ-013** 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 YQ-014** 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 YQ-029** 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 YQ-016** 28 U 28 U 28 U 28 UJ 28 U 28 U 28 U 28 U 28 U 28 U 28 YQ-017** 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 YQ-018** 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 Background Stations – Outside of ODMDS YQ-026 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 YQ-022 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 YQ-06 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 YQ-010 27 U 27 U 27 U 27 U 27 U 27 U 27 U 27 U 27 U 27 U 27 YQ-020 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 YQ-027 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 

SEF SL 1700 22 11 -- 600 2100 670 28 400 1500 4
Appendix C, Yaquina River ODMDS Evaluation/EA 

Table C-18. Results for PCBs, 2008 (μg/kg) 

* Sample from southern part of North ODMDS; disposal has not occurred. ** Sample from South ODMDS; disposal had not occurred. D: Duplicate sample. U: The analyte was not detected at or above the reported value. 

Station PCB- 1016 PCB- 1221 PCB- 1232 PCB- 1242 PCB- 1248 PCB- 1254 PCB- 1260 

North ODMDS Drop Zone YQ-028 10 U 10 U 20 U 10 U 10 U 10 U 10 U YQ-023 10 U 10 U 20 U 10 U 10 U 10 U 10 U YQ-024 10 U 10 U 20 U 10 U 10 U 10 U 10 U YQ-024D 10 U 10 U 20 U 10 U 10 U 10 U 10 U YQ-025 10 U 10 U 20 U 10 U 10 U 10 U 10 U Background Stations – Southern part of North ODMDS YQ-02* 10 U 10 U 20 U 10 U 10 U 10 U 10 U YQ-02D* 10 U 10 U 20 U 10 U 10 U 10 U 10 U YQ-01* 10 U 10 U 21 U 10 U 10 U 10 U 10 U Background Stations – South ODMDS YQ-013** 10 U 10 U 20 U 10 U 10 U 10 U 10 U YQ-014** 10 U 10 U 20 U 10 U 10 U 10 U 10 U YQ-029** 10 U 10 U 20 U 10 U 10 U 10 U 10 U YQ-016** 10 U 10 U 20 U 10 U 10 U 10 U 10 U YQ-017** 10 U 10 U 20 U 10 U 10 U 10 U 10 U YQ-016** 10 U 10 U 20 U 10 U 10 U 10 U 10 U YQ-017** 10 U 10 U 20 U 10 U 10 U 10 U 10 U YQ-018** 10 U 10 U 20 U 10 U 10 U 10 U 10 U Background Stations – Outside of ODMDS YQ-026 10 U 10 U 20 U 10 U 10 U 10 U 10 U YQ-022 10 U 10 U 20 U 10 U 10 U 10 U 10 U YQ-06 10 U 10 U 20 U 10 U 10 U 10 U 10 U YQ-010 10 U 10 U 20 U 10 U 10 U 10 U 10 U YQ-020 10 U 10 U 20 U 10 U 10 U 10 U 10 U YQ-027 10 U 10 U 20 U 10 U 10 U 10 U 10 U 
Appendix C, Yaquina River ODMDS Evaluation/EA 

Table C-19. Results for Pesticides, 2008 (μg/kg) 

* Sample from southern part of North ODMDS; disposal has not occurred. ** Sample from South ODMDS; disposal had not occurred. D: Duplicate sample. U: The analyte was not detected at or above the reported value. 

Station Aldrin 

cis-Chlordane (alphaChlordane) 

cisNonachlor Gamma- chlor- dane trans- Non- achlor Dieldrin Endrin Hepta- chlor Hepta- chlor Epoxide Lindane o,p'- DDD o,p'- DDE 

North ODMDS Drop Zone YQ-028 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U YQ-023 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U YQ-024 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U YQ-024D 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U YQ-025 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U 2.3 U Background Stations – Southern part of North ODMDS YQ-02* 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U YQ-02D* 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U YQ-01* 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U Background Stations – South ODMDS YQ-013** 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U YQ-014** 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U YQ-029** 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U YQ-016** 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U YQ-017** 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U YQ-018** 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U Background Stations – Outside of ODMDS YQ-026 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U YQ-022 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U YQ-06 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U YQ-010 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U YQ-020 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U YQ-027 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U 

SEF SL 9.5 2.8 1.9 -- 1.5 -- -- -- -- 
Appendix C, Yaquina River ODMDS Evaluation/EA C-25

DISCUSSION AND CONCLUSIONS

When evaluating the appropriateness and suitability of a location(s) to receive dredge material, the 

EPA and the USACE need to consider the following areas with regards to sediment quality: 

1. Physical and chemical sediment compatibility. 

2. Water column chemistry and physical characteristics. 

3. Influence of past disposal. 

4. Size and shape of the disposal site. 

5. Size of the buffer zone. 

6. Degraded areas. 

7. Potential for cumulative effects. 

The latest sediment sampling efforts for the Yaquina federal navigation project and proposed North 

and South ocean disposal sites occurred in 2010 and 2008, respectively. Sampling and analyses of 

sediments were conducted in accordance with the SEF (2009) and included testing for metals, TOC, 

pesticides, PCBs, phenols, phthalates, miscellaneous extractables, PAHs and TBT. 

Eight box core grab samples and one gravity core sample were collected from the federal navigation 

project area on July 28, 2010. All nine sediment samples were submitted for physical analyses, with 

five samples collected from finer-grained areas further subjected to chemical analyses. The overall 

mean grain size for the project is 72% sand, with a mean grain size of 94% sand for the federal 

navigation channel (entrance to turning basin) and 45% sand within South Beach marina. All 

analyte concentrations were substantially below the SEF SLs. The data from samples collected 

during 2010 were consistent with historical sampling results. The material within the federal 

navigation channel and South Beach marina was found to be suitable for unconfined in-water 

placement without further characterization. 

Sediment samples were collected in and near the Yaquina ocean disposal sites in 2008 to compare 

conditions of the North ODMDS drop site where dredged material from the Yaquina Bay and 

federal channel has been placed, with stations where dredged material disposal has not occurred 

(“background” stations). Physical analyses showed primarily medium sand with little variation. 

The percent sand was essentially the same at the North ODMDS drop site stations as that of the 

background stations, although the mean grain sizes were more consistent at the North ODMDS drop 

zone stations. Metals concentrations detected in all samples were far below SEF SLs. The 

following metals were not detected at any of the sampling stations: antimony, cadmium, cobalt, 

copper, mercury, selenium, and thallium. No organotin (TBT), PCBs or pesticides were detected at 

any station. All detected concentrations of SVOCs (including PAHs) in both the North ODMDS 

drop zone and background stations were below SEF SLs. Although the laboratory reporting limits 

for the following compounds exceeded the SEF SLs, none were detected above the reporting limits 

in any samples: 2,4-dimethylphenol, dieldrin, heptachlor, hexachlorobenzene, hexachlorobutadiene, 

and n-nitrosodiphenylamine. The sediments in the North ODMDS drop zone stations do not appear 

to have been negatively impacted by dredged material disposal. 
Appendix C, Yaquina River ODMDS Evaluation/EA C-26

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