# 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 Federa l Navigation Project ..................................................................... C-1 Water Quality ................................................................................................................. ........... C-3

Baseline Sedime nt 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 So uth 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-1 4

LIST OF TABLES

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

Table C-2. Metals and Tota l 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 Molecu lar Weight Analytes, 2010 ........................................................ C-8 Table C-10. PAHs - High Molecu lar Weight Analytes, 2010 ..................................................... C-8

Table C-11. Total Petroleu m 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 fo r Metals, 2008 (ppm) .............................................................................. C-17

Table C-16. Results for Or ganotin, 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

G ENERAL

The Marine Protection, Research and Sanctuaries Ac t (MPRSA) requires that four general criteria and eleven specific factors be addressed during the designation process (40 CF R 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 dis posal sites (ODMDS) along the Oregon Coast usually

consist of medium to fine sands taken from entr ance 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 pr oject 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 isolat ion from known or historical contaminant sources, dredged sands from entrance bar shoals are often deem ed acceptable for ocean disposal without further testing (40 CFR 227.13(b)). The use of Sedime nt Evaluation Framework (SEF) screening levels provides an additional safeguard for this material. Data for channel sands a nd fines for the navigation project and the North and South ocean disposal s ites (Figure C-1) are presented in this appendix.

The general criteria and specific factors of the MPRS A 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 Ev aluation Study/EA report) that is used to evaluate each disposal site on its compliance with the requireme nts 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.



# Y AQUINA 

# B AY AND 

# R IVER 

# F EDERAL 

# N AVIGATION 

# P ROJECT

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 a nd 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-fo ot 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 De pot 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 2 009) guidance manual used by federal and state permitting agencies in Oregon for evaluating the poten tial 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 locatio n. 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. Info rmation 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 lo cations 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, th e U.S. Geological Survey collected samples from 14 stations offshore at Yaquina Ba y 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 susp ended 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 na vigation channel are logging, wood processing, fish processing and urban runoff. From the USACE sediment sampling st udies, the sediment is typically below screening levels (if they were identified at that time) for c ontaminants of concern. Consequently, sediment has been acceptable for in-water ocean disposal.



## 2010 Sediment Quality Re sults and Discussion

The latest sediment sampling effort at Yaquina Bay occurred on July 28, 2010 (USACE September 2010). The evaluation was conducted following pro cedures 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 i ssues associated with dredging and sediment

management.

1 

### All sediment analysis reports condu cted by the USACE for the federal navigation project can be found at http://www.n wp.usace.army.mil/envi ronment/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 gr ain size for the project is 72% sand, with a mean grain size of 94% sand for the federal navigation ch annel (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), Tota l Organic Carbon (EPA method 9060) . Five sediment samples were submitted for metals and total organic carbon (T OC) 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 gammaBHC Alpha Gamma* 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 <0.9 8 <0.98 <0.98 <2.0 <0.98 <0.98
072810YAQB-BC-08 <1.9 <1.9 <1.9 <0.9 7 <0.97 <0.97 <1.9 <0.97 <0.97
072810YAQB-BC-09 <2.0 <2.0 <2.0 <0.9 8 <0.98 <0.98 <2.0 <0.98 <0.98
072810YAQB-BC-10 <2.0 <2.0 <2.0 <0.9 8 <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 chlo rinated hydrocarbons, phenols, phthalates and miscellaneous extractables, with data presented in Ta bles C-5 to C-8. No chlorinated hydrocarbons or

miscellaneous extractables were de tected above MRLs in any of the samples. Bis(2-ethylhexyl) phthalate and phenol were detected in all samp les, 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 Hydr ocarbons (EPA method 8270C) . Five sediment samples were submitted for low and high molecular weight polynuclear aromat ic hydrocarbons (PAHs), with data presented in Tables C-9 and C-10. Phenanthrene, a low molecu lar 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 foun d 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.



# Y AQUINA 

# B AY 

# O CEAN 

# D ISPOSAL 

# S ITES



## 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 o ffshore 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 Figur e C-1) was used for disposal from 1986 to 2000.

Dredged material continued to accumulate in the n earshore Section 103 Site. In 2001, an evaluation was conducted by the USACE and EPA to examine c onditions at Yaquina and new locations for ocean disposal further offshore from the entrance (USA CE and EPA 2001). The recommended areas from that study were the North and South ocean dispo sal 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 mate rial 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 Yaqui na project typically occurs in April through October. The Yaquina project has two main shoa ling 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 turn ing basin requires annual dredging of up to 370,000 cubic yards (cy) of shoaled sediment (fine-medium sa nd with some silt) to maintain the authorized depth. Up to an additional 25,000 cy of mate rial may be removed from the South Beach Marina access channel, and up to 100,000 cy of material ma y 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. Ge nerally, 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 S ite Evaluation Study and Environmental Assessment (USACE and EPA 2001). This information as it pert ains 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, informatio n 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 a nd 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 dis posal 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 th e 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 r esults 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 miscella neous extractables were performed on samples collected in 2000 from the proposed North and South o cean 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 si tes. Dis(2-ethylhexyl) phthalate and diethyl phthalate were detected. Concentr ations 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 pht halate 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 leve ls 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 m 2


### 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 dept hs of 110 to 150 feet. Samples were analyzed for the following: grain size, total solids, TOC, me tals, TBT, semivolatile organic compounds (SVOCs), PCBs, and PAHs. Between Oct ober 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 dis posal. The South ODMDS was used for disposal during the 2012 dredging season. Some of the followi ng data tables are divided to show results from the area where disposal of dredged material h as 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 (“percen t sand”),versus 96.6% to 99.5% sand at the background stations. There was higher percent coar se 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 c onsistent than those at the background stations, ranging from 0.195 millimeters (mm) to 0.213 mm at the former a nd 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 substa ntially lower at the North drop site versus the background [mean 349.2 milligrams per kilogram (m g/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 200 0 averaged 500 mg/kg (USACE and EPA 2001).

Metals . Overall, metals concentrations were comp arable between samples at the North ODMDS drop site stations versus those in the background stati ons (Table C-15). Exceptions included concentrations that were slightly lower at the North drop site st ations for iron, magnesium, vanadium, and nickel, and higher for calcium and potassium. Me tals 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, me rcury, 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 calibrati on and calibration verification, matrix spike/matrix spike duplicate, and laboratory duplicates met estab lished laboratory/quality assu rance 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 dre dged material is tested prior to disposal; prior testing of the dredge material in 2005 and 2010 s howed 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, phthala tes, 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 detect ed 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) phtha late and di-n-butylphthala te, 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 va lue 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 re porting level was consistent for all compounds analyzed by the SVOC method. The reporting leve ls 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 statemen ts 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/EAC-16Table 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.StationWaterDepth (feet)%Gravel% CoarseSand (a)% MediumSand (b)% FineSand (c)% TotalSand(a+b+c)% TotalFinesMeanGrain Size(mm)TOC(mg/kg-dry)North ODMDS Drop SiteYQ-028 122 0.1 1.3 25 71 98 1.8 0.213 286YQ-023 145 0.3 1.4 21 76 98 1.4 0.205 522YQ-024 130 0 0.9 21 77 99 1.1 0.204 350YQ-024D 133 0 0.6 21 78 100 0.2 0.204 276YQ-025 121 0 0.7 18 80 99 1.3 0.195 312Background Stations – Southern part of North ODMDSYQ-02* 137 0 0.4 22 76 98 1.8 0.203 495YQ-02D* 140 0 0.3 20 79 99 1.2--617YQ-01* 116 0 0.5 8 90 99 1.2 0.171 633Background Stations – South ODMDSYQ-013** 120 0 0.2 11 86 97 3.5 0.178 577YQ-014** 133 0 0.2 10 89 99 1.1 0.181 590YQ-029** 137 0 0.2 9 90 98 1.6 0.180 551YQ-016** 117 0 0.4 25 72 97 2.9 0.206 388YQ-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 468YQ-018** 139 0 0.2 12 85 97 2.8 0.182 456Background Stations – Outside of ODMDSsYQ-026 140 0 0.2 19 79 98 1.9 0.193 503YQ-022 154 0 8.2 68 23 99 1.4 0.308 406YQ-06 134 0.3 0.5 10 89 100 0 0.182 689YQ-010 116 0 0.4 20 79 99 0.6 0.200 373YQ-020 149 0 0.2 11 87 99 1.1 0.183 618YQ-027 130 0 0.7 34 64 98 1.7 0.223 336Appendix C, Yaquina River ODMDS Evaluation/EAC-17Table 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; disposalhad not occurred in this area.D: Duplicate sample.U: The analyte was not detectedat 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 thereported value; the reported value is an estimate.StationAluminumAntimonyArsenicBariumBerylliumCadmiumCalciumChromiumCobaltCopperIronLeadNorth ODMDS Drop SiteYQ-028 2170 0.98 UJ 3.46 4.9 0.087 0.49 U 5000 J 6.35 2.5 U 2.5 U 4550 0.99YQ-023 2790 0.96 UJ 3.5 4.77 0.11 0.48 U 3500 J 7.43 2.4 U 2.4 U 5900 1.1YQ-024 2530 1 UJ 3.65 4.4 0.1 0.5 U 3600 J 7.41 2.5 U 2.5 U 5520 1.1YQ-024D 2230 0.96 UJ 3.4 4.6 0.0850.48 U 3100 J 6.67 2.4 U 2.4 U 4690 1YQ-025 2460 0.94 UJ 3.49 4.27 0.091 0.47 U 2800 J 7.78 2.4 U 2.4 U 5190 1.1Background Stations – Southern Part of North ODMDSYQ-02* 2710 1 UJ 2.59 4.31 0.09 0.5 U 760 J 12.3 2.5 U 2.5 U 6200 1.3YQ-02D* 2650 1 UJ 2.56 4.65 0.093 0.5 U 750 J 11.8 2.5 U 2.5 U 6020 1.3YQ-01* 2880 0.96 UJ 2.3 5.46 0.10.48 U 1190 14.8 2.4 U 2.4 U 6730 1.8Background Stations – South ODMDSYQ-013** 2990 1 UJ 2.95 4.37 0.1 0.5 U 1100 J 12.9 2.5 U 2.5 U 6900 1.5YQ-014** 3220 1 UJ 3.46 5.06 0.12 0.5 U 760 J 13 2.5 U 2.5 U 7700 1.5YQ-029** 2850 1 UJ 3.35 5.17 0.11 0.5 U 790 J 12.1 2.5 U 2.5 U 7150 1.5YQ-016** 2200 1 UJ 2.57 3.29 0.084 0.5 U 630 J 9.43 2.5 U 2.5 U 5460 1.1YQ-017** 2850 1 UJ 3.26 4.97 0.11 0.5 U 1100 J 11.1 2.5 U 2.5 U 6940 1.3YQ-018** 2810 1 UJ 3.02 4.34 0.1 0.5 U 620 J 10.9 2.5 U 2.5 U 6640 1.3Background Stations – Outside ODMDSYQ-026 2500 1 UJ 2.78 4.04 0.097 0.5 U 850 J 11.5 2.5 U 2.5 U 6000 1.3YQ-022 2210 0.98 UJ 3.68 4 0.095 0.49 U 390 J 8.75 2.5 U 2.5 U 6180 1.3YQ-06 2960 1 UJ 3.05 5.54 0.11 0.5 U 780 J 14.1 2.5 U 2.5 U 6950 1.4YQ-010 2130 1 UJ 3.17 3.45 0.082 0.5 U 760 J 7.89 2.5 U 2.5 U 4950 1.1YQ-020 3040 1 UJ 3.25 5.24 0.1 0.5 U 700 J 14.3 2.5 U 2.5 U 7440 1.5YQ-027 2330 1 UJ 2.81 5.35 0.095 0.5 U 540 J 9.49 2.5 U 2.5 U 5760 1.1SEF SL -- 150 57 -- -- 5.1 -- 260 -- 390 -- 450Appendix C, Yaquina River ODMDS Evaluation/EAC-18Table 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; disposalhad not occurred in this area.D: Duplicate sample.U: The analyte was not detectedat 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 thereported value; the reported value is an estimate.StationMag-nesiumManganeseMercuryMolybdenumNickelPotassiumSeleniumSilverSodiumThalliumVanadiumZincNorth ODMDS Drop SiteYQ-028 1380 27.1 0.0099 U 2.5 U 3.4 4910.49 U 0.049 U 2620 0.25 U 6.44 8.38YQ-023 1730 43.6 0.0098 U 2.4 U 4.7556 0.48 U 0.048 U 3250 0.24 U 8.65 11YQ-024 1670 36.5 0.0096 U 2.5 U 4.3 5520.5 U 0.05 U 3310 0.25 U 7.84 10.5YQ-024D 1450 31.9 0.0099 U 2.4 U 3.8502 0.48 U 0.048 U 3090 0.24 U 6.89 8.79YQ-025 1620 32.7 0.01 U 2.4 U 4.76 5240.47 U 0.047 U 2750 0.24 U 7.66 9.89Background Stations – Southern Part of North ODMDSYQ-02* 1970 40.6 0.0099 U 2.5 U 6.38 6370.5 U 0.05 U 2600 0.25 U 9.79 11.7YQ-02D* 1950 41.4 0.0098 U 2.5 U 6.34 6310.5 U 0.05 U 2890 0.25 U 9.68 11.6YQ-01* 2280 54.4 0.0099 U 2.4 U 8.81 6390.48 U 0.048 U 2700 J 0.24 U 14.1 13.9Background Stations – South ODMDSYQ-013** 2150 46.1 0.0099 U 2.5 U 7.23631 0.5 U 0.05 U 2880 0.25 U 12 11.9YQ-014** 2300 44.3 0.0099 U 2.5 U 7.97 7240.5 U 0.05 U 3170 0.25 U 11.8 13.8YQ-029** 2230 38.5 0.0097 U 2.5 U 7.13 7220.5 U 0.05 U 4450 0.25 U 10.9 12.9YQ-016** 1630 31.3 0.0099 U 2.5 U 5.04 5170.5 U 0.05 U 3140 0.25 U 8.77 9.66YQ-017** 2070 37.5 0.0098 U 2.5 U 6.62 6560.5 U 0.05 U 2970 0.25 U 10.1 12.3YQ-018** 2030 37 0.0099 U 2.5 U 6.78 6430.5 U 0.05 U 3070 0.25 U 10 11.8Background Stations – Outside of ODMDSYQ-026 1910 38.9 0.0097 U 2.5 U 6.14598 0.5 U 0.05 U 2890 0.25 U 9.54 11YQ-022 1500 28.7 0.01 U 2.5 U 4.1 5590.49 U 0.049 U 2750 0.25 U 9.19 10.4YQ-06 2230 42.5 0.0098 U 2.5 U 7.56 7080.5 U 0.05 U 3070 0.25 U 10.5 13.1YQ-010 1510 29.3 0.0099 U 2.5 U 4.7 4610.5 U 0.05 U 2730 0.25 U 7.28 8.96YQ-020 2280 42.3 0.0099 U 2.5 U 7.88 6920.5 U 0.05 U 2880 0.25 U 11.1 13.1YQ-027 1600 29.2 0.01 U 2.5 U 5.09 5480.5 U 0.05 U 2440 0.25 U 8.83 9.91SEF SL -- -- 0.41 -- -- -- -- 6.1 -- -- -- 410Appendix C, Yaquina River ODMDS Evaluation/EAC-19Table 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 detectedat 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 thereported value; the reported value is an estimate.R: The presence or absence of the analyte cannot be determined from the datadue to severe quality control problems.The data are rejected and considered unusable. No value is reported with this qualification.StationButyltintrichlorideDibutyltindichlorideTetra-butyltinTributyltinchlorideNorth ODMDS Drop SiteYQ-0285 U 5 U 5 U 5 UYQ-0235 U 5 U 5 U 5 UYQ-0245.1 U 5.1 U 5.1 U 5.1 UYQ-024D5.1 UJ 5.1 UJ 5.1 U 5.1 UYQ-0255 U 5 U 5 U 5 UBackground Stations – Southern Part of North ODMDSYQ-02* 5.1 U 5.1 U 5.1 U 5.1 UYQ-02D* 5.1 U 5.1 U 5.1 U 5.1 UYQ-01* 5.2 U 5.2 U 5.2 U 5.2 UBackground Stations – South ODMDSYQ-013** 5.1 U 5.1 U 5.1 U 5.1 UYQ-014** 5 U 5 U 5 U 5 UYQ-029** 5.1 U 5.1 U 5.1 U 5.1 UYQ-016** 5 U 5 U 5 U 5 UYQ-017** 5.1 U 5.1 U 5.1 U 5.1 UYQ-018** 5.1 U 5.1 U 5.1 U 5.1 UBackground Stations – Outside of ODMDSYQ-026 5.1 U 5.1 U 5.1 U 5.1 UYQ-022 5.1 U 5.1 U 5.1 U 5.1 UYQ-06 5.1 U 5.1 U 5.1 U 5.1 UYQ-010 5 U 5 U 5 U 5 UYQ-020 5.1 U R 5.1 U 5.1 UYQ-027 5 U 5 U 5 U 5 USEF SL -- -- -- 0.15Appendix C, Yaquina River ODMDS Evaluation/EAC-20Table 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 detectedat 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 thereported value; the reported value is an estimate.NA: Not analyzed.Station1,2,4-trichlorobenzene2,4-dimethylphenol4-methylphenol9H-fluoreneAcena-phtheneAcena-phthyleneAnthra-ceneBenzene,1,2-dichloro-Benzene,1,3-dichloro-Benzene,1,4-dichloro-Benzene-methanolBenzo(a)-anthra-ceneBenzo(a)-pyreneNorth ODMDS Drop SiteYQ-028 25 U 25 UJ 25 U 25 U 25 U 25 U 25 U 25 U 25 U 25 U NA 25 U 25 UYQ-023 25 U 25 U 25 U 25 U 25 U 25 U 25 U 25 U 25 U 25 UNA25 U 25 UYQ-024 30 U 30 U 30 U 30 U 30 U 30 U 30 U 30 U 30 U 30 UNA30 U 30 UYQ-024D 31 U 31 U 31 U 31 U 31 U 31 U 31 U 31 U 31 U 31 UNA31 U 31 UYQ-025 31 U 31 U 31 U 31 U 31 U 31 U 31 U 31 U 31 U 31 UNA31 U 31 UBackground 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 UJNA29 U 29 UYQ-02D* 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 UNA29 U 29 UYQ-01* 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 UNA28 U 28 UBackground Stations - South ODMDSYQ-013** 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 UNA28 U 28 UYQ-014** 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 UNA28 U 28 UYQ-029** 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 UNA29 U 29 UYQ-016** 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 UNA28 U 28 UYQ-017** 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 UNA29 U 29 UYQ-018** 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 UNA28 U 28 UBackground Stations – Outside of ODMDSYQ-026 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 UNA29 U 29 UYQ-022 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 UNA29 U 29 UYQ-06 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 UNA29 U 29 UYQ-010 27 U 27 U 27 U 27 U 27 U 27 U 27 U 27 U 27 U 27 UNA27 U 27 UYQ-020 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 UNA29 U 29 UYQ-027 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 UNA28 U 28 USEF SL 31 29 670 540 500 560 960 35 -- 110--1300 1600Appendix C, Yaquina River ODMDS Evaluation/EAC-21Table 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 detectedat 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 thereported value; the reported value is an estimate.StationBenzo-(g,h,i)-peryleneBenzo[b]-fluorantheneBenzo[k]-fluorantheneBenzoicacidBis-(2-ethylhexyl)-phthalateButyl-benzyl-phthalateChry-seneDibenzo-[a,h]-anthraceneDibenzo-furanDiethyl-phthalateDimethyl-phthalateDi-n-Butyl-phthalateDi-n-Octyl-phthalateNorth ODMDS Drop ZoneYQ-028 25 U 25 U 25 U 140 UJ 25 U 25 U 25 U 50 U 25 U 25 U 25 U 25 U 50 UYQ-023 25 U 25 U 25 U 130 UJ 25 U 25 U 25 U 50 U 25 U 25 U 25 U 25 U 25 UYQ-024 30 U 30 U 30 U 162 U 30 U 30 U 30 U 30 U 30 U 30 U 30 U 30 U 30 UYQ-024D 31 U 31 U 31 U 300 UJ 73 31 U 31 U 62 U 31 U 31 U 31 U 170 31 UYQ-025 31 U 31 U 31 U 290 UJ 31 U 31 U 31 U 62 U 31 U 31 U 31 U 31 U 31 UBackground 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 29 U 29 U 29 UYQ-02D* 29 U 29 U 29 U 147 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 UYQ-01* 28 U 28 U 28 U 155 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 UBackground Stations – South ODMDSYQ-013** 28 U 28 U 28 U 152 UJ 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 UYQ-014** 28 U 28 U 28 U 162 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 UYQ-029** 29 U 29 U 29 U 150 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 UYQ-016** 28 U 28 U 28 U 149 U 28 U 28 U 28 U 28 U 28 U 35 UJ 28 U 28 U 28 UYQ-017** 29 U 29 U 29 U 193 UJ 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 UYQ-018** 28 U 28 U 28 U 183 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 UBackground Stations – Outside of ODMDSYQ-026 29 U 29 U 29 U 155 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 UYQ-022 29 U 29 U 29 U 162 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 UYQ-06 29 U 29 U 29 U 158 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 UYQ-010 27 U 27 U 27 U 146 U 27 U 27 U 27 U 27 U 27 U 41 UJ 27 U 27 U 27 UYQ-020 29 U 29 U 29 U 197 UJ 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 UYQ-027 28 U 28 U 28 U 195 UJ 28 U 28 U 28 U 28 U 28 U 142 U 28 U 28 U 28 USEF SL 670 3200 650 1300 63 1400 230 540 200 71 1400 6200Appendix C, Yaquina River ODMDS Evaluation/EAC-22Table 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 detectedat 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 thereported value; the reported value is an estimate.StationFluor-antheneHexachloro-benzeneHexa-chloro-butadieneHexa-chloro-ethaneIndeno(1,2,3-cd)-pyreneNaph-thaleneNaphthalene,2-methyl-n-nitroso-diphenyl-aminePenta-chloro-phenolPhen-anthrenePhenolPhenol,2-methyl-PyreneNorth 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 U 25 U 25 UYQ-023 25 U 25 U 25 U 25 U 50 U 25 U 25 U 25 U 50 U 25 U 25 U 25 U 25 UYQ-024 30 U 30 U 30 U 30 U 30 U 30 U 30 U 30 U 30 U 30 U 30 U 30 U 30 UYQ-024D 31 U 31 U 31 U 31 U 62 U 31 U 31 U 31 U 120 UJ 31 U 31 U 31 U 31 UYQ-025 31 U 31 U 31 U 31 U 62 U 31 U 31 U 31 U 124 UJ 31 U 31 U 31 U 31 UBackground 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 U 29 U 29 UYQ-02D* 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 UYQ-01* 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 UBackground Stations – South ODMDSYQ-013** 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 UYQ-014** 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 UYQ-029** 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 UYQ-016** 28 U 28 U 28 U 28 UJ 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 UYQ-017** 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 UYQ-018** 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 UBackground Stations – Outside of ODMDSYQ-026 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 UYQ-022 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 UYQ-06 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 UYQ-010 27 U 27 U 27 U 27 U 27 U 27 U 27 U 27 U 27 U 27 U 27 U 27 U 27 UYQ-020 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 U 29 UYQ-027 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 U 28 USEF SL 1700 22 11 -- 600 2100 670 28 400 1500 420 63 2600Appendix C, Yaquina River ODMDS Evaluation/EAC-23Table 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 detectedat or above the reported value.StationPCB-1016PCB-1221PCB-1232PCB-1242PCB-1248PCB-1254PCB-1260North ODMDS Drop ZoneYQ-028 10 U 10 U 20 U 10 U 10 U 10 U 10 UYQ-023 10 U 10 U 20 U 10 U 10 U 10 U 10 UYQ-024 10 U 10 U 20 U 10 U 10 U 10 U 10 UYQ-024D 10 U 10 U 20 U 10 U 10 U 10 U 10 UYQ-025 10 U 10 U 20 U 10 U 10 U 10 U 10 UBackground Stations – Southern part of North ODMDSYQ-02* 10 U 10 U 20 U 10 U 10 U 10 U 10 UYQ-02D* 10 U 10 U 20 U 10 U 10 U 10 U 10 UYQ-01* 10 U 10 U 21 U 10 U 10 U 10 U 10 UBackground Stations – South ODMDSYQ-013** 10 U 10 U 20 U 10 U 10 U 10 U 10 UYQ-014** 10 U 10 U 20 U 10 U 10 U 10 U 10 UYQ-029** 10 U 10 U 20 U 10 U 10 U 10 U 10 UYQ-016** 10 U 10 U 20 U 10 U 10 U 10 U 10 UYQ-017** 10 U 10 U 20 U 10 U 10 U 10 U 10 UYQ-016** 10 U 10 U 20 U 10 U 10 U 10 U 10 UYQ-017** 10 U 10 U 20 U 10 U 10 U 10 U 10 UYQ-018** 10 U 10 U 20 U 10 U 10 U 10 U 10 UBackground Stations – Outside of ODMDSYQ-026 10 U 10 U 20 U 10 U 10 U 10 U 10 UYQ-022 10 U 10 U 20 U 10 U 10 U 10 U 10 UYQ-06 10 U 10 U 20 U 10 U 10 U 10 U 10 UYQ-010 10 U 10 U 20 U 10 U 10 U 10 U 10 UYQ-020 10 U 10 U 20 U 10 U 10 U 10 U 10 UYQ-027 10 U 10 U 20 U 10 U 10 U 10 U 10 UAppendix C, Yaquina River ODMDS Evaluation/EAC-24Table 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 detectedat or above the reported value.StationAldrincis-Chlordane(alphaChlordane)cisNonachlorGamma-chlor-danetrans-Non-achlorDieldrinEndrinHepta-chlorHepta-chlorEpoxideLindaneo,p'-DDDo,p'-DDEo,p'-DDTP,P'-DDDP,P'-DDEP,P'-DDTNorth ODMDS Drop ZoneYQ-028 2.3 U 2.3 U 2.3 U 2.3 U 2.3U 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 UYQ-023 2.3 U 2.3 U 2.3 U 2.3 U 2.3U 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 UYQ-024 2.3 U 2.3 U 2.3 U 2.3 U 2.3U 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 UYQ-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 2.2 U 2.2 U 2.2 U 2.2 UYQ-025 2.3 U 2.3 U 2.3 U 2.3 U 2.3U 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 UBackground Stations – Southern part of North ODMDSYQ-02* 2.2 U 2.2 U 2.2 U 2.2 U 2.2U 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 UYQ-02D* 2.1 U 2.1 U 2.1 U 2.1 U 2.1U 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 UYQ-01* 2.2 U 2.2 U 2.2 U 2.2 U 2.2U 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 UBackground Stations – South ODMDSYQ-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 2 U 2 U 2 U 2 UYQ-014** 2.1 U 2.1 U 2.1 U 2.1 U 2.1U 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 UYQ-029** 2.2 U 2.2 U 2.2 U 2.2 U 2.2U 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 UYQ-016** 2.2 U 2.2 U 2.2 U 2.2 U 2.2U 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 UYQ-017** 2.1 U 2.1 U 2.1 U 2.1 U 2.1U 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 UYQ-018** 2.2 U 2.2 U 2.2 U 2.2 U 2.2U 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 UBackground Stations – Outside of ODMDSYQ-026 2.2 U 2.2 U 2.2 U 2.2 U 2.2U 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 UYQ-022 2.1 U 2.1 U 2.1 U 2.1 U 2.1U 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 UYQ-06 2.2 U 2.2 U 2.2 U 2.2 U 2.2U 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 UYQ-010 2.2 U 2.2 U 2.2 U 2.2 U 2.2U 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 UYQ-020 2.1 U 2.1 U 2.1 U 2.1 U 2.1U 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 UYQ-027 2.2 U 2.2 U 2.2 U 2.2 U 2.2U 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 USEF SL 9.5 2.8 1.9 -- 1.5 -- -- -- -- -- 16 9 12

### Appendix C, Yaquina River ODMDS Evaluation/EA C-25 

# D ISCUSSION AND 

# C ONCLUSIONS

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

EPA and the USACE need to consider the fo llowing 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 an d 2008, respectively. Sampling and analyses of

sediments were conducted in accordance with the SEF (2009) and included t esting for metals, TOC, pesticides, PCBs, phenols, phthalates, misc ellaneous 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 sa mples were submitted for physical analyses, with five samples collected from finer-grained areas furthe r 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 belo w the SEF SLs. The data from samples collected during 2010 were consistent with historical samp ling results. The material within the federal navigation channel and South B each 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 wh ere 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 concen trations 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 organo tin (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 stati ons were below SEF SLs. Althou gh 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, hept achlor, hexachlorobenzene, hexachlorobutadiene, and n-nitrosodiphenylamine. The sediments in th e 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 

# R EFERENCES

EPA and USACE (U.S. Environmental Protection Agency and U.S. Army Corps of Engineers). February 1998. Evaluation of Dredged Material Proposed for Discharge in Inland and Near Coastal Waters - Testing Manual (referred to as the “Inland Testing Manual”).

Fuhrer, G.J. and F.A. Rinella. 1983. Analyses of Elutriates, Native Water, and Bottom Material in Selected Rivers and Estuaries in Western Oregon and Washington. U.S. Geological Survey Open File Report 82-922.

Michelsen, T., T.C. Shaw, and S. Stirling. 1996. Testing, Reporting, and Evaluation of Tributyltin Data in PSDDA and SMS Programs. Puget Sound Dredged Disposal Analysis (PSDDA) Issue Paper and Sediment Management Standard s (SMS) Technical Information Memorandum.

Nelson, P.O., C.K. Sollitt, K.J. Williamson and D.R. Hancock, 1983. Coos Bay Offshore Disposal Site Investigation Interim Report, Phase II-III, C oos Bay Offshore Disposal Site Investigation Interim Report, Phase II-III April 1980-June 1981. Report to U.S. Army Corps of Engineers, Portland District, Portland, OR, under contract no. DACW57-C-0040, Oregon State University, Corvallis, OR.

SEF (Sediment Evaluation Framework). May 2009. Se diment Evaluation Framework for the Pacific Northwest. Prepared by U.S. Army Corps of Engineers Seattle, Portland, and Walla Walla Districts and Northwestern Division; U.S. Environmental Protection Agency Region 10; Washington Departments of Ecology and Na tural Resources; Oregon Department of Environmental Quality; Idaho Department of E nvironmental Quality; National Marine Fisheries Service; and U.S. Fish and Wildlife Service.

USACE. April 2009. Biological Assessment for Coastal Dredging Projects. Portland District.



### USACE. January 2010. Study Status Information Re port, Yaquina Bay. Portland District, Portland,

OR. Located at http://www.nwp.usace.army.mil/docs/d_sediment/odmds/Yaquina_AMR.pdf (accessed August 2011).

USACE (U.S. Army Corps of Engineers). Se ptember 2010. Yaquina Bay Sediment Quality Evaluation Report. Portland District. Located at http://www.nwp.usace.army.mil/environment/sediment.asp (accessed August 2011).

USACE and EPA (U.S. Army Corps of Engineers and U.S. Environmental Protection Agency). February 1991. Evaluation of Dredged Material Proposed for Ocean Disposal – Testing Manual (referred to as the “Ocean Testing Ma nual” or “Green Book”) located at http://www.epa.gov/owow/oceans/gbook/ (accessed August 2011).

USACE and EPA. 2001. Yaquina Bay Interim Ocean Dredged Material Disposal Site Evaluation Study and Environmental Assessment. Portland District and EPA Region 10. Located at http://www.nwp.usace.army.mil/environment/sediment.asp (accessed August 2011).

USACE and EPA. March 2011. 2008 Monitoring Studi es at Yaquina Bay Ocean Dredged Material Disposal Sites (ODMDS). Final Data Report. Portland District and EPA Region 10.