Conceptual Site Models

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21 Φεβ 2014 (πριν από 3 χρόνια και 6 μήνες)

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Columbia River Overview


Superfund Process


Conceptual Site Models


Data Gap Analysis


Columbia River Surface Water Hydrology Plays
a Critical Role in Sedimentation



Flow rates


High flows within
the Hanford section
results in minimum
sedimentation


Major river
confluences


Yakima


Snake


Walla Walla

S

S

S

S

S

S

S

S

S

S

S

The Majority of the Hanford Reach is a Non
-
Depositional Area

S

S

S

S

S

S

S

S

S

S

S

The Majority of the Hanford Reach is a Non
-
Depositional Area

USGS Annual Statistics

Average

Flow (cfs)

Suspended

Load (Kg/m
3
)

River


0.06

3,512

Yakima


0.016

54,830

Snake


0.00375

117,480

Columbia

(Priest Rapids Dam)


568


2366


1188

Estimated

Suspended
Sediment Load


(tons/day)

Yakima

Snake

Walla Walla

Columbia

Flow average 117,480 cfs

(1188 tons/day)

Columbia

Yakima

Walla Walla

Flow average 54,830 cfs

(2,366 tons/day)

Snake

Snake

Columbia

Walla Walla

Flow average 13,512 cfs

(568 tons/day)

Yakima

Yakima

Snake

Columbia

Flow average 568 cfs

Walla Walla

McNary Dam currently has approximately
30ft of sediment


Average Annual Deposit
Rate is 2 to 7 in/yr

2000

1990

1980

1970

1960

1950

Est. 30 ft

Sediment

}

90 ft

Water

Conceptual
Exposure Model


Primary
Sources

Medium of
Concern

Exposure
Point

Potential
Exposure
Route

Potential Receptors







Rural
Residents


Native
American



Industrial
Worker

Monument
Worker

Avid
Angler

Casual
User

Ecological
Receptors

Area
100/300

Sediment

Near shore
and
islands

Ingestion















Dermal
Contact















Surface
water

River
water


Ingestion





















Dermal
Contact
















What is a CEM?



Sources


Migration pathways


Receptors


Exposures

Sources of Contaminants to the River


Upriver Sources


Hanford Reach Sources


Downriver Sources

Generic Hanford Conceptual Site Model

Historic cooling

water discharge

GW seeps

Reactors/

Operational

Areas

Conceptual Site Model


Cross Section

Cross section illustrates:


Sources


Migration pathways


Receptors: people, benthic, fish, etc.


Potential Exposure Points

Receptors

Source

Cooling water

Columbia River

Site Conceptual Model


Recreational Islands

Receptors

Source

Cooling water

Columbia River

Columbia River

Conceptual Site Model


Richland Area

Agriculture

Beach

Industry

House

Industrial

discharge

Water Intake

Structure

Water supply

Water supply

Columbia River

Irrigation

discharge

Columbia River

West

East

CRC Study Area

Study Area Cross
-
Section

Hanford Site

100/300 Study Area

and Inter
-
Area

Green line