L-20-005, ISFSI, Revision 10 to the Updated Final Safety Analysis Report, Figures 2.6-1 to 2.6-20
| ML20281A413 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay |
| Issue date: | 09/03/2020 |
| From: | Pacific Gas & Electric Co |
| To: | Office of Nuclear Material Safety and Safeguards, NRC/OCM |
| References | |
| HIL-20-005 | |
| Download: ML20281A413 (20) | |
Text
Area of ins et E UR E K A B uhne PG&E property boundary Units 1 and IS FS I Unit 3 Plant S ite PACIFIC OCEAN N
0 2 mi 1
0 3 km 1
2 0
0.5 mi 0
0.5 km FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-1 TOPOGRAPHIC MAP OF HUMBOLDT BAY SHOWING LOCATION OF THE HUMBOLDT BAY ISFSI SITE PLANT LOCATION DRAINAGE AND TOPOGRAPHY Revision 0 January 2006
S O U T H S P I T K ing S almon Plant FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-2 SOUTH HUMBOLDT BAY VIEW IS SOUTHEAST Revision 0 January 2006
FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-3
Color shaded-relief map (oblique Mercator projection) of the Cascadia subduction zone along the northwest coast of the United States and Canada (from R.A. Haugerud, 1998, USGS Open-File Report 98-140).
Cas cadia S ubduction Zone S an Andreas Fault S ys tem Mendocino Fault 60N 120W 140W 160W 180W 50N Revision 0 January 2006
NOR TH AME R ICAN PLATE PACIFIC PLATE PACIFIC PLATE J UAN DE FUCA PLATE WAS HINGTON OR E GON NE VADA CALIFOR NIA CANADA ME XICO Mendocino Fault Zone GOR DA PLATE Gor d
a R
i s
e B l a
n c
o Fau lt J ua n d e
F uca R is e C
a s
ca di a
S u
bduction Zone IS FS I S ite Humboldt Bay PAC I F I C OC E AN (fixed)
VIZCAINO B LOCK Charlotte Fault Q
u e
e n
0 100 200 mi 0
100 300 km 200 E XPLOR E R PLATE Triple Junction E xplorer R idge S an An d
re as F
a u
l t
S y s
t e
m ME NDOCINO TR IPLE J UNCTION R E GION A'
A FSAR UPDATE HUMBOLDT ISFSI FIGURE 2.6-4 General plate tectonic setting of the western United States. Humboldt Bay and the proposed ISFSI site are on the western edge of the North American plate, at the north edge of the Mendocino triple junction region. Three plate-bounding fault zones, the San Andreas and Mendocino transform fault zones and the Cascadia subduction zone, intersect at the triple junction. Cross section A-A' is shown on Figure 2.6-10b.
Revision 0 January 2006
0 200 mi.
0 300 km FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-5 TECTONIC EVOLUTION OF THE WEST COAST UNITED STATES DURING PAST 50 MILLION YEARS (FROM NATIONAL GEOGRAPHIC SOCIETY, 1995)
Revision 0 January 2006
PAC I F I C OC E AN OR E GON CALIFOR NIA NOR TH AME R ICAN PLATE GOR DA PLATE U
D PACIFIC PLATE Humboldt Punta Gorda Bay E E L R IVE R S UB PLATE Maacam a
Fa ul t
B ar tle tt S
p rings Fault Lake Mo unt a
in Fa ul t
Lit tl e
S a
l m
o n
Fa ult Z
o n
e B ear R iv er S
h e
ar Zo n
e Mad R i ve r
Fault Zo ne Little S almon Fault S ys tem Cas cadia S u b
duction Zone E el R iver S egment Petrolia S egment Mendocino Fault Zone Garbervill e Fault PAC I F I C OC E AN 0
25 50 mi 0
25 75 km 50 IS FS I S ite FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-6 MAP OF SUBPLATES IN THE NORTH AMERICAN PLATE AND MAJOR FAULTS IN NORTHWESTERN CALIFORNIA Revision 0 January 2006 OLIA S UB PLATE
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S an A
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a s
F au lt Z
one
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l l
l l
l l
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l l
l l
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l l
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l l
l l
l l
l l
l l
l l
l l
l l
l l
l l
l l
l l
l l
l l
l l
l San And rea s F aul t Z o
ne Blanco Fault Blanco Fracture Zone OR E GON CALIFOR NIA NORTH AMERICAN PLATE PACIFIC PLATE G
o rd a
Rise C
a s
c a
d i
a S
ub du ction Zone Crescent City RIGID GORDA PLATE Gorda-GDZ Transition GORDA DEFORMATION ZONE Mendocino Fault Zone M 4-4.9 (1990-1999)
M 5-5.9 M 6-6.9 M 7-7+
(1950-1999)
Gorda Plate Seismicity 0
1 2
3 4
5 6
Age (million years) 1 4
2 2A 3
3A l l Anomaly l l 127°W 126°W 125°W 40°N 41°N 43°N 42°N N
75 Km 50 mi 0
0 Humboldt Bay IS FS I S ite FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-7 Tectonics of the Gorda plate (Modified from Wilson, 1989, Figure 3). The deforming and seismically active southern part of the plate and the internally rigid northern part are separated by a narrow transition that strikes northwest and intersects the subduction zone a short distance northwest of Humboldt Bay.
Revision 0 January 2006
FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-8 Schematic maps showing the components of the Little Salmon fault system. The Little Salmon fault zone is part of a system of active folds and reverse faults, the Little Salmon fault system, which extends for 330 kilometers from its intersection with the Freshwater fault northwestward to its intersection with the Thompson Ridge fault off the coast of southern Oregon. The Little Salmon fault zone, which is the closest capable fault to the Humboldt Bay ISFSI site, is 95 kilometers long (including the offshore traces as mapped by Clarke (1992) and the Yager fault). The Little Salmon fault zone contains multiple subparallel surface traces. Near the Humboldt Bay ISFSI site, the Little Salmon fault zone includes two primary traces, the Little Salmon fault and the Bay Entrance fault, and three subsidiary faults in the hanging wall, the Buhne Point fault, the Buhne Point splay fault, and the Discharge Canal fault.
0 0
30 Kilometers 30 Miles
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Mendocino S an Andreas F ault Zone C ape Mendocino IS F S I S ite L ittle L IT T L E S A L MON C AS C ADIA S UB DUC T ION ZONE S Y S T E M F AUL T S almon F ault Zone Y ager F ault F res hwater F ault Mad R iver F ault Zone Dis continuity Thomps on R idge Fault OR E GON CALIFOR NIA F r e
s hw a
t er S yncline F ault Zone S tructural Dis charge Canal Fault to Carlotta 12 km 1980 T T
E a s
t W
e s
t Central Zon e
T ra c
e T
r a
c e
E a s
t T
ra c
e Central Zon e
T r
a c
e W
e s
t B ay E nt ra n
c e
Fa ult Little S almon Fault Little S almon Fault B ay E nt ra n
c e
Fa ult E XPLANATION Fault (projected surface 0
2000 4000 ft 0
1000 m 500 B uhne Point B uhne Point Dis charge Canal Fault B
uh n
e Po in t
F au lt B
uh n
e Po in t
F au lt IS FS I S ite Revision 0 January 2006
S eg me n
t S tructur al Discontinuity Fre s
h w
a t
e r
E el R
i v
e r
S yn cli ne Gorda - GDZ
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Fa ul t
B ea r
R i
ver S hear R
u s
s Little S almon Fault Zone LITTLE S ALMON R UPTUR E C
as ca d
i a
Trans ition S yncline AR E A Mendocino Fault Zone S outhern Limit CS Z R upture E
aster n Lim it C S Z R u ptur e
Mad R iver S lough trees E ureka Petrolia AR E A R UPTUR E E E L R IVE R S E GME NT R iver Mad Fault Zone FAULT S YS TE M E el R iver trees S e gm ent Big Lagoon PACIFIC PLATE PE TR OLIA S UB PLATE E E L R IVE R S UB PLATE S an Andr ea s
Faul t Z on e
Garbervil le Fa ul t
NORTH AMERICAN PLATE GOR DA DE FOR MATION ZONE Lake Mtn F ault 1992 Petrolia earthquake rupture area R IGID GOR DA PLATE Table Fault B luff N
0 10 30 Km 20 0
5 15 Mi 10 FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-9
Major active faults and known or inferred earthquake rupture areas (line pattern) in the Mendocino triple junction region (stippled area). Paleoseismic data indicate the Little Salmon fault system ruptured during a great Cascadia subduction zone (CSZ) event, which may have ruptured as far as the southern limit of the CSZ, 300 years ago, and that the Eel River segment ruptured independently less than 200 years ago.
Punta Gorda S u bd uc ti o
n E el R iv er S
e g
m Zone Revision 0 January 2006 IS FS I S ite
Axis of Aleutian trench E dge of continental shelf Patton Bay fault Volcanic arc S E NW
-2 0
4 8
12 S urface displacement (m)
Depth (km)
Distance perpendicular to zero isobase (km) 150 100 50 0
Inferred underthrust dir ection North American plate North American plate Pacific plate Pacific plate 200 100 100 200 0
Mt. S hasta Wes t A
E as t A'
Oceanic crust Gorda rise Mesozoic accreated crust Paleozoic accreated crust Mesozoic intrusions Marine sediments Basaltic magma North American plate Volcanic rocks S ediments Andesitic magma Normal faults Normal faults Thrust faults Megathrust S trike-slip faults Asthenosphere 150 0
50 100 Pacific plate Ocean Partial melting of upper part of subducted plate S ubducted Gorda plate Figure 2-6 Depth (km) 0 100 200 300 400 500 600 Distance (km)
Inferred faulting Possible faulting Possibly did not slip 40 30 20 10 0
-10 S urface displacement (ft.)
Depth (mi) 0 20 40 60 80 100 0
50 km 0
30 mi 0
50 km 0
30 mi FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-10
Schematic cross section showing the suggested mechanisms for the 1964 Alaska earthquake (Plafker, 1972), and postulated Cascadia subduction zone earthquake sources.
a) 1964 Alaska Earthquake Sources b) Cascadia Subduction Zone Earthquake Sources.
Location of cross section A-A' shown on Figure 2.6-4.
Revision 0 January 2006
FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-11 Generalized regional geologic map showing principal faults and folds, area of active Mendocino uplift (stippled pattern), and major plates (after McLaughlin and others, 2000). Cross section A-A' is shown on Figure 2.6-12. Details of faulting in the vicinity of Humboldt Bay area shown on Figures 2.6-13 and 2.6-18.
Late Cenozoic (Neogene) overlap deposits Coast R anges terrane King R ange terrane False Cape terrane Yager terrane Central Belt Yolla Bolly terrane Pickett Peak terrane Western Klamath terrane R attlesnake Creek terrane Western Hayfork terrane E astern Hayfork terrane Area of active Mendocino uplift QTw cr kr fc y
cb yb pp wkt rct wht eht E XPLANATION Coastal Belt Revision 0 January 2006 CO A
S T
A L
B ELT TH R
U S T S A L
T CRE E
K F
AULT FRE S
H W
A T
E R
F A
ULT Gut h
r i
e C
re e
k False Cape Devils Gate Cape Mendocino NORTH AMERICAN PLATE COAS T A
L B
E L
T TH R
U S
T COAS T AL B
E L
T T
H R
U S
T M
U LE R
I D
GE F A
U L
T Z
O N
E S O UT H
F O
R K
FA ULT S U L
P H
U R
C R
E E
K T
HRU S T MUL E
RI DGE F A
U LT Z O
N E
PET R
O L
L T Z O
N E
KI N
G RANGE GRO G
C A
P E
F A U LT GORDA PLATE C A S
C A
D I A Y AGER FAULT LITTLE SALMON FAULT ZONE FAULT BLUFF TABLE U
S F
A ULT THRUS T
ZONE R
S F
ic k
le H
ill Ridge Petrolia Butte Granite Devils Elbow Red Mountain K ettenpom Island Mtn.
Harris Garberville Alderpoint Fort Seward Bear Buttes Lassic Red Black Lassic Ettersburg Panther Gap Pt. Delgada Whale Gl.
Phillipsville Zenia PINE BUTTE FAULT RED M
OUN TIAN FAULT SAN ANDREAS FAULT ZONE Honeydew Bridgeville Benbow Garbe rv ille S ynform FAULT ZONE MENDOCINO FRACTURE ZONE PACIFIC PLATE Bull Creek WIL S
O N
P O
I N T
T H R
US T
Garberville A
ntif orm Arcata Eureka Lake Mtn.
Cooskie Creek K ing Peak cb cb cb fc kr cr y
y y
cr cb yb rct wht eht wkt QTw QTw QTw pp 123° 40° 41° 40.5° 125° 124° 124° 40° 125° 40.5° 123° MAP LOCATION CALIFORNIA MAD RIV ER FAULT ZONE B
yb GARBERV ILLE BEAR RIV ER ZONE FAULT A
S U B D U
C T I O
N Z
O N E N
IS FS I S ite 0
15 mile 0
15 kilometer A
A'
FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-12 Generalized regional structure section A-A' showing depth distribution of epicenters (open circles) and selected focal mechanisms (beach balls) of earthquakes from M. Magee (Stanford University and USGS), 1994 (after McLaughlin and others, 2000). The location of cross section A-A' is shown on Figure 2.6-11.
Pacific
- Farallon Plate Gorda Plate Gorda Plate King R ange Terrane Gorda Plate
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False Cape Terrane?
Coast R anges Terrane Mendocino Uplift S an Andreas Fault Cooskie Fault Zone Honeydew Fault Zone Petrolia Fault Zone Bear R iver Fault Zone E el R iver Basin False Cape Terrane?
Coastal Terrane?
Coastal Terrain?
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Yager Terrane?
QT QT QT Yager Terrane
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Possible S lab Gap?
A A'
0 10 20 30 40 50 60 Dis tance (km)
-10 0
0 5
10 15
-20
-26 Depth (km)
Depth (mi)
R uss Fault Zone S outh edge, Gorda Plate (from J achens and Gris com, 1983)
Continental moho
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Oceanic moho Coast R ange Ophiolite?
Franciscan Complex Great Valley S equence Overlap Deposits (Oligocene and younger)
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VIZCAINO B LOCK
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Little S almon Fault Zone (Henstock and others, 1997)
Oceanic Mantle (Henstock and others, 1997)
Notes:
Focal mechanisms are depicted as spheres viewed from the southeast; black sectors are tensional, white sectors compressional. Location data and focal mechanisms from M. Magee, S tanford University/US GS (1994).
0 5 mi 0
8 km Revision 0 January 2006
Zone Fals e Cape B ear R ive r
Fault Zone Qal Qs Qs Qhc Qhc Qhc Qhc Qhc Qhc Qhc Qhc Qhc Qal
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Qal Qal Qal Qal Qtf Qal Qal Qal Qf Qal Qal Qal Qal Qal Qal Qal Qtf QTr QTr QTr Qtf Qtf Qtf Qtf Qtf Qtm Qtm Qtm Qtm Qtm Qtf Qtm Qtm J ms J ms J ms QTcs QTcs QTcs QTcs QTcs QTcs QTcs QTcs Qtm Qtm Tmm Tmm Tf3 Tf3 Tf2 Tf2 Tf2 Tf2 Tf2 K f1 K f1 K f1 K f1 K f1 Tf2 Tf2 Tmm Tmm Tmm Tmm Tmm Tmm Tmm Tmm Tmp Tpm Tmm Qs Qs Qf Qf Qf Qf Qf Qf Qf Qf COAS TAL B E LT AND OVE R LYING S E DIME NTS upper Pleistocene and/or Holocene dune and beach sand upper Pleistocene and Holocene alluvium upper Pleistocene fluvial terraces middle and upper Pleistocene marine terraces Pleistocene nonmarine and shallow water marine sediments (Hookton Formation and/or Carlotta Formation)
Plio-Pleistocene nonmarine sediments (Carlotta Formation and/or S cotia Bluffs Formation) upper Pliocene and lower Pleistocene marine sediments (R io Dell Formation) lower and middle Pliocene marine sediments (E el R iver Formation) upper Tertiary marine sediments (lower Wildcat Group) upper Miocene marine sediments (Pullen Formation) lower Tertiary Coastal Belt Franciscan Complex and Yager Formation Qs Qal Qtf Qtm Qhc QTcs QTr Tpm Tmm Tmp Tf2 ADJ ACE NT AR E AS upper Pleistocene and/or Holocene dune and beach sand upper Pleistocene and Holocene alluvium upper Pleistocene fluvial terraces middle and upper Pleistocene marine terraces lower and middle Pleistocene marine and nonmarine (Falor Formation)
Pleistocene nonmarine sediments (Carlotta Formation) upper Tertiary marine sediments (lower Wildcat Group)
Cretaceous Central Belt Franciscan Complex Pre-Cretaceous (Jurassic ?)
metasedimentary rocks (S outh Fork Mountain S chist) lower to middle Tertiary Coastal Belt Franciscan Complex Qs Qal Qtf Qtm Qf Qc Tmm K f1 J ms Tf3 QUATE R NAR Y TE R TIAR Y CR E TACE OUS 40°30' 124° PR E -CR E TACE OUS Wildcat Group QUATE R NAR Y AND TE R TIAR Y E XPLANATION Faults: teeth on upper plate of thrust fault; arrows indicate sense of strike slip; dashed where location uncertain; dotted where buried or concealed Anticline Anticline, overturned S yncline Location of geologic cross section (Figure 3-4)
Location of McKinleyville trench (Woodward-Clyde Consultants, 1980)
R us s Fault R us s Fault Fres hwater Fault Fres hwater Table B luff Table B luff Fres hwater S outh B ay S yncline S yncline E el Fals e Cape Fault Fault Fault Zone Fault Fault Little Little Grogan Fault Grogan Lake Mountain Fault Lake Mountain Fault Fault IS FS I S ite Mad R iver Fault Zone Mad R iver Fault Zone H U MB OL D T B AY P AC I F I C OC E AN Eureka False Cape Cape Mendocino Ferndale Arcata McKinleyville 0
0 10 Kilometers 5.0 Miles B
B '
B '
B B ear R ive r
Fault Zone Mckinleyville Trench FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-13 GEOLOGIC MAP OF THE HUMBOLDT BAY REGION Revision 0 January 2006
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E levation, meters x1000 2
0 (sea level)2 4
6 8
10 12 14 16 E levation, feet x1000
( sea level ) 0 1
2 3
4 5
6 7
8 9
Tf3 Tf3 Tf2 QTcs Qal Tf2 Tf2 Tpm Tf3?
Tf3?
Tf3?
K f1 K f1 K f1 Tf2 Tmm Tmp Qtr Qhc Qhc Qal Qal Tmm Bear R iver Fault Zone R uss Fault E el R iver Basin Table Bluff Fault Little S almon Fault Zone Greenwood Heights Fault Freshwater Fault Mad R iver Fault Zone Vertical = Horizontal B
S outhwes t B '
Northeas t Fickle Hill Fault Mad R iver Fault McKinleyville Fault Blue Lake Fault Trinidad Fault Little S almon Fault S ystem Qal 0
5000 m 0
16,000 ft FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-14 Geologic cross section of the Humboldt Bay Region. See Figure 2.6-13 for description of stratagraphic units. The location of cross section B-B' is shown on Figure 2.6-13 False Cape Fault Revision 0 January 2006
FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-15 COMPOSITE STRATIGRAPHIC COLUMN, ONSHORE EEL RIVER BASIN (AFTER CLARKE, 1992)
Revision 0 January 2006 S cotia Bluffs Formation 3650
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Carlotta Formation Hookton Formation (in this report) 0 R io Dell Formation E el R iver Formation Pullen Formation Yager Terrane Wildcat Group Falor Formation (Mad R iver Valley)
Coastal Terrane Faulted
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Central Belt Coastal Belt Franciscan Complex CR E TACE OUS TO MIDDLE JUR AS S IC AGE mya*
mya*= million years ago QUATE R NAR Y 600 765+
150+
TE R TIAR Y THICKNE S S (Meters)
Paleocene E ocene Miocene Pliocene Pleistocene Holocene 1.6 5
[23
á38 65 54
A) View north along Highway 101 with Humboldt Hill in the distance.
B) Closer view of the S wiss Hall paleoseismic study site.
FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-16 Oblique aerial views looking north along the Humboldt Hill anticline and the Little Salmon fault zone. (Photographs taken July 25, 2000, by W.D. Page).
S wis s Hall s ite Highway 101 S wis s Hall S ite Humboldt Hill Revision 0 January 2006
0 3 mi 0
5 km Humboldt Hi ll Anticl in Humboldt Hill Anticline L
itt le S alm on Fa u
Table B luff Anticline E XPLANATION Faults: teeth on upper plate of thrust fault; arrows indicate sense of strike slip; dashed where location uncertain; dotted where buried or concealed Anticline Anticline, overturned S yncline Terrace
Isotope
Approximate Name
S tage
Age (x 1000 yrs.)
Patricks Point
4a
64 S avage Creek
5a
83 McKinleyville
5b
96 Westhaven
5c
103 Fox Farm
5d
120 S ky Horse
5e
130 A - Line
7a?
176 Older and much
older Terraces
200+
IS FS I S ITE E ureka Arcata A R C A T A B A Y H U M B O L D T B A Y P A C I F I C O C E A N E el R iver F
res h wa t
e r
S y ncl in e
E ureka A nti cli n
e S o ut h
B ay S
y n
L itt le S alm on Fa u
Table B luff Fault Humboldt Hill Anticline Table B luff Anticline Approximate 0
3 mi 0
5 km FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-17 MARINE TERRACE MAP OF THE HUMBOLDT BAY REGION Revision 0 January 2006
to Carlotta 12 km FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-18 SURFACE TRACES OF THE LITTLE SALMON FAULT ZONE SOUTH OF THE ISFSI SITE Revision 0 January 2006 Brazil Property, WCC, 1980 College of the Redwoods trenches LACO, 1999b College of the Redwoods WCC, 1980 Quarry exposure ESA 1977 Carver and Burke, 1988 Swiss Hall site Witter and Others, 2002 DISCHARGE CANAL FAULT Ea st W
es t
Central Zon e
Tr a
c e
T r
a c
e ISFSI SITE Ea st Tr a
c e
Central Zon e
T r
a c
e W
es t
DISCHARGE CANAL FAULT B
u h
n e
Po in t
Fa ul t
B u
h n
e Po in t
Fa ul t
Bay E ntra nc e
Fa ul t
ISFSI SITE Little Salmon Fault Little Salmon Fault Bay E ntra nc e
Fa ul t
N EXPLANATION Fault (projected surface trace) 0 2000 4000 ft 0
1000 m 500 Buhne Point Splay Fault Buhne Point Splay Fault
R IO DE LL FOR MATION (VE NTUR IAN)
E E L R IVE R FOR MATION (R E PE TTIAN)
R IO DE LL FOR MATION (VE NTUR IAN)
E E L R IVE R FOR MATION (R E PE TTIAN)
Humboldt Hill WCC-118 Note: Location of cross section shown on Figure 4-1.
Humboldt Bay FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-19 Cross section A-A' across the Little Salmon fault zone at Humboldt Hill (after Woodward-Clyde Consultants, 1980, Figure C-15).
A A'
Revision 0 January 2006
FSAR UPDATE HUMBOLDT BAY ISFSI FIGURE 2.6-20
Geologic cross section A-A' across a trace of the Little Salmon fault zone at College of the Redwoods, 5 kilometers south of Humboldt Bay ISFSI site (after LACO Associates, 1999b, Figure 5). Location of cross section shown on Figure 2.6-18.
E XPLANATION ALLUVIUM 2 - OLDE R FAN DE POS ITS ALLUVIUM 1 - FLUVIAL OR OLD BAY DE POS ITS MAR INE TE R R ACE DE POS ITS - 2 CONVE NTIONAL 14C AGE OF 27,730 +/- 170 YE AR S BP Qal 2 Qal 1 Qtm 2 A
0 100 Feet 0
30 Meters S cale vertical = horizontal Revision 0 January 2006