MEMORANDUM · FROM: Stephen J. Cullen, PG, PhD Gregory Schnaar, PhD ... and orientation of the Arroyo Parida Fault zone based on fault investigations and engineering

1

D a n i e l B . S t e p h e n s & A s s o c i a t e s , I n c .

MEMORANDUM

TO: Al Preston, PE, PhD, Geosyntec Brandon Steets PE, MS, Geosyntec CC: Kevin DeLano, MS, State Water Resources Control Board FROM: Stephen J. Cullen, PG, PhD Gregory Schnaar, PhD Shannon Williams, CPG, MS DATE: August 16, 2018

SUBJECT: Geologic Analysis, Ventura River Watershed [PRELIMINARY/DRAFT]

BACKGROUND

This memorandum summarizes geologic analysis performed for the Ventura River Watershed (VRW) by Daniel B. Stephens & Associates, Inc. (DBS&A) in support of numerical model development. The geologic analysis presented herein will be used to assign three-dimensional model layer geometry, initial model hydraulic properties (e.g., hydraulic conductivity), and the presence of boundary conditions representative of faults that may provide a barrier to groundwater flow.

GEOLOGIC ANALYSIS

The geologic analysis was performed by mapping the three-dimensional extent of surficial geologic units within the VRW, and results were plotted on a series of geologic cross-sections. Cross-section locations are shown on Figure 1, and were placed in order to be consistent with previous cross-sections developed in the VRW, and to follow the main surface-water bodies. The horizontal extent and depth of the geologic cross-sections were also determined based on the presence and depth of water supply wells in the watershed. Figure 2 displays the presence of, and indicates the depth of, wells within the VRW based on data received from VCWPD (2018). The geologic cross-sections are presented in Figures 3 through 8.

Specifically:

• Section A-A’, Figure 3, was located to follow the main stem of the Ventura River and continue to the north to the area of supply wells located along North Fork Matilija Creek; within the Upper Ventura River Basin this location is coincident with section A-A’ from KG (2016a).

2


• Section B-B’, Figure 4, was located to pass through the Upper Ventura River Basin and into the Ojai Valley Basin; this section is coincident with section B-B’ from KG (2016a) within the Upper Ventura River Basin and section A-A’ from DBS&A (2011) within the Ojai Valley Basin.

• Section C-C’, Figure 5, was located to follow San Antonio Creek, and is coincident with section C-C’ from DBS&A (2011) within the Ojai Valley Basin.

• Section D-D’, Figure 6, was located to run south-to-north from the area south of the Upper Ojai Valley Basin (where several supply wells are located) to the Upper Ojai Valley Basin, and then through the Ojai Valley Basin. This section is coincident with section B-B’ from DBS&A (2011) within the Ojai Valley Basin.

• Section E-E’, Figure 7, was located to pass through the widest area of alluvium in the Lower Ventura River Basin, and is also located based on availability of boring-log data.

• Section F-F’, Figure 8, was located to pass through the Upper Ventura River Basin, and the areas of alluvium associated with San Antonio Creek, Lion Canyon Creek, and the Upper Ojai Valley Basin; this section is coincident with Section C-C’ from KG (2016a) within the Upper Ventura River Basin and the area around San Antonio Creek.

Geologic maps, boring logs, existing geologic studies and cross-sections, and the current Bulletin-118 Basin boundaries (DWR, 2016a) were reviewed in order to assess the extent of surficial geologic units. Previous studies of the extent and thickness of alluvium in the basins include Turner (1971), SGD (1992), Fugro (2002), HGC (2007), DBS&A (2011), and KG (2016a, 2016b). Previous studies of bedrock geology in the watershed consulted also included DWR (1933), Rockwell et al. (1984) and CDOG (1991). Boring logs were available from DWR (2018), VCWPD (2017), HGC (2007), KG (2018), and from Cleanup and Waste Discharge Sites on the GeoTracker website (SWRCB, 2018). Wells used in the geologic analysis are displayed on Figure 9, and those wells projected on the geologic cross-sections are also displayed on Figure 1. Where multiple wells are present in the same general location and would overlap if projected onto the cross-sections, the well with the most detailed geologic log available was projected. All well logs used in this geologic analysis have been compiled and are available upon request. Two geophysical surveys in the vicinity of the Ventura River were also referenced (Fugro, 2002; AGI, 2014) and locations are shown on Figure 9.

Geologic maps used in the analysis include the East Half Santa Barbara 30’ x 60’ Quadrangle prepared by the California Geologic Survey (Gutierrez et al., 2008; shown on Figures 10a and 10b), the Eastern Three-Quarters of the Cuyama 30’ x 60’ Quadrangle prepared by the U.S. Geologic Survey (Kelogg et. al, 2008; shown on Figures 11a and 11b), and a tectonic and physiographic map of the White Ledge Peak and Matilija Quadrangles prepared by the U.S. Geologic Survey (Minor and Brandt, 2015; shown on Figure 12).

3


The first step in the geologic analysis was estimation of the horizontal extent and thickness of undifferentiated alluvium and identification of areas understood to exhibit saturated conditions within at least a portion of the vertical alluvium profile. The current Bulletin-118 groundwater basin boundaries are displayed on Figure 1, and are overlaid on geologic maps in Figures 10a, 11a and 12. The Bulletin-118 boundaries largely correspond to the extent of surficial alluvium, excluding thin alluvial channels that underlie streams in the mountain bedrock areas, the area of Lake Casitas, various areas of landslide deposits throughout the VRW, and areas where alluvium is considered thin and non-water bearing (e.g., alluvium to the east of the Ventura River in the vicinity of Section F-F’ that was formally included in the Upper Ventura River Bulletin-118 boundary prior to basin boundary modification in 2016, see KG, 2016a; DWR, 2016b).

In addition to the Bulletin-118 basins, perennially saturated alluvium is considered present in the vicinity of San Antonio Creek between the Ojai Valley and the Ventura River Basins and potentially in the area underlying Lion Canyon Creek between San Antonio Creek and the Upper Ojai Valley Basin.

Alluvial sediment thickness was estimated from review of boring logs, geophysical logs, and previous geologic studies. SWRCB performed the first round of review of boring logs available from Ventura County Watershed Protection District (VCWPD) in the Upper Ventura, Lower Ventura, and Upper Ojai Valley Basins and estimated the depth of alluvium for each well (DeLano, 2017). DBS&A reviewed the SWRCB analysis against available boring logs and previous geologic studies. Within the Ojai Valley Basin, previous analysis of geophysical logs from 24 wells located within the Basin was used to map alluvium thickness (DBS&A, 2011). The geophysical log analysis also identified the presence of aquifer and semi-confining units within the Ojai Valley Basin.

Kriging methods were used to interpolate the bottom-of-alluvium elevation throughout the watershed using bedrock elevation data from each well location for which lithologic data was present. Previously developed maps of bottom-of-alluvium elevation within the VRW developed by Turner (1971) and SGD (1992) were also used to inform the bottom-of-alluvium elevation. Figure 13 presents bottom-of-alluvium elevation contours developed using the kriging analysis. Figure 14 displays an isopach contour map of the resulting alluvium thickness.

Following mapping of undifferentiated alluvium, additional geologic analysis was conducted to map the three-dimensional extent of bedrock geologic units that are used for water supply in the VRW, and to map the presence of structural features (i.e., faults) that may influence groundwater flow. The bedrock geology analysis relied primarily on the available geologic maps (i.e., see Figures 10a, 11a, 12). When discrepancies in geologic interpretation occurred between the various maps, the newest geologic map covering an area was used. In cases where landslide deposits were mapped to cover bedrock on Gutierrez et al. (2008; see Figure 10a), older, preliminary geologic maps were referenced that did not include the landslide deposits (i.e., Dibblee, 1981, 1987a, 1987b). In addition, Gurrola (2018) and Rockwell et al. (1984) were referenced in regards to the orientation of the Arroyo Parida Fault and other nearby faults located along the Ventura River. Well logs were also consulted where available to confirm bedrock

4


lithology. Quaternary and Pleistocene alluvial deposits were delineated based on the age of mapped surface units on the respective geologic maps discussed above, and also based on previous cross-sections developed by Turner (1971).

Apparent dips of bedrock units were calculated using bedding strike and dip measurements nearest the unit contact and the Visible Geology web application (Visible Geology, 2018), which uses strike, dip, and cross-section bearing to calculate apparent dip. When dip measurements on faults were available, apparent dip of the fault was calculated using the same method. If fault dip measurements were not available, faults were interpreted to have similar geometry to other nearby faults that did have direct measurements. Finally, when surface geology was covered by alluvium and no well logs were available, descriptions of general unit thickness, described in the Los Angeles 30’ x 60’ Quadrangle pamphlet (Campbell et al., 2014) were used to approximate unit contacts under the Ojai Valley and Upper Ojai Valley Basins.

REFERENCES

Advanced Geoscience, Inc. (AGI), 2014. Draft Report, Geophysical Surveys for Investigation of Subsurface Geologic Conditions Near Well Numbers 1-4 at VRCWD Facility. Submitted to Ventura River Water District, August 29, 2014. California Department of Water Resources (DWR), 1933. Bulletin 46: Ventura County Investigation. California Department of Water Resources (DWR), 2016a. Bulletin 118, Interim Update 2016. URL: https://water.ca.gov/Programs/Groundwater-Management/Bulletin-118 California Department of Water Resources (DWR), 2016b. Basin Boundary Modification Request System, 4-003.01 Ventura River Valley - Upper Ventura River. California Department of Water Resources (DWR), 2018. Well Completion Reports, Well Completion Report Map Application. URL: http://wdl.water.ca.gov/groundwater/wells/well_completion_reports.cfm California Division of Oil and Gas (CDOG), 1991. Generalized Cross Section, Central Ventura River Basin, from California Oil and Gas Fields, Volume II: Southern, Central Coastal, and Offshore California. Publication No. TR12. California State Water Resources Control Board (SWRCB), 2018. GeoTracker. URL: https://geotracker.waterboards.ca.gov/ Campbell, R.H., Wills, C.J., Irvine, P.J., and Swanson, B.J., 2014, Preliminary Geologic Map of the Los Angeles 30’ x 60’ quadrangle, California: Department of Conservation, California Geological Survey in cooperation with United States Geological Survey, 85 p., 1 sheet, 1:100,000. Digital preparation by Gutierrez, C.I. and O’Neal, M.D. DBS&A, 2011. Groundwater Model Development, Ojai Valley Basin, Ventura County, California. November 15, 2011.

5


DeLano, K., 2017. Analysis of Ventura River Well logs by K. DeLano (SWRCB), submitted to Gregory Schnaar (DBS&A). Dibblee, T.W., Jr. 1981. Geologic Map of the Ojai Quadrangle, California. U.S. Geological Survey Open-File Report 82-74. Dibblee, T.W., Jr., 1987a. Geologic Map of the Matilija Quadrangle, Ventura County, California: Dibblee Geological Foundation, Map DF-13 (Ehrenspeck, H.E., ed.), scale 1:24,000. Dibblee, T.W., Jr., 1987b. Geologic Map of the Ojai Quadrangle, Ventura County, California: Dibblee Geological Foundation, Map DF-14 (Ehrenspeck, H.E., ed.), scale 1:24,000. Fugro West, Inc. (Fugro), 2002. Geophysical and Geotechnical Study, Proposed Siphon Beneath the Ventura River, Meiners Oaks Area, Ventura County, California. Prepared for Ojai Valley Sanitary District, September 2002. Gurrola, L. 2018. Personal communication to Stephen J. Cullen (DBS&A) describing the nature and orientation of the Arroyo Parida Fault zone based on fault investigations and engineering geological investigations performed in the Ojai valley and Matilija areas, letter dated June 18, 2018. Gutierrez, C.I., Tan, S.S., and Clahan, K.B., 2008, Geologic Map of the east half Santa Barbara 30’ x 60’ quadrangle, California: Department of Conservation, California Geological Survey, 11 p., 1 sheet, 1:100,000. Digital preparation by Gutierrez, C.I. and Toman-Sager, K. Hopkins Groundwater Consultants, Inc. (HGC), 2007. Preliminary Hydrogeological Study, Foster Park Wellfield Design Study, Ventura, California. Prepared for City of San Buenaventura, December 2007. Kear Groundwater (KG), 2016a. Memorandum re: Basin Boundary Modification, Upper Ventura River Basin (DWR Basin No. 4-3.01). Submitted to Bert Rapp, Upper Ventura River Basin GSA Formation Committee. Kear Groundwater (KG), 2016b. Memorandum re: Basin Boundary Modification, Ojai Valley Groundwater Basin (DWR Basin No. 4-2). Submitted to Jerry Conrow, President, Ojai Valley Basin Groundwater Management Agency. Kear Groundwater (KG), 2018. Well logs provided by Jordan Kear (Kear Groundwater) to Gregory Schnaar (DBS&A) via email. Kellogg, K.S., S.A. Minor and P.M. Cossette, 2008. Geologic Map of the Eastern Three-Quarters of the Cuyama 30’ x 60’ Quadrangle, California. U.S. Geologic Survey Scientific Investigations Map 3002. Minor, S.A. and T.R. Brandt, 2015. Geologic Map of the Southern White Ledge Peak and Matilija Quadrangles, Santa Barbara and Ventura Counties, California. U.S. Geologic Survey Scientific Investigations Map 3321. Rockwell, T.K., E.A. Keller, M.N. Clark, and D.L. Johnson, 1984. Chronology and rates of faulting of Ventura River terraces, California. Geological Society of America Bulletin, v. 95, p.1466-1474.

6


San Buenaventura Research Associates (SBRA). 2002. Historic resources evaluation, Avenue Water Treatment Plant, Ventura, California. May 14, 2002. Staal Gardener & Dunne, Inc. (SGD). 1992. Hydrogeologic investigation: Ojai ground water basin Section 602 and 603 study tasks, Ventura, California. Prepared for Ojai Valley Basin Ground Water Management Agency. December 1992. Turner, J.M. 1971. Ventura County Flood District Report on Ventura County Water Resources Management Study, Geohydrology of the Ventura River System: Ground Water Hydrology. Submitted to the Ventura County Board of Supervisors, May 1971. Ventura County Watershed Protection District (VCWPD), 2017. Well logs provided by VCWPD to the State Water Resources Control Board. Ventura County Watershed Protection District (VCWPD), 2018. Data on wells located within the Ventura River Watershed, provided via email by Barbara Council (VCWPD) to Gregory Schnaar (DBS&A), May 1, 2018. Visible Geology Web Application (Visible Geology), 2018. URL: https://app.visiblegeology.com/

Figures

LOWER VENTURA RIVER

UPPERVENTURA RIVER

OJAI VALLEY

UPPEROJAI VALLEY

UPPER AND LOWER VENTURA RIVER BASINS

BOUNDARY

Pacific Ocean

A’

D’

C’

C

D

E’

E

B’

B

A

F’

F

Foster Park Submerged Dam

Arroyo Parida Fault

Oak View Faults

Santa Ana Fault

Villanova Fault

MATILIJA CREEK

VE

NTU

RA

RIV

ER

SAN AN

TONI O

CREE K

N.F

OR

KM

ATIL

IJACR.

CAÑADA LAR

GA

CREE K

LION C ANYON CREEK

THACHER CREEK

Red Mountain Antic line

Ventura Anticline

Oxnardsyncline

Lake Casitas

Matilija Reservoir

K:\P

roje

cts\

Wat

er R

esou

rce

Serv

ices

\Pub

lic\D

B17.

1159

.00

Vent

ura

Riv

er W

ater

shed

Mod

elin

g\G

IS\M

XD

s\C

ross

-Sec

tions

_Mem

o\Fi

g01_

Cro

ss_S

ectio

n_Lo

catio

ns.m

xd T

CB

201

8081

5

Ventura River Watershed, GroundwaterBasin Boundaries, Major Geologic Structural

Features, and Cross Section Locations

Figure

1Santa Barbara

0 31.5 Miles

August 2018

Ventura County, CA

Daniel B. Stephens & Associates, Inc.

LegendWell projected onto cross-sectionCross sectionFault (Minor and Brandt, 2015)Fault (Gutierrez et al., 2008)Anticline or syncline (dashed whereconcealed)Ventura River watershedBulletin 118 (2016 Interim Update)groundwater basin

Data Sources: Gutierrez et al., 2008Minor and Brandt, 2015

Aerial imagery dated January 12, 2018 from Google Earth.

LOWERVENTURA

RIVER

UPPEROJAI

VALLEY

OJAIVALLEY

UPPERVENTURA

RIVER

Pacific Ocean

A

E

E’

F’

F

B

C’

D’

D

A’

B’

C

Lake Casitas

Supply Well DepthsVentura River Watershed

Figure

2Santa Barbara

0 2.51.25 Miles

K:\P

roje

cts\

Wat

er R

esou

rce

Serv

ices

\Pub

lic\D

B17.

1159

.00

Vent

ura

Riv

er W

ater

shed

Mod

elin

g\G

IS\M

XDs\

Cro

ss-S

ectio

ns_M

emo\

Fig0

2_W

ell_

Dep

ths.

mxd

TC

B 2

0180

713

July 2018

Ventura County, CA

LegendCross SectionVentura RiverStreamSurface Water BodyWatershed BoundaryBulletin 118 (2016 InterimUpdate) groundwater basin


Supply Wells (from VCWPD, 2018)*by Bottom Perforation Depth (ft bgs)

Perforation Depths Unknown1 - 200201 - 400401 - 600601 - 800801 - 920

Note:*Only active wells shown, monitoring and cathodic protection wells excluded.


July 2018

Figure

3

Ventura County, CA

VENTURA RIVER WATERSHED MODELING

Cross-Section A-A'

Santa Barbara

0 2 4 6 8 10 12 14 16 18 201 3 5 7 9 11 13 15 17 19

-200

0

200

400

600

800

1,000

1,200

1,400

1,600

1,800

-100

100

300

500

700

900

1,100

1,300

1,500

1,700

-200

0

200

400

600

800

1,000

1,200

1,400

1,600

1,800

-100

100

300

500

700

900

1,100

1,300

1,500

1,700

Distance Along Pro�le (miles)

Elev

atio

n (fe

et a

bove

mea

n se

a le

vel)

40x

vert

ical

exa

gger

atio

nA'A

02N

23W

05K0

1S

03N

23W

32Q

09S

03N

23W

32Q

04S

03N

23W

33N

02S

03N

23W

33E0

2S

03N

23W

28L0

1S

FP T

H-1

03N

23W

08B1

3S03

N23

W08

C02S

03N

23W

05L0

1SCS

TH

-2CS

TH

-304

N23

W32

Q01

S

04N

23W

32C0

2S

04N

23W

29L0

1S

04N

23W

29G

04S

04N

23W

29B0

4S

04N

23W

20R0

1S

DH

-3D

H-2 DH

-1 AG

I Sei

smic

Sur

vey

Loca

tion

#1A

GI S

eism

ic S

urve

y Lo

catio

n #2

04N

23W

09B0

1S

04N

23W

04H

01S

05N

23W

33R0

1S

05N

23W

33B0

5S

05N

23W

28P0

1S 05N

23W

20R0

6S

05N

23W

21M

05S

05N

23W

21N

05S 05

N23

W16

P01S

B-B'

C-C'

E-E'

F-F'

Lower Ventura River Upper Ventura River

San

Ant

onio

Cre

ek c

on�u

ence

Paci

�c O

cean

Fost

er P

ark

Subm

erge

d D

am4

DRAFT SUBJECT TO CHANGEJ:\

Proj

ects

\DB1

7.11

59.0

0 Ve

ntur

a Ri

ver W

ater

shed

Mod

elin

g\G

IS\G

raph

er\S

ectio

n-A

.pdf

(140

ft.)

(980

ft.)

(970

ft.)

(630

ft.)

(280

ft.)

(760

ft.)

(300

ft.)

(190

ft.)

(60

ft.)

(210

ft.)

(170

ft.)

(120

ft.)

(160

ft.)

(370

ft.)

(310

ft.) (80

ft.) (5

20 ft

.)

(570

ft.)

(70

ft.)

(40

ft.)

(540

ft.)

(830

ft.)

(980

ft.)

(107

0 ft

.) (930

ft.)

(590

ft.) (9

0 ft

.)

(100

ft.)

(450

ft.)

(990

ft.) (490

ft.)

(480

ft.)

Area of fault gouge in alluvium

T061

1109

253

MW

-14

(360

ft.)

03N

23W

16Q

01S(

1440

ft.)

Qsb

Tp

Qsb

Tmy-

-Tr

-Tv

Ts

Tv-Tr

TmyTmy-

TrTmy(?)

Tv-

Ts

Qp(?)

Qp(?)

Tcw

Tcd

Tma

Tj

Qh

Qh

Tr

Ts

Qh Undi�erentiated alluvium (Holocene)

Qp Undi�erentiated alluvium (Pleistocene)

Qsb Santa Barbara Formation (Pleistocene)

Tp Pico Formation undivided (Pliocene)

Tmy Montery Formation undivided (middle and late Miocene)

Tr Ricon Shale (Miocene)

Tv Vaqueros Sandstone (early Miocene)

Ts Sespe Formation (Oligocene)

Tcw Coldwater Sandstone (late Eocene)

Tcd Cozy Dell Shale (late Eocene)

Tma Matilija Sandstone (middle to late Eocene)

Geologic contact (? where uncertain)

Anticline or Syncline

Fault (? where uncertain), dotted where concealed

C-C'Cross-section location

Groundwater well 3

Bottom of well

Notes:1. Displaying bottom of alluvium elevations for areas with approximate alluvium thickness of at least 10 feet2. Depth-to-bedrock based on well-log interpretation where available,

and otherwise on Turner (1971)3. State Well Number or well designation and approximate distance

from cross-section4. Foster Park Submerged Dam has a 300-ft gap on eastern end

(SBRA, 2002)

Explanation

Tj Juncal Formation (early to middle Eocene)

6. Frugro, 2002

Bulletin-118 Groundwater Basins

8

7. HGC, 2007 8. Gurrola, 2018; Rockwell et al., 1984

5. AGI, 2014; depths indicate depth of seismic survey

9. Cathodic protection well10. Monitoring well (GeoTracker)

Vent

ura

Ant

iclin

e

Sync

line

Unn

amed

Fau

lt

Red

Mou

ntai

n A

ntic

line

?

Oak

Vie

w F

aults

Dev

il’s

Gul

ch F

ault

La V

ista

Fau

lt

Unn

amed

Fau

lts

Villa

nova

Fau

lt

Arr

oyo

Parid

a Fa

ult

Unn

amed

Fau

lt

Unn

amed

Ant

iclin

e

? ?

?

??

?

?

?

6

6

6

5 5

7

7 7

9

9

10

Section parallels Ventura River and North Fork Matilija Creek


Elev

atio

n (fe

et a

bove

mea

n se

a le

vel)

30x

vert

ical

exa

gger

atio

nB'B

0 2 4 6 8 101 3 5 7 9 11

0

200

400

600

800

1,000

1,200

1,400

100

300

500

700

900

1,100

1,300

1,500

0

200

400

600

800

1,000

1,200

1,400

100

300

500

700

900

1,100

1,300

1,500

04N

23W

18C0

2S

04N

23W

07R0

2S

04N

23W

17D

01S

04N

23W

17C0

2S

04N

23W

08R0

3S04

N23

W08

R02S

04N

23W

16C0

8S

04N

23W

16A

03S

04N

23W

16A

01S 04

N23

W10

G02

S

04N

23W

01J0

2S

04N

22W

07C0

5S

04N

22W

06K1

3S

04N

22W

05M

06S

04N

22W

05N

01S

04N

22W

05J0

5S

04N

22W

04P0

5S

A-A'

C-C'

D-D'

Upper Ventura River Ojai Valley

San

Ant

onio

Cre

ek

Vent

ura

Rive

r

Semi-con�ning unit


Proj

ects

\DB1

7.11

59.0

0 Ve

ntur

a Ri

ver W

ater

shed

Mod

elin

g\G

IS\G

raph

er\S

ectio

n-B.

pdf

(980

ft.)

(1,4

60 ft

.)

(1,4

80 ft

.)

(160

ft.)

(250

ft.)

(390

ft.)

(60

ft.)

(1,4

50 ft

.) (1,3

60 ft

.)

(1,5

50 ft

.)

(670

ft.)

(1,0

30 ft

.)

(1,6

80 ft

.)

(690

ft.) (5

20 ft

.)

(440

ft.)

(390

ft.)










Groundwater well 3

Bottom of well

Notes:1. Displaying bottom of alluvium elevations for areas with approximate

alluvium thickness of at least 10 feet2. Depth-to-bedrock based on well-log interpretation where available,


from cross-section4. Within Ojai Valley, data used to delineate cross-section obtained from geophysical logs created during construction of the wells, see

Explanation

DBS&A (2011)

Ts

Ts

Tv

Tr

Tr

Tv

Ts

Tmy

Qp

Qp

Qp

QhQh

Qh

Qh

?

?

?



July 2018

Figure

4

Ventura County, CA


Cross-Section B-B’

Santa Barbara

5

5. DBS&A (2011)

5

Unn

amed

Fau

lt


Elev

atio

n (fe

et a

bove

mea

n se

a le

vel)

30x

vert

ical

exa

gger

atio

nC'C

0 2 4 6 8 101 3 5 7 9

0

200

400

600

800

1,000

1,200

100

300

500

700

900

1,100

1,300

0

200

400

600

800

1,000

1,200

100

300

500

700

900

1,100

1,300

04N

23W

32Q

01S

04N

23W

32K0

3S

04N

23W

32J0

6S

04N

23W

22P0

4S 04N

23W

14M

04S 04

N23

W12

P01S 04

N22

W07

C05S

04N

22W

6K13

S04

N22

W06

K05S

04N

22W

06H

03S

04N

22W

06J0

7S

04N

22W

05C0

4S

05N

22W

32P0

2S05

N22

W32

Q01

S

A-A'

B-B'

D-D'

F-F'

Upper Ventura River Ojai Valley

Lion

Can

yon

Cree

k co

n�ue

nce

V

entu

ra R

iver

con

�uen

ce

Thac

her C

reek

con

�uen

ce


Proj

ects

\DB1

7.11

59.0

0 Ve

ntur

a Ri

ver W

ater

shed

Mod

elin

g\G

IS\G

raph

er\S

ectio

n-C.

pdf

(180

ft.)

(770

ft.)

(270

ft.)

(50

ft.)

(20

ft.)

(110

ft.)

(1,3

10 ft

.)

(470

ft.)

(100

ft.)

(540

ft.)

(630

ft.)

(470

ft.)

(310

ft.) (8

40 ft

.)

Qh

Qh

Tmy

Tmy

Tr

Tr

Tv

-Tv

Qp

Qp

Ts

Tcw

Tcd

TmyTmy

Tr

Tr

Tr

Ts

Ts

Qh

Sulp

hur M

ount

ain

Faul

t (?)

?

Oak

Vie

w F

aults

(?)

Unn

amed

Fau

lt

Dev

il’s G

ulch

Fau

lt

Unn

amed

Fau

lt

?

La V

ista

Fau

lt

Vill

anov

a Fa

ult (

?)

?

Sant

a A

na F

aultA

ntic

line












Groundwater well 3

Bottom of well




from cross-section4. Within Ojai Valley data used to delineate cross-section obtained from

geophysical logs created during construction of the wells, see

Explanation

DBS&A (2011)



5

5. DBS&A (2011)


July 2018

Figure

5

Ventura County, CA


Cross-Section C-C'

Santa Barbara


Section parallels San Antonio Creek


Elev

atio

n (fe

et a

bove

mea

n se

a le

vel)

10x

vert

ical

exa

gger

atio

nD'D

0 2 4 61 3 5

0

200

400

600

800

1,000

1,200

1,400

1,600

1,800

2,000

2,200

2,400

2,600

2,800

3,000

0

200

400

600

800

1,000

1,200

1,400

1,600

1,800

2,000

2,200

2,400

2,600

2,800

3,000

04N

22W

09P0

2S

04N

22W

04P0

5S04

N22

W05

R07S

04N

22W

04N

02S

04N

22W

05J0

5S

04N

22W

05H

04S

04N

22W

04D

02S

05N

22W

32Q

01S

04N

22W

20Q

02S

04N

22W

20Q

01S

04N

22W

20K0

2S

05N

22W

28M

01S

04N

22W

08Q

01S

04N

22W

08J0

2S

B-B'

C-C'F-F'

Ojai ValleyUpper Ojai Valley

San

Ant

onio

Cre

ek

Thac

her C

reek


Proj

ects

\DB1

7.11

59.0

0 Ve

ntur

a Ri

ver W

ater

shed

Mod

elin

g\G

IS\G

raph

er\S

ectio

n-D

.pdf

(2,4

20 ft

.)(7

00 ft

.)

(310

ft.) (1

30 ft

.)

(1,2

80 ft

.)

(80

ft.)

(1,9

90 ft

.)

(1,5

50 ft

.)

(400

ft.)

(230

ft.)

(300

ft.)

(860

ft.)

(1,4

40 ft

.) (760

ft.)

Lion

Can

yon

Cree

kTmy

Tr

Tv

Ts

TsTs

Tv

Tr

Tr(?)

Tv(?)

Ts

Tcw

Tcd

-Tma

Qp

Qh

Qh

-Qh

Lion

Fau

lt

Sant

a A

na F

ault

Ant

iclin

e











Fault (? where uncertain)


Groundwater well 3

Bottom of well

Notes:1. Displaying bottom of alluvium elevations for areas with approximate alluvium thickness of at least 10 feet2. Depth-to-bedrock based on well-log interpretation where available, and otherwise on Turner (1971)3. State Well Number or well designation and approximate distance from cross-section4. Within Ojai Valley data used to delineate cross-section obtained from geophysical logs created during construction of the wells, see

Explanation

DBS&A (2011)



Tma Matilija Sandstone (middle to late Eocene)


July 2018

Figure

6

Ventura County, CA


Cross-Section D-D'

Santa Barbara

5

5. DBS&A (2011)


Elev

atio

n (fe

et a

bove

mea

n se

a le

vel)

10x

vert

ical

exa

gger

atio

nE'E

0 1 2 30.5 1.5 2.5

-200

0

200

400

600

800

1,000

1,200

-300

-100

100

300

500

700

900

1,100

-200

0

200

400

600

800

1,000

1,200

-300

-100

100

300

500

700

900

1,100

02N

23W

05C0

1S

03N

23W

32Q

09S

03N

23W

32Q

10S

03N

23W

33N

02S

T061

1100

940

B-10

A-A'

Lower Ventura River

Vent

ura

Rive

r


Proj

ects

\DB1

7.11

59.0

0 Ve

ntur

a Ri

ver W

ater

shed

Mod

elin

g\G

IS\G

raph

er\S

ectio

n-E.

pdf

(410

ft.)

(280

ft.)

(320

ft.)

(1,9

10 ft

.)

(460

ft.)

03N

23W

31N

01S

(100

0 ft

.)



Qsb Santa Barbara Formation (Pleistocene)

Qlp Las Posas Formation (Pleistocene)

Qs Saugus Formation (Pleistocene)



Groundwater well 3

Bottom of well

Notes:1. Displaying bottom of alluvium elevations for areas with approximate alluvium thickness of at least 10 feet2. Depth-to-bedrock based on well-log interpretation where available, and otherwise on Turner (1971)3. State Well Number or well designation and approximate distance from cross-section

Explanation


July 2018

Figure

7

Ventura County, CA


Cross-Section E-E'

Santa Barbara


4. Cathodic protection well5. Shell Oil Company Well with geophysical log data dated August 1948 (well is now destroyed)6. Borehole (GeoTracker)

44

6

5

Qsb

Qsb

Qlp

Qlp

Qlp

Qs

Qs

Qs

Qp

-Qp

Qh

Qh

Qh

-Qp

Qp-


Elev

atio

n (fe

et a

bove

mea

n se

a le

vel)

40x

vert

ical

exa

gger

atio

nF'F

0 2 4 6 8 10 12 141 3 5 7 9 11 13

200

400

600

800

1,000

1,200

1,400

1,600

300

500

700

900

1,100

1,300

1,500

1,700

200

400

600

800

1,000

1,200

1,400

1,600

300

500

700

900

1,100

1,300

1,500

1,700

04N

23W

29F0

2S04

N23

W29

G04

S04

N23

W29

B04S

04N

23W

29H

06S

04N

23W

22P0

2S

04N

22W

17G

02S

04N

22W

17G

01S

04N

22W

09P0

2S04

N22

W09

Q03

S

04N

22W

16A

01S

04N

22W

16A

03S

04N

22W

10N

01S

04N

22W

10P0

1S04

N22

W10

Q02

S04

N22

W10

R03S

04N

22W

11N

02S

04N

22W

11P0

6S 04N

22W

12M

01S

04N

22W

15C0

1S

A-A'

Upper Ventura River Upper Ojai Valley

San

Ant

onio

Cre

ek

Vent

ura

Rive

r

Lake

Cas

itas


Proj

ects

\DB1

7.11

59.0

0 Ve

ntur

a Ri

ver W

ater

shed

Mod

elin

g\G

IS\G

raph

er\S

ectio

n-F.

pdf (2

10 ft

.)

(650

ft.)

(1,5

30 ft

.)

(860

ft.)

(250

ft.)

(110

ft.)

(110

ft.)

(1,0

00 ft

.)

(480

ft.)

(20

ft.)

(190

ft.)

(190

ft.)

(1,3

60 ft

.)(2

00 ft

.)(6

30 ft

.)

(70

ft.)

(210

ft.)

(390

ft.)

(490

ft.)

(120

ft.)

D-D'

04N

23W

22P0

4S(1

620

ft.)

04N

22W

11Q

03S

(580

ft.)










Groundwater well 3

Bottom of well




from cross-section4. Current Lake elevation (June 2018) is approximately 489 ft.

Explanation

4



July 2018

Figure

8

Ventura County, CA


Cross-Section F-F'

Santa Barbara

Qh

Qp(?)

TrTmy

Tr

Tr(?)

-Tv

Ts

Ts

Tv-

Tr

Tmy

Qp

Qp

Qp

Qp

Qh-

Qh

Qh

Devil’s G

ulch Fault

Oak View

Faults

Lion

Fau

lt (?

)

?

?

04N

22W

12P0

4S

C-C'

Section parallels Lion Canyon Creek from 5 to 10.5 miles along section

LOWER VENTURA RIVER

UPPERVENTURA RIVER

OJAI VALLEY

UPPEROJAI VALLEY

Pacific Ocean

A

E

E’

F’

F

B

C’

D’

D

A’

B’

C

Geophysical surveycross-section(Fugro, 2002)

Geophysical surveycross-section

(AGI, 2014)

05N32W20R06S05N23W21M05S

05N23W21N05S

05N23W16P01S

04N22W20Q02S04N22W20Q01S

04N22W20K02S

05N22W28M01S

04N22W08Q01S

04N22W08J02S

03N23W32Q04S

03N23W32Q09S

03N23W32Q10S

03N23W33N02S

04N23W08R02S

04N23W16A03S

04N23W29B04S04N23W29G04S

04N22W15D01S04N22W16A01S

04N22W16A03S

04N22W06K05S

04N22W06J07S04N22W05M06S

04N22W05N01S

04N22W04D02S

04N22W04N02S04N22W05J05S

04N22W09Q03S

04N22W10N01S04N22W10P01S

04N22W11N02S04N22W11P06S

04N22W12P04S

02N23W05C01S

02N23W05K01S

03N23W28L01S

03N23W33E02S

03N23W05L01S

03N23W08B13S03N23W08C02S

04N23W04H01S

04N23W08R03S

04N23W09B01S

04N23W10G02S

04N23W14M04S

04N23W20R01S

04N23W22P04S

04N23W22P02S

04N23W29F02S04N23W29H06S

04N23W29L01S04N23W32C02S

04N23W32J06S04N23W32K03S

04N23W32Q01S

05N23W28P01S

05N23W33B05S

05N23W33R01S

04N23W07R02S04N23W16A01S

04N23W16C08S04N23W17C02S

04N23W17D01S

04N23W18C02S

04N22W09P02S

04N22W10Q02S

04N22W15C01S

CS TH-2 CS TH-3

FP TH-1

DH-1

DH-2DH-3

04N22W07C05S

04N22W06K13S

04N22W06H03S

04N22W05C04S

04N22W05H04S

04N22W04P05S04N22W05R07S

05N22W32Q01S

04N23W01J02S

05N22W32P02S

04N23W12P01S

T0611100940 B-10

04N22W12M01S

04N22W17G01S

04N22W17G02S

03N23W31N01S

T0611109253 MW-14

04N22W11Q03S

03N23W16Q01S

K:\P

roje

cts\

Wat

er R

esou

rce

Serv

ices

\Pub

lic\D

B17.

1159

.00

Vent

ura

Riv

er W

ater

shed

Mod

elin

g\G

IS\M

XD

s\C

ross

-Sec

tions

_Mem

o\Fi

g09_

Wel

ls_U

sed_

in_L

ithol

ogic

_Ana

lysi

s.m

xd T

CB

2018

0815

Well Locations Used inGeologic Analysis

Figure

9Santa Barbara

0 31.5 Miles

Ventura County, CA


Legend

Fugro, 2002Geophysical logs used byDBS&A (2011)GeotrackerHGC, 2007VCWPD/SWRCBVCWPDVRWD

Data Source: Gutierrez et al., 2008

Well with lithology data(symbolized by data source)

August 2018

Geophysical logDriller or geologic logWell projected onto cross-sectionCross sectionVentura River watershedBulletin 118 (2016 InterimUpdate) groundwater basin

Note:See Figure 10b for Geology Legend.

Pacific Ocean

Foster Park Submerged Dam

Arroyo Parida Fault

Oak View Faults

VillanovaFault

Santa Ana Fault

Cuyama Quadrangle, see Figure 11MAT ILIJA CREEK

VE

NTU

RA

RIV

ER

SAN AN

TONI O

CREE K

LION CA NYON C REEK

CAÑADA LAR G

A

CREEK

Red Mountain Antic line

Ventura Anticline

Oxnardsyncline

K:\P

roje

cts\

Wat

er R

esou

rce

Serv

ices

\Pub

lic\D

B17.

1159

.00

Vent

ura

Riv

er W

ater

shed

Mod

elin

g\G

IS\M

XDs\

Cro

ss-S

ectio

ns_M

emo\

Fig1

0a_G

eolo

gic_

Map

_SB

.mxd

TC

B 2

0180

713

Figure

Santa Barbara

0 31.5 Miles

July 2018

Ventura County, CA


Cross section

Ventura River watershedBulletin 118 (2016 Interim Update)groundwater basin


K:\P

roje

cts\

Wat

er R

esou

rce

Serv

ices

\Pub

lic\D

B17.

1159

.00

Vent

ura

Riv

er W

ater

shed

Mod

elin

g\G

IS\M

XDs\

Cro

ss-S

ectio

ns_M

emo\

Fig1

0b_G

eolo

gy_l

egen

d_SB

.mxd

TC

B 2

0180

713


Figure

Santa Barbara

July 2018

Ventura County, CA


Santa Ana Fa

ult

Santa Barbara East Quadrangle, see Figure 10

K:\P

roje

cts\

Wat

er R

esou

rce

Serv

ices

\Pub

lic\D

B17.

1159

.00

Vent

ura

Riv

er W

ater

shed

Mod

elin

g\G

IS\M

XDs\

Cro

ss-S

ectio

ns_M

emo\

Fig1

1a_G

eolo

gic_

Map

_Cuy

ama.

mxd

TC

B 2

0180

713

Figure

Santa Barbara

0 31.5 Miles

July 2018

Ventura County, CA


Data Source: Kellogg et al., 2008

Cross section

Ventura River watershedBulletin 118 (2016 Interim Update)groundwater basin

K:\P

roje

cts\

Wat

er R

esou

rce

Serv

ices

\Pub

lic\D

B17.

1159

.00

Vent

ura

Riv

er W

ater

shed

Mod

elin

g\G

IS\M

XDs\

Cro

ss-S

ectio

ns_M

emo\

Fig1

1b_G

eolo

gy_l

egen

d_C

uyam

a.m

xd T

CB

2018

0713

Data Source: Kellogg et al., 2008

Figure

Santa Barbara

July 2018

Ventura County, CA


Holocene

Pleistocene

Pliocene

Miocene

Oligocene

Eocene

Paleocene

QUATERNARY

TERTIARY

CRETACEOUS

JURASSIC

TRIASSIC

UPPERVENTURA

RIVER

C

B

A

F

K:\P

roje

cts\

Wat

er R

esou

rce

Serv

ices

\Pub

lic\D

B17.

1159

.00

Vent

ura

Riv

er W

ater

shed

Mod

elin

g\G

IS\M

XDs\

Cro

ss-S

ectio

ns_M

emo\

Fig1

2_Te

cton

ic_P

hysi

ogra

phic

_Map

.mxd

TC

B 2

0180

713

Tectonic and Physiographic Map,Ventura River Watershed Area within

White Ledge Peak and Matilija Quadrangles

Figure

12Santa Barbara

0 1.50.75 Miles

July 2018

Ventura County, CA


LegendVentura River watershedBulletin 118 (2016 Interim Update)groundwater basinCross section

Data Source: Minor and Brandt, 2015

LOWER VENTURA RIVER

UPPERVENTURA RIVER

OJAI VALLEY

UPPEROJAI VALLEY

Pacific Ocean A

E

E’

F’

F

B

C’

D’

D

A’

B’

C

900600

400700500

300

1100800

300

0

1400

200

1000

900

600500400

19001600

1800

1500

700

200

1200

900

1000

500

600

400

200100

1000

800

300

200

200

600

500

400

1100

700

1300

1200

800

800

400

500

500

800

600

300

300

14001300

1200

1200

1000

700

400

600

400

300400

200

K:\P

roje

cts\

Wat

er R

esou

rce

Serv

ices

\Pub

lic\D

B17.

1159

.00

Vent

ura

Riv

er W

ater

shed

Mod

elin

g\G

IS\M

XDs\

Cro

ss-S

ectio

ns_M

emo\

Fig1

3_Bo

ttom

_of_

Allu

vium

.mxd

TC

B 2

0180

713

Elevation of Alluvium Bottom

Figure

13Santa Barbara

0 31.5 Miles

Ventura County, CA


LegendBottom of alluvium contours, elevation(ft msl)

Cross section

Ventura River watershed

Bulletin 118 (2016 Interim Update)groundwater basin

Assumed areas of saturated alluvium* July 2018


Notes:*Excludes thin alluvium underlying ephemeral creeks in mountainblocks, and Lake Casitas area.

See Figure 10b for Geology Legend.

LOWER VENTURA RIVER

UPPERVENTURA RIVER

OJAI VALLEY

UPPEROJAI VALLEY

Pacific Ocean A

E

E’

F’

F

B

C’

D’

D

A’

B’

C

K:\P

roje

cts\

Wat

er R

esou

rce

Serv

ices

\Pub

lic\D

B17.

1159

.00

Vent

ura

Riv

er W

ater

shed

Mod

elin

g\G

IS\M

XDs\

Cro

ss-S

ectio

ns_M

emo\

Fig1

4_Al

luvi

um_t

hick

ness

.mxd

TC

B 2

0180

713

Alluvium Thickness

Figure

14Santa Barbara

0 31.5 Miles

Ventura County, CA


July 2018

LegendCross section

Ventura River watershed

Bulletin 118 (2016 InterimUpdate) groundwater basin

Assumed areas of saturatedalluvium*

Note:*Excludes thin alluvium underlying ephemeral creeks in mountainblocks, and Lake Casitas area.

Alluvium thickness (feet)

51 - 100101 - 150151 - 200201 - 250251 - 300301 - 350351 - 400

401 - 450451 - 500501 - 550551 - 600601 - 650651 - 700701 - 750

10 - 50

Documents

MEMORANDUM · FROM: Stephen J. Cullen, PG, PhD Gregory Schnaar, PhD ... and orientation of the Arroyo Parida Fault zone based on fault investigations and engineering