HomeMy WebLinkAboutCT 73-29; Carrillo Ranch; Feasibility Study; 1979-08-21W.O. 109-SD August 21, 197a
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CARRILLO RANCH
Landslide and Development Feasibility
Study, Parcels b, c, e, f, h-3, i-2, j.
City of Carlsbad, California.
For
Daon Corporation
GeoSoils, Inc.
r-
1446 East Chestnut Avenue * Santa Ana, California 92701 * (714) 547-6703
August 17, 1979
W.O. 109-SD
Daon Corporation
4041 MacArthur Boulevard Building "A"- 3rd. Floor
Newport Beach, California 92660
Attention: Mr. Mike Ryan
Subject : Landslide and Development Feasibility Study,
Parcels b, c, e, f, h-3, i-2, and j, Carrillo Ranch area, City of Carlsbad, California.
Reference: (1) "Report of PrePreliminary Geotechnical
Eastern and Southern Parcels Carlsbad, Investigation Carrillo Ranch Project
Associates, Inc., Dated January 10, 1979 (S.E.A.)
California", By Shepardson Engineering
(2) "Limited Landslide Investigation, Carrillo Ranch Project, Carlsbad, California." BY Shepardson Engineering Associates, (S.E.A.)
Inc., Dated January 26, 1979.
- Gentlemen:
" The following report presents the results of our landslide investigation
- City of Carlsbad, California. Seven Parcels comprise the total
on the subject properties, located within the Carrillo Ranch area
study area and total approximately 435 2 acres.
-
The primary purpose of this investigation was to verify the extent
of landsliding on the subject property and to collect geotechnical
parameters needed for landslide analysis and stabilization Concepts.
In addition, this study was intended to develop initial Soils
-
- engineering and geological factors as related to site development
planning.
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W.O. 109-SD
August 17, 1979
SCOPE OF SERVICES
Information contained within this report is the summation of
the following:
1. Review of previous reports (see Appendix).
2. Analysis of aerial photographs.
3. Surficial mapping.
4. Boring and Trench exploration, to provide subsurface
5. Landslide analysis.
geologic information.
Exploratory borings were excavated in order to obtain information
concerning geometry, strength parameters and depth of sliding.
Exploratory trenches were also excavated to further define limits
of sliding, geologic contacts and the nature of subsurface materials
underlying the study area.
Included within this report is a geologic map (Plate I) and structure
Sections, Plate I1 & I11 which illustrate the approximate aerial distribution of
geologic units, surficial deposits, landslides and the locations
of exploratory trenches and borings. The base topographic map was
provided by Rick Engineering and was drawn to a scale of one inch
equals 200 hundred feet, utilizing a contour interval of five feet.
The cross sections are drawn to a scale of one inch equals 100 feet.
FIELD EXPLORATION
Subsurface exploration of the site was performed in two phases
begining in June, 1979 and ending in July, 1979. Initially, four
borings were drilled to verify the presence of landslides and to
define their depth. Eventually this study resulted in the excavation
of 20 borings ranging in depth from eight to 81 feet. Additional
data was obtained by excavating 24 backhoe pits to depths of up to
14 feet. The approximate locations of the borings and backhoe
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August 17, 1979 W.O. 109-SD
trenches are shown on the Geologic Map, Plate I and the logs are
presented in Appendix A.
Drilling of the borings and excavation of pits were supervised
by our staff geologist. The borings were drilled with bucket type
drilling rig. Periodic "Undistrubed" split-spoon type samples and
bulk samples of the materials encountered in the borings were
obtained.
Previous exploration by Shepardson Engineering Associates, Inc. was
reviewed. For convience, their seven boring logs and 27 trench logs
are included at the end of this report as Appendix B. The approximate
locations of these explorations are shown on Plate I.
DESCRIPTION OF STUDY AREA
The study area consists of approximately 435f acres located south
of Palomar Airport Road and east of El Camino Real. The site occurs
in the easterly portion of the City of Carlsbad and is a portion
of the Carrillo Ranch. A site location map is presented herein
as Figure I.
The site occurs primarily along the north flank of a prominent
southwest trending ridge and faces a major canyon which drains
westerly. Two large canyons and other smaller gullies have incised
into the ridae flank and drain north and northwest into the major
canyon. A portion of the study area extends across the canyon and
borders Palomar Airport Road.
Natural slopes vary from approximately 6:l (horizontal to vertical)
to nearly 2:l. Locally more gentle slopes occur along the larger
tributary canyons with steeper slopes along the smaller gullies.
Maximum relief over the site ranges from approximately 550 feet
at the southeastern boundary to approximately 175 feet near the
western boundary. While most of the area has been previously
cultivated or disced, at present, a thick growth of grasses and tall
GeoSoiIs, Inc.
SITE LOCATION MAP
I Soil Mechanics Geology Foundation Engineering
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Page 4
August 17, 1979
W.O. 109-SD
weeds cover the lower slopes. Scrub oak occur on many of the higher
slopes in the southern portions of the property.
Structures and improvements within the study area include the
historic Carrillo Ranch site, a dam and reservior, main trunk
sewer line and several unimproved roads. A paved road extends
from Palomar Airport Road to the Ranch facilities.
The ranch site is situated in the major canyon, within the central
portion of the study area. This historic site is owned and maintained
by the City of Carlsbad. The dam and reservior lies several hundred
feet northeast of the ranch, see Plate I. The trunk sewer line
parallels the north bank of the creek within the major canyon.
Fill possibly associated with the installation of the trunk sewer
line exists near the northwest boundary. This fill deposit was previously
reported and estimated to be approximately 10 feet thick and moderately
compacted. In addition, fill was also used to construct the
dam within the major canyon. The fill materials appear to be
locally derived, consisting of a mixture of sands and clays.
Topsoil
Topsoils on the site consist primarily of dark brown silty clays.
Generally, these soils vary from 2 to 4 feet thick. Conglomerates
underlying the study area have produced a topsoil mantle consisting
primarily of cobbles and boulders with a clayey matrix. Thick
topsoil type accumulations also occur along the back of landslides,
as graben infillings.
The topsoils currently vary from dry to moist. These materials
may be used as compacted fill, although they are regarded as
highly expansive in nature. The topsoils are low in density and
should be removed from all excavations and fill areas.
GeoSoils, Inc.
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Alluvial Deposits (Map symbol-Qal)
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August 17, 1979
W.O. 109-SD
Alluvial deposits represent accumulations of soils within the
main and tributary canyons. These deposits have been washed from
the surrounding slopes and therefore are composed of local materials
(mostly cohesive), which are poorly consolidated. In addition,it
should be anticipated that some colluvium will exist along smaller
canyons, gullies and side slopes beyond those deposits mapped as
alluvium. Within the small canyons, these deposits may vary from
5 to 10 feet thick; in the area of the larger tributary canyon
southeast of the ranch facilities, the alluvium is expected to range
from 15 to 25 feet in depth; and in the major canyon the alluvium
may extend from 25 to 35 feet deep.
In general, alluvium and colluvium should be removed from areas to
receive fill or used for structural support. The major canyon
alluvium is wet and soft and settlement would be anticipated if
loaded. All these materials may be reused for compacted fill and
they are regarded as expansive.
Approximately the southern two thirds of the site is underlain by
claystones and sandstones of the Del Mar Formation. Sandstones
(Tds) occur mainly along the upper slopes while interbedded claystone
and sandstone (Tdc-s) occur along the mid-slope areas. The
claystones and sandstones also extend along the eastern and northern
portions of the study area.
Sandstones are generally dense and often contain a clayey matrix
Claystones are typically hard, but susceptible to landsliding.
Claystones and clayey sandstone would be regarded as expansive.
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W.O. 109-SD
August 17, 1979
Light to moderate ripping may be expected within the Del Mar
Formation, although occassional cemented layers may be encountered
which would require difficult ripping. Blasting is not anticipated.
Lusardi Formation (map symbol - K1)
The Lusardi Formation represents a thick conglomerate or accumu-
lation of cobble to boulder size rock fragments. This formation
underlies the Del Mar Formation and is also exposed in the eastern
and northern portions of the study area. The conglomerate may
contain up to 10 percent of materials in excess of eight inches.
The maximum size of the boulders appears to be approximately 3 to
4 feet. Special handling may be necessary to properly place the
oversized rock in compacted fill areas. Heavy ripping difficulty
is anticipated.
The conglomerate contains a clayey sandstone to sandy mudstone
matrix which appears to be expansive.
Grantic Rock (Kgr)
Granodiorites, reprensenting a portion of the Southern California
Batholith, occur locally along the eastern edge of the study area.
Generally, the granodiorite locally weatheres to sitly, medium to
coarse grained sand, interspersed with the massive boulders.
Excavation within the granodiorites would create a rock disposal
problem and blasting may be necessary to achieve final grades or
slopes. Steep cut and fill slopes may be formed with these materials.
The soils are not regarded as expansive due to their granular nature.
Santiago Peak Volcanics (Jsp)
Limited exposures of meta volcanics occur near the southwestern
boundary of the study area. The volcanics are of an andesite
composition and are very hard and highly fractured.
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August 17, 1979
W.O. 109-SD
Difficult ripping and possible blasting should be expected within
the volcanics. Resulting soils would be rocky and non-expansive,
GEOLOGIC STRUCTURE
The main structure of the area appears to be characterized by
a broad, northwest to west trending syncline. The sedimentary
strata of the Del Mar Formation tend to be gradational, lenticular
and interfingering. While surface ourcrops are sparse, subsurface
information, in general, indicates bedding to be gently to moderately
dipping toward the north and northwest. Studies of adjacent parcels,
to the northwest, reveal bedding to be moderately dipping to the
southwest.
GROUNDWATER
Subsurface exploration in the alluvial areas of the major canyon,
revealed that groundwater exists at depths of five to 30 feet below
existing ground. In most cases, an artesian condition existed
causing the water to rise to at or near the surface. The water
depths encountered and depths to which the water rose are indicated
on the geologic map. It is expected that water levels will fluctuate,
due to seasonal and the existing reserv0i.r may be supplying much of
the water conditions.
Water seepage was also encountered in several borings. These perched
conditions have developed due to permeability contrasts between the
interlayered soil types and/or as fractured zones within the
landslides. Much of the recently observed seepage may exist from
winter rainfall, but would be expected to continue under landscape
irrigation. For the most part, perched water was contained within
sand beds overlying a more cohesive strata and within the landslide
fracture zones.
CeoSoils, Inc.
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W.O. 109-SD
August 17, 1979
LANDSLIDES
Extensive landsliding is evident within the south-central portion
of the study area. Landslides mainly occur along the north facing
slope and side slopes within the larger canyon.
The approximate locations of these features based on field mapping,
aerial photographs and subsurface exploration are shown on the
Geologic Map (Plate I). Structure sections A-A' through 1-1'
(Plates I1 and 111) have been drawn through the major landslides
to illustrate their surficial relationships, and subsurface geometry
as defined by our exploratory boring and trench pits.
Landslides within the study area can be categorized as composite-
failure slides with gently dipping basal slide planes or as partially
rotational features with arcuate slide surfaces.
The main slide area underlying the north facing slope occurs not
as one large single mass, but as a complex assemblage of super-
imposed slide masses.(see structure sections E-E', F-F', G-GI.1
These probably occurred as regressive landslides, in which continual
headward sliding takes place after an initial failure near the
canyon bottom, creates an unstable situation upslope. In many
instances subsequent sliding resulted in overriding of the lower
slides.
Exploratory borings in this area verified slide planes to range from
20 2 to 70f feet in depth. Structure sections E-E' and G-G' indicate
the toe of the basal slide to extend into the creek of the major
canyon and to be partially buried by more recent alluvium.
Landslides underlying the side slopes of the larger canyon display
similiar characteristics and are illustrated by sections C-C',
D-D'. H-H'. and 1-1'.
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August 17, 1979
W.O. 109-SD
The landsliding has consistantly occurred within the clayey portions
of the Del Mar Formation. Slide planes observed in borings are
generally soft clay with well developed polished and striated
surfaces. Typically, the overlying slide mass is intensely
disturbed with shears, fractures, weathered and moist zones and
punky to friable zones. In contrast, the underlying bedrock is hard.
The cause of landsliding is probably related to a combination of
factors including adverse bedding conditions resulting from the
regional synclinal structure and excessive moisture conditions as
occurred during the Pleistocene era. Deterioration and softening
of the clay materials, seepage forces, oversteepening of canyon
sidewalls and possible seismic events may have also combined to
affect instability. Subsequently, infilling of graben areas and
erosion have partially modified the surficial appearance of the
slides.
LANDSLIDE STABILIZATION
Stabilization of the landslides may be accomplished by a combination
of several methods. These include: Burial, removal and the use
of shear keys and/or buttresses. A brief desciption of these
procedures are provided below.
Burial
Landslides which are situated within enclosed canyon areas may
be adequately stabilized by filling the canyon. The amount of
filling must be specifically desiqned for each slide area by the
ensineer .
Removal
This includes either complete removal of the landslide or
partial removal of the landslide to render the remainder stable.
Partial removal is best accomplished in combination with one
of the methods below.
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W.O. 109-SD
Page 10
August 17, 1979
Shear Key
A shear is similar to a buttress, except that removal involves
excavating into the landslide mass such that a deep trench
is created. The trench or shear key penetrates the slide
plane and subsequent filling with compacted fill resists
movement. The resisting width of the shear key is designed
by the engineer.
Buttress
A butress or earthfill retaining wall may be used to prevent
future movement. This method calls for the removal of the
lower portion of the landslide and constructing a compacted
fill slope with a key section specifically designed to resist
slide movement.
Landslides along the large canyon side slopes can best be
stabilized by placing fill within the canyon. The fill would
act as a buttress, partially burying the landslides. At structure
sections B-B' and C-C' preliminary analysis indicate a fill depth
of 55 feet from the base of the canyon will be needed to effectively
resist the slide forces.
The landslide illustrated in structure section 1-1' would require
a shear key of approximately a 100 feet in width within the lower
portion of the slide to achieve stabilization.
Sections E-E', F-F' and G-G' illustrate the landslide underlying
the north facing slope. Slides in this area are complex with slides
superimposed upon one another. Preliminary analysis indicate
stabilization of the basal slide mass in this area will require
approximately 40 feet of fill and a buttress key on the order of
150 feet in width that would extend across the entire toe of slope
for approximately 900 feet and blending into the large canyon fill.
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August 17, 1979
W.O. 109-SD
The approximate location of the shear keys and buttresses are
illustrated on Plate la and cross sections, Plates 2a and 3a.
These designs are preliminary and would vary with the grading
configuration. It should be noted that cutting material away
from the head of the slide would tend to increase stability.
Additional buttressing and/or removal of other superimposed
landslides should be anticipated. The extent of this can only be
designed when the approximate grades are determined. Surficial
removals of graben deposits and highly disturbed bedrock will
have to be determined in the field.
Because of the nature of the slide masses and the generaly north
dipping bedding, most cut slopes may require stabilization.
Additional subsurface exploration should be performed after a
final grading plan has been adopted in order to provide the most
effective stabilization design for each area affected.
OTHER ENGINEERING CONSIDERATIONS
Based on our investigation, the subject property may be safely
developed. As a guide to planning, we have provided the soils
engineering parameters which would tend to affect earthwork and
development. These quantities are based on our laboratory testing
of the site materials, and experience with similar materials.
Site Preparation
Dense vegetation, should be removed and wasted from the site.
Topsoil, colluvium, surficial alluvium and unsuitable fill deposits
should be removed prior to fill placement. Deep alluvium within
the major canyon may need to be removed prior to fill placement.
All the materials may be reused as compacted fill. Large boulders
should be wasted from the site; or broken up into usable size
materials; or buried in deep fill using special rock disposal methods
CeoSoils, Inc.
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Compacted Fill
Page 12
August 17, 1979
W.O. 109-SD
The site materials available for compacted fill include all the
bedrock materials, alluvial, colluvial and fill deposits. These
materials are expected to produce compacted fill with adequate
strength to support residential structures and moderate slope
heights.
Slide materials may have a high moisture content and some difficulty
in compaction may be encountered.
Slopes
Cut and fill slopes may be graded in most of the formati on
to moderate heights and gradients up to 2:l (horizontal to
s al material
vertical).
The clayey portion of Del Mar Formation would be the weakest material
and some height limitation may be necessary depending upon future
engineering calculations. Portions of the sandstones may be
slightly susceptible to erosion. It should be anticipated that a
majority of all cut slopes will probably require stabilization.
Excavation Characteristics
The bedrock materials, in general, may be excavated with conventional
earthmoving equipment using light to moderate ripping. Some
difficult ripping may be expected in occasional cemented layers,
and within the granites and volcanics. The Lusardi Conglomerate
would tend to be difficult to excavate due to the dense rock
accumulation.
Earthwork Balance
The following preliminary bulk and shrinkage factors may be
estimated for planning purposes:
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W.O. 109-SD
August 17, 1979
Topsoil and Fill - 15-20% shrinkage
Alluvium and Colluvium- 10-20% shrinkage
Landslide Debris - 5 -10% shrinkage
Del Mar Formation - 2% shrinkage - 2% bulking
Lusardi Conglomerate - 0-2% bulking
Expansive Soils
The site materials vary from sands to clays with expansive
characteristics varying from non-expansive to highly expansive,
and in some cases critically expansive. Since much of the materials
tend to be interbedded, the soil mixture resulting will vary in
the mid to high expansive range. It may be possible to selectively
grade the sandstone unit to reduce the foundation reinforcement
requirements on many pads.
Sulfate Content
Analysis of the soils can be used to select the proper type of
concrete to avoid concrete deterioration. The bedrock materials
are considered to contain a low to moderate content of soluble
sulfates. Testing at completion of pad grades should be performed
to determine the concrete requirement, although preliminary testing
of the general soil types may estimate this condition.
Subdrains
Subdrains should be considered for all canyons receiving fill and
for all stabilization construction. These would be intended to
collect rising groundwater, or to relieve accumulations of water
from landscape irrigation sources. Subdrains should be constructed
with perforated pipe embedded in a filter material. Groundwater
presently exists in the lower alluvium.
GeoSoils, Inc.
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W.O. 109-SD
August 17, 1979
We sincerely appreciate this opportunity to be of service, and
we will continue to provide you with consultation and pertinent
parameters as they are developed. If you have any questions
regarding the information in this report or other geotechnical
aspects of the project, please call.
Respectfully submitted,
GeoSoils, Inc.,
By:
Geologist
Reviewed By : Albert R.
JAS/TCW/gn Civil Engineer
Encl: Geologic Map - Plate I
Structure Sections - Plate I1 & I11
Preliminary Stabilization Map - Plate la
Stabilization Structure Sections - Plate IIa & IIIa
Appendix - A- Boring and Trench Logs (GSI)
B- Previous Boring and Trench Logs (SEA)
GeoSofls, Inc.
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Daon Corporation
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W.O. 109-SD
APPENDIX A
Trench Logs - Plate TP-1 to PT-24
Logs of Borings - Plate B la to B 20
CeoSoils. Inc.
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G 0 TEST PIT LOG 1
DATE 6-14-79
LOGGED BY JAS/TCW
ELEVATION
w.0. 109-SD
CLIENT Daon
i- lG 0
TEST PIT LOG 2
w. 0.
CLIENT DAON
PRCJECT
109-SD
Carrillo Ranch
IG 0 I TEST PIT LOG 3
DATE 6-14-79
LOGGED BY TCW
ELEVATION
w.0, 109-SD
CLIENT DAoN
PROJECT Carrillo Ranch
G 0 TEST PIT LOG 4
\
DATE 6-15-79
LOGGED BY TCW
ELEVATION
1
w.0. 109-SD
CLIENT DAON
G 0 TEST PIT LOG
4
DATE 6-15-79
LOGGED BY TCW
ELEVATION
w. 0. 109-SD
CLIENT DAON
PROJ~~T Carrillo Ranch
DATE 6-25-79
LOGGED BY
ELEVATION
TCW
w.0. 109-SD
CLIENT DAON
*
G 0 TEST PIT LOG 7
DATE 6-25-79
LOGGED BY TCW
ELEVATION
w.0. 109-SD
CLIENT DAON
PRCJECT Carrillo Ranch
G 0 TEST PIT LOG 8
<
DATE 6-25-79
LOGGED BY TCW
ELEVATION
G 0 TEST PIT LOG 9
\
DATE 6-25-79
LOGGED BY TCW
ELEVATION
w. 0.
CLIENT Daon
PROJECT Carrillo Ranch
109-SD
DATE
LOGGED BY TCW
ELEVATION
" W.O. 109 - sn
CLIENT DAON
PROJECT Carrillo Ranch
k
G 0 TEST PIT LOG 11
DATE
LOGGED BY TCW
ELEVATION
" w. 0. 109-SD
CLIENT DAON
PRCJECT CARRILLO RANCH
,-
.-
.-
G 0 TEST PIT LOG 12
DATE 6-27-79
LOGGED BY-
ELEVATION
w. 0. 109-SD
CLIENTRAON
G 0 TEST PIT LOG 13
\
DATE
LOGGED BY XW
ELEVATION
6-28-79
-
v) H ! 0
U
w. 0. 109-SD
CLIENT ma
PROJECT Carrillo Ranch
DATE 6-28-79
LOGGED BY-
ELEVATION
w. 0. 109-SD
CLIENT-
PRGJECT Carrillo Ranch
*
G 0 TEST PIT LOG 15
DATE 6-28-79
LOGGED BY
ELEVATION
Tcw
Lo Fi
0 1
U
DATE 6-29-79
LOGGED BY-
ELEVATION
I-
I
G 0 TEST PIT LOG 17
\
DATE 6-28-79
LOGGED BY
ELEVATION
!rcw
t
W.O. 109-SD
CLIENT DAm
I-
.- G 0 TEST PIT LOG 18
4
DATE 6-28-79
LOGGED BY
ELEVATION
w.0. 109-SD
CLIENT DAON
PROJECT Carrillo Ranch
r- I
!
DATE 6-28-79
LOGGED BY TCW
ELEVATION
W.O. 109-SD
CLIENT Daon
PROJECTCarrio Ranch
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I .. b
G 0 TEST PIT LOG 20
!
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i
DATE 6-28-79
LOGGED BY
ELEVATION
TCW
w. 0. 109-.SD
CLIENTAn
PRGJECT Carrillo Ranch
1-
I- G 0 TEST PIT LOG 21
* *
DATE 6-28-79
LOGGED BY
ELEVATION
TCW
w. 0. 109-SD
CLIENT
PRCJECT Carrillo Ranch
DAON
G 0 TEST PIT LOG 22 I
DATE 6-28-79
LOGGED BY-
ELEVATION
4
w. 0. 109-SD
CLIENT-RAON
PRCJECT Carrillo Ranch
G 0 TEST PIT LOG 23 I
DATE 6-28-79
LOGGED BYTCW
ELEVATION
W.O. 109-SD
CLIENT DAON
PROJECT Carrillo Ranch
*
G 0 TEST PIT LOG 24
DATE 6-28-79
LOGGED BY
ELEVATION
TCW
w.0. 109-SD
CLIENT DAON
PROJECT Carrillo Ranch
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BORING LOG 1
CLIENT DAON W.O.*SD DATE DRILLED6/13 - 14/7 9 LOGGED BYJAS/TCW
PROJECT Carrill0 Ranch SURFACE ELEV. 350 DRIVING WT.
TOPSOIL: SILTY CLAY, dark brown
to black, moist, grades to
SILTY SANDI to CLAYEY SAND,
orange to buff, moist, soft. F t -
mottled, burrowed, damp to - moist SILTY CLAY and topsoil -
with shards of light colored
material =GRABEN.
steep streaked topsoil 4 E-W
50N. underneath] PUNKY BEDROCK, orange, light gray to white, -
root bearing, mottled burrowed,
damp to moist.
CLAYEY FINE SAND, light gray
to white fairly friable, local -
iron cemented zones otherwise -
non-discripted.
- - -
- -
/ / t
CLAYSTONE, medium gray, orange
disturbed, FOSSIL DEBRI, 6-8
and yellow staining, highly
FOSSILIFEROUS MUDSTONE on Only - inches thick well cemented
the North side of hole. -
Dipping 60° S.E. other part
steep shear with orange streaks -
of FOSSIL. layer offset 2 ft.
N60E, 35 SE on S-side. orange and yellow banding /
CLAYEY SILT, light gray, moist
soft.
2-3 ft. shear zone,&g;y,- $!g ~
- - -
- - - - - -
G 0 BORING LOG 1
4 slide zone highly sheared,
well developed, polished -
surfaces, moist, plastic CLAY
on shear zone extending to
-
-
CLAYEY SILTSTONE, Light gray, -
material grading into FINE SAND and CLAYSTONE, hard, -
greenish gray.
-
- -
CLAYSTONE, green, damp, hard, -
occasional shears.
SITLSTONE and SILTY SANDSTONE -
dark to medium gray, damp,
hard.
CLAYEY SILTSTONE, dark bluish
gray, hard, iron staining
damp to dry, occasional shears. -
-
-
/ -
-
0 BORING LOG 2 I
"0 - TOPSOIL: SILTY CLAY, dark brown -
damp to moist, soft to firm. -
Burrows, CLAY and CLAYEY SAND - - - to weathered CLAYSTONE. -
CLAYSTONE, orange banding, moist
to very moist, soft.
highly fractured.
above, soil type loose, below
- - -
surfaces with orange banding.
Tension crack trending E-W 90 -
infilled with SAND is cutting
off FOSSIL bed.
-
-
N75W 8-10 N. SAND and FOSSIL -
ayer on N-side of hole. - - the NW joint may be different.
Infilling on joint (E-W) so
light, SILTY CLAY, no color - -
F
0 BORING LOG 2 I c 1
CLIENT- DAON W.O.*SD
ELEV. 365 DRIVING WT. PROJECT Carrill0 Ranch SURFACE D4TE DRILLED6113 - 1412 9 LOGGED BY=S/TCW
J 0
(3
E
?19.5'oxidation streak trending E-WI -
35N1 present all around the -
hole. A few parallel surfaces
similiar to bedding. - -
!21' FINE SAND layer underlain by
CLAYSTONE with orange banding. -
N80W, 10N.
bedding in SAND layer trends - -
!4'INTERMEDIATE SLIDE PLANE: moist,
plastic clay, polished,soft,
-
N70E. 12N. Parallel surfaces -
125'
126'
above in CLAYSTONE above. join
trending E-W, 80N below shear
zone. 1 foot weathered zone then cemented SILTSTONE. under that is light gray CLAYEY
SILT. cemented layer parallel to shear surface so must be
parallel to bedding.
polished surfaces, well
developed, parallel with bedding above.
to 37.5 feet. light gray fine SAND continues
,27.5 SILTY CLAY/CLAYEY SILT
8.5 CLAYSTONE, upper surface marked
bv oxidation, BEDDING is thin E with local moist zones/N55El
10-llN.
BORING LOG 2
CLlENTDAnN. W.0,- DATE DRILLED 6113-14/79 LOGGED BYJAS/TCW
PROJECTCarrillO Ranch SURFACE ELEV. 365 DRIVING WT. -
Id :: I
430 am I u I/ CLAYSTONE to fine SANDSTONE. c 1 I /./ S-side cemented of SAND hole laver, exposes somewhat a t
of layer at 32 feet, N85E,12N fractured, trend-taken on top
~ ft. series of fractures PJ40W,
well developed parallel surface just below. material above
SILTY CLAYSTONE, below is red- t CLAY becomming hard
orange iron stained, polished
surface N70W, 40S, well devel-
oped with a few parallel
plastic than above.
surfaces below. more moist &
iron staining becomming brighte
and more true orange, CLAYSTONE darker gray.
series of steeply dipping orang
fractures in all directions.
0 BORING LOG 2
- 0 BORING LOG L
~ i
CLIENT DAON W.O. mD DATE DRILLED6/13-14/79 LOGGED BY=/Tm
PROJECT!~~Z~~~O &Xi& SURFACE ELEV. 310 DRIVING WT.
-
TOPSOIL; SILTY CLAY, dark brown, -
damp to moist, soft to firm.
weathered fine SANDSTONE CLAYEY, -
orange brown, moist, firm. -
Sandy, SILTY FINE SANDSTONE, -
light orangish to white, moist - loose, CALICHE bearing.
CHALK, CALICHE deposit at base - of SAND. below is crumbly
CLAYSTONE contact N40W, 5-6NE.
CLAYSTONE is medium to light -
gray damp, stiff.
GYPSUM, and illregular slick - surfaces. -
harder, orange sheared surface representing beginning of
intense fracturing. CLAYSTONE becoming more disturbed. -
polished, striated surfaces
\ -
-
-
-
-
-
Lineations on striae generally -
plunge to the north.
harder, gray CLAYSTONE series of -
fractures N60E, 90, N60W, 21~
-
\ =shear surface. SLIDE PLANE: N30W20N, shear zone I representinu 3 to 4 surfaces. I CLAY lined,-soft.
CLAYSTONE fractured in all Shear surface, N65W, 55N
directions.
0 BORING LOG I
CLIENT DAON W.O.lmD DATE DRILLED 6/1 3-14/79 LOGGED BY- JAS/TCW
~~
PROJECT- SURFACE ELEV. 310 DRIVING WT.
\ CLAYSTONE and SANDY CLAY/CLAYEY
SAND, buff to light gray, dry
to damp, hard.
-CLAYSTONE, hard, slightly damp I-
occasional random fractures,
irregular slicks.
CLAYSTONE continues, hard, random
fractures, massive E
' TOPSOIL: then back into mottled -
dry,san@ CLAY,loose,layers of
SAND, medium dense.
mixture of weathered CLAYSTONE
and topsoil (weathered CLAYSTONE)
moist plastic CLAY layer and
SLICK SURFACE poorly defined but -
plasticity is countineous around - hole. gently dipping westerly. -
Interbedded CLAYS & SANDS, contac'i
poorly defined between 7 and 11 -
feet. just above gray brown
gray CLAYSTONE with lot of
SANDY CLAY and overlying light
CALICHE are two parallel SLIDE
PLANES 6-8 inches apart. slight1)-
steeper dip than CHARCOAL,AN6OE, -
- - - -
- -
-
CHARCOAL bearing, SANDY CLAY
layer. charcoal just above SANDY
CLAY layer. surface undulatory
CHARCOAL streaks N45E, 5NW
and essentially flat 1ying.Other -
attitude of possible SLIDE PLANE. -
with CLYST. Above and below, 6 inch concentration of CHARCOAL -
streaked and smeared zone in
upper part of zone. (sampled -
-
-
-
minor local caliche, CLAY - continuing to this depth. CLAY -
contains small amounts of SAND
and PEBBLES, moist, stiff.
grading to fine SANDY CLAY, to
medium GRAIN SAND to verv COARSE
- - - I ~~
SAND, 18 inches thick. a few
PEBBLES caught up in SLIDE PLANE. PEBBLES k to k inches.
..
BORING LOG I
@2l 1' contact, SAND over CLAY, SLICK
SURFACE along contact NSOE,
10-12N. CLAY is very moist,
contact and slick have same trend, failure across CLAY unit, well
developed surface with CLAY disturbed for 4 to 5 inches below i
it. t I At 20% feet. very plastic zone
23t Materials moist, stiff to very
stiff CLAY, change from ROCK
below to more soil like
materials above. (contact
between competent BEDROCK &
CRUDY ROCK & SOIL)
@ 3-5 fracture pattern / N70W to N40W,
65-90N. high concentration of
RED IRON staining. 2nd joint set
N75E, 85NW., well developed. I
@ 24' moderately well defined polished
surface. slightly obscured by fracture pattern/ N55E, 35SE.
polished surface steepens into
the fractures on the N.W. side
of hole.
-5' gray CLAYSTONE, hard, damp, red
streaks, irregular joints ROCK
below is dense.
@26'BEDDING, poorly developed A N65E, 11N.W.k N65W, 70 NE Disturbed zone just above BEDDING
attitude.
medium grain, SILTY SAND, dense,
damp, qrayish to light brown. coniacf abrupt between SILTY
SANDS and CLAYSTONE, BEDDING
nearly flat lying/ N70# I
2-4N.W. I+[/ 6 inch layer of well cemented t / SANDSTONE- -
“40.. CLAYSTONE contact with granule size fragment. concentration^ at
representing channel cuts with
GRAVEL. COARSE SAND and GRAVEL
overlye CLAYSTONE.
reddish brown CLAY, iron stained
joint N70E, 40-50SE. Joint
locally well developed to obscure a 2nd joint set N70W,
50NE. CLAYSTONE and FINE
SANDSTONE interbeds, 6 inches
thick.
- - base. contact irregular -
- - - --
very thin well developed plane
slightly more moist and iron stained.
A N55W, 25NE, CLAY seam or Joint?
slickensided CLAYS, highly
disturbed. en echelon surfaces,
low angles/ N25W, 55SW.
some planes higher angle, some
Well developed SLIDE PLANE
N55W, 35NE. orange stained,
CLAYSTONE below is harder, several parallel surfaces over
4 inch distance. gray fine
0 BORING LOG 4 I
CLIENT DAON W.O.lmD DATE DRILLED 6/13 - 14/7 9 LOGGED BYJAS/TCW
PROJECT Carrill0 RanchsURFACE ELEV. 270 DRIVING WT.
~~
0 BORING LOG- I
I L
SANDY CLAY, black (TOPSOIL) -
ALLUVIUM: CLAYEY SAND, medium to -3 dark brown, very moist, very -
soft. -
'CLAYEY SAND, dark brown, very -S(
moist, soft. - - ' CLAYEY SAND, light brown, very -S(
moist, soft. - -
SAND, light brown, wet, loose SI -
-
-I 5 - -
I
SAND, medium brown, moist, loose.
'Caving at 18 feet due to 4 I groundwater. 2 sal. /hour. t flow approximately
I-
Total depth 18 feet
Unable to penetrate deeper
Groundwater at 18 feet. t
C. 0 BORING LOG 6 I
CLIENT DAoN W.O.wD - DATE DRILLED 6-27-79 . LOGGED BY- GD , TCW
' PROJECT Carrill0 R~~C~SURFACE ELEV. 245 DRIVING WT. 2500
TOPSOIL:,SANDY CLAY, brown to black, -C] moist, hard, porous with rootlets -
and caliche.
SANDY CLAY, medium brown, very moist,
very stiff, with rock fragments.
,c 1 -
-
c1 SANDY CLAY, green moist, hard
SANDY CLAYSTONE (WEATHERED BEDROCK),- - -
green, moist, hard, with caliche.
\ -
CLAYSTONE, green, moist, hard,
iron staining. -
CLAYSTONE, gray - green, moist,
hard, iron staining, polished -
fractures & evidence of shearing. -
' CLAYSTONE, gray, moist, hard, -
fractured and polished. P
\
~
SHEAR ZONE withhighly disturbed
Claystone (Slide Plane?)
L
/Sandy CLAYSTONE, gray to green,
moist, hard. t- r
CLAYSTONE, gray, moist, hard. F t
I
0 BORING LOG I L I
. PROJECT~~~~~~~O Ranch SURFACE ELEV. 245 DRIVING WT.
CLIENT DAoN -~.0.109-~~ DATE DRILLED- . LOGGED ~y2 GD TCCi
'CLAYSTONE, gray to green, water-
seepage along fractures, occasional
well developed striae along shear
planes.
L - CLAYSTONE, gray, wet, hard.
TOTAL DEPTH 44 feet.
/ - - - -
NOTE: Hole was left open overnight-
with intention of down hole logging-
6-28-79. Hole was completely
at ?am. 6/28. Seepage initially
filled with water upon returning
encountered at30 feet.
- - - - - - -
- - -
c-
.
0 BORING LOG I
~ ~
CLIENT DAON W.O. 109-SD DATE DRILLED 6-27-79 ' LOGGED BYGD,TCW
PROJECT Carrillo Ranch SURFACE ELEV. 230 DRIVING WT. 250°
~~ ~~~
2 m
t
v)
a
0 3
[L 0
4-01 I I
tj 'I TOPSOIL:,SANDY CLAY, medium brown,
moist, hard, with roots and caliche
--/ALLUVIUM: CLAYEY SAND, gray to green,
moist, hard.
SANDY CLAY, gray to green, moist,
very stiff.
-
"5 -
)CLAYEY SAND, mudstone fragments
/SANDY CLAY, gray to brown, moist, -
very stiff.
I SAND increasing m CLAYEY SAND, medium brown, moist, tS( - dense, coarse sand & mudstone fragments, becoming harder.
14% ft., large cobbles (2-6 inch)
-15 \ SAND AND ROCK - \CLAYEY FINE SAND, gray to brown,
very moist. -
"20 - 24 CLAYEY SAND, medium brown, moist,
dense, sand coarse to fine grain.
- CLqYEY SAND WITH ROCK, wet, medium
dense, no recoverable sample. - Becoming very wet.
"BEDROCK: CLAYSTONE, greenish gray, - fractured, iron stained.
t L
0 BORING LOG I
.CLIENT DAoN w. 0. __ 109-SD DATE DRILLED 6-27-79 . LOG6 D BYSTCW
PROJECT Carrillo Ranch SURFACE ELEV. 230 DRIVING WT. 2506
\ CLAYSTONE, grayish green, moist,
hard.
SANDY CLAYSTONE, gray to medium
brown, moist, hard.
SANDSTONE, gray to green, moist,
matrix.
dense, mediumgrain, with Clayey
SANDY CLAYSTONE, greenish gray, \ moist, hard. F TOTAL DEPTH 40 feet.
Water seepage at 25-27 feet.
No Caving.
BORING LOG I
I I
I
TOPSOIL:.SANDY CLAY, dark brown, CE
dry, hard, porous with roots.
ALLUVIUM: SANDY CLAY, dark brown, dry CE
hard, porous with roots and caliche
SANDY CLAY, medium brown,. moist,
very stiff.
- - - -
CI
'CLAYEY SILT, gray, moist, very -
stiff, minor amounts of caliche - -
/SAND, medium grain, gray, moist, SP
loose. -
-
/4-6 inch cobbles -
SAND, medium to coarse, gray, moist.SP -
'BEDROCK: SANDY CLAYSTONE, green,
slightly moist, hard.
SANDY CLAYSTONE, light green, damp,
hard. t
TOTAL DEPTH 20 feet
No Groundwater encounterefi
No Caving 'E
BORING LOG I
Fa wo WJ LL -2 =I I
WI- a I-P a aw a 30 w
" 0 "
m I >
v)
a 3 0 12: a
SANDY CLAYSTONE, gray-green, moist, - iron stained, polished, caliche. - -
CLAYSTONE, greenish gray, moist,
hard, minor polished surfaces. t
"5 - CLAYSTONE, light gray, damp, hard, soapy, highly sheared with smooth slick surfaces. F
Slide Plane: Oxidized, undulatory NlOW, 30SW, striated surface
"-10" CLAYSTONE, gray, damp, hard.
N60W, 70NE, Orange oxidation on /Two main joint planes, other is
surface.
CLAYSTONE, gray & mottled, orange
E, red, damp, hard.
Zone of red oxidation,Claystone
less fractured.
-
-45" -
H I ' SANDY CLAYSTONE, gray, slightly t - damp, hard. - / CLAYSTONE, gray, damp, hard, some "20" polished surfaces.
HIGHLY SHEARED CLAYSTONE, Striated,
iron stained oranqe, shear N20W I ZONE. c
SANDY CLAYSTONE, damp, hard red
iron staining. - -25
- Red iron staining increases and
-
increasing in sand matrix.
-
-30-
- >
v)
I-
W' z
D > IT D
-
-
10:
10f
109
L22
129
L20
0 BORING LOG I - I
CLIENT DAoN W.0.109-SD DATE DRILLED 6-28-79 ' LOGGED BY2 GD TCN
PROJECT Carrill0 Ranch SURFACE ELEV. 355 DRIVING WT. 2500 lbs-
I I H I hard.
CLAYSTONE, gray, slightly moist, t U I/ t- / HIGHLY SHEARED CLAYSTONE ZONE, -
complex & undulatory striated
surfaces, very moist.
CLAYSTONE, gray, damp,. hard,
slightly oxidized orange.
CLAYSTONE, gray, some red staining,
damp, hard, some polished surfaces.
CLAYSTONE, medium gray, wet & hard, -
joint, surface wet and striated.
-
-
-
L
N55E, 60SE. -
just above Claystone contact.
HI
r.
CLAYSTONE, blue-gray , damp, very
hard. (contrast hardness), less
fractured. t t:
60 I I
0 BORING LOG 9 I
CLIENT DAON W.O. mD DATE DRILLED 6-28-79 LOGGED BY- GD ;TCW
' PROJECT Carrill0 R~~C~URFACE ELEV. 355 DRIVING WT.
SANDY CLAYSTONE, gray, red staining
damp, hard.
t
/ CLAYSTONE, blue-gray, damp,
hard. t I- -
/TOTAL DEPTH 13 feet. .
c
Water seepage at 48 feet.
Basal slide plane at 54 feet.
BO8ING LOG ,x- I 4
CLIENT
PROJECT
DAON , W.O.aSD DATE DRILLED 7-12-79 LOGGED BY- TCW
SURFACE ELEV. .-. 290 DRIVING WT. l8o0 Ibs- Carrillo Ranch
TOPSOIL: SILTY CLAY, dark brown,
moist, very stiff.' t
CLAYSTONE, light gray with some '-
red. staining, dry to damp, hard, soapy, fractured. -
SILTY CLAYSTONE, light gray with
.red staining, damp, hard and *
fractured. -
.Joint Attitudes, NlOE, 90 - E-W, 40s
/ SILTY CLAYSTONE, medium gray and
orange stained, damp, very hard. - .)
/SANDY CLAYSTONE, light gray, red
L
stained, damp, very hard, contact .
between overlying claystone and
sandstone, beneath sandstone is
moist, dense and coarse grain. -
Bedding Attitude, N20W, 18NE -
Back into Claystone -
-Red stained polished fractures ' -
I
L
Moisture increases, Claystone I
very moist.
Joint Attitude, N-S, 50W.
CLAYEY SANDSTONE, light gray to -
white with orange staining, damp, very dense.
-
1
~
- .
..
/
L
Water seepage in Sand layer. - -
CLAYEY SANDSTONE, light orange to -
/yellow, damp, coarse grain.
I
r
0 BO8ING LOG.10, I 1
CLIENT
PROJECT Carrillo Ranch SURFACE ELEV. --- DRIVING WT. l8Oo Ibs-
DAON 109-SD 7-12-79 TCH W.0.- DATE D94bLED- LOGGED BY-
SANDSTONE, orangish-gray, very wet,
coarse grain. -
9
I CLAYSTONE, light gray and mottled
'with orange, punky I
" -
SANDY CLAYSTONE, lightgray, damp, very hard.
to 45 feet, Water seepage
highly disturbed zone, polished
. 'SLIDE PLANE: CLAYSTONE, dark gray,
-
* surfaces, shear zone extends down
-.
-
SANDY CLAYSTONE, light gray, to brown, damp, hard. . -
I
/ ' SILTY CLAYSTONE, dark blue-gray,
damp, hard.
' TOTAL DEPTH, 60 ft. Water seepage at 28 E, 43 ft. No Caving. t
IG 0
BORING LOG 11 I
I
~ ~~
TOPSOIL: SILTY TO SANDY
brown,.dry to damp, dessicated. .~ / SANDY SILTSTONE, mottled orange
and gray, damp to moist, very
stiff. Orange banding 1 to 2 inches thick with gypsum crystals, sub-
.horizontal, undulatory. Also thin yellow stained fractures
trending in all directions.
/Back into CLAYSTONE, sand layer above -
is approximately 2 feet thick. claystone -
shm joints with polished surfaces and" .
orange staining.
SILTY CLAYSTONE, mottled orange to -
gray, damp to moist, stiff to hard,.
Wavy joint paterns with orange gypsum crystals.
staining & crystal growth. -
Joints trending in all directions - prominent joint N25E, 50SE, surface
1s stained and polished.
\Bedding Atti-tude N60 to 80E, 5NW. -
-
-
-
CLAYEY SILTSTONE, light gray,
moist, very hard.
Joint Attitude, N80W, 90.
Joint Attitude, N85E, 82SE
N75E, 50SE Zone of numerous polished joints,
f CLAYSTONE, less hard, becoming L sandy. .
damp, very hard.
CLAYEY SANDSTONE, light gray and
mottled orange, moist, dense.
Becoming more sandy with a -
gradational contact.
' SANDY SILTSTONE, medium gray, - - -
.
L
BO8ING LOG 11 I L, 4
CLIENT DAON , W.O.aSD DATE DRILLED 7-12-79
390 LW&DlE2.- TCW
PROJECT Carrill0 Ranch SURFACE ELEV. .-, DRIVING WT. .
t
' SANDY CLAYSTONE ABOVE AND SAND-
STONE BELOW, Sandstone is medium
to coarse grain, gray with orange streaking. Contact is marked by
3 inch thick orange oxidation zone.
.Bedding is Horizontal.
Another Contact, white clean mediu to coarse grain sandsto'ne beneath
''I Clayey Sandstone. Contact marked b
N50 to 65E, 5 to 10 SE. White 1/8" orange band. Bedding Attitude
-Sandstone is dry, and Dense. F t L
G 0 BOfiING LOG.&. I
Back in CLAYSTONE, hard, highly -
fractured
Punky at '32 feet.
Then hard again at 33 feet.
. -
'SLIDE PLANE: Many polished and m
striated surfaces in Claystone, -
.striated surfaces dipping steeply
west. Undulating surface that is highly polished with bright red and orange staining trends N60W,
dipping 28SW. -
-
I
SILTY CLAYSTONE, light to medium
gray, damp, very hard.
- - . -
I - -
/SLIDE PLANE: Soft, mottled, PUNKY
CLAY, highly disturbed. approxim-. - ately 12 to 16 inches thick
apparent dip 18-20 west.
-
- - -
SILTY CLAYSTONE, dark gray, damp, -
very hard, unweathered. -
/ No Water Seepage Basal Slide Plane at50 feet TOTAL DEPTH 60 feet
IG C. 0 BORING LOG 12 I
CLIENT DAON , W.O.mSD DA3E DRILLED-7-13-79 LOGGED By" TCW
PROJECT Carrillo Ranch SURFACE ELEV. .- 365 DRIVING WT. 1800 lbs. I
TOPSOIL: SANDY CLAY, dark brown, dry - ' CLAYEY SAND, (SC) , medium orangish . . brown, moist, very stiff to dense.
to damp, hard, dessicated.
I
m - - - .
'CLAYEY SANDSTONE, medium gray, -
mottled orange and red, damp, dense, fine grain. - . ..
I
I
SANDY SILTSTONE, gray with orange
streaks, damp, hard. - 9
- -
I - - - -
'1 Ft. gray Claystone layer. .
.~
I-
moist, hard, highly fractured. SANDY CLAYSTONE, green, damp to -
0 BORING LOG 12 I 4
CLIENT DAON . W.O.-lsD DATE DRILLED 7-13-79 LOGGED BY- TCW
PROJECT- RancPSURFACE ELEV. -365 DRIVING WT. 1800 lbs.
t , ______I
ToPSolL: CLAYEY SAND (SC) mottled t \ white, green gray, red and orangeL wet and punky, graded to -
weathered BEDROCK.
CLAYEY SANDSTONE, olive gray -
moist, medium dense.
! - ~
- - Water seepage - - - Water seepage -
A CLAYEY SANDSTONE, light green to -
gray, moist, dense, coarse grain.
damp, hard.
- - - - - - - -
SANDSTONE, orangish brown, damp -
hard, with ROCK fragments, very -
hard drillinq
TOTAL DEPTH= 25 Ft. -
water seepage at 7 and 9 feet, -
hindering drilling. Slide plane -
not penetrated due to hard
SXNDSTONE @ 25' -
0 BORING LOG 14 I C 1
CLIENT DAoN
PROJECTQrrillO Ranch SURFACE ELEV. 295 DRIVING WT. l8O0 lbs.
W.O.*SD DATE DRILLED 7/16/79 LOGGED BYZW
- Topsoil, CLAY(CL), medium -
reddish brown, very moist stiff. -
- Weathered CLAYSTONE soft. - -
"5 - SANDY CLAYSTONE, medium gray, - - damp, hard. ~
contact between highly fractured -
SANDSTONE below. contact
\CLAYSTONE above and CLAYEY
- indistinct. - - -
/ SANDY CLAYSTONE, medium gray, -
\Joint attitude N55E 45NW,
orange & red stained, damp, hard.
caliche infilled.
-
7 -
- \ polished CLAYSTONE and striated - - surfaces, moist, soft.
"15"' Sandy CLAYSTONE, medium gray, -
moist to very moist, hard,
highly fractured. - -
SLIDE PLANE: highly disturbed CLAYSTONE zone
mottled dark gray with light
gray CLAYSTONE pods and dark brown TOPSOIL. Highly sheared
surfaces, GYPSUM crystals, very
moist, soft. SLIDE PLANE nearly
flay lying o to 3' to west.
\\-slight water seep on SLIDE PLANE.
CLAYEY SANDSTONE and conglomerate
orangish brown, damp, hard, (Lusardi Formation). -
- -
~
- Total Depth 26 feet
slight water seepage at 18 feet
SLIDE PLANE at 18 feet. - -
116,
86. !
LOO.
0 BORING LOG 15 I
Id :: I
"to m I
TOPSOIL: SILTY CIAY, black, danp, stiff
CLAYEY fine grain SANDSTONE, HI light gray to white with orange,
damp, medium dense. t "I U I, Hq contact marked bv 2 inch thick
contact with CLAYSTONE below. t - - red stain layer. attitude on
developed fracture N25W 90.
contact N70W 9-20NE. well
- - -
"-10 CLAYSTONE light gray, damp, hard,- - highly fractured with parallel -
bedding.
yellow stained surfaces, equal -
fracture N60W, 90 -
i -
zone of red staining, very loose
with oDen vertical ioints. & 2
&LAYSTONE, light gray above red -
stained zone. 3 to 4 ft. thick
appears similiar to the zone at - - -
staining, gentle dip 2 to SE. - -
12 feet. flat lying. -
"20- another zone of red oxide
-
contact with light gray CLAYSTONE
above, orange SANDSTONE below.
BEDDING N20W, 5S.W. contact well
SANDSTONE is coarse grain.
- - -
-25-
from 24 to 27 feet SANDSTONE is - - exposed.
dense, dry to damp, fine to
medium grain. - - - - "L " _.-
PROJEC
@29-30' SLIDE PLANE: Layers of TOPSOIL within SANDSTONE
at contact with underlyinq CLAYSTONE. contact dipping west
with hard layer on south side of
irregular. Tension fractures,
hole juxtaposed' against CLAYSTONE
on north side. SAND and TOPSOIL. -
filling into tension fracture.
CLAYSTONE, firm, moist. -
CLAYSTONE, brown with orange '&
red staining, very moist, firm. -
fracture, N75E 33' SE infilled
with CALICHE.
" - -
-
-
-
-
SANDSTONE and Conglomerate, - Lusardi Formation. - -
Total Depth 42 Feet.
NO Water Seepage -
Slide Plane at 30 feet.
-
b - - -
c . -
I:
.-
.-
..
i
0 BORING LOG 16
TOPSOIL, -
CLAY (CL), dark brown, dry stiff. -
CLAYSTONE, light gray and orangist
brown, very moist.
moist, stiff.
CLAYSTONE, orange brown; very
-
weathered SANDSTONE with
caliche veins.
' - - - -
t - \ SANDSTONE. contact marked by red contact with CLAYSTONE above -
and orange staining in the
SANDSTONE. contact well developed.-
light gray, moist, very stiff. -
oxidized zone of red and yellow -
BEDDING N70W 1OSW. CLAYSTONE -
CLAYEY SANDSTONE.
contact, CLAYEY SANDSTONE over
clean SANDSTONE. BEDDING attitude-
-
N30W, 5NE.
STONE. SANDSTONE is stained interbedded SANDSTONE and CLAY-
orange and CLAYSTONE light gray
with red staining, beds are -
3 to 4" thick. moist, dense to
very stiff.
- - -
-
SLIDE PLANE: i zone of Durale, and orange CLAY c I polished- su>faces, highly disturbed, striated, toe of
slide. N60E. low, zone extends I to 20 feet. - - -
CLAYSTONE below is highly jointed
and sheared, joints marked by
orange and red stain trending
in all direcitons. very moist
and very stiff.
CLAYSTONE less stained, and
generally a little harder. GYPSUM filled veins, very moist,
moderately fractured.
highly sheared, light gray
CLAYSTONE NlOW 48 SW. a second shear surface N55E 45NW striation
48, S80W and 45N 40W. i
0 BORING LOG 16 I
L - increasing red staining in -
CLAYSTONE. -
\
contact, gray CLAYSTONE over -
orange CLAYEY SANDSTONE. -
36 feet. interbedded gray -
CLAYSTONE and orange CLAYEY -
SANDSTONE. layers approximately
3 inches thick, hard to dense, \ well developed. -
BEDDING N30E, 8SE. from 34 to
-
SLIDE PLANE: -
approximately 12" to 18" thick, highly sheared, medium gray
polished and striated. N55W,
CLAY, high fractured, soft,
15-20NE. - \ - - -
~~~~
CLAYSTONE, dark gray, moist,
hard, massive. t
Total Depth 50 feet.
Slide Planes at 20 and 40 feet
No Water Seepage. I
L
0 BORING LOG l7
4 -
CLIENT DAON W.O.L!??~~ DATE DRILLED 7/16/79 LOGGED BY- TCW
PROJECTCarrillo Ranch SURFACE ELEV. 530 DRIVING WT. 1800 Ibs-
SANDSTONE, light yellow to
white, fine grain, damp.
- contact with massive SANDSTONE over CLAYEY SANDSTONE which is
fractured, damp, hard, with
caliche veins. BEDDING attitude
~~~~~sl~~~~ 85NE
N-S ,90
N50E, 2ONW
NlOE 30SE N75E 65SE
Contact, SANDSTONE below
t
t \ hard fossil SANDSTONE laver
Total Depth at 10 feet. c
0 BO8ING LOG.18 I I' a
CLIENT
PROJECT Carrillo R
DAON w. 0. 109-SD Ob. 1
a
-
TOPSOIL: SILTY CL\Y, 'black, mist, stiff -
CLAYSTONE, with orange stained
fractures and topsoil. -
P \Contact with underlying sandstone.
1.6-8" well cemented hard layer - layer, well cemented, N70E, 7NW. I
orange Sandstone underlying the
well cemented sandstone layer. Caliche and charcoal present -
along contact. Bedding N40E, 13ONh. \ -
CLAYEY-SANDSTONE, green, damp,
hard, layered with orange banding.
Contact with hard, well cemented .
Sandstone.
TOTAL DEPTH 10 Feet. -
Unable to penetrate deeper
-
I
- c i
t
BOeING LOG 19 I 1
CLIENT DAON W.0.- DATE DRILLED- LOGGED BY- TC W 109-SD 7-17-79 PROLECT Carrill0 ~anch SURFACE ELEV. - 493 DRIVING WT.
thick, Bedding N50W, 1OSW.
CLAYSTONE,;orangish gray, damp,
hard, with fine sand, underlain by 1 foot thidk orange Sandstone
layer, coarse grain.
I Contact with SANDY CLAYSTONE,
qreenish. Joint, N55W. 85NE,Joint
\has red staining on surface. I
SANDSTONE, light brown, dry,loose. 6 Inch thick layer of FOSSILIFEROU
12s5Contact, with SANDSTONE, white, orange'staining at contact, dry
to damp, dense.
@ I 14 1 SANDSTONE, white, is grading into
a Sandy Claystone, light green. t CLAYEY FINE SANDSTONE, green,
damp,dense. t
BOfllNG LOG," I 1 CLIENT DAON . W.0.- DATE DRILLED--, 7-17-79 LOGGED BY- TCW PROJECT Carrill0 R~~C~SURFACE ELEV. .- 493 DRIVING WT.
5
U >
2 - C LL c
Becoming dark gray -
CLAYSTONE, dark greenish-gray, dampr
hard,
Bedding N70W, 5NE. - -
.Red Oxide Zone
Hard Layer
I - -
c
TOTAL DEPTH 28 Fee,t .
No Groundwater. I
. - - - - -
c - - - - - .
L - - - . -
BORING LOG 20
I
CLIENT DAoN w. 0. ___ 109-SD DATE DRI LED 7"17-79 ' TCW
PROJECT Carrillo Ranch SURFACE ELEV. 51k DRIVING WT.
I
TOPSOIL
CLAYEY SANDSTONE, light tan to -
yellowish white, damp, medium,
dense.
Contact, SANDY CLAYSTONE,. green- -
gray, damp to moist, hard, -
Bedding N40E, 12SE.
Joint, N-S, 25E. Orange Staining and caliche on surface. Claysbone is higly fractured. -
/ SANDSTONE/CONGLOMERATE, well . - defined contact, N25W, 10N-E.
SANDSTONE, orange in contact with
gray SANDSTONE, below. Gray sand- -
stone is fine grain, damp, dense, -
clay matrix and finely laminated.
Bedding in Laminations, N80E,19NW.
Contact, CLAYEY SANDSTONE above,
fossil shell layer below composed -
of clayey Sandstone matrix. - Bedding NEOE, 25NW Fossil layer extends down to 16 feet.
1 foot layer of well cemented sand"
stone. -
SANDSTONE, light gray, damp, very -
dense, fine grain with clay matrix,
orange staining on contact above.
Contact, fossil SANDSTONE LAYER,
6 in'ches thick. -
CLAYSTONE, medium. gray, moist, hard-
-
c - \ - -
-
- -
-
Total Depth 40 feet. -
I. No Ground water.
L
Daon Corporation W.O. 109-SD
APPENDIX B
Trench Logs 1 to 27
Logs of Borings 1 to 7
From References:
1) "Prepreliminary Geotechnical Investigation,
Proposed 435 Acre Carrillo Ranch Project,
Palomar Airport Road, San Diego County, California."
By Shepardson Engineering Associates, Inc. Dated
January 10, 1979. Project # 810241, Plates 2
through Plate 5.
2) "Limited Landslide Investigation, Carrillo Ranch
Project, Carlsbad, California", By Shepardson
Engineering Associates Inc., Dated January 26, 1979.
Project # 810241, Plates 3 and 4.
GeoSoils, Inc.
BOTTOM OF TRENCH
I- t
3
b
J
6
7
a
9
IO
II
12
IS
T
ea n
SEE PIAl'E #4 €OR LEGEND
I 1.
0 TREWCH 12
DM
106.5 IJ
T..*rn I.
\I -
SEE
D
97.9
I4
11.1
PIATE
,3 11.
J
6
7
a
9
10
42
11
#4
.M
23.9
LEGENI): D. Natural Dry Density
(kt)
N= Natural Moisture Content (%)
um or wum
I ”
.I
2
3
e
J
7
6
6
10
9
I1
12
I3
18
IJ
16
I7
20
21
23
22
2e
2J
26
2?
la
29
11
IO
12
11
34
16
J
I?
*e
3a
4J
96
e?
*X
e9
Io
9 1.
12
Y3
J@
J5
-5
Greenish gray to orwe, mist. mdlm stlff m stiff, silty clay 1-1 b!ar IDmatim)
Greenish qray with orange, hmid to !et, dense, clayst- (El mr mmtiml
*ring nimr Place Dip 25% Mimr Piane Strike SO% (Very et b Sticky1
1 V
~ ,. . . mjm slide plane dip 13%3W .. .. .
Greenish qray with or- to red ir-ide, “t, stiff, highly plastic clays
Y
.
0
1
2
3
4
5
6
7
8
10
9
11
13
12
14
15
16
11
18
19
20
21
22
14
45
46
48
41
49
50
51
52
53
54
55
56
.
Green qmy C fight bran. hmid. hard. ide vienlets alms pl-s-
Charm1 gray to gray. dry to hid. hard to
very stiff, very swdy mdstap
BHEPARDGON ENOINEE4INO IM
WRING ,ES rE 1-25-79 - 810241 I Plate No. 2
. !- i
L
1'
1
1
I
I
1
2
3
4
6
5
7
B
10
9
11
12
13
15
14
16
17
22
7.3
24
25
26
27
28
29
30
31
32
33
34
35
. 36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
0
Buff. mist. transitiml dim dense. sandstar an-
A-
Gra-. mist. sttff. siltstDm
Crav green. mist. stiff to dim Itiff. ndstm
Brm.nish qray. mist. stiff. silty sandstm (scattered irmide Yxnzretimry veins') ..
.
KLS I" 1-25-79 I Dlatn ?.ln A
TE
Rln?Al