steven f. connelly, c.e.g

November 20, 2014 Project #1409

Degan Homes Inc. 2959 S. Winchester Boulevard, Suite 200A Campbell, CA 95008

Attention: Mr. Mack Mohsen

Subject: ENGINEERING GEOLOGIC INVESTIGATION Proposed Residence APN 701-26-047 20183 Via Santa Teresa Santa Clara County, California

Dear Mr. Mohsen,

At your request, I have prepared this Engineering Geologic Investigation for the proposed residence to be constructed on the property, APN 701-26-047, located at 20183 Via Santa Teresa in Santa Clara County, California. (see Figure 1, Site Location Map). I understand that a new home is proposed, as approximately shown on Figure 8, Site Geologic Map and Figure 9, Geologic Cross-Section A-A’.

The property is located within hillside terrain susceptible to potential landsliding. The County of Santa Clara maps the property within a County Landslide Hazard Zone. The County of Santa Clara consequently has required an Engineering Geologic Investigation to assess potential landslide hazards impacting the project and the proposed home site.

The purpose of this Engineering Geologic Investigation is to identify existing geologic conditions and potential geologic, landslide, or seismic hazards on the subject site, and to provide appropriate recommendations for the proposed new construction.

The scope of this investigation included review of pertinent geologic maps and literature; review of a Soil and Foundation Investigation for the project by American Soil Testing Inc., consultation with Mr. James Baker, the Santa Clara County Geologist; analysis of historical aerial photographs; a site reconnaissance; engineering geologic analysis; drafting; and preparation of this Engineering Geologic Investigation letter report.

STEVEN F. CONNELLY, C.E.G.


Consulting inEngineering Geology


______________________________________________________________________________ 1169 Avenida Benito, San Jose, CA 95131 www.stevenfconnelly.com Phone (408) 392-9999 Cell (408) 398-9339

http://www.stevenfconnelly.com

http://www.stevenfconnelly.com

APN 701-26-047 20183 Via Santa Teresa Santa Clara County, California


Site Conditions

The subject property is an irregular-shaped parcel located within hillside terrain along the southwest flank of the northwest-trending Santa Teresa hills (see Photo 1 below). The property is located at the intersection of Via Santa Teresa and Graystone Lane. The proposed home site is situated at the southeast corner of the property along the nose of a broad southwest-trending ridgeline (see Figure 2, Regional Topographic Map).

A proposed driveway will be excavated into the hillside, providing access from Via Santa Teresa at the southern corner of the property, as shown on Figure 8, Site Geologic Map. A slope profile across the property and proposed home site is shown on Figure 9, Geologic Cross-Section A-A’. The property is vegetated by a few oak trees and grass, as shown on Photo 1 and Photo 2 below.

Photo 1: Recent aerial view of the subject property. Via Santa Teresa bounds the western edge of the site.

STEVEN F. CONNELLY, C.E.G. Page !2

Site



Geology

Regional geologic mapping by McLaughlin and others (2001) indicates that most of the subject property and site vicinity are underlain by Sandstone and Shale of the Great Valley Sequence, as shown on Figure 3, Regional Geologic Map. Mudstone and Sandstone of the Mt. Chual Formation is mapped underlying the northeast edge of the property. An apparently old inactive fault contact is mapped between the Great Valley Sequence and the Mt. Chual Formation rocks. A buried trace of the potentially active Shannon fault is mapped within the alluvial terrain about 1000 feet to the southwest of the property.

The California Geological Survey (2003) identifies landslide deposits and steep hillside terrain in the site vicinity as ground susceptible to potential earthquake-induced landsliding, as shown on Figure 4, State Seismic Hazard Zones Map. The subject property and the proposed home site appear to be located within the State Seismic Hazard Zone due to the steepness of the site terrain.

The California Geological Survey (2006) maps a large landslide deposit to the east of the property, as shown on Figure 5, State Landslide Inventory Map. Landslides, however, have not been mapped on or adjacent to the subject property. Santa Clara County (2004) also maps a large landslide deposit to the east of the property, as shown on Figure 6, County Geologic Hazard Zones Map.

Seismicity

The greater San Francisco Bay Area is recognized by Geologists and Seismologists as one of the most active seismic regions in the United States. Several major fault zones pass through the Bay Area in a northwest direction (see Figure 1) which have produced approximately 12 earthquakes per century strong enough to cause structural damage. The faults causing such earthquakes are part of the San Andreas Fault System, a major rift in the earth's crust that extends for at least 700 miles along western California. The San Andreas Fault System includes the San Andreas, Hayward, Calaveras, Greenville, and San Gregorio Fault Zones.

According to Blake (2000), the San Andreas fault is located 9 miles to the southwest of the subject property. The Calaveras and Hayward faults are located about 10 miles and 16.5 miles to the northeast of the site, respectively. The San Gregorio fault is located about 26 miles to the west and the Greenville fault about 34 miles to the northeast. These faults are considered to be active (Hart and Bryant, 1997), having had surface displacement within Holocene time (the last 11,000 years).




The Shannon fault is mapped about 1000 feet to the southwest of the property. The Shannon fault is part of a northwest-trending belt of faults that lie sub-parallel to the San Andreas fault along the southwest margin of the Santa Clara Valley. The belt of faults is referred to as the Range Front Fault System, which includes the Sargent, Berrocal, Shannon, Blossom Hill, and Monta Vista faults.

The State of California has not zoned the Shannon fault or other range-front faults as potentially active. Geomorphic and seismic data, as well as surficial deformation documented following the 1989 Loma Prieta earthquake, however, suggests that faults within the Range Front Fault System may be currently active. Extensive damage was noted along the Range Front Fault Zone as a result of the Loma Prieta Earthquake by Terratech, Inc. (1990) and Schmidt and others (1995).

The Range Front faults generally accommodate both dip-slip and lateral movement. Based on geologic, geophysical, and seismic data, these faults are considered to be the locus of about 3 to 4 kilometers of uplift and an undetermined amount of lateral slip within the last 5 million years (McLaughlin and others, 1999).

The Range Front faults may be independent seismic hazards or activity may occur as triggered slip in response to large events on the nearby San Andreas fault. Hitchcock and others (1994) suggest that a M6.5 earthquake in 1865 may have been centered on one of the Range Front faults. Kovach and Beroza (1993) indicate that a M7.1 earthquake could potentially be generated by rupture along the length of the Range Front Fault System.

Air Photo Review

The following stereographic pairs of black & white aerial photographs were examined to observe site conditions and to aid in identifying potential geologic hazards:

Date Photo Identification Type Scale 6-12-56 CIV-6R-183 & 184 B&W 1:20,000 5-17-65 SCL 13 206 & 207 B&W 1:12,000

The subject property is visible in the photos reviewed, as shown on Photo 2 below. The property is located in grass-covered hillside terrain. A few mature oak trees are growing on the undeveloped property. Evidence of recent landsliding or faulting, in the form of fresh scarps, ground cracking, or disturbed vegetation, is not apparent on the subject property in the air photos reviewed. Debris flow tracks or debris flow source areas are not apparent upslope of the property.




Photo 2: 1965 air photo showing the approximate location of the subject property. The property is located along the nose of a broad southwest-trending ridge line. Via Santa Teresa is located along the western edge of the site.

Soil and Foundation Investigation

American Soil Testing, Inc. (2014) completed a Soil and Foundation Investigation for the proposed project. Two test borings were drilled on the property, as approximately shown on Figure 8. According to the boring logs, the test borings encountered thin surface soils underlain by very dense to hard claystone bedrock. American Soil Testing, Inc. has provided recommendations for a pier and grade beam foundation system for the proposed residence. Piers should extend a “minimum of 12 feet into the stiff natural soil and at least 3 feet into competent bedrock”.


Site

Site



Photo 3: Panoramic view of the subject property from Via Santa Teresa.

Site Reconnaissance

A site reconnaissance was completed of the subject property (see Photo 3 above) and site vicinity on September 24, 2014. The proposed home site is located along the nose of a broad ridgeline on the southeast portion of the property. The terrain is inclined gently towards the south, as shown on Figure 8, Site Geologic Map and Figure 9, Geologic Cross-Section A-A’. Resistant siltstone and claystone bedrock is exposed within the road cut at the base of the property and as scattered rock outcrops on the site. Evidence of recent fault or landslide activity was not observed on or projecting towards the property or proposed home site during the site reconnaissance. Evidence of active landsliding also was not observed on the property.

FINDINGS

Based upon the results of this Engineering Geologic Investigation, it is my opinion that, from an engineering geologic viewpoint, construction of the proposed residence is feasible on the subject property. Evidence of active faulting or landsliding was not observed during my review of published geologic maps, site reconnaissance, or review of air photos on or projecting towards the property and proposed home site.

In my opinion, it is unlikely that primary ground rupture due to faulting or deep-seated landsliding will impact the proposed residence. Subsurface investigation by American Soil Testing indicates that the proposed home site is underlain by stiff soils and resistant weathered bedrock at shallow depth, as approximately shown on Figure 9, Geologic Cross-Section A-A’. The weathered bedrock underlying the proposed home site should provide good support for the foundation of the proposed residence provided the foundation is constructed according to the recommendations of the project Geotechnical Engineering firm.




Evidence of recent shallow landsliding was not observed during my site reconnaissance, or air photo review on or adjacent to the proposed home site. In my opinion, the hazard from potential shallow landsliding to the proposed home site is very low. Potential debris flow source areas were not observed upslope of the property. In my opinion, the hazard to the property from debris flow landsliding is negligible.

Seismic Hazards

Based upon the results of this investigation, known active or potentially active faults do not pass through the property or proposed home site. The Shannon fault is located about 1000 feet to the southwest of the property. The proposed home site is not located in a County Fault Rupture Hazard Zone (see Figure 6).

It is reasonable to assume that the proposed residence will be subjected to moderate to strong shaking from a major earthquake on the Shannon fault, or one of the other active or potentially active faults in the Bay Area during the design life of the structure. During such an earthquake, the danger from primary fault offset through the proposed home site is very low, but moderate to strong ground shaking is likely to occur.

Based on a deterministic analysis of preliminary data for selected California faults by Blake (2000), the Shannon fault presents the most significant seismic shaking hazard to the site. Using a fault attenuation relationship by Idriss (1994), a peak site acceleration of 0.71 g and a Modified Mercalli shaking intensity of XI are predicted for the site from a possible 6.7 Mw earthquake on the Shannon fault.

Historically, Blake (2000) indicates that the property experienced a site acceleration of 0.41 g and a Modified Mercalli shaking intensity of X due to the 6.6 Mw 1911 Earthquake located about 5 miles from the property. A site acceleration of 0.26 g and a Modified Mercalli shaking intensity of IX occurred on the property during the recent 7.0 Mw 1989 Loma Prieta Earthquake centered about 13 miles southwest of the site. The property experienced 0.15 g from the 1906 Earthquake on the San Andreas fault, located about 49 miles to the northwest.

Properly designed buildings using the Uniform Building Code (ICBO, 1997) and sound engineering practices (California Building and Standards Commission, 2007) should mitigate the damaging effects of ground shaking. As a minimum, the proposed residence should be designed using current building code requirements.




It is possible that secondary fissures or ground cracks may damage the subject property during an earthquake on the Shannon fault. Extensive secondary ground cracks unrelated to primary fault offset occurred during the 1989 Loma Prieta Earthquake in the Santa Cruz Mountains.

Minor to severe damage occurred to several residences in the Los Altos hills area (Hitchcock and others, 1994, and Terratech, Inc., 1990) and the Summit Road area above Los Gatos as a result of secondary fault movement. These fissures or ground cracks were commonly focused on ridge top locations and were associated with weaker shale interbeds (Cotton and others, 1990), preexisting landslides, or intense ground shaking (Hart and others, 1990).

Schmidt and others (1995) identified damage to pavement and pipes associated with the Loma Prieta Earthquake, as shown on Figure 7, Map of 1989 Coseismic Deformation. Damage, however, was not mapped in the immediate site vicinity.

The US Geological Survey (2008) recently cited a 63 percent probability that a Richter magnitude 6.7 or greater earthquake, similar to the 1989 Loma Prieta Earthquake, will occur on one of the active faults in the San Francisco Bay Region by the year 2036. A 21 percent probability was attributed specifically to the nearby San Andreas fault that a large earthquake will occur along its trace by the year 2036, as shown on Figure 10, Earthquake Probability Map.

In addition, Dr. David Schwartz of the U.S.G.S. has cited a 9 percent probability for an earthquake on one of the range-front faults such as the Shannon fault, by the year 2036 in a recent lecture (oral communication).

Landsliding

Based upon my review of published geologic maps, review of air photos, site reconnaissance, and the subsurface investigation by American Soil Testing, the proposed home site is located on the nose of a broad rounded ridgeline. The ridgeline appears to be stable and to be underlain at shallow depth be resistant weathered bedrock.

In my opinion, the hazard from potential deep-seated landsliding to the proposed home site is very low provided the residence is constructed in the location shown on Figure 8. Consequent ly, in my opinion, the hazard from potential earthquake-induced landsliding is very low to the proposed home site.




Springs or seeps were not observed on or near the proposed home site during my review of air photos or site reconnaissance. These groundwater sources, commonly associated with landslides or contributing to potential landsliding were not observed.

I did not observe evidence of recent debris flow landsliding upslope of the property during my review of historical air photos. In my opinion, the hazard from potential debris flows to the proposed home site is negligible.

Liquefaction

Liquefaction most commonly occurs during earthquake shaking in loose fine sands and silty sands associated with a high ground water table. Based on the subsurface investigation, the property is underlain by stiff soils and resistant bedrock at shallow depth that are not susceptible to liquefaction. Shallow groundwater also was not encountered. The County of Santa Clara (2004) has not identified the property as susceptible to potential liquefaction. Liquefaction is therefore, in my opinion, unlikely to occur on the property.

Ground Subsidence

Ground subsidence may occur when poorly consolidated soils densify as a result of earthquake shaking. Since the property is underlain by stiff soils and resistant weathered bedrock at shallow depth, the hazard due to ground subsidence is, in my opinion, considered negligible.

Lateral Spreading

Lateral spreading may occur when a weak layer of material, such as a sensitive silt or clay, loses its shear strength as a result of earthquake shaking. Overlying blocks of competent material may be translated laterally towards a free face. Sensitive silt or clay was not encountered during the subsurface investigation underlying the property. The hazard due to lateral spreading is therefore, in my opinion, considered negligible.

Tsunamis, Seiches, and Flooding

The subject property is located in inland terrain removed from the hazard of inundation by tsunamis (Ritter and Dupre, 1972). The Association of Bay Area Governments (1980b) indicates that the subject property is located in an area removed from the hazard of seiches or flooding caused by dam failure.




LIMITATIONS

This Engineering Geologic Investigation letter report has been prepared for the exclusive use of the addressee, and project architects and engineers, or future homeowners. The opinions, comments, and conclusions presented in this report were based upon information derived from office studies and one site visit. Subsurface investigation was not authorized as part of my investigation. My work has been conducted in general conformance with the standard of care in the field of engineering geology currently in practice in the San Francisco Bay Area. I make no other warranty either expressed or implied.

Thank you for the opportunity to prepare this Engineering Geologic Investigation letter. Please call if you have any questions. Sincerely,

Steven F. Connelly Certified Engineering Geologist 1607

Copies: 7 - Addressee 1 - American Soil Testing, Inc.

A list of References, Table, and Figures are attached and complete this report: Table

Modified Mercalli Intensity Scale........................................................................................... I Figure

Site Location Map................................................................................................................. 1 Regional Topographic Map…………………………………..……………………………… 2 Regional Geologic Map……………………………………………………………………… 3 State Seismic Hazard Zones Map…………………………………………………………… 4 State Landslide Inventory Map…………….………………………………………………… 5 County Geologic Hazard Zones Map…………….……………………….………………… 6 Map of 1989 Coseismic Deformation……………………………………………………… 7 Site Geologic Map................................................................................................................. 8 Geologic Cross-Section A-A’................................................................................................ 9 Earthquake Probability Map................................................................................................ 10




REFERENCES

American Soil Testing, Inc., October 31, 2014, Soil and Foundation Investigation of Proposed Single Family Residence, 20183 Via Santa Teresa, APN 701-26-047, San Jose, Santa Clara County, California.

Association of Bay Area Governments, 1980a, Map of Liquefaction Susceptibility, San Francisco Bay Region, Map Scale 1:250,000.

Association of Bay Area Governments, 1980b, Dam Failure Inundation Areas, San Francisco Bay Region, Map Scale 1:250,000.

Blake, Thomas, F., 2000, EQFAULT, Version 3.00, A Computer Program for the Estimation of Peak Horizontal Acceleration from 3-D Fault Sources, Windows 95/98 Version.

Blake, Thomas, F., 2000, EQSEARCH, Version 3.00, A Computer Program for the Estimation of Peak Horizontal Acceleration from California Historical Earthquake Catalog, Windows 95/98 Version.

California Building and Standards Commission, June 2007, 2007 California Building Code, California Code of Regulations, Title 24, Part 2, Volume 2 of 2, Based on 2006 International Building Code.

California Division of Mines and Geology, 1997, Guidelines for Evaluating and Mitigating Seismic Hazards in California, Special Publication 117.

California Geological Survey, 2003, State of California Seismic Hazard Zones, Santa Teresa Hills Quadrangle, Map Scale 1:24,000.

California Geological Survey, 2006, Landslide Inventory Map of the Santa Teresa Hills Quadrangle, Santa Clara County, California.

Cotton, W.R., Fowler, W.L., and Van Velsor, J.E., 1990, Coseismic Bedding Plane Faults and Ground Fissures Associated with the Loma Prieta Earthquake of 17 October 1989, in "The Loma Prieta (Santa Cruz Mountains), California, Earthquake of 17 October 1989", California Division of Mines and Geology, Special Publication 104.

County of Santa Clara, October 2004, Geological Hazard Zones Digital Database.




Hart, E.W. and Bryant, W.A., revised 1997, Fault-Rupture Hazard Zones in California, Alquist-Priolo Earthquake Fault Zoning Act with Index to Earthquake Fault Zones Maps, California Division of Mines and Geology Special Publication 42.

Hart, E.W., Bryant, W.A., Wills, C.J., and Treiman, J.A., 1990, The Search for Fault Rupture and Significance of Ridgetop Fissures, Santa Cruz Mountains, in "The Loma Prieta (Santa Cruz Mountains), California, Earthquake of 17 October 1989", California, California Division of Mines and Geology, Special Publication 104.

ICBO, 1997, Uniform Building Code: International Conference of Building Officials, Whittier, California, volumes 1 and 2.

Idriss, I.M., 1994, Attenuation Coefficients for Deep and Soft Soil Conditions, personal communication to T.F. Blake.

Kovach, R.L., and Beroza, G.C., 1993, Seismic potential from reverse faulting on the San Francisco Peninsula: Bulletin of Seismological Society of America, v. 83, p. 597-602.

McLaughlin, R.J., Langenheim, V.E., Schmidt, K.M., Jachens, R.C., Stanley, R.G., Jayko, A.S. McDougall, Tinsley, J.C., and Valin, Z.C., 1999, Neogene contraction between the San Andreas fault and the Santa Clara Valley, San Francisco Bay region, California: International Geology Review, v. 41, p. 1-30.

McLaughlin, R.J., Clark, J.C., Brabb, E.E., and Helley, E.J., and Colon, C.J., 2001, Geologic Maps and Structure Sections of the Southwestern Santa Clara Valley and Santa Cruz Mountains, Santa Clara and Santa Cruz Counties, California, Miscellaneous Field Studies Map, MF-2373, Sheet 5 of 8.

Richter, C.F., 1957, Elementary Seismology, San Francisco, CA: W.H. Freeman Co.

Ritter, J.R. and Dupre, W.R., 1972, Map Showing Areas of Potential Inundation by Tsunamis in the San Francisco Bay Region, California, U.S. Geological Survey Map MF-480.

Schmidt, K.M., Ellen, S.D., Haugerud, R.A., Peterson, D.M., and Phelps, G.A., 1995, Breaks in pavement and pipes as indicators of range-front faulting resulting from the 1989 Loma Prieta earthquake near the southwest margin of the Santa Clara Valley, California: U.S. Geological Survey Open-File Report 95-820.

U.S. Geological Survey, 2008, 2008 Bay Area Earthquake Probabilities, http:// earthquake.usgs.gov/regional/nca/ucerf/




TABLE I - MODIFIED MERCALLI INTENSITY SCALE

I Not felt. Marginal and long-period affects of large earthquakes.

II Felt by persons at rest, on upper floors, or favorably placed.

III Felt indoors. Hanging objects swing. Vibration like passing of light trucks. Duration estimated. May not be recognized as an earthquake.

IV Hanging objects swing. Vibration like passing of heavy trucks; or sensation of a jolt like a ball striking walls. Standing motor cars rock. Windows, dishes, doors rattle. Glasses clink. Crockery clashes. In the upper range of IV wooden walls and frames creak.

V Felt outdoors; direction estimated. Sleepers wakened. Liquids disturbed, some spilled. Small unstable objects displaced or upset. Doors swing, close, open. Shutters, pictures move.

VI Felt by all. May frightened and run outdoors. Persons walk unsteadily. Windows, dishes, glassware broken, knickknacks, books, etc., off shelves. Pictures off walls. Furniture moved or overturned. Weak plaster and masonry D cracked. Small bells ring (church, school). Trees, bushes shaken (visible, or heard to rustle).

VII Difficult to stand. Noticed by drivers of motor cars. Hanging objects quiver. Furniture broken. Damage to masonry D, including cracks. Weak chimneys broken at roof line. Fall of plaster, loose bricks, stones, tiles, cornices (also unbraced parapets and architectural ornaments). Some cracks in masonry C. Waves on ponds; water turbid with mud. Small slides and caving along sand and gravel banks. Large bells ring. Concrete irrigation ditches damaged. VIII Steering of motor cars affected. Damage to masonry C; partial collapse. Some damage to masonry B; none to masonry A. Fall of stucco and some masonry walls. Twisting, fall of chimneys, factory stacks, monuments, towers, elevated tanks. Frame houses moved on foundation if not bolted down; loose panel walls thrown out. Decayed piling broken off. Branches broken from trees. Changes in flow or temperature of springs and wells. Cracks in wet ground and on steep slopes.

IX General panic. Masonry destroyed or seriously damaged. (Damage to foundations.) Frame structures, if not bolted, shifted off foundations. Frames racked. Serious damage to reservoirs. Buried pipes broken. Conspicuous ground cracks. In alluviated areas sand and mud ejected, earthquake fountains, sand craters.

X Most masonry and frame structures destroyed with their foundations. Some well-built wooden structures and bridges destroyed. Serious damage to dams, dikes, embankments. Large landslides. Water thrown on banks to canals, rivers, lakes, etc. Sand and mud shifted horizontally on beaches and flat land. Rails bent slightly.

XI Rails bent greatly. Underground pipelines completely out of service.

XII Damage nearly total. Large rock masses displaced. Lines of sight and level distorted. Objects thrown into air.

Source: Richter, C.F., Elementary Seismology, San Francisco, CA: W.H. Freeman Co., 1957.

Note: To avoid ambiguity, the quality of masonry, brick, or other material is specified by the following lettering system. (This has no connection with the conventional classes A, B, and C construction.) Masonry A. Good workmanship, mortar, and design; reinforced, especially laterally, and bound together by using steel, concrete, etc.; designed to resist lateral forces. Masonry B. Good workmanship and mortar; reinforced, but not designed to resist lateral forces. Masonry C. Ordinary workmanship and mortar; no extreme weaknesses, like failing to tie in at corners, but neither reinforced nor designed to resist horizontal forces. Masonry D. Weak materials, such as adobe; poor mortar; low standards of workmanship; weak horizontally.


San Andreas FaultHayward Fault

Calaveras Fault

Greenville Fault

San Gregorio Fault

Project # Approximate Scale Date Figure

1

NN

1 Inch = 10 Miles

Site Location Map




1409 11/20/14

Source: U.S.G.S. and PG&E, 2000

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Llagas Cr

Los Capitancillos Cr

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Twin Fall Cr

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Calero Reservoir

GuadalupeReservoir

AlmadenReservoir

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English Town

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AlmadenCanyon

BaldyRyanCanyon

BarretCanyon

CherryCanyon

ChilanianGulch

DeepGulch

EdsonCanyon

JacquesGulch

LarrabeeGulch

LimekilnCanyon

PineTree

Canyon

SantaClaraValley

Hacienda Tunnel

BaldMountain

CoyotePeak

FernPeak

TulareHill

BaldPeaks

ChurchHill

MineHill

MudSprings

SantaTeresaSpring

Western Career College

Manzanita Ridge

Jacques Ridge

Santa Teresa Hills

PO

PO

PO

Cottle House

Gilman Ranch

Mexican Camp

Peckham Ranch

Stile Ranch

The Cross

Santa TeresaGolfCourse

County of SantaClaraGirls Ranch

Cape HornPass

Portezuelo

AlvirezField

BullRun

HaciendaCem

HidalgoCem

Old MexicanCem

LosGatos

MorganHill

SantaTeresaHills

Laurel

LickObservatory

LomaPrieta

San JoseWest

San JoseEast

MountMadonna

41

11

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41

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17

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20

23

03

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19

6

21

22

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41

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647'

121°47'

6

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45'30"

41

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121°

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30"EG

41

20

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880

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170

41

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10 E52'

10

N

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17

6

U.S. DEPARTMENT OF THE INTERIORU. S. GEOLOGICAL SURVEY

CALIFORNIA

ADJOINING 7.5' QUADRANGLES

QUADRANGLE LOCATION

Imagery................................................NAIP, January 2010Roads..............................................©2006-2010 Tele AtlasNames...............................................................GNIS, 2010Hydrography.................National Hydrography Dataset, 2010Contours............................National Elevation Dataset, 2010

SANTA TERESA HILLS, CA2012

Interstate Route State Route

ROAD CLASSIFICATION

Ramp 4WD

US Route Local Road

Interstate Route State RouteUS RouteWX ./ H

SANTA TERESA HILLS QUADRANGLECALIFORNIA-SANTA CLARA CO.

7.5-MINUTE SERIES

SANTA TERESA HILLS, CA2012

Interstate Route State Route

ROAD CLASSIFICATION

Ramp 4WD

US Route Local Road

Check with local Forest Service unitfor current travel conditions and restrictions.

FS Primary Route FS High Clearance Route

FS PassengerRouteJ K L

Interstate Route State RouteUS RouteWX ./ H

USGS: USFS:

This map was produced to conform with the National Geospatial Program US Topo Product Standard, 2011.A metadata file associated with this product is draft version 0.6.1

CONTOUR INTERVAL 40 FEETNORTH AMERICAN VERTICAL DATUM OF 1988

SCALE 1:24 000

1 0.5 0

MILES

1

1000 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000

FEET

1000 500 0 METERS 1000 2000

21KILOMETERS00.51

Imagery......................................................NAIP, May 2010Roads................................................©2006-2011 TomTomNames...............................................................GNIS, 2011Hydrography.................National Hydrography Dataset, 2010Contours.............................National Elevation Dataset, 1999Boundaries..............Census, IBWC, IBC, USGS, 1972 - 2010

North American Datum of 1983 (NAD83)World Geodetic System of 1984 (WGS84). Projection and1 000-meter grid: Universal Transverse Mercator, Zone 10S

Produced by the United States Geological Survey

10 000-foot ticks: California Coordinate System of 1983(zone 3)

North American Datum of 1983 (NAD83)World Geodetic System of 1984 (WGS84). Projection and1 000-meter grid: Universal Transverse Mercator, Zone 10S

Produced by the United States Geological Survey

10 000-foot ticks: California Coordinate System of 1983(zone 3)

Imagery<IMG_LEADER><IMG_CITATION>Roads<TRANS_LEADER>©2006-2011 TomTomRoads within US Forest Service Lands.............FSTopo Data with limited Forest Service updates, 2009Names...............................................................GNIS, 2011Hydrography<HYDRO_LEADER>National Hydrography Dataset, <HYDRO_DATE>Contours<HYPSO_LEADER><HYPSO_CITATION>Boundaries..............Census, IBWC, IBC, USGS, 1972 - 2010

U.S. National Grid

100,000-m Square ID

Grid Zone Designation

EG FG

6 00

10S

×

ÙMN

GN

UTM GRID AND 2012 MAGNETIC NORTHDECLINATION AT CENTER OF SHEET

0° 43´13 MILS

13° 53´247 MILS

Project # Scale Date Figure

2

N

1 Inch = 2000 Feet

Regional Topographic Map




1409 11/20/14

SITE


Regional Geologic Map


31409 11/20/141 Inch = 1000 Feet




N

Source: McLaughlin and others, 2001

EXPLANATIONGeologic Contact, dashed where approximate dotted where concealed, queried where uncertain

Fault Trace, dashed where approximate, dotted where concealed, queried where uncertain

Thrust Fault, barbs on upper plate

Strike and Dip of Bedding

Landslide, arrows indicate direction of movement

SITE

Silica Carbonate Rock (Miocene?)

Serpentinized Ultramafic and minor Gabbroic Rocks (Jurassic)

Basaltic Flows (Lower Jurassic)

Chert (Lower Cretaceous and Lower Jurassic)

Melange and broken formation (Upper Cretaceous & younger)

Basaltic Volcanic rocks

Basaltic Flows, Breccia, and Tuff (Mid Cretaceous)

Limestone (Upper and Mid Cretaceous)

Melange of the Central Belt

Franciscan ComplexMelange (Upper Cretaceous)

Sandstone and Shale of Great Valley Sequence (Upper Cretaceous)

Mudstone and Sandstone of Mt. Chual (lower Eocene)

Alluvial Fan Deposits (Pleistocene)

Alluvial Fan Deposits (Holocene)

ShannonFault?


SITE


411/20/141 Inch = 2000 Feet




N

Base: California Geological Survey, 2003

State Seismic Hazard Zones Map

1409

EXPLANATION

Liquefaction

Areas where historic occurrence of liquefaction, or localgeological, geotechnical and groundwater conditionsindicate a potential for permanent ground displacementssuch that mitigation would be required.

Earthquake-Induced Landslides

Areas where previous occurrence of landslide movement, or local topographic, geological, geotechnical and subsurface water conditions indicate a potential for permanent ground displacements such that mitigation would be required.



5

N

1 Inch = 1000 Feet




1409 11/20/14

State Landslide Inventory Map

Active or historic

Dormant - Young

Dormant - Mature

Dormant - Old

Rock Slide

Soil Slide

Earth Flow

Debris Flow

Definite

Probable

Questionable

EXPLANATION

Source: California Geological Survey, 2006

SITE



6

N

1 Inch = 500 Feet

County Geologic Hazard Zones Map


Consulting in Engineering Geology

Consulting in Engineering Geology

1409 11/20/14

County of Santa Clara (2004)

SITE


Fault Rupture Hazard Zone

Fault Trace

Fault-Related Lineations

EXPLANATION

Landslide Deposit

Map of 1989 Coseismic Deformation


71409 11/20/141 Inch = 1 Mile




N

Source: Schmidt and others, 1995

Categories of Damage

COSEISMIC PAVEMENT BREAKS

IN ASPHALT

Linear zone of complex rupture; denotes area ofsevere damageFresh break or buckle suggestive of contractionaldeformationFresh break with unspecified sense of deformation

IN CONCRETE

Fresh contractional break in channel lining ofLos Gatos CreekFresh break or buckle suggestive of contractionaldeformationApparently fresh break with unspecified senseof deformationBreak with unspecified sense of deformation

IN BOTH ASPHALT AND CONCRETE

EXTENSIONAL RUPTURE IN BOTH PAVEMENT AND SOIL

OTHER BREAKS

In both pipe and pavement

Pavement break that pre-dates the earthquake

Combination of pre-earthquake and coseismicbreak in pavement

Contractional deformation that post-datesthe earthquake

OTHER SYMBOLSFault

COSEISMIC PIPE BREAKS

Underground water line

Underground natural-gas distribution line

Above-ground natural-gas distribution lineMore than one type of pipe

SITE


Project #

1409

FigureDateScale

11/20/14




8

Site Geologic Map

1 Inch = 40 Feet

N

B1

B2

ProposedResidence

A


A=

EXPLANATION

Sandstone and Shale of Great Valley Sequence

Test Boring, American Soil Testing, Inc., 2014

Geologic Cross-Section

B1

Kus

A A=

Kus

Kus

Kus





1409 11/20/14


91 Inch = 40 Feet

Geologic Cross-Section A-A’

N13E A’A

ProposedResidence

B2Elevation (Feet)

400

360

320

Kus

KusWeathered BedrockSandstone and Shale of

the Great Valley Sequence

280

580

880

680

17

1

1

80

101

101

101

21%

3%

6%

7%

3%

31%

probability for one or moremagnitude 6.7 or greaterearthquakes from 2007 to 2036.

63%

1%

CALAVERAS FAULT

RODGERSCREEK

FAULT

CONCO

RD–GREEN

VALLEY

FAULT

HAYWARD

FAULT

GREENVILLE FAULT

GREENVILLE

MT. DIABLO

THRUST FAULT

MT. DIABLO

THRUST FAULT

CALAVERAS FAULT FAULT

CONCO

RD–GREEN

VALLEY

FAULT

SAN

ANDREAS

FAULTP a c i f i cO

c e a n

SANGREGORIO

FAULT

RODGERSCREEK

FAULT

HAYWARD

FAULT

MontereyBay

SanFrancisco

Bay

Probability of magnitude 6.7 or greater quakes before 2036 on the indicated fault

Expanding urban areas

Increasing probability along fault segments

0

0 20 KILOMETERS

20 MILES

NN

%

San Francisco

Half MoonBay

Pacifica

Oakland

Sacramento

Stockton

DanvilleDanville

Antioch

PaloAlto

SanMateo

WalnutCreek

WalnutCreek

LivermorePleasantonHayward

Tracy

Santa CruzWatsonville

GilroyGilroy

MontereySalinas

SanJose

SantaRosa

Petaluma

NovNovato

SanRafael

NapaSonoma

Vallejo

EXTENT OF RUPTURE

IN LOMA PRIETA QUAKE

EXTENT OF RUPTURE

IN LOMA PRIETA QUAKE


10As Shown

Earthquake Probability Map




1409 11/20/14

URL http://earthquake.usgs.gov/regional/nca/ucerf/

SITE


steven f. connelly, c.e.g

Documents