.03 EXC-2008-14 Amy Cheng
CITY OF CUPERTINO
10300 Torre Avenue, Cupertino, California 95014
DEPARTMENT OF COMMUNITY DEVELOPMENT REPORT FORM
Application: EXC-2008-14; TR-2008-05, EA-2008-05 Agenda Date: August 26,2008
Applicant: Amy Cheng
Property Owner: Amy Cheng
Property Location: San Juan Road, APN 342-22-078
Application Summary:
Hillside Exception to construct a new two-story, 3,304 square-foot single family
residence on a slope greater than 30%.
Tree Removal request to remove and replace three specimen size oaks.
RECOMMENDATION:
Staff recommends that the Planning Commission approve file no. EXC-2008-14 and TR-
2008-05 subject to the model resolutions.
PROJECT DATA:
Existing Zoning District:
Lot Size:
RHS-21 (Residential Hillside Zoning)
15,476 sq. ft., 0.355 acre
Proposed
Ordinance Allowance
Residence Square Footage:
1 st &'2nd Floors
Garage
2,813 sq.ft.
491 sq.ft.
3,304 sq.ft.
3,378 sq.ft.
Setbacks:
Front
Sides
Rear
10, 27 feet
10,24 feet
86, 94 feet
1 st Floor
10 feet (min)
10 feet
20 feet
2nd Floor
25 feet
15 feet
25 feet
Building Height:
Grading Quantity:
Parking:
Environmental Review:
24 - 30 feet
<200 cubic yards
6 stalls
Mitigated Negative Declaration
30 feet
2,500 cubic yards
6 stalls
BACKGROUND:
The applicant Amy Cheng is requesting a hillside exception and tree removal permit to
facilitate the constructon of a new, two-story, 3,304 square-foot single-family residence
on a slope greater than 30% in a RHS-21 zoning district. The lot is vacant but
3-1
EXC-2008-14, TR-2008-05
August 28, 2008
Page 2
surrounded by other hillside single-family residences in the Inspiration Heights area of
Cupertino. The area was subdivided in the County in 1917 and later annexed to the
City. Development of these lots is often complicated by the fact that the existing San
Juan Road alignment does not match the location of the mapped roadway, which was
offered to the County, but never accepted. According to various title companies the
mapped roadway is still owned by the abutting property owners.
DISCUSSION:
Zoning Consistency
The proposed dwelling complies with the RHS zoning regulations with respect to
setbacks, building height, square footage, and grading quantity (See Project Data). A
hillside exception is being requested for construction on a slope greater than 30%. The
building site is not on a prominent ridgeline.
Exception for Developments on Slopes Greater Than 30%
The RHS- Hillside Ordinance prohibits any structures or improvements over 500 square
feet in area to occur on slopes greater than thirty percent unless an exception is granted.
The lot on the downhill side of San Juan Road is fairly steep as are the adjoining
downhill properties on San Juan Road.
Geological Review
The City Geologist, Cotton Shires Associates, has reviewed the 1999 geotechnical report
and 2007 update submitted by the project geologist, Earth Investigations Consultants,
and they conclude that the project is geotechnically feasible (Exhibit A, B & C) based on
the manner of construction, which includes building on the existing grade with a
minimum of grading and founding the residence on a pier and grade beam foundation
system with large diameter piers embedded deep into the bedrock. The City Geologist
recommended that the private geologist's recommendations be incorporated into the
construction plans, the foundation be sufficiently imbedded into the bedrock, grading
kept to a minimum and that storm drainage be strictly controlled. Present policies that
encourage the filtration of storm waters onsite must be waived because of the potential
for shallow surficial sloughing of soil, landsliding, soil creep etc. Drainage must be
designed to convey storm waters to the street. The City Geologist's recommendations
are incorporated as a condition of approval in the model resolution.
Tree Removal
A tree survey was prepared for the property and limited to the trees within and
adjacent to the proposed building site (Exhibit D). The report identified six specimen
size (10+ inches in diameter) Coast Live Oaks. The City Arborist, David Babby, has
reviewed the report and noted in addition, three non-specimen size oaks (< 10" in
diameter) proposed for removal and not requiring a permit for removal (Exhibit E).
2
3-2
EXC-2008-14, TR-2008-05
August 28, 2008
Page 3
The original residential design and plan intended for all six specimen size oaks to be
retained. The City Arborist feels that this is not realistic because the close proximity of
the proposed home and decking will adversely impact five of the six oaks (trees # I, 2,
4,5, and 6) by jeopardizing their longevity and structural form. The City Arborist feels
the potential for significant damage is extremely high. The applicant has re-evaluated
her plans and currently proposes the removal of three of the impacted specimen size
oaks (tree nos. 1,2 and 4). The first two are located in a proposed interior courtyard
area and tree no. 4 is located under a deck. The Protected Tree Ordinance provides for
two to one replacement of these oaks with 24" box trees. Staff is recommending coast
live oaks as replacements. The City Arborist offers recommendations for the protection
of oak trees no. 5 & 6 not slated for removal, but in the probable event that they are
significantly damage, the model resolution provides for approval of removal of the
trees and suitable replacement trees per the Protected Tree Ordinance.
Submitted by: Colin Jung, Senior Planner s==: (I
Approved by: Steve Piasecki, Director of Community Develop~
Enclosures:
Model Resolutions for Hillside Exception and Tree Removal
Initial Study and ERC Recommendation
Exhibit A: Geotechnical Investigation /Proposed New House by Earth Investigations
Consultants dated January 29, 1999.
Exhibit B: Geotechnical Update Proposed Single Family Residential Development/ 0
San Juan Road by Earth Investigations Consultants dated September 26,
2007.
Exhibit C: Geologic Peer Review by Cotton, Shires Associates, Inc. dated May 14,
2008.
Exhibit D: A Tree Survey Next to 22811 San Juan Road in Cupetino dated December
11,2007
Exhibit E: Review of San Juan Road, Cupertino, CA Arborist Report by David
Babby, Arbor Resources, dated May 6, 2008.
Plan Set
G: \ Planning\ PDREPORT\ pcEXCreports \ 2007 excreports\ EXC-2008-14.doc
3
3-3
EXC-2008-14
CITY OF CUPERTINO
10300 Torre Avenue
Cupertino, California 95014
RESOLUTION NO.
OF THE PLANNING COMMISSION OF THE CITY OF CUPERTINO
APPROVING A HILLSIDE EXCEPTION FOR A NEW 3,304 SQUARE FOOT
RESIDENCE ON A SLOPE GREATER THAN 30% ON SAN JUAN ROAD,
APN 342-22-078.
SECTION I: PROTECT DESCRIPTION
Application No.:
Applicant:
Location:
EXC-2008-14
Amy Cheng
(no address no.) San Juan Road, APN 342-22-078
SECTION II: FINDINGS FOR EXCEPTION
WHEREAS, the Planning Commission of the City of Cupertino received an application
for a Hillside Exception, as described on Section II of this Resolution; and
WHEREAS, the necessary notices have been given in accordance with the Procedural
Ordinance of the City of Cupertino, and the Planning Commission has held one or more
Public Hearings on this matter; and
WHEREAS, the applicant has met the burden of proof required to support this
application, and has satisfied the following requirements:
1. The proposed development will not be Injurious to property or
improvements in the area nor be detrimental to the public health and safety.
2. The proposed development will not create a hazardous condition for
pedestrian or vehicular traffic.
3. The proposed development has legal access to public streets and public
services are available to serve the development.
4. The proposed development requires an exception, which involves the least
modification of, or deviation from, the development regulations prescribed in
this chapter necessary to accomplish a reasonable use of the parcel.
5. All alternative locations for development on the parcel have been considered
and have been found to create greater environmental impacts than the
location of the proposed development.
6. The proposed development does not consist of structures on or near known
geological or environmental hazards that have been determined by expert
testimony to be unsafe or hazardous to structures or persons residing therein.
7. The proposed development includes grading and drainage plans that will
ensure that erosion and scarring of the hillsides caused by necessary
construction of the housing site and improvements will be minimized.
3-4
Resolution No.
Page 2
EXC-2008-14
August 26, 2008
8. The proposed development consists of structures incorporating designs,
colors, materials, and outdoor lighting which blend with the natural hillside
environment and which are designed in such a manner as to reduce the
effective visible mass, including building height, as much as possible without
creating other negative environmental impacts.
9. The ,proposed development is located on the parcel as far as possible from
public open space preserves or parks (if visible therefrom), riparian corridors,
and wildlife habitats unless such location will create other, more negative
environmental impacts.
10. The proposed development is otherwise consistent with the City's General
Plan and with the purposes of this chapter as described in Section 19.40.010.
NOW, THEREFORE, BE IT RESOLVED:
That after careful consideration of maps, facts, exhibits, testimony and other evidence
submitted in this matter, application no. EXC-2008-14 is hereby approved; and
That the subconclusions upon which the findings and conditions specified in this
Resolution are based and contained in the Public Hearing record concerning
Application EXC-2008-14, as set forth in the Minutes of the Planning Commission
Meeting of August 26,2008, and are incorporated by reference herein.
SECTION III: CONDITIONS ADMINISTERED BY THE COMMUNITY
DEVELOPMENT DEPT.
1. APPROVED EXHIBITS
Approval is based on the plan set titled: "New Single Family Residencej APN
342-22-078jSan Juan RoadjCupertino, California" dated 10-29-07 and consisting
of 10 sheets labeled Al through A10, except as may be amended by this
resolution.
2. GEOTECHNICAL REVIEW
Prior to building permit approval, the applicant shall comply with the
recommendations outlined in the Cotton Shires & Associates, Inc. Geologic Peer
Review Letter dated May 14, 2008 and pertaining to the proposed development.
3. NOTICE OF FEES, DEDICATIONS, RESERVATIONS OR OTHER EXACTIONS
The Conditions of Project Approval set forth herein may include certain fees,
dedication requirements, reservation requirements, and other exactions.
Pursuant to Government Code Section 66020(d) (1), these Conditions constitute
written notice of a statement of the amount of such fees, and a description of the
dedications, reservations, and other exactions. You are hereby further notified
that the 90-day approval period in which you may protest these fees, dedications,
reservations, and other exactions, pursuant to Government Code Section
66020(a), has begun. If you fail to file a protest within this 90-day period
2
3-5
Resolution No.
Page 3
EXC-2008-14
August 26, 2008
complying with all of the requirements of Section 66020, you will be legally
barred from later challenging such exactions.
SECTION IV:
DEP ARTMENT
CONDITIONS ADMINISTERED BY THE PUBLIC WORKS
4. STREET WIDENING
Street widening, improvements and dedications shall be provided in accordance
with City Standards and specifications and as required by the City Engineer.
5. CURB AND GUTTER IMPROVEMENTS
Curbs and gutters, sidewalks and related structures shall be installed In
accordance with grades and standards as specified by the City Engineer.
6. FIRE HYDRANT
Fire hydrants shall be located as required by the City and Santa Clara County Fire
Department as needed.
7. GRADING
Grading shall be as approved and required by the City Engineer in accordance
with Chapter 16.08 of the Cupertino Municipal Code. 401 Certifications and 404
permits maybe required. Please contact Army Corp of Engineers and/ or Regional
Water Quality Control Board as appropriate.
8. DRAINAGE
Drainage shall be provided to the satisfaction of the City Engineer. Pre and post-
development calculations must be provided to indicate whether additional storm
water control measures are to be installed.
9. UNDERGROUND UTILITIES
The developer shall comply with the requirements of the Underground Utilities
Ordinance No. 331 and other related Ordinances and regulations of the City of
Cupertino, and shall coordinate with affected utility providers for installation of
underground utility devices. The developer shall submit detailed plans showing
utility underground provisions. Said plans shall be subject to prior approval of the
affected Utility provider and the City Engineer.
10. TRANSFORMERS
Electrical transformers, telephone vaults and similar above ground equipment
enclosures shall be screened with fencing and landscaping or located underground
such that said equipment is not visible from public street areas. The transformer
shall not be located in the front or side building setback area.
3
3-6
Resolution No.
Page 4
EXC-2008-14
August 26, 2008
---
----
11. BEST MANAGEMENT PRACTICES
Utilize Best Management Practices (BMP's), as required by the State Water
Resources Control Board, for construction activity, which disturbs soil. BMP plans
shall be included in grading and street improvement plans.
12. EROSION CONTROL PLAN
The developer must provide an approved erosion control plan by a registered civil
engineer. This plan should include all erosion control measures use to retain
materials on site. Erosion control notes shall be stated on the plans.
PASSED AND ADOPTED this 26th day of August 2008, at a Regular Meeting of the
Planning Commission of the City of Cupertino by the following roll call vote:
AYES:
NOES:
ABSTAIN:
ABSENT:
COMMISSIONERS:
COMMISSIONERS:
COMMISSIONERS:
COMMISSIONERS:
ATTEST:
APPROVED:
Steve Piasecki
Director of Community Development
Marty Miller, Chair
Cupertino Planning Commission
G: \ Planning \ POREPORT\ RES\ EXC-2008-14res.doc
4
3-7
TR-2008-05
CITY OF CUPERTINO
10300 Torre Avenue
Cupertino, California 95014
RESOLUTION NO.
OF THE PLANNING COMMISSION OF THE CITY OF CUPERTINO APPROVING A
TREE REMOVAL REQUEST TO REMOVE AND REPLACE 3 SPECIMEN SIZE OAK
TREES IN CONJUNCTION WITH A PROPOSED HILLSIDE EXCEPTION (EXC-2008-14)
SECTION I: PROTECT DESCRIPTION
Application No.:
Applicant:
Location:
TR-2008-05
Amy Cheng
(no address no.) San Juan Road, APN 342-22-078
SECTION II: FINDINGS
WHEREAS, the Planning Commission of the City of Cupertino received an application
for the removal and replacement of 3 trees i~ conjunction with a proposed hillside
exception (EXC-2008-14); and
WHEREAS, the 3 trees are specimen size coast live oaks with trunk diameters greater
than or equal to 10 inches, subject to Chapter 14.18 of the Municipal Code, pertaining to
Protected Trees; and.
WHEREAS, the necessary public notices have been given in accordance with the
Procedural Ordinance of the City of Cupertino, and the Planning Commission has held
one or more public hearings on this matter; and
NOW, THEREFORE, BE IT RESOLVED:
That after careful consideration of maps, facts, exhibits, testimony and other evidence
submitted in this matter, the application for tree removal is hereby approved; and
That the subconclusions upon which the findings and conditions specified in this
Resolution are based and contained in the. Public Hearing record concerning
Application TR-2008-05, as set forth in the Minutes of the Planning Commission
Meeting of August 26,2008 are incorporated by reference herein.
SECTION III: CONDITIONS ADMINISTERED BY THE COMMUNITY
DEVELOPMENT DEPT.
1. APPROV At ACTION
The applicant is approved to remove three trees on site and designated #1, #2,
and #4 in accordance with the applicant's tree survey/removal plan identified on
sheet Al dated 10/29/07 in the approved plan set titled: " New Single Family
Residence/ APN: 342-22-78/San Juan Road/Cupertino, California" and a tree
3-8
Resolution No. TR-2008-05 August 26,2008
Page 2
survey prepared by Barrie D. Coate & Associates dated December 11, 2007,
except as may be amended by the conditions of this Resolution.
2. TREE REPLACEMENTS
Prior to building occupancy, the applicant shall plant and provide irrigation for
six 24" box coast live oaks downslope of the residence.
For any additional protected trees that are removed due to construction damage,
hazardous conditions or death, the applicant shall be required to replace these
trees in accordance with the Protected Trees Ordinance. Species and size of
replacement trees shall be reviewed and approved by the Community
Development Department.
3. NOTICE OF FEES, DEDICATIONS, RESERVATIONS OR OTHER
EXACTIONS
The Conditions of Project Approval set forth herein may include certain fees,
dedication requirements, reservation requirements, and other exactions.
Pursuant to Government Code Section 66020(d) (I), these Conditions constitute
written notice of a statement of the amount of such fees, and a description of the
dedications, reservations, and other exactions. You are hereby further notified
that the 90-day approval period in which you may protest these fees, dedications,
reservations, and other exactions, pursuant to Government Code Section
66020(a), has begun. If you fail to file a protest within this 90-day period
complying with all of the requirements of Section 66020, you will be legally
barred from later challenging such exactions.
PASSED AND ADOPTED this 26th day of August 2008, at a Regular Meeting of the
Planning Commission of the City of Cupertino by the following roll call vote:
AYES:
NOES:
ABSTAIN:
ABSENT:
COMMISSIONERS:
COMMISSIONERS:
COMMISSIONERS:
COMMISSIONERS:
ATTEST:
APPROVED:
Steve Piasecki
Director of Community Development
G: \ Planning \ PDREPORT\ RES \ 2008 \ TR-2008-05 res. doc
Marty Miller, Chair
Cupertino Planning Commission
3-9
City of Cupertino
10300 Torre Avenue
Cupertino. CA 95014
(408) 777-3251
FAX (408) 777-3333
Community Development Department
CUPEIQ'INO
PROJECT DESCRIPTION:
Project Title: c..~. ~ ; rlo.ft"\ c.Q.,
Project Location: ~ ~ ::f"JI!JIt'. R cO ~ 'c.e-)N JPfLJ'(\
Project DeSCrlption:F"4i.s~ i~3~"l.y ,..,.~ ;d.~(.Q,
0(\ ct...s~ l ".. ~ co
Environmental Se
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PROJECT DESCRIPTION.:-Ft .'
Site Area ~c~.-'S;Ll76 mildmg Co~erage -i.?zi.fo~ Ex~st. BUildin.g - 0 sJ.._t!rolJ,o:>>~ct I, I
Bldg. - 3j~<;"tsJ. Zone -J~.\-\S: -')..\ G.P. D~tion - \jP,-('\l ~~ ~,^5,n/. ~j~{t;j . I
Assessor's Parcel No. - 3Lf2- 2..2 -~ tft.-1o-cre sl~~ ~~I+-t ,fi,rw.v 4J
If Residential, Units/Gross Acre -
Total# Rental/Own Bdrms
Total s.f.
Price
Unit Type #1
Unit Type #2
Unit Type #3
Unit Type #4
Unit Type #5
Applicable Special Area Plans: (Check)
o Monta Vista Design Guidelines
o
S. De Anza Conceptual
o
o
N. De Anza Conceptual
o
S. Sara-Sunny Conceptual
Stevens Crk Blvd. Conceptual
o
Stevens Creek Blvd. SW & Landscape
If Non-Residential, Building Area - sJ. FAR - Max.
Employees/Shift - _Parking Required Parking Provided
Project Site is Within Cupertino Urban Service Area - YES}( NO 0
3-10
A. CUPERTINO GENERAL PLAN SOURCES D. OUTSIDE AGENCIES (Continued)
1. Land Use Element 26. Midpeninsula Regional Open Space District
2. Public Safety Element 27. County Parks and Recreation Department
3. Housing Element 2B. Cupertino Sanitary District
4. Transportation Element 29. Fremont Union High School District
.5. Environmental Resources 30. Cupertino Union School District
6. AppendiX A- Hillside Development 31. Pacific Gas and Electric
7. Land Use Map 32. Santa Clara County Fire Department
8. Noise Element Amendment 33. County Sheriff
9. City Ridgeline Policy 34. CAL TRANS
10. Constraint Maps 35. County Transportation Agency
36. Santa Clara Valley Water District
B. CUPERTINO SOURCE DOCUMENTS
11. Tree Preservation ordinance 778 E. OUTSIDE AGENCY DOCUMENTS
12. City Aerial Photography Maps 37. BAAQMD Survey of Contaminant
13. .Cupertino Chronicle" (California History Excesses
Center, 1976) 38. FEMA Flood Maps/SCVWD Flood Maps
14. Geological Report (site specific) 39. USDA, "Soils of Santa Clara County"
15. Parking Ordinance 1277 40. County Hazardous Waste Management
16. Zoning Map Plan
17. Zoning Code/Specific Plan Documents 41. County Heritage Resources Inventory
1 B. City Noise Ordinance 42. Santa Clara Valley Water District Fuel
Leak Site
C. CITY AGENCIES Site 43. CalEPA Hazardous Waste and
19. Community Development Dept. List Substances Site
20. Public Works Dept.
21. Parks & Recreation Department F. OTHER SOURCES ,,-
22. Cupertino Water Utility 44. Project Plan Set/Application Materials
45. Field Reconnaissance
D. OUTSIDE AGENCIES 46. Experience w/project of similar
23. County Planning Department scope/characteristics
24. Adjacent Cities' Planning Departments 47. ABAG Projection Series
25. County Departmental of Environmental
Health
A. Complete all information requested on the Initial Study Cover page. LEAVE BLANK SPACES
ONLY WHEN A SPECIFIC ITEM IS NOT APPLICABLE.
B. Consult the Initial Study Source List; use the materials listed therein to complete, the checklist.
information in Categories A through O.
C. You are encouraged to cite other relevant sources; if such sources are used, job in their title(s)
in the "Source" column next to the question to which they relate.
D. If you check any of the "YES" response to any questions, you must attach a sheet explaining the
potential impact and suggest mitigation if needed.
E. When explaining any yes response, label your answer clearly (Example "N - 3 Historical") Please
try to respond concisely, and place as many explanatory responses as possible on each DaQe.
F. Upon completing the checklist, sign and date the Pre parer's Affidavit.
G. Please attach the following materials before submitting the Initial Study to the City.
,(project Plan Set of Legislative Document
,(Location map with site clearly marked (when applicable)
3-11
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[and Supporting Information Sources] C1)cE enc~-'" en c E E
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III. AIR QUALITY - Where available, the
significance criteria established by the .
applicable air quality management or air
pollution control district may be relied upon
to make the following determinations. Would
the project:
a) Conflict with or obstruct implementation of 0 0 0 )i
the applicable air quality plan? [5,37,42,44]
b) Violate any air quality standard or 0 0 0 ~
contribute substantially to an existing or
projected air quality violation? [5,37,42,44] , .
c) Result in a cumulatively considerable net 0 0 0 :~
increase of any criteria pollutant for which
the project region is non-attainment under an .
applicable federal or state ambient air quality
standard (including releasing emissions
which exceed quantitative thresholds for
ozone precursors)? [4,37,44]
d) Expose sensitive receptors to substantial 0 0 0 .!\
pollutant concentrations? [4,37,44] . ,~
e) Create objectionable odors affecting a 0 0 0 A
substantial number of people? [4,37,44] ."
IV. BIOLOGICAL RESOURCES -- Would . "
the project: . . . .
a) Have a substantial adverse effect, either 0 0 0 ;(
directly or through habitat modifications, on
any species identified as a candidate,
sensitive, or special status species in local or
regional plans, policies, or regulations, or by
the California Department of Fish and Game
or U.S. Fish and Wildlife Service?
[5,10,27.44]
b) Have a substantial adverse effect on any 0 0 0 ~
riparian habitat or other sensitive natural
community identified in local or regional
plans, policies, regulations or by the
California Department of Fish and Game or
US Fish and Wildlife Service? [5,10,27,44]
c) Have a substantial adverse effect on 0 0 0 ~
federally protected wetlands as defined by
Section 404 of the Clean Water Act
(including, but not limited to, marsh, vernal
3-12
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ISSUES: "Ij:~ 1-1j:"1U0 1-'- CIS o CIS
c_ ~'Ei,2'E- II):!:: c. zc.
[and Supporting Information Sources] Cl)cE II) C E E
'0,2'- CI) en :t:= 0 CI) .!2l-
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D..UJ UJ C ..JUJ
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pool, coastal, etc.) through direct removal,
filling, hydrological interruption, or other
means? [20,36,44]
d) Interfere substantially with the movement 0 0 0 ~
of any native resident or migratory fish or
wildlife species or with established native
resident or migratory wildlife corridors, or
impede the use of native wildlife nursery
sites? [5,10,12,21,26]
e) Conflict with any local policies or 0 0 y! 0
ordinances protecting biological resources,
such as a tree preservation policy or .' .
ordinance? [11,12,41]
f) Conflict with the provisions of an adopted . '
Habitat Conservation Plan, Natural 0 0 0 )S..
Community Conservation Plan, or other
approved local, regional, or state habitat
conservation plan? [5,10,26,27]
V. CULTURAL RESOURCES -- Would the
project: ~
."
a) Cause a substantial adverse change in 0 0 0 :,~
the significance of a historical resource as
defined in ~ 15064.5? [5,13,41]
b) Cause a substantial adverse change in 0 0 0 J'l
the significance of an archaeological
resource pursuant to ~15064.5? [5,13,41]
c) Directly or indirectly destroy a unique 0 0 0 D(
paleontological resource or site or unique
geologic feature? [5,13,41]
d) Disturb any human remains, including 0 0 0 ~
those interred outside of formal cemeteries?
[1,5]
VI. GEOLOGY AND SOilS - Would the
project:
a) Expose people or structures to potential
substantial adverse effects, including the risk
of loss, injury, or death involving:
i) Rupture of a known earthquake fault, as 0 0 0 f4
delineated on the most recent Alquist-Priolo
Earthquake Fault Zoning Map issued by the
3-13
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ISSUES: -I; ~ ""1; = 1ii 0 ....-l'lS o l'lS
c._ :"2 ~.2'e- en := c. zc.
[and Supporting Information Sources] G) c E en C E E
'0.2'- G)tJJ =0 G)!!P-
~en ..J- :!:u ..Jen
en C
State Geologist for the area or based on
other substantial evidence of a known fault?
Refer to Division of Mines and Geology
Special Publication 42. [2,14,44]
ii} Strong seismic ground shaking? 0 0 lit 0
[2,5,10,44]
Hi} Seismic-related ground failure, including 0 0 0 ~
liquefaction? [2.5,10,39,44]
iv} Landslides? [2,5,10,39,44] 0 0 p\ 0
b} Result in substantial soil erosion or the 0 0 0 )g.
loss of topsoil? [2,5,10,44]
c} Be located on a geologic unit or soil that is 0 0 0 .~
unstable, or that would become unstable as
a result of the project, and potentially result ! ,
in on- or off-site landslide, lateral spreading,
subsidence. liquefaction or collapse?
[2,5,10,39]
d} Be located on expansive soil, as defined 0 0 0 0
in Table 18-1-B of the Uniform Building Code
(1997), creating substantial risks to life or
property? [2.5,10]
e} Have soils incapable of adequately 0 0 0 _.~
supporting the use of septic tanks or
alternative waste water disposal systems
where sewers are not available for the
disposal of waste water? [6,9.36,39]
VII. HAZARDS AND HAZARDOUS
MATERIALS - Would the project:
a} Create a significant hazard to the public or 0 0 0 ~
the environment through the routine
transport, use, or disposal of hazardous
materials? [32,40,42,43,44]
b} Create a significant hazard to the public or 0 0 0 !(
the environment through reasonably
foreseeable upset and accident conditions
involving the release of hazardous materials
into the environment? [32,40,42,43,44]
c) Emit hazardous emissions or handle 0 0 0- ~
hazardous or acutely hazardous materials,
substances, or waste within one-quarter mile
3-14
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-ca- caca- -
.!!UU .cu -~ .cUU U
ISSUES: _.- ca I- .- ;; n; 0 I--ca o ca
c:= g II) :!:: .- C) Co II) :!:: Co zCo
[and Supporting Information Sources] Q) C E II)C~-~ II) C E E
o~- Q) C) :t:: 0 Q)~- -
D..U) -J- :!Eu -JU)
U) C
-
of an existing or proposed school?
[2,29,30,40,44]
d) Be located on a site which is included on a 0 0 0 '5i
list of hazardous materials sites compiled
pursuant to Govemment Code Section
65962.5 and, as a result, would it create a
significant hazard to the public or the
environment? [2,42,40,43]
e) For a project located within an airport land 0 0 0 ~
use plan or, where such a plan has not been
adopted, within two miles of a public airport
or public use airport, would the project result
in a safety hazard for people residing or
working in the project area? [ ]
f) For a project within the vicinity of a private 0 0 0 ~
- .
airstrip, would the project result in a safety
hazard for people residing or working in the I
project area? [ ]
g) Impair implementation of or physically 0 0 0 ~
interfere with an adopted emergency
response plan or emergency evacuation
plan? [2,32,33,44]
h) Expose people or structures to a 0 0 0 lit
significant risk of loss, injury or death
involving wildland fires, including where
wildlands are adjacent to urbanized areas or
where residences are intermixed with
wildlands?[1,2,44]
VIII. HYDROLOGY AND WATER QUALITY
-- Would the project:
a) Violate any water quality standards or 0 0 0 }[
waste discharge requirements? [20,36,37]
b) Substantially deplete groundwater 0 [j 0 ~
supplies or interfere substantially with
groundwater recharge such that there would
be a net deficit in aquifer volume or a
lowering of the local groundwater table level
(e.g., the production rate of pre-existing
nearby wells would drop to a level
which would not support existing land uses
or planned uses for which permits have been
granted)? [20,36,42]
3-15
>.- C _ 0 C-
-C C C;:: C
-ca- caca oca caca- '0
.!!uU .cu.c-,- .cuU
ISSUES: --a t--_"tiio t-;;::ca o l'lI .
c:!:: m :!:: 'i 0) a. m-a. za.
[and Supporting Information Sources] SCE mC -'- m C E E
o!l!- CD 0) :: 0 CD .2>>- -
D..t/) ...I .- ~ U ...It/)
t/) C
-
c) Substantially alter the existing drainage 0 0 0 )z1
pattern of the site or area, including through
the alteration of the course of a stream or
river, in a manner which would result in
substantial erosion of siltation on- or off-site?
[14, 20.36]
d) Substantially alter the existing drainage 0 0 0 ~
pattern of the site or area. including through
the alteration of the course of a stream or
river. or substantially increase the rate or ,
amount of surface runoff in a manner which
would result in flooding on- or off-site
[20.36,38]
e) Create or contribute runoff water which 0 0 0 ..~
would exceed the capacity of existing or
planned stormwater drainage systems or
provide substantial additional sources of
polluted runoff? [20,36,42]
f) Otherwise substantially degrade water 0 0 0 ,:l
quality? [20.36,37]
! ,
g) Place housing within a 1 OO-year flood 0 0 0 ~
hazard area as mapped on a federal Flood
Hazard Boundary or Flood Insurance Rate
Map or other flood hazard delineation map?
[2,38]
h) Place within a 1 DO-year flood hazard area 0 0 0 .~
structures which would impede or redirect
flood flows? [2.38]
i) Expose people or structures to a significant 0 0 0 }(
risk of loss. injury or death involving flooding.
including flooding as a result of the failure of
a levee or dam? [2,36.38]
j) Inundation by seiche. tsunami, or 0 0 0 ~
mudflow? [2.36.38]
IX. LAND USE AND PLANNING - Would
the project:
a) Physically divide an established 0 0 0 y(
community? [7.12.22.41]
b) Conflict with any applicable land use plan, 0 0 0 )(. I
policy, or regulation of an agency with
3-16
>>- 0 c1:
_c c 1: c :;::
-IG- IG IG 0 IG IGIG- -
.! u u .cu.c-"" .cuu u
ISSUES: -.- ~ ....-_1Go .... ._ IG o IG
c:= U) := 'j en c. U):= c. zc.
[and Supporting Information Sources] CD C E U) C .- "" U) C E E
'0 .2'- CD en :t: 0 CD .~-
..J- :!!:u -
c.en en C ..Jen
-
jurisdiction over the project (including, but
not limited to the general plan, specific plan,
local coastal program, or zoning ordinance)
adopted for the purpose of avoiding or
mitigating an environmental effect?
[1,7,8,16,17,18,44]
c) Conflict with any applicable habitat 0 0 0 Jl
conservation plan or natl,Jral community
conservation plan? [1,5,6,9,26]
X. MINERAL RESOURCES - Would the
project:
a) Result in the loss of availability of a known 0 0 0 ~
mineral resource that would be of value to "
the region and the residents of the state?
[5,10]
b) Result in the loss of availability of a 0 0 0 ~
locally-important mineral resource recovery
site delineated on a local general plan,
specific plan or other land use plan? [5,10]
XI. NOISE - Would the project result in:
a) Exposure of persons to, or generation of, 0 0 0 ~
noise levels in excess of standards
established in the local general plan or noise
ordinance, or applicable standards of other
agencies? [8,18,44]
b) Exposure of persons to or generation of 0 0 0 )(
excessive ground borne vibration or
ground borne noise levels? [8,18,44]
c) A substantial permanent increase in 0 0 0 ~
ambient noise levels in the project vicinity
above levels existing without the project?
[8,18]
d) A substantial temporary Qr periodic 0 0 }ij 0
increase in ambient noise levels in the
project vicinity above levels existing without
the project? [8,18,44]
e) For a project located within an airport land 0 0 0 J!
use plan or, where such a plan has not been
adopted, within two miles of a public airport
or public use airport, would the project
expose people residing or working in the
3-17
~- 0 c-
c- c-
-c caC 0- c
-ca- ,c ca ca caca- -
.! CJ CJ CJ ,c .- ... ,cCJCJ CJ
ISSUES: -ii:~ ....ii:_1io ....._ ca o ca
c_ 11).-.- enQ. II):!:: Q. zQ.
[and Supporting Information Sources] SCE II) C ~._... II)cE E
en :t:: 0
0.2'- ~.- ~CJ G) .2'- -
D..t/) t/) c ..Jt/)
-
project area to excessive noise levels?
[8,18,44]
f) For a project within the vicinity of a private 0 0 0 ~
airstrip, would the project expose people
residing or working in the project area to
excessive noise levels? [8,18]
XII. POPULATION AND HOUSING - Would
the project:
a) Induce substantial population growth in an 0 0 0 ~
area, either directly (for example, by
proposing new homes and businesses) or
indirectly (for example, through extension of
roads or other infrastructure)? [3,16,47,44]
b) Displace substantial numbers of existing 0 0 0 }t\
housing, necessitating the construction of
replacement housing elsewhere? [3,16,44]
c) Displace substantial numbers of people, 0 0 0 ~
necessitating the construction of
replacement housing elsewhere? [3,16,44]
XIII. PUBLIC SERVICES
a) Would the project result in substantial
adverse physical impacts associated with the . .
provision of new or physically altered . .
governmental facilities, need for new or
physically altered governmental facilities, the
construction of which could cause significant
environmental impacts, in order to maintain
acceptable service ratios, response times or
other performance objectives for any of the
public services:
Fire protection? [19,32,44] 0 0 0 ~
Police protection? [33,44] 0 0 0 W
Schools? [29,30,44] 0 0 0 ~
Parks? [5,17,19,21,26.27,44] 0 0 0 ~
Other public facilities? [19,20,44] 0 0 0 ~
XIV. RECREATION -
a) Would the project increase the use of 0 0 0 JilL
existing neighborhood and regional parks or
3-18
~- 0 Cc
-C Cc C;
-ca- caca oca caca- O
.!!UU .cu -... .cUU
ISSUES: -;;:! t-.-;ni 0 t--ca o ca
c_ en := .- en c. en := c. zc.
[and Supporting Information Sources] G) C E en c ~._... en C E E
cLE>> - en :!:: 0 G).E>>-
~.- :eu
D.0 o C -10
-
other recreational facilities such that
substantial physical deterioration of the
facility would occur or be accelerated?
[5,17,19,21,26,27,44]
b) Does the project include recreational 0 0 0 ~
facilities or require the construction or
expansion of recreational facilities which
might have an adverse physical effect on the
environment? [5,44]
XV. TRANSPORTATIONrrRAFFIC--
Would the project:
a) Cause an increase in traffic which is 0 0 0 ~
substantial in relation to the existing traffic
load and capacity of the street system (Le.,
result in a substantial increase in either the
number of vehicle trips, the volume to .,
capacity ratio on roads, or congestion at
intersections)? [4,20,35,44]
b) Exceed, either individually or cumulatively, 0 0 0 fQ
a level of service standard established by the . ,
"
county congestion management agency for !
designated roads or highways? [4,20,44]
c) Result in a change in air traffic patterns, 0 0 0 -Yl
including either an increase in traffic levels or
a change in location that results in
substantial safety risks? [4,?] ,
d) Substantially increase hazards due to a 0 0 0 '~
design feature (e.g., sharp curves or
dangerous intersections) or incompatible
uses (e.g., farm equipment)? [20,35,44]
e) Result in inadequate emergency access? 0 0 0 Jil.
[2,19,32,33.44]
f) Result in inadequate parking capacity? 0 0 0 ':8
[17,44]
g) Conflict with adopted policies, plans, or 0 0 0 A
programs supporting alternative
transportation (e.g., bus turnouts, bicycle
racks)? [4,34]
XVI. UTILITIES AND SERVICE SYSTEMS -
Would the project:
3-19
>>- 0 c-
c- c-
-c ClSC 0- C
-ClS- ..c CIS CIS CIS CIS- -
.!! U U U..c-'" ..cUU U
ISSUES: _.- CIS ~-_1iio ~.- CIS o CIS
c:!:: g en :!: .- OJ Co en:!:: Co zCo
[and Supporting Information Sources] 4) C E en c ~._... en c E E
cL2' - G)OJ ~o 4) .21-
..J- :!Eu
0..U) U) C ..JU)
-
.
a) Exceed wastewater treatment 0 0 0 ~
requirements of the applicable Regional
Water Quality Control Board? [5,22,28,36,44]
b) Require or result in the construction of 0 0 0 tA
new water or wastewater treatment facilities
or expansion of existing facilities, the
construction of which could cause significant
environmental effects? [36,22,28,36]
c) Require or result in the construction of 0 0 0 JSi
new storm water drainage facilities or
expansion of existing facilities, the
construction of which could cause significant
environmental effects? [5,22,28,36,44]
e) Result in a determination by the 0 0 0 ~.
wastewater treatment provider which serves
or may serve the project that it has adequate
capacity to serve the project's projected
demand in addition to the provider's existing
commitments? [5,22,28.36,44]
f) Be served by a landfill with sufficient 0 0 0 )n.
permitted capacity to accommodate the . .
project's solid waste disposal needs? [?]
g) Comply with federal, state, and local 0 0 0 ~
statutes and regulations related to solid ;:
waste? [?]
3-20
a) Does the project have the potential to 0 0 0 ~
degrade the quality of the environment,
substantially reduce the habitat of a fish or
wildlife species, cause a fish or wildlife
population to drop below self-sustaining
levels, threaten to eliminate a plant or animal
community, reduce the number or restrict the
range of a rare or endangered plant or
animal or eliminate important examples of
the major periods of California history or
prehistory? 0
b) Does the project have impacts that are 0 0 0 4
individually limited, but cumulatively
considerable? ("Cumulatively
considerable" means that the incremental
effects of a project are considerable when
viewed in connection with the effects of past
projects, the effects of other current projects,
and the effects of probable future projects)?
0
c) Does the project have environmental 0 0 0 ~
effects which will cause substantial adverse
effects on human beings, either directly or
indirectly? 0
I hereby certify that the information provided in this Initial Study is true and correct to the
best of my knowledge and belief; I certify that I have used proper diligence in responding
accurately to all questions herein, and have consulted appropriate source references
when necessary to ensure full and complete disclosure of relevant environmental data. I
hereby acknowledge than any substantial errors dated within this Initial Study may cause.
delay or discontinuance of related project review procedures, and hereby agree to hold
harmless the City of Cupertino, its staff and authorized agents, from the consequences of
such delay or discontinuance.
Preparer's Signature
Print Preparer's Name
3-21
ENVIRONMENTAL FACTORS POTENTIALLY AFFECTED:
The environmental factors checked below would be potentially affected by this project,
involving at least one impact that is a "Potentially Significant Impact" as indicated by the
checklist on the following pages.
0 Aesthetics 0 Agriculture Resources 0 Air Quality
Ji.. Biological Resources 0 Cultural Resources * Geology /Soils
0 Hazards & Hazardous 0 Hydrology / Water 0 Land Use / Planning
Materials Quality
0 Mineral Resources 0 Noise 0 Population / Housing
0 Public Services 0 Recreation 0 Transportation/Traffic
0 Utilities /.Service 0 Mandatory Findings of
Systems Significance
DETERMINATION:
On the basis of this initial evaluation the Environmental Review Committee (ERC) finds that:
o
The proposed project COULD NOT have a significant effect on the environment, and
a NEGATIVE DECLARATION will be prepared.
Although the proposed project could have a significant effect on the environment,
there will not be a significant effect in this case because revisions in the project have
been made by or agreed to by the project proponent. A MITIGATED NEGATIVE
DECLARATION will be prepared.
The proposed project MAY have a significant effect on the environment, and an
ENVIRONMENTAL IMPACT REPORT is required.
The proposed project MAY have a "potentially significant impacf' or "potentially
significant unless mitigated" impact on the environment, but at least one effect 1) has
been adequately analyzed in an earlier document pursuant to applicable legal
standards, and 2) has been addressed by mitigation measures based on the earlier
analysis as described on attached sheets. An ENVIRONMENTAL IMPACT REPORT
is required, but it must analyze only the effects that remain to be addressed.
Although the proposed project could have a significant effect on the environment,
because all potentially significant effects (a) have been analyzed adequately in an
earlier EIR or NEGATIVE DECLARATION pursuant to applicable standards, and (b)
have been avoided or mitigated pursuant to that earlier EIR or NEGATIVE .
DECLARATION, including revisions or mitigation measures that are imposed upon the
proposed project, nothing further is required.
}\
o
o
o
7 /$t Jo '6
Date / I
711/09,
Date
3-22
CITY OF CUPERTINO
RECOMMENDATION OF ENVIRONMENTAL REVIEW COMMITTEE
Jury 9, 2008
As provided by the Environmental Assessment Procedure, adopted by the City Council
of the City of Cupertino on May 27, 1983, as amended, the following described project
was reviewed by the Environmental Review Committee of the City of Cupertino on
July 9, 2008.
PROTECT DESCRIPTION AND LOCATION
ApplicationNo.:
Applicant:
Location:
EXC-2008-14 (EA-2008-05), TR-2008-05
Amy Cheng
22823 San Juan Road
DISCRETIONARY ACTION REQUEST
Hillside Exception for a new two story, 3304 square foot, single family residence on a
slope greater than 30% and Tree Removal request to remove and replace three specimen
size oak trees.
FINDINGS OF THE ENVIRONMENTAL REVIEW COMMITTEE
The Environmental Review Committee recommends the granting of a Mitigated
Negative Declaration finding that the project is consistent with the General Plan and
has no significant environmental impacts.
The mitigating conditions are identified Residential Hillside Exception Ordinance.
/ s / Steve Piasecki
Steve Piasecki
Director of Community Development
g/ercjREC EA-2008-05
3-23
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@
COLDWELL BAH(ER 41218 723 1950
Eartb investigationS Consultants
January 29. 1999
Job 1507.01.00
P.46
Mr, and Mrs. Leber
343 E.ast Court
San Jose. California 951 '\6
Exhibit A
RE: GEOTECHNICAL 1HveST\GAT10N
. Proposed New House
APN 342.-22-78'
San Juan Road
cuoertlno, CalifornIa
Qear Me and Mrs. Leber:
INTRODUCT10N
b,ocatlon and proiect OesicrioUoU
The site Is loealed on tile downslope side of San Juen Road, northWest of lh..
Intersection with Foolh~16oulevard In Cupertino. Calnorn'" (Plate 1, VIcinity Map.
and Plate 2, Parcel Map). We understand that you propose to construct a two
stol)'. woodcframe \1OUse on the slope downhill from the elOsting street. A
drive\lllay wHl bridge bef.v.Jeen the hous9 and street (Plate 3,Site Plan).
puroose and scaPi: 9f Servlces
The purpose oflhis invesllgellon was to characterize the geologic and foundation
sonS. and to provIde geotechnlcal parameters for the proposed residential
construction. This follows. the geologic review conducted by Cotton.. Shires
Associates (1998). The scope of ser'Jlces undertaken to arrive at the findings, .
c<1nclusions and recommendations in this report lncluded the following:
. Rev,ew of pertinent geologlca\ maps and ~~terat\Jre pertaining to the. site
area.
.... _ .. RevIew of a 1964 black and white, vertical stereo photographic model of
the site area,
. Site obselVations conducted on December 1 a, 1998.
Geotogliite" EnBIn.ear.
505. T..nIU!1 A~... Slllla lO e.-oO Boll. 6'7S . Bd."aD.. CA 94005. (415) 467-'645 · I"A)C.(.15~ 467~1107
3-24
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COLD...JELL ERNKER
408 723 195e P.47
January 29,1998
Page 2
Mr. and Mrs. Leber
Job 1507,01.00
.. Site exp\oratlans by advancing 2 bor\ngs in the proposed building area
and 1 on the roadway uphill of the propos~d house (Plate 3). ?olls
encountered on the slope in the proposed bui\d~ng area were sampled by
advancing a 1 Ya tnch diameter, spilt spoon sampler with a gas powered
Wacker (BHF 308) percussion hammer'tha.t Imparts an axial load of.35 ft.
\bEL totha sampler at a rate of 1270 blows per minute. The bating on the
roadway was advanced. by a truck-mounted, CME55 flight auger. 1he
borings were logged and sampled by our field engineer. The Lags of
Borings are contained on Plates 5 and 6. Plates 7 and 8 contain the terms
. and symbols. ~sed on the logs.
,
. Geotechnical ana\ysisaf the data.
. Preparation of this raport.
. er~vlous Work
The-reglona' geologic setting for.this area 1S Contained In Rodgers and WiUlams
(1974; Plate 4, Geologic Map). sorgand McLaughlin (1975) also descrtbe the
geolo~lc setting of this part of Santa Clara County and they define the trace of
the Sargent-Berrocalfault '(Including the Monte Vista zone) along the mouf1tai~
front.
Francis A. steler (1978) prepared a.geologlc reconnaissance letter report for the
site and adjoining property to th~ west. It indicates that the site is underlain by
Santa Clara formatIon. ve.ry near the Monte. Vista fault, which he considered
potentially active. Ttle site was not reported to have "unique" geotogic or seismic
condItions that would preclude residential development.
Nearby geotechnlcal investIgations provide additional details of the loea' geolawc
setting. Cle.ary Consultants, Inc. (1992) conducted a subsurface, geologiC
investlgatlon for the existing house 0f1 the east side of the site (22801 San Juan
Road i plate 2) and reported 3 feet of displacement in Santa Clara formation
across a steep, northeast dipping (out of slope) normal fault (1andslide rupture
surface?); Presence of the Motlta V\sta fault was inconclusjve. They
recommended a 15..foot bu\\dlng setback ftom the trace of the rupture surface
they mapped near the north side of that site.
Terratech, Inc. (1998) performed a fault investigation on the property across the
street from the site (22820 San Juan Road) and found intact Santa Clara
formatIon sandston~ and siltstone Intercalated wIth \ight...colored and fossinferQus,
lacustrine deposits dipping moderately to steep'IY to the southwest.
.. .
Earth InvestigatiODs Cons~ltant9.
..~~, .
3-25
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COL t::A.JELLBflNKER
408 723 1950
January 29.1998
Page 3
P.48
Mr. and Mrs. Leber
Job 1507.01 .00
We have performed resldentlal geotechnical investigations on properties
sun:oundlng the site. as far northeast as 22765 San Juan Road. and found intact,
Santa Clara formation bedrock dipplng steeply to the southwest (Earth
~nvestlgatlOns Consultants, 1.995: 1S98a & b). GIven the presence of only Santa
Clara formation, we conduded that the trace of the Manta Vista fault is farther to
the northeast than depicted ort the City geologic map.
GEOLOGIC SETTING
The site is situate~ on a steep, dIssected northeast-facing h\1ls1de fO\11ling the
easteny margin of the Cupertino foothmS. This region is drained eastward by
ephemeral channels tributary to Stevens Creek. .
This. part of the foothills terrain is I.Jnderta\n by nearly 3000 feet of late 1 ertiary~
early Quaternary Santa Clara formation (Dibbles, 1966). It is described as
samiconsolidated, terrestrial gravels. sands, silts and clays. Dibblee (1966)
. descr1bed intercalated. light srayClay lake depasitsconta\ning minute. fresh-
water mollusks In the\ower part of the type section near Stevens Creek.
Near the base of the foo th iUs , just northeaet of the s\te, Santa Clara formatiOfl
has been mapped In contact across the Monta V1sta fault wittl older Monterey
Shale (fig. 1; D\bb\ee, 1966; $or9 and McLaughlin, 1 975~ CIty of Cupertlna,
1998). This bedroCK formation is described as approximately 2000 feet of dark
brown soft. flssile, marine, diatomaceous clay shale, mudstone and siltstone and
hard, sem\smceous shale containing hard calcareous beds. The presence of this
formation Is distinctive in the fleld .owing to weathering tha.t bleaches bedrock.
outcrops and clasts In colluvium to tight_grey and white.
The distinct. northwest-trending structural grain In the site area \5 the result of
regional, tectonic defOrmation across the active San Andreas fault, mapped
approxlmately 3 1/3 miles to the southwest, and the subsidiary, potentiC;lUy active
Bermeal and Monta V\sta faults, mapped appr(Jximately 1 mile and appro:dmately
200 feet to the northeast, respectively. The San Andreas fault has a
predominant right.latera\ strikE) slip sense of movement whUe the Sargent and
Monta . Vista faults have right~lateral strike slip and thrust components of
movement.
Dibblee (1966) mapped a series of northwest trending, southwe5t plunging fotds
In the santa Clara formBtion~ that are bel\eved to be the result of drag across the
S~nta Andreas and PUarcltos faults. The site plot~ on the northeast limb of a
broad synclinal fold where beds measured by Oibb'ee (1966) dip moderately to
. the southwest. Terratech (1998) and local bedding att\tudes acquired near the
I'
Earth Invf!Stlgations COD&ultal1te
3-26
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ca...DWELL BANKER
408 723 1950
January 29. 1998
Page 4
P.49
Mr. and Mrs. Leber
Job 1507.01.00
site for this In,esligation re,ealed that strata comprising the Santa Clara
formation near \I1e site dip steeply to. tne sou\nwesf, Into t\le slope (Plate \).
'There are no mapped landslides or active fau\ts acroSS the site.
I ir
Figure 1, Local geologIc map (after City of Cupertino, 1998).
o b~l~
A'P"'IG~~ ""ale
.SEISMICITY
,- .
The faults described above are the principal seismic sources that would affect
the site over the next qO years (eoonomlc life of res\dentla1 de'llelopments). Table
1 identiflesthe faults and their earthquake characteristics. Tab\e 2.deflnes the
st1ticipsted ground shaking response at the site during a malor earthquake on
one of the Bay area 'faults. Including the .East Bay Hayward and calaveras faults
mapped approl<lmatelY 10 and \4 mRee to the northeast, respectively. Figure 2
U\ustrates the relative distribution of ground shaking intensity given a major
earthquake on the Monta V\sta fault Table 3 describes the shaking 'ntensi\y
values wIth respect to building damage. Peak. ground acceleration was derived
from Campbell (198'\ ),based upon the distance from the 811:9 to the potential
seIsmic source. Repeatable. t1Orizonta\ ground acce\era\ion vs\ues are taken as
2/3 of the peak value as described by Plos~el and S\osson (1974). It should be
understood that these values are estimated. and that shaking during a nearby
mslorearthquak.e could be more severe th~n the historic data reflects.
Earth luvestigatloDS Cona~dht.nt.
3-27
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Cl::U)WELL BANKffi
408 723 195121
January 29, 1998
Page 5
P.50
Mr. and Mrs. Leber
Job 1507.01.00
TABLE 1.
C8U1Iative App(oxlmaW Maximum Max\m'-lm Eat. Reeurrenc..
Faults Dl5tal1~ "lslotte Qu.1ce probable Q\I.iall (nterv.1 ot Max. Prob.
From SIte Megnftuda fAagntwds Earthqusk.
S~ Ao(tnIas 3.3 Mlle. &.3 (A\t.:httll) 8.3 (RIehle r) 50-100 YiAt$
(La-st eVfl-nt 1 Q06)
San
AndrlPS Hayward 10 MIIl'JS 7.0. ~Rlchtllr) 7,0;- (RiChter) 10-100 '(ears
System (Last 8".nt 1 a6S)
Calave.ta5 14 Miles 6.Dt (Richter) 7.()+ (Richter) 10-100 YBi1J'3
Sargent- ~rrocal 1 Mil. 3.7-5.0 (Richter) . 6.5-r.0 (AlcI1tOr) Insufflcten\ 0$
aerrocal
systJJm Menta Vista 2011 feot 2.0..3.0 (Rlcht9t) ~.5-7.0 (Rlclhter) Il'Isufflcie1'1t Data
Active arid Potentially Active Faults and Their Earthquake
Characletistics.
TABLE 2. Anticlpated peak and repeatable ground shaking during a maior. toeal
earthauake.
Seism;c: Source Max. Probable . Peak Horizontal
(fault) RIchter Mag. Ground Aecet
San Andreas 8.3 O.6g
Hayward 7+ 0.2g
Calaveras 7+ 0.2g
Serrocal 6.5+ 0.69
Monta Vista 6.5+ 0.7g
Sources: City of Cupertino (1998); Maulchin and Jones (1992)
Repeatable Horiz.
Ground Accet.
0.49
0.19
0.19
0.49
0.59
,
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408 723 1950
JanUary 'lid, 1 \1~Q
. Page 7
Mr. and Mrs. Leber
Job 1507.01.00
Table 3. Earthquake shaking \ntensities (from City of Cupertino. 1998).
&rthquua RlotrtDr p,!Cldltlcd "tttcalllntensiLy $cal.- Dllm...gll TI;I
C;atlilCJary Mag. structure
DeleaWd o"ly rr, SlllnllitNe In&V\JrnGnla
Z.OO II Felt by faW perSOns at rast. as~. an uppar lIoor!J:
l:Selicatlll suspended objects may sw1nQ
III fait notl~.lIIbly lndccnl but not llIW8ys rBcognlzscl i:I,S No
~.Oo IU1 nrthqu:a,lCe; standtng C8l':I rook sl~V, v1bra.l1Q.f'1 O8ITIllga
like pualng !~
MInor
,. tV F1t~t jndOOf'S by many. outdoors bY a. flIw; at night.
soma awaMl\; dlllhes, wlndo'l/I. doOI"S dt.\urt:lGd;
oafS roc!< no\iceably
4.00
V Felt by most peQpte: tOnle brflallAge at dlShltS, /\td1ltl~n11
windows lU'Id plaster; dt5tuttlal'lCII \Q taR objacts o.mllgll
VI Felt 'Uy all; many atel frlght.Mad and Nil o\!ldoors:
rallltag pllJ9tar aM chktU\ey.~ dama/1- small
.ft.OQ
$.3 VII !!verybady runs autdOO.... Oamage to boi\dll'1g!l vBrles
d.~ndlng en quality of CQ1'llitr\JC1lQni noticed by
drivers ot c::aa
Mod6l'atB &.00 VI1l Pansl wJlla 1I'1.tMI1 aut oIfrvnesj walts,
mon1JfTl.nU and ehimnllYS fa11~ 1I11l'lQ al'\dm~d .jactllld;
driV8t'S at t:8.r.I disturbed.
5llUCturel
B.1l IX . Buildlng shiltGd aft fo~l'!datlQna. cracked. 1hl'OWO Damaglll
out 0. ))lumb; grwnd cl'$c\l;Gd, UndGfgro1.mO t1lpl!lS
broken, $oricllrs damage to merWlrslerrtbankmlilnt&
Major 1.00 X Most maSOn rf ."d frame sUlJOMM de'1rO'(~
gl'Qund ~racked: ralls bant sIlgt'ltly; landslldfi
7.7 XI few s\NCtutat I1JCl'I4Jn sta/1dlng: btldgeG dN\r~d:
!l"fNf1I!lln gro~d: pipa brolr:.m 11ind$ltdtlr, rails
bent To~
08&wotl.on
GrBat 6.00 XU O&ma9G total: ~avas seen <lf1.g~und ..uriBee; IInM 01
slQht and '-oJ,1 cIlaw".d: obledtl thrown IntQ the alr.
larga rod< r1lQUl3IS d1:SPlac;ed
. Subj4lctivl!l lTIelU\lre of 9round ahalC.ln~ not IlInginll&ring ~&Sura 01 grourd ~al.t8llQn
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408 723 1950
January 29 I 1998
Page 8
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Job 1507.01 .00
SlTE. CHARACTERISTICS
Surface Features
The south margin of the site slopes steeply downward acrose the embankment
formed by the east ~g9of San Juan Road (Plate 3). The road pavement at the
tap of the slope contains an array of cracks l11dlcaUva of settlement and lateral
creep of the fill.
Downhill from the roadway embankment. the natural terrain of the ridge slopes
steeply tolhe northern property line.. Tolal relief across the. site is approximately
75 feet. The top ofa wall-suPported cut slope extends from the neighboring
residence to near the east side of the proposed house.
The parcells covered by a relatively dense stand aT oak. trees and understory of
vines and grasses. Runoff.sheets to the northeast. Some runoff sheets from the
street across the site as suggested by a \lne of sandbags present at the edge of
the roadway during our site investigation.
The site is mantled by roadway fill at the top, and colluvium acrosS the rest of the
slte. Bedrock waS not exposed on the surface.
Surface evidence of seepage or springs was absent.
"
'.
There was geomorphic evIdence of a previous1 snallow debris slide across the
middle of the parcel. It appears that this feature Is related to runoff entering the
site In the past from the street. .
. There was no geomorphic evidence of deep-seated bedrock lands\;des or active
faults en the site.
Explorations
Three borings were advanced to characterize the site solis and bedrock. Boring
1, in the uppe(part ofthe proposed building area encountered approximatelY 1 "h
feet of firm. darK yellowish brown sandy clay colluvium overlying weak and
weathered claystone arid slltst-one of the Santa Clara formation. .
Soring 2, just downhlll from Boring 1, encountered approximate'Y 2 Va feet of 50ft
to firrr".. plastic. sandy clay eo\luvium (Plate 9, plasticity Chart). Sandstone of the
Santa Clara formation was encountered beneath the colluvlum.
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Boring 3 was advanced at an accesslb1e location at the edge of the roadway
pavement at the top of the slope. \t encountered approximately 5 feet of loose to
medium dense, silty sand fin overlying approximately 3 fea1 of stiff. sandy clay
colluvium. The colluvium rested on Interbedded clayey sandstone and siltstone.
Plate 10 depicts a cross section through the proposed building area.
Ground water was absent. The solis encountered were damp.
DISCUSSION AND CONCLUS10NS
The results of this investigation indicate that the proposed residential structure is .
feasible from a geotechnical standpoint. Our Investigation indIcates that the site
is not crossed by the trace of the Monte Vista fault. Previous work by Clearly
Consultants (1992), Terratech (1998) and our investigation of the site at 22765
San Joan Road, where only Santa Clara formatIon was encountered, Indlcates
that the trace of the fault is located farther to the northeast than CU(fently
depicted on the. City geologic map. Hence, the site is not constrained. by
potential ground rupture from the Monta Vista fault.
The primary conslderations for development on the site Include strong seIsmic
shakingdunng a future major earthquake, potentially unstable roadway flll,
. expansive soils and control of drainage on steeply sloping terrain. In our opinion,
these consideratlons can be mitigated and the site safely developed through
prudent engineering design and strict adherence to the recommendations that .
foUaw,
in our opinion, the proposed residence. garage, and any decKS and retaining
walls should be supported on drilled piers that are interconnected with grade
beams.. We anticipate little grad\ng, but the bridge to extend from the edge ofihe
street to the garage will probably require retaIning wall support. To enhance
stability of the steep, unenglneared fill stope uphill of the house. we ha'We
recommended that the driveway bridge be integrated with a series of "stitch
piers" to en.hance lateral stability of the slope across the uphill side of the
proposed structure. As much as practical, the proposed development should
drain to the street.
Earth lnvestigation. Coiaaolt.ntta
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January 29,1998
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RECOMMENDATIONS
Site Preparation. Gradlnq and Compaction
We anticipa.te tl1atgrading for this pro;ect will be mInimal. and only to the extent
of clearing the building footprInt as described herein. If the final design calls for
. engineered slopes, it Is irnpart~ntthat you contact this office for supplemental
recommendations.
Grading should be performed in th~ dry months. Due to the relatively granl!l~ar
nature of the site material, It can be used as a source for engineered fil1provided
it contains le$s than 5 percent organic and negligible constructiOn debrIs, as
determ\ned by the field engineer during construction. If import fill is reqUired to
establish the proposed driveway bridge between the street and garage, it should
be non-expansive with a plasticity Index of 12 or less. The building site and
driveway should be graded toa.chieve positive flow of runOff away from the
foundations. .
.,.'
Areas to be deve'oped should be stripped of an vegetation and organic material.
Stripping depths should be tletermlned 1n the fleld at the time of construction. but
for planning purposes an average stripping depth of 3 to 4 Inches may be
assumed. Strlppings may be stockpiled for subsequent use in landscaping.
To prepBre the slope for nawfllt at 'he driveway transition, the existing fi\1 should
be overexcavated toa depth of 2 feet, moisture-cond\tlaned to near optimum,
and then compacted to 90 percent of the maxImum dry density of the materials
as determinad by the ASTM 01557 (latest edition) laboratory compaction test
procedure, The new fill behInd the bridge abutment should be spread In 6- to 8-
inch thiCK. loose lIfts, moisture-conditioned lonear opt1mum moisture content.
and compacted to . at least 95 percent relative compaction. Optlonally, the
abutment can be backfiUed wlth 3.h to 1 ~ lnch crushed rock that Is integrated with
the abutment w~1 bacKdralnage system. Place filter fabric between the crushed
rock and aggregate base for pavement section. .
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January 29, 1998
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UtllitvTrenches
Vertiqal trench excavations up to 5 feet deep should be capable of standing with
minimal bracing for short construction periods. However. contractors should be
a\ert to potential unstable conditions. Local conditions may require that trenches
less than 5 feet be cut and braced as specifled in the State of Ca\1fomia Safety
Ordinance dealing with Excavations and Trenches.
Utility tret1ches should be designed to prevent the transportation of water into
foundation soils~ Cars should be takan to assure that uncontrolled, concentrated
runoff Is not conducted. toward the slopes. 111 particular, where utllltles cross
foundations. trenct'\es shouid be plugged with compacted soil or concrete fortheir
full depth, and for a distance of at least 2 feet on either side of the fo'undatlons.
On~slte, inorganic soil may be used as utility trench backfill. Special compactiorl
of trench backfill wIU be necessary under and ad]~cent to the. proposed
structures, concrete slabs, and engineered fH1.ln thesaareas. backfiUshould be
conditioned with water to produce a sol\-water content near the. optimum value,
and placed In horlzontal layers, each not exceeding 6 inches in loose thickness.
Each layer should be compacted to a density equivalent to at teast 90 percent of
the maxlnium d.ry density of the soil as determIned by ASTM test 01557. The
tap MO feet of trench backfiHunder slabs and pavements should consist of nQn-
expansive, granular soils compacted to at least 95 percent of maximum dry
density.
Foundations
Thi:3 proposed house. garage and all deck foundations should gain s\.lpport rrom
the stiff 5011 arid bedrock by drilled piers that are interconnected with grade
beam5. Isolated piers ~hould be avblded I .
. Drilled. cast-in-place concrete piers to support the house a.nd garage
should be at least .!~~~h~s.J~ dl~!!,_~!!",.~~d e~J~_mL~!~.~j!..10.J!..E:!
Into bedrocK as J).ssat(iijQ 5v Ul.i. 9-eoT~cnmcal consultant In the field
dunngdnllmg:-We recommend that theprerlOuna~lioii be designed
for an allowable skin friction value of 40QJ1Q!!nds per square foot (ps!)
beginning at a depth l.lf3 feet beloW1hi gr~nCl @l1Ei~e:-~n(rneanng
of piers shoutd be neglected In desigl1 oecause of the difficulty in
cleaning out smatt diameter holes. Th~~!1. fdgtjQn...v.ah.l.J3 ~shauld.~~.
Increased by 1 f:u.~3!.<?-qQY!1tfQLWrui.aru1.~~~~mt~..!Qe9.!. The overlying
~td1:r9aS5umed to impose a lateral creep load of 60 pet acting
~~~!.1Y~~L~~rr!~~~~~..._ ---. ."
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January 29,1998
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.. The portion of thep\ers below a depth of 3 feet shoUI~_a9~goed-fGj:--'
a~$..sl\t.e,.eQ~ ivat'ent-fluid..pressure...of ..3.5(f peut1ds~er.cub.J.cJgQ1....{pci)...~-<-'
acting over ..k-...pi.er-d1ame~. To account for potentlal uplift, we
recomi1'le'f1O that the piers be designed to resist an uplift force of 350
psfi["1.the "uppeL3J~,e.tof...sQlt
. Perimeter and interior piers should be.tnt~rconnected by grade beams
to avoid potential problems associated with ;solated piers In slOping,
expansive soils and In seismIcally active areas. To prevent uplift on
th~~".b.9JtQ.ro_.of-..t~e..gr.aq~_.~~.~!:".~J_!L~.4d.nch. vqld ~nq~.J!Ia ln~ined
t'5etweef1_tt)~.~9!1~rui.9E~nL<?lth~.9.!'.m1t} beams... This can be achieved
by 'r~~~~I~.t!~_'!-.C?L9~1I~Sibl~ carq~ materi~!J2,smea~_J
the grade~amL- Styrofoam is not' recommended unless the.
manufaCtiJre-i guarantees collapse under conditions of horizontal
confinement.
. It has been our experience that pot~ntia.~J!~~ ~r!~l~.!~JL~?~~~tl.:ms may
be mat In the unge.nying bedroCk.. Rence, It 15 Important tffanfte
foundation contractor bEi'pn~pa-fe(rbY employing drilling equipment with
a~t5L:'Q.owr\ pr~~sure" and ~l.lli?Eed with rock bits.
--.......-..-..- -...-.-__.....:"..-.-~..- ~ ...~--------_.-
In the event ground water is encountered In the pier holes, it may be necessary
to remove standing water by the tremle method. If pier holes cave. it 'NlIl be
necessary to install casing to maintain the holes open until concrete is placed.
Retaining Walls
Retain1ng walls1lncludlng the driveway bridge abutment adjoining the. street,
should be supported on grme~Lpiets as seecified above, and designed to resist
an active equivalent fluid 'Pr.~.!i~~[! of ..9..Q....E.:! acting In a triangular pressure
distribution fo(l~vel baamfL Whe~eb.,9~n~L.~~~p to 2:1 \fl~~ the wcdis
should be deSigned for ~n active eqUivalent fJ.~~~~~~l!r1L-g[" IO pet.
Intermediate values can be obtained by interpo\atlon. WallS supporting tfi'e'"
driveway should be designed for an appropriate surcharge to account 'for
anticipated vehIcular traffic lo~ds.Any wall tnmJs restrai~9J!9Jn.[Q!~!lQ~~Ol:!.~~~
be designed to resist an ~dltionaLunUorm pressure of1Cio psf. .
- ----- -~-..~ .
----~
Retaining walls should be ful\y backdrained. The backdralns should consist of
e!ther a geosynthetlc drainage m'iilt..9.,MIr!!!t~..5QQ.t[.oi..~uiVar~!J!t.2r a4-inQ!L..
..' ~~dlamatar, hlghcruJ!hJ.tr.~gth 2![fQriiTia:J:&'.c;..~slqQet;!Jg,]Ir~nJ.2.~~QY.
~ and'"OTCle'!!J.Jre~.2~ni'l9-_~ If the crushed roCk or
9 alternati\le is chosen. It should be at 'east 12 Inches wide and extend to
within 1 foot of the surface. Th.~ .!:IP..P..~Lf.Qg,L$J1QI.IJQJ2!U?~Ck~1l~.d...Wlb_~ct3d-
soU to exclude surface water. Drainrock should be separated from tl1e soil by
~-_.-.--,----_._--~.~--
Earth Investigations Con.uJtallt&
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408 723 1950
January 2~, 1~'dts
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Job 1507.01.00
ft Iter fabric. ClassJ~,,!?~_G:n~a~\~fil~!..!!l2}~I~!. ~~~,.?~.t.lJ29.J.fl !i~l.L_cf..dr:ainr.oQ,~9..
fllte~ ~aifllng waTr15aCkdra\nage should be directed to the protected
STOpe downhllt from the site.
Retaining walls should be thoroughly waterproofed to prevent detrimental
migration of moisture. Retaining walls will yield slightly during backfilling.
Therefore, they should be b~.s.\gillect.P.n9..L~'?..~11~9.~~~~~!_~~.:..~~.!.~~~
\ .
We recommend that the ground surface behind retaining walls be sloped to drain
in a positive manner so that pondlngand erosion does not occur. Open, lined
9~_QL~fuLI;l~~ouW~gc:u~.!~j!ce_Dd..'l~~t!!~'TIJ?_~~I}J!lt!}-~~~.~~'"!!J1~.-E
~~~~.Jl. u""ar no Circumstances sh<>uld \l1a su, ,ace water be
oiverted into subdr3(na.
Stitch Pier$
We recommend that the late,ral stability of the fill at the top of the slope be
improved by installation ora rovt of ~inf~~1 .S.2.nc~~.'pj~!-~....s!~.9!!~!i..lf\
accordance with the reco men ations for foundatIon pTers. The piers should be
spaced. no farther aQart th~JJ",i.~~<me!t~~ e.~~_t(.L~2S~J. They should be
lpcated In a line par@terl~~ ~Q~JUlP.!9XI~~~!i', 1!~,~9.lJ..~J1l~teng~frq1Jl_!'2e
top to the toe ~fjTr~ilitl~"Qm~~~yg!L..Flate 10) and should extend a1
~3sI~tl'li~~~.~_~..!li.~.]QY.~.~!.9,g!g.W!J.L. 8..Y.9. nd....Jhl!~c:!rt~~. s. y... T. he to...ps ~.!...PJ~~
should be int~<iOn~~,Wjtb..a~g.rade.J)j!!U:L9.!~1~Ul~~f1tl~._,p.!9.1~ct engineer for
~~~~.QJoad.ol'&"QJ~!?!ln~t WjJl~~~..~Q.il.Q..y~.r!y,!nJa. .~mQ~. S!!!~~_
piers should extend at least 10 feet Into bedrock.
....!"'__..~~.................t:..-- ,...,~ .'-:_......_.....~'~ .....~~~.~~.._......,.. __..~~. ~,. ...;~t.-...... ,...: ..<!":...-:"..-....I..-CO..-.. -,..-....... ..\....."rt..-.....
Slabs-on-Grade.
We recommend that the ItVing~~...Q.~slgned with raised wood floors. We
anticipate that framing will support the garage slab. ~ .~ -
........ ................~---..
.eavemoo1
Prior to placing the driveway pavement sectlon,~he existing flU proposed for
support should be ~~~at~~!:.gL~!Jeast r21~et (tQ be confirmed In
the field by our representative.). Ncn~.!O..s'~!l!.!J9.u...a~tJ;t~~jQ~.~,J~9~
should be laId...]" ~:jJ ..E .lncl1...lo9!6 t11ts on.!.(?-.~_E~cb ,cut il'Jto .~
eXTsnng1m"6f"colruvium. "111e new fills should be compacted to at lest 90 Eercant
reratly~~.J!I.Ragi9n__.~ffljrbringing It to near optlmum moistufiCOntenC'-We
recommend that asphar(~pavemer'itS'"-'cofiSis1-6-r"a-~ff-lncfi'-~iecti6n-OraSigr~a~~
...ba=~_~~_,.~.~P~~~2.,_!9_...~_~L..Q~r2~~__~!'2_~-~~jIJ.9h~..QtF~!!; . Concrete
Eal'th InvestJgt'lUons ConS1.Jltants
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January 29, 1998
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0....> COLDWELL BANKER
pavement should be at lef!.~4...lo.ct.1aslhiclLan~tQ!9Yjst~d..with_conSlnJ~ti.9~.J?,lnts
and minimum N~,:_~{Qmit\g~s.~tillQJ!]~~,~~~~':'.,_ '
Oraina~
It Is important thattne site be deslgned .so that street runoff does not enter the
driveway or sloping terrain of the site. In designing site drainage., it would be
optimum to have the drIveway surface and house roof gutter system drain to tile
street. If it Is lmpractlcal for the driveway to slope toward the street, then it wUl be
necessary to insta\l proper suriace dratnage controls n.ear the driveway/garage
slab Interface to prevent water from entering the garage. Water would then need
to be carried in solid PVg,..tQ.~n erosion-controlled discharge poInt downhU1 of the
ho use, 1:--'--" <'*-"~.,.-<~--,..,.~.~...._.~~~,,...-'-~--..." .-"
The ground surface adjoining foundations should have p03i~~~._~~,1!~c..e drcaloage
gradients of _l?,tJ~.!;!~Ll.P.~r.9_?JltJQ.L~....s:tt~..an.c~."Pf. atleast.JLf!a~t To reduce
seepage"rnto the foundation area, we recommend that a fovndatlon drain be
installed on the uphill side of the house. (If the uph'" side of the house is a
foundation wall, a separate foundation drain is unnecessary provided the
backdrain subdrain pipe is seated at least 12 inches below the crawl space
eh:~vatlon). -- The trench should be faced with. filter fabric. A minimum 3..inch
diameter perforated, Schedule 40 (or approved alternate) dralnplpe~ laid hotes
down-. sho.uld be placed at the bottom ofthe trench wlth a minImum slopa of 2
percent to drain by gravity. The trench should then be filled to with'" 6 Inches of .
the surface with 3,4- to 1 ~ -inch drainrock. Placefllter fabric over the top of the
drainrock and flU the balance of the trench with drainrock or decorative cobbles. .
sediment that accumulates on thl;J top of the filter fabric shoutd be cleared
periodiCally. Attamatively, the upper 6 inches of ttle foundation subdrain can be
capped with compacted site soil provided the finished ground surface slopes at
least 5 percent away from the foundations. Once the foundation dra;n has
reached an .srea on the sIdes of the building where there Is positive slope away
from the foundatIon, the subdrain can be connected to an equivalent size solid
pipe that carnes water by gravIty to an approved discharge point downhlll from
. the house. We antlcipate that discharge of sIte drainage, If not at the street, wi\!
be on an erosion resistant surface no closer than 10 feet frorn the downslope
property line. .
We recommend that site d-ra\nage be dispersed onto erosion protected surfaces
attwa locations on. either downslope side of the building area~ CleanoutB should
be pravldedfor the subdraln and solid outfall line where bends exceed 45
degrees and to break runs into, maximum 50-foot lengths. _--...---
/
Earth IDvestigations ConllUltants
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January 29, 199t:J
Page 15,.
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Job 1507.01.00
Areas where foundation subdralnl;lge is not feasible should be provided wittl a
well-delJeloped surface dra.inage system consisting of minimum .12-1nch square
catch basins seated in concentric depressions formed in the adjoining soil. ,he
outer margin of each depression should be located at least 3 Inches higher than
the catch basin rimalevation so that positl\l9 sheet flow to the inlet is maintained.
MAiNTENANCe
Periodic land maintenance may be required. Surface and subsurface drainage
facilitles should be check.ed frequently, and cleaned and malntained as
necessary. It will tie partIcularly Important to maintain the concrete gutter located
downhiU of tne house.
fNVEST1GAT10N LlMtT AllONS
This report has been prepared In accordance with generally accepted
geotechnical engineerlng princlplesBnd practices, and is in accordance with the
standards and practices' set by the geotechnical consultants in the area. Ttlis
a.cknowledgment is in lieu of any warranty. We offer no guarantees.
Subsurface conditions could vary between those Ind1cated oy the explorations
and interpreted from surface features. A qualiiied geotechnIcal consultant should
be retained to provide construction observation setvlces. to observe the exposed
geotechnIcal yonditions, to modify recommendations. if necessary, and to
ascertain that . the ,project is constructed In accordance with the
recommendations. '.
This report is submitted with the understanding that it is the responsibility of the
Client (Owner) to ensure that tne applicable provisions of the recommendations
contained heretn are made known to all design prOfessionals Involved with the
project; that the recommendations are Incorporated into the construction
drawings; and that the necessacy steps are taken to see that the contractor and.
subcontracto1's carry out the recommendations in the field.
If conditions different from those described In this report are encountered during
construction. or if the project is revised, we should be notified immediately 80 that
_' we may modify our recommendations, if warranted.
The practice of geotechnical engineering 'changes, and, therefore, we should be
consulted to update tnis report if construction Is not performed within 12 months.
Eartblnvestigations CODsdltaots
.
.
::: .
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p.22
Mr. and Mrs. Leber
Job 15D7.01.00
400 723 1950
January 29, 1998
Page 16
P.E.1
AUG-15-2007 16:05 COLDWELL BANKER
REFERENCES CITED
Campbell, K.W., 1981, Near-source attenuation of peak horizontal ground
acceleration: Bulletin of the Seismolog\calSoclety of America. v. 71 r p. 2039-
2070.
City of Cupertino. 1998, General plan, public health and safety: Section 6, pgs.
6-1 througtl 6-t4. .
Cleary consultants. Inc., 1992. Fault investigation. 22801 san Juan Road,
. Cupertino, CaliforT1la:Geotechnical consultant's AprU 24 report to Barry Barns,
Job 729.1.
Cotton, Shires and Associates. 1998, Geologicrevicw, proposed residence, APN
342-22-077, San Juan Road, Cupertino, Callfornia: Geotechnical consultant's
May 28 letter to City of Cupertino City Planner, Job C3018.
OibbJee, T.W., Jr., 19661 Ge.ologyof the Palo Alto quadrangle, Santa CI3ra and
San Mateo' COl.1nties, California: Ca1ifbrnla Division of Mines and Geology Map
Sheet B. sct11e 1 :62,500.
Earth Investigations Consultants,1995. Geotechnical investigation. proposed
house. 22830 San Juan Road, Cupertino, Califomla~ Geotechnical consultant's
March 7 report to Dr. Cary Queen.
..,
I 1999a. Geotechnical investigation. proposoo resIdence, APN 342-22:..77,
San Juan Road, cupertlno, California: Geotechn;cal consultant's January 26,
1998 report to Mr. Derek Fluker, 16 pgs.. Job 1507.01.00.
. .1999b, <3eotechnlcallnvestlgatlon, proposed residence, 22765 San Juan
Road,. Cupertino, California: GeoteChnical consultant's January 26 report to
Naslm Nehawandian. Job 1507.03.00. .
Mualchin, Lalltana and Jones, A.L. 1992, Peak acceleratlon from maximum
credible earthquakeS In CalifornIa (rock and stiff soil sites): California Division of
MInes and Geology Open Fil.Ei Report 92-1, 53 pgs.
Plo5sel, M.R., and Siosson, J.E., 1974, Repeatable high ground accelerations
from earthquaKes: Callfoq11a Geology. Califom,a DivisIon of Mines and Geology,
V. 27, no. 9, pgs. 195-199. .
Rogers, T.H. and WIlliams, J.W., 1974. Potential seismic hazards in Santa Clara
county, California: Canfomla DivisIon of Mines and Geology Special Report 107,
map scale 1 :62500. .
Earth lnve$t1gattons cOllsultants
3-39
Dee 11 2007 10:48PM P LASERJET FAX
1234567
AUG-15-2007 16:06 COLDWELL BANKER
408 723 1950
Mr. and Mrs. Leber
Job 1507.01.00
January 29,1998
Page 17
/
Sorg, D.H.. and Mclaughlin, R.J., 1975. Geologic map of the Sargent-Bermeal
fault between Los Gatos and los Alto Hills, Santa Clara County, California: U.S.
Geological Survey Map, scale 1 :24,000.
Steier, F.A., 1976. Engineering geologic study, Lots 402 and 403, Inspiration
Heights Monte Vista: Geotechnical' consultant's June 9 report to Barnes,
Fontaine Development Company, no Job no.
Terratech, Inc. 1998, CombIned geology, fau~t and geotechnical Investigation,
Hutton residence, 22820 San Juan Road, Cupertino, Califomla: Geotechnical
consultant's May 12 report to Mr. and Mrs. Hutton, Job 101254.
The following plates are attached and complete this report:
Plate 1. Vicinity Map
Plate 2 _ Parcel Map (with Manta V1sta fault transferred from ~he City of
Cupertino (1998)
Plate 3.:. Site Plan
Plate 4 - Geologic Map
Plate 5 - Logs of Borings 1 and 2
Plate 6 - Log of Boring 3
Plate 1 ~ Key to Borings
Plate 8 - Rock Hardness Criteria
Plate 9 - Plasticity Chart
Plate 10 - Generalized Cross Section A-A.'
~. -
Earth lnves'tlgatlons Consultant.
, .
3-40
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'tiammer requlredto detach \'land specimen. '
canbt scratchQd with Knife or pia. Goug9S orgroove8 to1/41nch '
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Hard
Medium
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EXHIBIT B
.-~'
@ Earth Investigations Consultants
September 26, 2007
Job 2214.01.00
Ms. Amy Cheng
P.O. Box 298
Oakland, California 94604
RE:. GEOTECHNICAL UPDATE.
Proposed Single Family Residential Development
o San Juan Road, APN 342-22-78
Cuoertino. California
Dear.Ms. Cheng:
. INTRODUCTION
Pursuant to your authorization, we have prepared this update to accompany our
1999 design':level; geotechnical report prepared for the previous property owners
Mr. and Mrs. Leber. .We ul1derstand that you propose to construct a single family
residence. Youprojecfis currently in initial design, however, we understand from
our site meeting that you plan a two-to thre&story residence in the upper part of
the site with a driveway ramped off the fringe of San Juan Road. To minimize
grading,you intend.to cQnfinnthe building.pad with the existing slope.
The scope of services undertaken to formulate this update report included the
following tasks:
. Review of adjoining and nearby geotechnical investigations and
construct;on observations in our office files;
. Meeting and site observations with you on September 11, 2007;
. Analysis and preparation of this iJpdate report.
'FINDINGS
The site conditions fol'; this property have not changed from those previously
reported. There Was noevidance of reactivation -of the mapped debris slide. . .It is
apparent this erosional feature .wa$ historically a.ssociated with improper control
of runoff on Sarf J~anRoad. OlJr1999 investigation indicated the property is
underlain' by favorably orientedjnteibedded Santa Clara formation sandstone,
. '. ~~ologi$tS & Engineers
P.O.B~79.S'.PaCJ;fli:.a. ,CA ""940'4?".(650)5.!;j.:1~262 ..-Pax.(6S.o) 5~7-0264
, , " -' ~. . . ." -.' .
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Dee 11 2007 10:43PM P LASERJET FAX
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p.3
.-
Ms. Cheng
Job 2214.01.00
Sept~r26,2007
Page 2
siltstone and claystone beneath approximately 5 feet of undocumented, medium
dense, silty sand fdl and 3 feet of stiff, sandy clay colluvium along the southern
margin, adjacent to the street where we expect the driveway foundation to be
constructed, and 1 % to 2 % feet of soft to firm sandy clay with gravel colluvium in
the anticipated house pad ,area. Subsequent exploration, testing and
construction observations. for the house development adjoining the east side of
the property, and improvement of San Juan Road bordering the south side of the
propertY, confinned stable bedrock conditions in this portion of the hillside.
Stability of the undocumented fit! slope. bordering the south side of the property
was enhanced in 2002 ~by . installation of a stitch-pier/grade beam retention
system as part of improvement of San Juan Road, which also included
resurfacing and control of roadway storm drainage.
DISCUSSION AND CONCLUSIONS
It is our opinion that the findings and conclusions in our 1999 report remain valid
for your proposed residential development of the site. It should be noted that
since our report was submitted;. the California Geological Survey (2002) prepared
aseismic slope h~rdmap. which indicates the property is approximately
located on the southem fringe of the potential hazard zone_ This regional
delineation of a potential landsU~ hazard from strong earthquake shaking is
based upon slope inclination, generalized properties of underlying earth
materials, and proximity to a potential seismic source_ However. based upon
review of the extensive'geotechnical information we have from previous
geotechnical analyses. as Well 'as as-built construction observations and testing
we have performed on adjoining property, we judge the risk low for the
occurrence. of earthquake-induced landsliding on the subject property during a
nearby, future major earthquake on the San Andreas or Sargent-Berrocal fault
zones. The site is underlclinat relatively shallow depths by favorably oriented
bed rock materials. The stability of the undocumented fill at the top of the slope
and the colluvial ,mantle scarred .nthe middle of the site from past debris slide
activity.has been greatly enhanced byth$ improvement of San Juan Road.
. . .
In the following section,we provide seismic parameters for use in structural
design. Other parameters pertaining to grading, drainage and foundations in the
1999 report can be applied to projectd~sign.
,Eartb,lnvestigations,' .' ~o....Jt:aD. ttil .
. ' - .
. . ..
3"""56
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p.4
.;.
Ms. Cheng
Job 2214.01.00
September 26, 2007
Page 3
SUPPLEMENTAL RECOMMENDATION
Seismic DesiQn
. Seismic Zone: 4 (Z=0.40)
. Seismic Source Type A: San Andreas Fault
. Distance to Seismic Source: 5 Y2 km to southwest
. Soil Profile: Sa
Near Source Factors: Na=1.2, Ny==1.6
. Seismic Coefficients: C.::;OAONa,Cy=O.40Nv
REFERENCES
California Geological Survey, 2002, Seismic hazard zones, Cupertino 7 % minute
quadrangle, California: California Department of. Conservation, map scale
1 :24,000.
Cotton, Shires and Associates, 1998, Geologic review, Fluker, proposed
residence, APN 342-22;;.77, San Juan Road, Cupertino, California: Geotechnical
consultant's June 1 review letter to the City of Cupertino Community
Development Department, Job C3018, 3 pgs.
Earth Investigations Consultants, 1.995, proposed house, 22830 San Juan Road,
Cupertino, California: Geotechnicalconsultant's March 7 report to Dr. Queen.
. 1999,. geotechnical investigation, proposed new house, APN 342-22-78,
San Juan Road, Cupertino, California: . Geotechnical consultant's January 29
report to Mr. and Mrs. Leber, Job 1507~01.00, 18 pgs.
, 1999,geotechnicaHnveStigation, proposed new house7 APN342-22-77,
San Juan Road~ Cupertino, Califotnia:- Geotechnical consultanfs January 29
report to Mr. Fluker, Job 1507,02~OC, 18 pgs.
. 1999, Geotechnicati.,vestigation,proposed residence, 22765 San Juan
Road, Cupertino, California: Geotechnical consultanfs January 26 report to Ms.
Nehawandian, Job 1507.03.00, 17 pgs.
. ..1999, Supplemental engineering ge()logicdata,proposec:l house, APN
342~22-77, SanJuan Road. Cupertino,.Califomia: . Geotechnical consultanfs
. June 18reporUo Mr. FJuker,J()b 1507.02;00,2 pgs.
.....
:. - ~..;. '.
. .
~qlt Imrest~~~)Jl$Co.~1I1tants. ,
..:'3~57..
Dee 11 2007 10:43PM P LASERJET FAX
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p.5
Ms, Cheng
Job 2214.01.00
September 26, 2007
Page 4
Earth Investigations Consultants, 2000, 'Geotechnical investigation, proposed
San Juan Improvement, section between Jacinto Road and APN 342-22-077,
Cupertino, California: Geotechnicalconsultant's April 7 report to Mr. Hutton, Job
1635.01.00, 17 pgs.
, 2000, Geotechn'ical' plan review, proposed San Juan Improvement,
section between Jacinto RoadandAPN 342-22-077, Cupertino, California:
Geotechnical consultant's May 15 report to Mr. Hutton, Job 1635.01.00.2 pgs.
Earth Investigations Consultants, 2001 " Geotechnical observation, proposed San
Juan Road improvement, section between Jacinto and APN 342-22-77,
Cupertino, California: ~o~hnicalconsultanf$February 1 report to Mr. Hutton,
Job 1635.01.00, 1 pg.
.2001. GeotechOicalUpdate, proposed house, APN 342-22-77, San Juan
Road, Cupertino; Calif6inia:Geotechnical consultant's March 21 report to Mr.
Fluker, Job 1507.02.00,2 pgs.
, 2001, Geotechnical observations, proposed San Juan Road
improvement, section between Jacinto and APN 342-22-77, Cupertino,
California: Geotechnical consultant's June 7 report to Mr. Hutton, Job
1635~01.00, 1 pg.
, ' 2002. Geotechnicalfii1al'obselVation, San Juan Road improvement,
section between Jacinto'.. and" ,APN ,342-22-77, Cupertino, California:
Geotechnical consuttanfs August28 report to Mr. 'Hutton~ Job 1635_01.00. 1 pg.
. 2002, Geotechnical pier observation, proposed house, APN 342-22-77,
San Juan Road, Cupertino, California: geotechnical consultanfs November 7
report to Mr. Fluker,Job~507.02.00, 1 P9~
. 2003,geotectlOicalgradebeam observation, proposed house, APN 342-
22-77; SanJuan Road" Cupertino, Califomia:geotedmical consuttanfs January
2 report to Mr.Fluker. 'Job 1507.02.00, l' pg.
, 2003, geotechnical observation,retaining wall backdrain, APN 342-22-
77, ,SanJuan Road. Cupertino, Califomia:geotechnical consuttant's January 21
report toMr. Fluker, Job ,1507.02.00, 1 pg.
, "I:<'
.. . . .
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p.6
Ms. Cheng
Job 2214.01.00
September 26,2007
Page 5
We trust this provides you with the information you require at this time. If you
have any questions, please call.
Very truly yours,
Earth Investigation. C.onsultants
~.~
Joel E. Baldwin, II
Engineering Geologist 1132 (renewal date 2128/09)
Distribution: 3 copies mailed to addressee
:3-59
E~.lnvestig.tions Consultan..
~ COTTON, SHIRES & ASSOCIATES, INC.
... CONSULTING ENGINEERS AND GEOLOGISTS
Exhibit C
May 14, 2008
C0048
TO:
ColinJung
Planning Department
CITY OF CUPERTINO
10300 Torre Avenue
Cupertino, California 95014
SUBJECT :
RE:
Geologic Peer Review
Cheng, Proposed Residence
22292 Regnart Road
At your request, we have completed a geologic review of the subject application for
a Hillside Exception using the following documents:
. Geotechnical Investigation (report), prepared by Earth Investigations
Consultants, dated January 29, 1999;
. Geotechnical Update (letter), prepared by Earth Investigations Consultants,
dated September 26, 2007;
. Architectural Plans (7 sheets, 4-scale), prepared by Hawk N. Lee P.E. Consulting
Engineer, dated October 29, 2007; and
. Topographic Survey (1 sheet, 10-scale), prepared by Summit Engineering, dated
November 5, 2007.
In addition to evaluation of the above referenced documents, we have reviewed
pertinent technical documents from our office files and performed a recent site inspection.
DISCUSSION
It is our understanding that the applicant proposes to construct a two to three-story
single-family residence with attached garage in the upper part of the steeply inclined lot. It
appears that the home will be built into the hillside and supported on a pier type
foundation. A driveway will extend from San Juan Road and provide access to the home.
Grading quantities have not been quantified, but appear to be minor.
SITE CONDmONS
The project site is characterized, in general, by steep (27- to 35-degree inclinations),
natural, northeast-facing hillside topography. The parcel is roughly rectangular in shape,
and is bordered to the east, west, and north by residential property, and by San Juan Road
Northern California Office
330 Village Lane
Los Gatos, CA 95030-7218
(408) 354-5542 . Fax (408) 354-1852
e-mail: losgatos@cottonshires.com
www.cot&H68ires.com
Central California Office
6417 Dogtown Road
San Andreas, CA 95249-9640
(209) 736-4252 . Fax (209) 736-1212
e-mail: cottonshires@starband.net
ColinJung
Page 2
May 14, 2008
C0048
to the south. Initial grading for San Juan Road has resulted in a small fill slope along the
downslope side of the road. Recent improvements to San Juan Road include the placement
of concrete caisson 'stitch piers' along the outboard edge of the road to help stabilize this
road fill along the outboard edge, and improved drainage control. An old shallow surficial
landslide appears to be located in the central portion of the site, downslope from the
proposed residential location. Evidence of soil creep was observed throughout the site.
Drainage is generally characterized by uncontrolled sheetflow directed to the northeast.
The City Geologic Hazards Map indicates that the site is underlain, at shallow
depth, by bedrock materials of the Santa Oara Formation (Le., poorly consolidated
sandstone, conglomerate, and potentially expansive claystone). These materials are locally
overlain by residual soil, colluvium and artificial fill. The City Geologic Hazards Map
indicates that the building site is located within an "F" zone, which is defined as "Area of
potential fault rupture hazard within 300 feet east and 600 Feet west of the Manta Vista and
Berrocal faults". The site is also partially located within a CGS designated "Earthquake-
induced landslide" hazard zone. The active San Andreas fault is located approximately 1.75
miles southwest of the project site, and the potentially active Monta Vista fault is
approximately 275 feet northeast of the site.
CONCLUSIONS AND RECOMMENDED ACTION
The proposed development is potentially constrained by steep slopes with the
potential for shallow surficial sloughing and landsliding, expansive surficial soil materials,
surficial soil creep, potential settlement and creep of non-engineered fill, and the
susceptibility of the site to very strong seismic to violent seismic ground shaking. Based
upon our review of the referenced documents, it appears that the Project Geotechnical
Consultant has performed a Geotechnical Investigation and performed a recent
Geotechnical Update at the project site and provided geotechnical design recommendations
that, in general, appear appropriate for the identified site constraints. These
recommendations include constructing the residence on the existing grade with a minimum
of grading, founding the residence on a pier and grade beam foundation system, and
embedding minimum 12-inch diameter piers a minimum of 10 feet into bedrock.
Subsurface investigation at the site reveals that Santa Clara formation bedrock
materials were encountered exclusively. Subsurface exploration on nearby properties also
encountered Santa Clara Formation bedrock materials, thus, the trace of the Monta Vista
fault appears to be located well to the northeast of the subject property. We do not have
geologic objections to the proposed residential development, provided that the
recommendations of the Project Geotechnical Consultant are incorporated into the project
plans. The primary geologic and geotechnical concerns at the site include assurance that
the residential foundation system is embedded sufficiently into competent bedrock
materials, assurance that grading is kept to a minimum and if any cutting or filling is to take
place that pier-supported retaining walls are incorporated, and assurance that surface
drainage is strictly controlled. Therefore, we recommend approval of the Hillside
3-61
COTTON, SHIRES & ASSOCIATES, INC.
ColinJung
Page 3
May 14, 2008
C0048
Exception from a geologic standpoint. We recommend that the following be provided prior
to approval of building permits from a geotechnical standpoint:
1. Supplemental Geotechnical Criteria - The Project Geotechnical Consultant
should consider providing recommendations for minimum pier diameter of 16
inches, to be in conformance with industry standards for residential hillside
foundations along the San Francisco peninsula.
2. Grading and Drainage Plan - A grading and drainage plan should be submitted
that depicts all proposed excavation and fill areas. Grading quantities should be
provided. All surface and subsurface drainage pathways and discharge points
should be identified. Concentrated surface water should not be discharged onto
the slope, but should be discharged to San Juan Road or conveyed downslope in
a control manner to drainage facilities downslope. We do not approve of
discharging surface water into dissipation trenches on the steep slopes.
3. Development Plans - Structural and Architectural Plans should be generated
that include the recommendations of the Project Geotechnical Engineer. The
structural plans should depict the existing stitch piers in San Juan Road
4. Geotechnical Plan Review - The applicant's geotechnical consultant should
review and approve all geotechnical aspects of the Grading and Drainage Plan
and the Development Plans (i.e., site preparation and grading, site drainage
improvements and design parameters for foundations and retaining walls) to
ensure that their recommendations have been properly incorporated.
The Supplemental Geotechnical Criteria, Grading and Drainage Plan,
Development Plans, and Geotechnical Plan Review should be submitted to the
City for review by the City Geotechnical Consultant and City Engineer. The
following should be performed prior to final (as-built) project approval:
5. Geotechnical Field Inspection - The geotechnical consultant should inspect, test
(as needed), and approve all geotechnical aspects of the project construction.
The inspections should include, but not necessarily be limited to: site
preparation and grading, site surface and subsurface drainage improvements
and excavations for foundations and retaining walls prior to the placement of
steel and concrete.
. The Project Geologist should be on site during the pier drilling operations to
assure that piers are embedded into competent bedrock materials, and that
bedrock materials are as anticipated. Consideration should be given to
downhole logging select pier excavations to assure bedrock conditions are as
anticipated.
3-62
COTTON, SHIRES & ASSOCIATES, INC.
ColinJung
Page 4
May 14, 2008
C0048
The results of these inspections and the as-built conditions of the project should
be described by the geotechnical consultant in a letter and submitted to the City
Engineer for review prior to final project approval.
LIMITATIONS
This peer review has been performed to provide technical advice to assist the City
with discretionary permit decisions. Our services have been limited to review of the
documents previously identified, and a visual review of the property. Our opinions and
conclusions are made in accordance with generally accepted principles and practices of the
geotechnical profession. This warranty is in lieu of all other warranties, either expressed or
implied.
Respectfully submitted,
COlTON, SHIRES AND AsSOCIATES, INC.
CITY GEOLOGIC CONSULTANT
(}.~~
John M. Wallace
Principal Engineering Geologist
CEG 1923
~
Patrick O. Shires
Senior Principal Geotechnical Engineer
GE 770
POS:JMW~a
3-63
COTTON, SHIRES & ASSOCIATES, INC.
Jan 03 2008 11:03PM P LASER JET FAX
BARRI E D. COATE
and ASSOCIATES
HorliCl.ttlral Consultants
235315 Swnmit Rxlad
Los Gems. CA 95033
-4061353-1052
1234567
p.2
A TREE SURVEY NEXT TO 22811 SAN JUAN ROAD IN CUPERTINO
Prepared at the Request of:
Amy Cheng
PO Box 298
Oakland CA 94604
Site Visit by:
Barrie D. Coate
Consulting Arborist
December 11, 2007
Job #12-07-201
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Jan 03 2008 11:03PM P LASERJET FAX
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p.3
A TREE SURVEY NEXT TO 2Z811 SAN JUAN CUPERTINO
1
Assignment
On December 11" 2007, I met Amy Cheng, at the property west of22811 San Juan Road
in Cupertino to inspect the oak: trees on the property which are larger than 10 inch
diameter which might be affected by construction..
Summary
Even though the tree canopy on the property first appears to be very dense, a closer
inspection shows that only seven of the trees (one of which is on adjacent property) that
would be directly affected by the construction process are 10 inch DBH (diameter at 4.5
feet above grade) or larger.
The plan used as reference for this report. is titled Site Plan, prepared by Hawk. Lae,
Architect and dated 10/29/07.
Observations
The site is a very steep northwest facing slope with a full tree canopy covering it.
A close examination shows however that of the five trees on the property of 10 inches or
larger in diameter there is one tree (#3) off the property to the west and one tree on the
property line at the northeast comer which could be affected by activity on this property.
Most of the trees on the property are in good health except for those that are so crowded
by adj acent trees that their canopies are very light.
In addition tree #7 near the northeast corner of the property has had its root collar covered
bya considerable amount during the construction on the adjacent property.
Even though that root collar was excavated to some degree it is still buried far above the
original grade.
All of the trees have had soil and litter sift down over the root collars to some degree and
all of those should be cleared to leave the root collars free of soil above original grade.
Considering the steep slope it would be very easy for soil disturbed by excavation to run
down over the root zone of adjacent trees and cover the soil which includes their root
system and/or around their trunks.
It will be absolutely important to prevent that from happening by the installation of silt
fences before any construction activity begins.
Recommendations
I. Silt fencing and tree protection fencing must be installed before any equipment
arrives on site to begin construction..
8. Silt fencing must be comprised of a 2 foot tall mesh green fencing staked to
the grO\.m.d every 3 feet or closer in the locations shown on the enclosed map.
PR6PARED BY: BARRIS D. COATE. CONSULTING ARBORlST
DECIiM BER 11. 2007
3-66
Jan 03 2008 11:03PM P LASER JET FAX
1234567
p.4
A TREB SURVEY NEXT TO ZZ811 SAN JUAN CUPBRTlNO
2
Note that a silt fence is specified downhill from the construction activity area.
No trees were surveyed in the area below that silt fence since they would all
be protected by the installation of the silt fence and should not be affected by
the construction uphill from them.
b. Tree protection fencing must be 6 foot tall chain link fence mounted on 2 inch
diameter galvanized iron pipe post driven at least 2 feet into the groWld.
These fences must be maintained from before any construction activity or land
clearing begins and remain intact and undamaged until all construction
personnel including subcontractors are finished and off site.
2. An inspection by a certified arOOrist must be conducted with a resulting report
provided to the city planning department after these fences have been installed but
before construction begins and at least once thereafter during construction.
3. Any fill soil that is required (as in the parking spaces) must be of sandy loam
material which drains at at least % inch per hour or more and must be installed
without compaction of the native soil.
4. Tree #7 must have the root collar cleaned down to the original grade at which
point at least 5 or 6 buttress roots will be visible surrounding the trunk at the root
collar level.
All soil down hill from this excavation must be removed to allow full drainage out
of the excavation site.
No soil or other materials may be used to replace that excavation since it is
essential that the root collar be kept clean and dry.
5. As noted in the Tree Evaluation Chart which accompanies this report the root
collars of all of the trees have been covered to some degree.
They should all be excavated in an area within 2 feet of the tnmk down to the
point where buttress roots are visible on all sides of the trunk.
6. Three of the trees need cables, one of them very badly.
Tree #3 which is on the adjacent property is no doubt more important to this
property than the adjacent property in which the tree is sited since the tree will
provide critical screening between the properties.
This tree #3 has a structure which makes it extremely vulnerable to splitting apart
at 2 feet above grade.
PREPARED flY: BARRJE D. COATE.CONSULTIN'GARBORIST
DECEMBER 11, Z007
3-67
Jan 03 2008 11:04PM P LASERJET FAX
1234567
10.5
A TREI! SURVEY NEXT TO 22811 SAN JUAN CUPERTINO
3
It will be absolutely essential that a cable be installed between the two halves to
prevent that from happening.
7. Only ISA certified arborists should be allowed to remove trees or prune trees on
this property.
They must guarantee to use Western Chapter International Society of
Arboriculture Pruning Guidelines in their work and must not practice excessive
interior thinning in the process. I enclose a list of arborists who are capable of
perfonning dependable high quality work.
Respectfully submitted,
Barrie D. Coate
BDC/sl
Enel.:
Assumptions and Limiting Conditions
Tree Data Accumulation Chart
Protective Tree Fencing
List of Arborists
Pictures
Plan (provided by client)
PREPARBD BY, BARRIE D. COATE, CONSULTING ARBORlST
DECEMBER 11. 2007
3-68
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p.8
A Tree SUrvey Next to 22811 San Juan Road in Cupertino
Prepared by: Barrie D. Coatel Consulting ArbOrlst
3-71
~ Photo 1 - Trees #1 and 2.
..I,. Photo 2 - Tree #3.
12/11/07
Jan 03 2008 11:06PM
P LASERJET FAX
1234567
p. 10
A Tree SUlVey Next to 22811 San Juan Road In Cupertino
~ Photo 5 -Tree #7.
-!- Photo 6 - The root collar Is
covered.
Prepared by: Barrie O. Coate. Consulting Arborist
3-73
U/ll!07
Jan 03 2008 11:08PM P LASERJET FAX
1234567
p. 11
-
BARRIE D. COATE
and ASSOCIATES
HoI1I~1 CClf1liUhImIs
2:3535 Summit Reed
Los GaID&. CA 95033
~1052
DefinitionS of Terms
Tree Canopy - (Tree Crown) - Consists of all portions of the tree bearing foliage. Commonly applied
to activity beneath. the canopy, also defined. as the area inside.the drip-line.
Drip-line - The line described on the ground directly below the outer edge of1be tree canopy.
The area between the drip-line and the tree trunk contains the majority of the absorbing root tips. Many
more are fOWld beyond this line.
Root Mass -The portion of the tree which supplies water and minerals to the foliage crown (absorbing
roots) and which provides structural support for the crown (secondary roots).
Root Protection Zone - Nominally, the area beneath the canopy plus 50% the radius of the ~anopy on
any given side of the tree (a 40 foot diameter canopy with a 20 foot radius has a 30 foot Wide root
protection zone on any side of the tree).
Branch Attachment - The joint at which limbs or .branche:s join the tnink or limb from which they
originate.
Co-dooiinant Leader - A narrow branch attachment most commonly seen where an upright branch is
competing with tbe natural leader or wberetwo or more vertical trunkS are joined. When they are of
similar or eqwil diameter, a danger of one of them breaking out is created.
Included Bark ~ A condition created when cO,.dominant leaders each produce bark in the narrow
crotch, compounding the problem of poor attachment, and often. leading to breakage.
Absorbing Root Tips - The l"09tS produced in the upper 2 to 3 feet of soil which absorb water and
minerals. The most effective ones' are .found in the top 2-inches if a mulch is maintained on the soil
surface.
Mulcb - Any material which insulates the soil $Ul'face. Organic mulches are preferred since they
decompose to increase the humic acid content of the soil, but rock mulches are better than no mulch,
and allows leaves to be blown off their surface. .
Stub-cutting ~ Removal of a.limb or branch end at a point where no branches emerge. This. is !!
destructive p!:'ocedure.
Drop-croteh Pnming - Removal of the end of a branch back to a side branch of at least 50-10 the
diameter of the portion removed (a 4-inch diameter branch cut back to a 2-inch or larger diameter side
branch).
Lion's Tail Pruning - Excessive thinning of the interior branches and twigs, leaving foliage only at
the ends oflong, often poorly tapered limbs. This procedure is destructible.
3-74
Jan 03 2008 11:08PM P LASERJET FAX
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p.12
., BARRIE D. COATE
and ASSOCIATES
Hor1I aantI CorlSlJIanIs
23535 Summit Road .
Los Getos, CA 95033
4081353-1 052
RECOMMENDED VENDORS
ARBORICUL TURAL SERVICES
.
.
SPRAYING & :
DEEP ROOT_FERTILIZING :
.
I
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,
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,
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.
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,
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,
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.__._----------------------------------------~----~---------_.-~----------------------------- ----------------_._--------~---------~-------_.
: Tree Health Professionals : - ... -- - - .Joe McNeil :
. Gi 1 Mitchell : Certified Amorist :
Consulting Arborist ~ #3 Hatten Ct., Pleasant Hill .
Campbell : 925/676-5232
. 408/929-3040 : ,
I------------------------_._-----------------~-------------~-._______________________________ ________________________________________._____
, I
, I
: :
: Arborwell :
, .
; 2163& Redwood Rd. i
Castro Valley, CA 94546 :
888/969-1733 :
I
I
I
SMALL TREElSBRUB
RESTORATION &: FRUIT TREE
PRUNING
CONSULTING
ARBORISTSfEXPERT
WITNESSES/TREE SURVEYS
ValJey Oak Spray
Sandy Christiansen
San Jose
4081999-0933
KeviD Raftery
Certified Arborist
650/428-8733
Hort SeiellC~ IDe.
2150 Rheem Dr_ #A
Pleasanton. CA 94588
925/48W;211
Peter QuintaDilla
Certified Arborist
831176()..() 160
Tree DedsioDS
Dennis Yniquez
1426 Spruce St.~ Berkeley
510/649-9291
ROOT COLLAR CLEANING
PLANT PATHOLOGISTS
Deborah Ellis
Box 3714
Saratoga, CA 95070
408n25-1357
.
Urban Tree Managemeat : Soil & Plaat Laboratory
Michael Young 1 PO Box 153
Certified Arborist I SantaCJara, CA 95052
. 6501321-0202 ; 4081727-0330
.--------------------------------------------r--------------------~--------------------------
~ ~ .
I
ArborweU : Tbe Crop Doctor
21638 Redwood Rd. . Heath.erVallier Lars!eTrees
Castro Valley, CA 94546: 2751 Ernest PI. Trees of CaJifonIia
888/969--8733 ; Cambria, CA 93428 Joe Amw:
,____________________________________________L_______________~~?!~~~~~?_~?'________________ _______________~~~~~~~~_______________1
,. I
" I
: : EDViroDBleDtal DesigD :
t i Houston, Texas ~
: : Carmel. CA :
: : 831191~358 :
,. I
:------------------~-------------------------t---------------------------~~-~~-.---~~---~~--- .----------------------------------.----------:
. ,
, ,
: :
, .
, .
: :
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, .
, .
, I
, .
TREE MOVING
UP to lQ..iD&:h. diameter trees
.JohD Ana
1593 Koch Lane, San Jose
4081266-1117
'I ,
,--------------------------------------------r------..----.-----------------------------..--- ~.____________________________________________,
t f
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,
,
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,
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,
,
:___________________.________________________t_______________________________________________ _______________.._____________~_______________~
Small Trees & S.rubs
Moffett~ Services
Jim Moffett
4081247-9544
UPDATED 6/07
BDClLanc
3-75
Jan 03 2008 11:08PM P LASERJET FAX
1234567
p. 13
.-
BARRIE D. COATE
and ASSOCIATES
HoJ1lCUl1Kel ConsullsnlS
23535 Stl'nmit Road
LosGetos. CA ~5033
408J35~ 1 052:
ASSUMPTIONS ANDLIMmNG CONDITIONS
1. Any legal description provided to the appraiser/consultant is assumed to be correct.
No responsibility is assumed for matters legal in character nor is any opinion rendered as to
the quality of any title.
2. The appraiser/consultant can neither guarantee nor be responsible for accuracy of
information provided by others.
3. The appraiser/consultant shall not be required to give testimony or to attend court by reason
of this appraisal unless subsequent written arrangements are made. including payment of an
additional fee for services.
4. Lass or removal of any part of this report invalidates the entire appraisallevaluation.
5. Possession of this report or a copy thereof does not imply right of publication or use for anr
purpose by any other than the person(s) to whom it is addressed without Written consent 0
this appraiser/consultant. .
6. This report and the values expressed herein represent the opinion of the ..
appraiser/consultant, and the appraiserlslconsultant's fee is in no way contingent upon the
reporting of a specified value nor upon any finding to be reported.
7. Sketches, diagrams. graphs. photos. etc., in this report. being intended as visual aids, are
not necessarily to scale and should not be construed as engineering reports or surveys.
8. This report has been made in conformity with acceptable appraisal/evalUation/diagnostic
reporting techniques and procedures, as recommended by the International Society of
Arboriculture.
9. When applying any pesticide. fungicide, or herbicide, always follow label instructions.
lO.No tree described in this report was climbed, unless otherwise stated. We cannot take
responsibility for any defects which could only have been discovered by cl.imbing. A full root
collar inspection, consisting of excavating the soil around the tree to uncover the root collar
and major buttress roots, was not performed. unless otherwise stated. We cannot take
responsibility for any root defects which could only have been discovered by such an
inspection.. .
CONSULnNG ARBORIST DISCLOSURE STATEMENT
Arborists are tree specialists who use their education, knowledge, training, and experience to
examine trees, recommend measures to enhance the beauty and. health of trees. and attempt to
reduce risk of living near trees. Clients may choose to accept or disregard the recommendations
of the arbor-ist, or to seek additional advice.
Arborists cannot detect every condition that could possibly lead to the structural failure of a tree.
Trees are living organisms that fail in ways we do not fully understand. Conditions are often
hidden within trees and below ground. Arborists cannot guarantee" that a tree will be healthy or
safe under all circumstances, or for a specified period of time. Likewise, remedial treatments,
like medicine, cannot be guaranteed.
Trees can be managed, but they cannot be controlled. To live near trees is to accept some
degree of risk. The only way to eliminate alt risk associated with trees is to elimina1e aU trees.
a!~~~
Barrie D. Coate
[SA Certified Arborist
Horticul1ural Consultant
3-76
Jan 03 2008 11:08PM P LASERJET FAX
1234567
p. 14
-
BARRIE D. COATE.
and ASSOCIATES
Horti c:utunlt C~tanls
23535 Sunmlt Road
Los GelDS. CA 95033
406r.35$-1052
RECOMMENDED VENDORS
ARBORICUL TURAL SERVICES
f" I
: PENINSULA AREA EAST BAY AREA 1 SANTA CRUZ COUNTY AND
. SOUTH BAY AREA
1 I
, '
. '
, '
: O'Brie.Tree Service Care of Trees :
: Mark O'Brien Ron Eieber : .
: 661 Coleman Ave.. Menlo Park 650/475-S400 :
: 6501327 -0450 :
, '
, .
.. I . .
f-----.----.------~-----.----.------------------~----------------------------~------------------r----------~-----------.~----------------------
, ' .
, . .
: West Coast Tree Care : Care ofTnes :
: Chris Hall : Torrey Young :
: 408/260-2007 or 408/260-2054 : 7800 Edgewater Dr.. Oakland :
: : 510/638-0781 :
~._------------------------_._------------------~----------------------------------------_._----~
I . I
I . ,
. . I
: Vital Tree Care IDe. : Traverso Tree Service :
: '" Fred Jungbluth : JOOn Traverso :
l_._____________~_~9~_~~?~~________________t__________-----~~?!~~~~!----.-----------~
: :
. .
. .
; . : Noooaa.s Tree Care
;. Sam Noonan
. :
: . 1672 Willowside R~ Santa Rosa
: : 707/528.3226
~ ---....-.... --..-. ------ ------"------ -- ---- -.. ---.. ----:
, .
I ,
: :
Artistry 1m Trees
Randy Harris
PO Box 2358, Mill Valley
415/388-2931
I
.
.
:
I
I
.
,
,
I
.
.
I
I
.
.
.
I
~-----------------~.._--------------------------~------------------------------_.._--------------~-----------------------------_._~------.._-----:
. .
: Karel Suehel :
i Davey Tree Expert 3555 Twin Oaks Dr. Napa 1
M'rtch Godfrey
1 408/453-3389 707/252-8174 j
.
. I
., .
~-----------------------------------------------
. .
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.
.
.
.
.
EeoDO Tree Service
.- Henry Kramer
650/367..4900
.
.
I
.
.
,
I
.
.
~_..M_~_______________________~__________________
Care of Trees
Ron Eicher
650/475-5400
Area Custom Tree Serviee
Roo Walker
650/969-7076
* Ma~ Tree Care
Box 608 .
Moss Beach, CA 94038
650/57~15
Arbor Art
Nigel Belton
PO Box: 1744. Aptos
831/688-1239
SumlDit Tree Service
Los Gams
4081353-2085
.
.
.
SAN FRANCISCOIMARIN AREA j
.
,
,
TREE REMOVAL
Can of Trees
Ron Eicher
650/475-5400
STUMP GRINDING
INTERIOR VALLEY
,
,
: Kelly's Stump Removal
: 650/948-0604
: 4081747-1630 -
____.____.____~----------.-----.---------------L------__._____.________________________________ ___._._________~~!~~~~_l________.______!
Grover Tree Service
2825 Kiernan
Modesto. CA 95356
.- spedatia ID Drop-Crotc:h Pm.i.g
UPDATED 6/01
BDCfLaDe
3-77
Apr 21 08
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- BARRIE D. COATE Next to 22811 San
and ASSOCIATES
Hortict.<<Urel Consultants Cupertin
23535 Summit Road
Los GatOS. CA 950:\3 This logo is attached III a plan done by. ano
4080'353- 1 052
ttlis logo is not for ttle purpose of claiming (
horticultural 0 r artloriculltJral infonnaUo
HORTICULTURAL CONSULTANTS Date: December 11, 2007
CONSULTING ARBORISTS Job # 12-07-201
Tree numbers correspOnd to evaluation charts.
All dimensions and tree locations
are approximate.
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ARBOR RESOURCES
EXHIBIT E
professional consulting arborlsts and tree ......, c;
May 6, 2008
Colin Jung
Community Development Department
City of Cupertino
10300 Torre Avenue
Cupertino, CA 95014-3255
RE: San Juan Road, Cupertino
APN 342-22-078
Dear Mr. Jung:
As requested, I have reviewed the following documents regarding the proposed single-
family residence on a vacant lot along the north side of San Juan Road, between 22811 and
22825 San Juan Road addresses: [1] a set of plans by Hawk N. Lee P.E., dated 10/29/07,
and [2] a report by Barrie D. Coate, dated 12/11/07. This letter presents my comments.
The tree numbers and locations are identified on the two attached site maps (copies of
Sheet Al presented in Mr. Coate's report).
Tree Location and Composition
1. Mr. Coate's report identifies seven trees (#1 thru 7), all coast live oaks (Quercus
agrifolia), that are 10 inches or larger in diameter and situated within the immediate
proximity of proposed construction. Due to their size and species, they are regarded as
"~pecimen trees" per Appendix B of Chapter 14.18 of the Cupertino Municipal Code.
2. The trunks of trees #1 thru 7 are located as follows: [a] #1,2,4,5 and 6 are situated
on the subiect site; [b] #3 is situated on the neighboring western property; and [c] #7 is
situated within the public right-of-way (i.e. a "street tree"), and spans both sides of the
adjoining property line with 22811 San Juan Road.
3. Sheet Al (Site Plan) identifies an oak (2, 6-inches in diameter) that does not exist; it is
located at the northernmost section of the proposed home (at the lower deck) and has a
ground elevation of619.84.
p.o. box 25295, san mateo, california 94402 · email: arborresources@comcast.net
phone: G50.G54.3351 · fax: G50.240.0777 · licensed contractor #79G7G3
3-80
..
ARBOR RESOURCES
professional consulting arborlsts and tree care
May 6, 2008
San Juan Road
page 2 of6
4. There are an additional three coast live oaks that are located on the subject site with
trunk less than 10 inches in diameter. Two are located near the road, one being about 6
inches in trunk diameter (elevation 647.45) and proposed for removal, and the other
about 9 inches in trunk diameter (elevation 648.84) and proposed for retention. The
third oak is situated along the northern wall of the residence (elevation 629.49), has a
trunk diameter of about 9 inches, and is proposed for removal.
Review ofPlan.s and Impacts
5. The proposed design identifies the retention of all seven inventoried trees. However,
the close proximity of the proposed home and decking will adversely impact trees #1,
2, 4, 5 and 6 by jeopardizing their longevity, structural form and longevity. The
potential for the significant damage is, in my opinion, extremely high, particularly
when considering construction on a fairly steep slope. Note that because of such
close proximity, it is essential that story-poles for both the home and decking are
established so an accurate assessment of the impacts can be provided.
6. Trees #1 and 2 would sustain a severe level of root and canopy loss. Based on their
location and site terrain, it does not appear feasible for a home to be designed and
constructed at the site without imposing significant impacts that would lead to the
trees' premature decline, instability and/or removal regardless of mitigation measures
employed during construction.
7. Tree #3's survival is anticipated. Pruning of its easternmost section of canopy will be
required, but measures could seemingly be employed to achieve a reasonable assurance
of this tree's survival.
p.o. box 25295, san mateo, 'californla 94402 · email: arborresources@comcast.net
phone: G50.G54.3351 fax: G50.240.0777 · licensed contractor #79G7G3
3-81
.
ARBOR RESOURCES
professional consulting arborlsts and tree care
May 6, 2008
San Juan Road
page 3 of6
8. Tree #4 is subject to significant canopy loss for construction of the upper deck,
essentially requiring most or all of its south side to be removed. It appears that the
extent of canopy removed could be minimized if the section of upper deck within 11
feet of its trunk is omitted from the design.
9. Trees #5 and 6 could s17stain a tolerable, though aggressive, amount of root loss. They
would, though, be subject to significant canopy loss for constructing the proposed
garage and carport.
10. Sheet A4 does not identify the eastern edge of driveway. I assume it will align
perpendicular with the proposed carport or the retaining wall extended by about five
feet beyond the carport. Due to the close proximity to tree #7, the driveway edge and
retaining wall must be defined on Sheet 4. I also suggest Sheet Al show the proposed
driveway layout in its entirety. Note that the driveway should be established at least 8
to 10 feet from tree #7's trunk to avoid conflicts with its canopy.
11. Of the three oaks less than 10 inches in trunk diameter, the 9-inch diameter oak
(ground elevation 648.84) along the road is proposed for retention. However, the
walkway and driveway layout would require revision to achieve a reasonable assurance
of its survival and stability. If this tree was expected to remain and be sufficiently
protected, I suggest a minimum five-foot setback in all directions from its trunk.
Recommendations
12. Recommendations presented in the previous section should be followed for particular
trees being retained.
p.o. box 25295, san mateo, california 94402 · emall: arborresources@comcast.net
phone: G50.G54.335 I fax: G50.240.0777 . licensed contractor #79G7G3
3-82
.
ARBOR RESOURCES
professIonal consulting arborlsts and tree care
May 6, 200S
'San Juan Road
page 4 of6
13. The assigned tree numbers should be shown on Sheets Al and A4 (see locations on the
attached maps). Additionally, given the close proximity of the proposed residence to
trees, an accurate depiction of the trees' canopies should be identified on both plans
(this may require a site visit by the applicant's surveyor or design team member to
identify the entire canopy spreads of each tree).
14. The proposed grading and drainage design should not require soil cuts, fill, trenching,
excavation or compaction beyond 24 inches from the proposed foundation, retaining
wall or driveway where within a distance of a trunk of 10 times its diameter (e.g. a 15-
foot distance for a tree with an IS-inch trunk diameter). Note that vertical shoring shall
be employed to ensure this occurs.
15. On Sheet AI, the scale shown near the bottom right comer should be modified to read
1 "=10'-0".
16. The underground utilities and any dissipater should be routed beyond the trees'
canopies.
17. The "Recommendations" presented within Mr. Coate's report and this letter should be
followed and adopted as conditions of approval for this project.
IS. The permanent and temporary drainage design, including downspouts, should not
require water being discharged beneath the trees' canopies.
19. The landscape design should incorporate the following guidelines:
a. Turf should be avoided beneath the oaks. As an alternative, I suggest a four-inch
layer of coarse wood chips is used.
p.o. box 25295, san mateo, california 94402 · email: arborresources@comcast.net
phone: G50.G54.335/ fax: G50.240.0777 . licensed contractor #79G7G3
3-83
.
ARBOR RESOURCES
professional consulting arborlsts and tree care
May 6, 2008
San Juan Road
page 5 of6
b. Large-growing trees that can exceed the height of retained trees should not be
installed beneath canopies of retained trees.
c. Plant material installed beneath the oak canopies shall be drought-tolerant, limited
in amount, and planted at least five to ten feet from a tree's trunk. A source for
identifying suitable drought-tolerant plant material IS as follows:
www.californiaoaks.org/ExtAssets/CompatibleP lants Under&AroundOaks.pdf
d. Irrigation can, overtime, adversely impact the oaks and should be avoided.
Irrigation for any new plant material beneath an oak's canopy should be low-
volume, applied irregularly (such as only once or twice per week) and temporary
(such as no more than three years).
e. In the event trenches for irrigation and/or lighting are required beneath a canopy,
they shall be installed in a radial direction to the trees' trunks. If irrigation trenches
cannot be routed as such, the work may need to be performed using a pneumatic air
device (such as an Air-Spade@) to avoid unnecessary root damage.
f. Stones and new fencing should not be placed against the trees' trunks (I suggest a
minimum 2' setback). Additionally, mulch should not be placed against the trunks.
g. Tilling beneath canopies should be avoided, including for weed control.
20. Post holes dug beneath tree canopies for any perimeter fencing or deck footing should
be established as far from the trunks as possible (such as at least five feet away). A
post-hole digger should be used to dig the first 2.5 to 3 feet below grade. In the event a
root of two inches and greater in diameter is encountered during the process, the hole
should be shifted over by about 12 inches and the process repeated. All d~gging below
the hand-dug area can occur using a manually-operated mechanical auger.
21. The limits of grading should be staked prior to the certified arborist discussed in Mr.
Coate's report reviews the placement of protective fencing.
p.o. box 25295, san mateo, california 94402 · ema": arborresources@comcast.net
phone: G50.G54.335 I · fax: G50.240.0777 · licensed contractor #79G7G3
3-84
.
ARBOR RESOURCES
professional consulting arborlsts and tree care
May 6, 2008
San Juan Road
page 6 of6
22. Prior to excavating soil for the foundation and any retaining wall for the home, a one-
foot wide trench should be manually dug for the purpose of exposing roots and allow
for a clean cut to minimize root loss. The trenches should be dug to at least three feet
deep or the required depth (whichever is less) and along where soil cuts will occur
closest to the trunks. Any roots encountered during the process shall be cleanly severed
by hand (such as with lopper or sharp saw) against the side of the trench closest to the
tree. All soil inside the trench can be excavated using heavy equipment.
23. Throughout construction during the months of May thru October, supplemental water
shall be supplied to retained trees. The methodology, amounts and frequency should
be discussed and decided with the certified arborist retained for the project.
24. All equipment shall be positioned to avoid the trunks and branches of trees. Where a
conflict arises, the project arborist must be contacted to help address the situation. .
25. The disposal of harmful products (such as cement, paint, chemicals, oil and gasoline) is
prohibited beneath canopies or anywhere on site that allows drainage beneath canopies.
Herbicides should not be used beneath the trees' canopies; where used on site, they,
should be labeled for safe use near trees.
Sincerely,
fv\.>I i. H
David L. Babby
Registered Consulting Arborist #399
Certified Arborist #WE-400IA
Attachments: Site Maps (copies of Sheet Al presented in Mr. Coate's report)
p.o. box 25295, san mateo, california 94402 · ematl: arborresources@comcast.net
phone: G50.G54.3351 · fax: G50.240.0777 . licensed contractor #79G7G3
3-85
SAN JUAN ROAD, CUPERTINO
APN 342-22-078
(trees #1 thru 5)
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Cupertino, California
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APN: 342-22-78
San Juan Road
Cupertino, California
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