HomeMy WebLinkAboutMINUTES - 02262002 - C27 TO: BOARD OF SUPERVISORS AS THE BOARD OF DIRECTORS, WIEDEMANN RANCH
GEOLOGIC HAZARD ABATEMENT DISTRICT
FROM: Maurice M. Shiu,Public Works Director
DATE: February 26, 2002
SUBJECT: ADOPT Resolution No. 200211p accepting Amendment to the Wiedemann Ranch Geologic
Hazard Abatement District Plan of Control and fixing April 9, 2002 for a public hearing
Subdivision Tract 8188, San Ramon area. WO 5511
Specific Request(s)or Recommendation(s)&Background&Justification"
I. Recommended Action:
1. ACCEPT Amendment 1 to the Wiedemann Ranch Plan of Control, and
2. ADOPT Resolution No. 2002/ 110 fixing Tuesday, April 9, 2002, at 9:00 a.m., in the Board of
Supervisors' Chambers, 651 Pine Street,Room 107, Martinez, California, as the time and place for a
public hearing to consider proposed amendments to the Wiedemann Ranch Geologic Hazard
Abatement District (GHAD) Plan of Control and to hear any objections to the proposed
amendments. Copies of the Plan of Control are on file with the Clerk of the Board.
3. DIRECT the GRAD Manager to mail notice of the hearing to all owners of real property within the
proposed District, as described in Resolution No. 2002/ 110
Continued on Attachment:X. SIGNATURE:
—ZI(ECOMMENDATION OF GRAD MANAGER
_RECOMMENDATION OF BOARD COMMITTEE
_�-OPROVE OTHER
.j
SIGNATURE(S):
ACTION OF BOA ON Feb. 2 6, 200?APPROVED AS RECOMMENDED X OTHER
VO'T'E OF DIRECTORS
xX UNANIMOUS(ABSENT )
AYES: NOES:
ABSENT: ABSTAIN:
SE:KG:sr I hereby certify that this is a true and correct copy of an
G:\GrpData\SpDist\Board Orders\2002\02 February\02-26-02 WiedGHAD Amend l.doc action taken and entered on the minutes of the Board of
Contact: Skip Epperly,(925)313-2253 Supervisors on the date shown.
Orig.Div.: PW(Special Districts)
cc: County Counsel
Auditor-Controller FEBRUARY 26 2002
Accounting ATTESTED: ,
Engineering Services JOHN SWEETEN,Clerk of the Wiedemann Ranch
Community Development GRAD Board of Directors and Board Administrator
S.Zovod,McCutchen,Doyle,Brown&Emerson
1331 N.California Blvd.,Walnut Creek,CA 94596
Mike McMillen,William Lyon Homes,Inc. / �r
2603 Camino Ramon,Suite 150,San Ramon,CA 945834289 By !
E.Harrell,Engeo ' eputy
2401 Crow Canyon Road,Ste.200,San Ramon,CA 94583
SUBJECT: ADOPT Resolution No. 2002/ 110accepting Amendment to the Wiedemann Ranch Geologic
Hazard Abatement District Plan of Control and fixing April 9, 2002 for a public hearing
Subdivision Tract 8188, San Ramon area. WO 5511
DATE: February 26, 2002
PAGE Page 2
II. Financial Impact:
All costs will be covered with revenue generated through parcel assessments for the GHAD.
III. Reasons for Recommendations and Background:
In April 2000, the GHAD Board annexed the Presley Henry Ranch Project into the Wiedemann Ranch
GHAD. Subsequently, the United States Army Corps of Engineers (COE) requested amendments to the
GHAD Plan of Control regarding GHAD responsibilities for four wetland frog ponds. In addition, the
General Manager of the GHAD, William R. Gray and Co., Inc. requested amendments to the Plan of
Control to mare it more readable,easier to administer and bring it in line with current industry practices.
Amendment 1 to the Wiedemann Ranch Plan of Control reflects the comments from the COE and
revisions requested by the GHAD manager.
IV. Conseguences.of Negative Action:
The current Plan of Control will remain in effect.
THE BOARD OF SUPERVISORS OF CONTRA COSTA COUNTY,CALIFORNIA
.Adopted this Resolution on February 26, 2002,by the following vote:
AYES: Supervisors Gerber, Uilkema, DeSaulnier, Glover and Gioia
NOES None
ABSENT: None
ABSTAIN;;None'
RESOLUTION NO. 2002/ n
SUBJECT: ADOPT Resolution 2002/110of Intent to Approve an Amendment to the Wiedemann Ranch
Geologic Hazard Abatement District Plan of Control, and fixing April 9, 2002 for a public
hearing to consider objections.
The Board of Supervisors of Contra Costa County, as the Board of Directors of the Wiedemann Ranch Geologic
Hazard Abatement District(GHAD) RESOLVES THAT:
A. On May 21, 1985, pursuant to the provisions-of Section 26550 of the Public Resources Code, the Board of
Supervisors of Contra Costa County (.Board) adopted Resolution No. 85/276 declaring the Board is subject
to the provisions of Division 17 (Sections 26550 et seq.) of said Code, and forwarded a copy of said
Resolution of the State Controller.
B. On September 1, 1998, the Board adopted Resolution No. 98/438 forming the Wiedemann Ranch GHAD
and appointing itself to act as the Board of Directors of the GHAD (GRAD Board).
C. On March 21, 2000, the GHAD Boardwas presented with a Petition for Annexation of Subdivision, Tract
8188 (Lyon-Henry Ranch)'to the GHAD, including Revision 1 to the Wiedemann Ranch Geologic Hazard
Abatement District Plan of Control (Plan of Control). Upon recommendation of the GHAD General'
Manager, the GHAD Board concluded that the Petition and Plan. of Control were substantially in the form
described in Sections 26552 and 26553 of the Public Resources Code.
D. On April 11, 2000, after holding'a public hearing,the Board and the GHAD Board adopted Resolution Nos.
2000/166 and 2000/167, respectively, conditionally approving the annexation,with an effective date of June
13, 2000, or such later date as the GRAD Board held a public hearing on a proposed,assessment on the
annexed property, tabulated the assessment ballots and authorized the assessment. Revision 1 to the Plan of
Control was not separately adopted by the GHAD Board. The GHAD Board also adopted Resolution No.
2000/168 proposing to levy the assessment on the annexed property, directing that notice be given, and
setting a public hearing.
SE:KG:sr I hereby certify that this is a true and correct copy of an
G:\GrpData\SpDist\Board Orders\2002\02 February\02-26-02 WiedGHAD Amend Ldoc action taken and entered on the minutes of the Board of
Contact: Skip Epperly,(925)313-2253 Supervisors on the date shown:
Orig.Div.: PW(Special Districts)
cc: County Counsel ATTESTED: February s nnn11
Auditor-Controller JOHN SWEETEN,Clerk of the Wiedemann
Accounting Ranch CHAD Board of Directors and Board
Engineering Services Administrator
Community Development
S.Zovod,McCutchen,Doyle,Brown&Emerson By �--
1331 N.California Blvd.,Walnut Creek,CA 94596 /lbeputy
Mike McMillen,William Lyon Homes,Inc.
2603 Camino Ramon,Suite 150,San Ramon,CA 94583-4289
E.Harrell,Engeo'
2401 Crow Canyon Road,Ste.200,San Ramon,CA 94583
RESOLUTION NO.2002/110
SUBJECT: ADOPT Resolution 2002/110of Intent-to Approve and Amendments to the Wiedemann Ranch
Geologic Hazard Abatement District Plan of Control, and fixing April 9, 2002 for a public
hearing to consider objections.
DATE: February 26, 2002
PAGE: -2-
E. On June 13, 2000, the Board and the GHAD Board adopted Resolution Nos. 2000/355 and 2000/356,
respectively, correcting Resolution Nos. 2000/166, 2000/167 and 2000/168 to clarify the realproperty that
was annexed'to the GHAD.
F. Also on June 13, 2000, the GRAD Board held a public hearing on the proposed assessment, tabulated
assessment ballots,and adopted Resolution No. 2000/357 authorizing the levy of the assessment.
G. The United States Army Corps of Engineers (COE) has requested several amendments to the Plan of
Control. These amendments concern GRAD responsibilities for four wetland frog ponds.
H. William R. Gray and Co., Inc.,'General Manager of the CHAD, has requested amendments to the Plan of
Control to make it more readable, easier to administer and bring it in line with current industry practices.
I. Upon recommendation of the GHAD General Manager, the GHAD Board concludes that the Plan of
Control as amended is substantially in the form described in Sections 26552 and 26509 of the Public
Resources Code.
J. The amendment of the Plan of Control is exempt from the provisions of the California Environmental`
Quality Act (Public Resources Code Section 21000 et seq.) in accordance with Public Resources Code
Sections 21080(b)(4) and 26559.
NOW, THEREFORE, THE GHAD BOARD HEREBY RESOLVES AND ORDERS, AS FOLLOWS:
1. The GRAD Board will conduct a public hearing (the Hearing) on the amendments to the Plan of Control on
April 9, 2002 at Martinez,'California in Room 107 of the Board of Supervisors' Chambers, 651 Pine Street,
Martinez, California 94553. At the Hearing,any objections to the proposed amendments shall be presented.
2. Notice of the Hearing shall be mailed to each owner of real property included within the GHAD. Notice of
the Hearing shall be mailed first-class, postage prepaid, in the United States mail and postmarked not less
than 20 days preceding the date of the Hearing. Notice of the Hearing shall include a copy of the Plan of
Control as amended. Notice of the Hearing shall indicate where the Plan of Control may be reviewed or
duplicated. Notice of the Hearing also shall set forth the address where objections to the amendments to the
Plan of Control may be mailed or otherwise delivered up to and including the time of the Hearing.
3. At any time not later than the time set for hearing objections to the amendments to the Plan of Control, any
owner of real property within the GHAD may make a written objection to the amendments to the Plan of
Control. Such objection shall be in writing, shall contain a description of the land owned by lot, tract and
map number, and shall be signed'by the owner. Objections shall be mailed or delivered as specified in the
notice procedure in Paragraph 2 of this Resolution.
RESOLUTION NO. 2002/110
NOTICE OF A
PUBLIC HEARING
You are hereby notified that on April 9, 2002,at 9:00 a.m., in Room 107, County Administration
Building, 651 Pine 'Street, Martinez, California, the Wiedemann Ranch Geologic Hazard
Abatement District Board of 'Directors will consider adoption of Amendment l to the
Wiedemann Ranch Plan of Control pursuant to the Division 17 (commencing with Section
26500) of the Pubic Resources Code of the State of California.
The purpose of the hearing is to receive and consider any and all objections to Amendment 1 to
the Plan of Control. Valid objections can be made in writing, not later than the time set for
hearing, by any owner of real property within the boundary of the proposed district. Objections
shall contain a.description of the land owned by lot, tract and map number, and shall be signed
by the owner of such property. Objections must be mailed or delivered to the address set forth
below, and must comply with the provisions of the Public Resources Code Section 26564(copy
attached).
Amendment 1 to the Wiedemann Ranch Plan of Control can be reviewed at the County's Public
Works Department, located at 255 Glacier Drive, Martinez, CA ,94553. It may be duplicated for
the cost of duplication.
For further details, contact the Contra Costa County Public Works Department, Special Districts
Section,255 Glacier Drive,Martinez, CA 94553, or phone William R. Gray at(925) 947-1966.
AMENDMENT 1 TO THE
WIEDEMANN RANCH
GEOLOGIC HAZARDABATEMENT DISTRICT'
(GHAD)
PLAN OF CONTROL
m
£r
SUBMITTED
TO
WIEDEMANN RANCH GHAD
PREPARED
BY
ENGEO INCORPORATED
PROJECT NO.4412-W3
FEBRUARY 1,2000
REVISED DECEMBER 21,2001
COPYRIGHT C 2000 BY EENGEO INCORPORATED. THIS DOCUMENT
MAY NOT BE REPRODUCED IN WHOLE OR IN PART BY ANY MEANS
WHATSOEVER,NOR MAY IT BE,QUOTED OR EXCERPTED WITHOUT
THE EXPRESS WRITTEN CONSENT OF ENGEO INCORPORATED.
EO
GEOTECHNICAL AND ENVIRONMENTAL CONSULTANTS
I N C O R P O R A T E D MATERIALS TESTING
Project No.
4412-W3
December 21, 2001
Mr. William R. Gray, President
William R. Gray and Company, Inc., General Manager
Wiedemann Ranch Geologic Hazard Abatement District
1820 Bonanza Street, Suite 204
Walnut Creek, CA 94596
Subject: Proposed Update to the Plan of Control
Wiedemann Ranch Geologic Hazard Abatement District (GHAD)
Contra Costa County, California
i"4
BCH PLAN OF CONTROL
AMENDMENT 1 TO THE WTEDE AN1 � .�
'
Dear Mr. Gray:
Attached is proposed Amendment 1 to the W emanh Ranch GRAD Plan of Control. The
proposed amendments are intended to reflect 1collv� :
4
1. The April 11, 2000, annexation o£t�i ,'Pres` ',y Henry Ranch Project into the Wiedemann
Ranch GHAD.
2. Comments received from the Ll'h Stas Army Corps of Engineers (USCOE) with respect
,a
to the maintenance and protection� f ai' endangered species habitat that lies within the
boundaries of the GRAD.
3. Revisionssuggested by your office''intended to make the Plan of Control more readable,
easier to administer and to bring it in line with current industry practice.
If you have any questions or would like any additional information, please do not hesitate to
contact us.
Very truly yours,
ENGEO INCORPORATED Reviewed by:
Uri Eliahu Ted Bayham
GE 2166 CEG 2063
uelhg:ghad
cc: 1 —Mr. Dan Curtin
2401 Crow Canyon Road•Suite 200• San Ramon,CA 94583-1545• (925)838-1600• Fax(925)838-7425
www.engeo.com • E-mail:eng$taff(%?engeo.com
EEO
INCORPORATED
TABLE OF.CONTENTS
LETTER.OF TRANSMITTAL Page
I. Authority and Scope ................. ..................... ...............1
PropertyIdentification................. .... ................... ........ ...................... .......................3
II. Background ... ......... ......... ......... .............................. .......................... ........................4
III. Areas of GHAD Responsibility.. .................... ......... ......... .................. .......... ..............6
The Prevention,Mitigation,Abatement and/or Control of Geologic Hazards..............6
Exceptions....... ............. .................................................... ....... ..................................6
Hazard(s) Limited to a Single Property...................................................................6
Hazard(s) or Failure(s) Resulting from Negligence.................................................7
Property Not Located'Within GHAD Boundaries..... ................... ........................7
Geologic Hazards in Open Space and Maintenance of Open Space Areas.... ..............8
Creek Corridor and Detention Basin Mainte�ce Responsibilities .....9
Wildlife Habitat Mitigation Pond M, 017 .. .. ............ ...... ...
10
IV. Funding and Acceptance of Responsibiliti" y GOAD 12
Iinitial Developer Contributions....... ...12
Property Owner Assessments ........ .. ..... ................ ................................ ............12
Responsibility for GHAD Activit s. ..............................................................
13
Initial Financial Responsibilit off : er........................................................
13
Transfer of Responsibilit the� "it"
rc ........, ....... ....... ........ ............14
Biological Monitoring aanteriance of WildlifeHabitat Mitigation Ponds...14
V. Priority for GHAD Funded arts
Y
..............................................................' . ......•
.,....... .... . ,..... ............ .................... ....................................17
VI. Site Geology..
Geologic Units... ....... 17
Pliocene SedimeftR Rocks
17
Miocene Sedimen a s............................................ ...................... ........... 17
Colluvium . ..18
Alluvium................................................................................................................18
Landslides.................................................................. ...........................................18
ResidualSoils ....................................... .................... ..........................,...............19
WeatheredBedrock......................... .............................................. .......................19
GeologicStructure.......................................................................................................20
VII. Geologic Hazards... ............................... ...................................... ................... .............21
SlopeInstability......................................................................... ..:..............................22
Slope Stability Considerations ...... .. ......... ......... ......... ......... .......... .......................23
VIII. Geotechnical Techniques for Mitigation of Landslide and Erosion Hazards............26
IX. Biotechnical Recommendations for Prevention and Mitigation of Existing or
Potential Erosion Hazards ...................: . ._.. .....,... ......... ........ ............. .....................28
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Revised December 21, 2001 l
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X. Maintenance and Monitoring Schedule................... ...................................................: 29
Geotechnical Resources............................................. ..... ................... ......................29
Biological Resources ...... .................. ......... ........................................ ......................30
SELECTED REFERENCES
APPENDIX A Figure 1 —Limits of Wiedemann Ranch
Figure 2--Limits of Presley Henry Ranch Project
Figure 3 Detention Basins to be maintained by GHAD—Wiedemann Ranch
Figure 4—Mitigation Ponds to be maintained by GHAD-Presley Henry
Ranch Project
Figure 5--Grading Plan—Wiedemann Ranch
Figure 6—Grading Plan—Presley Henry Ranch Project
Figure 7—Site Geologic Map—Wiedemann Ranch
Figure 8 Site Geologic Map—Presley Henry Ranch Project
Figure 9---Open Space Within Presley..-Henry Ranch Project
Exhibit A—Legal Description—WVe',Y1�..
mann Ranch
Exhibit B—Legal Description—Pr �nry Ranch Project
APPENDIX B Sycamore Associates, 1998, Fo al Wetland and Red-Legged Frog Biological
Mitigation Plan,Henry Ranch, S ahitjkamon, Contra Costa County, California.
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Y. Authority and Scope
The Contra Costa County Board of Supervisors formed the Wiedemann Ranch GeologicHazard
Abatement District ("GHAD" or "District") on September 1, 1998, (Resolution 98/438) under
authority of the California Public Resources Code (Division 17, commencing with
Section 26500). Formation of the Wiedemann Ranch GHAD satisfied a project condition of
approval on the Wiodemann Ranch Project.
The City of San Ramon required either formation of a new GHAD or annexation to an existing
GRAD in conjunction with its approval of Subdivision 8118 (the Presley Henry Ranch Project).
Given the similar geologic conditions at the two pro�ts, the developer of the Presley Henry
Ranch Project chose to petition the Board of Directosf the ° ,iedemann Ranch GHAD to annex
J ,
the Presley Henry Ranch Project into the GHADd On 1A.,pril 11, 2000, the Board of Directors of
the Wiedemann Ranch CHAD and the Cad a Costa,Board of Supervisors, by Resolutions
Nos. 2000/166 and 2000/167, conditionally ap T h. annexation of the City of San Ramon
Subdivision 811$ (the Presley HenryR04i Project) into the Wiedemann Ranch GRAD. The
annexation became effective on June 13 200
Section 26509 of the Public Resi ces Qbde requires a Plan of Control, prepared by a State
Certified Engineering Geologist,' as a rerequisite to formation of a CHAD. An Engineering
Geologist, certified pursuant to Section 7822 of the Business and Professions Code, prepared the
original Plan of Controlfor the Wiedemann Ranch GRAD. The Business and Professions Code
requires a Plan of Control to describe in detail, geologic hazards, their location, who is affected
by them, and most significantly, a plan for the prevention, mitigation, abatement, or control
thereof. In accordance with the requirements of the Public Resources Code, a proposed revision
to the original Wiedemann'Ranch Plan of Control was submitted with the petition to annex the
Presley Henry Ranch Project into the Wiedemann Ranch GHAD. On March 11, 2000, by
4412-W3
February 1, 2000
Revised'December 21, 2001 1
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Resolution No. 2000/119, the Board of Directors found the proposed revision to the Plan of
Control adequate for the proposed annexation.
Subsequent to the annexation of the Presley Henry Ranch Project into the Wiedemann Ranch
CHAD, William R. Gray and 'Company, Inc., General Manager of the Wiedemann Ranch
CHAD, initiated a review of both the existing Wiedemann Ranch GHAD Plan of Control as well
as the proposed revision to the Plan of Control that was submitted with the annexation petition.
In late spring 2000, the United States Army Corps of Engineers requested additional
modifications to the Plan of Control related to the maintenance and protection of certain
endangered species habitats that lie within the boundaries of the WiedemannRanch GRAD.
g�
On 2002, the General Manager of the Wiedemann l och CHAD presented a proposed
amendment to the Board of Directors for their�`Aonsde7ation. The proposed amendment was
t
intended to reflect: (1) the annexation of t,11 e City an Ramon Subdivision 8118 (Presley
Henry Ranch) to the GRAD, (2) input froi tle 't-111Yted States Army Corps of Engineers
(USACE) with respect to the maintenarfe i ffid pc3 tion of the endangered species habitat, and
(3) revisions suggested by the General �riager to make the document more readable, easier to
administer and bring it in line math current f stry practice. The Board circulated the proposed
amendment fordays and, on b-', 2002, after a noticed public hearing, approved this
amendment to;the Plan of Control by Resolution No. 2002/
As used in this Plan of Control, and as provided in Section 26507, "geologic hazard" means an
actual or threatened landslide, land subsidence, soil erosion, earthquake, fault movement, or any
other natural or unnatural movement of land or earth.
4412-W3
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Revised December 21, 2001 2
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PropertyIdentification
The boundaries of the Wiedemann Ranch CHAD, the Wiedemann Ranch Project and the Presley
Henry Ranch Project are shown on Figures 1 and 2, respectively. Legal descriptions are
included in Exhibits A and B.
4412-W3
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Revised December 21,2001 3
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II. Background
The Wiedemann Ranch Project is a 1,137-acre area approved for development of 371 residential
units along the south side of Norris Canyon Road, west of the intersection of Norris Canyon and
Bollinger Canyon Roads, located in an area known as "Westside" of San Ramon, but the
Wiedemann Ranch is currently within unincorporated Contra Costa County. The Contra Costa
County Board of Supervisors formed the Wiedemann Ranch Geologic Hazard Abatement
District(CHAD) on September 1, 1998,by Resolution No. 98/438.
The Presley Henry Ranch Project (City of San Ramon Subdivision 8188) is a 91.49-acre area
approved for development of 100 residential units in tCity of San Ramon. The Presley Henry
Ranch Project has a common boundary with the Wi e 3 anch Project and the Wiedemann
Ranch GHAD as shown on Figure 2. The Con, 'Cosf'a County Board of Supervisors and the
Board of Directors of the Wiedemann Ranch .GHAffditionally approved annexation of the
Presley Ranch Project into the Wiedemann lich5'` AD on April 11, 2000, by Resolution
Nos. 2000/166 and 2000/167. Both th-e Contra Costa County Board of Supervisors and the
Board of Directors of the Wiedemann anch 'G AIT imposed a condition on the annexation
requiring that property owner a#sessmer be"Ievied on properties within the area to be annexed
�e
before the annexation could be
Goo
ide d final. The Board of Directors levied the property
owner assessments, after a noticed lic Hearing, on June 13, 2000, with the adoption of
Resolution No. 2000/357. The effective date of the annexation was therefore June 13, 2000.
Title to the open space within the Wiedemann Ranch` Project and the Presley Henry Ranch
Project has been conveyed to the Homeowners' Associations (HOA's) formed within the two
projects and a trail easement within the Presley Henry Ranch Project open space has been
dedicated to the City of San Ramon. As the open space within and immediately adjacent to
subdivision tracts is an amenity that benefits all of the property owners within those subdivisions,
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funding for general maintenance activities in the open space areas is shared by property owners
within the project boundaries.
k
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Areas of CHAD Responsibility
When the Board of Directors formed the original Wiedemann Ranch CHAD in the fall of 1998,
and when it approved the annexation of the Presley Henry Ranch project into the GHAD in the
spring of 2000, it established budgets and set assessment levels for properties within the District.
Although assessments are levied and collected separately for the properties within the boundaries
of the Wiedemann Ranch and Presley Henry Ranch projects, it was the intent of the Board that
all properties within the boundaries of the WiedemannRanch CHAD be provided equal
treatment insofar as the provision of GHAD services is concerned. This Plan of Control is
intended to define the GHAD's responsibilities.
The Prevention Miti ation Abatement and/or Controf of Geo is Hazards
J
Subject to the following exceptions, the prin" oris' of the GHAD shall be the prevention,
mitigation, abatement, and/or control of geologic °lards within its boundaries that have
damaged, or that pose a significant tht�f
o damage to site improvements within the developed'
areas of the projects: As used her the term "situ improvements" means buildings and
H
outbuildings, roads, sidewalks, aths, u iitics, improved trails, swimming pools, tennis courts,
gazebos,cabanas, geologic stabiliz�on futures, or similar improvements.
Exceptions
The CHAD may decline to prevent, mitigate, abate or control geologic hazards under the
following circumstances.
Hmard(s) Limited to A Single Property. The GRAD may decline to prevent, mitigate,
abate or control a geologic hazard(s) which is limited in area to a single parcel' of
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property, unless said geologic hazard has damaged (or poses a significant threat of
damage to) other properties and/or other site improvements within the GRAD
boundaries. This single,lot exclusion does not apply to geologic hazards existing on
open-space property owned by any homeowner's associations within the GHAD.
Hazard(s) or Failures Resulting;From Negligence. The GRAD may decline to prevent,
mitigate, abate or control geologic hazards or 'failures that occur as the result of
negligence of a property owner and/or a property owner's contractors, agents or
employees in developing,investigating, grading, constructing, maintaining or performing
or not performing any work on the subject property.
Property not Located within GHAD Boundaries. Eko t as herein provided, the GRAD
shall not prevent, mitigate, abate or contr geologic hazards located on property that is
not located within the GRAD bound es In th event however,that all or any portion of
a geologic hazard existing on prope loud outside the GHAD boundaries has
r
damaged or poses a significa9`sl of daiage to site or other physical improvements
locatedon property within the ;- Al3 156undaries the GHAD may prevent,p ent, mitigate,
abate, or control the g oI gic air The CHAD shall maintain the Wildlife Habitat
Mitigation Ponds that are` , ted J0, the west of the Presley Henry Ranch portion of the
District, even though the pond 'Are physically located outside of the boundaries' of the
District.
Any work conducted on property located outside of the GRAD boundaries, with the
exception of work necessary to maintain the Wildlife Habitat Mitigation Ponds, shall be
strictly limited to that which is absolutely necessary to prevent, mitigate or control the
damage, or threat of damage, to property located within the boundaries of the GHAD.
Should the GRAD be required to respond to a geologic hazard outside the boundaries of
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the GRAD, the CHAD may take such actions as may be appropriate to recover costs
incurred as a result of preventing, mitigating, abating or controlling such geologic hazard
from the responsible party;if any.
Geologic Hazards in Open Space and Maintenance of Open-SpaceAreas
The GHAD may prevent,mitigate, abate, or control the geologic hazards in open space areas and
other unimproved areas within the boundaries of the CHAD if said geologic hazards have
damaged or have the potential to damage site improvements located on properties within the
boundaries of the CHAD. In conjunction with this responsibility, the GRAD is authorized to
maintain geologic stabilization features (e.g. ditches, hes, walls, drains, subdrains, etc.) that
are located in open space areas or other unixnprove areas$'i pl ding hillside slopes extending
uphill from debris beaches outside of the private lit,b0 Adaries:
The GHAD is also authorized to monitor erosion aridsedimentation in open space areas that
affect developed lots and/or improvements (see Section IX for definitions of erosion and
s
sedimentation). The GHAD is furthei`4111fiorizv`u to maintain surface and sub-surface drainage
ked in o n space areas, including, but not necessarily limited to
facilities and improvements loc..
concrete V-ditches, storm drain role autlets in open space and creek corridors and subdra n
outlets.
The CHAD is not responsible for general maintenance of open-space areas (weed abatement,
trail maintenance, fire control, etc.). It was the intent of the Board of Supervisors and the City of
San Ramon, when they approved the Wiedemann Ranch and the Presley Henry Ranch projects,
that general maintenance of open-space areas be the duty and responsibility of Homeowners
Associations (HOA's) to be formed within the boundaries of the two projects. The role of the
CHAD is limited to overseeing and supervising the HOA's general physical maintenance of the
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open-space areas as maybe required to prevent, mitigate, control or abate erasion, sedimentation
and potential landslide hazards.
Routine clearing of firebreaks and general maintenance of the open space (other than hazard
abatement)is the responsibility of the HOA's (as described in the Governing Documents of said
associations) subject to the review and approval of the CHAD should said activities,'in the
opinion of the GHAD, have the potential to damage or interfere with the operation of any CHAD
maintained improvements; to cause an increase in erosion and/or sedimentation or to in any
manner, aggravate or increase the potential of a landslide.
Consistent with the Governing Documents of the HO far the Wiedemann Ranch' and Presley
Henry Ranch projects, the GHAD may review an has right to approve or disapprove
physical construction, maintenance or repair actipiposed within the open space areas that,
in the discretion of the GRAD, could increase, erosiol r sedimentation or otherwise impact or
NP
affect the geologic stability of the area.
Should the CHAD be required to per4fb E open-space maintenance activities that are otherwise
the responsibility of others (such as wee &aliacment, mowing, trail maintenance or other general
}
maintenance activities) prevent, n , ate�3 bate, or control a specific landslide or erosion hazard,
the GHAD shall take such actions as nl be required to recover costs incurred as a result of such
activities from the responsible party.
Creek Corridor and Detention Basin Maintenance Responsibilities
The GHAD is responsible for maintenance activities in selected creek corridors within the
Wiedemann Ranch project as well as the maintenance of two (2) flood control detention basins
within the boundaries of the Wiedemann Ranch and the Presley Henry Ranch projects.
4412-W3
February,1, 2000
Revised December 21 2001 "°q
ENGE0
INCORPORATED
The creek corridors that are the responsibility of the CHAD are shown on Figures The
detention basins that are maintained by the GHAD are shown on Figures 3 and 4.
The GHAD's creek maintenance responsibilities are limitedto the repair of substantial bank
failures that directly damage or'threaten actual site improvements (including buildings, utilities,
trails and roads). Creek bank improvement projects, including armoring of channels with rock or
other materials,may be undertaken by the GRAD as required.
The GHAD's detention basin maintenance responsibilities include periodic inspections as
necessary to check for accumulated sediment,the condition of inlets and outfalls and vegetation.
The GHAD's responsibilities are limited to the remov ),excess sediment, vegetation, or debris
that interfere with or otherwise inhibit the intended function the detention basins and/or thew
outfall structures. Attention is to be given to p1*'
other obstructions that may interfere
with access to the detention basins by power men
Wildlife Habitat Mitigation Pond Mainte ce i
The Wiedemann Ranch GHAD 14Jresporigible fibr maintenance of two(2)Wildlife Habitat Mitigation
Ponds, shown in Figure 4, located`t e est of the Presley Henry Ranch project, outside of the
boundaries of the CHAD. As part of tenvironmental approval process for the Presley Henry
Ranch Project, these Wildlife Habitat Mitigation Ponds were established. Maintenance of these
ponds is the responsibility of the CHAD, since improper functioning of the ponds could result in
slope failures and consequent siltation within the improved'portions of the Presley Henry Ranch
Project. Maintenance of these areas shall be in accordance with the mitigation-monitoring plan
approved for the Presley Henry Ranch Project (Sycamore Associates, November 1998)
(Appendix B)
4412-W3
February 1, 2000
Revised December 21, 2001 10
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The specific responsibilities of the CHAD include the following tasks:
1. Regular monitoring (by a qualified Biologist) for CRLF predators and annual drying of two
mitigation wetland frog ponds in high rain years (thesewere designed to dry down naturally
in most years).
2. Repair and replacement of cattle exclusion fences around created wetlands and enhancement
areas as necessary.
3. The implementation of remedial actions related to the resources.
5;
4412-W3
February 1, 2000
Revised December 21, 2001 11
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INCORPORATED
IV. Funding and Acceptance of Responsibility by GHAD
Initial Developer Contributions
The Conditions of Approval imposed by the County of Contra Costa on the developer of the
Weidemann Ranch required the project to contribute $200,000 to finance the initial operation of
the GHAD and to help establish an appropriate reserve fund for the GHAD until the revenues
from the property assessments become available. The deposit has been received and deposited in
an interest bearing account for the benefit of the District.
As with the Weidemann Ranch,project, the City ofrO �i6—�fiWce
amon required the developer of the
PresleyHenryanch project to contribute $50 000 the initialY y P Joperation of the
CHAD and to augment the reserve funds until th �evepSes from property assessments within the
area being annexed became available. The d it has'; en received and deposited in an interest
bearing account for the benefit of the District.
Property Owner Assessments g
The activities of the Wiedemann ch' HAD are funded through property owner assessments
levied against properties within its bou �daries. Annual assessments were authorized and levied
by the Board of Directors of the GHAD for properties within the boundaries of the original
Wiedemann Ranch Project on October 20, 1998, by Resolution No. 98/537. The Board
authorized and levied annual assessments on properties within the boundaries of the annexed
Presley Henry Ranch Project on June 13, 2000,by Resolution No. 2000/357.
All activities of the GHAD, as defined in this Plan of Control, assume and are subject to a
continuation of the property owner assessments.
4412-W3
February 1,2000
Revised December 21, 2001 12
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Responsibility for GHAD Activities
1. Initial Financial Responsibility of Developer. The party that, on the date a Final Map within
the boundaries of,the GHAD is recorded in the office of the Contra Costa. County Recorder,
owns the developable parcels that are -shown on said Final Map shall be financially
responsible for all GHAD and GHAD related activities (as defined in this amended plan of
control) on all property within the boundaries of said Final Map, including any open space
shown on said Map. Financial responsibility for all'GHAD and CHAD' related activities,
including the maintenance of facilities and the repair of landslides that may occur within the
property, will continue until the automatic transf " described in paragraph 2 below takes
place.
i)
During the period between 'approval o ka Final ap' (or Maps) for property within the
original Wiedemann Ranch Project to the"4 te„o oatic transfer of responsibility to the
CHAD, HCV (or its successors or assi6ns) 1 be financially responsible for all GHAD and
GHAD related activities (as definereiri ' or the property within the boundaries of the
original Wiedemann Ranch onion tithe Dstrict.
During the period between final approval of a Final Map (or Maps) for property within the
Presley Henry Ranch Project to the date ;of the automatic transfer of responsibility to the
GRAD, Presley(or its successors or assigns) will be financially responsible for all GHAD
and GHAD related activities (as defined herein)for the property within the boundaries of the
Presley Henry Ranch portion of the District.
The petitioners for formation of the original Wiedemann Ranch GRAD and the petitioners
for the annexation of the Presley Henry Ranch Project into the District intended that the
4412-W3
February 1, 2000
Revised December 21, 2001 13
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INCORPORATED
approximately three year period between the levying of the first GRAD assessments and the
formal transfer of financial responsibility to the District(see paragraph 2 below) would allow
the District sufficient time to accumulate funds to operate and to build up an adequate reserve
account.
2. Transfer of Responsibility to the District. Financial responsibility for CHAD activities(other
than for those elements of the Biological Monitoring Program noted in paragraph 3 below),
as defined in this Plan of Control, shall transfer automatically to the District (by area, defined'
by the boundaries of the Final Map(s)) at 9:00 a.m. on the day exactly three years after a
Final Map is approved, or two years after the completion of rough grading (as defined by
final acceptance of the grading by the responsible ency), whichever is later. As multiple
Final Maps are to be recorded for the Wiede. tann
R and the Presley Henry Ranch
projects, it is anticipated that the automatic sfe ,of financial responsibility to the CHAD
will take place at different times for diffe"; gt'Alphical areas(Final Maps).
Prior to the transfer of financial resp€insbility to the District, GHAD may inspect the
property subject to the transfer. Cr` willadvise, in writing, the responsible party (as
defined in 1 above)of any ficienel-s with facilities to be maintained by the Districtandlor
of any landslides or potential ladslided that should be repaired. If the responsible party does
not correct said deficiencies andlor el
said landslide(s) and the GHAD takes subsequent
action to correct the deficiencies and/or repair the landslide(s), the CHAD may take such
actions as may be required to recover any costs incurred from the responsible party.
3. Biological Monitoring and Maintenance of Wildlife Habitat Mitigation Ponds. Financial
responsibility for biological monitoring and maintenance of the Wildlife Habitat Mitigation
Ponds, as detailed in the Final Wetland and Rede-legged Frog Biological Mitigation Plan
(Appendix B), shall transfer automatically to the District at 9:00 a.m. on the day exactly five
4412-W3
February 1 2000
Revised December 21, 2001 14
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INCORPORATED
years after the Final Map for the Presley Henry Ranch project is recorded. Prion to that time,
financial responsibility,for monitoring and maintenance of the Wildlife Habitat Mitigation'
Ponds shall be the sole responsibility of the developer of the Presley Henry Ranch project(or
his successors and assigns).
Notwithstanding the above however, responsibility for the annual drying of the Wildlife
Habitat Mitigation Ponds shalltransfer to the CHAD when financial responsibility for other
CHAD activities`in the Presley Henry Ranch portion of the District transfers in accordance'
with paragraph 2 above.
Prior to the transfer of financial responsibility for ological monitoring and maintenance of
the Wildlife Habitat Mitigation Ponds to the District, GH j,, may inspect the ponds. CHAD
will advise, in writing, the responsible party o`�any 4eficiencies that might exist with respect
3
to facilities that are to be maintained by t Di tr If the responsible party does not correct
said deficiencies to the satisfaction of the trjct" hd the CHAD takes subsequent action to
correct the deficiencies and/or re air t%:lan slide(s), the GRAD may take such actions as
may be required to recover any costs curred from the responsible party.
4412-W3
February 1, 2000
Revised December 21, 2001` 15
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INCORPORATED
V. Priority for CHADFunded Repairs,
Emergency response and scheduled repair expenditures are to be prioritized by the General
Manager, utilizing his discretion,based upon available funds and the approved operating budget.
Should available funds not be sufficient to undertake all of the identified remedial and preventive
stabilization measures; the expenditures shall be prioritized as fellows in descending order of
priority:
A. The prevention:, mitigation, abatement; or control of geologic hazards that have either
damaged or pose a significant threat ofdamageto residences, critical underground utilities
or paved,streets.
h
B. The prevention, mitigation, abatement or co Dol Eh. geologic hazards that have t a e either
damaged or pose a significant threat of damage to an Ary structures, including but not
limited to pool cabanas or restroom buil in
C. The prevention, mitigation, abatementr , trol'3 geologic hazards existing entirely on
open-space property and which havenether cl�r�iaged nor pose a significant threat of
damage to any site improvements.A;
D. The prevention, mitigation,'abate; `efit or'�48ontrol of geologic hazards that have either
damaged or pose a signifinnt' damage limited to loss of landscaping or other
similar non-essential an ewes.
Notwithstanding the above, the GH I all prioritize funding for maintenance of the biological
habitat.
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February 1, 2000
Revised December 21, 2001 16
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INCORPORATED
VI. Site Geology
Geologic Units
The geologic units mapped on the Wiedemann Ranch and Presley Henry Ranch Project includes
bedrock and surftial deposits consisting of colluvium, alluvium, landslides, and existing fill
which are described below. These units are consistent with the geologic conditions within the
existing GHAD boundaries.
Bedrock at the site has been mapped by Dibblee (1980) as belonging to two general units,
non-marine sedimentary rocks of Pliocene age (Tps) ` arine sedimentary rocks of Miocene
4
age. The Miocene-age rocks have been subdivided b tbI e (1980) into two units,a sandstone
and minor siltstone (Tmss), and siltstone and nur. sandy shallJTmsl). Crane and Lyon (1995)
grouped bedrock units somewhat differently than I1 blee, at a regional scale. Dibblee's units
are used in this report. Mudstone, an inclusive,td rrn: oth siltstone and claystone, was used as
a classification term by Dibblee (1980) .
x .,
Pliocene Sedimentary Rocks: Rl cene nonmarine sedimentary rocks consist of
sandstone, siltstone, conglom`e .te, and claystone,with a few thin marl beds. These rocks are
relatively erodible and are sublet .' ` 'landsliding; natural outcrops are rare. The rocks are
typically red-brown to greenish-gray in color, weakly to moderately undulated or cemented,
and moderately fractured. The Pliocene rocks are limited to the northeastern portionof the
site.
Miocene Sedimentary Rocks. These marine sedimentary rocks include the Tmss and"Tmsl
units of Dibblee (1980) and consist predominantly of light brown sandstone, gravelly
sandstone, fossiliferous sandstone and siltstone. The sandstone is generally little` to
moderately weathered, of low to moderate hardness, and closely to widely fractured.
4412-W3
February 1, 2000
Revised December 21, 2001 17
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INCORPORATED
Bedrock of this unit typically crops out or within a few feet(less than 3feet)of the surface
on ridge tops, in the bottom of drainages, and locally on hillslopes. In particular, sandstone
of this unit locally crops out as resistant layers traversing slopes and capping ridges in the
southeastern portion of the site. The siltstone is typically softer than the sandstone, more
weathered,closely fractured,and more prone to erosion and landsliding.
Colluvium. Colluvial material consists of unconsolidated slopewash deposits composed of
silt, clay and lesser amounts of sand, gravel, and cobbles in a heterogeneous mixture.
Colluvium generally mantles lower slopes and occupies hillside swales where it is subject to
creep (the gradual downslope movement of soil'by gravity) and landsliding. Colluvium is
typically about 5 to 10 feet thick in swales. It is erally unstratified to weakly stratified,
moderately permeable, moderately to highly p sti ai easily erodible. The colluvium
grades into and interfingers with alluvial de sits oh the lower slopes of the valleys of the
unnamed creek and San'Catanio Creek .,
Alluvium. Alluvial material consits f unconsolidated crudely stratified stream deposits
lt, c ,t and sand, with occasional thin lenses of gravel.
predominantly composed of si
Alluvium.occurs as fans at!.(l e rno4s{of some drainages, and occupies the broad, gently
sloping portions of the valley,��f t unnamed creek and San Catanio Creek. Alluvium
grades into and interfin" ers with c� uuvium on the lower slopes, The alluvium is generally
�' g p _ g rally
moderately permeable :and; easily eroded Alluvium up to tens of feet in thickness was
encountered in some borings.
Landslides. Landslide deposits consist of masses of unconsolidated material and/or bedrock
that have moved'downslope by sliding, falling, or flowing. Many landslides, ranging in size
from very small to large, occur on the site. The landslides range in age from active (recent)
to Pleistocene (10,000 to 2 million years ago) and include soil slips, earth flows, debris
4412-W3
February 1, 2000
Revised December 21, 2001 18
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INCORPORATED
slides, areas of shallow slumps and gullying, several large predominantly;.rotational slumps,
and translational slides.
Shallow (less than 5 feet thick) to moderately deep (5 to 15 feet thick) earth flaws, and soil
slips are the most prevalent types of landslide at the site. Shallow landslides range»from
dormant to active, and typically occur on the steeper slopes, along drainages and in swales,
and within larger slide masses. No evidence of recent'debris flow activity was identified at
the site. Surficial"deposits at the site are generally clay-rich and relatively fast-moving debris
flows with long runout zones that are atypical of such clay-rich materials.
A number of large, deep (greater than 15 feet) Ian ides were identified at the site. Several
of these landslides are earth flows or earthflow cots exes, both active and dormant.
However, most of the large landslides are doant; tational'slumps and translational slides
involving large, relatively intact massefwf bedr . and are characterized by a rounded,
subdued topography.
Residual Soils. Residual soils con8i 14riman of silty to sandy clay or sandy silt developed
in place on underlying pa#""-. ma.te als?i,i,Residual soils vary in thickness from less than
1 foot on ridge taps to severidIt . et thick in valley areas. Residual soils generally contain
organic material and range from I to high plasticity and have a low to high expansion
potential.
Weathered Bedrock. Weathered bedrock consists primarily of silty to sandy clay or clayey to
sandy silt derived from the partial to thorough alteration of bedrock materials. Weathered
bedrock often retains the original rock fabric.
4412-W
February 1, 2000
Revised December 21,2001 19
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Geolosc Structure
The geologic structure of the site consists of a series of northwest-trending synclines and
anticlines. The dip of bedding ranges from about 40 degrees northeastto 60 degrees southwest,
with some overturned beds' in the southern portion of the site. Bedrock units on the site have
variable resistance to weathering and erosion. More resistant sandstone and fossiliferous'
sandstone units locally form laterally continuous outcrops,.
4412-W3
February 1, 2000
Revised'December 21, 2001 20
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INDORPORATF-D:
VII. Geologic Hazards
Slope Instabilt
Earth stability is the GHAD's prime geotechnical concern for which mitigation is required at this
site. This is not unique to these projects, but is of importance for hillside projects throughout the
San Francisco Bay Area. This section describes several types of slope instability that are within
the GHAD's area of responsibility, subject to Section III of this Plan of Control
Landslides are a common geologic phenomenon and are part of the process of mass wasting.
Weathered or fractured bedrock and soil are transported6w'nslope over geologic time as a result'
of gravitational and hydrostatic forces. LandslidesZ
d SVI
ment in this bedrock formation
are typically rotational slumps and earthflows pt I of ement,is typically about 10 to
30 feet below the ground surface. Earthflows are col ned to the upper 3- to 5-foot-thick clayey
soil mantle. In the winter rainy season, thes `.earrtl , can move at a rate of several feet per
day.
A landslide is a deposit of soil and korocl$.moving downward from its original position under
l,.a x
the influence of gravity. Landslid. inclu a variety of morphologies and are further defined by
type of materials, wetness, and mo 93 movement. They can consist of mass movements of
earth materials that are primarily intact, and occur along discrete shear surfaces. These surfaces
(shear or slip planes)' can be rotational (conchoidal or concave), such as for earth;slumps, or
planar, as for translational earth slide or bedrock' block glides. Most landslides are truly
"complex landslides", sliding, falling and flowing with more than one type of movement and/or
material:
Falls are,an abrupt free-fall of earth materials off cliffs, steep cuts, or steep stream banks while
earthflows are mass movements of earth materials in which the type of movement is one of,
4412-W3
February 1, 2000
Revised December 21, 2001 21
ENGCO
INCORPORATED
flowing. When composed of soil finer than gravel size, the flowing material is commonly called
a mudflow. A debris"flow/debris avalanche is composed of natural earth materials, artificial fill,
and/or organic debris that flow downslope with speed. Most of the material is transported away
from the area of initial ground failure.
Soil creep is the slow, often imperceptible, deformation of slope materials under low stress
levels, which normally affects the shallow portion of the slopes, but can be deep seated where a
weak zone of soil or bedrock exists. It results from gravitational and seepage forces, and may be
indicative of conditions favorable for landsliding. Creep can be caused by wetting and drying of
clays, by solution and crystallization of salts, by the growth of roots, by burrowing animals and
by down slope movement of saturated ground. Colluv refers to the mantle of loose soil and
weathered bedrock debris that progresses,down hillsides by'c
%.
As noted in Section III, the CHAD may be cerne ith erosion and sedimentation in open
space areas that affect developed lots or imprtovem Erosion is defined as the process by
der
E.'
which earth materials are loosened and em ked by,running water on the ground surface or in the
,P
subsurface. Sedimentation,is the depos g of settling of soil or rock particles from a state of
suspension in a liquid. ,
Hilly terrain open space, either in a natural condition or particularly on excavated slopes can be
subject to erosion. Landslide deposits, which are sometimes in a loosened condition, are
particularly prone to erosion. Earth flow-, debris flow- and mudflow-type landslides typically
have an area of deposition or accumulation (sedimentation area) at their base. Graded slopes in
the GRAD, particularly those in excess of 20 feet in vertical height or those not.sufficiently
vegetated, are subject to erosion and therefore could be a source of transported sediment.
4412-W3'
February 1, 2000
Revised December 21,2001 22
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Natural ,-processes such as stream cutting and erasion can cause the banks to slump and
oversteepen creek banks. The slumped,material can then be transported downstream. This can
lead to destabilization of areas above the creek banks. In flood stage, streams such as
San Catanio geek can erode even vegetated stream banks,
Slope Stability Considerations
Before grading of the properties, the area within the boundaries of the District generally
consisted of open, rolling, grass-covered hills with scattered trees. Portions of the properties
have been used continuously for 150 years' for cattle grazing. The majority of the natural
hillslopes were in a marginally stable to unstable condi h n Some of the mapped landslides were
located in areas of proposed development. In gei
apral, rifitVing measures for land stability
problems included avoiding large landslide are (W. 4 'placing structures, or stabilizing the
landslides by removing the unstable soil t�hbedrocky constructing engineered keyways, and
in ,
recompacting the soil as drained engineered fi1 �Ano' r technique used was to provide drained
toe-of-slope buttress fills with debris 'benches 5�sufficient width to intercept the potential
landslide'debris.
�1
Debris benches were constructed l' pr ventive measure on many of the perimeter cut slopes
surrounding the development area. Co sistent with the provisions of Section III, the GHAD may
maintain the debris benches and the hillslopes extending uphill from the benches.
Generally, development of this site is concentrated in the low-lying valley areas. Some of these
areas were filled to establish finish grades that are substantially higher than original elevations.
Fill materials for grading were generated from cuts on the surrounding hill slopes. This grading
concept provides pad elevations above flood levels while, at the same time, improves the
4412-W3
February 1, 2000
Revised.December 21, 200'1 23
ENGE0
INCORPORATED
stability of the surrounding natural slopes through the use of buttress fills and flatter slope
gradients.
Known active landslides within the area, which could have been adversely affected by the
grading or which may constitute a threat to the existing or proposed development,,were either
completely removed and replaced as subdrained' engineered fills, buttressed with drained
engineered fills, or isolated from the existing and proposed site improvements by structural
_ means.
A 'project Geologist supervised the development of cuts during grading and, when necessary,
suggested mitigation strategies for unsuspected slo :conditions uncovered during grading
operations that could decrease the slope stability. Sue Cori" ns included unfavorable bedrock
attitudes and seepage conditions. The project Cleolog�t retained by the developer prepared a
geology map for use by the GHAD:
To repair or buttress landslide areas, landslide debris was overexcavated to finn undisturbed'`
materials' below the landslide plane 1, eterrnir"ed by the project Geotechnical Engineer or
Engineering Geologist at the tine of graing >In the case of the complete removal of a landslide,
systems of surface and subsurface"dinsere'to be installed to collect the subsurface waters that
could have initially caused the landslr e. The configuration of each subdrainage system was
tailored to the individual landslide at the time of grading. The Geotechnical Engineer and/or the
Engineering Geologist determined the location and depths of subdrains at that time. A Licensed
Land Surveyor was retained to record the location and elevation of subdrains and subdrain
outlets. Each landslide subexcavation was reconstructed:to final`grade by keying and benching
below the landslide plan with a compacted drained engineered fill.
4412-W3
February 1, 2000
Revised December 21, 2001 24
EAGEO
INCORPORATED'
Landslides not completely removed were either stabilized in place, or were situated outside of
proposed development areas. Buttress fills were constructed at the toes of major cut slopes near
the base of known 'landslide areas, or will be addressed during foundation review and lot
development., These'fills consisted of drained-engineered keyways, excavated to firm bedrock,
with an overlying engineered fill. Debris benches were constructed with concrete-lined ditches
discharging into approved outlets.
It is important to note that to preserve the natural topography, wildlife habitat,,and vegetation of
the site, only those landslide masses that directly threatened the planned improvements were
stabilized. In some cases additional landslide masses may be required to be stabilized during
foundation review and development on individual lots lope instability in open-space areas and
on agricultural parcels, which did not have the potential to ". ctly affect home saes, roadways,
or other improvements,were not repaired.
Efforts were made during the mass grading ods atois to maintain the creek corridors crossing
the property in their natural conditio Greek erosion that did not directly threaten site
improvements, as defined in Section litho eas otGHAID Responsibility, were, in general, not
repaired. The intent was to allthe cru s tdomature naturally.
4412-W3
February 1, 2040
Revised December 21 2001 25
!114.E0
INCORPORATED
VIII. Geotechnical Techniques for Mitigation of Landslide and Erosion Hazards
The techniques the CHAD may employ to prevent, mitigate or abate landsliding or adverse
erasion damage might include,but are not necessarily limited to:
A. Removal of the unstable earth mass.
B. Stabilization (either partial or total) of the landslide by removal and replacementwith
compacted drained fill'.
C. Construction of structures to retain or divert landslide material or sediment.
- D. Construction of erosion control devices such a 4 gabions, rip rap, geotextlles, or lined
ditches.
E. Placement of drained engineered buttress fix
F. Placement of subsurface drainage devics, e g un.,erdrains,or horizontal'drilled drains.
G. Slope correction (e.g.;gradient chase, btplechnical stabilization, and slope trimming or
contouring). _ `
3"'� a
H. Construction of additional s e` d.chesand/or detention basins, silt fences, sediment
traps, or backfill or erosio charm
Potential:'landslide and erosion hazar' an best be mitigated by controlling soil saturation and
water runoff and by maintaining the surface and subsurface drainage system. Maintenance,,shall'
be provided for lined-surface drainage ditches and drainage terraces including debris benches or
drop inlets.
As noted in Sections II and III Of this Plan of Control, maintenance of open-space areas by others
(the HOA's), including the clearing of fire trails, is subject to review, approval and,oversight of
the CHAD. Any proposed physical construction, maintenance or repair activities (except for
general 'maintenance such as weed abatement, trail maintenance and fire control) in HOA
4412-W3
February 1,2000
Revised December 21,2001 26
ENGEO
INCORPORATED
maintained open space areas may be subject to the review and approval of the CHAD, consistent
with the governing documents of those associations.
4412-W3
February 1, 2000
Revised December 21, 2001 27
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INCORPORATED
IX. Biotechnical `''Recommendations for Prevention and Mitigation; of Existing or
Potential Erasion Hazards
Fill slopes within the boundaries of the District are expected to be erodible as will cut slopes in
bedrock, therefore the maintenance of'vegetative cover is especially important. Vegetation
provides a protective role on soil and exposed rock. it absorbs the impact of raindrops, reduces
the velocity of runoff, and retards erosion.
In many instances, adequate erosion protection for slopes can be accomplished with carefully
selected and placed biological elements(plants) without the use of structures (e.g.brush layering
and willow waddling):
In other areas, biotechnical slope protection may involve ib%j se of mechanical elements or
structures in combination with biological elemensl, " provide erosion control and help prevent
small-scale slope failures. Locally, crib wa ' ded e walls, gabion walls, rock walls, rip
rap, and reinforced ,earth walls used co' dation with carefully selected'` and planted
vegetation can provide high quality sl e prgteeto#t The vegetation may be planted on the slope
above a low retaining structure or.1 E a1 or the interstices of the structure can be planted.
4412-W3
February 1, 20003
Revised December 2'1, 2001 28
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INCORPORATED
X. Maintenance and Monitoring Schedule
Geologic features and CHAD maintained facilities should be 'inspected on a regular basis.
Budget permitting, inspections should be scheduled to occur a minimum of three times per year
in normal years and four or more times per year in years of heavy rainfall'. The inspections
should be scheduled to take place in October, prior to the first significant rainfall; mid-winter as
necessary during heavy rainfall years; and in early April at the end of the rainy season. The
frequency of the inspections should be increased in years of higher than-average rainfall intensity
and/or recurrence. Figures 7 and 8 are the field verified'Geologic Maps for the Wiedemann
Ranch and Presley Henry Ranch projects. The grading Testing and Observation Reports for each
of the sites shall be kept on file in the records of the G
v(�O_
Geotechnical Resources
A GRAD 'Engineer and/or Geologist sho to,ins `ect the lined surface of concrete-lined
drainage ditches within the CHAD b0t. an ;an"a regular schedule. If possible, inspections
should be scheduled for twice eao``years budg6�permitting. One inspection.should be in the
fall prior to the on set of winter` The inspector should check for sedimentation,
cracking or shifting of the, ltd ditches. Repairs and maintenance should be
performed on a regular sch le. E ess silt or sediment in ditches should be removed and
cracked or broken ditches sho ,be etched or repaired as required'before the beginning of
the next rainy season.
• Subsurface drain outlets and horizontal drilled drain outlets should be inspected on a regular
schedule. Water flowing from these outlets should be measured and recorded during each
inspection. If possible, inspections should be scheduled twice each year, preferably in the
fall and spring. Any suspicious interruption in flow should signal a need to unplug or clean
by flushing the affected drain;
• Piezometers used to measure,groundwater levels, or other instruments such as inclinometers
and tiltmeters should be monitored on a regular schedule.
4412-W3
February 1, 2000'
Revised December 21, 2001 29
EEO
INCORPORATED
• Settlement monitoring devices should be monitored on a regular schedule. In the event of
anomalous readings or excessive settlement, the monitoring frequency should be increased'.'
• Inlets, outfalls or trash racks, if used, must be kept free of debris and spillways maintained.
Attention should be given to plantings or other obstructions,which may interfere with access,
by power equipment.
•. The portions of the creek corridor that are maintained by the GHAD.should be inspected on'a
regular basis — ideally at least twice a year. One inspection should be in the fall prior to the
onset of winter rains. A second inspection should be undertaken during the rainy season to
monitor potentialcreek bank failures that could imminently threaten or damage site
improvements. The maintenance program should include the monitoring of the subdrain
outfalls from the mass grading operations which outlet to the creek in a number of locations
along the creek bank.
The GRAD should review its inspection schedule ally and assess the effectiveness of its
preventive maintenance program' on a regular bass. GA" staff should prepare an annual
report to the Board of Directors with recommen tJo r for maintenance and/or repair projects.
Consultants, if necessary, may be retame uncle, e the needed' studies. The District
Engineer and/or Engineering Geologist retaine th`e SHAD shall prepare an annual inspection
5
report for presentation to the GHAD bard o Directors.
Biological Resources
• At a;minimum, the CHAD should retain a qualified Biologist to perform'annual inspections,
of the protected resources. Other professionals, such as Civil Engineers and Geotechnical'
Engineers, may be involved as necessary.
• In order to control potential California red'-legged frog predators (specifically, bullfrogs) the
GHATS Biologist will ensure that the mitigation'wetland ponds are dried downn during the
early fall months on an annual basis (as necessary). These ponds are designed to dry down:
on their own during most rainfall years.
4412-W3
February 1, 2000
Revised December 21, 2001 30
EAGEO
INCORPORATED
In order to ensure that resources are adequately protected from encroachment, the GHAD
Biologist will ensure that fences surrounding mitigation;.wetlands and enhancement areas are
maintained, repaired and/or replaced as necessary.
+ GHAD Biologist will ensure that the wetland mitigation ponds retain their functional and
structural integrity. This may require removal of sediment, repair of debris flows/landslides,
repair or reinforcement of the earthen berms, and replanting as necessary.
,
r
4412-W3
February 1, 2000
Revised December 2'1, 2001 31
EIVOE
INCORPORATED
SELECTED REFERENCES
Aliquot, 1996, Grading Plan Subdivision 7575, 7578, 7996, and 7998; Contra Costa, California,
March 1998, scale 1 inch == 40 feet, Aliquot Planners, Civil Engineers Surveyors,
San Ramon, California.
Alpha Geotechnical Consultants, Inc., 1987, Preliminary Geologic Study --- Proposed
Subdivision, Wiedemann 'Ranch, Contra Costa and Alameda Counties, California;
February 27, 1987.
Association of Bay Area Governments (ABAG), 1981, Manual of Standards for Erosion and
Sediment Control Measures.
Axelrod, D. I., 1944a, The Back Hawk Ranch Flora, in Pliocene Floras of California and Oregon,
R. W. Chaney, ed. Carnegie, Inst. Washington Pubieation No. 553: 91-101, 2 pls.
Axelrod, D. I., 1944b, The Pliocene Sequence in Cen Il C omia. Ibid.: 207-224, 1 Fig., 1 tab.
�Rb
Bonilla, M. G'., 1982, Evaluation of Potential Sutface Faulting and Other Tectonic Deformation,
USGS'Open-File Report 82-732.
Borcherdt, R. D., J. F. Gibbs, and R Lajoie, IOV5,'Prediction of Maximum Earthquake Intensity
in the Southern San Francisco , re&n, California, for larger Earthquakes on the
San Andreas and Hayward Faults,USGS M 709.
Brabb, E. E., H. S. Sonneman, Switzer, Jr., 1971, Preliminary Geologic Map of the
Mount Diablo-Byron Ara, Con tr Costa, Alameda and San Joaquin Counties, California:
U.S. Geol.Survey Basic DA Ca 28, scale 1:62500.
29
"_P
Brabb, E. E., H. S. Sonneman, and J. R. Switzer, Jr., 1974, California Oil and Gas Fields, 1974,
Vol. 11, South Central Coastal and Offshore California: Cala Div. Oil and Gas, Report. n,
Tr. 12.
California Division of Mines and Geology, January 1, 1982, State of California Special Studies
Zone, Diablo 7-%2' Quadrangle.
California Division of Mines and Geology, January 1, 1982, State of California Special Studies
Zone, Dublin 7-1/2' Quadrangle.
California Division of Mines and Geology, January 1, 1982, State of California Special Studies
Zone, Hayward 7-1/2' Quadrangle.
4412-W3
February 1, 2000
Revised September 1, 2001
EAGEO
INCORPORATED
SELECTED REFERENCES (Continued)
Clark, M. M., 1980, Ground Rupture and Seismic Shaking as Separate Hazards of Active Faults
(A Study of Active Faulting in the Ojai Valley, Southern California), in Proceedings of
the Eighteenth Annual Engineering Geology and Soils Engineering Symposium.
Contra Costa County, 1975, Seismic Safety Element, Technical Background Report.
Crane, Ron and Craig Lyon, 1995, Geology of the Mount Diablo Region Field Trip Guidebook:
Northern California Geological Society, Diablo 7-%2' Quadrangle, Scale 1:24,000.
Darrow, R. L., 1976,Mount Diablo Segment of the Meganos Channel: in: Keith Drummond, ea.,
Pac. Secs. A.A.P.G.-S.E.G.S.E.P.M. Joint Annual Field Trip San Francisco,
April 24, 1976,p. 2533.
Davenport, C. W., 1986, Landslide Hazards in Parts o e Diablo and Dublin,7-%z'Quadrangles,
Contra Costa County, Cal ornit , CDMG Open-File Report 86-7 SF.
Dibblee, T. W. Jr., 1980, Preliminary Geolog o4mi""ap-6f the Diablo Quadrangle, Alameda and
Contra Costa Counties, California, USGS (Opa File Report 80-546.
Dibblee, T. W. Jr., 1980, Preliminary Geologic Map`"off the Diablo 7-%' Quadrangle, Alameda
and Contra Costa Counties, Ca4%,rnia f. U.S. Geological" Survey Open File Report
80-537.
Dibblee, T. W., Jr., 1980, Prelimi �u p, 0# Map of the Hayward 7-%' Quadrangle, Alameda
and Contra Costa Coes, Ca:1lornia: U.S. Geological' Survey Open File Report
80-540.
Dibblee, T. W., Jr., 1980, Preliminary Geologic Map of the Las Trampas Ridge 7-%2'
Quadrangle, Alameda and Contra Costa Counties, California, U.S. Geological Survey
Open File Report 80-545.
Graham, S. A., C. Gavigan, C. McCloy, M. Hitzman, R. Ward, and R. Turner, 1983, Basin
Evolution during the change from convergent to Transform Continental Margin: An
Example from the Neogene of Central California, in Field Trip Guidebook, Pacific
Section SEPM, May 1983.
Gaymer, R. W., D. L. Jones and E. E. Brabb, 1994, Preliminary Geologic Map Emphasizing
Bedrock Formations in Contra Costa County, California, Open-File Report 94-622.
4412-W3
February 1, 2000
Revised December 21,2001
EAIGEO
INCORPORATED
SELECTEDREFERENCES(Continued)
Harlan Tait Associates, 1996, Geotechnical Investigation, Subdivisions 7575, 7578, 7996 and
7998, Contra Costa County, California; prepared for HCV and Associates, Ltd.,
July 25, 1996.
Harlan Tait Associates, 1995, Geotechnical'Feasibility Investigation, Water Tanks 1, 2, 3 and 4,
Wiedemann Ranch Residential Community, Contra Costa County, California; prepared
for HCV Partners, December 11, 1995, Revised October 24, 1995.
Hart, 1981, Fault Evaluation Report 110, Diablo Quadrangle, C.D.M.G. unpublished report.
Helley, E. J., and D. G. Herd, 1977, Faults with Quaternary Displacement, Northwestern
San Francisco Bay Region, California, USES MF 818.
Herd, E. G., 1977, Geologic Map of the Las Positas, Greenville and Verona Faults, Eastern
Alameda County, California: U.S. geology sury Open-File Report 77-689, 25 p.
Herd, E. G., 1978, Map of Quaternary Faulting Along the". orthern Calaveras Fault Zone:
Las Trampas Ridge, Diablo Dublin, Nf s 4'd La Costa 7/2-minute Quadrangles,
California, Sheet 1 USGS Open-File Report�l -307.
v
HTA, 1990, Geotechnical Feasibility Investigat,on, i iemann Ranch, San Ramon, California:
prepared for HCV Pacific Part TO� -Aust 8, 1990 (revised February 8, 1991), HTA
Project No. 1007.022.
Lawson, A. C., 1914, Description NS'At 'rancisco District: U.S. Geol. Survey Atlas, Folio
193, 24 p., scale 1:6250 . g '
Limerinos, J. T., J. S. Lee, and P. o, 1975, Flood Prone Areas in the San Francisco Bay
Region, USGS Open-File Report(Water Resources.Invest 37-73).
Majmundar, H. H., 1996, Landslide Hazards in the Las Trampas Ridge Quadrangle and Parts of
the Diablo Quadrangle, Alameda and Contra Costa Counties, California, California
Division of Mines and Geology OFR 95-15.
Nilsen, T. H., and S. H. Clarke, Sedimentation and Tectonics in the Early Tertiary Continental
Borderland of Central California: U.S. Geol. Survey Prof. Paper 925, 64 p.
Norcal Geophysical Consultants, Inc., 1994 Seismic Refraction Survey, Wiedemann Ranch
Residential Community, San Ramon, California, December 20, 1994, Norcal
Geophysical Consultants, Petaluma, California.
4412-W3
February 1, 2000
Revised December 21, 2001
EJ E0
INCORPORATED
SELECTED REFERENCES (Continued)
Pacific Aerial Surveys,July 2, 1987, Aerial Photographs AV-3110-11 to 13, 24 to 11, 3-1 to 10,
4-1 to 8.
Pacific Aerial Surveys, April 17, 1998, Aerial Photographs San Ramon KAV 5783 1-1 to 1-6,
2-1 to 2-6, 3-1 to 3-6, 4-1 to 4-6, 5-1 to 5-6, and 6-1 to 6-6.
Pampeyan, E. H., 1963, Geology and Mineral Deposits of Mount Diablo, Contra Costa County,
California: California Division of Mines and Geology Special Report 80, 31 p., 5 pls.
Richey, K. A., 1938, Osteoborus Diabloensis, a new dog from the Black Hawk Ranch fauna,
Mount Diablo, California. The Cordon,24: 303-308, 1 Figure.
Richey, K. A., 1948. Lower Pliocene Horses from ,Black Hawk Ranch, Mount Diablo,
California. Ibid., 28: 1-44, 3 pls., 13 figs.
Rogers, J. D., 1986, Landslide Processes of the E90"Bay 14 4k%,and San Francisco Bay Region,
California, AEG Field Trip Guidebook, Ial Meeting.
Sarna-Wojicki,`A. M., 1976, Correlation of �Qnozoq Tuffs, in the Central Coast Ranges of
California by Means of Trace — and Mi or�Ytlment Chemistry: U.S. Geologic Survey
Professional Paper 972, 30p � ..
Saul, R. B., 1967, The Calaveras Faulxi one in` Contra Costa County, California, California
Division of Mines and Go,'. in I Information Service; Volume 20, Number 3.
Savage, E. E., B. A. Ogle, and S
g freely, 1951, Subdivision of Vertebrate-Bearing Non-
Marine Pliocene Rocks in `'Central Contra Costa County, California. Geologic
Society',America Bulletin, V. 62.
Savage, E. E., B. A. Ogle, and R. S. Creely, 1955, Nonmarine Lower Pliocene Sediments in
California, A Geochronologic-Biostratigraphic Classification, Ibid., 31: 1-26, 13 figures.
Savage, E. E., B. A. Ogle, and R. S. Creely, 1982, Stratigraphy of Upper Tertiary, Nonmarine
Rocks of Central Contra Costa Basin, California, in SEPM-Cenozoic Nonmarine
Deposits of California and Arizona.
State of California, Department of Conservation, 1987, Erosion and Sediment Control
Handbook, EPA 440/3-78-003.
441.2-W3
February 1, 2000
Revised December 21, 2001
EAIGEO
INCORPORATED
SELECTED REFERENCES (Continued)
Sycamore Associates LLC, 1998, Final Wetland and Red-Legged Frog Biological Mitigation
Plan, Henry Ranch, San Ramon, Contra Costa County,California.
Taff, J. A., 1935, Geology of Mount Diablo and Vicinity: Geol. Soc. America Bull. v. 46,
p. 1029-1100, map.
Varnes, D. J., 1978, Slope Movement Types and Processes, in Landslides, Analysis and Control,
Special Report 176, Transportation Research Board.
Wagner, J. R., 1978, Late Cenozoic History of the Coast Ranges East of San Francisco Bay,
Unpublished Ph.D., U.C. Berkeley.
Wentworth, C. M., S. Ellen, V. A. Frizzell, Jr., and J. Schlocker, Map of Hillside Materials and
Descriptions of their Engineering Character, San Mateo County, California, USES
Miscellaneous Investigation Series Maps 1-127
J;
Wesnousky, 1986, Earthquakes, Quaternary Faults, and SeisniiHazard in California, Journal of
Geophysical Research, Vol. 91 No. B 12. _�",
414
4412-W3
February 1, 2000
Revised December 21, 2001
Jill
EEO
INCORPORATED
APPENDIX.A
Figure 1 Limits of Wiedemann Ranch
Figure 2 Limits of Presley Henry Ranch Project
Figure 3 Detention Basins to be Maintained by
GHAD—Wiedemann Ranch
Figure 4 Mitigation Ponds to be Maintained by
CHAD--Presley Henry Ranch Project
Figure 5 Grading Plan.—Wiedemann Ranch
Figure 6 Groing Plan—Presley Henry Ranch Project
Figure 7 Site Geole' p Map—Wiedemann Ranch
Figure 8 Ste Geologic Map—Presley Henry Ranch
ProAv
Figure 9 Open Space Within Presley Henry Ranch
Project
ExI, Legal Description--Wiedemann Ranch
Exhi tat B Legal Description--Presley Henry Ranch
O Project
4412-W3
February 1,2000
Revised December 21, 2001
1 p�
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LnWTS OF WEDEMANN RANCH
PROJEG!' No!4412-W3 l "=1400 '
ALIQUOT PRESLEY HENRY RANCH CHAD ANNEX
PLANNERSDATE: FEBRUARY 2MI
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LEGAL DESCRIMON w`WIEDEMANN RANCH PROJEa No-4412-W3 MUNIT
PRESLEY HENRY RANCH GHAD ANNEX DAm- FEBRUARY 2000 A
CONTRA COSTA-COLINTY.CALUPORNIA
ALL OF PARCEL C, SUBDIVISION MS 108-86 (133 PM 8); ALL OF PARCELS "A",
"B", "C"AND "D", SU13DIVISION NIS 135-74 (41 PM 21) PORTION OF LOTS 1 &
2; ALL OF LOTS 3 AND 4; PORTION OF THE SOUTHWEST /d OF THE
NORTHWEST ;«; TI IF WEST !/2 OF THE SOUTHWEST t/a; THE SOUTHEAST '/a OF
THE SOUTHWEST 1,4'; ALL IN SECTION 21 TOWNSHIP 2 SOUTH RANGE l
WEST, MOUNT DIABLO BASE AND MERIDIAN; LOTS 1 AND 2; PORTION OF
THE SOUTHWEST 1.4 OF THE NORTHEAST 1/A, THE WEST 'l2 LYING WITHIN
CON'T'RA COSTA COUN'T'Y; ALL IN SECTION 28 IN TOWNSHIP 2 SOUTH,
RANGE I WEST, MOUNT DIABLO BASE AND MERIDIAN; ALL IN CONTRA
COSTA COUNTY, CALIFORNIA DESCRIBED AS FOLLOWS:
BEGINNING ATTHE MOST SOUTHWESTERN CORNER OF SAID PARCEL "C"
(133 PM 8); THENCE FROM SAID POINT OF BEGINNING ALONG THE
WESTERN LINE OF SAID PARCEL "C' (133 PM 8)NORT14 11'53'58" NEST
1668.00 FEET TO THE MOST NORTHWESTERN CORNER OF SAID PARCEL "C"
(133 PM 8) SAID POINT BE,ING AT 'i HE SOUTHERN RIGHT OF WAY LINE OF
NORRIS CANYON ROAD (133 PM 8); THENCE ALONG THE NORTHWESTERN
LINES OF SAID PARCEL "C" (133 PM 8) AND ALONG THE SOUTHERN RIGHT
OF WAY LINE OF SAID NORRIS CANYON ROAD THE FOLLOWING NINE
(9)COURSES: 1)NORTIT 50°23'07" EAST 17.34 FEET; 2) ALONG THE ARC OF A
867.00 FOOT RADIUS CURVE TO THE RIGHT THROUGH A CENTRAL ANGLE
01` 24`23'43" AN ARC_". DISTANCE OF 369.15 FEET; 3) NORTJ 174146'50" EAST"
54.46 FEET-, 4) ALONG THE ARC OFA 233.00 FOOT RADIUSCURVE TO THE
LEFT THROUGH A CENTRAL. ANGLE 18040'19" AN ARC DISTANCE OF 75.93
FEET; 5) NORTH 56'06"31" LAST 198:33 FEET; 6) ALONG THE ARC OF A 333.00
FOC}T .RADIUS CIJRVI~ TO 'ITE LE T T HROUGII A CENTRAL ANGLE OF
31'2553" AN ARC DISTANCE' OF 182.68 FEET; 7) NORTH 24°40'38" EAST" 27.60
FEET; 8) ALONG T"HE ARC OFA 167,00 FOOT RADIUS CURVE TO THE RIGHT
THROUGH A CENTRAL ANGLE OF 3104658"AN ARC DISTANCE OF 92.64 AND
9) NORTH 56°27'36" EAST 457.37 FEET TO THE MOST NORTHERN CORNER OF
SAID PARCEL "C" (133 PM 8); THENCE LEAVING SAID SOUTHERN RIGHT OF
WAY LINE OF NORRIS CANYON ROAD ALONG THE NORTHERN LINE OF
SAID PARCEL "C" (133 Plot 8) SOUTH 89°27'34" EAST 860.17 FEET TO T14E
MOST NORTHEASTERN CORNER OF SAID PARCEL "C" (133 PM 8); THENCE
ALONG THE EASTERN LINE OF SAID PARCEL°`C" (133 I'M 8) SOUTH 00031'00"
WEST 2188.56'FEET TO THE MOSTSOUTHEASTERN CORNER OF SAID
PARCEL "C" SAID POINTBEING ONTHE NORTHERN LINE OF SAID PARCEL
"D" (41 PIM 21); THENCE ALONG SAID NORTHERN LINE NORTH 80058'36"
EAST 2626,09 FEET"TO THE MOST NORTHEASTERN CORNER OF SAID
PARCEL`°D" (41 I'M 21);THENCE ALONG THE NOR`L"1-TERN LINE OF SAID LOT
I OF SECTION 21 SOUTH 89004'30" EAST 450.00 FEET; THENCE LEAVING SAID
NORTHERN LINE SOUTH 25052'49"EAST 1001.89 FLET; THENCE SOUTH
02049'3 8" WEST405.49 izn'1; TIIENCE NORTH 80°29'39" WEST 486.01 ITE ET;
THENCE SOUTH 21038'18" WEST 87.54 FEET; THENCE SOUTH 15°41'38" 'WEST
86.27 FEET; THENCE SOUTH 09045'47" WEST 87.11 FEET THENCE SOUTH
03049'07 '
WEST86.63 DEET; THENCE SOUTH 02016'04"EAST 86.26 FEET;
"
THENCE SOUTH 05048'40" FAST 165.75 FEET; THENCE SOUTH 55019'06" EAST
27.31 FEET; THENCE NORTH 79'10'48" EAST 322.68 FRET; THENCE SOUTH
07"10'27" EAST 279.18 FEET; THENCE SOUTH 24'03'54" WEST 257.83 FEET;
THENCE SOUTH 82015'30" WEST 219.38 FEET; THENCE SOUTH-70°18'45"
\�,`EST 56.43 FEET; THENCE SOUTH 13'41'29" WEST 157.23 FEET; THENCE
SOUTH 41005'133" EAST` 227. 32 FEET; THENCE NORTH 81'33'03" EAST 1125.71
FEET; 'ITIENCE SOUTH 59057'40" EAST 624.93 FEET; THENCE SOUTH 29109,25"
EAST 543.92 FEET; THENCE NORTH 63'15'52" EAST 349,08 FEET,T0 A POINT
ON THE RANCHO SAN RAMON WESTERN BOUNDARY LINE; THENCE ALONG
SAID RANCI-10 LINE SOUTH 2604252" EAST 5515.03 FEET TO THE MOST
SOUTHEASTERN CORNER OF SAID LOT 2 OF SECTION 28; THENCE ALONG
THE SOUTHERN LINE, OF SAID LOT 2 NORTH 87"57'05" WEST 2666,34 FEET TO
A POINT ON THE EASTERN LINE OF SAID WEST 1/2 OF SECTION 28; THENCE
ALONG SAID EASTERN LINE SOUTH 00`01'121" WEST 406.18 FEET TO A POINT
ON THE EASTERN LINE OF ALAMEDA COUNTY; THENCE ALONG SAID
EASTERN LINE, Tl IE FOLLOWING FOUR (4) COURSES: 1)NORTH 80032'34"
"WEST 289.68 FEET; 2) NORTH 78150'02" WEST 56.11 FEET; 3)NORTH 68'07'50"
WEST 22.44.19 AND 4) NORTH 46.17'50" WEST 251.29 FEET TO A POINT ON
THF 'VESTERN LINE OF SAID SECTION 28; THENCE ALONG THE SAID
WESTERN LINE, NORTH 0004853" EAST 2005.99 FEET TO THE MOST
NORTHWESTERN CORNER OF SAID SECTION 28 SAID POINT BEING THE
MOST SOUT14EASTERN CORNER OF SAID PARCEL D (41 PM 21); THENCE
ALONG THE WESTERN AND NOl;UFHERN LINES OF SAID PARCEL "D" (41 PM
21) THE FOLLOWrNG SEVEN (7) COURSES: 1) SOUTH 82007'42" WEST 1876.08
FEET; 2)NORTH 46*17'50" WEST 497,78 FEET; 3)NORTH 87'05'45" WEST 419.25
FEET, 4) NORTH 01'34'46" EAST 2158.90 FEET; 5) SOUT14 81145'00" WEST
2705,98 FEET; 6) Nowri-i 02'42'27" EAST 2604,71 AND 7) NORTH 81022'40" EAST
947.56 FEET TO THE POINT OF BEGINNING AND CONTAINING 1,063.00 ACRES
OF LAND MORE OR LESS,
88074,8
GILA.D BOUNDARY
LEGAL DE.SCRTnON-PRESLEY HENRY RANCH PROJECT PROJECT NO.:4412-W3 EMBIr
PRE;SLLY HENRY PLANCK OHA7D ANNEX DATE: FPBIcCTARY 2{)()v
CONTRA COSTA COUNTY CAT UMORNIA
SUBDIVISION 8188 -D.S.R.S.D.
REAL PROPERTY •IN AN UNINCORPORATED AREA, COUNTY OF CONTRA- COSTA, STATE OF
CALIFORNIA, DESCRIBED AS FOLLOWS:
BEING A PORTION OF THE RANCHO SAN RAMON, DESCRIBED AS FOLLOWS:
BEGINNING AT A POINT ON THE MOST SOUTHWESTERLY RIGHT OF WAY LINE OF SAN RAMON
VALLEY BOULEVARD AS IT NOW EXISTS AT THE INTERSECTION WITH THE MOST EASTERLY PORTION
OF THE COMMON LINE AS DESCRIBED IN THE DEEDS TO HENRY RECORDED MARCH 1, 1948, IN
BOOK 1177, AT PAGE 405 AND RECORDED MARCH 13, 1954, IN BOOK 2441, AT PAGE 432, CONTRA
COSTA COUNTY RECORDS, SAID POINT ALSO BEING ON THE EXISTING SAN RAMON CITY LIMIT LINE;
THENCE, ALONG SAID RIGHT OF WAY LINE AND CITY LIMIT LINE, SOUTH 28° 59' 05"EAST 658.42
FEET TO A POINT ON THE MOST NORTHWESTERLY LINE OF THE PARCEL OF LAND DESCRIBED AS
'EXCEPTING THEREFROM.-' IN SAID HENRY.DEED (1]77 OR 405);
THENCE, LEAVING SAID RIGHT OF WAY LINE AND ALONG THE MOST NORTHWESTERLY
AND
SOUTHWESTERLY LINES OF SAID PARCEL 'EXCEPTING THEREFROM.• (1177 OR 405), THE FOLLOWING
COURSES, SOUTH 62° 57' 54" WEST 277.50 FEET;
THENCE, NORTH 220 54' 10" WEST, 29.86 FEET
THENCE, SOUTH 630 06' 32" WEST, 414.92 FEET
THENCE, SOUTH 34°53'08"EAST, 131.51 FEET TO A POINT ON THE MOST SOUTHEASTERLY LINE OF
SAID HENRY DEED (1177 OR 405);
THENCE, ALONG SAID SOUTHEASTERLY LINE (1177 OR 405), SOUTH 64° 42' 5211 WEST 1326.61 FEET
TO AN ANGLE POINT ON THE SAID EXISTING SAN RAMON CITY LIMIT LINE,
THENCE, LEAVING SAID EXISTING SAN RAMON CITY LIMIT LINE AND CONTINUING ALONG THE SAID
MOST SOUTHEASTERLY LINE(1177 OR 405),:SOUTH 64°42'52" WEST, 339.64 FEET TO A POINT ON THE
MOST SOUTHWESTERLY LINE OF THE PROPOSED SUBDIVISION 8188 AS SHOWN ON THE VESTING
TENTATIVE MAP SUBMITTED TO AND ACCEPTED BY THE CITY OF SAN RAMON,
THENCE, LEAVING SAID SOUTHEASTERLY LINE (1177 OR 405), ALONG THE MOST SOUTHWESTERLY
LINE OF THE PROPOSED SUBDIVISION 8188, THE FOLLOWING COURSES, NORTH 240 22' 33" WEST
331.56 FEET TO A POINT OF NON-TANGENCY;-
THENCE,
ON TANGENCYTHENCE, SOUTHWESTERLY, WESTERLY, NORTHWESTERLY AND NORTHERLY, ALONG THE ARC OF A
NON-TANGENT CURVE, CONCAVED NORTHEASTERLY THE RADIUS POINT OF WHICH BEARS NORTH
240 22'53" WEST, HAVING A RADIUS OF 45.00 FEET, DELTA OF 1050 13'31 A LENGTH OF 82.64 FEET
TO A POINT OF NON-TANGENCY,•
THENCE, SOUTH 83° 41' 15" WEST, 405.00 FEET;
THENCE, NORTH 57° 39' 49" WEST 607.09 FEET;
THENCE, NORTH 25"12'25 WEST, 481.98 FEET TO A POINT ON THE MOST NORTHWESTERLY LINE OF
SAID HENRY DEED (2441 OR 432);
THENCE, LEAVING LAST SAID MOST SOUTHWESTERLY LINE OF PROPOSED SUBDIVISION 8188 AND
ALONG SAID MOST NORTHWESTERLY LINE (2441 OR 432), NORTH 64°47'35"EAST 1070.12 FEET TO
AN ANGLE POINT ON THE EXISTING SAN RAMON CITY LIMIT LINE
THENCE, ALONG THE SAID EXISTING SAN RAMON CITY LIMIT LINE AND CONTINUING ALONG SAID
NORTHWESTERLY LINE (2441 OR 432), NORTH 64°47'35"EAST, 1919.86 FEET TO THE SAID EXISTING
MOST SOUTHWESTERLY RIGHT OF WAY LINE OF SAN RAMON VALLEY BOULEVARD;
THENCE, ALONG SAID RIGHT OF WAY LINE, SOUTH 28° 59' 05"EAST 735.82 FEET TO THE POINT
OF BEGINNING.
THAT PORTION OF THIS DESCRIPTION WHICH CALLS 'ALONG THE MOST SOUTHWESTERLY LWE OF
THE PROPOSED SUBDIVISION 8188" WHICH SHALL ULTIMATELY AGREE WITH THE SUBDIVISION
BOUNDARY LINE THAT WILL BE ESTABLISHED UPON THE EVENTUAL FILING OF THE FINAL MAP FOR
SUBDIVISION 8188.
BEARING AND DISTANCES ARE BASED ON THE CALIFORNIA COORDINATE SYSTEM, NAD 27, ZONE 3.
TO OBTAIN GROUND DISTANCES, MULTIPLY BY 1.0001044.
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