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TO: BOARD OF SUPERVISORS,AS BOARD OF
DIRECTORS FOR THE CALIFORNIA TRADEWINDS •`�
CostaGEOLOGIC HAZARD ABATEMENT DISTRICT
FROM: JULIA R. BUEREN, PUBLIC WORKS DIRECTOR County
DATE: August 19, 2008
SUBJECT: ADOPT Resolution No. 2008/*** fixing a hearing for September 16, 2008 at 9:30 a.m., to consider
the Petition for Annexation and the proposed First Amendment to California Tradewinds GHAD Plan
of Control, Bay Point area. (Tradewinds GHAD Funds) (District V)Project No.: 7821-6X5046
SPECIFIC REQUEST(S)OR RECOMMENDATION(S)&BACKGROUND AND JUSTIFICATION
RECOMMENDED ACTION:.
1. ACCEPT Petition for Annexation of the Sea Breeze II subdivision into the existing California Tradewinds
Geologic Hazard Abatement District ("GHAD");
2. ACCEPT the proposed First Amendment to California Tradewinds GHAD Plan of Control;
3. ADOPT the attached Resolution No. 2008&fcfAo do the following:
CONTINUED ON ATTACHMENT: D SIGNATURE:
RF.COiVAfENDATION OFCOUNTY ADMINISTR4TOR RECOMMENDATION OF BOAR COMMITTEE
APPROVE OTHER
SIGNATURE(S):
ACTION OF BOARD ON Ili -61.04 APPROVED.AS RECOA4 DED ✓ OTHE
VOTE OF SUPERVISORS: I HEREBY CERTIFY THAT THIS IS A TRUE AND CORRECT
COPY OF AN ACTION TAKEN AND ENTERED ON
UNANIMOUS(ABSENT ) MINUTES OF THE BOARD OF SUPERVISORS ON THE
AYES: NOES: DATE SHOWN.
ABSENT: ABSTAIN:
Contact: Warren Lai(313-2022)
HH:st
G:\SpDist\Board Orders\2008\Board Orders 8-19-08\Seabrceze 11 Accept the ATTESTED
Petition.doc JOHN CULL ,CLERK OF THE BOARD OF
SUPERVISORS
cc: Assessor
Conservation and Development
County Counsel
Engineering Services BY: DEPUTY
Tradewinds GHAD Manager —�
Hillary Heard,Special Districts
SUBJECT: ADOPT Resolution No. 2008/*** fixing a hearing for September 16, 2008 at 9:30 a.m., to
consider the Petition for Annexation and the proposed First Amendment to California
Tradewinds GHAD Plan of Control, Bay Point area..(Tradewinds GRAD Funds)(District V)
Project No.: 7821-6X5046
DATE: August 19, 2008
PAGE: 2 of 3
RECOMMENDED ACTION: (continued)
(a) FIX a Public Hearing for September 16, 2008 at 9:30 a.m. in Room 107 of the Board of Supervisors'
Chambers,651 Pine Street,Martinez,California,to consider the proposed annexation of territory into the
existing California Tradewinds GRAD and the proposed First Amendment to California Tradewinds
GHAD Plan of Control, and to hear any written objections thereto; and
(b) DIRECT the Public Works Director,or her designee,to mail,by first class mail,a written notice of the
hearing to consider the proposed.annexation and the proposed First Amendment to California
Tradewinds GRAD Plan of Control to each owner of real property proposed to be annexed to the
California Tradewinds GHAD and to each owner of real property currently located within the GRAD
boundaries.
FISCAL IMPACT:
There will be no impact on the County General Fund. Processing costs have been paid by the applicant. The
applicant will also contribute to the California Tradewinds GHAD an amount equal to 40 percent of the total
cumulative reserve amount in the California Tradewinds GHAD at the time the annexation resolution is adopted by
the California Tradewinds GHAD Board of Directors ("GHAD Board"). In addition, the costs for any GHAD
activities that occur within the boundaries of the land proposed to be annexed into the California Tradewinds GHAD
will be covered with revenue generated through parcel assessments for the Sea Breeze II subdivision. The proposed
assessment of$410.00 for each of the 17 improved lots in the subdivision will be considered at a subsequent
assessment ballot proceeding.
BACKGROUND AND REASONS FOR RECOMMENDATIONS:
Due to the potential for land sliding,the Conditions of Approval for the Sea Breeze II project(Subdivision 8830);
require that the Sea Breeze II subdivision be included within a GHAD prior to the issuance of the first building
permit for the project. To satisfy this requirement, the developer of the Sea Breeze II subdivision has elected to
petition the GHAD Board to annex the Sea Breeze II subdivision into the existing California Tradewinds GHAD.
The territory to be annexed pursuant to the Petition for Annexation is currently owned by the developer. The
boundaries of the territory to be annexed and the boundaries of the Sea Breeze II subdivision are the same,but are
not contiguous with the boundaries of the 46-unit California Tradewinds Subdivision 7838 that is already part of the
California Tradewinds GHAD.
SUBJECT: ADOPT Resolution No. 2008/*** fixing a hearing for September 16, 2008 at 9:30 a.m., to
consider the Petition for Annexation and the proposed First Amendment to California
Tradewinds GHAD Plan of Control, Bay Point area.(Tradewinds GHAD Funds) (District V)
Project No.: 7821-6X5046
DA'L'E: August 19, 2008
PAGE: 3 of 3
BACKGROUND AND REASONS FOR RECOMMENDATIONS (continued):
In connection with the proposed annexation,a proposed First Amendment to California Tradewinds GHAD Plan of
Control has been prepared. The proposed First Amendment to California Tradewinds GHAD Plan of Control
describes the work contemplated for the Sea Breeze II subdivision,including maintenance and monitoring activities,
including slopes, retaining walls, subdrains, subdrain outlets, bioswales and associated benches. If adopted, the
First Amendment to California Tradewinds GHAD Plan of Control would address geologic hazards within the Sea
Breeze Il subdivision. The First Amendment to California Tradewinds GHAD Plan of Control will not address
geologic hazards within the California Tradewinds subdivision 7838.
Funding for the GHAD activity on the territory proposed to be annexed to prevent, mitigate, abate and control
landslides.will be based on an assessment from each residential lot in the Sea Breeze I1 subdivision, and such
funding will be collected and used in connection with the First Amendment to the California Tradewinds GHAD
Plan of.Control (i.e., the Plan of Control for the Sea Breeze II subdivision). The proposed assessment of$410 for
each of the 17 detached single residential units in the subdivision is supported by a detailed Engineer's Report
prepared by a registered professional engineer certified by the State of California, and will be considered at a
subsequent date in accordance with Proposition 218. County staff recommends that approval of the proposed
annexation be conditioned upon subsequent approval of the proposed,assessment following an assessment ballot
proceeding and conditioned upon approval of the annexation by the County Board of Supervisors since approval of
the legislative body that formed the GHAD is required under Public Resources Code section 26581.
CONSEQUENCES OF NEGATIVE ACTION:
The Conditions of Approval for the Sea Breeze II project (Subdivision 8830) require that the Sea Breeze II
subdivision be included within a GHAD prior to the issuance of the first building permit for the project. If the
annexation of the Sea Breeze II subdivision into the California Tradewinds GHAD is not approved, the applicant
would either need to initiate proceedings to form an independent GHAD or to request approval for annexation into
another existing GHAD. If the CHAD Board does not proceed with this matter, satisfaction of this condition will
likely be delayed and possibly may not occur,
NOTICE OF PUBLIC HEARING REGARDING PETITION BY DENOVA HOMES, INC.
FOR
ANNEXATION OF TERRITORY TO THE CALIFORNIA TRADEWINDS GEOLOGIC
HAZARD ABATEMENT DISTRICT AND FOR APPROVAL OF THE PROPOSED FIRST
AMENDMENT TO CALIFORNIA TRADEWINDS GHAD PLAN OF CONTROL
YOU ARE HEREBY NOTIFIED THAT on September 16, 2008 at 9:30 a.m. in the Board of
Supervisors' Chambers located at 651 Pine Street, Martinez, California, the Contra Costa County
Board of Supervisors,, acting as the Board of Directors for the California Tradewinds Geologic
Hazard Abatement District ("CHAD"), will hold a public hearing on the Petition for Annexation
of Territory to the California Tradewinds GHAD by DeNova Homes, Inc. pursuant to Division
17 (commencing with Section 26500) of the California Public Resources Code.
The purpose of the hearing will be for the GHAD Board to receive and consider all objections to
the proposed annexation and proposed First Amendment to California Tradewinds GHAD Plan
of Control which will become the First Amendment to the existing California Tradewinds
GHAD Plan of Control if the annexation is approved, and to make a determination on whether to
approve the annexation and the proposed First Amendment to California Tradewinds GHAD
Plan of Control. The proposed annexation will not change or otherwise affect the assessment for
the properties within the existing boundaries of the California Tradewinds GHAD.
Copies of the Petition for Annexation, and the Board Order and Resolution related to the setting
of the hearing are enclosed for your review. Copies of the proposed First Amendment to
California Tradewinds GHAD Plan of Control are available for review and copying, at a cost not
to exceed the cost of duplication, at the following locations: Contra Costa County, Clerk of the
Board, Room 106, 651 Pine Street, Martinez, California; ENGEO Incorporated, 2010 Crow
Canyon Place, Suite 250, San Ramon, California; and Contra Costa County Public Works
Department, 255 Glacier'brive, Martinez, California.
Objections to the proposed annexation or to the proposed First Amendment to California
Tradewinds GHAD Plan of Control may be made by any owner of real property proposed to be
annexed into the California Tradewinds GHAD, or by any owner of real property within the
existing California Tradewinds GHAD boundaries. In order to be considered, objections must be
in writing, containing a description of the owner's land by lot, tract and map number; contain the
signature of the owner; and be mailed or otherwise delivered to the address set forth below prior
to the time set for the hearing. Objections not received by the close of business on September 8,
2008, should be presented at the hearing. If the person whose signature appears on the written
objection is not shown on the assessment roll last equalized by the county as the owner of the
subject real property, the written objection must be accompanied by evidence sufficient to
indicate that such person is the owner of such property.
Contact for information or written objections: Hillary Heard, Contra Costa County Public Works
Department, Special Districts, 255 Glacier Drive, Martinez, California. (925) 313-2022 .
7529.100.101
July 15, 2008
THE BOARD OF SUPERVISORS OF
CONTRA COSTA COUNTY, CALIFORNIA
AS THE GOVERNING BOARD OF DIRECTORS FOR THE
TRADEWINDS GEOLOGIC HAZARD ABATEMENT DISTRICT
Adopted this Resolution on August 19, 2008 by the following vote:
AYES:' . SUPERVISORS UILKENIA.
BON]LL a;GLUX'EILAND.PIEP116
NOES:: NONE
AI3SElVT `'SUPERVISOR G101A
RESOLUTION NO. 2008/SJP.
SUBJECT: ADOPT Resolution No. 2008fixing a hearing for September 16, 2008, at
9:30 a.m., to consider the Petition for Annexation of Territory to the California
Tradewinds Geologic Hazard Abatement District ("GHAD") and the proposed
First Amendment to California Tradewinds GHAD.Plan of Control, Bay Point
area. (Tradewinds GHAD Funds) (District V) Project No.: 7821-6X5046.
RECITALS:
A. On June 10, 1997, the Contra Costa County Board of Supervisors adopted Resolution No.
97/297, approving and ordering the formation of the California Tradewinds Subdivision
7838 Geologic Hazard Abatement District ("California Tradewinds GHAD") under
authority of the California Public Resources Code (Division 17, commencing with
Section 26500), and appointing itself to act as the Board of Directors for the California
Tradewinds GHAD pursuant to section 26567 of the Public Resources Code. Included
within the District were 46 single-family residences and adjacent open spaces within the
California Tradewinds Subdivision 7838.
B. On August 19, 2008, the GHAD Board was presented with and reviewed the Petition for
Annexation of Territory to the California Tradewinds Geologic Hazard Abatement
District("GHAD Petition"), which is attached hereto as Attachment 1. The territory
proposed to be annexed into the GHAD is described in the legal description set forth in
Exhibit A to Attachment 1 and identified in the boundary map as shown in Exhibit B of
Attachment 1
RE,S'OL UTION NO. 200810
SUBJECT: ADOPT Resolution No. 2068/Jf�fixin a hearing for September 16, 2008, at
9:30 a.m., to consider the Petition for Annexation of Territory to the California Tradewinds
Geologic Hazard Abatement District ("GHAD") and the proposed First Amendment to
California Tradewinds GHAD Plan of Control, Bay Point area. (Tradewinds GHAD Funds)
(District V) Project No.: 7821-6X5046.
DATE: August 19, 2008
PAGE: 2 of 2
C. On August 19, 2008, the GHAD Board was presented with and reviewed the proposed
First Amendment to California Tradewinds GHAD Plan of Control (dated December 7,
.2007 and revised July 21, 2008), which is contained in Exhibit C of Attachment 1 and is
on file at the office of the Clerk of the Board and the Public Works Department. The
proposed First Amendment to California Tradewinds GHAD Plan of Control describes
potential geologic hazards within the territory to be annexed and addresses the
prevention, mitigation, abatement and control of such hazards.
RESOL UTIONNO. 20081
SUBJECT: ADOPT Resolution No. 2008/—Mixing a hearing for September 16, 2008, at
9:30 a.m., to consider the Petition for Annexation of Territory to the California Tradewinds
Geologic Hazard Abatement District ("GHAD") and the proposed First Amendment to
California Tradewinds GHAD Plan of Control, Bay Point area. (Tradewinds GHAD Funds)
(District V) Project No.: 7821-6X5046
DATE: August 19, 2008
PAGE: 3 of 3
THE BOARD OF SUPERVISORS OF CONTRA COSTA COUNTY ACTING AS THE
BOARD OF DIRECTORS FOR THE CALIFORNIA TRADEWINDS GEOLOGIC
HAZARD ABATEMENT DISTRICT DECLARES, RESOLVES, FINDS AND ORDERS
THAT:
1. This.Resolution is made pursuant to the provisions of Division 17 of the Public Resources
Code with particular reference to Chapter 1 (commencing with section 26500), Article 3
(commencing with section 26550) and Article 4 (commencing with section 26561).
2. The Petition for Annexation of Territory to the California Tradewinds GHAD is substantially
in the form described in section 26552 of the Public Resources.Code; and the proposed First
Amendment to California Tradewinds GHAD Plan of Control is substantially in the form
described in section 26509 of the Public Resources Code.
3. The proposed annexation of the Sea Breeze II subdivision to the California Tradewinds
GHAD is exempt from the provisions of the California Environmental Quality Act (Pub. Res.
Code 21000 et seq.) in accordance with Public Resources Code Sections 21080(b)(4) and
26559.
4. The:GHAD Board has been presented with and reviewed the proposed First Amendment to
California Tradewinds GHAD.Plan of Control and has determined that the health, safety and
welfare of the public require annexation of the proposed territory to the California
Tradewinds GHAD.
5. A public hearing on the field petition, above detennination, and proposed annexation will be
held on September 16, 2008, at 9:30 a.m. in the Chambers of the GHAD Board, 651 Pine
Street, Martinez.
6. The Public Works Director, or her designee, shall mail, by first class mail, a written.notice of
the hearing on the Petition for Annexation, along with a copy of the Petition and this
Resolution, to each owner of real property proposed to be annexed to the California
Tradewinds GHAD and to each owner of property .currently located within the GHAD
boundaries pursuant to Public Resources Code sections 26561, 26562 and 26563 to consider
the proposed annexation and the proposed First Amendment to California Tradewinds
GHAD Plan of Control.
7. This Resolution shall become effective immediately upon its passage and adoption.
RES OL UTION NO. 2008
ATTACHMENT 1 .
Petition for Annexation
PETITION FOR ANNEXATION OF TERRITORY TO THE
CALIFORNIA TRADEWINDS GEOLOGIC HAZARD
ABATEMENT DISTRICT PURSUANT TO
DIVISION 17(commencing with section 26500)
OF THE PUBLIC RESOURCES CODE
OF THE STATE OF CALIFORNIA
TO: The Clerk of the California Tradewinds Geologic Hazard Abatement District("GHAD")(Clerk of the Board of
Supervisors)
The undersigned owner of land within the boundaries of the territory proposed to be annexed to the California
Tradewinds GHAD hereby requests that the Board of Directors of the GHAD ("GHAD Board") initiate proceedings to annex
the territory described in Exhibit A ("Legal Description") and shown on Exhibit B ("Boundary Map"), attached hereto, to the
California Tradewinds GHAD pursuant to Article 3 (commencing with Public Resources Code § 26550) and Article 4
(commencing with Public Resources Code § 26561) of Chapter 2 of Division 17 of the Public Resources Code (§ 26500
et seq.). Said owner is the owner of all the territory proposed to be annexed.
(a) This petition is made pursuant to Division 17 of the Public Resources Code with particular reference
to Article 3 (commencing with Section 26550)and Article 4(commencing with Section 26561),
(b) Opposite the signature of each petitioner is an indication of the lot, tract and map number or other
legal description sufficient to identify the signature of the petitioner as that of an owner of land within the territory proposed to
be annexed to the California Tradewinds GHAD.
(c) Opposite the signature of each petitioner is an indication of the date on which said petitioner's
signature was affixed to this petition.
(d) The following documents are attached to this petition and are incorporated herein by this reference as
if set forth in full in the petition:
I. A legal description of the boundaries of the territory proposed to be annexed to the California
Tradewinds GHAD (F,xhibit A);
2. A map of the boundaries of the territory proposed to be annexed to the California Tradewinds
GHAD(Exhibit B);and
3. A proposed First Amendment to California Tradewinds GHAD Plan of Control, dated
December 7, 2007 and revised July 21, 2008, prepared by an engineering geologist certified pursuant to Section 7822 of the
California Business and Professions Code, which describes in detail geologic hazards, their location and the areas affected
thereby,and a plan for their prevention,mitigation,abatement and control (Exhibit C).
Foxwood Community, LLC,a California limited liability company
By: Civic Property Group, Inc.,a Calif to oration
Its: Membe
a� APN C� � �^ -z � 0 � �30
ate By: David B. Sanson Description of Property
Its: Presi
APN 0 9 0 �� d
D to By/. David B. Sanson Description of Property
Its: Secretary
Attachments: A—Legal Description
B—Boundary Map
C—First Amendment to California Tradewinds GHAD Plan of Control
*Documents signed by corporations require?signatures. One should be the chairman of the board,president or vice president,and one should be the secretary,
assistant secretary,chief financial officer or assistant controller.
v
EXHIBIT A
Legal Description
SEA BREEZE II (SUBDIVISION 8830)
PORTION OF THE CALIFORNIA TRADEWINDS
GEOLOGIC HAZARD ABATEMENT DISTRICT
EXHIBIT "A"
ALL 'THAT REAL PROPERTY SITUATI=? IN TFIE UNINCORPORATED
AREA OF CONTRA COSTA COUNTY, STATE; OF CALIFORNIA,
DESCRIBED AS FOLLOWS:
PORTIONS OF THE, SOUT'.I-IEAST '/A OF SECTION 9 AND THE
NORTHEAST '/ OF SECTION 16, 'TOWNSI-IIP 2 NORTH, RANGE 1. WEST,
MOUNT DIABLO BASI AND MERIDIAN, FURTHER DESCRIBED AS
FOLLOWS:
BEGINNING AT THE SOUTHEAST CORNER OF SAID SECTION 9,
THENCE, (1) SOUTH 88°20'08 WEST, 660.90 FEET;
TI-IENCI-1', (2) SOUTH Ol°38'50" EAST, 1.30 DEET '.IY) TH.E .B GINNING OF
A NON-TANGENTCURVE, CONCAVE TO THF., SOUTHEAST, A RADIAL,
LINT; TO WH:ICI I BEARS NORTH 0 1 038'50" WEST;
THENCE, (3) AI.,ONG Tl-IE ARC OF SAID CURVE, HAVING A RADIUS OF
74.00 FEET, A CENTRAL, ANGLE OF 74°11107, A CHORD LENGTH OF.
89.26 FEE'T, AND AN ARC LIENGTH OF 95.81 FEET;
THENCE,E, (4) SOUTH 14°10'00"WEST, 20.04 FEET;
TFIENCE, (5) SOUTH 23°21 '39" EAST, 11.41 FEET 'TO THE NORT:'II RIGI-IT
OF WAY OF RAPALLO LINIE AND 7I4E BEGINNING OF A NON-TANGENT
CURVE, CONCAVE TO T1IE SOUTH, A RADIAL LINE TO WHICH BEA16
NORTH 28056'27" IEAS'T;
TI-H NCE, (6) ALONG SAID RIGHT OF WAY AND ALONG THE ARC OF
SAID CURVE, HAVING A RADIUS OF 128.00 FEET, A CENTRAL ANGLE
OF 34026'01.", A CHORD LENGTH OF 75.77 FE ET, AND AN ARC LENGTH
OF 7693 FEET;
'ITIENCE, (7) LEAVING SAID .RIGHT 01; WAY NOR .1-I 51031 '56" EAST,
17.72 FEET;
THENCE, (8) NORTH 14°10'00" EAST:', 18.23 FEL-r TO THE BEGINNING OT
A TANGENT CURVE, CONCAVE TO THE SOUTI-EAST;
THENCE, (9) ALONG THE ARC OF SA-ID CURVE, HAVING A RADIUS OF
132.00 FEET, A CENTRAL ANGLE OF 71-53'31", A CHORD LENGTH OF
36.35 FEET; AND AN ARC LENGTH OF 36.47 FEET;
THENCE, (10)NORTH 30°19'53" WEST, 17.72 FEET;
THENCE, (11) SOUTH 88°20'08" WEST, 239.03 FEET;
THENCE, (12) NORTH 0I039'52" WEST, 230.00 FEET;
THENCE, (13)NORTI-I 88020'08"EAST, 1.025.94 FEET;
THENCE (14) SOUTT-I 00°54'38" WEST, 230.23 ,FEET TO THE POINT OF
BEGINNING.
TI-Il LAND DESCRIBED HEREIN .CONTAINS 5.51 ACRES OF LAND,
MORE OR LESS.
k- Ds END-01, DESCRIPTION
CAONN�; �
LS 3272 FORERIDIAN ASSOCIATES, INC.
[X�. os/30/200s M
PAUL CANI.7MAY °
L.S. 3272
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EXPIRES 06/30/2008
of cap-::;:
EXHIBIT B
Boundary Map
S01-38-50-E 0
098- 8—
08552 0 090
1 63 520 1.30
098-520-101 9 ,
R=74.00' OI
\N '
SECTION SECTION , 3§:,
10 15 D=74'11'10"
C-89.26'
7;OC..".«.,."
74;gZW 230-23 S1410'00"W I
f4
SECTION
20.04 C',I fit
SECTION
16 S23-21 39-E.
POINT OF BEGINNING ABBREVIATIONS: (D lI 11.41,
SOUTHEAST CORNER OF R=RADIUS R=132.00'
SECTION 9 T. 2 N., R. 1 W.. 0=IDELTA {INCLUDED ANGLE) D=15*49'43"
C=CKORD C=36.35'
M.D.B. & M. L=ARC LENGTH L=36.47 (D
(R)=RADIAL BEARING N14*1000 E
18.23' R=128.00'
@ D=34'26'01'
N30`19'53"W C=7537'
17.72' Q L=76.93'
N
51*31'5656,'E N05-29'34"W (R�
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EXHIBIT B
SEA BREEZE 11(SUBDIVISION$830)
I'll 1;VA RED BY: IDPORTION OF THE CALIFORNIA TRADEWINDS GRAD
[n MERIAN
ASSOCIATES,INC. PORTIONS OF THE SOUTHEAST 1/4 OF SECTION 9 AND THE
CIVIL UNGINELRING - PLANNING - SURVEYING NORTHEAST 1/4 OF SECTION 16 TOWNSHIP 2 N01MI,
1.340'ritrAT 110LILWARD SUrrr 130 PIIONr:92S-9324906 RANGE I WEST, MOUNT DIABLO BASE AND MERIDIAN
WALINILITCREEK,CA 94597 FAX:92S-932-3519 FEBRUARY, 2007 SCALE: 1 100'
m
EXHIBIT C
First Amendment to California Tradewinds GHAD Plan of Control
FIRST AMENDMENT TO
CALIFORNIA TRADEWINDS
GEOLOGIC HAZARD
ABATEMENT DISTRICT (CHAD)
PLAN OF CONTROL
PREPARED
BY
ENGEO INCORPORATED
PROJECT NO. 7529.100.101
DECEMBER 7,2007
REVISED JULY 21,2008
COPYRIGHT(r 2008 BY ENGEO 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 WRI FTE..N CONSENT OI'ENGEO INCORPORATED.
Project No.
7529.100.101
December 7, 2007
Revised July 21, 2008
Mr. Jeremy Shoenig
DeNova Homes, Inc.
333 Civic Drive
Pleasant Hill, CA 94523
Subject: Sea Breeze It
Bay Point, California
FIRST AMENDMENT TO CALIFORNIA TRADEWINDS CHAD PLAN OF
CONTROL
Dear Mr. Shoenig:
Attached is the First Amendment to California Tradewinds Geologic Hazard Abatement District
(GHAD) Plan of Control. The proposed documents are intended to-reflect the annexation of Sea
Breeze II project (Subdivision 8830) into the California Tradewinds GHAD. This annexation
satisfies portions of the project Condition of Approval Numbers 69 through 73 related to GHAD
formation.
If you have any questions or would like any additional information, please do not hesitate to
contact us.
Sincerely,
ENGEO Incorporated
Eric Harrell, CEG Uri Eliahu, GE
eh/cjn
cc: 6—Hillary Heard, Contra Costa County, Public Works Department
EMGEO
INCORPORATED
TABLE OF CONTENTS
Page
Letter of Transmittal
IINTRODUCTION .................................................................................................................... 1
PropertyIdentification...............................................................................................................1
II SEA BREEZE II PLAN OF CONTROL..................................:......................:........................ 2
1. Authority and Background ..................................................................................................2
a. Authority...........................................................................:........................................2
b. Background ..............................................:.................................................................3
c. Existing Site Conditions.............................................................................................3
d. Proposed Developirient ..............................................................................................4
2. Regional Geology and Geologic Maps...............................................................................4
a. Site Geology...............................................................................................................5
b. Geologic Units............................................................................................................5
c.. Groundwater...............................................................................................................6
3. Seismic Sources..................................................................................................................6
4. Geologic Hazards...............:................................................................................................7
a. Slope Instability—Sea Breeze II.................................................................................7
b. Seismically Induced Ground Shaking........................................................................8
c. Expansive Soils
5. Slope Stability Considerations During Mass Grading.........................................................9
6. GHAD-Maintained Improvements and Open Space Areas..............................................10
a. General Landslide Mitigation....................................................................................11
7. Criteria for GHA.D Responsibility.....................................................................................12
a. Isolated or Remote Slope Instability........................................................................12
b. Single Property.........................................................................................................13
c. Geologic Hazards Resulting From Negligence of Property Owner.........................13
d. Property Not Accepted.............................................................................................13
e. Geologic Hazard Which Requires Expenditure in.Amount Exceeding the Value
of the Threatened or Damaged Improvement...........................................................14
f. GHAD Funding or Reimbursement for Damaged or Destroyed Structures or
SiteImprovements....................................................................................................14
g. No Reimbursement of Expenses Incurred by Property Owners ..............................15
7529.100.101
December 7, 2007
Revised July 21, 2008
ENGEO
INCORPORATED
TABLE OF CONTENTS (Continued)
. 8. Biotechnical Recommendations for Prevention and Mitigation of Existing or
Potential Erosion Hazards.................................................................................................15
9. Priority for District Funded Repairs..................................................................................16
10. Maintenance and Monitoring Schedule............................................................................16
LIST OF REFERENCES
FIGURE 1 —Site Plan
EXHIBIT A—Legal Description Sea Breeze II Subdivision
EXHIBIT B—Boundary of the Sea Breeze 1I Portion of the California Tradewinds GHAD
EXHIBIT C —Sea Breeze II, Funding and Acceptance
Funding and Acceptance of Responsibility by the District
1. Activation of Assessment
2. Initial Developer Contributions
3. Ownership of the Open Space
4. Responsibilities for GHAD Activities
5. Process for Transferring Responsibility for GHAD Activities
EXHIBIT D—California Tradewinds GRAD, Right-of-Entry `
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I INTRODUCTION
Under the Conditions of Approval for the Sea Breeze II project (Subdivision 8830), Contra Costa
County has required that the Sea Breeze 11 development be included within a GHAD prior to the
issuance of the first building pen-nit for the project. To satisfy this requirement, the developer of
the Sea Breeze II subdivision has elected to petition the Board of Directors of the California
Tradewinds GRAD to annex the Sea Breeze II subdivision into the existing California
Tradewinds GHAD ("GHAD" or"District").
Property Identification
A written description of the properties to be annexed into the existing California Tradewinds
GHAD is provided in Exhibit A and shown graphically on Exhibit B. The GHAD annexation
area includes Assessor's Parcel Number 098=210-030.
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Ill SEA BREEZE II PLAN OF CONTROL
1. Authority and Background
a. Authority
The Contra Costa County Board of Supervisors adopted Resolution No. 97/297 on June 10, 1997
approving the formation of the California Tradewinds Geologic Hazard Abatement District
("GRAD" or "District") under authority of the California Public Resources Code (Division 17,
commencing with Section 26500). Included within the District were 46 single family residences
.and adjacent open spaces within the California Tradewinds development (Subdivision 7838).
Pursuant to the Resolution, the Contra Costa County Board of Supervisors members act as the
Board of Directors of the California Tradewinds GRAD.
Section 26553 of the Public Resources Code requires a Plan of Control, prepared by a
State Certified Engineering Geologist, as a prerequisite to fon-nation of a GRAD. Section 26581
of the Public Resources Code makes this requirement applicable to annexations. An Engineering
Geologist, certified pursuant to Section 7822 of the Business and Professions Code, prepared the
original Plan of Control for the California Tradewinds GRAD. The Business and Professions
Code requires a Plan of Control to describe in detail geologic hazards, their location, the area
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, this
proposed First Amendment to the original California Tradewinds GHAD Plan of Control has
been prepared to accompany the petition to annex the Sea Breeze 1I subdivision into the
California Tradewinds GRAD.
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b. Background
A landslide occurred within the adjacent Sea Breeze development in 1996. Studies of this
landslide indicated that a tuff bed was involved with the slope failure. The potential influence of
this tuff bed on slope stability has been the focus of a number of studies on the Sea Breeze II site.
This tuff bed of interest has been identified in exploratory borings at a depth of 80 feet beneath
the Sea Breeze II site. The influence of this bed on slope stability was addressed in three PRA
reports dated June 24, September 23,. and October 13, 2005. Slope stability analysis was
perfornied on the most critical slope at the project in the area of Lot 16. A factor of safety in
excess of 1.9 was reported for this analysis. The conclusion of these reports and the peer review
letters completed by Hultgren-Tillis Engineers indicate that there is an adequate factor of safety
for the Sea Breeze II site for the sections analyzed.
Additional slope stability analysis was performed by Stevens, Ferrone and .Bailey (SFB) in their
Comprehensive Geotechnical Investigation report dated March 1.6, 2007. As part of their
analysis, they describe completing several cross-sections for slope stability analysis and to
determine if tuff beds may potentially daylight on the any of the planned cut slopes. According
to the SFB report, there is a slight potential that a tuff bed could daylight on a planned cut slope
south. of Lot No. 1. In the opinion of SFB, adverse bedding including the potential exposure of
tuffaceous material, can be mitigated by rebuilding cut slopes as engineered fill slope as needed
based on geologic observation during site grading.
c. Existiniz Site Conditions
The Sea Breeze 1I site is a rectangular-shaped 5.4-acre parcel located in Bay Point, California.
Within the parcel's boundary limit, existing elevations range from a low of about 155 feet above
mean sea level (msl) at the northeastern corner of the property, to a high of about 268 feet above
msl at.the southwestern edge of the site. As reported in the geotechnical report, a single family
residence was previously located on the subject parcel. In 1990, engineered fill, up to depth of
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about 16 feet, was placed on the subject site from the adjacent Sea Breeze development.
Currently the site is undeveloped-open space. Existing single-family residential developments
are located west, east and south of the subject property. Undeveloped open space areas are
located north of the subject property. An existing Calpine gas pipeline, within a 25-foot wide
easement, is located along the southern edge of the property.
d. Proposed Development
The mass grading plans prepared by Meridian Associates show grading for 17 single-family
residential units. In addition, Savona Way and Savona Court will be constricted to access the
residential lots. As shown on the referenced grading plan, proposed grading on the site will
result in cuts up to 23 feet and fill thickness of up to 22 feet. A retaining wall is shown along the
southern side of Savona Way, within a common area and part of the GHAD responsibilities, with
an exposed height of up to 5 feet. Drainage benches with bioswales are planned for the
engineered fill slopes in the central and eastern portions of the site. The engineered fill slopes
will be supported with subdrained keyways. A Focused Geotechnical Study Update of the
Revised Grading Plan for the Proposed Single Family Residential Development at Sea Breeze II
was. completed by Purcell, Rhodes and Associates (PRA). and dated March 13, 2006.
Stevens, Ferrone and Bailey (SFB) completed.a Geotechnical Investigation of the Sea Breeze II
Development in their report dated March 16, 2007. Final grading work at the site will have been
completed prior to acceptance of the property by the District, as further discussed in Section 2
below.
2. Regional Geology and Geologic Maps
The site is located within the Coast Ranges geologic province of California, a series of
northwest-trending ridges and valleys. Regional geologic maps were reviewed as part of the
Purcell, Rhodes and Associates Geotechnical Investigations of the Sea Breeze II site. Along
with others, regional geologic maps of the area have been prepared recently by Graymer (1994).
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The regional mapping prepared by Graymer indicates that the site is underlain Tulare formation
of Pliocene age. The Tulare formation is .described as a poorly consolidated non marine
siltstone, sandstone, conglomerate and tuff. Regional mapping shows that bedrock units are
trending in a general northwest-southeast direction and dipping to the north at between 14 to
24 degrees in the area of the site.,
The site is not located within a State of California Earthquake Fault Zone for active faults
(CDMG, 1982). The nearest mapped active fault is the Greenville fault located approximately
3.7 miles southwest of the site. Purcell Rhodes and Associates state that they did not find
evidence of active or potentially active faults on the site.
a. Site Geology
The geologic units mapped on the site include bedrock and surficial deposits consisting of
artificial fill and colluvium. The geologic units described below are adapted from reports
completed by PRA for the site in 2003, 2004 and 2005.
In general, alluvial deposits are located on the lower-lying areas in the central and northern
portions of the site. Artificial fill has been placed in some of these lower alluvial-filled swales.
Thicker deposits of colluvium are located in swale areas where it has not been disturbed by
previous grading or quarrying activities. On the higher portions of the site, the colluvium tends
to be a thinner mantle on the bedrock materials.
b. Geologic Units
Artificial Fill. Artificial.fill encountered on the site is identified as material imported from
grading for the Sea Breeze development. The engineered fill materials are mapped on the central
and eastern portions of the property. The fill materials were described as sandy clay with
sandstone fragments.
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Colluvium. Mantling the bedrock and filling swales at the on the site are colluvial deposits.
These sediments are derived from weathering of the underlying bedrock and consist mostly of a
silty clay matrix with sand and rock fragments. This material generally is moderately expansive
and has low strength. Where colluvium is located on sloping ground, it may be characteristically
unstable.
Bedrock. Bedrock at the site was identified during subsurface explorations by PRA as claystone,
siltstonc, sandstone, conglomerate and tuff. The bedrock was described from samples recovered
from the exploratory borings and observations of the exploratory test pit logs as highly
weathered and friable to moderately strong. In general, bedding was described as trending to the
northwest and dipping to the north.
c. Groundwater
At the tirne of subsurface work, free groundwater was not encountered near the surface in a
number of exploratory borings and test pits. Fluctuations in groundwater levels may occur
seasonally and over a period of years because of precipitation, changes in drainage patterns,
irrigation and other factors. Future irrigation may cause an overall rise in groundwater levels.
3. Seismic Sources
The nearest State of California-zoned, active] fault is the Greenville fault located about 3.7 miles
southwest of the site. In addition, the Concord-Green Valley fault is located approximately
4.5 miles.west of the site and the Calaveras fault is located approximately 11.9 miles south of the
Sea Breeze lI site. While the probability of ground rupture is considered low, as described in the
PRA report, there is a high probability that the site and any improvements will be subject to
An active fault is defined by the State Mining and Geology Board as one that has had surface displacement within
Holocene time(about the last 10,000 years) (Hart, 1994). The State of California has prepared maps designating zones
for special studies that contain these active earthquake faults.
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strong ground shaking during the lifetime of the project. Purcell, Rhodes and Associates state
that they did not find evidence of active or potentially active faults on the site.
4. Geoloizic Hazards
Geologic hazards identified for the Sea Breeze II site in the Purcell, Rhodes and Associates
(PRA) and Stevens, Ferrone and Bailey(SFB) reports, include:
• Slope instability.
• Seismically induced ground shaking.
• Expansive soils.
These geologic hazards are not expected to be eliminated entirely by site grading. Slope
instability or potential slope instability is not unique to this project, but is of importance for
hillside projects throughout the San Francisco Bay Area such as California Tradewinds. Future
stability depends on various factors, including any introduction of natural or artificial
groundwater, future grading and earthquake ground shaking.
a. Slope Instability— Sea Breeze II
During mapping for the Design-Level Geotechnical Investigations, no landslides were identified
within or immediately adjacent to the proposed development; however, landslides have been
mapped in the area of the site (Nilsen, 1975) and have occurred on the adjacent Sea Breeze
development site and may occur during the life of the development. While we anticipate that
most of the landsliding that may occur would involve the movement of shallow materials, the
possibility of deeper future landsliding exists.
Since earth stability is the District's prime geotechnical concern, this section describes several
types of slope instability that the District will have the authority to monitor, abate, mitigate or
control as discussed further in Section 4 below.
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A landslide is defined as a mass of rock, soil and other debris that has been displaced downslope
by sliding, flowing or falling. Landslides include cohesive block glides and disrupted slumps
that have formed by displacement along a planar slip surface or rotation (displacement along a
curved slip surface). Undercutting and erosion of hillside slopes trigger many slope failures.
Slope failures are also often triggered by increased pore water pressure due to the infiltration of
rainwater. The resulting decrease of shear resistance (internal resistance to deformation by
shearing) can cause the slope to move. The level of the groundwater table varies with the
amount of rainfall for the area. If rainfall is higher than average.during the winter season, the
water table may be higher than average on a hillslope and groundwater pressures may become
dangerously high. Under these conditions, hillside movement can be activated.
Areas of thickened soil cover on the hillslopes are known as colluvium (Qc). Colluvial deposits
are typically the result of soil creep and may be in a weak, unconsolidated state, making them
susceptible to landsliding if undercut. Colluvium is up to ten to fifteen feet in thickness.
Landslides and colluvial deposits located within open space areas are natural landfonns that do
not require initigation except where they affect roan-made improvements. Potential mitigation
and repair measures for District areas near improvements are discussed in Section 3b.
b. Seismically Induced Ground Shaking
As identified in the geotechnical report, an earthquake of moderate to high magnitude generated
within the San Francisco Bay Region could cause considerable ground shaking at the site, similar to
that which leas occurred in the past. It appears that seismic slope stability has been considered in
the Purcell Rhodes and Associates reports; however, seismically generated slope failures could
occur in open-space areas outside the development limits.
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c. Expansive Soils
Near-surface colluvium and alluvium at the site could exhibit high potential for expansion.
These potentially expansive soils could impact the planned site 'development. Expansive soils
shrink and swell as a result of moisture changes. This can cause heaving and cracking of
slabs-on-grade, pavements and structures founded on shallow foundations. The potential for
expansive soils has been identified in previous reports for the property. Shrink and swell of
expansive soils on slopes is a portion of the mechanism of creep movement which can result in'
shallow slope instability.
5. Slope Stability Considerations During Mass Grading
As recommended in the Geotechnical Exploration reports completed by Purcell Rhodes and
Associates (PRA) for the Sea Breeze II development, existing artificial fills within the graded
area will be removed only as required to construct additional keyways for the planned engineered
fill placement. Stevens, Ferrone and Bailey (SFB) recommended that they review construction
documentation for the existing fill before allowing it to remain in place. In graded areas, the
unsuitable materials including colluvium will be overexcavated to firm undisturbed materials
below the unsuitable material as determined by the project Geotechnical Engineer or Engineering
Geologist (SFB) at the time of grading. Subdrains will be installed to collect the subsurface
waters. The configuration of each subdrainage system will be tailored to the individual area at
the time of grading. The Geotechnical Engineer and/or the Engineering Geologist will determine
the location and depths of subdrains at that time. The location and elevation of subdrains and
outlets will be surveyed during construction. Each subexcavation will then be reconstructed to
final grade by keying and benching below the landslide plane with compacted, drained
engineered fill.
The cuts will be viewed by the SFB Geologist during grading to provide mitigation schemes for
unsuspected slope conditions which could decrease the slope stability. Such conditions include
unfavorable bedrock attitudes and seepage conditions. Based on measurements taken during
subsurface exploration, SFB anticipates the orientation.of bedding may be locally adverse to
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proposed cut slopes, retaining wall cuts and utility trenches. It is our understanding that SFB
will be evaluating these conditions during the grading operations at Sea Breeze II and that, as
needed, cut slopes will be overcut and buttressed with drained engineered fills based on the
recommendations of SFB personnel. As recommended in the peer review letters, SFB will
provide an as-built plan of the geology, buttressed slopes and associated subdrain systems
following completion of the project grading. This plan must be made available to the GHAD for
its use.
6. GHAD-Maintained Improvements and Open Space Areas
The District will have authority to manage erosion and geologic hazards within.the open space
areas within the boundary shown in Exhibit B. The governing documents 'of the Sea Breeze 1I
HOA are to include provisions requiring an easement be granted to the California Tradewinds
GHAD for access, inspection, maintenance and repair of GHAD improvements in a form
acceptable to the California Tradewinds GHAD Board of Directors. Covenants, Conditions and
Restrictions (CC&Rs) and disclosure documents for the Sea Breeze 11 Homeowners' Association
(HOA) should include provisions such as allowing access toprivate property to allow for
monitoring and mitigation activities of the GHAD in a form substantially similar to Exhibit D.
At the discretion of the GHAD general manager,.the GHAD may monitor and provide general
maintenance for the following site improvements located within the Sea Breeze II Homeowner
Association owned parcels.
• Slopes
• Retaining walls
• Subdrains'and subdrain outlets
• Bioswales and associated benches
As provided in Condition of Approval No. 70, the maintenance of streets, street lights,
landscaping, storm drains and stormwater quality infi-astructure shall remain the responsibility of
the HOA or its designee other than Contra Costa County.
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At the discretion of the GHAD general manager, the GHAD may undertake steps to prevent,
mitigate, abate, and control landslide and erosion hazards and control vegetation within the
subdivision open space and hillsides, as provided in Section 3.
At the discretion of the GHAD general manager, the GHAD may undertake general maintenance
of the surface drainage improvements in the open space and on the hillsides, such as the
bioswales, as well as storm drain inlets and outlets in open space. The GHAD general manager
may also authorize activities designed to prevent, mitigate, abate: or control potential geologic
hazards such as landslides and slope erosion within the open space, including the unimproved
hillsides. Clearing of fire breaks and maintenance of the open space (other than hazard
abatement) will be the responsibility of the HOA.
Factors that the GHAD general manager may consider in not approving such repairs or
maintenance activities include but are not limited to, funding limitations, project priorities and
weather related risks.
a. General Landslide Mitigation
The techniques the District may employ to prevent, mitigate or abate landsliding or adverse
erosion damage might include, but are not necessarily limited to:
• Removal of the unstable earth mass.
• Stabilization (either partial or total) of the landslide by removal and replacement with
compacted drained fill.
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• Construction of structures to retain or divert landslide material or sediment.
• Constriction of erosion control devices such as gabions, rip rap, geotextiles or lined ditches.
• Placement of drained engineered buttress fill.
• Placement of subsurface drainage devices (e.g. underdrains, or horizontal drilled drains).
• Slope correction (e.g. gradient change, biotechnical stabilization, and slope trimming or
contouring).
• Construction of additional surface ditches and/or detention basins, silt fences, sediment traps,
or backfill. or erosion channels.
• Removal of debris and repair of cracks in lined surface drainage ditches and drainage
terraces.
Potential landslide and erosion hazards can often best be mitigated by controlling soil saturation
and water runoff and by maintaining the surface and subsurface drainage system including lined
surface drainage ditches and drainage terraces.
7. Criteria for GHAD Responsibility
To establish an appropriate GHAD assessment level for the Sea Breeze II portion of the
California Tradewinds CHAD, it is important to define clearly the limits of the GHAD's
potential responsibilities. At the discretion of the GRAD general manager, the GHAD may
accept responsibility for the repair of properly permitted and maintained improvements or
strictures on individual lots listed in Exhibit C that are damaged by landsliding and erosion;
however, the intent of this First Amendment to the California Tradewinds GHAD Plan of.
Control is not to extend the GHAD's responsibilities to every potential situation of slope
instability; as such, the following are exclusions from any potential GHAD responsibility.
a. Isolated or Remote Slope Instability
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The GHAD shall not have responsibility to monitor, abate, mitigate or control slope instability
that does not involve damage to, or pose a significant threat to damage, site improvements or
flood control capacity. As.used herein, the terns "site improvements" means buildings, roads,
sidewalks, utilities, improved trails, swimming pools, geologic stabilization features, or similar
improvements.
b. Single Property
The GHAD will not prevent, mitigate, abate or control geologic hazards or damage which are
limited in area to a single parcel of property unless the geologic hazard has damaged, or poses a
:significant threat of damage to site improvements located on other property within the GHAD
`boundaries.
c. Geologic Hazards Resulting From Negligence of Property Owner
The GHAD may, in the general manager's sole discretion, decline to prevent, mitigate, abate or
control geologic hazards or damage which occurred or resulted from any negligence of the
homeowner and/or the homeowner's contractors, agents or. employees in developing,
°investigating, grading, constructing, maintaining or perforniing or not performing any
post-development work on the subject property so long as the geologic hazard is limited to a
single lot, pursuant to exclusion b.
d. Property Not Accepted
The GHAD shall not have responsibility to prevent, mitigate, abate or control geologic hazards
or repair damage, which is situated on a parcel of real property, which the .GHAD has not
accepted in accordance with Exhibit C. The GHAD, however, may monitor, abate, mitigate or
control slope instability on a parcel of real property which the GHAD has not accepted in
accordance with Exhibit C, to the extent, in the GHAD general manager's discretion such actions
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are necessary to address damage or a significant threat to damage to site improvements on a
GHAD accepted parcel.
e. Geologic Hazard Which Requires Expenditure in Amount Exceeding the Value of the
Threatened or Damaged Improvement
The GHAD may elect not to prevent, mitigate, abate or control a geologic hazard where, in the
general manager's sole discretion, the anticipated expenditure required -to be funded by the
GHAD to prevent, mitigate, abate or control the geologic hazard will exceed the value of the
structure(s) and site improvement(s) threatened with damage or loss.
f GHAD Funding or Reimbursement for Damaged or Destroyed Structures or Site
Improvements
In the event a residence or any other private structure, site improvement or landscape feature is
damaged or destroyed as a result of a geologic hazard, the District may fund or reimburse the
property owner for the expenses necessary to repair or replace the damaged or destroyed
structure, site improvement or landscaping. Unless otherwise authorized by the Board of
Directors, the total dollar amount of the District funding or reimbursement paid to all property
owners whose property is damaged by the geologic hazard may not exceed ten percent (10%) of
the total costs incurred by the District in actually mitigating, abating or controlling the geologic
hazard that causes the damagez. In the event the geologic hazard damaged or destroyed a
structure, site improvement or landscaping which violated any provisions of the City Building
Code or City Code at the time of its installation or improvement, the District may decline to
provide any funding, or reimbursement to the property owner for repair or replacement of the
damaged structure, improvement or landscaping.
'`For example,if a landslide causes$10,000 in structural damage to each one of four neighboring homes for a total of
$40,000 in structural damage and it costs the District$100,000 to design and install a new retaining wall to abate the
slide,the District may only reimburse each property owner$2,500 of their$10,000 in structural damage.
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g. No Reimbursement of Expenses Incurred by Property Owners
The GHAD will not be obligated to reimburse a property owner for expenses incurred for the
prevention, mitigation, abatement, or control of a geologic hazard absent a written agreement
between the property owner and the GHAD to that effect, which agreement has been executed
prior to the property owner incurring said expenses, and following an investigation conducted by
the GHAD.
8. Biotechnical Recommendations for Prevention and Mitigation of Existing or Potential
Erosion 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 strictures (e.g. brush layering
and willow waddling).
In other areas, biotechnical slope protection may involve the use of mechanical elements or
structures in combination with biological elements to provide erosion control and help prevent
small-scale slope failures. Locally, walls, welded-wire walls, gabion walls, rock walls, riprap
and reinforced earth walls used in combination with carefully selected and planted vegetation
can provide high quality slope protection. The vegetation may be planted on the slope above a
low retaining structure or toe wall, or the interstices of the structure can be planted.
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9. Priority for District Funded Repairs
Emergency response and scheduled repair expenditures are to be prioritized by the
General Manager, utilizing its discretion, based upon available funds, a prudent reserve and the
approved operating budget.
Should available fiends not be sufficient to undertake all of the identified remedial and preventive
stabilization measures, the expenditures shall be prioritized as follows in descending order of
priority:
A. The prevention, mitigation, abatement or control of geologic hazards that have either
damaged or pose a significant threat of damage to residences, critical underground utilities
or paved streets.
B. The prevention, mitigation, abatement or control of geologic hazards that have either
damaged or pose a significant threat of damage to private recreation facilities (e.g. pools,
spas, etc.).
C. The prevention, mitigation, abatement or control of geologic hazards that have either
damaged or pose a significant threat of damage limited to loss of landscaping or other
similar non-essential amenities.
D. The prevention, mitigation, abatement or control of geologic hazards existing entirely on
open-space property and which have neither damaged nor pose a significant threat of
damage to any site improvements.
10. Maintenance and Monitoring Schedule
It is recommended that geologic features and District-maintained facilities be inspected on a
regular basis. Budget pennitting, inspections should generally be scheduled to occur two times .
per year in normal years and three 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;
raid-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
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rainfall intensity and/or recurrence. It is anticipated that the monitoring events for the Sea
Breeze II portion of the California Tradewinds GHAD would be completed on the similar
schedule.
• A District Engineer and/or Geologist should inspect the lined surface.of bioswales within the
District boundaries on a.regular schedule. If possible, inspections should be scheduled twice
each year, budget permitting. One inspection should be in the fall prior to the onset of winter
rains. The inspector should check for sedimentation in or movement of the bioswales.
Repairs and maintenance should be performed on a regular schedule. Excess silt or sediment
in the swales should be removed before the beginning of the next rainy season.
• Subsurface.drain outlets and horizontal drilled drain outlets, if any, 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.
The District should review and adjust its inspection schedule annually and assess the
effectiveness of its preventive maintenance program on a regular basis. District staff should
prepare an annual report to the Board of Directors with recommendations for maintenance and/or
repair projects. Consultants, if necessary, may be retained to undertake the needed studies. The
District Engineer and/or Engineering Geologist retained by the District shall prepare an annual
inspection report for presentation to the District Board of Directors.
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REFERENCES
Bellecci and Associates, hic., Preliminary and Final Development Plan, Preliminary Grading Plan,
Vesting Tentative Map, Sea Breeze II, Subdivision 8830, Contra Costa County, California,
dated June 8, 2004, latest revision December 20,2005.
Contra Costa County Community Development Department, Conditions of Approval for Vesting
Tentative Map, SD048830 and Final Development Plan, DP043031 as Approved at the
July 101 2006 East County Planning Commission Meeting.
Graymer, R.W., Jones D.L., and Brabb E.E., Preliminary Geologic Map Emphasizing Bedrock
Formation in Contra Costa County, California, 1994.
.Meridian Associates, Inc., Improvement Plans for Sea Breeze 11, Subdivision 8830, Contra Costa
County, California; 13 Sheets, dated March 2007.
Nielsen, T.H., Preliminary Photointerpretation Map of Landslide and Other Surficial Deposits of
Part of the Honker Bay 7-1/2' Quadrangle, Contra Costa County, California:. United States
Geological Survey, Open File Map 75-277-20.
Hultgren-Tillis Engineers, Geotechnical/Geologic Peer Review, Sea Breeze II Subdivision,
Project No. 189.12, dated November 19, 2005.
Hultgren-Tillis Engineers, Initial Peer Review, Sea Breeze 11 Subdivision, Project No. 18.9.12, dated
November 18, 2004.
-Purcell, Rhoades and Associates, Inc., Geotechnical Issues Regarding the Calpine Gas Line,
Proposed Single Family Residential Development, Subdivision 8830, Savona Way — Off
Rapallo Way, Bay Point, Contra Costa County, California, No. 04-211/7092-03, dated
March 22,2006.
Purcell, Rhoades and Associates, Inc.,Focused Geotechnical Study Update—Revised Grading Plan,
Proposed Single Family Residential Development, Savona Way — Off Rapallo Way,
Subdivision 8830, Bay Point, California, Contra Costa County, California,
No. 04-211/7092-03, dated February 17, 2006 and revised March 13,2006.
Purcell, Rhoades and Associates, Inc., Supplemental Slope Stability Analysis, Proposed Single
Family Residential Development, Subdivision 7556, Bay Point, California, Contra Costa
County, California,No. 04-211/7092-03,dated October 13, 2005.
7529.100.101
December 7, 2007
Revised July 2.1, 2008
EIVGEO
INCORPORATED
REFERENCES (Continued)
Purcell, Rhoades and Associates, Inc., Response to Discussion of Slope Stability Review, Proposed
Single Family Residential Development, Subdivision 7556, Bay Point, California, Contra
Costa County, California,No. 04-211/7092-03,dated September 23, 2005.
Purcell, Rhoades and Associates, Inc., Focused Geotechnical Study Update — Slope Stability
Review, Proposed Single Family Residential Development, Savona Way—Off,Rapallo Way,
Subdivision 7556, Bay Point, California,No. 04-211/7092-03, dated June 24,2005.
Purcell, Rhoades and Associates, Inc., Geotechnical Study Update, Proposed Single Family
Residential Development, Savona Way — Off Rapallo Way, Subdivision 7556, Bay Point,
Cali forma,No. 04-211/7092-0 1, dated November 24, 2003.
..Purcell, Rhoades and Associates, Inc., Geotechnical Study, Proposed Residential Development,
Middleton Property, Subdivision 7556, West Pittsburg, Califoriia, No. 04-149/6375-01, dated
April 20, 1992.
Stevens, Ferrone and Bailey Engineering Company, Inc., Comprehensive Geotechnical
Investigation, Sea Breeze II Residential Development, Bay Point, California, SFB
Project No. 155-40, dated March 16, 2007.
Terrasearch Inc., California Tradewinds, Geologic Hazard Abatement District Plan of Control,
Subdivision 7838, Evora Road, Bay Point, Contra Costa County, California,
Project No. 6319.poc; dated January 30, 1997.
7529.100.101
December 7, 2007
Revised July 21, 2008
EIVGEO
INCORPORATED
FIGURE 1
Site Plan
7529.100.101
December 7, 2007
Revised July 21, 2008
z
S
3
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a
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EIVGEO
INCORPORATED
'EXHIBIT A
LEGAL DESCRIPTION FOR SEA BREEZE II(SUBDIVISION 8830)
PORTION OF THE CALIFORNIA TRADEWINDS GHAD
7529.100.101
December 7, 2007
Revised July 21, 2008
SEA BREEZE II (SUBDIVISION 8830)
PORTION OF THE CALIFORNIA TRADEWINDS
GEOLOGIC HAZARD ABATEMENT DISTRICT
EXIIJBIT "A"
ALL' THAT REAL PROPERTY SITUATE IN THE UNINCORPORATED
AREA OF CONTRA COSTA COUNTY, STATE. 'OF CALIFORNIA,
DESCRIBED AS FOLLOWS:
PORTIONS OF THE SOUTIIEAST '/ OF SECTION 9 AND THE
NORTHEAST '/ OF SECTION 16, TOWNSHIP 2 NORTH, RANGE 1. WEST,
MOUNT DIABLO BASE AND MERIDIAN, FURTHER DESCRIBED AS
FOLLOWS:
BEGINNING AT THE SOUTHEAST CORNER OF SAID SECTION 9,
THENCE, (1) SOUTH 88020'08" WEST, 660.90 FEET;
THENCE, (2) SOUTH 01°38'50" EAST, 1.30 FEET TO THE BEGINNING OF
A NON-TANGENT CURVE, CONCAVE TO THE SOUTHEAST, A RADIAL
LINE TT)WHICH BEARS NORTH 01038'50" WEST;
THENCE, (3) ALONG T'ITE; ARC. OF SAID CURVE, 1-DIVING A RADIUS OF
74.00 FEET, A. CENTRAL, ANGI.,E OF 7401110"'
4°1I 'I0", HRD
A COLENGTH OF
89.26 FEET, AND AN ARC LENGTH OF 95.81 FEET;
THENCE, (4) SOUTH 14°10'00" WEST, 20.04 FEET;
THENCE, (5) SOUTH 23°21 '39" EAST, 11.41 FEET TO TI-IT- NORTH RIGHT
OF WAY OF RAPALLO I.,INE AND THE BEGINNING OF A NON-TANGENT
CURVE, CONCAVE To TFIE SOUTH, A RADIAL LINE rFO WI-fICI-I BEARS
NORTH 28°56'27"EAS-r;
THENCE, (6) ALONG SAID RIGHT 017, WAY AND ALONG THE ARC OF
SAID CURVE, HAVING A RADIUS OF 128.00 FEET, A CENTRAL ANGLE
OF 34"26'01", A CHORD LENGTH OF 75.77 FEET, AND AN ARC LENGT'I I
OF 76.93 FEE;.
THENCE, (7) LEAVING SAID RIGHT OF WAY NORTH 51°31 '56" EAST,
17.72 FEET;
THENCE, (8) NORTH 14°10'00" EAST, 18.23 FEET TO THE BEGINNING OF
A TANGENT CURVE, CONCAVE TO THE SOUTHEAST;
THENCE, (9) ALONG THE ARC OF SAID CURVE, HAVING A RADIUS OF
132.00 FEET, A CENTRAL ANGLE OF 71-53'31", A CHORD LENGTH OF
36.35 FEET; AND AN ARC LENGTII OF 36.47 FEET;
THENCE, (10) NORTH 30°19'53" WEST, 17.72 FEET;
THENCE, (1 I) SOUTH 88°20'08" WEST, 239.03 FEET;
THENCE, (12) NORTH 01°39'52" WEST, 230.00 FEET;
TIIENCE, (13)NORTH. 88020'08" EAST, 1025.94 I,EET;
TIiENCE (14) SOUTII 00054'38" WEST, 230.23 FEET TO THE POINT OF
BEGINNING.
THE LAND DESCRIBED HEREIN CONTAINS 5.51. ACRES OF LAND,
MORE OR LESS.
o �A D s END OF DESCRIPTION
v` .v CC�
L.S 3272 FOR MERIDIAN ASSOCIATES, INC.
EXPI 06/30/200s PAUL CANUMAY
L.S. 3272
EXPIRES 06/30/2008
o
cm\F
ENGEO
INCORPORATED
EXHIBIT B
BOUNDARY OF THE SEA BREEZE II PORTION OF THE CALIFORNIA TRADEWINDS
GHAD
7529.100.101
December 7, 2007
Revised July 21, 2008
098-520 F 1 098-520 SOI'38'50"E 0
085 1 063. Q 1.30'
(� \ - 098-520-101 3
R=7h.D0' \ NOi'38'50"W (R) I
SECTION SECTION \- - - •- -- • w
� \ 10 15 O=74'11'10"
C=89.26' `v I
�_ _ - _ - l°=95.81 S14'10'00"W
14 SUO'S4'3II"W 230.23' 20.04' N j ti
SECTION SECTION
9 16 S23'21'39"E
POINT OF BEGINNING ABBREVIATIONS: . 9 11.41
SOUTHEAST CORNER OF R=RADIUS R=132.00'
SECTION 9 T. 2 N., R. 1 W., D=DELTA (INCLUDED ANGLE) D=15'49'43"
C=CHORD C=36.35'.
M.D.B. & M. L=ARC LENGTH L=36.47'
(R)=RADIAL BEARING N14'10'0. R=128.00'
10 18.23'
D=34'26'01"
N3D'19'53"W C=75.77'
17.72' � L=76,93'
N51'31'56"E N05'29'34"W (R)
Lo 17.72' -
I /7 DETAIL �A. .
�n \ SCALE: 1"=50'
00
I \
SITL�
NLo
COURT
098-210-030 � 7-• Qpg T. RAPHAEL WY WAY
o I \
I N I \ EVORA ROAO . -ST. TROPEZ DR. QPSS
p loo 5.51 tACRES 00
i0 SNI
1 ` z Iin
i 4
°' I w
O Q I o VICINITY MAP
\ NOT TO SCALE
,<\ \\ / LAND S
CA
1/ .5821\\ LS 3272\501 v /j EXP. 06/30/2008 7*
S Q'
or CAL�FO
DETAIL 'A'-t- �Q•
/
1 100 50 0 100 200
in p
o n� SCALE IN FEET
o; I d
M 00
O
3
0 1'lt
O O0000 \
12 v, o
00 NOt'39'52"W 230.00' 0
, I
0) i
098-484-004 ' o 991399
SEA BREEZE II(SUBDIVISION 8830)
1'1t1:1'Altt:t)1tv: ; �� PORTION OF THE CALIFORNIA TRADEWINDS GHAD
d V'Jt ASSOCIA'11.S,INC. PORTIONS OF THE SOUTHEAST 1/4 OF SECTION 9 ANIS THE
CIVIL 1:NGINEI-RING " PLANNING • SURVEYING NORTHEAST 1/4 OF SECW 16 TOWNSHIP 2 NOM,
1340TRI AT OOUL.EVARD surn.130 1'110 NE:925-932-4906 RANGE 1 WEST, MOUNT DIABLO BASE AND MERIDIAN
WALNUT CREEK,CA 94597 FAk 925-932-3519 FEBRUARY, 2007 SCALE: 1"=100'
ENGEO
INCORPORATED
EXHIBIT C
SEA BREEZE II ANNEXATION
Funding and Acceptance :
7529.100.101 .
December 7, 2007
Revised July 21, 2008
ENGEO
INCORPORATED
Funding and Acceptance of Responsibility by the District
An annual assessment is already being levied for residences in the California Tradewinds GHAD
under the provisions of the existing Plan of Control and Engineer's Report.
1. Activation of Assessment
Ultimately, an annual assessment shall be levied on all annexed residential lots within the
Sea Breeze II subdivision. The initial assessment will be initiated by the issuance of a building
;permit for each of the residences. For individual building pen-nits issued between July I and
December 31, the assessment shall be levied by the GHAD on each individual parcel beginning
the first fiscal year following issuance of the building permit. For building permits issued
between January 1 and June 30, the assessment shall be levied by the GHAD on each individual
parcel beginning the fiscal year starting in the calendar year following issuance of the building
permit.
2. Initial Developer Contributions
:As reported, the existing California Tradewinds GHAD has. accumulated reserves from the
collection of assessments from properties within the GHAD in excess of expenses. The
annexation of the Sea Breeze II subdivision into the California Tradewinds GHAD will require a
contribution to equitability match the existing cash reserve. The developer of the Sea Breeze II
subdivision shall contribute to the California Tradewinds GHAD an amount equal to 40 percent
of the total cumulative reserve amount at the time the annexation resolution is adopted by the
Board of Directors. The reserve amount will include cash'and receivables from the Contra Costa
County Tax Collector. These funds shall be provided to the California Tradewinds GHAD prior .
to acceptance of the monitoring and maintenance responsibilities within the Sea Breeze II
subdivision. Funds collected from the levy of assessments while the developer of the
7529.100.101
December 7, 2007
Revised July 21, 2008 1
E1YGEO
INCORPORATED
Sea Breeze II site performs monitoring and maintenance activities may be applied to meet the
required funding amount.
3. Responsibility for GHAD Activities
Once the annexation process is completed, the developer (party that owns the developable
parcels shown on that Final Map) shall have the responsibility to perform all the activities of the
GHAD on property within that Final Map. That responsibility shall become eligible for transfer
to the GHAD at 9:00 a.m. on the day exactly one year after the last residential building pen-nit is
issued by the County (the "Transfer Eligibility Date"), provided that the items listed under item
No. 4 in this section have been completed. This turn-over date may be extended at the sole
discretion of the project developer provided that the assessments shall continue to be levied
during the extension period and that notice of such extension is delivered to the GHAD Manager
at least 30 days prior to the turn-over date. The GHAD Board intends that the period between
the levying of the GHAD assessment and the GHAD becoming responsible to perfomi activities
on property within each Final Map will allow the GHAD to accumulate reserve funds without
incurring significant expenses.
4. Process for Transferring Responsibility for GHAD Activities
Beginning on the Transfer Eligibility Date for parcel(s), the process for transferring
responsibility for performing GHAD activities on such parcel(s) shall be as follows:
(a) In the calendar year of the Transfer Eligibility Date or in any subsequent year, at its
discretion, the developer may apply to the GHAD ("Transfer Application") to transfer the
responsibility for performing GHAD Activities for parcel(s) to the District.
7529.100.101
December 7, 2007
Revised July 21, 2008 2
ENGEO
INCORPORATED
(b) Within 45 days of receiving such notice, a representative of the GHAD shall verify that
all the facilities for which the GHAD will have maintenance responsibility have been
constructed and maintained according to the County-approved plans and specifications
for the individual improvements, and that such facilities- are operational and in good
working order.
(c) Within 15 days of such inspection, the GRAD will send the developer a list ('Punch list")
of all of the items that need to be constricted, repaired or otherwise modified in order to .
comply with the County-approved plans and specifications.
(d) The developer may notify the.GHAD when it has completed the items identified on the
Punch list.
(e) Within 30 days of receipt of such notice, the GRAD shall verify that all Punch list items
have been completed and notify the developer that the GRAD accepts responsibility for
performing all future GHAD activities on the parcel(s), subject to the limitations set forth
in this First Amendment to California Tradewinds GHAD Plan of Control.
As part of the transfer activities, the developer will provide the GHAD, for its use, copies of the
applicable geotechnical exploration reports, grading plans, corrective grading plans,
improvement plans, field-verified geologic maps, as-built subdrain plans, or other pertinent
documents as requested by the GHAD.
7529.100.101
December 7, 2007
Revised July 21, 2008 3
EIVGEO
INCORPORATED
EXHIBIT D
CALIFORNIA TRADEWINDS GEOLOGIC HAZARD ABATEMENT DISTRICT
Right-of-Entry
7529.100.101
December 7, 2007
Revised July 21, 2008
ENGEO
INCORPORATED
Right-of-Entry
District officers, employees, consultants, contractors, agents, and representatives shall have the
right to enter upon all lands within the District boundary, as shown on Exhibit B, for the purpose
of performing the activities described in the First,Amendment to the California Tradewinds
GHAD Plan of Control. Such activities include, but are not limited to: (1) the inspection,
maintenance and monitoring of site improvements including, drainage ditches, storm drains,
outfalls and pipelines; (2) the monitoring, maintenance and repair of slopes, including repaired or
partially repaired landslides; and (3) the management of erosion and geologic hazards within the
open space areas shown on Exhibit B. Should the District need to access private residential lots
to perform any activities under the GRAD Plan of Control, the District shall provide the affected
landowner and/or resident with 72 hours advance notice unless, in the reasonable judgment of
the District, an emergency situation exists which makes immediate access necessary to protect
the public health and safety, in which case no advance notice is required, but the District shall .
infonn the landowner and/or resident as soon as reasonably possible.
The foregoing right-of-entry and indemnity provision shall be recorded in the chain of title for all
residential parcels and common area lots, and it shall be included in all Covenants, Conditions
and Restrictions (CC&Rs) and homebuyer disclosure statements prepared for parcels within the
District.boundary.
7529.100.101
December 7, 2007
Revised July 21, 2008
ENGINEER'S REPORT
for
ANNEXATION OF THE SEA BREEZE II DEVELOPMENT INTO THE CALIFORNIA
TRADEWINDS GEOLOGIC HAZARD ABATEMENT DISTRICT
BAY POINT, CALIFORNIA
DECEMBER 7, 2007
REVISED JULY 22, 2008
EIVGEO
INCORPORATED
TABLE OF CONTENTS
Paye
I. INTRODUCTION...............................................................................................................3
II. BACKGROUND .................................................................................................................3
III. GEOLOGIC HAZARD ABATEMENT DISTRICT BOUNDARIES................................3
IV. SERVICE LEVELS..............................................................................................................3
V. DESCRIPTION OF THE IMPROVEMENTS TO BE MAINTAINED
BYTHE GHAD......................................................................:.......:....................................4
VI. ASSESSMENT METHOD..................................................................................................4
VII. ASSESSMENT LIMIT - BUDGET ....................................................................................5.
EXHIBIT A—LEGAL DESCRIPTION
EXHIBIT B —GHAD BOUNDARY
EXHIBIT C —CALIFORNIA TRADEWINDS GHAD BUDGET
7529.100.101
December 7, 2007
Revised July 22, 2008
EIVGEO
INCORPORATED
ENGINEER'S REPORT
GEOLOGIC HAZARD ABATEMENT DISTRICT-CALIFORNIA TRADEWINDS
SEE BREEZE 11 ANNEXATION
(Pursuant to the Public Resources Code of the State of California, Section 26500 et seq.)
CERTIFICATION OF FILING
This report is presented at the direction of the GHAD Board of Directors. The GHAD is
intended to provide monitoring and maintenance of improvements related to geologic hazard
management within the existing California Tradewinds GHAD including Sea Breeze II and to
levy and collect assessments in order to perform its activities.
The improvements which are the subject of this report relate only to the Sea Breeze 11
subdivision and are defined as any activity necessary or incidental to the prevention, mitigation,
abatement, or control of a geologic hazard, including construction, maintenance, repair, or
operation of any improvement; or the issuance and servicing of bonds issued to finance any of
the foregoing(Section 26505).
This report consists of seven parts, as follows:
1. INTRODUCTION
II. BACKGROUND
III. GEOLOGIC HAZARD ABATEMENT DISTRICT DIAGRAM
IV. SERVICE LEVELS
V. DESCRIPTION OF GHAD-MAINTAINED IMPROVEMENTS
VI. ASSESSMENT METHOD
VII. ASSESSMENT LIMIT-BUDGET PROJECTION
7529.100.101
December 7, 2007
Revised July 22, 2008 1
EIVGEO
INCORPORATED
The undersigned respectfully submits the enclosed Engineer's Report.
Date: By: ENGEO Incorporated
, GE
I HEREBY CERTIFY that the enclosed Engineer's Report was filed on the day of
Clerk of the Board
California Tradewinds Geologic Hazard Abatement District
Bay Point, California
I HEREBY CERTIFY that the enclosed Engineer's Report was approved and confirmed by the.
GHAD Board on the day of
President of the Board
California Tradewinds Geologic Hazard Abatement District
Bay Point, California
APPROVED
7529.100.101
December 7, 2007
Revised July 22, 2008 2
ENGEO
INCORPORATED
ENGINEER'S REPORT
for
ANNEXATION OF THE SEA BREEZE 11 DEVELOPMENT INTO THE CALIFORNIA
TRADEWINDS GEOLOGIC HAZARD ABATEMENT DISTRICT
for the
ESTABLISHMENT OF AN ASSESSMENT LIMIT
I. INTRODUCTION
The Cali fornia.Tradewinds Geologic Hazard Abatement District was formed under the authority
of the California Public Resources Code, Division 17, Section 26500 et seq.
II. BACKGROUND
The Contra Costa County Board of Supervisors adopted Resolution No. 97/297 on June 10, 1997
approving the formation of the California Tradewinds Geologic Hazard Abatement District
("GHAD"). The Contra Costa County Board of Supervisors, acting as the Board of Directors of
the California Tradewinds GHAD adopted Resolution No 2008/_ on September 16, 2008,
approving the annexation of the Sea Breeze Il. subdivision to the California Tradewinds GHAD.
Under Public Resources Code section 26581, the Board of Supervisor then adopted Resolution
No. 2008/i on September 16, 2008, approving the annexation of the Sea Breeze 11 subdivision
to the California Tradewinds GHAD. Approval of the annexation was conditioned upon
subsequent approval of assessments on the territory to be annexed.
III. GEOLOGIC HAZARD ABATEMENT DISTRICT BOUNDARIES
The boundaries for the Sea Breeze II Subdivision portion of the GHAD are shown in the diagram
attached hereto as Exhibits A and B. The Assessor's Parcel Number within the plotted area is
098-210-030.
IV. SERVICE LEVELS
The GHAD's activities are those that are necessary or incidental to the prevention, mitigation,
abatement, or control of geologic hazards including construction, maintenance, repair, or
operation of any improvement; and the issuance and servicing of bonds issued to finance any of
the foregoing.
7529.100.101
December 7, 2007
Revised July 22, 2008 3
ENGEO
INCORPORATED
The GHAD provides for the administration and review of.facilities within the budgeted limits,
including the following services:
1. Oversight of GHAD operations.
2. In conjunction with the County Assessor's Office, setting the annual levying of
assessments on the property tax rolls.
3. Engagement of technical professionals to perform the monitoring duties as described in
the First Amendment to the California Tradewinds GHAD Plan of Control.
4. Performance of GHAD maintenance activities in accordance with the First Amendment
to the California Tradewinds GHAD Plan of Control. These maintenance activities
.include:
• Slopes
• Retaining walls
• Subdrains and subdrain outlets
• Bioswales and associated benches
5. Preparation of annual GHAD budgets.
V. DESCRIPTION OF THE IMPROVEMENTS TO BE MAINTAINED BY THE GHAD
The GHAD-maintained improvements for the Sea Breeze II portion of the GHAD are described
in the First Amendment to the California Tradewinds GHAD Plan of Control dated
March 29, 2007 and revised July 21, 2008. In general, these improvements include a retaining
wall, drainage systems, including bioswales in common areas and on the hillside; subdrains and
reconstructed slopes within the open space area.
VI. ASSESSMENT METHOD
The GHAD-maintained improvements described in Section V are distributed within the
Sea Breeze II boundaries. Maintenance and protection of these improvements provide a special
benefit to all residential property owners within the Sea Breeze II portion of the GHAD. There is
no benefit for properties outside of the Sea Breeze II portion of the GHAD. The Engineer hereby
finds that these properties within the Sea Breeze II portion of the GHAD receive approximately
equal special benefit from the work and improvements within the GHAD. As a result, the
GHAD assessment is distributed equally among all owners of each buildable parcel of habitable
space.
7529.100.101
December 7, 2007
Revised July 22, 2008 4
ENGEO
INCORPORATED
Single-family residential lots will be assessed as one unit. The total number of residential units
within the Sea Breeze II portion of the GHAD is then divided into the annual GHAD budget to
develop the annual assessment amount.
A financial analysis was performed to provide a framework for an operating budget for the
on-going abatement, mitigation, prevention and control of geologic hazards within the GHAD
boundaries of the Sea Breeze II portion of the GHAD. In preparation. of the budget, several
factors were considered including:
• Site Geology
• Proposed Remedial Grading
• Proximity of Geologic Hazards to Proposed Residences, Improvements or Structures
• Site Access Considerations
• Elements Requiring Routine Maintenance, including:
1. Surface Drainage Facilities
2. Graded Slopes
3. Retaining Walls
4. Subsurface Drainage Facilities
VII. ASSESSMENT LIMIT - BUDGET
Based on the estimated expenses for on-going operations, long-term replacement of
GHAD-maintained improvements and allowing for a larger (approximately $10,000) geologic
event at 20-year intervals, a budget was prepared for the purpose of estimating initial assessment
levels .(Exhibit Q. In order to establish a reasonable reserve in the early years of the
Sea Breeze II annexation to the California Tradewinds GRAD, there will be a payment from the
developer as described in the First Amendment to California Tradewinds GHAD Plan of Control
or an initial deferral of GHAD expenses.
The Engineer recommends an annual assessment limit for the Sea Breeze II subdivision of
$410 per detached single-residential unit (Fiscal Year 2007/2008 dollars). The proposed initial
assessment level of$410 for detached single-family units will be adjusted arinually to reflect the
percentage change in the San Francisco-Oakland-San Jose Consumers Price Index for All Urban
Consumers as of June 2007 (216.123). The residential assessments are to be levied in
conjunction with the issuance of a building permit for each of the residential lots. The levying of
the assessment will be as described in the First Amendment to California Tradewinds
GHAD Plan of Control.
7529.100.101
December 7, 2007
Revised July 22, 2008 5
ENGE®
INCORPORATED
EXHIBIT A
LEGAL DESCRIPTION FOR SEA BREEZE II(SUBDIVISION 8830)
PORTION OF THE CALIFORNIA TRADEWINDS GHAD
7529.100.101
December 7, 2007
Revised July 22, 2008
SEA BREEZE II (SUBDIVISION 8830)
PORTION OF THE CALIFORNIA TRADEWINDS
GEOLOGIC HAZARD ABATEMENT DISTRICT
EXHIBIT "A"
ALL THAI' REAL PROPERTY SITUATE IN THE UNINCORPORATEL)
AREA OF CONTRA ' COSTA COUNTY, STATE OF CALIFORNIA,
DESCRIBED AS FOLLOWS:
PORTIONS OF THE SOUTHEAST '/ OF SECTION 9 AND TIIl E
NORTHEAST '/4 OF'SECTION 16, TOWNSHIP.2 NORTIT, RANGE 1. WEsS'T,
MOUNT DIAI3LO BASE AND MERIDIAN, FURTHER DESCRIBL-ED AS
FOLLOWS:
BEGINNING AT THE SOUTHEAST CORNER OF SAID SECTION 9,
THENCE, (1) SOUTH 88°20'08" WEST, 660.90 FEET;
THENCIE, (2) SOUTH 01.°38'50" EAST, 1.30 FEIET 'TO THE BEGINNING OF
A NON—TANGENT CURVE, CONCAVE 'I.10 TITF., SOUTIIEAS'T, A RADIAL,
LINE TO WII:ICI BEARS NORTH 01°38'50" WEST;
THENCE, (3) ALONG TI-IE ARC OF SAID'CURVE, I-IAVING A RADIUS Ol
74.00 FEET, A CENTRAL, ANGLE OF 74-1110",10", A CI ORD LENGTH OF
89.26 FEET, AND AN ARC LENGTH OF 95.81 FEET;
THENCE, (4) SOUTH 14°10'00" WEST, 20.04 FEE'I';
THENCE, (5) SOUTH 23°21 '39" EAST, 11.41 FEET TO TI-TI? NORTTI RIGHT
OF WAY OF RAPALLO LINE ANDTHE E BL-EGINNING OF A.NON—TANGENT
CURVE, CONCAVE 'TO '1-'I=11E SOUTH, A RADIAL LINE TO WHICH BEARS
NORTH 28056'27" EAST;
THENCE, (6) ALONG SAID RIGHTOF WAY AND ALONG TI-31, ARC OF
SAID CURVE, HAVING A RADIUS OF 128.00 FEET, A CENTRAL ANGLE
OF 34026'01", A. CHORD LENGTH OF 75.77 FEET, AND AN ARC LENGT".H
.OF 76.93 FEET;
THENCE, (7) LEAVING SAID RIGHT OF WAY NORTH 51°31 '56" EAST,
17.72 FLEET;
THENCE, (8) NORTH 14°10'00"EAST, 18.23 FEE--CTO THE BEGINNING OF
A TANGENT CURVE, CONCAVE TO THE SOUTI LEAST;
THENCE, (9) ALONG TI-IE ARC OF SAID CURVE, HAVING A RADIUS OF
132.00 FEET, A CENTRAL ANGLE OF, 71-53'31", A CHORD I..ENGT[I OF
36.35 FEET; AND AN ARC LENGTH OF 36.47 FEET;
TIIENCE, (10) NORTH 30°19'53" WEST, 17.72 FEET;
THENCE, (11) SOUTH 88020'08" WEST, 239.03 FEET;
THENCE, (12) NORTH 01 039'52"WEST, 230.00 FEET;
TI-IENCE, (l 3)NORTI1. 88°20'08" EAST, 1.025.94 FEET;
THENCE (14) SOUTH 00°54'38" WEST, 230.23 :FEET TO THE POINT OF
BEGINNING.
TILE LAND DESCRIBED HEREIN CONTAINS 5.51 ACIZES OF LAND,
MORE OR LESS. .
�i�,G�.l---- SCG END.OF DESCRIPTION
L.S 3J72 FOR MERIDIAN ASSOCIATES, INC.
uo. 06/30/2008 PAUL CANUMAY
L.S. 3272
EXPIRES 06/30/2008
of CA��F
ENGEO
INCORPORATED
EXHIBIT B
BOUNDARY OF THE SEA BREEZE 11 PORTION OF THE CALIFORNIA TRADEWINDS GHAD
i
7529.100.101
December 7, 2007
Revised July 22, 2008
�\ t -S01'38'S0"E�2
\ 098-520 098-520
\ 085
! 063- 098-520--101 � 1.30 vl
SECTION SECTION R=)4.00' " \�NOI'3 0"W(R� w 1
\` 10 15 0=74'11'10 4 v►
C-89.26' O
14 sDD 54'3a'W - - - - L==95.x1 S1410'00W u�
L z3o.z3' = . 20.04' C
SE BION SECTION r 1 9
S23'21'39"E
POINT OF BEGINNING I ABBREVIATIONS: Q 11.41
SOUTHEAST CORNER OF I! R=RADIUS R=132.00'
SECTION 9 T. 2 N., R. 1 W., . D=DELTA (INCLUDED ANGLE) D=15'49'43"
M.D.B. & M.
c=CHORD C=36.35'
L-ARC LENGTH L=36.4%' �6
j (R)=RADIAL BEARING N14'10 00"E R=128.00'
10 18.23' D=34'26'01"
N30'19'53"W L 76.93'
17.72' Q
N5t 117 .)"E N05'29'34"W (R)
17.72'
DETAIL 'A'
jto / \ SCALE: V=50'
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I 098-210-030
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552
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DETAIL 'A' �Q?� OF CAt\�
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SCALE IN FEET
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N01'39'52"W 230.00'
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098-484-004 19S 59
o EXH�fBfT B
SEA BREEZE 11(SUBDIVISION 8830)
PREPARED BY: ERIDIAN PORTION OF THE CALIFORNIA TRADEWINDS GHAD
e:^ ASSOCIAms,INC. POIMONS OF THE SOUTHEAST 1/4 OF SECTION 9 AND THE
MIL I.:NGINGI:ItING • PLANNING • SURVEYING NORTHEAST 1/4 OF SECTION 16 TOWNSHIP 2 NORTH,
1340TREaBOULr:VARD SME 130 PHONE„92S-932.4906, RANGE 1 WEST, MOUNT DIABLO BASE AND MERIDIAN
WALWITCREEK,CA 94.577 FAX:92S-932-3519 FEBRUARY, 2007 SCALE: 1~=100'
EAIGEO
INCORPORATED
EXHIBIT C
California Tradewinds GHAD Budgets for
Sea Breeze II Subdivision
7529.100.101
December 7, 2007
Revised July 22, 2008
EAIGEO
INCORPORATED
EXHIBIT C
California Tradewinds Geologic Hazard Abatement District
Sea Breeze II Annexation
Budget
ASSUMPTIONS
Total No. of Single Family Residential Units 17
Annual Assessment per Unit(current$) $410
Annual Adjustment in Assessment (estimated) 3.0%
Inflation (estimated) 3.0%
Investment Earnings (estimated) 4.0%
Frequency of Large-Scale Repair(years) 20
Cost of Large-Scale Repair(current$) $10,000
ESTIMATED ANNUAL EXPENSES IN 2008 DOLLARS
Administration and Accounting $800
County Staff Services $500
Membership Dues for California Association of GHADs $110
Professional Services including Site Monitoring (2 events per year) $2,000
Maintenance and Operation (Subdrain Outfalls and Sediment Removal) $2,260
Slope Stabilization and Erosion Protection $500
Capital Improvement(Bioswale Replacement) $1,080
TOTAL $1-250
7529.100.101
December 7, 2007
Revised July 22, 2008
ENGEO
INCORPORATED
California Tradewinds Geologic Hazard Abatement District
Sea Breeze II Annexation
Estimated Budget
4 -Years
Projected Income
Fiscal Year Fiscal Year Fiscal Year Fiscal Year
2007/2008 2008/2009' 2009/2010 2010/2011
Annual Levy $410.00 $422.30 $434.97 $448.02
Amount
Assessed Units 0 17 17 17
Projected Income $0 $7,179 $7,394 $7,616
Estimated GHAD Expenses
Administration and $2,500 $824 $849 $874
Accounting
GHAD Expenses2
(See Annual $03 $6,273 $6,461 $6,655
Expense Budget)
Total Estimated ,
Expenses $2,500 $7,097 $7,310 $7,529
Projected
Cumulative ($2,500)3 $825 $166 $253
Reserve`'
I Maintenance and monitoring responsibilities may be transferred to the California Tradewinds GRAD.
Assumes an inflation rate of 3 percent per year.
3 GHAD Monitoring and maintenance responsibilities to be funded by DeNova Homes.
4 Does not include investment income on GRAD reserve funds.
5 Assumes that within the first possible year of GHAD Open Space responsibility that all of the monitoring,
maintenance and repair expenses estimated in the projected budget will occur. In our experience with other
GHAD's,these expenses occur over a number of years,therefore the cumulative reserve amount shown should be
considered conservative.
7529.100.101
December 7, 2007
Revised July 22, 2008