HomeMy WebLinkAboutMINUTES - 03092004 - C.14 TO: BOARD OF SUPERVISORS AS THE BOARD OF DIRECTORS, BLACKHAWK GEOLOGIC
HAZARD ABATEMENT DISTRICT CHAD /
FROM: MAURICE SHIU,PUBLIC WORKS DIRECTOR
DATE: March 2, 2004
SUBJECT: ACCEPT and APPROVE the Blackhawk Geologic Hazard Abatement Districts Reserve Study,Danville,
California. (WO 5147),
SPECIFIC RF-QUEST(S)OR RECOMMENDATION(S)k BACKGROUT AND JUSTIFICATION
I. Recommended Action:
ACCEPT and APPROVE the Blackhawk Geologic Hazard Abatement Districts Reserve Study,
II Financial Impact:
There is no impact on the County General Fund. The Blackhawk GHAD is funded through revenues generated by
County Service Area M-23 (CSA M-23).
111. Reasons for Recommendation and Background:
The CHAD expenditures are subject to periodic fluctuations based on weather conditions and resultant
landsliding. Therefore, it is critical that the GHAD maintain a reserve fund in preparation for emergency
situations. The reserve study provides an economic model to guide the budgeting process and assure the
financial stability of the GHAD.
Continued on Attachment:X SIGNATURE: ``
M .
RECOMMENDATION OF BOARD COMMITTEE
_
.APPROVE _ATHER
SIGNATURE (S):
ACTION OF BOO"N MARCH 09, 2004APPROVED AS RECOMMENDED Xx OTHER
I hereby certify that this is a true and correct copy of an action
taken and entered on the minutes of the Board of Supervisors on
the date shown.
VOTE OF SUPERVISORS MARCH 09 2004
Xx U;NANIMOUS(ABSENT I & Its l ATTESTED: f
AYES: NOES; JOHN SWEETEN,Clerk of the Board of Supervisors and County
ABSENT: ABSTAIN: Administrator
SE:emmB ,Deputy
G:1CsrpDatnl5pDistlBoerd Ordersl20CA\0302-04 BO Reserve Siudy.doc y A.
Orig.Dlv: Public Works(Special Districts)
Contact: Skip Eppedy(313.2253)
ec: County Administrator
County Counsel
Kleinfelder,Inc,
SUBJECT: ACCEPT and APPROVE the Blackhawk Geologic Hazard Abatement Districts Reserve Study,
Danville, California. (AVO 5147).
DATE: March 2, 2004
PAGE: 2
N. Consequences of Negative Action:
Without Board Approval, there is a risk that the CHAD will not make sufficient contributions to the
Reserve Fund which may threaten the depletion of the fund in emergency situations.
......................
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BLAC=ABA�
VK GEOLOGIC HAZARD
EVIENT DISTRICT
{ k
SERVESTUDY
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November 18,2003
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4kLLE.Cit 94506
925.964.0825(w,) I
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B LAC KHAW l
GEOLOGIC
HAZARD � �
; November 18,2003
ABATEMENT
D i s T Rl C T Blackha wk Board of Directors ,
Contra Costa County Board of Supervisors
c/o Skip c�xEpperly, GHAD Liaison
IicHA D D. S r 1
.255 Glazier Drive #
GENERAL MAxGr Martinez, CA 94553-4897 '
j
KLEiNFELDE , INC.
4 I
sunniCT: Budget Reserve Study
Ladies and Gentlemen;
In accordance with the direction of the Contra Costa County Beard of Directors the
BlackhaWk Geologic Hazard Abatement District is submitting the attached Budget
Reserve'Study. The purpose of this study is to povide a long term plan for building
and maintaining the GRAD reserve fiord. The -eserve fund is intended to provide
financing for emergency slide repairs and major slide repair projects resulting from
s events not anticipated in the annual budget at..d for long term maintenance and
replacement of GHAD assets. The determinatipn of the budget requirements for
,emergency repairs and subsequent major projects is based on the GHAD's history
;and published records of the frequency of l�ndsliding associated with rainfall
intensitydata. The evaluation of the replacemerit of GHAD assets is based on past
maintenance records and an anticipated service lie in an expansive soil environment.
At best, the prediction of future rainfall events and associated landsliding is
guesswork, but the attached reserve study has been based on a rational statical
approach., i
i
IVery truly yours, #
i � I
iackhaWk Geologic Hazard Abatement District
e
ichard Short
neral Manager
le der, Inc.
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BsACVJiA Y PWA CIPW
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Ntav w,CA 94506eser ve Study � Page 2
925.964.0823
92=.964.0825(ro) # (;
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Reserve Stutiv
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k This report documents the results of a reserve Istudy performed for the Blackhawk
Geologic Hazards Abatement District. The study provides an analysis of the repair
and replacement requirements for the District's major asset components and the costs
for emergency slope repairs and major landslid projects. The study recommends a
long term funding plan to meet these obligations. The evaluation of asset
r maintenance and repair costs and the frequency d magnitude of major slope repairs
was performed by the GHAD staff. The fundi ig plan evaluation was prepared by
John D. Beatty & Company. This study was pe formed in accordance with industry
standards established by the Professional As dation of Reserve Analysts. The
intent of this study is to provide the District with a plan to meet future obligations for
major landslide repairs and asset maintenance. The essential elements of this study
are:
i
1. Identification of the major asset components that the district is obligated to
maintain
2. Identification of rainfall hazards and est+ated cost of major repairs resulting
from resultant landslides.
3. Current estimate of the useful life of eachIasset component
4. Current estimate of the remaining life ofh asset component
5. Current estimate of the replacement cost f each asset component
6. Current estimate of the total annual co bution necessary to maintain the
major components
7. Current estimate of the amount of cash ireserves necessary to maintain the
major components
8. Disclosure of the current amount of 4cumulated cash reserves actually
funded
9. A general statement of methodology
S }
'SCOPE
This study is aligned with the district`s fiscal year and establishes July 1, 2003
through June 30, 2042 as the period of time for which reserve expenditures and
reserve fund balances are projected. j
!DESCRIPTION i./i` GHAD ASSETS
l
Y
The GHAD assets include storm drain systems, A�58 drain systems, retention basins,
orizontal drains, piezometers, settlement mon1tors, subdrain outlet pumps, and
ebris benches.A brief description of each of the assets is presented below.
I
>BIACKHAWY PkAZA CIRCLE
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Storm Drain Systerm
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The Phad maintains about 200 catch
basin' throughout the Blackhawk
level pent. The operation of the catch
basin inlets is critical for the collections of
storm water runoff. Clogged inlet grates
i' can I result in flooding of nearby
propeOes. . .iter recent winter storms
't
sevend inlet structures were modified to
t
enlark a the catchment volume and prevent
effl DW as shown in this photo.
i
i B-58 Drain Systems
Y
_ The 58 concrete lined drainage ditches
Y make up the major component of the
hillsi erosion protection and storm
rano collection system. The Blackhawk
t
>.A GHAT maintains 63,486 linear feet or
over 1R miles of B-58 ditches. Because of
the smelling and shrinkage of expansive
soils 4nd associated slope creep ongoing
r 1 V
� ��a� '• �� ' '� l and replacement of 8-58 and
ditches is required to keep them in
operat on.
i
Ret�on.Basins
r s g k } Y The Blackhawk development was
k ,s con ted with six retention basins
design d to collect and retain excessive
storm runoff until the storm water
drainae system has time to accommodate
the full rainfall volume of a storm. Three
of the ibasms are used for flood retention
solely and three are integrated into the
Country Club water features located on
the got F course fairways.
3
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925.964.0823
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Horizontal Drains
Dut,ing the original project development
! ' grading operations and in the years
afterward over 267 horizontal drains
have been installed. Horizontal drains
are installed in native hillsides to lower
ry gro d water and increase slope
sta `lity. .Annual inspection and
maintenance of the outlets is necessary
to �eep the drains flowing without
` f obs ruction.
` G
Rezonteters j
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ti The depth to ground water has a great
`#{ in#lu�nce on the stability of slopes. The
6, Gha d has installed numerous piezometers
(grot nd water monitoring wells) at
` varix is locations where slides have been
repai ed or are suspected. Currently, the
GHAP monitors 75 active piezometers.
Theaiezoeters are protected with a
locke cap.
`
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SeNentent Monitors
Settlet6ent can occur as a result of various
r
causesE including fill consolidation and
landsli ing. The GH ALD
installs
4 r monis(ring gauges on structures so that a
time re cord can be maintained to establish
the rat" of settlement.
5 BIACDI WK PIA7A CIPCCE
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925.964.0823
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Subdrain Outlet Pumps
i ' At ine location near Hole Number 1 on
the'.--akes Course a subdrain is located
23 et below grade. In order to drain
ih
the iubdrain system an outlet pump was
instilled. The CrHAD maintains the
outl+' pump.
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€Debris Benchers
i
Thro out the development debris
J. bench s have been installed at the toe of
F steep glopes that are located tight against
privat+ property limits. Ile purpose of the
debris benches is to provide a buffer zone
for sion deposits to accumulate before
they fl w onto private property. In some
tt
zes wooden wall is constructed to
e the volume of the catchment area.
Period ally the accumulated debris is
. .K,. cleaned to restore the catchment volume.
""FALL 1L4ZARDANALYSIS
i 4
The incidence of landslid%ng is directly correla i d to the seasonal amount and the
`daily intensity of rainfall. Therefore, in order tc develop a model for GRAD slide
repair expenditures an evaluation of the rainfall records and slide frequency was
1performed. Historical records at Blackhawk indicate that in winter seasons where the
}total rainfall exceeds 1.5 times the average rain alI year the number and damaging
effect of landslides increases. In a study performed by Professor Duncan at the
;University of California Berkeley in 1964 the records showed that the number of
landslides in the Danville area of Contra Costa bounty increased dramatically after
;the intensity of rainfall rose above 3 inches per d4y. This data correlates closely with
the experience of December 15, 2002 when over 60 slides occurred after 3.5 inches
of rain occurred in an ll-hour period.
<The criteria established for winter conditions tha would require expenditures above
;the normal budgeted amounts included years vith 1.5 tunes average rainfall and
dears when over 3 inches of rain fell in one days The records for the last 100 years
"how that the annual rainfall exceeds 1.5 time normal once every 12.5 years and 3-
�inches of rain in one day occurs at a rate of once every 25 years. The expenditures
3 BLACWXWK PLAZA CIRCEF. I
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925.:+64.0823 �
925.964M25(FAx)
associated with these events were estimated based on recent events to be $3,000,000
for 1.5 times the normal year and$500,000 for 3-finches of rain in one day.
MEMODOLOGY
1 A cash flow methodology was used to determihe the annual reserve contribution.
I `The underlying premise of this reserve funding approach is to establish a
contribution level that will allow the district to maintain a positive balance in the
reserve fund while meeting all anticipated maintenance obligations. The cash flow
method allows the district to achieve this goal without the unnecessary over funding
of reserves. Also, as the interest earned on the Ireserve fund will not totally offset
inflations projections were made using the carr nt inflation factor and an average
interest rate on fully insured certificates of depos t.
in prepaaiing this study, a comprehensive list o major components was developed
ben,
and information was compiled on the type, nu;1;Wage and cost of each of these
components. In gathering this data, certain assumptions were made about costs,
conditions; and future events and circumstances that may occur. Some assumptions
inevitably will not materialize and unanticipated events and circumstances may
} occur subsequent to the date of this report. The-efore, the actual replacement cosh
and remaining lives may vary from this report aired the variations could be material.
All life :expectancies were based on reasonable industry experience for equipment
and material and, unless specifically noted, all components were in a reasonable and
ordinary condition.
For a component to be included in this study,theallowing criteria must be met:.
1. The maintenance of the component is the resperisibility of the district;
2. The maintenance of the component is not included in the annual operating budget;
3.The esiiinated useful life of the component is greater than one year, and
4.The estimated remaining life of the component is less than 50 year.
5. The repair of the landslide falls in the guidelines established by the Plan of
a Control and the current GHAD Policy.
This study is intended to reflect the estimated r`placement cost of the components
and is not intended to project the actual cost f the work. when performed. This
imitation is necessary, as it is virtually irnpo ble to predict with any degree of
r ertainty;the myriad factors that will impact cos at a future date. Because of this
2
qualification, it is necessary for the results of th s study to be reviewed annually to
reflect any meaningful changes in use or siguficant increases in labor and/or
materials,costs. The funding for this study has ,a threshold goal of approximately
500,000. This means that the projected ending bilance for each fiscal year is at least
500,000, This margin can help to offset any unf reseen or out of the ordinary repair
r replacement expenses. Additionally, it can be used in subsequent years as a source
f funds Ifor reallocation of the life cycles shoWd the aging of any components
elerate abnormally. !
3$LACKfiAWK PLkZA CIRCLE
S-m IG
DArItnm CA 94506 ; serve Study Page 7
'925,964825(fu?
ASSUMPTIONS
The findings of this study indicate that it will be necessary to adjust the annual
reserve contribution in order to meet projected expenditures and keep pace with
3
inflation.These findings are based upon the following:
1. Projected reserve fund balance as of July 1}2803 $707,076
2. Reserve contribution for fiscal year 2003/4... ` ..............................$250,000
3. Reserve contribution for fiscal year 2004/5 .... .................................$26'7,500
4.Assumed annual inflation rate ...................... ..................................... 2.0°1a
5. ,All " fter tax" interest earned on reserve fian investments will be retained in the
reserve fund.
1 :
CONCLUSIONS AND RECOMMENDATIONS
R
The results of this study as illustrated on the;following figures shows that it is
feasible to meet the projected expenditures, provided that sufficient annual
contributions are made to the reserve fund. Since]the predictability of future events is
highly variable the reserve fund analysis should'be updated annually to account for
the actual expenditures and amounts available r the reserve fund. You will note
that the actual dollar amounts fro the 02/03 Fisc Year end balance differs from the
study. the intent of the study is to provide a ethodology and guideline for the
fund. The actual amount of contribution from e 03/04 budget will depend on the
conditions of the winter months.
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PROJECTED EXPENDITURES
al+RWK PLAZA QWI-t
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am,CA 94506 Reserve Study Page 9
25.964.4823
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5 BLACK€IAWK PLAZA CIRCLE
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DA. ILLS.Ck 94506 Reserve Study Page 19
925,964-0823
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