HomeMy WebLinkAboutRESOLUTIONS - 08152017 - 2017/297
ENGINEER’S REPORT
FOR
ANNEXATION No. 4
TO
CONTRA COSTA FLOOD CONTROL
AND
WATER CONSERVATION DISTRICT
DRAINAGE AREA 76A
PREPARED BY THE STAFF OF THE
CONTRA COSTA COUNTY FLOOD CONTROL
AND
WATER CONSERVATION DISTRICT
255 GLACIER DRIVE
MARTINEZ, CA 94553
June 15, 2017
1. RECOMMENDATION: It is recommended that the Board of Supervisors authorize
Annexation No. 4 to Drainage Area 76A and that the benefit assessments pursuant to
the Benefit Assessment Act of 1982, Government Code Sections 54703
through 54720, inclusive, be adopted for the area to be annexed.
2. DRAINAGE AREA LOCATION: Contra Costa County Flood Control and Water
Conservation District (District) Drainage Area 76A, formed on December 1, 1987,
per Board of Supervisors Resolution No. 87/726 is located northeast of the
intersection of Miranda Avenue and Livorna Road in the unincorporated area of
Alamo. The specific location of the areas to be annexed are described in Exhibit A
and shown in other exhibits on file for Minor Subdivision 16–0004 in the Engineering
Services division of the Public Works Department.
3. ANNEXATION AREA: The proposed annexation consists of two lots within Minor
Subdivision 16-0004 that contain approximately one acre. One parcel is 39,033 sq. ft.
and the other parcel is 23,708 sq. ft.
4. REASON FOR ANNEXATION: On December 1, 1987, Drainage Area 76A was
established to provide a legal entity under which benefit assessments could be levied
for maintenance of two detention basins. The basins were constructed because the
creation of new impervious surface on previously undeveloped land downstream of
the basins was expected to increase flows into Miranda Creek. The basins regulate
stormwater flowing into the creek in order to mitigate the possibility of flooding.
Minor Subdivision 16-0004 benefits from this flood protection.
Like all man-made facilities, the detention basins require annual maintenance to
ensure that they operate as designed. It is, therefore, equitable in the opinion of the
District that all properties benefitting by the existence of the detention basins pay a
fair share toward their annual maintenance. Therefore, District staff recommends that
subdivisions and other developments that will increase the stormwater flow to
Miranda Creek channel be annexed to Drainage Area 76A and have the benefit
assessment levied. The annexation to Drainage Area 76A provides a legal entity
under which the benefit assessment for maintenance of the detention basin and storm
drains can be levied, after a vote has been taken.
5. FACILITIES TO BE MAINTAINED: Monies collected will be used for the
maintenance of the detention basins and operation of the Drainage Area. Maintenance
will include, among other things, silt removal, bank repair, landscaping, irrigation
water, and weed removal.
6. ESTIMATE OF ANNUAL COSTS: The fiscal year 2017–18 maintenance budget for
the basins is approximately $103,700. A breakdown of these costs is as follows:
A. Structure maintenance $ 4,200.00
B. Sediment removal $20,000.00
C. Vegetation management $20,300.00
D. Inspection and investigation $59,200.00
Estimated Total Annual Costs $103,700.00
7. ANNUAL BENEFIT ASSESSMENT: The Annual Benefit Assessment to be
assigned to each of the parcels of the area to be annexed should be based upon its
prorated share of the stormwater runoff. Its proportional share is determined by the
amount of impervious area to be created on each parcel.
Attached is Table A, which is a summary of the two parcels to be annexed to
Drainage Area 76A. Table A also indicates the impervious area to be created by each
parcel of land. The table indicates that the parcels to be created will generate a total of
an additional 11.61 impervious area units (IAU). Each IAU is 1,000 sq. ft. of
impervious area.
8. BENEFIT ASSESSMENT IMPLEMENTATION: The annexation to Drainage
Area 76A provides funding for the maintenance of the detention basin and associated
drainage structures. The annexation also provides that a levy be authorized by a vote
of the various properties involved in the annexation. Staff recommends that: 1) all
new parcels be assessed in the fiscal year following the filing of the parcel/final map;
2) all existing parcels of land containing impervious areas be assessed in the fiscal
year following the filing of the final map; and, 3) that a vote of the property owners
involved in the annexation be held to allow a maximum benefit assessment of
$159.55 per IAU to be adopted, such maximum to be utilized in case of a need for
emergency repairs to the basin and subject to annual adjustment to account for
inflation (per Caltrans’ published “Price Index for Selected California Construction
Items,” or equivalent).
CO:cw
\\PW-DATA\grpdata\fldctl\CurDev\CITIES\Alamo\MS 16-0004, 281 Livorna Heights Road\DA76A Annexation #4\MS 16-
0004 DA 76A Annexation Engr. Rpt..doc
6/15/17
Table A
Drainage Area 76A Annexation No. 4
(1)
Parcel Designation
(2)
Parcel Size
(square feet)
(3)
Number of IAU
per Parcel*
(4)
FY 17–18
Maintenance Cost
Per IAU**
(5)
FY 17–18
Assessment
(Col. 3 x Col. 4)
(6)
Maximum
(Emergency)
Assessment***
(Col. 3 x $159.55)
Lot 1 MS 16-0004 39,033 6.43 $90.62 $582.72 $1025.91
Lot 2 MS 16-0004 23,708 5.18 $90.62 $469.44 $826.47
MS 16-0004 total 11.61
Current DA 76A IAU 1533.22
New DA 76A IAU 1544.83
Notes:
* Source: Average Impervious Surface Amounts, Report on Impervious Surface Drainage Fee Ordinance, January 5, 1982, Table 8.
** Maintenance Cost per IAU = Total Maintenance Cost of $103,700 / Total number of IAU’s.
*** Maximum Assessment determined by adjusting the maximum assessment approved in DA 76A formation document ($65.07) by Caltrans “Price Index
for Selected California Construction Items” to current year, resulting in $159.55. Maximum assessment value is updated annually.
"Accredited by the American Public Works Association"
255 Glacier Drive Martinez, CA 94553-4825
TEL: (925) 313-2000 FAX: (925) 313-2333
www.cccpublicworks.org
Julia R. Bueren,
ex officio Chief Engineer
Mike Carlson,
Deputy Chief Engineer
DATE:
TO:
FROM:
August 15, 2017
Members — Board of Supervisors
Julia R. Bueren, Chief Engineer
SUBJECT: Results of the Ballots Cast in the Proposed Annexation of Minor
Subdivision MS 16-0004 into Contra Costa County Flood Control and
Conservation District Drainage Area 76A
I, Julia R. Bueren, Chief Engineer of the Contra Costa County Flood Control and Water
Conservation District, having canvassed the return of all ballots cast in the election to
approve the annexation of Minor Subdivision MS 16-0004 into Contra Costa County
Flood Control and Water Conservation District Drainage Area 76A held between June
30, 2017, and August 15, 2017, do hereby certify the following to be a full, true, and
correct Statement of Results of all ballots cast on the following measure:
Annexation No. 4 to Drainage Area 76A and Adoption of Annual Assessments
for Minor Subdivision MS 16-0004
YES _1_ NO __0__
I further certify that the total number of ballots cast in the proposed annexation of
Minor Subdivision MS 16-0004 into Drainage Area 76A at said election was two and
attached hereto are the total ballots received for and against annexation and
assessment.
RU:ru
G:\fldctl\CurDev\DA Annexations\DA 76A MS16-0004\memo to BOS Ballot Results.docx
c: Mike Carlson, Deputy Chief Engineer
Tim Jensen, Flood Control
Teri E. Rie, Flood Control