HomeMy WebLinkAboutAGENDA REPORT 2005 0202 CC REG ITEM 10GITEM 10 . GA
CITY OF MOORPARK, CALL
City Council Meetinc
of a -a - 4,006-
ACTION:�.t�
Moorpark City CounciISY:
Agenda Report
To: The Honorable City Council
From: Kenneth C. Gilbert, Director of Public Works �l
Date: January 20, 2005 (Council Meeting 2 -2 -05)
Subject: Approval of Plans and Specifications and Authorization
to Advertise for a Project to Construct a Sub -Drain on
Little Hollow Place
DISCUSSION
A. Ground Water Problems
1. General: Certain areas of the City have soil conditions
which are not conducive to the ''normal'' percolation of
surface water. The existence of clay lenses and other such
factors create conditions which cause water to remain
''perched'' j ust below the surface and to pool and /or flow
on the surface.
2. Pavement Problems: Perched ground water which infiltrates
the base material under asphalt pavement, is a major cause
of the deterioration of the structural integrity of the
street pavement. Such conditions cause the pavement to
crack and to develop potholes.
3. Sidewalk Problems: Perched ground water is often forced to
the surface when there is no where else for it to go.
Sometimes this water flows across a sidewalk and fosters
the growth of algae on the sidewalk. Sometimes these
conditions create a slippery surface on the sidewalk, which
is a potential hazard to the public.
4. Sub- Drains: In the past the City has installed sub- drains
to intercept and convey groundwater near the surface to an
existing storm drain. The design for such Sub- Drains is a
perforated pipe in a rock - filled trench, surrounded by a
geo- fabric to prevent fine materials from being washed
away.
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Little Hollow—ad-0501
Little Hollow Sub -Drain Project
February 2, 2005
Page 2
B. Little Hollow Place
1. Pavement Problem: A number of months ago staff responded to
a failed pavement problem on Little Hollow Place. It was
discovered that water was flowing from the pothole - a
broken water line was suspected. Upon excavating the site
it was discovered that the subsurface condition of the soil
was thoroughly saturated by perched groundwater and that
subsurface flows from surrounding areas created hydrostatic
pressure causing water to flow up through the pavement and
into the gutter.
2. Project Plans / Specifications: Plans and specifications
have been prepared for the construction of a sub -drain at
the lip of gutter along the east side of the street. The
location and limits of the project are generally shown in
the diagram attached as Exhibit 1.
3. Pavement Rehabilitation: This project will include the
removal and replacement of pavement and base in a limited
area showing severe stress. It is the intent of staff to
include this street in an upcoming pavement resurfacing
project which will apply an ARAM (Asphalt- Rubber Aggregate
Membrane) pavement surface to the street.
4. Notice: It is the intent of staff to notify the affected
property owners of the City's intent to construct this
project.
C. Fiscal Impact: Construction
1. Construction Cost Estimate: A preliminary estimate of
project costs is as follows:
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .................. . ........... . ....................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Element
Design
Construction
Constr Contingency (10 %)
Inspection
Total
: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
** Note: Inspections will k
Cost
6,000
30,000
3,000
1,000
40,000
.................................................... .............................
performed by C.: ity staff.
2. Budget: There is no approved appropriation or Budget for
this project. Staff has deferred the presentation of a
Budget Resolution funding the project, until the award of
the construction contract.
3. Funding Source: The recommended funding source for the
project will be the Gas Tax Fund.
Little Hollow—ad-0411
Little Hollow Sub -Drain Project
February 2, 2005
Page 3
D. Plans and Specifications
A review copy of the Plans and Specifications for the subject
project has been placed on top of the file cabinets in the
City Council Conference Room.
E. Protect Approval -- Desian Immunit
It is recommended below that the City Council approve the
project plans and specifications in order to document City
Council approval of the scope and design of the project. Such
approval is also required for the purpose of establishing
design immunity pursuant to Section 830.6 of the Government
Code of the State of California.
F. Schedule
It is anticipated that bids for the subject project will be
opened and presented to the City Council in March, with
construction to start in April.
STAFF RECOMMENDATION
Approve the plans and specifications for the subject project and
authorize staff to advertise for receipt of bids for construction
of the project.
Attachments:
Exhibit l: Location Map
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