HomeMy WebLinkAboutAGENDA REPORT 1995 0419 CC REG ITEM 11MITEM 11• N P
City of Moorparl�
To: The Honorable City Council
From: Ken Gilbert, Director of Public Works
Date: April 10, 1995 (Meeting 4- 19 -95)
Subject: Consider Change to the Scope of Work for the
Tierra Rejada Road Slurry Seal Project
OVERVIEW
This report discusses the merits of 1) revising the subject
contract by deleting the proposed application of Type II
Slurry Seal on Tierra Rejada Road; 2 ) installing a subsurface
drainage system in the project area; and, 3) constructing an
Asphalt Overlay on this street segment in -lieu of Slurry
Seal.
BACKGROUND
1. On October 5, 1994, the City Council awarded a contract
for the construction of road repairs and the application
of a Type II Slurry Seal to that portion of Tierra Rejada
Road from a point west of Spring Road westerly to the
Arroyo Simi Bridge.
2. On February 1, 1995, the City Council approved an increase
in the appropriations and the budget for the project in
the amount of $25,000 to fund a contract change order to
increase the amount of asphalt removal and replacement.
DISCUSSION
A. Subsurface Water Problem
With the recent rains it has become apparent the intrusion
of subsurface water into the base material for Tierra
Rejada Road is, has been and (if left unchecked) will
continue to pose a threat to the longevity of the street.
It is suspected that this may be one of the major causes
for the early deterioration of Tierra Rejada Road and the
recent dramatic increase in the quantity of asphalt
removal and replacement required for the subject project.
The present Slurry Seal project has been placed on hold
until this matter can be adequately discussed and a plan
of action determined.
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Subsurface water can be intercepted and conveyed to storm
drain inlets by means of a subsurface drainage system.
Such a drainage system consists of perforated plastic
pipe, wrapped in geofabric and placed in a rock filled
trench. The drain line may be place at the lip of gutter
or (where possible) behind the sidewalk at the edge
landscaped slope. It is estimated that it will be
necessary to install approximately 15,000 linear feet of
this drain line in order to adequately address the
problem. The estimated cost for this improvement is
$230,000, including design, inspection and contract
administration.
B. Change Order Deferring Slurry Seal
If the City Council determines that it would be prudent to
construct the above described drainage system, it is
recommended that consideration be given to amending the
pending Slurry Seal contract to delete the application of
the Type II Slurry Seal. Work under that contract would
be limited to the asphalt repair work and crack sealing
work performed to date. A summary, of contract costs to
date is as follows:
Initial Contract Amount 106,563
Current Contract Amount 133,768
Cost of Work Completed 85.752
Cost Reduction 6.1,533
Less Mobilization Etc. -----5,000
Net Cost Reduction 48,146
A figure of $5,000 has been identified as the estimated
additional cost to the contractor for the mobilization of
his manpower and equipment just prior to the cessation of
work. Staff is in the process of negotiating the final
cost.
C. Asphalt Overlay
As you are aware, the quantity of asphalt removal and
replacement (R &R) patch areas increased dramatically from
the quantity estimated during the design of the project.
Normally, it would be preferable to keep the amount of R &R
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Tierra Rejada Slurry Seal
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areas to a minimum when applying a Slurry Seal to an
arterial street. Too many patches under slurry seal
applied to a street which accommodates higher speeds leads
to "ridability" problems - --- or a ride which is not as
smooth as should be expected.
In that staff is asking the City Council to consider
approval of the construction of the above described
drainage system and, as a minimum, the postponement of the
application of a Type II slurry seal, consideration should
be given to changing the design for the resurfacing of
this street by deleting the slurry seal and constructing
an Asphalt Overlay. It is estimated that the construction
of an asphalt overlay on that portion of Tierra Rejada
Road, from a point west of Spring Road to the Arroyo Simi
bridge, will cost approximately $600,000, including
design, inspection and contract administration. The cost
of this method of resurfacing is far greater than the
application of a Slurry Seal. However, in the opinion of
staff, the benefits of this approach in terms of the
longevity of the street, ridabili.ty, appearance, etc.
justify this additional expense.
If approved, this street could be added to the Asphalt
Overlay project, which is funded by a federal Surface
Transportation Program (STP) grant, which is now in
design.
It is recommended, therefore, that the City Council
approve this change in the design for the resurfacing of
this street segment.
D. Fiscal Impact
1. Current Project: A re -cap of the present total project
cost estimate is as follows:
Amount ($)
Construction: 127,848
Contingency: 17,152
Admin & Insp: 15,000
c160,000
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RECOMMENDATION
Staff recommends that the City Council take the following
actions:
1) authorized staff to proceed with the preparation of a
design and the solicitation of bids for the construction
of a subsurface drainage system along selected portions of
Tierra Rejada Road;
2) authorize staff execute a Change Order to the contract for
the subject project to delete the application of slurry
seal and to authorize payment not to exceed $5,000 to
cover mobilization and related posts; and,
3) approve the addition of the subject segment of Tierra
Rejada Road to the 1995 A/C Overlay Project.
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