HomeMy WebLinkAbout0381.093July e. 1993
THE HONORABLE CITY COUNCIL
Palo Alte, California
Everett. Avepne/Hawthorne Avenue Storm D::::ai~l Improvement Project
CIP 47702 -Increase in Contingent Authority for Proie __ £t.....bl..oseout
MemPers: of the Cou..."'1cil;
Report. in Brief
This report recommends that Council al.lthorize the City Manager or
her designee to negotiate and execute one or more additional change
orde:rs to Contract no. C3032.994 t;l'ith D. W. Young Construction
Company. Inc'r in an amount not to exceed $15,000. This represents
ax .. increase in staff's change order authority from $290~OOO to
$305,000 fo,r-all change orders through project .;;loseout. Funds are
available in elP 47702~ Collection System Improvements at no
incre~~e in prcject budget.
Background
On August ~O. 1932, Council approved a construction contract with
D. w. Young Construction, Inc. for $1,469,407.75~ plu? $290,000 in
change order authority, for the Everett Avenue!Hawtho.t·ne Avenue
Storm Drain Improvement Project (CMR:374:32). It should be
specifically noted that the contract award amount was 29 percent
below the engineer's estimate of ~2,C~9,435 for the work.
The sc~pe of the project includes the construction of approximately
680D feet. of storm drain (:r·anging fr<?m 12 incbes to 54 inches in
diameter) from the intersect jon of Univ~.csity Avenue/F.arw.:ma Street
to an outfall into Sa~ Francisquito Creek at the end of Everett
Avenue. The work also includes constructicn of manholes, catch
basins, curb and gutter, curb ramps foz the disabled. and pavement
restoration.
During the course of construction, some of the contract quantities
increased signifir:antly and seve.t·al unforeseen items of work were
added to the contract. These chang~s have resulted in a measurably
improved final product benefitting the City. Examples of these
changes include:
• Increase in pavement restoration quantity due to the failure
of existing pavement adjacent to the trench. Many of the
streets, particularly those cons~ru.cted with concrete, had
existing crack.s and defects ';oI'hich caused the pavement to break
CMR:381:S3
--.... ~~----'-
,
1
7
•
up once i~ was t~enched.
replaced.
/-
The failea. pavement was re~oved and
Increase in number of curb ramps due to a revised
interpretation of the Americans with Disabilities Act (ADA).
Curb raTr.ps were installed at all fO'..lr corners of an
intersection even when only one corner was modified for the
installatic;n of a catch basin.
~ Reconstruction cf the full oavement structural section rather
than grinding and asphalt o~erlay at ten intersections. Since
the eXisting pavement was in a condition worse than expected
and was further weakened by the extensive trenching, it was
necessary to remove and reconstruct the pavement in order to
maintain the structural integrity of the str€.et.
• Modification of stcrrr. drain installation to a.ccommodate
unanticipated conflicts with exLe-ting '..ltilitier.;. Storm drai:1
pipeline~ manholes, and catch basins were required to be
ralocated in order to avoid interference with utilities that
were unknown or at differ~nt locations than expected.
Six change orders totalling $279.755 have been issued to the
contractor to date for changes in the work. The original change
order authority has been reduced to approxima.tely $10,000.
Within the final block of construction~ on Ramona Street between
university Avenue and Lytton Avenue, the contractor encountered two
u..,expected site conditions. This resulted in 3. contractor's
request for compensation for increased construction costs even
though the scope of work did not increase. First of all, there was
an unexpected change in subsurface soil conditions. Throughout the
earlier stages of cO.1struction, the soil was consistently firm and
stable as describp.d by the soils report. prepared during the design
of the project. For a distance of s"3ve:r-al hundred feet on Ramona
Street, however, the soil was of a loose sandy nature and
susceptible to caving+ In order to maintain the structural
integrity of the trench. the contractor had to increase the shoring
of the trench walls and change the pipeljne installation technique.
This resulted in slower production rates. Secondly. the contractor
discovered tL~der9round telephone cables which had not been
identified by Pacific Bell during proje~t design and which
conflicted directly with the proposed storm dr3~n alignment. In
orde't" to avoid the telephone lines, the .storm drain had ':0 be
rerouted and several manholes had to be a~ed to Lhe line at an
additional cost.
The contractor has re~~ested a change order to cover the cost of
the additional labor and materials charges and time delays caused
by these unforeseen conditions. Staff has evaluated the
contractor'S request and believes that approximately $25,000 of the
requested costs are justified. The alternative would be to deny
the contractor's request for additi0nal compensation and await the
contractor's initiation of legal action against the City.
-2-
, .. ::~~>~~
Therefore, staff recomT'lIends that the: authority to issue change
orders be increased by $15,000 to cover the cost of these items.
Funds for this increase are budgeted in CIP 47702 from the balar.ce
available due to the favorable bid for the project,
Re comme ndat ion
Staff recommends that Council authorize the City Manager or her
designee to negotiate and execute one or more adcitioIial change
orders to Contract No. C3032994 with D,W. Young Construction
Compc:ny, rnc., in an amount not to exceed $15,000. This represents
an in,~rease in staff's authority from $290,000 to $305,{JOO for all
change orde rs .
Respectfully subrnitted~
Gs.:ORGE BAGDON
Assistant Director of ~lblic Works
Related Report: CMR:374: 92
C'MR.:3Bl:93 -3-