HomeMy WebLinkAbout1999-217 Memo - Carollo EngineersMemorandum
From:
Date:
Re:
Honorable Mayor and City Council Members
Paula Brown/0,~.
November 20, 1999
WWTP ON-SITE PROJECT UPDATE - CAROLLO PROGRESS
REPORTS NO. 10 & 11 AUGUST AND SEPTEMBER 1999
Attached are copies of the last two-month's progress reports from Carollo Engineers
encompassing August and September's construction activity of the On-Site Process
Improvements.
To date we have had 16 change orders, including one for a complete rebuild of the Ashland
Creek Pump Station. The pump station change order alone was $I,136,000. The most recent
changes are due to delays on the off-site contract and interim measures for sludge processing.
Original Contract Amount
Change Orders to Date (detail on next page)
(note - without the Ashland Creek Pump Station
changes total $761,675 or 6.16%)
Total Approved Contract to Date
$12,374,000.00
1,897,675.00
$14,253,675.00
15.34%
Work on the pump station is complete and the old pump station should be demolished in
December. The on-site work is proceeding well, however because of the off-site delays, there
has been a need to revise operations of the sludge processing, which has delayed the start up of
the oxidation ditches. Slayden Construction is still maintaining the majority of the elements in
their schedule. Slayden expects to test the oxidation ditch this coming January with raw
sewage, and be operable late this winter. Staff will receive initial training on the new process
in December. The majority of the big concrete work is completed. Slayden is concentrating
on electrical and site piping portions.
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Change Order Summary
I Minor changes; add grinder pump temp headworks
2 Relocate the trunk line around the RAS/WAS
3 Over-excavation and rock backfill RAS/WAS
4 Miscellaneous improvements to the u/v building
5 Misc changes including additional RAS/WAS fill
6 Electrical changes to 12KV duct bank plus misc
7 Yard Hydrants, UV Electrical changes; credits
for chlorine monorail relocation and
sodium hypochlorite containment drains
8 Influent Junction Box (new requirement);
revise monoraii size - RAS/WAS pump station
9 Rock Excavation (change in site conditions);
gyp-board in UV Building
10 V-Notch Weirs For C larifiers And Misc Changes
11 Painting For Secondary Clarifiers; Misc Piping
And Freight Charges
12 New Raw Sewage Force Main
13 New Ashland Creek Pump Station
14 Interim Sludge Facilities; Lime Silo & Scrubber
15 Effluent Pipeline, Pressure Relief Valve, etc
16 Rock Excavation - Mixed Liquir Pipeline
TOTAL CHANGES TO DATE
$23,527.00
$47,500.00
$33,744.00
$14,997.00
$11,170.00
$19,868.00
$ 7,114.00
$41,978.00
$48,920.00
$30,858.00
$40,445.00
$79,128.00
$I,136,000.00
$248,285.00
$21,773.00
$74,368.00
$1,897,675.00
prior memo
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