WWTP GRIT & AERATION CRITICAL IMPROVEMENTS PROJECT
ORIGINAL CONTRACT PRICE 33,773,000$
Original Engineer's Estimate for Construction - 38,800,000$
CHANGE ORDER
NUMBER DESCRIPTION AMOUNT Veolia Mark-up
Change Order 1 Bid Alternative. Return of Activated Sludge (RAS) piping modifications. 304,617$ 27,416$ Change Order 2 Bid Allowance A: Primary sedimentation basin column repair. 8,511$ 766$ Change Order 3
Force account work. Changed conditions (i.e., biofilter utility conflicts, Solids Handling Building sludge line backfeeding, Dissolved Air Flotation Thickener (DAFT) #1, PCB contaminated concrete disposal, etc.)
161,535$ 14,538$
Change Order 4 Design change: Build concrete wall in place of the removed slide gate in aeration basin (AB) 4A. 65,803$ 5,922$
Change Order 5
Design changes: Material costs only (for lead time) for three design clarifications DC 001, 002 and 005 regarding slide gates, blanking plates, duct banks, Blower Building electrical room modifications, etc.
755,385$ 67,985$
Change Order 6 Design changes: Follow up to CO 5 - Contractor labor, equipment and subcontractor costs related to design clarifications DC 001, 002 and 005. 942,770$ 84,849$ Change Order 7
Force account work: Changed conditions (i.e., Electrical panel and diesel tank vent relocation, wet weather fiber optic conflict, primary sedimentation basin lights, 3W bypass for demo in the aeration basins, electrical investigation for DC005, 54" 3W investigation, etc. ).
49,049$ 4,414$
Change Order 8 Force account work and design omission (i.e., aeration basin handrail salvage, pipe chase 4 demolition, lime treatment of native soils, new wall for slide gate, etc.) 232,804$ 20,952$ Change Order 9 Design changes: DC004 (blower building louver modifications) credit, LED luminaire changes, DC008 (3W extension in aeration basin 4) 5,313$ 478$ Change Order 10 Concrete repairs in basins 3 and 4. (Bid item 9 quantity overruns based on unit bid pricing.) (Note this includes 16.% mark-up)
143,407$ 23,662$
Change Order 11
Design changes: DC002.1 (aeration basin channel walls), DC009 (new flowmeter at Pista Grit) , RFIs 123 and 264 (new wall for slide gate and concrete slab repairs in basins 3 and 4).
314,710$ 28,324$
Change Order 12
Design changes: DC006 (scum pump station structural and mechanical modifications) and DC007 (RAS piping modifications, including fabrication and installation of moment resisting frames to reinforce the structural soundness of the channel). 684,724$ 61,625$
Change Order 13 Concrete testing, BAAQMD authority to construct (ATC) permit renewal, misc. technical services. [Note: this change order is between Veolia and the City] 49,186$ 4,427$ Change Order 14
Design change: DC010 (air piping modifications at the aeration basins, including upsizing control valves, isolation valves and associated piping resulting in better dissolved oxygen control and subsequent energy savings).
514,664$ 46,320$
Change Order 15
Force account work. Changed conditions (i.e., reclean basins after flood events, electrical vault repairs, yard piping additional demolition, scum box relocation, 3W extension and valves, etc.)
252,746$ 22,747$
Change Order 16 Design changes: Explosion proof motor in submersible pumps in the Pista Grit, rotating weir spare parts, new biofilter fan, Pista Grit slide gate modifications, grit loading area changes. 398,827$ 35,894$ Change Order 17
Force account work. Changed conditions (i.e., additional duct bank demo, lighting power reroute, pipe chase 3 demo and backfill, turning Basin 4 into an operational aeration basin, temporary bypass for mixed liquor channel work, etc. )
306,543$ 27,589$
Change Order 18
Design changes: 3W modifications in the aeration basins, new 6" drain from Influent Pump Station (IPS) to fine screens, added tread plates and support beams, changes to the AC unit ductwork, etc.
426,921$ 38,423$
Change Order 19
Design changes: safety handrails need to be furnished and installed around the upgraded aeration basisn; also concrete repairs to the basins were more extensive than originally anticipated, the extents of needed repairs was estimated at the beginning of the project.(Note - this includes 16.5% mark-up as not part of orignal scope) 1,413,813$ 233,279$
Change Order 20
Design changes and force account work: resolving a utility line conflict; additional concrete repairs to the aeration basins; finish paving at the site; compensable contract time extension; any additional punch-list items to finish the project. 3,588,862$ 322,998$
$ 10,620,191 $ 1,072,609
11,692,800$
TOTAL APPROVED CHANGE ORDERS
TOTAL APPROVED CHANGE ORDERS including Veolia's mark-up