San Mateo City Council
November 6, 2023

Att 1 - Dale Ave Pump Station Improvements - Anvil Builders - Contract Change Order Summary (as of 10/27/2023) CCO # Execution
Date Price Details of Change
1 6/25/2020 34,336.13$ Provide two new surge tanks for operation under full vacuum conditions 2 11/12/2020 143,160.81$ Add lifting handles to metal plates; elevator cost split; 36" pipe connections to wetwells; and RCP force main coupling
3 2/8/2021 413,991.93$ Force main and influent junction box shutdowns and plug installations; and force main dewatering 4 4/7/2021 39,973.38$ 4 month power fluctuation monitoring to determine if there are impacts to pump operations 5 7/20/2021 429,433.45$
SCADA hardware modifications; Force main #1 groundwater and pipe liquid mitigation; Force Main #2 joint pressure test; Force Main liner access pit relocations; Elevator cab modifications; switchboard surge protection device; grit cleanup; sump pump relocation; slide gate plate; force main wall penetration; and wet well crack repair
6 10/25/2021 225,359.53$ HVAC monitoring panel, horn, strobe, pressure switches, and control wires 7 4/19/2022 37,369.00$ PLC upgrades, programming, and control wiring modifications to correct pump stop logic 8 4/19/2022 228,176.24$ Sump pump conduit wiring; HVAC redesign; and force main 1 pipe conflicts 9 5/4/2022 95,251.54$ Fiber connection change; surge tank demo of underground vault for pile construction; wet well crack repair; street light repair; sump pump guide rails; antenna transmission capabilities; and infill plates 10 7/11/2022 162,843.78$ Temporary generator through June 2022 due to Air District Permit issue with permanent generator 11 9/26/2022 188,747.97$
Work hour waiver; antenna pole; temporary generator; smith blair grout packing; pipe lining delay charges; fan reconfiguration; force main penetration leaks; electrical changes; and SCADA antenna conduit
12 11/13/2022 202,693.78$
Reroute MCC wires; flowmeter install; exhaust beam supports; temporary generator extension; additional structural calculations for elevator; emergency feeder conduit/roof drain; UPS power monitoring; gas monitoring system repair; jacket water heaters; stairway light switches; generator silencer; rotating valves bonnets; and elevator abandonment 13 11/13/2022 1,115,403.92$ Tier 4 generator procurement, shipping, assembly, emmission abatement equipment, wiring, controls, and submittals
14 7/30/2023 46,209.60$
MAS Devicenet modifications; cover elevator openings; weather tower radio conduit removal; elevator pit leak repair; old gas sensor replacement; air compressor repair service; temporary generator swap; elevator equipment removal and de-scoping; and air compressor block heater install
15 10/23/2023 55,159.58$ Generator parapet enclosure; and pump drain bleed valve install 16 10/23/2023 39,734.00$ Elevator electrical changes TOTAL 3,457,844.64$