RWQCP Phase 1 Plant Expansion Overview

Construction Cost: $192,202,921
Status: Under Construction
Start Date: September 10, 2012
End Date: December 11, 2015
Contacts: Brendan Rafferty
  Administrative Analyst

MBR Primary Clarifiers (Area 102) – Mass excavation progress

EQ Basins (Area 103) – Mass excavation progress

EQ Basins (Area 103) – Equalization Basin boulder splitting

MBR Aeration Basin 5 (Area 105) – Subgrade preparation

ATT Secondary Clarifiers (Area 203) – Center Section Rebar & Forms

Digesters 3 & 4 (Area 302) – Digester 4 slab placement

Aerial of RWQCP Expansion Progress

  • bid 6782 during construction photo
  • bid 6884 during construction photo
  • bid 6884 during construction photo
  • bid 6884 during construction photo
  • bid 6884 during construction photo
  • bid 6884 during construction photo
  • bid 6884 during construction photo

Project Status

Last updated on 07/08/2013.

  • Construction of a contractor employee parking lot at the corner of Jurupa Avenue and Acorn Street;
  • Installation of security guard shack at the entrance to the plant entrance;
  • Rerouting of various underground utilities that conflict with new construction;
  • Installation of dewatering wells necessary to lower the water table sufficiently to construct the various elements such as the flow equalization basin and aeration tanks that are partially below the water table;
  • Excavation for the 10 million gallon flow equalization basin is approximately 40% percent complete;
  • Completion of a 250' x 140' x 22' deep excavation for new Digesters 3 and 4 and construction of the digester floors;
  • Completion of a 100' x 100' x 3' deep excavation for fine screen facility which removes fine solids prior to the flow entering the Membrane Bioreactor Reactor (MBR) facility;
  • Construction of two junction boxes for the primary sewer bypass piping;
  • Begin rehabilitation of activated secondary clarifiers 1, 3, and 4;

Project Description

MBR Treatment Train:

  • New 10 million gallon primary effluent equalization basin including new primary effluent pump station;
  • Four (4) new covered primary tanks, primary sludge and scum pump station, and associated appurtenances;
  • Demolition of existing Plant 1 primary clarifiers;
  • New aeration basin and modifications of existing aeration systems including new process air blower, ducts and vavles;
  • Four (4) new rotary fine screens and associated appurtenances;
  • Modifications of existing secondary clarifiers to retrofit 26 million gallons per day membrane bioreactor system, including canopy cover, scour air system, recovery clean system, chemical storage and dosing facilities and associated appurtenances;
  • Expansion of existing Chlorine Contact Basin No. 2;

Activated Treatment Train:

  • Flat cover system for four (4) existing primary clarifiers and associated ductwork to new odor control system;
  • Replacement of four (4) primary clarifier and four (4) secondary clarifier mechanisms and associated appurtenances;

Odor Control:

  • New biofilter to serve all primary clarifiers including connecting ductwork, dampers and fans;
  • New biofilter to serve the Headworks;
  • Demolition of existing Headworks biofilter;

Solids Handling:

  • Two (2) new anaerobic digesters and a new digester building;
  • Refurbishment of two existing digesters and the associated digester building;
  • Refurbishment of the existing digested sludge storage tank including Refurbishment of the existing Sludge Pumping Station;
  • New WAS disintegration system;
  • New solids blending tanks, pumps and appurtenances;
  • New fat, oil and grease (FOG) receiving and rendering station;
  • New Digester Gas Storage Facility and new Digester Gas Flare;
  • Demolition of existing Digester No. 3;

Other Works:

  • Six (6) new diesel generators for standby electrical power;
  • Conversion of existing secondary effluent equalization basins into storm water basins and associated pump stations and other appurtenances;
  • New ferric chloride storage and dosing facilities at the existing Headworks;
  • Modification and expansion of existing Maintenance Scheduling and Collection Administration Building;
  • Construction of two (2) new Material Storage Beds;
  • Miscellaneous electrical, communication, yard piping, landscaping, grading, and paving;

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General Information
Riverside Water Quality Control Plant (RWQCP)
5950 Acorn Street
Riverside, CA 92504

Phone: (951) 826-5311
The 311 Call Center is open during normal business hours to assist you.

After Hours Phone: (951) 351-6140
In case of an emergency or sanitary sewer overflow, please contact the RWQCP after hours number for immediate assistance.

Admin Hours:
Hours: M-F 7:30 am-4:30 pm  
Closed on Weekends and Major Holidays
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