Rialto Digester 1 Activation
FINAL CONSTRUCTION WORK AUTHORIZATION
RIALTO ANAEROBIC DIGESTER 1 ACTIVATION
Project
This project includes the work required to make Digester 1 fully operational and transfer sludge from Digester 2 to Digester 1 to make Digester 1 fully operational and stabilize the Digester 1 operation.
Scope of Work
Scope of work includes the work required to test sludge holding tank pipe and valve and install Tee connection with valve for emergency dewatering purposes, install the 3-way valve & flowmeter (already purchased) in the Digester sludge feed line; equipment to pump the water out of Digester 1, clean and filter the sludge in Digester 2 prior to seeding Digester 1 and pump this seed sludge into Digester 1 to bring it into operation.
Cost Estimate
See Attachment 1. Requested Amount = $1,563,953
Schedule
See Attachment 2
Work Plan
See Attachment 3
Approved By Rialto City Council/Rialto Utility Authority:
____________, Tab Item No. _____
Issued by:
Rialto Digester 1 Activation
Rialto Utility Authority
By: ______________________
Name: Thomas J. Crowley, P.E.,
Title: Utilities Manager
Date: _____________________
Received by:
Rialto Water Services, LLC
By: ______________________
Name: ___________________
Title: ____________________
Date: _____________________
Rialto Digester 1 Activation
ATTACHMENT 1 – Cost Sheet
Rialto Digester 1 Activation
Rialto Digester 1 Activation
ATTACHMENT 2 – Project Schedule
Rialto Digester 1 Activation
Rialto Digester 1 Activation
ATTACHMENT 3 – Work Plan
Rialto Digester 1 Activation
Detailed Workplan for Activating Digester No. 1 and taking Digester No. 2 offline for Rehabilitation
Step # Activity Duration Resources
1a Veolia will direct DN Tanks to
perform the detailed structural
inspection for the Sludge
Holding tank and submit a
detailed inspection report
outlining the structural repairs
needed to bring the Sludge
holding tank into service
3 weeks Veolia Technical & Performance
team, CPM team and
Operations teams will work with
DN Tank to coordinate site visit,
review the report, and provide
feedback
1b Upon completion of inspection
report and discussions with
RWS and the City, Veolia will
direct DN Tanks to perform
necessary repairs to the Sludge
Holding Tank
17 weeks Veolia Technical & Performance
team, CPM team and
Operations teams will work with
DN Tank to review inspection
report and oversee remediation
work
1c Veolia will direct DN Tanks to
provide and install Aluminum
dome cover and gas piping
connection for Sludge Holding
Tank as required by AQMD to
make the tank ready for sludge
storage
4 weeks
2 Test Digester #1 to Sludge
Holding Tank pipe and valve
and install Tee connection with
valve for emergency dewatering
purposes
1 week Veolia Operations will work with
Track Tech to excavate the
existing underground sludge line
for Digester #1, and install Tee
connection with valve for
emergency dewatering purposes
3a Rent Baker tanks, bypass
pumping etc. for isolating and
emptying sludge line
1 week Veolia CPM team will work with
Rain4Rent, Track Tech, Big Sky
Electric and Prime Systems to
complete installation and
integration of 3-way valve and
flowmeter in the sludge line
Rialto Digester 1 Activation
3b Install 3-way valve in the sludge
line to Digesters
1 week
3c Install Flowmeter in the sludge
line to the Digesters
1 week
3d Check and adjust calibration of
flowmeter and 3-way valve;
connect power and signal to 3-
way valve
1 week
3e Connect 3-way valve and
flowmeter in SCADA system
1 week
4a Rent and set up pumps to pump
water from Digester 1 to
headworks and from Digester 2
to Digester 1 through the
screening equipment
1 week
4b Nitrogen gas to purge the line
prior to transfer of ADG and
sludge from Digester 1 to
Digester 2
3 weeks
4c Rent and set up of pumps to
pump water from Digester 1 to
headworks and from Digester 2
to Digester 1 through the
screening equipment
3 weeks
4d Rent sludge screening and
cleaning equipment, pumps,
and tank for cleaning the
Digester 2 sludge prior to
seeding Digester 1
3 weeks
4e Rental equipment and labor for
removing existing Dystor cover
from Digester #2
1 week
Rialto Digester 1 Activation
4f Technical assistance during
startup of Digester 1
2 weeks
4g Flame arrestor and piping to
convey residual ADG to flare
NA
4h Miscellaneous parts (hoses,
pumps, etc. as needed)
NA
5 Clean Digester 2 2 weeks Veolia CPM will work with Track Tech to clean up Digester 2 and
coordinate with Operations for
using Vactor trucks for removal
of sludge from the Digester