d. Rivanna Water and Sewer Authority (RWSA) Monthly Update

ALBEMARLE COUNTY SERVICE AUTHORITY
AGENDA ITEM EXECUTIVE SUMMARY
AGENDA TITLE: Rivanna Water &
Sewer Authority (RWSA) Monthly
Update
AGENDA DATE: September 15, 2016
STAFF CONTACT(S)/PREPARER:
Gary O’Connell, Executive Director
ATTACHMENTS: None
CONSENT AGENDA: Informational
BACKGROUND: This report continues the monthly updates on the Rivanna Water &
Sewer Authority (RWSA) projects and Board meetings. Below are some updates from
the Board meeting on August 23rd, and other RWSA projects:

Drinking Water GAC (Granular Activated Carbon) Project – To meet new water
quality standards, the RWSA has Granular Activated Carbon (GAC) advanced
filtering projects underway at all the five (5) water treatment plants. In addition,
water plant improvements, upgrades, and rehabilitation are underway at the
South Fork, Crozet and Observatory Water Treatment Plants (WTPs). The
anticipated completion dates for all the water treatment plant projects is
December, 2017.
South Rivanna WTP - Construction of additional clearwell storage;
installation of a chlorine contact tank; replacement of the lime feed
system; upgrades to the filter underdrains and backwash system;
replacement of the filter media; sound attenuation and ventilation
improvements for the high service pump station; installation of a variable
frequency drive and soft start motor for pumps at the raw water pump
station; installation of new raw water and finished water flow meters, and
several improvements to the residuals management facilities. Work has
continued on the reinforced concrete placement for structure foundations.
The GAC building foundation has been started, and work continuing on
the proposed chlorine contact tank and equalization basin. Large
diameter ductile iron pipe installation between the existing filter building
and the new chlorine contact tank and GAC facility is approximately 95%
complete, including the connection to the filtered water pipe gallery. Leak
testing of the new concrete water structures is ongoing, as well as waterproofing treatments on concrete tank exteriors and backfill. Work will
begin soon on the installation of the new GAC building electrical
service line.
Observatory WTP – Construction of a new chlorine contact tank; upgrades
to chemical feed systems, and installation of a finished water flow meter.
The foundation excavation for the intermediate pump station, new GAC
building, and chlorine contact tank are complete. The reinforced concrete
foundations for the GAC building, chlorine contact tank, and intermediate
pump station are almost complete and will begin leak testing soon.
Various large diameter ductile iron pipes have been installed, as well as
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the vertical turbine pump chambers for the intermediate pump station.
The GAC contactor vessels have been delivered to the site and set in
place. Various electrical conduit and wiring have been installed at the
site. Some demolition work has begun in the existing flocculator basin,
and in the existing chemical feed room adjacent to the flocculator basins.
The equipment for the flocculator rehabilitation work has been delivered
to the site.
North Rivanna WTP – Installation of new filter control valves; new pump
control valves; new filter sludge removal equipment; new electrical system
upgrades throughout the plant; new finished water flow meter, and the
installation of a surge relief mechanism. A new finished water flow meter
and filter backwash water piping connection are complete. Erosion and
sediment control features have been installed, and the GAC building
foundation excavation is under construction. The intermediate pump
station concrete work has also been started. The new finished water pipe
connection to the existing clearwell has been completed. The new
electrical service is to be installed soon.
Crozet WTP – Upgrade of the chlorine feed system to a modern
hypochlorite feed system, install a finished water meter with
appurtenances, and replacement of the existing fluoride and corrosion
inhibitor chemical feed systems. The new chemical feed systems will be
housed in additional rooms in the future GAC contactor building. This new
location will allow for shorter chemical feed lines.
New clearwell
expansion tanks have been installed on the discharge side of the WTP
effluent pipe, and were placed into service in the last week of May. These
tanks will provide expanded clearwell capacity which will provide beneficial
operation upgrades for both the temporary and permanent scenario. The
GAC building foundation has been excavated, and the reinforced
concrete foundation is under construction. Work is continuing on the
intermediate pump station portion of the foundation. Work is continuing on
the intermediate pump station portion of the foundation.
Scottsville WTP – The relocation of the existing water pipeline will
provide room for the new GAC building foundation excavation. The GAC
building and intermediate pump station foundation excavation is mostly
complete, and the reinforced concrete foundation work has started. The
storm water sand filter excavation is complete.

Rivanna Pump Station – Work is ongoing on the Rivanna Pump Station on
RWSA property and the tunnel work is completed, with pipe installation also
complete. Reinforcing steel, conduit installation, and concrete pours for the
concrete walls of the new pump station have been completed up to ground
level. The 1,600 foot tunnel and installation of a new 60 inch sewer interceptor
pipe is complete. The building roof beams over the west pump room have been
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AGENDA ITEM EXECUTIVE SUMMARY
poured, and the concrete floor pour over the east pump room will occur in the
next month. The contractor has assembled most of the large diameter piping
inside and outside the pump station and installed the pumps. This project
continues to be several months behind schedule.

Schenk’s Branch Sewer Line – This is a 100% City funded project serving only
the City, and City customers. This project is part of the DEQ Consent Order
requiring completion. The project has been divided into two phases (1) a section
between Schenk’s Greenway (at Allied Street) to the McIntire Recycling Center
and (2) the Recycling Center to the Preston Avenue section (under negotiation
between the City and County, which has not been finalized). The Phase 1
construction contract has been awarded and work began in early July 2015.
Excavation is ongoing on the project along McIntire Road in the Schenk’s
greenway area, with some pipe and manhole installation work continuing over
the next several months. Three manholes and 798 linear feet of sewer pipe
have been installed. The project construction has been slowed with
difficulties in excavating in rock with a deep sewer installation. Once the
sewer pipe/manhole installation work is complete, the greenway will be
reconstructed with a new walking path and landscaped areas. Construction
completion of phase I is anticipated in December, 2016.

Reservoir Management Study – The project work by Dinatale Water Consulting is
well underway, and they are reviewing the background information that has been
provided. The primary goal for the study is recommendations for improved
reservoir water quality, especially dealing with the algal bloom issues that occur
seasonally. The study includes all five reservoirs used for the public water
supply: Beaver Creek, Ragged Mountain, South Fork Rivanna, Sugar Hollow and
Totier Creek. Dinatele has analyzed the water quality data being collected by
RWSA staff at each of the reservoirs and watersheds. Additional water quality
monitoring will occur to determine the feasibility of in reservoir air machines to
reduce algae growth. Final report is due in January, 2017. A public
information document is included in the packet, and also available at
www.rivanna.org/reservoir-study.

Wholesale Water Metering – This was a project required in the Water Supply
Agreement to assure accurate water use data for future City and ACSA cost
allocations. Additional easements were needed and have been granted. New
metering has been installed at three of the urban water plants with the
GAC/Water Plant Improvement Projects. The contract for $2.03 million has been
approved (under the CIP and engineer’s estimate). Construction has begun and
is expected to be completed in mid-April of 2017. Construction of the first three
meter sites is complete and a fourth is underway. The alternative non-University
site easement has been granted, and the design work has been completed.

1983 “Working Agreement” (“Working Agreement on Urban Area Wholesale Flow
Allocation and Billing Methodology”) – The existing 1983 “Working Agreement”
for water is currently used to establish monthly billings by RWSA to the ACSA
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and the City for the Urban water bill. The Wholesale Water Metering Project,
once complete, will change the approach and consequently the “Working
Agreement” will need to be amended. We are reviewing the agreement and will
be having discussions with RWSA and City staff as a next step. It is expected
that the metering project will be completed by early 2017. Timing wise the
amendment would need to be in place by the spring of 2017 in time for the FY
’18 budget submissions in March, 2017. The new billings would likely start in
July of 2018, once there is 12 months of metering data. Initial drafting work
and discussions have started occurring.

VDOT Route 29 Solutions – Route 29 Widening and Berkmar Drive Extension –
The VDOT Route 29 Widening project includes widening of Route 29 (Seminole
Trail) from a four-lane divided highway to a six-lane divided highway from Polo
Grounds Road to Town Center Drive at Hollymead Town Center. Due to the
proposed grade changes and full depth pavement replacement, VDOT has
determined that RWSA’s existing 12-inch cast iron water line along Route 29 is in
conflict and must be relocated for the entire length of the project. RWSA had
previously identified through master planning that a 24-inch water main will be
needed from the South Rivanna Water Treatment Plant to Hollymead Town
Center, in order to meet future water demands. RWSA has requested that VDOT
and its Design-Build Contractor relocate the existing 12-inch water main as a 24inch water main, and according to VDOT policy, VDOT would bear the cost of
relocation as a 12-inch line and RWSA would bear the additional cost for the
“betterment” from 12-inch to 24-inch. Additionally, as part of the utility work for
the Berkmar Drive Extension Project, RWSA has requested to include the
installation of a casing pipe under the new roadway to carry a future sewer line
from the South Rivanna Water Treatment Plant to an existing ACSA sewer line.
Design has been completed and construction is anticipated to take place from
December, 2016 to March, 2017. A work authorization for the construction
inspection services for this project is included in the Board packet.

Wastewater Flow Metering (Comprehensive Sanitary Sewer Study Update) –
Part of the 2014 Wastewater Cost Allocation Agreement was to base future
allocation of costs on actual sewer flow metering. Field sewer flow meters were
installed to measure wet weather flows. This will help take into account the
infiltration/inflow, rainwater/groundwater, and dry and wet weather flows in the
ACSA and City systems in the allocation of costs. Wastewater flow data was
collected for six months which included sufficient wet weather information for
modeling purposes and updates, as part of the process to determine flow
projections throughout the collection system. The analysis comparing wet and
dry weather flows has been completed. Population projections, which are part of
the model, were updated. A final report was submitted in late July. The
ACSA capital projects recommended include the recently approved
Glenmore SSES; upon completion of construction of the Rivanna Pump
Station, an SSES study for Pantops; and a FEB (flow equalization basin) for
Crozet, which is a separate CIP project for RWSA.
ALBEMARLE COUNTY SERVICE AUTHORITY
AGENDA ITEM EXECUTIVE SUMMARY

Moore’s Creek AWRRF (Advanced Water Resource Recovery Facility-new
name) Odor Control – Recommendations for odor control improvements that
would significantly control odors from traveling beyond the Moore’s Creek
AWRRF fence line were presented to the RWSA Board of Directors (BOD) in
December, 2014 and a CIP project for $9.33 million was approved at the
January, 2015 BOD meeting. The design for odor control improvements includes
covering the head works and screening channels, installing grit facilities,
constructing a bypass line through on equalization basin, covering the primary
clarifiers, building additional odor scrubbing facilities to treat the foul air from the
covered sources and the New Rivanna Pump Station, removing the postdigestion clarifiers from service, modifying the handling, hauling and storage of
biosolids on-site, cleaning the equalization basins and holding ponds, and
coating the interior of the digesters. All bonds and permits obtained with
preliminary site work and layout beginning.

South Rivanna Hydropower Plant Rehabilitation – RWSA constructed a
hydropower plant at the South Fork Rivanna Dam in 1987. Power generation at
the plant was limited for a number of years due to various mechanical issues and
has been completely offline for the past two years. The first step towards
rehabilitation of the hydropower facility was to perform a feasibility study where
previous recommendations and interaction with the Federal Energy Regulatory
Commission (FERC) are taken into account to determine whether it will be cost
effective for RWSA to rehabilitate the facility. An inspection of the plant’s
mechanical equipment has occurred. A project status report is included in the
Board packet. Feasibility is still being evaluated.

South Fork Reservoir to Ragged Mountain Pipeline – The adopted RWSA CIP
Budget has $2,295,000 budgeted to the right-of-way and feasibility phase, with
funding beginning in July, 2017 (FY 2018). The future construction of a new
pipeline is part of the 50-year Community Water Supply Plan to increase the
future transfer capacity through replacement of the Sugar Hollow Pipeline along
an alternative alignment to be determined. The pipeline project will involve a
more detailed routing study to determine the most feasible alignment to
begin in July, 2017.

Crozet Water Plant Capacity Study – As Crozet continues to grow, RWSA
monitors the water treatment plant sizing to meet water demand (use) on the
maximum day (24 hour period) of each calendar year. RWSA will be conducting
a preliminary engineering evaluation of a future water plant expansion at Crozet,
as part of the FY 2017 CIP. Current trending is indicating that the maximum day
demand could reach the current capacity (1 MGD) of the Crozet Water Treatment
Plant as soon as 2021. An engineering firm was approved to conduct this
engineering study which is underway.

Crozet – Finished Water Pump Station – As part of the current FY 2016 CIP, the
Crozet Water Treatment Plant is being studied to expand the treatment capacity
to secure future demand needs of the Crozet community. Prior to any plant
ALBEMARLE COUNTY SERVICE AUTHORITY
AGENDA ITEM EXECUTIVE SUMMARY
expansion, it has been determined that the finished water pumping facilities are
in dire need of replacement. The Finished Water Pump Station (FWPS) is a new
design project to fully replace the antiquated existing pump station, and will be
constructed ahead of any plant upgrades. The existing pump station is very
small and was constructed as part of the original plant construction in the late
1960s. The pumping equipment and controls are out dated, and operational
reliability and efficiency have been drastically impaired. Operational reliability is
limited, and the pump house has inadequate heating and cooling. The pump
house is located in a low, poorly drained area near the ground storage clearwell,
and drainage issues exist.
Due to the age and condition of pumps, electrical systems, building systems, and
controls, it has been determined that a full station replacement is necessary. The
new pump station building will be of similar construction as what is being built for
the GAC facility at Crozet WTP.

Crozet Ground Storage, Crozet Waterball and Stillhouse Tank Improvements –
Following inspections of these water tanks, work needed was repairs, painting,
and structural improvements. Also, an installation of a water tank mixing system
is planned for the Crozet Ground Storage Tank. Improvements to the Crozet
Waterball are complete. Work on the Crozet Ground Storage Tank is complete.
Stillhouse Tank repairs have begun. The Stillhouse Tank will remain offline
for several months with estimated completion of early November.

Observatory Water Treatment Plant – The Observatory Water Plant was built in
1949, with some rehabilitation work done in 1988. There are several water
treatment plant projects at Observatory scheduled in the 2015-19 Capital
Improvements Plan (CIP). The most immediate project is to replace the existing
flocculator equipment and repair basin inlet troughs, replace valves, install a new
baffle wall and SCADA control equipment. The flocculator work has begun.
Further work is phased over the five year CIP.

Rivanna Water and Sewer Authority Strategic Plan – The Board of Directors has
requested that a Strategic Plan be developed for the Rivanna Water and Sewer
Authority (RWSA).
Project is on hold awaiting appointment of new
Executive Director.

Executive Director Search – The Titan Group has been contracted to assist in the
recruitment of a new Executive Director. The process is estimated to take three
(3) months. Interviews with final candidates are scheduled for September
22nd. In addition to the RWSA Board interviews, a Community Panel will
also be interviewing which included ACSA Board member Jennifer
Sulzberger; the Community Panel also includes a representative from U.Va,
an environmental organization, business/Chamber, and Rivanna River
Alliance.
ALBEMARLE COUNTY SERVICE AUTHORITY
AGENDA ITEM EXECUTIVE SUMMARY

Moore’s Creek AWRRF (Advanced Water Resource Recovery Facility –
Wastewater Treatment) Roof Replacements – Major maintenance work to
replace aging roofs (35 years plus in age). Project was approved in the CIP
(Capital Improvement Program).

Bond Refinancing – A series of RWSA bonds were refinanced, lowering the
interest rate and reducing the annual debt service costs by $120,000 a year.

Crozet Flow Equalization Basin (FEB) – Rehabilitation work in the RWSA and
Albemarle County Service Authority (ACSA) sewer systems is on-going to
meet inflow and infiltration (I&I) reduction goals in the Crozet Interceptor
sewer basin based on the flow metering and modeling results of the
Comprehensive Sanitary Sewer Model and Study conducted in 2006. The
intent was to reduce I&I in the system to meet the 2020 two-year storm flow
targets.
An update to the 2006 model was completed which evaluated the I&I
reduction goals previously established and future capital project needs.
Based on the results of that study, it was determined that the Crozet
Interceptor system and namely the existing Crozet Pump Stations (1
through 4) have adequate capacity to handle the 2015 peak wet weather
flow from the Crozet service area during a two-year storm. However, as
projected growth in the service area occurs, peak wet weather flows in the
area under the storm conditions established in the updated model will
begin to exceed the firm capacities of the pump stations by 2025.
Additional I&I reductions, in order to reduce flows enough to not exceed
the pump station firm capacities, are not feasible and as a result the
construction of a flow equalization basin was identified as the best method
to alleviate wet weather capacity issues.
While the study indicates that capacity should not be an issue until 2025, a
flow equalization basin (FEB) would also provide a significant benefit to the
maintenance of the Crozet Pumping Station system which currently lacks
system storage necessary to allow adequate time to perform repairs on the
pumps and the associated force mains while the system is down. As a
result, it is important to progress into the siting study for the flow
equalization basin to ensure that it can be constructed in time for the 2025
flow targets, but also to facilitate less complicated and more thorough
maintenance on the system that has not been possible previously.
RWSA is finalizing a Work Authorization with Greeley and Hansen (G&H) to
perform a siting study for the flow equalization basin project. These
services will include the sizing of the flow equalization basin and the
pumping station based on information from the updated model, a
preliminary site selection process based on the sizing requirements
ALBEMARLE COUNTY SERVICE AUTHORITY
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identified, and an alternatives analysis performed for each selected site to
evaluate the feasibility of locating the facility.
Attachments
010101RWSAUpdateExecSumm083116