Post on 02-Jan-2016
description
Water System Planning Study
December 3, 2009
Agenda
• Purpose and Need
• Scope of Work
• Raw Water System
• Existing WTP
• Regulatory Issues
• Site Selection
• Proposed WTP
• Finished Water Transmission
• Proposed Improvements
• Costs
• Next Steps / Schedule
Purpose and Need
• WTP near capacity (currently 75%; KDOW sanctions at 85%)
• Aging water infrastructure
• Increasing demand
• Regulatory changes
Purpose and Need (cont.)
• Reliable supply needed
• Bluegrass Water Supply Commission
• Other alternatives studied
• City decided to build new WTP 5/08
• Keep existing WTP in service
Scope of Work
• Evaluate existing systems and future needs
• Assess new and future regulatory changes
• Identify best site for WTP
• Recommend necessary system improvements
Raw Water Sources
• Kentucky River intake OK
• Maximum permitted withdrawal OK
• Changes in next permit (no step down)
• Concerns – Dam #10 condition, spills
Raw Water Sources
• Reservoir as backup supply
• Significant current leaks
• Siltation – lower intake clogged
• Aesthetic water quality issues 9 months of the year
Raw Water Pump Station
• 2 existing pumps – 5.5 mgd firm capacity
• Originally designed for 4 pumps – 15 mgd firm capacity
• Recommend 1 new pump for 2 operating with 1 standby – could deliver 14+ mgd to new WTP
Raw Water Transmission Main
• Existing 18” line over 50 years old
• Limited existing capacity
• New 30” needed to new site (lifespan 50+ years)
• Existing 18” to continue serving existing WTP and reservoir
!H
!H
3Q
!H
BOO
NES
BOR
O
WATE
RW
OR
KS
FOR
D
NIC
K
FO
RD
-HA
MP
TO
N
ELKIN STATION
LETTIE
BRIDGEVIEW
PR
OV
IDE
NC
E
BUSHWOOD
QU
ISE
NB
ER
RY
OLD
BO
ON
ESBO
RO
OLD STONE CHURCH
STONECREST
RE
SE
RV
OIR
Existing Water Treatment Plant
• Initially constructed 1891
• Last major upgrade 1974
• Currently rated at 5.3 mgd
• Reliable, sustainable 3.2 mgd
Existing Water Treatment Plant
Need interim improvements:
• Replace filter media
• Sludge removal equipment
• Potential expansion not feasible on current site, based on 1999 studies