HomeMy WebLinkAboutPackets - Council Packets (1321) AGENDA
ORO VALLEY TOWN COUNCIL
SPECIAL STUDY SESSION
JANUARY 18, 2002
TWIN PEAKS PUMPING STATION
10900 W. TWIN PEAKS ROAD
MARANA, ARIZONA
STUDY SESSION - AT OR AFTER 9:30 AM
CALL TO ORDER
ROLL CALL
1. SITE TOUR OF THE CAP CANAL TWIN PEAKS PUMPING STATION
LOCATED AT 10900 W. TWIN PEAKS ROAD. (The Town Council will meet at
Town Hall located at 11,000 N. La Canada Drive at 8:45 a.m. to drive to the Twin
Peaks Pumping Station.)
ADJOURNMENT
The Town of Oro Valley complies with the Americans with Disabilities Act (ADA).
If any person with a disability needs any type of accommodation, please notify
the Oro Valley Town Clerk, at 229-4700.
POSTED: 01/15/02
4:30 p.m.
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DIRECTIONS TO TWIN PEAKS PUMPING PLANT
10900 W. Twin Peaks Road
Tucson 85743
From Tucson
From the Freeway, west on Cortaro Farms Road to Silverbell Road(about 1 mile)
North on Silverbell (about 3 miles) then west on Twin Peaks Road(over the pass).
Past the conveyor belt (about 1.8 miles) to Twin Peaks (another 1.7 miles) can be seen on the
right (north) side of the road. Just past the pumping plant turn right into the CAWCD office
complex, take right road down into the plant. If you reach Sandario Road, you've gone too far.
From Phoenix
South(left) on I-17 to I-10
East on I-10 to Exit 242A, Avra Valley Road
Proceed West on Avra Valley Road for 5 miles to intersection of Avra Valley Road and Sandario
Road.
Turn South(left) onto Sandario Road and proceed 2 miles to the intersection of Sandario Road
and Twin Peaks Road.
Turn East(left) onto Twin Peaks Road and proceed 1 mile to the entrance road of Twin Peaks
Pumping Plant.
Contacts:
Eric Holler 520-670-4825
Bruce Garrett 520-721-7281
cell 520-403-7102
Bob Bradford 623-869-2618 (at Twin Peaks PP)
Greg Hahn 520-616-0224
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CT SSF MF/UF CT-RO SSF-RO MF/UF-RO
Water Treatment & Distribution
System Total Cost
CT SSF MF/UF CT-R01 SSF- MF/UF-
R01 R01
$ per 1.76 to 1.31 to 1.76 to 2.25 to 1.93 to 2.20 to
1,000 2.04 1.60 2.04 3.08 2.75 3.02
gallons
$ per acre- 572 to 427 to 572 to 733 to 629 to 717 to
foot 666 521 666 1,004 896 984
' includes the range of disposal alternatives delineated in appendix E.
SLOWSAND FILTRATION WITH REVERSE OSMOSIS PILOT STUDY
The Southern Arizona Regional Water Management Study(SARWMS) final report
(August 2000) provided information on the cost of several prospective water treatment
methods. Slowsand(SSF) treatment turned out to have the lowest cost- less than
one-fourth the cost of conventional treatment. Because information on the effectiveness
of conventional treatment, microfiltration and ultrafiltration is available from other tests,
the pilot test in this Study focuses on the effectiveness of slowsand filtration. The pilot
test will address the effectiveness with respect to the following questions:
1. How effective is slowsand filtration as a pretreatment to RO? Specifically,
does a slowsand system provide adequate removal of particulates that foul RO
membranes and reduce RO productivity?
2. Because TOC levels affect levels of disinfection byproducts produced during
chlorination or chloramination and because TOC levels may affect biological
fouling of RO membranes, what is the TOC removal of slowsand filtration?
The SARWMS Report recommended pilot testing on Colorado River water (CAP water)
to verify that the cost evaluation was accurate.
ow The SARWMS SSF pilot provides an independent (and unbiased) evaluation
using the detailed analysis found in the August 2000 final report, Appendix E.
Ba' For the SARWMS SSF Pilot, we completed extensive quality control measures
in specifying and placing the sand in the filter.
gar The SARWMS SSF Pilot continues the successful participation by SARWMS
members in seeking Regional approaches for water resource planning by focusing
on one of several unanswered issues.
vs' The SSF Pilot allows the water providers to develop on staff expertise in the
assembly and operation of technically advanced water treatment systems.
ow' By participating in this effort, the SARWMS partners have effectively been
able to leverage up to $340,000 of Federal dollars provided by the Bureau of
Reclamation.
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Slowsand filter design/Pilot Comparison
(see SARWMS, Table E-2)
Design criteria Full scale Pilot
Period of operation 24 hours/day 24 hours/day
Product flow 40.14 MGD 22 gal/minute or
31,680 gallons/day
Hydraulic loading rate 0.112 gpm/ft2 0.112 gpm/ft2
Total filter area 330,450 ft2 or 200 ft2
7.6 acres (16-foot diameter)
Number of filters 1 with 4 cells at one
13.38 MGD each
Initial height of filter sand bed 3.0 ft 3.0 ft
Minimum height of filter sand bed 1.5 ft 1.5 ft
Sand effective size, d10 0.27 to 0.33 mm 0.27 to 0.31 mm
Sand uniformity coefficient, d60/d101 Less than 2.5 0.67
Height of underdrains, including 1.5 ft 1.5 ft
gravel layer
Height of supernatant water 5 ft 4.5 ft
Freeboard 2ft 0.5ft
Total filter basin depth 9.45ft 10ft
1 The ratio of the sieve size through which 60 percent of the sand will pass to the size through which 10
percent will pass.
Economic Ba ne t
� so
Using
� Savings frompurchasing, install'i
ng, &
operating bottled water or home
water filtrationst
sy ems
® Savings 'ofwater lost with softeners & RO units
® Savings by providing lowNsalinitywater
to ALLPP
household appliances
(fewer repair & replacement costs)
4* Uses less idetergentsoaps and other
® . Car radiator life is extended
City of MWD of
Item Tucson S . California
ReducingGalvanized 0.7 6 1 .1 7
pipes
salinity W ater heaters 0.8 1 0 .9 1
Garbage 0 .02 0 .19
from disposals
C lothes 0.1 4 0 .84
700 m /�1 washers
,x/1Evaporative 0.1 8 -
to 200 m coolers
C a r radiators 3 .3 6 -
Toilet 0.01 -
m echanism s
D ishw ashers 0.23 0 .68
Faucets 0.2 8 0 .5 7
Pool 0.1 9 -
equip m ent
Clothes 0 .38
S �m l thperpzn'� re laceent
,� Detergents 0 .3 6 0 .1 3
i !e-fuu L a w n w ate ring 0.0 8
residence Bottled water 3 .4 6 -
H om e filtration 3 .98 0 .08
o t Bottled
w ater
W ater - 1 .4 0
softeners
Total 14.24 5 .98
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R01 R01
$ per 1.76 to 1.31 to 1.76 to 2.25 to 1.93 to 2.20 to
1,000 2.04 1.60 2.04 3.08 2.75 3.02
gallons
$ per acre- 572 to 427 to 572 to 733 to 629 to 717 to
foot 666 521 666 1,004 896 984
1 Includes the range of disposal alternatives delineated in appendix E.
SLOWSAND FILTRATION WITH REVERSE OSMOSIS PILOT STUDY
The Southern Arizona Regional Water Management Study(SARWMS) final report
(August 2000) provided information on the cost of several prospective water treatment
methods. Slowsand(S SF) treatment turned out to have the lowest cost- less than
one-fourth the cost of conventional treatment. Because information on the effectiveness
of conventional treatment, microfiltration and ultrafiltration is available from other tests,
the pilot test in this Study focuses on the effectiveness of slowsand filtration. The pilot
test will address the effectiveness with respect to the following questions:
1. How effective is slowsand filtration as a pretreatment to RO? Specifically,
does a slowsand system provide adequate removal of particulates that foul RO
membranes and reduce RO productivity?
2. Because TOC levels affect levels of disinfection byproducts produced during
chlorination or chloramination and because TOC levels may affect biological
fouling of R0 membranes, what is the TOC removal of slowsand filtration?
The SARWMS Report recommended pilot testing on Colorado River water (CAP water)
to verify that the cost evaluation was accurate.
rtzr The SARWMS SSF pilot provides an independent (and unbiased) evaluation
using the detailed analysis found in the August 2000 final report, Appendix E.
ow For the SARWMS SSF Pilot, we completed extensive quality control measures
in specifying and placing the sand in the filter.
IQ' The SARWMS SSF Pilot continues the successful participation by SARWMS
members in seeking Regional approaches for water resource planning by focusing
on one of several unanswered issues.
Fa' The SSF Pilot allows the water providers to develop on staff expertise in the
assembly and operation of technically advanced water treatment systems.
we By participating in this effort, the SARWMS partners have effectively been
able to leverage up to $340,000 of Federal dollars provided by the Bureau of
Reclamation.
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Slowsand filter design/Pilot Comparison
(see SARWMS, Table E-2)
Design criteria Full scale Pilot
Period of operation 24 hours/day 24 hours/day
Product flow 40.14 MGD 22 gal/minute or
31,680 gallons/day
Hydraulic loadingrate 0.112 gpm/ft2 0.112 gpm/ft2
Y
Total filter area 330,450 ft2 or 200 ft2
7.6 acres (16-foot diameter)
Number of filters 1 with 4 cells at one
13.38 MGD each
Initial height of filter sand bed 3.0 ft 3.0 ft
Minimum height of filter sand bed 1.5 ft 1.5 ft
Sand effective size, d10 0.27 to 0.33 mm 0.27 to 0.31 mm
Sand uniformity coefficient, d60/d101 Less than 2.5 0.67
Height of underdrains, including 1.5 ft 1.5 ft
gravel layer
Height of supernatant water 5 ft 4.5 ft
Free board 2 ft 0.5 ft
Total filter basin depth 9.45 ft 10 ft
1 The ratio of the sieve size through which 60 percent of the sand will pass to the size through which 10
percent will pass.
Economic Benefits of
sing Low-Salinity Wa
Si Savings frompurchasing, installing, &
9
o eratin bottled water or home
operating
water filtration systems
® Savings of water lost with softeners & RO units
® Savings by providinlow-salinitywater
to ALL household appliances
(fewer repair & replacement costs)
• Uses less laundrydetergent and other soaps
• Car radiator life is extended
City of MWD of
Item Tucson S . C alifornia
ReducingGalvanized 0.7 6 1 .17
•
pipes
salinity W Ater heaters 0.8 1 0 .9 1
Garbage 0 .02 0 .19
from disposals
C lothes 0.1 4 0 .84
700 m /L w ashers
Evaporative 0.1 8 -
to 200 m coolers
C a r radiators 3 .3 6 -
Toilet 0.01 -
m echanism s
D ishw ashers 0.23 0 .68
Faucets 0.28 0 .57
P ool 0.19 -
equip m ent
C lothes 0.3 8 -
:;-,/month per replacement
; � ss
D etergents 0 .3 6 0 .13
sin ale-famish. Lawn watering 0.0 8
residence -
B ottled water 3 .46
H o rn e filtration 3 .9 8 0 .0 8
of Bottled
w ater
W ater - 1 .40
softeners
Total 14.24 5 .98
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