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Regional Water Quality NEWSLETTER
DATE: Report for August 2017
A Tempe, Glendale, Peoria, Chandler, Phoenix, ADEQ, CAP, SRP, Epcor
NSF Central Arizona-Phoenix Long-Term Ecological Research
ASU Regional Water Quality Partnership
http://faculty.engineering.asu.edu/pwesterhoff/research/regional-water-quality-issues/
SUMMARY
1. There is no new data for Taste and Odor
Compounds due to instrument maintenance.
Ancillary research projects on both Saguaro
Lake and Canyon Lake have observed
significant algal blooms with fish kills
observed on Canyon Lake.
2. DOC values for Saguaro Lake and Lake
Bartlett were only slightly elevated (4.3-5.8
mg/L) as compared to July even though there
were algal blooms. DOC concentrations
ranged from 2.8-3.6 mg/l at the inlets of
water treatment plants which was similar to
July. Algal die off could begin to impact the
source waters more significantly in the near
future.
3. The primary source of surface water
continues to be Salt River Water. Significant
quantities of CAP water are also being used
which helps to decrease the DOC levels.
4. Microbial concentrations for coliforms began
to elevate and the majority of samples were
greater than 1,000 cfu/100 ml. A combination
of rain and high temperatures are the
probable cause of the increase.
Mycobacterium concentrations remain
somewhat elevated as to the values observed
in the summer of 2016.
5. The ASU Regional Water Quality Workshop
will be at the Pera Club on Friday, September
29th from 8:30-11:30.
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Topics Du Jour
Microbial Water Quality Data
Over the years the regional water quality center has collected data on numerous different topics but very
little data has been collected on basic microbial water quality. Therefore, we have initiated microbial
sampling for E. Coli, total coliforms and mycobacterium in the canal system to determine potential
impacts on both water quality and sources of possible contamination. Note that Mycobacterium
require one month to process and the samples are from November.
All Values are cfu per 100 ml
Sample E. coli Coliform
Blank Average 0 0
AZ Canal at Highway 87 average 22 1232
South Canal below CAP Cross- connect average 50 1296
Cap Canal at Cross-connect average 26 1176
AZ Canal at 56th St. average 7 872
AZ Canal- Central Avenue average 13 896
Pima Average 26 1520
AZ Canal above CAP Cross-connect average 21 1432
Waddell Canal average 0 1648
Verde River @ Beeline average 23 752
AZ Canal below CAP Cross-connect average 41 1432
head of the Consolidated Canal average 6 824
Middle of Consolidated Canal average 5 1208
Head of Tempe Canal average 28 1072
Mycobacterium (July) colonies
Blank 0
AZ Canal at Highway 87 12
South Canal below CAP Cross- connect 16
Cap Canal at Cross-connect 0
AZ Canal at 56th St. 35
AZ Canal- Central Avenue 21
AZ Canal at Pima 5
AZ Canal above CAP Cross-connect 2
Waddell Canal 16
Verde River @ Beeline 36
AZ Canal below CAP Cross-connect 1
head of the Consolidated Canal 28
Middle of Consolidated Canal 10
Head of Tempe Canal 7
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CONT – Contaminated with other bacteria
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Quick Update of Water Supplies for August 7th, 2017
(during day of canal/WTP sampling – August 7th, 2017)
Source Trend in supply Discharge to
water supply system
Flow into SRP Canal System
Dissolved organic carbon Concentration (mg/L) **
Salt River Reservoirs at 70% full
519 cfs 630 cfs into Arizona Canal
488 cfs into South Canal
381 cfs of CAP water
into Arizona Canal
271 cfs Groundwater Pumping into SRP
Canals
4.6 mg/L
Verde River Reservoirs At 61% full
203 cfs 4.0 mg/L
Colorado River
Lake Pleasant is 56.6% full (Lake Powell is
61.6% full)
Lake Pleasant is* releasing 1610 cfs
3.1 mg/L
Groundwater Pumping *** 271 cfs pumping by SRP
0.5 to 1 mg/L
*CAP is not releasing from Lake Pleasant **Concentration of DOC in the terminal reservoir ***CAP water is being delivered to the Arizona Canal. Data from the following websites:
http://www.srpwater.com/dwr/ http://www.cap-az.com/departments/water-operations/lake-pleasant http://lakepowell.water-data.com/
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The following views are from SRP website, and show which wells are operating along the
various canals.
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Dissolved Organic Carbon In Reservoirs and Treatment Plants DOC = Dissolved organic carbon
UV254 = ultraviolet absorbance at 254 nm (an indicator of aromatic carbon content)
SUVA = UV254/DOC
TDN = Total dissolved nitrogen (mostly nitrate from groundwater)
Reservoir Samples - August 7th-8th, 2017
Sample Description Location DOC (mg/L) UV254 (l/cm)
SUVA (L/mg-
m)
TDN (mg/L
Havasu (March) 3.0 0.047 1.5 0.3930
Lake Pleasant (March) Epilimnion 3.2 0.058 1.8 0.3748
Hypolimnion 4.9 0.059 1.2 0.3301
Verde River at Tangle 1.4 0.041 2.9 0.4175
Verde River at Beeline Highway 4.0 0.110 2.8 0.3559
Bartlett Reservoir Epilmnion 5.6 0.127 2.3 0.4830
Hypolimnion 6.4 0.162 2.5 0.6309
Saguaro Lake
Epilimnion 4.6 0.097 2.1 0.4037
Epi - Duplicate 5.4 0.101 1.9 0.5589
Hypolimnion 4.3 0.096 2.2 0.6627
Salt River at Blue Point Bridge 4.6 0.083 1.8 0.3577
Salt River above Roosevelt N/A n/a #VALUE! n/a
Roosevelt Reservoir Point 1 Epilmnion 6.1 0.135 2.2 0.5180
Hypolimnion 5.0 0.122 2.5 0.6180
Roosevelt Reservoir Point 2 Epilmnion 5.5 0.099 1.8 0.5237
Hypolimnion 5.1 0.113 2.2 0.7356
Apache Reservoir Point 1 Epilmnion 4.7 0.087 1.8 0.4977
Hypolimnion 4.9 0.097 2.0 0.9046
Apache Reservoir Point 2 Epilmnion 4.9 0.086 1.8 0.5723
Hypolimnion 5.4 0.088 1.6 0.9873
Canyon Reservoir Point 1 Epilmnion 5.3 0.101 1.9 0.5035
Hypolimnion 6.7 0.110 1.6 1.1690
Canyon Reservoir Point 2 Epilmnion 4.5 0.096 2.1 0.5521
Hypolimnion 4.7 0.097 2.0 0.6636
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Water Treatment Plants- August 7th-8th, 2017
Sample Description DOC (mg/L) UV254 (l/cm)
SUVA (L/mg-m)
TDN (mg/L
Union Hills Inlet 3.1 0.057 1.8 0.3585
Union Hills Treated 2.6 0.026 1.0 0.2979
Tempe North Inlet 3.6 0.079 2.2 0.3298
Tempe North Plant Treated 2.4 0.024 1.0 0.6258
Tempe South Inlet 2.8 0.061 2.2 0.4874
Tempe South Plant Treated 2.0 0.025 1.3 0.5652
Greenway WTP Inlet 3.3 0.065 2.0 0.7814
Greenway WTP Treated 2.4 0.026 1.1 0.7407
Glendale WTP Inlet 3.4 0.068 2.0 0.3783
Glendale WTP Treated 2.2 0.026 1.2 0.3128
Anthem WTP Inlet 3.4 0.057 1.7 0.3897
Anthem WTP Treated 3.4 0.058 1.7 0.4022
24th Street WTP Inlet 3.6 0.065 1.8 0.3462
24th Street WTP Treated 2.1 0.020 0.9 0.2811
Chandler WTP Inlet 3.2 0.074 2.3 0.4626
Chandler WTP Treated 0.3 0.032 11.2 0.1974
Rivers and Canals- August 7th-8th, 2017
Sample Description DOC (mg/L) UV254 (l/cm)
SUVA (L/mg-m)
TDN (mg/L
Waddell Canal 3.1 0.062 2.0 0.3643
Anthem WTP Inlet 3.4 0.057 1.7 0.3897
Union Hills Inlet 3.1 0.057 1.8 0.3585
CAP Salt-Gila Pumping Station (June) 3.4 0.053 1.6 0.3592
CAP Mesa Turnout (June) 3.2 0.054 1.7 0.3595
CAP Canal at Cross-connect 3.3 0.049 1.5 0.3395
Salt River @ Blue pt. Bridge 4.6 0.083 1.8 0.3577
Verde River @ Beeline 4.0 0.110 2.8 0.3559
AZ Canal above CAP Cross-connect 3.3 0.053 1.6 0.3282
AZ Canal below CAP Cross-connect 6.3 0.074 1.2 0.3342
AZ Canal at Highway 87 4.0 0.078 1.9 0.3390
AZ Canal at Pima Rd. 3.8 0.072 1.9 0.3172
AZ Canal at 56th St. 3.5 0.066 1.9 0.3312
AZ Canal - Central Avenue 3.4 0.063 1.9 0.3149
AZ Canal - Inlet to Glendale WTP 3.4 0.068 2.0 0.3783
AZ Canal - Inlet to Greenway WTP 3.3 0.065 2.0 0.7814
South Canal below CAP Cross-connect 4.4 0.087 2.0 0.3683
Head of Tempe Canal 3.3 0.070 2.1 0.3790
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Tempe Canal - Inlet to Tempe's South Plant 2.8 0.061 2.2 0.4874
Head of the Consolidated Canal 3.3 0.073 2.2 0.3688
Middle of Consolidated Canal 3.0 0.069 2.3 0.4980
Chandler WTP - Inlet 3.2 0.074 2.3 0.463
Taste and Odor
MIB, Geosmin and Cyclocitral are compounds naturally produced by algae in our reservoirs and canals, usually
when the water is warmer and algae are growing/decaying more rapidly. They are non toxic, but detectable to
consumers of water because of their earthy-musty-moldy odor. The human nose can detect these in drinking
water because the compounds are semi-volatile. Since compounds are more volatile from warmer water, these
tend to be more noticable in the summer and fall. The human nose can detect roughly 10 ng/L of these
compounds. Our team collects samples from the water sources and raw/treated WTP samples.
Table 1 - Water Treatment Plants – July 3,
2017 Sample Description MIB
(ng/L)
Geosmin
(ng/L)
Union Hills Inlet <2.0 <2.0
Union Hills Treated <2.0 <2.0
Tempe North Inlet 2.4 <2.0
Tempe North Plant Treated 2.7 <2.0
Tempe South WTP <2.0 <2.0
Tempe South Plant Treated 2.7 2.6
Anthem Inlet <2.0 <2.0
Anthem Treated <2.0 <2.0
Chandler Inlet 3.5 2.1
Chandler Treated 4.0 3.3
Greenway WTP Inlet 3.5 <2.0
Greenway WTP Treated <2.0 <2.0
Glendale WTP Inlet 2.3 <2.0
Glendale WTP Treated <2.0 <2.0
24th St. WTP Inlet 2.4 <2.0
24th St. WTP Outlet <2.0 <2.0
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Table 2 - Canal Sampling – July 3, 2017
System Sample Description MIB
(ng/L)
Geosmin
(ng/L)
CAP Waddell Canal <2.0 <2.0
Union Hills Inlet <2.0 <2.0
CAP Canal at Cross-connect <2.0 <2.0
Salt River @ Blue Pt Bridge 2.9 <2.0
Verde River @ Beeline 10.0 <2.0
AZ AZ Canal above CAP Cross-
connect <2.0 <2.0
Canal AZ Canal below CAP Cross-
connect 2.3 <2.0
AZ Canal at Highway 87 2.7 <2.0
AZ Canal at Pima Rd. 2.4 <2.0
AZ Canal at 56th St. 2.5 <2.0
AZ Canal - Central Avenue 2.1 <2.0
AZ Canal - Inlet to Glendale
WTP 2.3 <2.0
Head of the Consolidated Canal 2.7 <2.0
Middle of the Consolidated
Canal 3.0 <2.0
South South Canal below CAP Cross-
connect 3.5 <2.0
Tempe Head of the Tempe Canal 3.0 <2.0
Canals Tempe Canal - Inlet to Tempe's
South Plant <2.0 <2.0
Salt-Gila (June) <2.0 <2.0
Mesa Turnout (June) <2.0 <2.0
Table 3 - Reservoir Samples – July 5, 2017
Sample
Description
Location MIB
(ng/L)
Geosmin
(ng/L)
Lake Pleasant
(June)
Eplimnion <2.0 <2.0
Lake Pleasant
(June)
Hypolimnion 2.8 7.5
Verde River @
Beeline
10.0 <2.0
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Bartlett Reservoir Epilimnion ns ns
Bartlett Reservoir Epi-near dock <2.0 2.4
Bartlett Reservoir Hypolimnion ns ns
Salt River @ BluePt
Bridge
2.9 <2.0
Saguaro Lake Epilimnion ns ns
Saguaro Lake Epi - Duplicate ns ns
Saguaro Lake Epi-near dock <2.0 <2.0
Saguaro Lake Hypolimnion ns ns
Lake Havasu
(June)
<2.0 <2.0
Verde River at
Tangle Creek
(June) <2.0 <2.0
Roosevelt at Salt
River Inlet
ns ns
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Table 3 - Reservoir Samples – June 5, 2017
Sample
Description
Location MIB
(ng/L)
Geosmin
(ng/L)
Lake Pleasant
(May)
Eplimnion <2.0 <2.0
Lake Pleasant
(May)
Hypolimnion 3.9 <2.0
Verde River @
Beeline
<2.0 <2.0
Bartlett Reservoir Epilimnion
Bartlett Reservoir Epi-near dock 3.9 11.0
Bartlett Reservoir Hypolimnion
Salt River @
BluePt Bridge
2.3 2.4
Saguaro Lake Epilimnion
Saguaro Lake Epi - Duplicate
Saguaro Lake Epi-near dock 3.0 2.5
Saguaro Lake Hypolimnion
Lake Havasu
(May)
<2.0 2.4