1 Regional Water Quality NEWSLETTER DATE: Report for July 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. Taste and Odor compounds for all canals and WTPs were near or below detection limits (2 ng/l). Reservoir samples were also below the threshold level of 10 ng/l except for the Verde River sample at Beeline which had 10 ng/l of MIB. 2. DOC values for all water sources were slightly lower than the elevated levels observed in June. DOC concentrations ranged from 2.6-3.9 mg/l at the inlets of water treatment plants. This trend had been observed in Saguaro Lake for the last five years and is believed to be algal related. 3. The primary source of surface water continues to be Salt River Water. Significant quantities of CAP water are also being used. Releases from Lake Pleasant contribute over 75% of the CAP water. 4. Microbial concentrations for coliforms were similar to the concentrations observed over the last two months with typical values of 1,000 cfu/100 ml. Mycobacterium concentrations in July were lower than the concentrations observed in June, however the concentrations are still elevated in comparison to 2016.
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Regional Water Quality NEWSLETTER
DATE: Report for July 2017
A Tempe, Glendale, Peoria, Chandler, Phoenix, ADEQ, CAP, SRP, Epcor
NSF Central Arizona-Phoenix Long-Term Ecological Research
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 11 1200
South Canal below CAP Cross- connect average 19 1040
Cap Canal at Cross-connect average 10 744
AZ Canal at 56th St. average 5 1048
AZ Canal- Central Avenue average 93 1056
Pima Average 3 872
AZ Canal above CAP Cross-connect average 12 704
Waddell Canal average 1 600
Verde River @ Beeline average 13 1440
AZ Canal below CAP Cross-connect average 11 1208
head of the Consolidated Canal average 14 1136
Middle of Consolidated Canal average 1 1416
Head of Tempe Canal average 12 1056
Mycobacterium (June) colonies
Blank 0
AZ Canal at Highway 87 26
South Canal below CAP Cross- connect CONT
Cap Canal at Cross-connect 3
AZ Canal at 56th St. 4
AZ Canal- Central Avenue 10
AZ Canal at Pima 11
AZ Canal above CAP Cross-connect 0
Waddell Canal 1
Verde River @ Beeline 50
AZ Canal below CAP Cross-connect 14
head of the Consolidated Canal CONT
2
Middle of Consolidated Canal 20
Head of Tempe Canal 0
CONT – Contaminated with other bacteria
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Quick Update of Water Supplies for July 5th, 2017
(during day of canal/WTP sampling – July 5th, 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 71% full
955 cfs 759 cfs into Arizona Canal
855 cfs into South Canal
409 cfs of CAP water
into Arizona Canal
144 cfs Groundwater Pumping into SRP
Canals
4.6 mg/L
Verde River Reservoirs At 61% full
207 cfs 4.6 mg/L
Colorado River
Lake Pleasant is 74.7% full (Lake Powell is
63.5% full)
Lake Pleasant is* releasing 2410 cfs
3.3 mg/L
Groundwater Pumping *** 144 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: