HomeMy WebLinkAboutI-47_CY2020 Stream Miles Suitable for Human Contact_07.16.2021I ® PUBLIC WORKS
CITY OF DURHAM
July 16, 2021
Stream Miles Suitable for Human Contact in the City of Durham for Calendar Year 2020
Table 1. Stream Miles Suitable for Human Contact for Calendar Year 2020. Results Based on Average Fecal Coliform Concentrations for the City of Durham's Ambient Stream
Monitoring Sites.
Number of sample events
Average fecal
• =
Total Stream
o
Stream miles represented
used to calculate average
coliform
Suitable for
m
Watershed
Major Stream
Site ID
Miles Suitable for
�
v
by each sampling location
fecal coliform
concentration
human contact?
>
concentrations
(cfu/300mL)
Human Contact
Ellerbe Creek
EL1.9EC
46.0
6
114
Yes
64.2 miles
Ellerbe
Ellerbe Creek
EL7.1EC
18.2
6
159
Yes
(99.9%)
Ellerbe Creek
EL8.6SECUT
0.05
4
855
No
Eno River
EN4.9ER
76.9
5
829
No
=
s
Eno
Eno River
EN8.9ER
65.1
7
827
No
10.9 miles
m
v
Eno River
EN13.3ER
7.72
4
250
Yes
(7.13%)
Warren Creek
EN10.3WC
3.18
5
104
Yes
Lick Creek
LC1.11-C
55.4
5
2052
No
11.9 miles
Lick
z
Rocky Branch
LC2.0RBC
11.9
4
2078
No
(17.7%)
Little Lick Creek
LL3.4LLC
14.9
6
800
No
0 miles
Little Lick
Little Lick Creek
LL4.6LLT2
5.56
5
217
Yes
(0%)
0 miles
Little River
Little River
LR9.6LR
15.9
5
742
No
(0%)
14.6 miles
New Hope
Sandy Creek
NH3.3SC
14.6
9
197
Yes
(100%)
Northeast Creek
NEO.ONE
4.80
5
782
No
QJ
t
0 miles
M
m
�
Northeast
Northeast Creek
NE1.2NE
32.1
5
714
No
m
v
(0%)
v
m
North Prong
NE2.2NP
11.5
5
1046
No
v
Third Fork Creek
TFI.OTC
26.7
10
2559
No
m
Third Fork Creek
TF2.5TCTC
6.52
8
4767
No
J
lL
Third Fork Creek
TF3.4TC
7.97
10
4435
No
-°
0 miles
Third Fork
Third Fork Creek
TF4.4TC
5.97
8
2745
No
u
o
(0%)
Third Fork Creek
TF5.4TC
7.86
8
1072
No
Rock Creek
TF5.1RC
5.11
8
6159
No
Rock Creek
TF6.5RCUT
0.34
8
3580
No
The total stream miles is a sum of the miles represented by sampling locations with suitable ratings.
The results presented in the table above were impacted by changes in sampling protocols due to the COVID-19 pandemic in 2020.
Page 1
Table 2. Percentage of Stream Miles Suitable for
Human Contact for Calendar Year 2020 by Watershed
and Citywide.
r-
Percentage of
N
L
Stream Miles
m
Watershed
a
v
Suitable for Human
j
Contact
cc
c
Ellerbe
99.9%
m
�
v
Eno
7.13%
Lick
17.7%
iY
v
�
Y
J
Little Lick
0%
z
Little River
0%
v
New Hope
100%
m
m
v
v
m
�
v
Y
Northeast
0%
lL
J
G7
Q
�
u
`o
Third Fork
0%
Citywide
21.5%
Page 2
Table 3. Fecal Coliform Concentrations for the City of Durham's Ambient Stream Monitoring Sites during Calendar Year 2020.
Fecal Coliform Concentration (cfu/300mL)
Ellerbe Creek
Eno River
Lick Creek
Little Lick Creek
Little River
Northeast Creek
Third Fork Creek
Month
EL1.9EC
EL7.1EC
EL8.6SECUT
EN4.9ER
EN8.9ER
EN10.3WC
EN13.3ER
LC1.1LC
LC2.ORBC
LL3.4LLC
LL4.6LLT2
LR9.6LR
NH3.3SC
NEO.ONE
NE1.2NE
NE2.2NP
TFI.OTC
TF2.5TCTC
TF3.4TC
TF4.4TC
TF5.4TC
TFS.IRC
TF6.5RCUT
January
120
120
740
440
920
155
180
N/A
N/A
N/A
N/A
400
252
N/A
N/A
N/A
255
175
1625
55
37
69
127.5
February
81
56
365
78
84
100
88
120
115
590
2950
63
70
250
328
318
135
295
100
210
11
580
480
March
107.5
70
215
110
15
125
38
77
66
77
520
33
52
42
80
110
125
125
107
125
150
31
135
April
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
May
120
140
N/A
N/A
102.5
N/A
N/A
N/A
N/A
N/A
N/A
N/A
77
N/A
N/A
N/A
125
N/A
600
N/A
N/A
N/A
N/A
June
115
440
N/A
N/A
123
N/A
N/A
N/A
N/A
460
N/A
N/A
145
N/A
N/A
N/A
480
N/A
760
N/A
N/A
N/A
N/A
July
N/A
N/A
N/A
N/A
N/A
N/A
N/A
1273
N/A
4200
4000
N/A
440
N/A
N/A
N/A
820
22000
3000
2550
900
14000
10000
August
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
2900
2200
3900
23000
14000
37000
18000
5600
32000
3100
September
N/A
N/A
N/A
N/A
N/A
N/A
N/A
2091
560
4775
2200
N/A
500
540
500
440
190
420
680
600
1080
620
14500
October
140
130
2100
140
115
150
111
N/A
N/A
N/A
N/A
114
100
N/A
N/A
N/A
190
140
225
145
520
570
115
November
N/A
N/A
N/A
N/A
N/A
N/A
N/A
440
125
620
720
N/A
140
180
460
460
272
983
256
273.5
276
1400
185
December
N/A
N/A
N/A
3375
3000
720
N/A
N/A
N/A
N/A
N/A
3100
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Annual Average
1 114
1 159
1 855
1 829
1 827
1 250
104
1 800
1 217
1 2052
i 2078
742
197
1 782
1 714
1 1046
1 2559
1 4767
1 4435
I 2745
1 1072
i 6159
3580
Average values from months when duplicate samples were collected are highlighted in grey.
Values from months when duplicate samples were not collected are highlighted in light blue.
N/A indicates that the sample was not collected for analysis, the value was rejected for quality control reasons, or the value was not included due to antecedent rainfall conditions (i.e., greater than 0.1 inches of rain within the previous 48 hours of sample collection).
Bolded values exceed 400 cfu1100mi standards.
Page 3