HomeMy WebLinkAbout45_Water Quality Assessment and Monitoring PlanCity of Greensboro
NPDES Permit Program
Water Quality
Assessment
and Monitoring Plan
GREENSBORO
NORTH CAROLINA
Permit Number NCSOOO248
July 2020
�NSB J City of Greensboro — Water Quality Assessment and Monitoring Plan — July 2020
Table of Contents
Section 1 Purpose 2
Section 2 General Water Quality Monitoring Program 2
2.1 Monitoring Methods 2
2.2 Sample Types and Frequency 2
2.3 Monitoring Parameters 2
Section 3 Monitoring Sites 3
3.1 Basis for Locating Monitoring Sites 3
3.2 Site Locations/Descriptions 3
3.3 Site Map 4
Section 4 Sample and Data Analysis 5
4.1 Sample Analytical Methods 5
4.2 Quality Assurance 5
4.3 Record Keeping 5
Section 5 Data Evaluation and Assessment 6
5.1 Methods for Evaluating and Assessing Data 6
5.2 Reporting 6
5.3 Monitoring Plan Revisions 6
List of Tables:
Table 2-1: Water Quality Monitoring Parameters 2
Table 3-1: City Water Quality Monitoring Sites 3
Table 4-1: Analytical Methods and Minimum Reporting Levels 5
List of Figures:
Figure 3-1: City Water Quality Monitoring Sites 4
L K G City of Greensboro — Water Quality Assessment and Monitoring Plan — July 2020
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Section 1: Purpose
The purpose of the Water Quality Assessment and Monitoring Program is to monitor
and assess the quality of streams within the City of Greensboro. Information gained
from this program may be used to help identify and eliminate sources of pollution and
illicit discharges, track short-term and long-term trends, and, where possible, gauge the
effectiveness of stormwater management efforts and programs conducted by the City.
Section 2: General Water Quality Monitoring Program
2.1 Monitorina Methods
Monitoring methods utilized in this plan will consist of directly accessing the stream to
conduct specified monitoring within the stream channel at a point representative of the
overall stream flow at the time of monitoring. In most cases, this will be center channel
of the stream. When possible, staff will enter the stream and directly fill sample bottles
from the stream flow.
2.2 Sample Types and Frequency
Samples collected under this plan will be fixed interval grab samples taken at each site
on a quarterly basis (at a minimum). A specific day of each quarter (the third
Wednesday of the first month) will be assigned for monitoring to allow for sampling over
a range of flows at each monitoring location.
2.3 Monitoring Parameters
Table 2-1 provides a list of the water quality parameters sampled at the monitoring
sites.
Table 2-1: Water Quality Monitoring Parameters
Parameters
Alkalinity
Total Suspended Solids
BOD
Turbidity
COD
Copper
Hardness
Zinc
Fecal Coliform
Cadmium
Total Phosphorus
Lead
Nitrite Nitrogen
Dissolved Oxygen
Total K'eldahl Nitrogen
Temperature
Nitrate Nitrogen
Conductivity
Total Dissolved Solids
pH
�NSB J City of Greensboro — Water Quality Assessment and Monitoring Plan — July 2020
Section 3Section 3: Monitoring
3.1 Basis for Locatina Monitorina Sites
The goal of the WQ monitoring program plan will be to locate monitoring sites within
each major watershed in the City to characterize water quality conditions within the
watershed. Six monitoring sites will be utilized under this plan to monitor and assess
water quality conditions in the City: two in North Buffalo Creek, two in South Buffalo
Creek, and two in Greensboro's water supply watersheds. For North and South Buffalo
Creek Watersheds, one site is located at an upstream point within the watershed and
one is located at a downstream point within the watershed. The two water supply
watershed sites are located at sites upstream of the city's drinking water reservoirs.
3.2 Site Locations/Description
Table 3-1 contains the description and location of the six monitoring sites within the
monitoring plan.
Table 3-1: Description of City of Greensboro Water Quality Monitoring Sites
Site Name
Stream
Location
Merritt
South Buffalo Creek, Upper
Upstream of Merritt Drive bridge over South Buffalo
Creek
McConnell
South Buffalo Creek, Lower
Downstream of McConnell Road bridge over South
Buffalo Creek
Aycock
North Buffalo Creek, Upper
Downstream of Josephine Boyd Street bridge over
North Buffalo Creek
Rankin Mill
North Buffalo Creek, Lower
Downstream of Rankin Mill Road bridge over North
Buffalo Creek
Battleground
Horsepen Creek
Downstream of Battleground Avenue over Horsepen
Creek
Bunch
Reedy Fork Creek
Upstream of Bunch Road bridge over Reedy Fork
Creek
L J
GREEN OJ City of Greensboro — Water Quality Assessment and Monitoring Plan — July 2020
3.3 Site Map
Figure 3-1 shows the location of the six monitoring sites within the monitoring plan.
Figure 3-1: Greensboro Water Quality Monitoring Sites
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�NSB J City of Greensboro — Water Quality Assessment and Monitoring Plan — July 2020
Section 4: Sample and Data Analysis
4.1 Sample Analvtical Methods
Table 4-1 shows the monitoring parameters, reporting limits, and analytical methods
used to analyze samples collected under the plan.
Table 4-1: Laboratory Analytical Methods and Quantitation Limits
Parameter
Quantitation
Limit
Units
Method
Alkalinity, Total
1.0
mg/L
SM2320 B-2011
NO-3-N (Nitrate Nitrogen)
0.050
mg/L
SM4500NO3 E-2011
BOD-5
2.0
mg/L
SM5210 B-2011
Cadmium, Total
0.0002
m /I
EPA 200.8
COD
5.0
mg/L
EPA 410.4
Copper, Total
0.002
mg/L
EPA 200.8
Dissoved Solids
25.0
mg/L
SM2540 C-2011
Fecal Coliform
1.0
ecfu/100 mL
SM9222 D-2006
Hardness, Total
1.0
m /L
SM2340 C-2011
Lead, Total
0.003
mg/L
EPA 200.8
NO-2-N (Nitrite Nitrogen)
0.010
mg/L
SM4500NO3 E-2011
Total Kjeldahl Nitrogen
0.10
mg/L
SM4500Norg B-2011
Total Phosphorus
0.010
m /L
SM4500 PE-2011
Total Suspended Solids
5.0
m /L
SM2540 D-2011
Zinc, Total
0.005
mg/L
EPA 200.8
4.2 Quality Assurance
The City contracts with a state certified laboratory to analyze water samples; physical
parameters are obtained by City Stormwater staff. The City follows the North Carolina
Department of Environmental Quality (NCDEQ) approved procedures, addressing
sample handling, preservation, transportation, equipment calibration and maintenance,
laboratory protocols, and QA/QC methods.
4.3 Record Keeping
All records and data generated under the monitoring program will be maintained for a
minimum period of five years. Field and laboratory data are stored in both electronic
and hard copy formats. Hard copy field notes, log books, and calibration records are
also maintained.
�NSB J City of Greensboro — Water Quality Assessment and Monitoring Plan — July 2020
Section 5: Data Evaluation and Assessment
5.1 Methods for Evaluatina and Assessina Data
As data is assimilated, the City will analyze the various pollutant parameters in the
program and conduct statistical analysis on the data to determine trends, where
possible. At a minimum, data will be graphically represented to visualize trends.
5.2 Reporting
Data results will be managed and stored in a similar manner as other water quality data
collected by the city's Stormwater Management Division and will adhere to procedures
outlined in the divisions Quality Assurance Project Plan (QAPP). Annual summary
reports will include the number of samples collected, number and types of parameters
analyzed, and data analysis activities to determine trends. Data generated from the
Water Quality Assessment and Monitoring Plan will be available upon request.
5.3 Monitoring Plan Revisions
The City will review the monitoring plan annually as part of the data analysis and annual
report process to determine if any revisions to the plan are necessary based on the past
year's assessment and monitoring activities. If revisions are necessary, the City will
revise the plan and submit the revisions to NCDEQ for review and approval.