Item #12 - FY2021-2022 Dry weather outfall screening SOPs & Schedule

Wlnstoneosidem
Winston-Salem
Dry -Weather
Discharge
Screening
Standard Operating
Procedures
Version 0
Winston-Salem, North Carolina
January 25, 2022

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City of Winston-Salem I Dry -Weather Discharge Screening Standard Operating Procedures ���
Content
Content
1 Purpose and Background....................................................................................................
1
1.1 Resources...................................................................................................................
3
1.2 Safety..........................................................................................................................
3
2 Preparation.........................................................................................................................
4
3 Mobilization.........................................................................................................................5
4 Outfall Screening................................................................................................................
5
4.1 Iron Oxidizing Bacteria.................................................................................................
9
5 Follow -Up Investigation......................................................................................................11
6 Enforcement......................................................................................................................12
7 Documentation...................................................................................................................12
8 Procedure Management.....................................................................................................13
Tables
Table 1 Dry -weather discharge screening resources................................................................. 3
Table 2 Allowable stormwater discharge sources......................................................................11
Table 3 Dry -weather discharge sampling parameters...............................................................12
Figures
Figure 1 Outfall screening process flowchart..............................................................................
2
Figure 2 Collector app link to Survey123....................................................................................
6
Figure 3 Survey123 outfall screening form prepopulated data ....................................................
7
Figure 4 Survey123 form new data collection.............................................................................
8
Figure 5 Dry weather discharge screening.................................................................................
9
Figure 6 Water quality strip test.................................................................................................10
Appendices
Appendix A - Photos
Appendix B - Revision Log
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City of Winston-Salem I Dry -Weather Discharge Screening Standard Operating Procedures
Content
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City of Winston-Salem I Dry -Weather Discharge Screening Standard Operating Procedures ���
Purpose and Background
1 Purpose and Background
To meet the City of Winston-Salem's (the City) Municipal Separate Storm Sewer System (MS4)
permit requirements for Illicit Discharge Detection and Elimination (IDDE) control measure, the
City is responsible for "detecting and tracing sources of illicit discharges and for removing the
sources or reporting the sources to the State to be properly permitted". Dry weather discharge
screening is a proactive measure for detecting frequent illicit discharges or illicit connections to
the City's MS4 or surface waters of the United States. These screenings may remedy acute and
sometimes toxic pollutant loadings to surface waters that could lead to or cause impairments.
The City strategically selects stormwater outfalls to dry weather screen annually. Stream
reaches are prioritized based on ambient pollutant concentrations of fecal coliform and total
suspended solids (TSS) due to the active Total Maximum Daily Load (TMDL) with City limits.
Outfalls on the most impaired streams are prioritized for dry weather screening at the beginning
of the permit year.
The dry weather screening process and subsequent procedure is organized into six steps:
Preparation, Mobilization, Outfall Screening, Follow -Up Investigation, Enforcement, and
Documentation.
1. Preparation involves steps for planning and selection of outfalls to be screened for the
current year's, setting up and refreshing software applications to support screening, and
incorporating any new data since last previous efforts.
2. Mobilization involves the tasks typically completed in the days prior to going out in the
field including preparing equipment, safety planning, monitoring rainfall, and reviewing
access points and travel logistics.
3. Outfall screening process is the qualitative assessment of every outfall identified or
discovered along a selected stream reach for a dry weather discharge and recording of
observations. Depending on the observations made, a preliminary investigation is
performed in the field to determine if the discharge is allowable or requires further
investigation.
4. Follow-up investigation is recommended for potentially illicit discharges or those that
cannot readably be investigated in the field. The follow-up investigation is handed off to
another team within the City for conducting more thorough tracing of the discharges that
may lead to enforcement proceedings.
5. Enforcement involves a variety of proceedings for classifying the discharge as illicit,
eliminating the illicit discharge, and employing measures within the City's IDDE
ordinance and policies to reduce the risk of recurrence.
6. Documentation involves recording observations, communications, and actions taken by
all parties involved for steps from Outfall Screening through Enforcement.
A flowchart of this dry -weather screening process and subsequent steps is provided in Figure 1.
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Existing Outfall
Fill out Survey123
form for each outfall
observed
Fill out dry weather
screening section of
survey
Sampling
Perform water quality
sampling investigation
Preparation
Mobilization
New Outfall
Outfall Add a point on Fill out Survey123
Collector app for any form for each new
Screening
new outfalls located observed outfall
Is discharge present
at the outfall?
Determine if further
investigation is needed
based on physical
observations
Follow-up
Necessary
Submit survey fr9,,
investigation
1
Office staff review and
determine if sampling is
needed
Use sampling results to
determine if the discharge is
allowable or illicit
Trace and
LLeliminate discharge
source
Confirm existing
information and submit
survey form
No Follow-up
Necessary t
No Sampling
Necessary.
T
Allowable
Screening
Complete
Update investigation
status to "Complete"
in database
Export and compile final
screening reports
Figure 1.Outfall Screening Process Flowchart

City of Winston-Salem I Dry -Weather Discharge Screening Standard Operating Procedures ���
Purpose and Background
1.1 Resources
The resources required for screening include qualified staff and certain tools and technologies.
Three main staffing groups should be assembled for this effort - a field team capable of
traversing riparian terrain and walking in creeks for the outfall screening process, investigation
team trained in water quality sampling and investigations practices, and an office team with data
analysis and GIS application skills for preparation, review, and documentation of the process.
Enforcement may be handled by the investigation team or other qualified staff. Necessary tools
and materials are outlined in Table 1.
Table 1 Dry -weather discharge screening resources
Resource Purpose
Pads Used to run data collection applications for screening
and sampling
AGOL Survey123 and Collector Apps Applications used for field data collection to streamline
application and maintain quality
Water quality sampling equipment and lab Suspected illicit discharges may be sampled during the
follow-up investigation
Waders/ boots Field staff will need to wade in streams to access
outfalls
Water quality test strips and YSI Water quality parameters can be detected and
multiparameter meter determined during the outfall screening process
Measuring Tapes Outfall pipe and channel sizes should be measured
Flashlight Helpful for viewing inside of outfall pipes
Safety vest Improves visibility of field staff to others in the area
1.2 Safety
There is inherent risk involved with any field work. All field team and investigation staff are
responsible for being actively involved in hazard analysis and risk reduction procedures.
Potential hazards should be identified and assessed to determine measures to eliminate or
minimize risk before each field activity. Common hazards that should be considered may
include working in waterways, sun/heat/cold exposure, slips/trips/falls, and biological hazards
such as poison ivy, poison oak, ticks, or snakes.
• Basic personal protective equipment (PPE) may include boots, thick layered clothing,
gloves, and eye protection.
• Additional PPE may be seasonal, such as sunscreen, snake chaps, etc., or personally
modified for an individual with a higher risk.
• A first aid kit and fully charged cell phone should be maintained within the field team at
all times.
• Teams should be aware of the closest emergency facilities depending on where they are
working within the City.
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City of Winston-Salem I Dry -Weather Discharge Screening Standard Operating Procedures ���
Preparation
2 Preparation
Prior to each screening effort, the targeted outfalls should be identified and data collection
materials should be prepared. Priority outfalls are identified based on impaired stream segments
that are selected for assessment annually.
1. Office staff analyze ambient pollutant concentrations to determine the streams that are
most impaired. Streams are analyzed for TSS and fecal coliforms since these pollutants
of concern (POC) are targeted for reduction by TMDLs.
2. Streams are divided into segments based on in -stream sampling sites and
ingress/egress points that are safe for the field team to access.
3. The Assistant Stormwater Director determines the streams that are to be assessed
based on the impairment prioritization in the first quarter of the permit year.
4. Prioritized streams are walked and assessed November through February. Outfalls
along these prioritized streams are selected for dry weather screening.
ArcGIS Online (AGOL) applications have been developed to assist in data collection and
tracking. An AGOL Collector map is used to display and collect the spatial location of each
outfall while a Survey123 form is used to collect attribute data for each outfall point. An AGOL
dashboard has been developed to track outfall screening progress. Further preparation steps
are outlined below.
1. Create an AGOL map with a point layer including all the outfalls that are to be screened.
2. Open the map in the AGOL Collector Application (WS Outfall Inventory Original Data:
Collector (arcgis.com)) and create dynamic links to the Survey123 form for each outfall
point.
3. Link the previously developed Survey123 form (Outfall Dry Weather Screening
(arcgis.com)) to prepopulate with historic information for the outfalls that need screening.
a. Alternatively, if AGOL applications are unavailable for any reason, blank paper
copies of the forms replicating the information in the Survey123 for data
collection can be printed and used in the field.
4. Identify points of access for stream reaches that are to be screened.
a. Access points should be areas where a vehicle can be parked safely and
securely near the stream.
b. Identifying the points may involve dividing streams up into shorter sections for
screening and marking a point on either end of the stream reach to enter and
exit. It may be beneficial to create a shapefile with these access points that can
be viewed in an AGOL map for navigation.
5. Use the existing dashboard at Dashboard: WSSWMP Dry -Weather Outfalls Field
Review (arcqis.com) to track the outfall screening process.
These preparation measures should be performed by the team of office staff prior to any field
screenings. This establishes the data management and organization for the rest of the dry
weather screening process.
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City of Winston-Salem I Dry -Weather Discharge Screening Standard Operating Procedures ���
Mobilization
3 Mobilization
After preparations have been completed, field staff may begin dry -weather discharge screening.
Inspections may only occur when there has been no recorded precipitation >0.1 inches in the
previous 72 hours. Once dry weather has been confirmed, mobilization processes may begin to
prepare for ensuing field work.
1. Check weather and verify there is no recorded precipitation >0.1 inches in the last 72
hours.
a. Precipitation is monitored using Smith Reynolds Airport Weather Logs (National
Weather Service: Observed Weather for past 3 Days: Winston Salem, Smith
Reynolds Airport).
2. Determine stream reaches to be screened for the day.
3. Ensure tablets are fully charged and have the Collector App and the Survey123 app with
the Outfall Inventory survey downloaded.
4. Gather necessary equipment which should include the items listed in Table 1.
5. Review field safety guidelines and complete job hazard analysis.
6. Drive to the stream access point identified for the area chosen for inspection.
a. If your team has two vehicles, park one at either end of the stream reach to
facilitate single track screening and eliminate backtracking.
Field staff must be properly prepared before beginning outfall screening to ensure that the
screening process is performed safely and effectively.
4 Outfall Screening
The Survey123 form will be utilized for dry weather screening. It provides the field team with
background information and locations of existing outfalls. The form directs the team through the
screening process by guiding collection of qualitative information and providing prompts to take
photos. If flow is present, the field team will perform a screening assessing the physical
characteristics of the discharge. They will then make a determination to identify the outfall for
further investigation if necessary.
1. Walk the selected stream reach identifying new outfalls and inspecting all outfalls that
are located along the reach.
2. Complete an outfall screening survey for each outfall.
a. Using the AGOL Collector map, select the point for the outfall to be screened or
add a new point for a new outfall.
b. Once the outfall point is selected, click the pop-up link to the Survey123 form as
shown in the red box in Figure 2.
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City of Winston-Salem I Dry -Weather Discharge Screening Standard Operating Procedures ���
Outfall Screening
8,20 AM -Qlt29
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Back WS Outfall Inventory Original Data: Collector Q ^•
Oudalls for Screening: 0... ©
• 36.081788°N 80.249573°W
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Figure 2 Collector app link to Survey123
3. Once the Survey123 form is open, review the prepopulated existing information for the
outfall and correct any inaccuracies such as pipe size or material.
a. Information that will be prepopulated and requires review is shown in the red
boxes in Figure 3.
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City of Winston-Salem I Dry -Weather Discharge Screening Standard Operating Procedures ���
Outfall Screening
General Information
Outfall D.
OF_551
Outfall Screening ID:
HDR2021 DF 551
Date and Time:
�_t Friday, October 29,2021 Q 8:20 AM
Inspector: *
Name of Receiving Stream:
Upper Salem Creek
Location Description:
542 ft from the intersection of PARK BV and VINTAGE AV ® a bearing of 95 deg
Time Since Last Rainfall (Days):
IG15 pose -processing)
Pipe Or Channel?
Pipe Channel
Conveyance Material:
CM CP DI DIRT PVC RCP RR TC 0 VD,
OTHER
Type of Single Conveyance-
• DO PO OTHER
Ou[fall Geometry:
ARCH BOX CIR ELLIP • PARA TRAP OTHER
Outfall Position:
• DSRB DSLB HEAD
Figure 3 Survey123 outfall screening form prepopulated data
4. Fill in the general outfall description information including conveyance type and material
and the outfall geometry and position for any new outfalls.
5. Complete the sections for new information for all screenings. This includes structure
condition, narrative description of the outfall location, and determining the presence of
dry -weather discharge. These fields are shown in red boxes in Figure 4.
a. If structure condition is poor, provide a comment describing the issue.
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City of Winston-Salem I Dry -Weather Discharge Screening Standard Operating Procedures ���
Outfall Screening
Dominant Land Use Within Drainage Area:
(GIS post-p—s—,)
Industrial , ,
Does the Facility have a NPDES Stormwater Permit?
Yes No
Has a Discharge been found atthls site before?
Yes No
Narrative Description of Outfall Location:
Approximate Outfalll Locatiore
36°6'N 80.15'W ±65 rn
rat Highlands
Salem ppxl
Latitude:
36.087954
Longitude:
-80245562
Dry Weather Discharge Present?
Yes No
Figure 4 Survey123 form new data collection
6. If a dry -weather discharge is present, complete the dry -weather screening section of the
survey in Figure 5 and determine if the discharge requires follow-up investigation.
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City of Winston-Salem I Dry -Weather Discharge Screening Standard Operating Procedures ���
Outfall Screening
Dry Weather Discharge Present?
• Yes No
Dry Weather Screening
Flow Volume:
Trickle Moderate Substantial
Odor?
Yes No
Color?
Yes No
Clarity?
Yes No
Floatables?
Yes No
Deposits/Stains?
Yes No
Abnormal Vegetation?
Yes No
Conveyance Benthic Growth?
Yes No
Allowables List
ano..uso naes wr raa.rwn,ai.tere, tsseu.o. uo+.t w.ra+ea.row.�we000v�s.r.a.
mrati....raaune.ar.airsc orsrr s�oaaoawewt., aomeaoo am umeaawra sot�.atr
.wa..warm.�a aa`oarrr. rosaaseeoade.r. no+s..r.. sn'cr. raw.a.r.on. tMeo.
r.�.r.oy..raao� n.e.rt ase eases ra.ata`a ta.. ew. re.a.� maaw aa.w.s. aoaaeroroe r...q
boa amr.eoo. wtt wa oorr. aow nw.6oayey aweoa
Is the dry weather discharge identified for further investigation?
Identified for further investigation No follow-up necessary
Comments:
Figure 5 Dry weather discharge screening
The dry weather screening portion of the survey prompts the field team to identify physical
characteristics in the discharge (that deviate from general assumptions about clean water, clear
and free from odor and debris) such as water discoloration, odor, water clarity, presence of
floatables, deposits or stains, abnormal vegetation, and/or benthic growth. Any noticeable
physical characteristic in the discharge should be noted here. This is specifically concerning the
discharge from the outfall, and not the stream as a whole, although some characteristics may
also be observed in the stream. The field team should evaluate the physical characteristics
observed and determine if the discharge requires further investigation.
Determining if a discharge requires further investigation based on physical observations can be
discretionary and is supported by evidential observations. If one or more issues listed in the
Survey123 form are observed, further investigation should be considered. Example photos of
common physical observations are provided in Appendix A.
4.1 Iron Oxidizing Bacteria
Certain bacteria oxidize dissolved iron when deoxygenated water reaches a source of oxygen.
This commonly occurs when ground water meets surface water. The iron oxidation process
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City of Winston-Salem I Dry -Weather Discharge Screening Standard Operating Procedures ���
Outfall Screening
produces an orangish-brown film or plume and often a sheen on the water surface. Example
images are shown in Appendix A.
Iron oxidizing bacteria is listed as a deposit/stain on the dry -weather screening form; it occurs in
streams naturally and is quite common in the City. For this reason, it should not trigger further
investigation on its own. However, if a discharge shows other physical characteristics in addition
to the iron oxidizing bacteria, it should be considered for further investigation.
Two tests are performed when iron oxidizing bacteria are present to confirm that it is naturally
occurring and that any oily sheen present is not petroleum -based.
1. The stick test is performed to determine if a sheen is caused by iron oxidizing bacteria
or petroleum. A stick is used to disturb the water surface. A bacterial sheen will break apart and
fragment while a petroleum sheen will quickly reform after being broken up by the stick due to
the cohesive nature of petroleum.
2. A water quality strip test (Figure 6) is used to determine iron concentration in the
water to ensure that the concentrations are not unnaturally high. A concentration higher than
three parts per million (ppm) is considered harmful to the stream ecosystem and, if found, would
be a cause for further investigation. Water quality strips are submerged in the discharge and
then compared with reference results on the bottle to determine approximate concentrations.
Figure 6 Water quality strip test
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City of Winston-Salem I Dry -Weather Discharge Screening Standard Operating Procedures ���
Follow -Up Investigation
7. Take a picture of the outfall before completing the survey.
a. Photos should show the outfall and some context for the location of the outfall.
b. If discharge is identified for further investigation, make sure to include detailed
photos of the physical characteristics.
c. If the outfall structure is in poor condition, make sure to include photos that
capture the issues with the structure.
d. Provide photo captions if they will help clarify the photo context.
8. At the end of the day or prior to the next day, export reports for discharges that need
further investigation and provide to the office staff team for further review.
5 Follow -Up Investigation
After dry weather screenings have been completed, outfalls with discharges that have been
identified for further investigation will be reviewed. A desktop review performed by office staff
will be used to verify that water quality sampling is necessary. Then, sampling will be used to
determine if a discharge is allowable or illicit.
Allowable stormwater discharges, per the City's MS4 permit, are defined as "incidental non-
stormwater flows that do not significantly impact water quality". Potential allowable discharge
sources are listed in Table 2.
Table 2 Allowable stormwater discharge sources
Allowable Stormwater Discharge Sources
Water line and fire hydrant flushing
Individual, residential, and charity car washing
Landscape irrigation
Flows from riparian habitats and wetlands
Diverted stream flows
Dechlorinated swimming pool discharges
Rising ground waters
Street wash water
Uncontaminated groundwater infiltration
Flows from firefighting activities
Uncontaminated pumped groundwater
Irrigation water
Discharges from uncontaminated potable water sources
Springs
Foundation and footing drain water
Water from crawl space pumps
Air conditioning condensate
Splash pad (spray ground) water from potable
Lawn watering
water source only
1. Office staff review outfall reports submitted for further investigation to determine if follow-
up field investigation is needed.
a. Office staff may eliminate outfalls from follow-up field investigation at this point if
it is deemed unnecessary.
b. If no field investigation is needed, the discharge is considered allowable, and the
screening is complete.
2. If follow-up field investigation is needed, an investigation team will visit the outfall and
perform water quality sampling.
a. Sampling should include the parameters shown in Table 3 at a minimum but may
include others as deemed necessary.
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is

City of Winston-Salem I Dry -Weather Discharge Screening Standard Operating Procedures ���
Enforcement
Table 3 Dry -weather discharge sampling parameters
Parameter
Conductivity
Ammonia
Dissolved Oxygen (DO)
Nitrate
pH
Temperature
Total Dissolved Solids
3. Based on the results of the sampling, the discharge should be determined to be either
illicit or allowable.
a. If the sampled parameters are within acceptable ranges, a fluoride sample
should be collected and analyzed at the City of Winston-Salem's Thomas Water
Treatment Facility.
b. If the fluoride sample results are in the range of potable water, it indicates that
the discharge source could be some of the sources listed in Table 2, which are
allowable.
c. Allowable results need no further investigation, and the effort is complete.
4. If a discharge is determined to be illicit, the investigation team will locate the discharge
source and collect additional information for removal and enforcement proceedings.
5. Record follow-up investigation results and conclusions.
a. Office staff incorporate the data into the AGOL outfall screening tracking
dashboard.
6 Enforcement
After illicit discharges are identified and traced, the sources of the discharges must be
eliminated. The parties responsible for the discharges are notified and enforcement actions
pursuant to the City's IDDE ordinance policies are taken. City staff has the enforcement
authority to issue Notices of Violation (NOV) and to enter private property in these situations.
The City's Stormwater staff perform necessary compliance efforts to complete the dry -
weather discharge investigation.
a. Issue an NOV to any parties responsible for illicit discharges.
b. Coordinate with other utility staff to manage discharges caused by issues like
sewer or water line leaks.
These enforcement actions complete the dry -weather screening process. Results and
conclusions should be properly documented for future screenings.
7 Documentation
Maintaining accurate screening records will allow the data to be referenced during future
screening efforts and manage inspection status throughout the effort. Outfalls with a history of
multiple illicit discharges can be tracked and visited more frequently and compliance can be
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City of Winston-Salem I Dry -Weather Discharge Screening Standard Operating Procedures ���
Procedure Management
confirmed at locations with previous illicit discharges. Data should be stored in both a report
format that can be printed for easy reference and a digital database format.
QA/QC is performed on dry weather discharge investigation statuses to ensure that all
discharges have been successfully investigated and/or resolved.
a. A discharge is labeled as pending if it has been identified for further investigation,
but the investigation is unresolved. An on -going status indicates that an
investigation has been initiated but has not been completed due to insufficient
information. Finally, a discharge can be marked as complete after it has been
determined allowable or an illicit discharge has been resolved.
2. Export Survey123 reports for all outfalls screened at the conclusion of the screening
process.
3. Compile reports into PDF and store for future reference when outfalls are next screened.
4. Export records from the primary AGOL point feature layer to a table with the respective
year and month in which the screenings were completed.
a. This table will be stored in the geodatabase and will serve as a related table to
provide historic data during future screenings.
8 Procedure Management
The standard operating procedures for dry -weather discharge screening, as described above,
should be used to meet the City's MS4 permit requirements. Prioritized stormwater outfalls in
the MS4 will be screened annually using this procedure. However, the procedure should be
routinely evaluated and updated as necessary as changes occur or the City sees fit to adapt the
effort. A revision log is compiled in Appendix B. More frequent investigations or different
screening techniques can be used and may remedy pollutant loadings and protect the
environmental and biological health of the City's surface waters.
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City of Winston-Salem I Dry -Weather Discharge Screening Standard Operating Procedures ���
Procedure Management
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City of Winston-Salem I Dry -Weather Discharge Screening Standard Operating Procedures ���
Appendix A - Photos
Appendix A - Photos

City of Winston-Salem I Dry -Weather Discharge Screening Standard Operating Procedures ���
Appendix A - Photos
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City of Winston-Salem I Dry -Weather Discharge Screening Standard Operating Procedures ���
Appendix A - Photos
Cloudy stream flow
Suds floating on stream surface

City of Winston-Salem I Dry -Weather Discharge Screening Standard Operating Procedures ���
Appendix A - Photos
Green water discoloration
Sewage on water surface

City of Winston-Salem I Dry -Weather Discharge Screening Standard Operating Procedures ���
Appendix B - Revision Log
Appendix B - Revision Log

City of Winston-Salem I Dry -Weather Discharge Screening Standard Operating Procedures
Appendix B - Revision Log
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City of Winston-Salem I Dry -Weather Discharge Screening Standard Operating Procedures
Appendix B - Revision Log

City of Winston-Salem I Dry -Weather Discharge Screening Standard Operating Procedures
Appendix B - Revision Log
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ATTACHMENT D
FY19-20 Master Plan Support Services
February 14, 2022
ADDITIONAL SERVICES
The following are additional services requested by the City of Winston-Salem to the original
scope of services dated November 23, 2020 and incorporated as part of HDR's agreement with
the City dated December 9, 2020.
i ask 200 — Dry Weather Screening
Purpose
HDR will perform dry -weather screening of additional outfalls on prioritized streams within the
City of Winston-Salem.
Sub -Tasks
HDR will perform sub -tasks consistent with the original scope of services except for the
following:
1. HDR will continue collecting outfalls beyond the contracted number (1,085) listed in the
original scope of services dated November 23, 2020. HDR completed the original
amount within budget.
2. Sub -task 7 from the original scope of services has been completed and will not be
performed as part of the additional services.
3. HDR will coordinate with City staff to determine what additional streams should be
prioritized for dry weather screening.
Assumptions
1. All original assumptions remain valid except for the number of outfalls estimated to be dry
weather screened. HDR estimates that an additional 700 outfalls can be dry weather
screened with the remaining budget for a contract total of 1,800 outfalls.
2. HDR will continue to upload completed dry weather screening information to the AGOL
database and use the dashboard for coordinating follow up investigations and final
statusing.
3. HDR will complete dry weather screening in Muddy Creek, Salem Creek, Brushy Fork,
and Peters Creek watershed first. The next stream segments for outfall reconnaissance
includes Lower Silas and Lower Peters Creek watersheds (per the FY2021-2022 Major
SDO and Stream Walking Schedule and included herein). HDR will coordinate with the
City regarding prioritization after these watersheds have been walked in their entirety.
Deliverables
• Dry weather screening geodatabase and reports

FN
Basis of Compensation
HDR will be paid on an hourly basis from the remaining budget in Task 200.
Schedule
HDR will complete the work in 180 calendar days from notice to proceed except in the event
that weather contributes to significant delay. Impactful weather includes high flows and rain
events that prohibit dry weather screening by general practice and safety.
Task 500 — Stream Walks
Purpose
HDR will provide stream walking services to locate potential pollutant sources on TMDL
regulated streams within the City of Winston-Salem.
Sub -Tasks
1. HDR will develop inspection form templates and ArcGIS Online (AGOL) data collection
applications to be used during the field effort.
2. HDR will plan the stream walking field procedure and monitor weather reports prior to
stream inspections.
3. HDR will walk approximately nine (9) miles of streams as identified by City staff and
perform inspections for fecal coliform and sediment sources. Inspection data will be
collected at every possible pollutant source along the stream reaches and include bank
erosion measurements and sanitary sewer pipeline observations.
4. HDR will compile and develop an inspection report for each of the five stream segments
to be walked. A GIS based figure showing the summary of data collected will be
produced for each segment.
5. HDR will compile a shapefile of all of the data points collected during the stream walks
and include the various individual pollutant source inspection forms as attachments to
each point.
6. HDR will develop a standard operating procedures document describing the stream walk
field effort.
Assumptions
1. HDR assumes the project will take 35 days to complete.
2. Stream walking will be performed during periods of dry weather conditions.
Deliverables
• Stream Inspection Reports
• Shapefile of data points with inspection forms included as attachments
• Standard Operating Procedures in Microsoft Word format

• A map (PDF in 8.5" x 11" size) of each stream segment walked, including the total
distance walked (in miles), for the FY 2021-2022 Stormwater Annual Report. Each
map should include the mainstream and tributaries, watershed perimeter, major
streets and highways, and highlighted (in yellow) the actual stream length walked.
Please include a legend and north arrow.
Basis of Compensation
HDR will be paid on an hourly basis for a fee not -to -exceed $16,000 for this task. HDR will
transfer funds in the amount of $16,000 from Task 200 to a new Task 500 for purposes of
tracking hourly services related to this scope of services.
Schedule
HDR will complete the work in 35 calendar days from notice to proceed except in the event that
weather contributes to significant delay. Impactful weather includes high flows and rain events
that affect the water quality of the streams, which is trying to be independently observed.

FY 2021 — 2022 Major SDO Screening (Dry Weather Conditions) and Stream -
Walking
Scheduled for November 2021 to March 2022
Muddy Creek (and contributing tributaries) Watershed for TSS sources:
1) Silas Creek Watershed
a. Segment #1
Start: Silas Creek at Country Club Road (ingress behind Food Lion)
Stop: Silas Creek at Kester Mill Road
Approximate distance to walk: 1.07 miles
b. Segment #2
Start: Silas Creek at Kester Mill Road
Stop: Silas Creek at McGregor Road
Approximate distance to walk: 1.90 miles
2) Muddy Creek Watershed
a. Segment #3
Start: Muddy Creek at Phillips Bridge Road (ingress via a tributary behind
baseball fields)
Stop: Muddy Creek at Peacehaven Road (egress via a tributary on left side,
when facing downstream onto Sedgemont Drive)
Approximate distance to walk: 2.2 miles
b. Segment #4
Start: Muddy Creek at Peacehaven Road (ingress the tributary described above)
Stop: Muddy Creek at S. Stratford Road (egress at the dead end of Wade Frye
Lane)
Approximate distance to walk: 2.4 miles
Salem Creek (and contributing tributaries) Watershed for Fecal Coliforms and TSS
sources:
3) Peters Creek Watershed
a. Segment #5
Start: Peters Creek at Hanes Park
Stop: Peters Creek at Antique Dealership
Approximate distance to walk: 1.75 miles
TOTAL ESTIMATED DISTANCE FOR DRY WEATHER RECONNAISSANCE
ACTIVITIES: 9.32 MILES