MCS000482_IDDE scope Richardson Watershed_20220525

Hazen
March 8, 2022
Hazen and Sawyer
9101 Southern Pine Blvd, Suite 250
Charlotte, NC 28273 • 704.357.3150
Chris Costner, P.E., CSM
City of Monroe - Stormwater Engineer
300 West Crowell Street
Monroe, NC 28112
Re: Richardson Creek, East Fork -Twelve Mile Creek, and South Fork -Crooked Creek — Illicit
Discharge Detection and Outfall Identification — Scope of Services and Effort Estimate
Dear Mr. Costner:
Attached please find our proposed scope of services and effort estimate to perform Illicit Discharge
Detection and Outfall Identification for the Richardson Creek watershed and portions of the East Fork -
Twelve Mile Creek and South Fork -Crooked Creek watersheds in the City of Monroe, North Carolina.
Specially, our proposed scope of series includes stream walks, outfall identification and location, and
dry weather flow identification and sampling for the Richardson Creek, East Fork -Twelve Mile Creek
and South Fork -Crooked Creek Waters of the State with the City of Monroe, NC jurisdiction. The
limits of the Waters of the State are illustrated in the attached figure of the attached scope of services.
Thank you for the opportunity to provide professional services to the Monroe, NC community.
Please contact us at 704-357-3150 or ssands(cr�,hazenandsawyer.com if you would like to discuss the
proposed contract amendment in more detail. We appreciate the opportunity to provide engineering
services for the City of Monroe.
Respectfully Submitted,
Stephen Sands, PE
Senior Associate
hazenandsawyer.com

Hazen
Introduction
The City of Monroe is required to comply with the National Pollutant Discharge Elimination System
(NPDES) Phase II Stormwater Regulations. The City's current NPDES Phase II Stormwater Permit
became effective in October 2015 under which the City of Monroe is authorized to discharge
stormwater from the City's Municipal Separate Stormwater Sewer System (MS4) located within the
corporate limits. The NPDES permit includes six minimum control measures to control the discharge
of pollutants from the municipal storm sewer system. The six minimum measures include public
education and outreach, public involvement and participation, illicit discharge detection and
elimination, construction site runoff controls, post -construction site runoff controls, and pollution
prevention and good housekeeping of municipal operations. Requirements for the Illicit Discharge
Detection and Elimination minimum measure is presented in section D of the NPDES permit which
contains the following language.
Section D — Illicit Discharge Detection and Elimination includes the following elements:
a. Implement and enforce a program to detect and eliminate illicit discharges into the MS4.
b. Maintain a storm sewer system map, showing the location of all major outfalls and the names
and location of all waters of the United States that receive discharges from those outfalls;
c. Prohibit, through ordinance, or other regulatory mechanism, non -storm water discharges except
as allowed in this permit and implement appropriate enforcement procedures and actions;
d. Implement a plan to detect and address non -storm water discharges, including illegal dumping,
to the MS4;
e. Inform public employees, businesses, and the general public of hazards associated with illegal
discharges and improper disposal of waste; and
f. Address the following categories of non -storm water discharges or flows (i.e., illicit discharges)
only if you identify them as significant contributors of pollutants to the MS4: water line
flushing, landscape irrigation, diverted stream flows, rising ground waters, uncontaminated
ground water infiltration, uncontaminated pumped ground water, discharges from potable water
sources, foundation drains, air conditioning condensation, irrigation water, springs, water from
crawl space pumps, footing drains, lawn watering, individual residential car washing, charity
car washes, flows from riparian habitats and wetlands, dechlorinated swimming pool
discharges, and street wash water (discharges or flows from firefighting activities are excluded
from the effective prohibition against non -storm -water and need only be addressed where they
are identified as significant sources of pollutants to waters of the United States).
Task Approach
Stream walk and observations
All stream walks and associated task efforts will comply with the procedures and methods described in
the Illicit Discharge Detection and Elimination — A Guidance Manual for Program Development and
Technical Assessments published by the Center for Watershed Protection. A two -person crew will
perform each stream walk. The following equipment will be used on stream walks:
• Camera • Tablet — GPS data collector
• Backpack • Temperature probe
• pH and conductivity probe • Measuring tape
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• Gloves • Waders
• Flashlight • Waterproof notepad and markers
• Spray paint
The stream walk process will include traveling by vehicle from site to site along a stretch of stream.
Stream access is anticipated to be located near road crossings and other areas that provide easy and
quick access. The stream reach walk is initiated at the most upstream site and moves progressively
downstream without interruption until the entire run is complete. By working downstream, it is possible
to observe slight changes in the physical characteristics of the water that indicate a possible pollution
problem. For example, the water may appear cloudy or an increase in algae content may be observed.
Pictures are collected for any of the following observations. Stream systems that are impassable due
to deep water, fences, dogs, property owners, or other conditions will be bypassed and labelled. One
subsequent field visit will re -assess and attempt to walk the impassable stream segments. The reach
walk is performed during base flow conditions, which is at a minimum of 72 hours following any
measurable rainfall. Longer durations may be required for larger rain events. At each investigation
site, physical observations are made and recorded in a hand-held Tablet.
The following field observations will be recorded during the stream walk:
• Un-identified pipes entering the stream.
• Broken sewer line (immediate notification to the city if discovered).
• Waters with a discoloration or oily sheen.
• Debris in surface waters such as pieces of toilet paper and other solids from a sewer (immediate
notification to the city if discovered).
• Unusual odors.
• Steam coming from a storm drain.
• Soap suds.
• Dead fish or other aquatic life.
• Unusually rapid vegetative growth and/or dead vegetation.
• Algae blooms.
• Overflowing sewer manholes or sewer debris around a manhole.
The stream walk length is anticipated to include the systems highlighted on the attached map
(Richardson Creek, East Fork -Twelve Mile Creek, and South Fork -Crooked Creek and the surrounding
tributaries). Total stream walk length is computed to be 35 miles. Based on an average stream walk
pace of two (2) miles per day, we estimate that a total of eighteen (18) stream walk days are required.
Outfall location
All stormwater pipes larger than 12-inches in diameter shall be horizontally located with a GPS unit
(plus or minus one meter). Vertical data will be not collected. A Tablet which includes a GPS unit and
the ArcMap software is used with GIS background coverages (aerial photogrammetry, sanitary sewer,
road centerline, etc.). The GIS background coverages are used to validate the stormwater outfall
locations by cross-referencing with surrounding land features, roadways, topographic features, land use
changes, stream meanders, sanitary sewer systems, etc. Five digital photographs shall be collected at
each outfall (pipe condition of the outfall using a flashlight, outfall details, outfall relative to
surrounding features, upstream stream view, and downstream stream view.
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Ay Weather Flow Assessment
Any discharge from an outfall shall be observed and recorded. Data recorded shall include temperature,
pH, conductivity (surrogate for TSS), and approximate flow depth.
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Deliverables of the effort shall include:
• Five to ten -page memorandum summarizing the stream walk and dry weather flow
identification approach;
• GIS shapefile of all located outfalls.
• Dry weather flow results georeferenced to GIS outfall shapefile.
Schedule
We will complete the stream walk, outfall location, dry weather flow assessment within three months
of notice to proceed. The proposed schedule includes estimates associated with typical winter rainfall
patterns and required 72-hour wait times after significant rainfall events.
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Task No. (Description
City of Monroe, NC
Illicit Discharge Detection and Elimination
Projected Manhours and Associated Fee
2/28/2022
VP Sr. Assoc. Associate
(Hrs) (Hrs) (Hrs)
$255 $220 $175
Asst Eng Technician Admin Total Total
(Hrs) (Hrs) (Hrs) Labor Hrs Fee
$115 $100 $70 (Hrs) ($)
Monthly Meetings and Minutes 1 12.0 9.0 1 21.0 $3,675.00
Prooress Reports 2.0 1 4.0 3.0 1 9.0 $1,600.00
Subtotal
2.0
16.0
0.0
9.0
0.0
3.0
30.0
$5,275.00
2
Field Data Collection
Data Collection Plan
4.0
1.0
1.0
6.0
$1,095.00
Data Collection Training and Pilot Test
1.0
4.0
4.0
9.0
$1,080.00
Data Collection
8.0
144.0
144.0
296.0
$32,720.00
Data Collection - Contingency
4.0
32.0
32.0
68.0
$7,760.00
Independent QA/QC
2.0
2.0
8.0
2.0
2.0
16.0
$2,780.00
Subtotal
2.0
19.0
8.0
183.0
183.0
0.0
395.0
$45,435.00
3
Deliverables
Letter Report
8.0
8.0
8.0
24.0
$3,480.00
GIS Compilation
2.0
8.0
8.0
8.0
26.0
$3,560.00
Subtotal
0.0
10.0
8.0
16.0
16.0
0.0
50.0
$7,040.00
4
Expenses
Mileage
$400.00
Misc. Supplies
$500.00
Subtotal
GRAND TOTAL
4.0
45.0
16.0
208.0
199.0
3.0
475.0
$57,750.00
$1,020
$9,900
$2,800
$23,920
$19,900
$210
$57,750