20131200 Ver 2_More Info Received_20150105

Strickland, Bev
From:
Lucas, Annette
Sent:
Monday, January 05, 2015 5:18 PM
To:
David Odom
Cc:
Kelly Hefner; Fox, Tim; Chris Waters; Devane, Boyd; Pickle, Ken; William Hunt
(bill_hunt @ncsu.edu); Andrew Anderson (arander5 @ncsu.edu); Strickland, Bev;
Burdette, Jennifer a
Subject:
RE: 13- 1200v2 Tryon Horse Complex
FUMMUMMMIN
That sounds great— I think it will be much better to talk in person. I reserved the 7t" floor conference room in the
Archdale Building. I also reserved parking spaces 103 and 104 in State Parking Lot 25 for your use (free). You can view
the state parking map at: http: / /www.doa.nc.gov /parking /documents /StateParking.pdf.
MIME
From: David Odom [ maiIto :davidodom @odomengineering.com]
Sent: Monday, January 05, 2015 3:29 PM
To: Lucas, Annette
Cc: Kelly Hefner; Fox, Tim; Chris Waters; Devane, Boyd; Pickle, Ken; William Hunt (bill— hunt @ncsu.edu); Andrew
Anderson (arander5 @ncsu.edu); Strickland, Bev; Burdette, Jennifer a
Subject: Re: 13- 1200v2 Tryon Horse Complex
Annette
I thought we had a visit to your office tomorrow. Kelly is on his way and we are headed up tomorrow. I
thought it would be a lot easier to meet in person.
Dave
On Mon, Jan 5, 2015 at 2:41 PM, Lucas, Annette <annette.lucasgncdenr.gov> wrote:
I have a conference call on my calendar from 10 :30 to 11 :30 tomorrow morning to discuss this project. Can someone
provide a conference line for us to call in to? Thank you.
Kelly, it is particularly important that you participate in this call since much of the missing information pertains to the
Isolator Row systems.

I II N 11112 ral TO 19 RVIET3111 8 J0 a
Environmental Engineer
5 12 N. Salisbury St, Raleigh, NC 27604 1 91h Floor (Lo(�a tion & Parc�els)
Phone: [phone] Fax: [phone] Email: [e-mail]
Website. http://portal.ncdenr.org/web/Ir/stormwater
bA, Before printing this email, please consider your budget and. the environment.
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to
third parties.
From: Lucas, Annette
Sent: Thursday, November 13, 2014 11:18 AM
To: Lucas, Annette; David Odom; Kelly Hefner
Cc: Fox, Tim; Chris Waters; Devane, Boyd; Pickle, Ken; William Hunt (bill hunt(a)ncsu.edu); Andrew Anderson
(arancIer5@)ncsu.ecIu); Strickland, Bev; Pickle, Ken; Burclette, Jennifer a
Subject: RE: 13-1200v2 Tryon Horse Complex
PEI

I have reviewed the stormwater submittal received in this office on October 27, 2014
requested in the October 1, 2014 email below were included but some were missing.
out to the owner and agent today.
Some of the items that I
From: Lucas, Annette
Sent: Monday, October 20, 2014 12:59 PM
To: 'David Odonf; 'Kelly Hefner'
Cm: Fox, Tim; 'Chris Waters'; Oevane Boyd; Cranford, Chuck; Pickle, Ken; 'William Hunt '; 'Andrew
Anderson '; Strickland, Bev; Pickle, Ken
Subject: RE: 13-1200v2 Tryon Horse Complex
I am expecting to see a Stormwater Management Plan for the Tryon Horse Complex at some point this week. It is
important that we move forward with this project in light of the 401 Certification and the August 4 2014 NOV, which can
be viewed at: http://its.enr.state.nc.us/WebIink8/0/doc/249547/Page1.asp .
Please include your design information for the Tryon Horse Complex site and the Isolator Row technology together as
single, coordinated package. You should both be familiar with the other's design information.
Please let me know as soon as possible if there is a problem with submitting the stormwater plan this week or if you
have questions.
����

From: Lucas, Annette
Sent: Wednesday, October 01, 2014 12:59 PM
To: 'David Odom'; Clemment Riddle
Cc: Kelly Hefner; Chris Waters; Devane, Boyd; Cranford, Chuck; Pickle, Ken; William Hunt (bill huntCa)ncsu.edu); Andrew
Anderson (arander5Cd)ncsu.edu); Strickland, Bev
Subject: RE: 13- 1200v2 Tryon Horse Complex
rim"', + .
From: David Odom [ mai Ito: davidodom (a)odomenaineerina.com]
Sent: Wednesday, October 01, 2014 12:58 PM
To: Lucas, Annette; Clemment Riddle
Cc: Kelly Hefner; Chris Waters; Devane, Boyd; Cranford, Chuck; Pickle, Ken; William Hunt (bill huntCa)ncsu.edu); Andrew
Anderson (arander5Cd)ncsu.edu); Strickland, Bev
Subject: Re: 13- 1200v2 Tryon Horse Complex
Annette
I would like to see if we could do the call Tuesday at 9 am rather than 10 am if that works for you. See below
for some additional information regrading your comments.
GENERAL OVERVIEW:
. A reminder to everyone that this stormwater plan is to fulfill the requirements of a 401 Certification issued
for this project on February 17, 2014. This certification can be viewed
at: http: / /its.enr. state. nc.us /WebLink8 /DocView.aspx ?id= 217849. My understanding is that there is
currently a Notice of Violation for this project due to use of the facility before the implementation of a
stormwater management plan as well as deposition of sediment into the receiving stream. Perhaps Chuck
Cranford from the Asheville Regional Office can elaborate on this when he returns next week.
. You are also requesting that this project be considered as a submittal to the PEP program.
. This submittal must be sufficient to address the programmatic issues associated with the 401 Certification
program, resolution of the Notice of Violation and the requirements of the PEP.
The site currently is under a Notice of Violation. A response was filed with Chuck August 25th. The sedimentation
cleanup is approximately 75% completely and will be completed later this week or early next week. The site is still
very much a construction site with limited asphalt and grading still active. They did have some shows earlier in July

as an introduction to the project and to meet licensing requirements. It is our expectation that the treatment
systems will be installed immediately upon approval. We are requesting that the project be considered as a
submittal to the PEP program.
PEP REQUIREMENTS:
. Please provide a design narrative that states the design objective, summarizes in words the design
approach, and concludes with the assertion that the design is compliant with the relevant rules?
. Please provide a QAPP for our review and a commitment to stay the course over 12 months of testing.
. Pleae provide an agreement to replace or tweak the Isolator Rows if they don't work to achieve 85% TSS or
an effluent concentration of 20 mg /L or less.
We will provide the additional information requested above in conjunction with ADS.
PLEASE EXPLAIN:
Which portions of the site are already built and which areas are paved versus gravel.
How the Notice of Violation will be resolved and the stream will be restored. It sounds like the
site has caused a significant amount of sediment to be deposited in the stream.
Please also explain how the Isolator Row devices will be protected from sediment after their
installation, particularly the devices that will be located downslope of permanently unvegetated areas
like horse rings and trails.
Which portions of the stormwater plan you are requesting approval for now and which areas will
be designed /built in the future (if any).
I will provide you with a drawing that indicates what is built and where construction is continuing. The NOV is in
the process of being resolved now. The drawing will indicate what we are requesting approval for now and what is
for the future. Additional information will be provided to address your other questions.
CALCULATIONS:

Flow calculations were provided for every catch basin and pipe in the storm drainage network.
However, for every drainage area, C was estimated to be 0.5 and for many inlets, the storm intensity
was given to be 0 inch /hour. Please double- check.
Please provide calculations for the sizing of the Isolator Row systems.
We will review this immediately.
PLANS — PLEASE SHOW:
Drainage easements or deed restrictions for the stormwater control measures.
How the Isolator Row systems will be accessed.
Clear details of the Isolator Row systems, including inlet and outlet details and elevations.
Dimensions, elevations and pipe sizes for every stormwater diversion device that will be used
with supporting calculations.
• A construction sequence.
We wall provide this shortly along with the items below,
MAINTENANCE & MONITORING
Please provide a signed and notarized Operation & Maintenance Agreement for the stormwater
control measures.
Please provide a monitoring plan for one of the Isolator Row systems, including the equipment,
procedures and frequencies for cleaning the devices.
Please provide a signed and notarized agreement stating that the Isolator Row systems will be
replaced with another stormwater control measure if monitoring data show that they are not working
effectively.
On Wed, Oct 1, 2014 at 8:15 AM, Lucas, Annette <annette.lucasgncdenr.gov> wrote:
David, Chris and Kelly,

Ken Pickle and I have reviewed the submittal received in the Division of Water Resources Central Office on September 9,
2014 for the above named project. In our review, we noted the following issues.
GENERAL OVERVIEW:
A reminder to everyone that this stormwater plan is to fulfill the requirements of a 401 Certification issued for
this project on February 17, 2014. This certification can be viewed
at: http: / /its.enr. state. nc.us /WebLink8 /DocView.aspx ?id= 217849. My understanding is that there is currently a
Notice of Violation for this project due to use of the facility before the implementation of a stormwater
management plan as well as deposition of sediment into the receiving stream. Perhaps Chuck Cranford from the
Asheville Regional Office can elaborate on this when he returns next week.
You are also requesting that this project be considered as a submittal to the PEP program.
• This submittal must be sufficient to address the programmatic issues associated with the 401 Certification
program, resolution of the Notice of Violation and the requirements of the PEP.
PEP REQUIREMENTS:
• Please provide a design narrative that states the design objective, summarizes in words the design approach,
and concludes with the assertion that the design is compliant with the relevant rules?
Please provide a QAPP for our review and a commitment to stay the course over 12 months of testing.
• Pleae provide an agreement to replace or tweak the Isolator Rows if they don't work to achieve 85% TSS or an
effluent concentration of 20 mg /L or less.
PLEASE EXPLAIN:
Which portions of the site are already built and which areas are paved versus gravel.
How the Notice of Violation will be resolved and the stream will be restored. It sounds like the site has
caused a significant amount of sediment to be deposited in the stream.
• Please also explain how the Isolator Row devices will be protected from sediment after their installation,
particularly the devices that will be located downslope of permanently unvegetated areas like horse
rings and trails.
• Which portions of the stormwater plan you are requesting approval for now and which areas will be
designed /built in the future (if any).

CALCULATIONS:
• Flow calculations were provided for every catch basin and pipe in the storm drainage network. However,
for every drainage area, C was estimated to be 0.5 and for many inlets, the storm intensity was given to
be 0 inch /hour. Please double- check.
Please provide calculations for the sizing of the Isolator Row systems.
PLANS — PLEASE SHOW:
Drainage easements or deed restrictions for the stormwater control measures.
How the Isolator Row systems will be accessed.
Clear details of the Isolator Row systems, including inlet and outlet details and elevations.
• Dimensions, elevations and pipe sizes for every stormwater diversion device that will be used with
supporting calculations.
• A construction sequence.
MAINTENANCE & MONITORING
• Please provide a signed and notarized Operation & Maintenance Agreement for the stormwater control
measures.
• Please provide a monitoring plan for one of the Isolator Row systems, including the equipment,
procedures and frequencies for cleaning the devices.
• Please provide a signed and notarized agreement stating that the Isolator Row systems will be replaced
with another stormwater control measure if monitoring data show that they are not working effectively.
I suggest we schedule a conference call to discuss these items in more detail. If you are interested in that, please let me
know some dates /times in the next week or so that you will be available.
Thanks,
Annette
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Environmental Engineer
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VIONIMMMI
5 12 N. Salisbury St, Raleigh, NC 27604 1 91h Floor (Loca tion & Parc�els)
Phone: [phone] Fax: [phone] Email: annette.lucasgncdenngov
Website http://portal.ncdenr.org/web/Ir/stormwater
bA, Before printing this email, please consider your budget and. the environment.
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to
third parties.
0

STORMWATER MONITORING OF TWO STORMTECH®
CHAMBER SYSTEMS IN POLK COUNTY, NC
Principal Investigator
William F. Hunt, III, Ph.D, P.E., Professor, Extension Specialist & University Faculty Scholar,
Department of Biological and Agricultural Engineering, North Carolina State University'
Co -Investigator
Andrew R. Anderson, M.S., E.I.T., Extension Associate, Department of Biological and
C16filcul6ulal lillrgln%-,C -Marg, 1-40im t-Zuuiina ululy —11-1—y
PINS number:
Start Date: January 2015
End Date: April 2016
Total Funds Requested: $71,193
Submitted:
'Contact Information: 208 D.S. Weaver Labs, Box 7625, NCSU, Raleigh, NC 27695-7625, (919)
515-6751, bill hunt o ncsu.edu
2Contact Information: 214 D.S. Weaver Labs, Box 7625, NCSU, Raleigh, NC 27695-7625, (919)
515-8595, arander5gncsu.edu

1. Proposal Summary
North Carolina State University will be contracted as a third -party independent researching entity
to evaluate a proprietary underground detention system for hydraulics, hydrology, and water
quality. The stormwater control measure (SCM) will be located at Tryon International Equestrian
Center in Polk County, North Carolina. NC State researchers will evaluate overall sediment,
nitrogen, and phosphorus removal capabilities of the system over the course of 18 storm events. A
final report detailing performance metrics important to the State of North Carolina, as well as the
engineering research field as a whole, will be produced.
2. Project Description
Tasks and Methodolopy
Two StormTech® MC -3500 Chambers, each with Isolator Row® stormwater control measures,
will be monitored. Inflow and outflow hydrology, hydraulics, and water quality data will be
collected from the entire systems. Both sets of MC -3500 chambers will be properly sized for their
respective drainage areas, and thus will have equivalent loading ratios for side-by-side comparison.
The only major difference between the two systems will be the varying soil types beneath each
system, which typically consists of 9" of aggregate.
While the site has numerous chamber systems, monitoring will only be done for beds 2 and 4. The
schematics of the monitoring schemes for the two systems on the site are shown in Figure 1 and
Figure 2, respectively. System inflow will be monitored using ISCO 6712 automated portable
samplers and area -velocity ISCO 750 modules for each Bed. The collected water will be monitored
for flow and water quality once the underdrain exits the system and ties into a junction box.
Outflow from each system will be measured with ISCO 750 area -velocity modules or weirs built
into the outflow pipe. Rainfall will be collected at the site using a 0.01 -inch resolution tipping
bucket rain gauge, which will be connected to an ISCO 6712 sampler on site. If the sites are more
than 0.25 miles apart, two rain gauges will be used. Table 1 summarizes the equipment needed for
the study. The numbers may vary based on feasibility to install either an area -velocity meter, or use
a weir with a HOBO level logger instead.

Table 1. Summary of monitoring equipment for NCSU evaluation
Item
Qty
ISCO 6712 Automated Sampler
4
ISCO 750 area -velocity module
2-4
V -notch weir plates
2
Tipping -bucket style rain gage (Davis Instruments)
1-2
Boxes to securely house monitoring equipment (constructed in-house)
2
HOBO Water Level Loggers
17-20
Continuous temperature sensors
4
Additionally, water level in each chamber will be monitored by HOBO level loggers contained
within installed perforated 4" -diameter PVC piezometers (see Figure 1 and Figure 2 for specific
placement.) Six of the wells will be placed roughly 10 feet below the aggregate -in-situ soil
interface to measure water table response to the systems. These wells will monitor the shallow
groundwater table, and be able to quantify any effect the detention system has on local
groundwater mounding. The two "deep" piezometers that flank each system will be at least 30 feet
from the edge of the system to capture effects of the mound at a distance from the storage vaults
themselves. For the purpose of water level monitoring (not in combination with weirs), 16 water
level loggers are recommended, with one additional logger used to measure atmospheric pressure
for calibration purposes (making 17 total). As seen in Table 1, additional loggers may be needed
based on a site evaluation by NC State researchers if an area -velocity meter is not feasible. Finally,
temperature of the stormwater will be logged continuously at both inlet and outlet for each bed
system.
After construction, approximately one year will be allocated to monitoring the performance of both
systems. Four different points on the site will be monitored for various pollutants. These include:
• Before flow enters Bed 2
• After flow leaves Bed 2
• Before flow enters Bed 4
0 After flow leaves Bed 4

Flow -proportional water quality samples will be collected at each ISCO sampler within 48 hours
after a rain event. Local extension personnel may be able to assist in sample collection and
shipment of samples to Raleigh, North Carolina. Samples will be analyzed at an EPA -certified lab
located on campus (North Carolina Center for Applied Aquatic Ecology Laboratory). The
following constituents will be analyzed per storm event per monitoring site, with an objective
number of sampled storms set at 18 with even seasonal distribution:
• Sediment (Total Suspended Solids)
• Total Ammoniacal Nitrogen
• Total Kjeldahl Nitrogen
• Nitrate/Nitrite-Nitrogen
• Total Phosphorus
• Orthophosphate -Phosphorus
From this information, researchers will also be able to calculate Total Nitrogen, Organic Nitrogen,
and Particulate -bound Phosphorus. Sample labels will be properly attached to every sample
container. Sample labels will show clearly the following data:
• Site name and project number
• Sample identification number (event number)
• Date and time sample was collected
• Sample preservation method
• Analysis requested
• Sampling location on the site
Samples will be considered "under custody" when it is:
• In the sample holder's physical possession
• Is in view by the sample holder
• Secured by the sample holder to prevent tampering
Samples will be housed in the ISCO 6712 sampler for no more than 24 hours until such time when
a sampling monitor can pick them up and deliver them to the lab under cool (4 degrees C or less)
conditions.

Data Evaluation
Summary data will be calculated for each pollutant measured over the 18 storm events within the
context of the individual rainfall and flow events measured. The data will be analyzed using a
range of performance indicators:
• Percent concentration reduction per pollutant
• Percent and mass load reduced per pollutant
• Evaluation of rainfall -runoff characteristics
• Effluent probability analysis
• Evaluation of infiltration characteristics and associated influence on local water table.
• Change in temperature of stormwater entering vs. leaving the systems
Based on percent load and concentration reductions of various pollutants, as well as effluent
concentrations, the manufacturer will seek from NCDENR an approval as a BMP that meets state
water quality standards (85% TSS), as well as receives credit for nitrogen and phosphorus if the
data suggest that is appropriate.
Required Action Items to Enable NC State Monitoring
1. Install maintenance ports in locations marked for PVC water level logging on schematics. For
locations that monitor groundwater ("deep" wells), a boring core 10 feet below excavation
grade is proposed. For shallow monitoring wells (monitors water level within the stone and
chamber systems), bore approximately 1 foot below excavation grade to allow sump conditions
for PVC pipe. For the parts of each pipe buried by in-situ soil, that part does not need to be
perforated. Each PVC pipe should be perforated to the in-situ soil interface, and should be
fitted with silt sock around the perforations to prevent the well from accumulating sediment.
2. Inverts of pipes entering the bypass junction box, and pipes entering the Isolator Row® must
have elevations (above the invert/sump) such that backwater is minimized.
3. Elevation of bypass weir should be high enough to avoid significant backwater, but not at the
elevation of the top of the Isolator Row® so as to cause pressurized flow across the filter
fabric.
4. Installation of inspection ports or monument boxes for each HOBO water level logger.
5. Manhole or grate access to each diversion structure in which monitoring equipment will have
to be located.

Of course, NC State faculty are happy to work hand-in-hand with the designer/ vendor to ensure
monitorability of the StormTechR system. Please contact Andrew Anderson for further questions
on experimental design (arander5(ancsu.edu or 919-515-8595).
Expected Deliverables
North Carolina State University researchers expect to produce the following deliverables:
1. A final report detailing the water quality and hydrologic performance of two StormTech
MC -3500 chamber beds and Isolator RowsR (Please allow up to two months post -data
collection for analysis and report writing)
2. Statistical comparison of two systems over potentially different soil types.
3. Mini -report on observed effects on localized groundwater table from the StormTechR
systems.
4. At least one presentation at a national/ international engineering conference.

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3. Budget & Budget Justification
REMOVED FOR PRIVACY REASONS
4. Timeline
January, 2015— Grant Awarded
January 31, 2015 — Monitoring Equipment Installed — Monitoring Commences
August 1, 2015 — Mid-term Update (short written)
January 31, 2016 — Monitoring Complete
April 16, 2016 — Monitoring Report Submitted. Project Complete.

5. References
Roseen, R.M., Houle, J.J., Puls, T.A., and Ballestero, T.P. (2010). "Performance evaluation report
of the StormTech Isolator Row® treatment unit." Submitted to StormTech, LLC.
University of New Hampshire Stormwater Center. pp. 1-49.