SW3191205_Stormwater Infilltration Report_2/11/2020

Rusty O'Neill
From: Anen, Steven C <[e-mail]>
Sent: Friday, July 27, 2018 11:36 AM
To: Justin Cobb
Cc: Rusty O'Neill; Tim Foley
Subject: RE: [External] 217053 - Windsong Subdivision - off Hwy 218 - Union County, Goose
Creek
Hi Justin,
Sorry for taking so long to get back to you. I was out sick for a while and I'm just getting caught up on everything. Based
on those Ksats I would say that designing an infiltration system wouldn't be practical. Sand filters and wet ponds would
be ok. Unless it's not possible, it would be best to design the sand filters and wet ponds without an impermeable liner to
promote what little infiltration can be achieved, although I understand this may not be possible with wet ponds if you're
concerned about the water budget. My other suggestion would be to consider using bioretention cells. They're more
aesthetically pleasing than sand filters and can achieve all the same objectives.
Feel free to get in touch with me with any other questions. I apologize for missing your last two calls, but I should be in
the office from around 1:30-5 today. Note that my phone number has changed. The one in my signature is the correct
one.
Corey Anen
Environmental Engineer
North Carolina Department of Environmental Quality
Division of Energy, Mineral & Land Resources Stormwater Program
512 N. Salisbury Street
1612 Mail Service Center
Raleigh, NC 27699-1612
919-707-3649
[e-mail]
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Justin Cobb [mailto:[e-mail]]
Sent: Friday, July 13, 2018 11:13 AM
To: Anen, Steven C <[e-mail]>
Cc: Rusty O'Neill <[e-mail]>; Tim Foley <[e-mail]>
Subject: RE: [External] 217053 - Windsong Subdivision - off Hwy 218 - Union County, Goose Creek
Corey,
I apologize for the delay with this but we have been trying to work out options with the developer. We are also having to
coordinate the BMP locations around septic field locations to promote optimal house sizes for each lot.

We have been working with a soil scientist as a septic and infiltration consultant and he ran a few soil tests on site to see
if we can achieve infiltration. We assumed an average of 3' of head could be provided and based on the drawdown time
off of the 72 hr time requirement from the state manual, thus giving us a required rate below 0.5 in/hr or 1.27 cm/hr.
Comparing his flow numbers with the 3 ft of head, we would have drawdown rates of about 9 days for location A and 16
days for location K. Would this suffice as enough evidence to say infiltration cannot be achieved? During the Ksat tests
he also ran into rock on each test.
I think that this would bring us back to using the sand filters with an underdrain system to control the discharge rate.
The developer would prefer wetponds so we may need to propose a hybrid system with both, we just have concerns if
the drainage would be enough to keep the permanent pond elevation in the ponds (we also do not know the water
table height at this time). Would it be possible to provide this system and control the discharge rate to predevelopment
to meet the state standards?
Attached is a copy of the report from the soil scientist and the location of the proposed BMPs we have been discussing
with the developer. The soil tests were taken at locations A and K. Thank you for your help with this.
Justin Cobb, E.LT
Out of office July 16 — 20.
HensonFoley
nn&ame rlrchi hire I C%M Englr:,--rirg 13ur++94"}g
Corporate Office:
Birkdale Village
8712 Lindholm Dr.
Suite 202A
Huntersville, NC 28078
o: 704.875.1615
c: 704.898.2450
f: 704.875.0959
www.hensonfoley.com
From: Anen, Steven C [mailto:[e-mail]]
Sent: Friday, June 22, 2018 2:34 PM
To: Justin Cobb <[e-mail]>; Tim Foley <[e-mail]>
Cc: Rusty O'Neill <[e-mail]>
Subject: RE: [External] 217053 - Windsong Subdivision - off Hwy 218 - Union County, Goose Creek
Justin and Tim,
I spoke to some of my colleagues about this project this morning. The rules require the use of infiltration unless it can be
proven that it is not a viable option. That would require the use of an infiltration system, permeable pavement, or a
bioretention system. A geotechnical investigation would be needed to show that either the seasonal high water table is
too close to the ground surface or the hydraulic conductivity of the soils is too low. If it is shown that infiltration is not
possible, wet ponds are acceptable. Treatment swales can be used on low density projects, but because this project falls
under the Goose Creek rules, low density is not an option. We still recommend using vegetated swales as a conveyance

system as they provide extra infiltration and treatment, but they can't alone be used to meet the Goose Creek
requirements.
The stormwater rules were updated to remove the 85% TSS removal requirement and it was replaced with the
requirement to treat runoff using one of the systems we consider "primary SCMs". The manual was updated to reflect
this change, but the Goose Creek rules have not been changed. We would consider the use of any primary SCM to meet
the 85% requirement. Primary SCMs are wet ponds, stormwater wetlands, infiltration systems, sand filters, bioretention
systems, permeable pavement, green roofs, and rainwater harvesting.
Let me know if you have any further questions.
Corey Anen
Environmental Engineer
North Carolina Department of Environmental Quality
Division of Energy, Mineral & Land Resources Stormwater Program
512 N. Salisbury Street
1612 Mail Service Center
Raleigh, NC 27699-1612
919-807-6378
[e-mail]
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Justin Cobb [mailto:[e-mail]]
Sent: Friday, June 22, 2018 2:15 PM
To: Tim Foley <[e-mail]>; Anen, Steven C <[e-mail]>
Cc: Rusty O'Neill <[e-mail]>
Subject: RE: [External] 217053 - Windsong Subdivision - off Hwy 218 - Union County, Goose Creek
Corey,
We met with the client in regards to the Windsong Subdivision and they are completely against the use of sand filters, so
we having to scratch that idea completely. They would prefer wet ponds on site. If I am reading the code correctly, wet
ponds are acceptable as long as infiltration cannot be achieved and assuming we can reach the groundwater table,
correct?
I know that the code says we also need to achieve 85 % TSS removal. The new BMP manual from the state does not list
the TSS Removal rates for each BMP, but according to the older version, wet ponds did provided the 85 %. I think that
dry ponds did not unless you had 3 in series together.
You had also mentioned to Tim the use of the treatment swales. I do not have much knowledge of these, would they
have to be used in conjunction with other BMPs to meet the discharge requirements? Also, of infiltration cannot be
achieved, would they even be useful?
Thank you for your help with this,
Justin Cobb, E.LT

HensonFoley
. : ... . . -i.1re I Civ:. Englrsearr,�; I ig
Corporate Office:
Birkdale Village
8712 Lindholm Dr.
Suite 202A
Huntersville, NC 28078
o: 704.875.1615
c: 704.898.2450
f: 704.875.0959
www.hensonfoley.com
From: Tim Foley
Sent: Monday, June 11, 2018 9:00 AM
To: Anen, Steven C <[e-mail]>
Cc: Justin Cobb <[e-mail]>
Subject: RE: [External] 217053 - Windsong Subdivision - off Hwy 218 - Union County, Goose Creek
Corey,
Thanks for the feedback. From my understanding the soils are marginal. The septic soils guy is doing some sort of
special systems from what I understand. I will ask him about that.
Would a sand filter with an IWS type elbows in the underdrain pipe to promote whatever infiltration we can get be an
option?
Thanks
Out of Office, June 17 to June 23
Tim Foley, P.E.
HensonFoley
n dEzace rlrchit Iiire I Ci%R Englr:,--rirg 134iN, ?wing
Corporate Office:
Birkdale Village
8712 Lindholm Dr.
Suite 202A
Huntersville, NC 28078
o: 704.875.1615
4

d: 704.464.4461
c: 704.607.4661
f: 704.875.0959
www.hensonfolev.com
From: Anen, Steven C [mailto:[e-mail]]
Sent: Friday, June 8, 2018 3:00 PM
To: Tim Foley <[e-mail]>
Cc: Justin Cobb <[e-mail]>
Subject: RE: [External] 217053 - Windsong Subdivision - off Hwy 218 - Union County, Goose Creek
Tim,
The only immediate concern I have is that the Goose Creek Rules require infiltration of stormwater whenever possible.
See the exact language from 15A NCAC 026 .0602 below:
"Development and redevelopment shall implement stormwater management measures that promote infiltration of flows
and groundwater recharge for the purpose of maintaining stream base flow or the delegated local government shall
maintain a written explanation when it is not practical to use infiltration methods."
Therefore, sand filters wouldn't be acceptable unless soil testing showed that it was impossible to infiltrate due to low
hydraulic conductivities, a high water table, or risk of damaging nearby structures. Another thing that might be an issue
is that the rules require the removal of 85% TSS. I know that this used to be in the stormwater rules, but it was changed
some time before I started working in North Carolina. I'm not sure what this would require, so I'll look into it and follow
up with you when I have more info. We've been very short staffed this week and at the moment there's no one available
that I can ask about it. I just wanted to make sure I got back to you by the end of the week.
Regards,
Corey Anen
Environmental Engineer
North Carolina Department of Environmental Quality
Division of Energy, Mineral & Land Resources Stormwater Program
512 N. Salisbury Street
1612 Mail Service Center
Raleigh, NC 27699-1612
919-807-6378
[e-mail]
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Tim Foley [mailto:[e-mail]]
Sent: Monday, June 4, 2018 5:26 PM
To: Anen, Steven C <[e-mail]>
Cc: Justin Cobb <[e-mail]>
Subject: RE: [External] 217053 - Windsong Subdivision - off Hwy 218 - Union County, Goose Creek

Corey,
We have been working through conceptual plan and sizing for sand filters on this project. I wanted to run it by you to
get any points you see right away we are missing.
We have drainage area table and sizing information on the table at top of page.
Really appreciate the feedback.
Thanks.
Out of Office, June 17 to June 23
Tim Foley, P.E.
HensonFoley
I and, : --: - - , , : - . :-.:: . . ,
Corporate Office:
Birkdale Village
8712 Lindholm Dr.
Suite 202A
Huntersville, NC 28078
o: 704.875.1615
d: 704.464.4461
c: 704.607.4661
f: 704.875.0959
www.hensonfoley.com
From: Anen, Steven C [mailto:[e-mail]]
Sent: Friday, May 25, 2018 12:58 PM
To: Tim Foley <[e-mail]>
Subject: RE: [External] 217053 - Windsong Subdivision - off Hwy 218 - Union County, Goose Creek
Tim,
A coworker of mine pointed out that because the project is in the Goose Creek watershed, it will have to meet the
stormwater requirements in the Goose Creek Rules (15A NCAC 02B .0602). All projects disturbing one or more acres are
required to treat the difference in stormwater runoff from predevelopment to post -development for the one-year, 24-
hour storm using structural controls and must use stormwater management measures that promote infiltration.
Unfortunately this will prohibit you from going the low -density rout. You may be able to design the back lots with small,
dispersed infiltration trenches or rain gardens to compensate for the grading.

I suggest you read over the rules and then contact me if you have any questions. The complete text of those rules can be
found here.
Corey Anen
Environmental Engineer
North Carolina Department of Environmental Quality
Division of Energy, Mineral & Land Resources Stormwater Program
512 N. Salisbury Street
1612 Mail Service Center
Raleigh, NC 27699-1612
919-807-6378
[e-mail]
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Tim Foley [mailto:[e-mail]]
Sent: Friday, May 25, 2018 12:04 PM
To: Anen, Steven C <[e-mail]>
Subject: [External] 217053 - Windsong Subdivision - off Hwy 218 - Union County, Goose Creek
Corey,
I felt too bad to call you again and keep bothering you. But it looks like my classification is C. So low density with 24%
appears to be an option. It would require us to switch to ditch section roads, but probably solves the challenge I was
contemplating earlier. Am I missing something?
With a 53.698 Acre site, after I subtract for roads, leaves me about 14,000 sq. ft. of BUA per lot on my 34 lots. Seems
doable.
Only thing I am trying to verify is if there is any other requirement preventing us from doing that.
On NC Surface Water Classification GIS, Looks like class C.

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Corporate Office:
Birkdale Village
8712 Lindholm Dr.
Suite 202A
Huntersville, NC 28078
o: 704.875.1615
d: 704.464.4461
c: 704.607.4661
f: 704.875.0959
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July 12, 2018
Henson Foley
Mr. Rusty O'Neal
Birkdale Village
8712 Lindholm Dr., Suite 202A
Huntersville, NC 28078
Reference: SOIL AND SITE EVALUATION AND HYDRAULIC CONDUCTIVITY FOR
SAND FILTERS/WET PONDS
Windsong Subdivision
Union County, North Carolina
Dear Mr. O'Neal
Septic Environmental Solutions, Inc. has completed the requisite soil and site evaluation
including hydraulic conductivity testing at the locations of two proposed wet ponds (Area A
and K) and nine proposed sand filters (Areas B, C, D, E, F, G, H, I and J) at the future Windsong
Subdivision in Union County, North Carolina (Figure 1). The soil profiles were prepared in
general accordance with the methods and terminology specified in the Field Book for
Describing and Sampling Soils including soil properties such as texture; consistency,
approximate soil horizon thickness, depth to seasonal high water table or weathered
bedrock and the presence of restrictive horizons.
Soil profiles indicated and average depth to bedrock in the proposed sand filter areas, B, C, D, E,
F. G. H. I and J of 21-inches, 18-inches. 32.5-inches, 15.75-inches. 19-inches, 48-inches, 19-
inches, 24-inches and 31.7-inches, respectively. Based on the topographic slope in these areas of
the site, bedrock wi[I be encountered during the construction of the proposed sand filters.
The in -situ saturated hydraulic conductivity (Ksat) testing was conducted in the proposed
areas of the wet ponds (Areas A and K). These tests were conducted in general accordance
with the procedures outlined in the North Carolina Department of Health and Human
Services Division of Public Health guidance document dated August 19, 2014. Septic

Environmental Solutions, Inc. utilized Compact Constant Head Permeameter (CCHP)
equipment developed by Dr. Amoozegar from Raleigh, North Carolina to measure (Ksat)
values for the unsaturated (vadose) zone. The CCHP equipment was augmented with
Onset® HoBo® U20L Water Level Data Loggers. HOBO U20L-004 water level data logger
accuracy is reported as ±0.1% of full scale (FS).
The Ksat LTAR for Wet Pond were 2.29, 0.78 and 1.76 gallon per day per square foot
(GPD/SF). The average LTAR for Ksat results for Area A was 1.61GPD/SF. The Ksat LTAR
for Wet Pond K were 1.80, 3.64 and 3.82 gallon per day per square foot (GPD/SF). The
average LTAR for Ksat results for Area A was 3.087 GPD/SF. See Appendix A Ksat data and
graphs for each bore hole test.
As previously discussed, Ksat tests have limitations that should be considered when
determining a the wet pond design. A Ksat value measured in the field represents a value for a
specific time and location within the tested soil, but it might not represent the hydraulic
characteristics and soil properties across an entire site.
During each Ksat test, the flow rate into the hole might not be absolutely constant even after
reaching steady state conditions. A steady state of flow is reached when the change in volume
of water entering the soil from the permeameter is insignificant or is nearly the same between
interval measurements. Most soils contain varying aggregate and pore structures and voids
which will cause water to move at different rates. The water flow rate is often essentially
constant after reaching steady state conditions with a uniform sand, but it might show minor
variation in clayey soils and saprolite (former bedrock that has the same layering and volume
but none of the cementations of the original bedrock).
This opinion report may be relied upon by our client in connection with and for the
purposes set forth herein and may not be used or relied upon by any other person, firm, or
entity for any purpose whatsoever than in connection with regulatory requirements or in
response to a court order without, in each instance, the written consent of the undersigned.
Independent conclusions, opinions and recommendations made by others based on the field
data are not the responsibility of the undersigned.

Septic Environmental Solutions, Inc. appreciates this opportunity to assist you with this
project. If you should have any questions concerning this report, or need further assistance,
call [phone].
Sincerely,
I(eptic Environmental Solutions, Inc.
Kenneth L. Owens, President
Principle Soil Scientist
Licensed Soil Scientist #1134

Reference:
I. Amoozegar, A. Compact Constant Head Permeameter User's Manual. Ksat, Inc.
2. Onset® HoBo® Manufacture, Bourne Massachusetts.
3. Fluke 62 Mini Infrared Thermometer.
4. United States Department of Agriculture (USDA) -Soil Conservation Service (SCS) for
Union County, 1996.
S. USDA/NRCS Field Book for Describing and Sampling Soils, Version 2.0, 2002
6. Munsell Soil Color Charts, 2000 by Gretag Macbeth
7. North Carolina Department of Health and Human Services Division of Public Health
recommended guidance for IN -SITU measurements of saturated Hydraulic
Conductivity by the constant head well permeameter method and for for reporting
results dated August 19, 2014.
S. Tyler, E.J., Hydraulic Wastewater Loading Rates to Soils. inX Mancel (ed.) On -site
wastewater treatment. Proc. Of the 9th International Symposium on Individual and
Small Community Sewage System. ASAE. St. Joseph, MI. P.80-86.

APPENDIX A
(H YDRA UL IC COND UC TI VI T Y (KSA T) DATA)

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APPENDIX B
(HYDRAULIC CONDUCTIVITY (KSAT) GRAPHS)

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