WQ0044733_More Information (Received)_20240408

7/ 19/2023
Carpenter Companies
PO Box 891
Morrisville, NC, 27560
PIEDMONT
ENVIRONMENTAL
A 5 5 0 G I AT E 5, P. A.
Project 3310
Soils Report for Proposed Residential Surface Spray Wastewater Irrigation System
Project Name: Marthas Vineyard, Lot IA
Location: Martha's Vineyard Way, Apex, Chatham, PIN: 0019629 (Approx. 7 acres)
A detailed soil evaluation on the above referenced tract was conducted to determine
suitability for a subsurface or surface wastewater system. This report is being prepared to
satisfy the requirements set forth by 15A NCAC 02T.0600 concerning the soils report for
single family surface wastewater systems since this property does not contain enough
suitable soils to support a 4-bedroom subsurface septic system. The location and
characteristics of a site that is potentially useable for a surface drip irrigation wastewater
system was identified. This report details our findings and provides the necessary
soil/site information needed for a surface irrigation system to be designed by a
professional engineer. This fieldwork was completed in January, 2022.
The potentially useable soil area was located in the field and is shown on the
accompanying soils map (Attachment 1). The proposed disposal area is compliant with
buffers for surface wastewater systems. The map also shows the locations where
measurements of saturated hydraulic conductivity (Ksat) were performed.
This site is located in the "Triassic Basin" geologic unit of Chatham County. Upland
soils on the site are generally similar to the Creedmoor-Green Level Complex soil series.
These soils have expansive clay mineralogy and may have indications of soil wetness
present in the subsurface horizons. These types of soils are generally unsuitable for
conventional subsurface septic systems. However, the favorable soil characteristics of
the surface horizons offer the opportunity for surface application of treated wastewater.
Soil Evaluation
The soil condition of the proposed wastewater area is described with the borings shown
on the attached soils map, as well as in the accompanying Ksat location soil profile
descriptions (Attachment 2).
216 S. Swing Rd., Suite 1 • Greensboro, NC 27409 • 336-662-5487

The landscape position for the proposed irrigation field is on a broad side slope with a
sandy loam A horizon. We recommend a maximum instantaneous irrigation rate of no
greater than 0.2 in/hr for design purposes. Measurements of saturated hydraulic
conductivity (Ksat) were conducted within the Bt horizon at three locations within each
of the two proposed drip disposal area. The Bt horizon was tested because it was the
most restrictive soil horizon based on texture and mineralogy.
The geometric mean Ksat of the native Bt horizon (most restrictive) was 0.017 in/hr.
Ksat calculations and field data are shown in Attachment 3.
Single Family Loading Rate Worksheet
A single-family water balance calculation was conducted per the above referenced
regulation. Based on the geometric mean Ksat and our field observations, these soils fall
under Loading Rate Group SFR-C and could therefore be loaded from 13.0-19.5 in/yr.
Parameters utilized in the SFR Irrigation Area Calculation Worksheet are described
below:
Potential Evapotranspiration (PET) and 80th Percentile Irrigation:
Data from a nearby site (RDU International Weather Station) for a 58 year period was
utilized in the model per NC DWQ policy guidelines for these parameters. This data is
shown in the attached SFR Irrigation Area Calculation Worksheet (Attachment 4).
Drainage Rate and Discussion of Drainage Coefficient Utilized in the SFR Irrigation
Area Worksheet:
We are proposing a drainage coefficient of 25%, which results in an actual Annual
Hydraulic Loading Rate of 18.67 inches/year. We feel that this is a reasonable drainage
rate given the surface texture of the A horizon, as well as the landscape position of the
proposed spray field (broad ridge top).
Standard Fertility Analysis
Soils within the proposed spray area were also analyzed for current fertility conditions.
Because of similar landscape type and management conditions, one composite sample
was used to infer soil fertility status within the proposed dispersal area. The standard soil
fertility analysis was completed by Waypoint Analytical Laboratories, Inc. Soil sample
results are included in "Soil Analysis Report" provided by Waypoint Analytical
(Attachment 5). Base saturation and exchangeable sodium percentage were determined
by calculation to be 59% and 1.78% respectively. Appendix 5 also contains information
on other soil parameters such as specific nutrient indices and pH.

Conclusions
Site disturbance could create unsuitable conditions for the proposed system and should
therefore be minimized prior to construction. A permanent vegetative cover should be
immediately established and/or maintained over the entire application field after
installation.
An individual wastewater system permit will be required for this property prior to
obtaining a building permit. This will involve a detailed evaluation by the state to
determine, among other things, system size and layout, drive/parking and building
location. Only after developing this information can a final determination be made
concerning specifics of system design and site utilization. The letter of denial regarding
subsurface septic systems issued by Chatham County Environmental Health should also
be included in the application for a surface application system.
If you have any further questions, please feel free to call [phone].
Sincerely,
G. Christopher Murray, MS
NC Licensed Soil Scientist
Piedmont Environmental Associates, PA
List of Attachments:
Attachment 1 - Soil Map
Attachment 2 - Soil Profile Descriptions at Ksat Locations
Attachment 3 - Ksat Summary and Field Data
Attachment 4 - SFR Irrigation Area Workbook Pages (Including Project Information,
Potential Evapotranspiration Worksheet, 80' Percentile Precipitation Worksheet and
Irrigation Area Calculation Worksheet)
Attachment 5 - Standard Fertility Analysis

Attachment 2 - Soil Profile Descriptions at Ksat Locations
Project:
Marthas Vineyard, 1A
% Slope:
2%
Site:
Nest 1
Vegetation:
Wooded
PIEDMONT
Name:
Marthas Chapel
Conducted By:
GC Murray
Date:
2/2/2023
ENVIRONMENTAL
Soil Series:
ASS0CIATEs, P.A.
N
0
3
w
LU
N
w
N
t
O O
N
O O
N o
L
L
L 0
•�
U U
a
�n V
L
++
y
++ t�
'L
rr
rLr 44
44
4� 0
N
K
'Ji
7
7
+U+
7 N V N
717
o
5 5
5
5 �
5
n
n
n 5 n a
AB
0-8
1 10YR 6/4
-
I -
I -
I moist
I sl
I wk
I med
gr
fr
ss
sp
Bt
9-25
1 10YR6/8110YR6/1,2.5YR5/81
com
I med
I C&DI
moist
I c
I mod
I med
sbk
vfi
vs
vp
BC
25-47
1 10YR6/4110YR6/1,2.5YR5/81
com
I med
I C&DI
moist
I scl
I mod
I med
sbk
vfi
vs
vp
Legend:
Texture
s
sand
I
loam
si
silt
sil
silt loam
c
clay
cl
clay loam
scl
sandy clay loam
sl
sandy loam
Sid
silty clay loam
Structure Grade
Structure Type
Structure Size
wk weak
gr
granular
f fine
m moderate
pl
platy
med medium
str strong
pr
prismatic
cpr
columnar
abk
angular blocky
sbk
subangular blocky
Moist Consistency
sg
single grained
fr friable
ma
massive
vfr very friable
fi firm
vfi very firm
Seasonal High Water Table:
Depth (") Type (apparent/perched):
16 perched

Attachment 2 - Soil Profile Descriptions at Ksat Locations
Project:
Marthas Vineyard, 1A
% Slope:
2%
Site:
Nest
Vegetation:
Wooded
PIEDMONT
Name:
Marthas Chapel
Conducted By:
GC Murray
Date:
2/2/2023
ENVIRONMENTAL
Soil Series:
ASS0CIATEs, P.A.
N
0
3
w
LU
N
w
N
t
O O
N
O O
N o
L
L
L 0
•�
U U
a
�n V
L
++
y
++ t�
'L
rr
rLr 44
44
4� 0
N
K
'Ji
7
7
+U+
7 N V N
717
o
5 5
5
5 �
5
n
n
n 5 n a
AB
0-8
10YR 6/4
-
-
I -
moist
sl
wk
med
gr
fr
ss
sp
Bt
9-27
10YR 6/8
1OYR 6/1, 2.5YR 5/8
com
med
I C&D
moist
c
mod
med
sbk
vfi
vs
vp
BC
28-46
10YR 6/4
1OYR 6/1, 2.5YR 5/8
com
med
C&D
moist
scl
mod
med
sbk
vfi
vs
vp
C
47-84
2.5YR 3/4
1OYR 6/1, 2.5YR 5/8
com
med
C&D
moist
sl
structureless, massive
fr
s
p
Legend:
Texture
s
sand
I
loam
si
silt
sil
silt loam
c
clay
cl
clay loam
scl
sandy clay loam
sl
sandy loam
Sid
silty clay loam
Structure Grade
Structure Type
Structure Size
wk weak
gr
granular
f fine
m moderate
pl
platy
med medium
str strong
pr
prismatic
cpr
columnar
abk
angular blocky
sbk
subangular blocky
Moist Consistent
sg
single grained
fr friable
ma
massive
vfr very friable
fi firm
vfi very firm
Seasonal High Water Table:
Depth (") Type (apparent/perched):
17 perched

Attachment 2 - Soil Profile Descriptions at Ksat Locations
Project:
Marthas Vineyard, 1A
% Slope:
2%
Site:
Nest
Vegetation:
Wooded
PIEDMONT
Name:
Marthas Chapel
Conducted By:
GC Murray
Date:
2/2/2023
ENVIRONMENTAL
Soil Series:
ASS0CIATEs, P.A.
N
0
3
w
LU
N
w
N
t
O O
N
O O
N o
L
L
L 0
•�
U U
a
�n V
L
++
y
++ t�
'L
rr
rLr 44
44
4� 0
N
K
'Ji
7
7
+U+
7 N V N
717
o
5 5
5
5 �
5
n
n
n 5 n a
AB
0-8
10YR 6/4
-
-
I -
moist
sl
wk
med
gr
fr
ss
sp
Bt
9-20
10YR 6/8
1OYR 6/1, 2.5YR 5/8
com
med
C&D
moist
c
mod
med
sbk
vfi
vs
vp
BC
21-48
10YR 6/4
1OYR 6/1, 2.5YR 5/8
com
med
C&D
moist
scl
mod
med
sbk
vfi
vs
vp
Legend:
Texture
s
sand
I
loam
si
silt
sil
silt loam
c
clay
cl
clay loam
scl
sandy clay loam
sl
sandy loam
Sid
silty clay loam
Structure Grade
Structure Type
Structure Size
wk weak
gr
granular
f fine
m moderate
pl
platy
med medium
str strong
pr
prismatic
cpr
columnar
abk
angular blocky
sbk
subangular blocky
Moist Consistent
sg
single grained
fr friable
ma
massive
vfr very friable
fi firm
vfi very firm
Seasonal High Water Table:
Depth (") Type (apparent/perched):
15 perched

Appendix 3, Geometric Mean Ksat Data, Martha's Chapel Lot 1A, Jan 2023
Nest
Horizon
Depth(")
Ksat (in/hr)
N 1
Bt
18
0.020
N2
Bt
13
0.017
N3
Bt
15
0.015
Geometric Mean Ksat:
Horizon Ksat (in/hr)
Bt 0.017

INFORMATION
SITE ID #
Lot 1 Nest 1
LOCATION (COORDINATE SYSTEM)
Date
1 /14/2023
Measurement Conducted By
CM/SR
Job Name
Martha's Chapel Rd
Job Number
3928
Weather Condition
Temperature
Soil
Horizon
Bt
Source of Water
Depth of Hole
18
Radius of Hole
2.54
Initial Depth of Water in Hole (H)
15.24
cm
Final Depth of Water in Hole (H)
15.24
cm
Ratio H/r
6.0000
Start Saturation Time
Start of Steady -State Condition Time
No. of Reservoirs Used at Steady -State
1
A factor in Equation [2] of Manual
0.001127
Hole Depth: 18 45.72
H;: 6 15.24
Hf 6 15.24
Clock
Time
Water Level
Reading
Time Interval
Change in
Water Level
Flow Volume
Flow rate
Q
Flow rate
Q
Ksat
Ksat
Equivalent
Ksat
cm
Minute
cm
cm3
cm3/min
cm3/hour
cm/hour
cm/day
gpd/sq. ft
9.38
6.5
9.58
5.5
20.00
1
20
1.00
60.0
0.07
1.62
0.40
11.03
3
65.00
2.5
50
0.77
46.2
0.05
1.25
0.31
11.44
1.4
41.00
1.6
32
0.78
46.8
0.05
1.27
0.31
1221
Ol
37.00
1.41
28
0.76
45.41
0.05
1 1.23
1 0.30
AVERAGE
cm/hr: 0.052
in/hr: 0.020

INFORMATION
SITE ID #
Lot 1 Nest 2
LOCATION (COORDINATE SYSTEM)
Date
1 /14/2023
Measurement Conducted By
CM/SR
Job Name
Martha's Chapel Rd
Job Number
3928
Weather Condition
Temperature
Soil
Horizon
Bt
Source of Water
Depth of Hole
13
Radius of Hole
2.54
Initial Depth of Water in Hole (H)
15.24
cm
Final Depth of Water in Hole (H)
15.24
cm
Ratio H/r
6.0000
Start Saturation Time
Start of Steady -State Condition Time
No. of Reservoirs Used at Steady -State
1
A factor in Equation [2] of Manual
0.001127
Hole Depth: 13 33.02
H;: 6 15.24
Hf: 6 15.24
Clock
Time
Water Level
Reading
Time Interval
Change in
Water Level
Flow Volume
Flow rate
Q
Flow rate
Q
Ksat
Ksat
Equivalent
Ksat
cm
Minute
cm
cm3
cm3/min
cm3/hour
cm/hour
cm/day
gpd/sq. ft
9.55
5
10.08
4.4
13.00
0.6
12
0.92
55.4
0.06
1.50
0.37
11.04
2.6
56.00
1.8
36
0.64
38.6
0.04
1.04
0.26
11.45
1.2
41.00
1.4
28
0.68
41.0
0.05
1.11
0.27
1223
Ol
38.00
1.21
24
0.63
37.91
0.04
1 1.02
1 0.25
AVERAGE
cm/hr: 0.044
in/hr: 0.017

INFORMATION
SITE ID #
Lot 1 Nest 3
LOCATION (COORDINATE SYSTEM)
Date
1 /14/2023
Measurement Conducted By
CM/SR
Job Name
Martha's Chapel Rd
Job Number
3928
Weather Condition
Temperature
Soil
Horizon
Bt
Source of Water
Depth of Hole
15
Radius of Hole
2.54
Initial Depth of Water in Hole (H)
15.24
cm
Final Depth of Water in Hole (H)
15.24
cm
Ratio H/r
6.0000
Start Saturation Time
Start of Steady -State Condition Time
No. of Reservoirs Used at Steady -State
1
A factor in Equation [2] of Manual
0.001127
Hole Depth: 15 38.1
H;: 6 15.24
Hf: 6 15.24
Clock
Time
Water Level
Reading
Time Interval
Change in
Water Level
Flow Volume
Flow rate
Q
Flow rate
Q
Ksat
Ksat
Equivalent
Ksat
cm
Minute
cm
cm3
cm3/min
cm3/hour
cm/hour
cm/day
gpd/sq. ft
9.55
5
10.15
4.2
20.00
0.8
16
0.80
48.0
0.05
1.30
0.32
11.09
2.5
54.00
1.7
34
0.63
37.8
0.04
1.02
0.25
11.51
1.5
42.00
1
20
0.48
28.6
0.03
0.77
0.19
12.42
0
51.00
1.5
30
0.59
35.3
0.04
0.95
0.24
1bt.UU
AVERAGE
cm/hr: 0.038
in/hr: 0.015

Project Name: Marthas Vineyard Way Lot 1A
Facility Address: Across from 1032 Martha's Chapel Rd.
Apex, NC 27523
County: Chatham County, NC
Prepared by: G. Christopher Murray, L.S.S.
Project Design Flow = 600 gal/day
# of Bedrooms
Required Flow
2 bedrooms
240 gal/day
3 bedrooms
360 gal/day
4 bedrooms
480 gal/day
5 bedrooms
600 gal/day
6 bedrooms
720 gal/day
SFR-LRW 9-08

Project Name: Marthas Vineyard Way Lot 1A
Location of Temperature Data: RDU Int. Airport - Raleigh, NC
Starting Year of Data Record: 1948
Ending Year of Data Record: 2006
Period of Record (years): 58
Source of Data: State Climate Office of North Carolina
Site Latitude (degrees) 35.79 within range
Calculated PET: 33.45 inches
Mean Monthly
Temperature
(degrees F)
Daylight
Hours 112
Heat Index
Calculated
PET
(inches)
January
41.1
0.87
1.02
0.29
February
44.8
0.85
1.70
0.50
March
51.2
1.03
3.15
1.20
April
59.4
1.09
5.40
2.30
May
67.6
1.21
8.02
3.96
June
75.6
1.22
10.90
5.55
July
79.0
1.23
12.21
6.39
August
77.7
1.16
11.71
5.74
September
71.1
1.03
9.24
3.92
October
60.6
0.97
5.76
2.19
November
51.5
0.86
3.22
1.02
December
42.6
0.85
1.28
0.37
Total =
73.61
33.45
SFR-LRW 9-08

Project Name: Marthas Vineyard Way Lot 1A
Location of Precipitation Data: RDU Int. Airport - Raleigh, NC
Starting Year of Data Record: 1948
Ending Year of Data Record: 2006
Period of Record (years): 58
Source of Data: State Climate Office of North Carolina
80th Percentile Annual Precipitation: 54.48
Total =
Mean
Monthly
Precipitation
% of Mean
Annual
Precipitation
80th
Percentile
Monthly
Precipitation
3.60
8.21
4.47
2.88
6.57
3.58
4.30
9.80
5.34
3.06
6.98
3.80
2.26
5.15
2.81
2.93
6.68
3.64
5.51
12.56
6.84
5.00
11.40
6.21
5.81
13.25
7.22
2.90
6.61
3.60
2.75
6.27
3.42
2.86
6.52
3.55
43.86
100.00
54.48
SFR-LRW 9-08

Project Name: Marthas Vineyard Way Lot 1A
Annual Hydraulic
Design Flow = 600 gal/day Loading Rate =
SFR Loading Rate Group: SFR-C
Limiting Soil Ksat = 0.017 inch/hour Irrigation Area =
Drainage Coefficient = 0.250 =
18.67 inchlyr
18,814 square ft
0.43192 acres
Drainage Rate = 0.102 inch/day (Formula: Ksat * Drainage Coefficient' 24)
Number of
Days in the
Month
PET
inlmo
Vertical
Drainage
inlmo
80th Percentile
Monthly
Precipitation
inlmo
Maximum
Allowable
Irrigation
inlmo(gallons/day)
Maximum
Allowable
Irrigation
Maximum
Allowable
Irrigation
allonslmonth
January
31
0.29
3.16
4.47
0.00
0
0
February
28
0.50
2.86
3.58
0.00
0
0
March
31
1.20
3.16
5.34
0.00
0
0
April
30
2.30
3.06
3.80
1.56
610
18,311
May
31
3.96
3.16
2.81
4.31
1,632
50,601
June
30
5.55
3.06
3.64
4.97
1,945
58,345
July
31
6.39
3.16
6.84
2.71
1,024
31,735
August
31
5.74
3.16
6.21
2.69
1,020
31,605
September
30
3.92
3.06
7.22
0.00
0
0
October
31
2.19
3.16
3.60
1.75
663
20,562
November
30
1.02
3.06
3.42
0.67
261
7,843
December
31
0.37
3.16
3.55
0.00
0
0
TOTAL = 365 33.45 37.23 54.48
Formulas: (Max. Allowable Irrigation) = (PET) + (Drainage) - (Precipitation)
SFR Loading Rate
Table
SFR
Maximum Annual
Geometric Mean
Loading
Loading Rate
Ksar Range
Rate
(in/yr)
(in/hr)
Group
Low - High
Low - High
SFR-A
26.0 - 50.0
>0.05
SFR-B
19.5 - 26.0
0.015 - 0.05
SFR-C
13.0-19.5
0.003-0.015
SFR-D
0.0 - 13.0
0.0 - 0.003
Assignment to a SFR Loading Rate Group for each 15A NCAC 02T .0600
permit application shall be determined by the geometric mean of insitu
saturated hydrualic conductivity data collected in the most restrictive
horizon for each soil mapping unit within the irrigation area.
18.67 7155.37 219,000
Required Flow
2 bedrooms
240 gal/day
87,600 gal/yr
3 bedrooms
360 gal/day
131,400 gal/yr
4 bedrooms
480 gal/day
175,200 gal/yr
5 bedrooms
600 gal/day
219,000 gal/yr
6 bedrooms
720 gal/day
1 262,800 gal/yr
Maximum allowable
irrigation: 219,000 gal/yr
The Maximum Allowable Irrigation number must be
greater than or equal to the required flow.
SFR-LRW 9-08

Waypoel t
ANALYTICAL
Client :
Piedmont Enviromental Assoc., P. A.
216 South Swing Road
Suite 1
Greensboro INC 27310
Lab No: 22061
2850 Daisy Lane, Wilson, NC 27896
Main 252-206-1721 ° Fax [phone]
"Every acre... Every year®' www.waypointanalyrical.com
Grower : Report No:
PIEDMONT ENVIRONMENTAL Cust No:
Farm: MARTHA CHAPEL
Field:
Date Printed:
Date Received
PO:
Page
Sample ID: 1A
SOIL ANALYSIS
23-170-0524
06526
06/21/2023
06/19/2023
1 of 4
Test
Method
Results
SOIL TEST RATINGS
Calculated Cation
Exchange Capacity
w
Low
Medium
Optimum
Soil pH
1:1
5.0
4.0 meq/100g
Buffer pH
BPH
6.77
%Saturation
Phosphorus (P)
M3
89 ppm
%sat meq
K 4.2 0.2
Ca 38.0 1.5
Mg 15.8 0.6
H 40.0 1.6
Na 1.0 0
Potassium (K)
M3
66 ppm
all
Calcium (Ca)
M3
304 ppm
Magnesium (Mg)
M3
76 ppm
Sulfur (S)
M3
10 ppm
Boron (B)
M3
0.1 ppm
Copper (Cu)
M3
1.2 ppm
Iron (Fe)
M3
262 ppm
K/Mg Ratio: 0.26 ❑
Manganese (Mn)
M3
23 ppm
Ca/Mg Ratio: 2.41 ❑
Zinc (Zn)
M3
6.9 ppm
Sodium (Na)
M3
9 ppm
Soluble Salts
Organic Matter
LOI
0.1 %
Estimated N Release
46 Ibs/acre
Nitrate Nitrogen
SOIL FERTILITY GUIDELINES
Crop :
Rec Units:
(Ibs) LIME (tons)
N
P20,
K 20
Mg
S
B
Cu
Mn
Zn
Fe
Crop : Rec Units:
Comments :
M3 - Mehlich 3 BPH - Lime Index HIM - Humic Matter LOI - Loss On Ignition 1:1 -Water pH
Analysis prepared by: Waypoint Analytical Carolina, Inc.