ChesterfieldLakeSoilsReport
Soil Suitability for Domestic
Sewage Treatment and
Disposal Systems
Prepared For: Edward Perakek, Buyer
Prepared By: Sloan Griffin, L.S.S.
Report Date: October 8, 2016
Chesterfield Lake Road
Angier, NC
Harnett County
PIN 0671-99-6250
1
Soil Suitability for Domestic Sewage Treatment and Disposal Systems
Chesterfield Lake Road, Angier, NC (Harnett County)
PREPARED FOR: Edward Perakek, Buyer
PREPARED BY: Sloan Griffin, L.S.S
DATE: October 8, 2016
Soil suitability for domestic sewage treatment and disposal systems was evaluated on
September 15, 2016, for the property located Chesterfield Lake Road in Angier, NC.
Sloan Griffin of Advanced Septic, Inc. (ASI) conducted the soil evaluation. The detailed
soil evaluation of the land area will follow. A property reference map from Harnett
County GIS is in Attachment 1. A review of the soil and landscape characteristics that
dictate soil suitability for domestic sewage treatment and disposal systems can be found
in Attachment 2.
The total property area is approximately 8 acres. The property is partially wooded with
open grassed areas across the property. A drainage features and a pond are present within
the property (Attachment 3).
Soil Suitability for Domestic Sewage Treatment and Disposal Systems
The aerial map in Attachment 3 details the approximate property boundaries, soil boring
locations, soil types, and soil areas for septic systems. Approximately 22 soil borings
were advanced within the provisionally suitable soils area on the property (Attachment
3). A portion of the property contained a drainage feature, poor landscape position,
disturbed soil, and/or unsuitable soils and, thus, are unsuitable for septic systems.
However, this evaluation was merely a preliminary review to determine what potential
this land might have for domestic sewage treatment and disposal systems. Therefore,
specific types of septic systems, exact locations of future drainfields and repair areas,
plus buffers from property lines (current and potential future lot lines), building
foundations, wells, etc. are not fully considered. These things will need to be more fully
considered as the plans develop for the potential future of this site. It is possible that
additional soil evaluations will be required once lot layouts are considered and developed
for this property so that septic system types and the location of a septic drainfield can be
more fully and appropriately considered.
2
Three areas (see map in Attachment 3) exhibited soil characteristics and soil depths (24”
or greater) that is provisionally suitable for conventional or shallow conventional trench
septic systems. These areas together are approximately 18,573 ft2.
Typical profile descriptions of the provisionally suitable soil for this property are in
Attachment 4.
The provisionally suitable soil borings had the following characteristics. Wetness
features were found in some soil borings between 25” to 32” below the soil surface. Soil
texture was provisionally suitable and was estimated to be loamy sand to loamy sand near
the soil surface (A and E horizons) and a sandy clay loam to sandy clay in the subsoil (B
horizons). Soil structure was provisionally suitable and was estimated to be granular near
the soil surface (A horizons) and weak subangular blocky in the subsoil (B horizons).
Clay mineralogy was provisionally suitable with very friable to friable moist soil
consistence and non-sticky to slightly sticky and non-plastic to slightly plastic wet soil
consistence.
The major soil type on this property is a Wagram Loamy Sand (map symbol WaB and
WaC). The Harnett County Soil Survey indicates that moderate limitations exist for
septic systems installed in these soils types (Attachment 5).
The land area required for a conventional or shallow conventional septic system is
calculated based on the size of the proposed home and the Long-Term Acceptance Rate
(LTAR) of the soil. The LTAR range for the provisionally suitable soils on this property
is 0.3 – 0.6 GPD/ft2 based on the most restrictive soil texture in the subsoil. Table 1
below presents estimated conventional or shallow conventional septic system land area
requirements for several home sizes and LTAR’s on this property. The LTAR suggested
by AWT for a majority of the provisionally suitable soil is 0.35 GPD/ft2, but the final
LTAR for specific septic system types and septic drainfield locations will be set by the
Harnett County Health Department. The detailed computations are in Attachment 6.
Table 1. Estimated Conventional Septic System Land Requirements (including repair
area) for Several Home Sizes and Long-Term Acceptance Rates (LTAR) on this
Property.
House Size Long-Term
Acceptance Rate
(LTAR)
Area Required for
Conventional Septic
System
Minimum Area Required for
Innovative Conventional
Septic System
-----GPD/ft2----- -----ft2----- -----ft2-----
3 bedrooms 0.3 – 0.6 4,500 – 9,000 3,375 – 6,750
3 bedrooms 0.35 ~7,714 ~5,786
4 bedrooms 0.3 – 0.6 6,000 – 12,000 4,500 – 9,000
4 bedrooms 0.35 ~10,286 ~7,714
5 bedrooms 0.3 – 0.6 7,500 – 15,000 5,625 – 11,250
5 bedrooms 0.35 ~12,857 ~9,643
3
Conclusions
Based on the results of this evaluation, the installation of conventional or shallow
conventional septic systems seems very probable on this property in the area designated
on the map in Attachment 3.
We appreciate the opportunity to assist you in this matter. Please contact us with any
questions, concerns, or comments.
ATTACHMENT 1: Property Reference Map
ATTACHMENT 2: Review of Rules Pertaining to Domestic
Sewage Treatment and Disposal Systems
Five categories of soil and landscape characteristics are evaluated to determine soil suitability for
domestic sewage treatment and disposal systems and include: topography and landscape
position, soil morphological characteristics, soil wetness conditions, soil depth, and restrictive
horizons. The soil and landscape characteristics found in a particular location dictate the type(s)
of domestic sewage treatment and disposal system that can be used on a parcel of land. The
detailed rules can be found in Section .1900 – Sewage Treatment and Disposal Systems, but a
general review of the five categories and other relevant rules can be found in the sections below.
.1940 TOPOGRAPHY AND LANDSCAPE POSITION
Uniform slopes less than 15 percent are considered suitable, uniform slopes between 15 and 30
percent are considered provisionally suitable, and slopes greater than 30 percent are considered
unsuitable for domestic sewage treatment and disposal systems. Complex slope patterns and
slopes dissected by gullies and ravines are considered unsuitable for domestic sewage treatment
and disposal systems. Depressions and wetlands are also considered unsuitable for domestic
sewage treatment and disposal systems.
.1941 SOIL MORPHOLOGICAL CHARACTERISTICS
Sandy and coarse loamy textured soils (sand, loamy sand, sandy loam, and loam) are considered
suitable for domestic sewage treatment and disposal systems. Fine loamy and clayey textured
soils (silt, silt loam, sandy clay loam, clay loam, silty clay loam, sandy clay, silty clay, and clay)
are considered provisionally suitable for domestic sewage treatment and disposal systems.
Crumb, granular, and single-grained soil structures are considered suitable for domestic sewage
treatment and disposal systems. Blocky soil structures are considered provisionally suitable for
domestic sewage treatment and disposal systems. Platy, prismatic, and massive soil structures
are considered unsuitable for domestic sewage treatment and disposal systems.
Slightly expansive clay mineralogy is considered suitable for domestic sewage treatment and
disposal systems. Slightly expansive clay minerals exhibit loose, very friable, friable, or firm
moist soil consistence. Expansive clay mineralogy is considered unsuitable for domestic sewage
treatment and disposal systems. Expansive clay minerals exhibit very firm or extremely firm
moist soil consistence. Organic soils are considered unsuitable for domestic sewage treatment
and disposal systems.
.1942 SOIL WETNESS CONDITIONS
Soil wetness conditions are caused by seasonal high water table, perched water table, tidal water,
seasonally saturated soils, or lateral water movement. Soil wetness conditions are indicated by
soil colors, either in mottles or mass, with a chroma of 2 or less according to the Munsell color
charts. Soil wetness conditions detected 48 inches in depth or deeper are considered suitable for
domestic sewage treatment and disposal systems. Soil wetness conditions detected between 36
to 48 inches in depth are considered provisionally suitable for domestic sewage treatment and
disposal systems. Soil wetness conditions detected 36 inches in depth or shallower are
considered unsuitable for domestic sewage treatment and disposal systems.
HaHhhh
.1943 SOIL DEPTH
Soil depths to rock, parent material, or saprolite greater than 48 inches are considered suitable for
domestic sewage treatment and disposal systems. Soil depths to rock, parent material, or
saprolite between 36 and 48 inches are considered provisionally suitable for domestic sewage
treatment and disposal systems. Soil depths to rock, parent material, or saprolite less than 36
inches are considered unsuitable for domestic sewage treatment and disposal systems. Saprolite
has a massive, rock-controlled structure, and retains the mineral arrangement of its parent rock in
at least 50 percent of its volume. Saprolite only forms from metamorphic and igneous rock
parent materials and is typically referred to as “rotten rock”.
.1944 RESTRICTIVE HORIZONS
Restrictive horizons are capable of perching ground water or sewage effluent and are strongly
compacted or cemented. Restrictive horizons resist soil excavation or augering. Soils with
restrictive horizons three inches or more in thickness at depths greater than 48 inches are
considered suitable for domestic sewage treatment and disposal systems. Soils with restrictive
horizons three inches or more in thickness at depths between 36 and 48 inches are considered
provisionally suitable for domestic sewage treatment and disposal systems. Soils with restrictive
horizons three inches or more in thickness at depths less than 36 inches are considered unsuitable
for domestic sewage treatment and disposal systems.
.1950 LOCATION OF SANITARY SEWAGE SYSTEMS HARNETT COUNTY
ENVIRONMENTAL HEALTH DEPARTMENT No area for domestic sewage treatment and
disposal system installation (or repair in Harnett County) may be disturbed by clearing,
excavation, filling, vehicle or equipment traffic, or storage of building materials.
.1947 DETERMINATION OF OVERALL SITE SUITABILITY
.1948 SITE CLASSIFICATION
All of the criteria for the five categories above are to be determined and classified as suitable,
provisionally suitable, or suitable according to the respective rules described above. If all criteria
are classified the same, that overall site classification will prevail. If there is a variation in the
classification of several criteria, the most limiting classification will be used to determine the
overall site classification.
A suitable classification generally indicates soil and landscape conditions favorable for the
operation of a domestic sewage treatment and disposal system or slight limitations that can be
readily overcome by proper design and installation. A provisionally suitable classification
indicates soil and/or landscape conditions have moderate limitations for the operation of a
domestic sewage treatment and disposal system, but modifications and careful planning, design,
and installation can result in satisfactory system function. An unsuitable classification indicates
severe soil and/or landscape limitations for the operation of a domestic sewage treatment and
disposal system.
SUMMARY
Suitable/provisionally suitable landscapes and soils to a depth of 36 inches can, in general, be
used for conventional gravity driven septic systems. Suitable/provisionally suitable landscapes
and soils to a depth of 24 –36 inches can, in general, be used for alternative septic systems such
as shallow conventional and low pressure pipe systems, among others. All alternative systems
for provisionally suitable landscapes and soils must be proposed to and approved by the Harnett
County Environmental Health Department. Any landscapes or soils classified as unsuitable may
be reclassified as provisionally suitable by the Harnett County Environmental Health Department
after a site investigation by department personnel.
ATTACHMENT 3: Property Map Detailing Soil Suitability
for Septic Systems and Soil Types
ATTACHMENT 4: Typical Profile Descriptions of
Provisionally Suitable Soil
Property ID#:
Property Recorded:
County: Harnett
.
SOIL/SITE EVALUATION
FOR
ON-SITE WASTEWATER SYSTEM
Applicant: Edward Perakek Owner: X Agent: Phone:
Address: Date Evaluated: 9/15/2016
Proposed Facility: Residential
Property Size: Approximately 8 acres
Location Site: Chesterfield Lake Road, Angier, NC
Water Supply: On Site Well Comm. Well Public X Other Evaluation Method: Auger Boring X Pit Cut
TYPICAL PROFILE
Horizon/
Depth (IN)
Matrix
Mottles Mottle
Abundance
/ Contrast
(a)(1)
Texture
(a)(2)
Structure
(a)(3)
Minerolog
y
Consistence
Wet
Consistence
Moist
A 0-8” 10YR 5/3 None None LS GR NEXP NS, NP Vfr
E 7-23” 10YR 7/4 None None LS GR NEXP NS, NP VFr
Bt 23-36” 10YR 6/6 None 2mD SC wSBK SEXP SS, SP Fr
.1940 Landscape Pos/Slope %
- Suitable, <15% Profile LTAR
- 0.6 – 0.3 GPD/ft2
.1942 Wetness Condition - Suitable System Type - Provisionally suitable for
shallow conventional systems
due to texture, structure, and
depth.
.1943/.1956 Saprolite
- Suitable
.1944 Restrictive Horizon
- Suitable .1948 Profile Classification - Provisionally suitable
Comments:
TYPICAL PROFILE
Horizon/
Depth (IN)
Matrix
Mottles Mottle
Abundance
/Contrast
(a)(1)
Tex-
ture
(a)(2)
Structure
(a)(3)
Minerolog
y
Consistence
Wet
Consistence
Moist
.1940 Landscape Pos/Slope % Profile LTAR
.1942 Wetness Condition System Type
.1943/.1956 Saprolite .1944 Restrictive Horizon
.1948 Profile Classification
Comments:
EVALUATED BY: Sloan Griffin
COMMENTS:
LEGEND OF ABBREVIATIONS FOR SITE EVALUATION FORM
LANDSCAPE
POSITION
CC - Concave Slope
CV - Convex Slope
DS - Debris Slump
D - Depression
DW - Drainage Way
FP - Flood Plain
FS - Foot Slope
H - Head Slope
I - Interflueve
L - Linear Slope
N - Nose Slope
P - Pocosin
R - Ridge
S - Shoulder
T - Terrace
STRUCTURE
G - Single Grain
M - Massive
CR - Crumb
GR - Granular
SBK - Subgranular Blocky
ABK - Angular Blocky
PL - Platy
PR - Prismatic
TEXTURE GROUP
I
II
III
IV
MOIST CONSISTENCE
Vfr - Very Friable
Fr - Friable
Fi - Firm
Vfi - Very Firm
Efi - Extremely Firm
TEXTURE CLASS
S - Sand
LS - Loamy Sand
SL - Sandy Loam
L - Loam
SCL - Sandy Clay Loam
CL - Clay Loam
SiL - Silt Loam
Si - Silt
SiCL - Silt Clay Loam
SC - Sandy Clay
C - Clay
SiC - Silty Clay
O - Organic
MOTTLES
1 - Few
2 - Common
3 - Many
F - Faint
D - Distinct
P - Prominent
f - Fine
m - Medium
c - Coarse
.1955 LTAR
(gal/day/sqft)
1.2 - .08
0.8 - 0.6
0.6 - 0.3
0.4 - 0.1
WET CONSISTENCE
NS - Non Sticky
SS - Slightly Sticky
S - Sticky
VS - Very Sticky
NP - Non Plastic
SP - Slightly Plastic
P - Plastic
VP - Very Plastic
ATTACHMENT 5: Soil Survey Information
ATTACHMENT 6: Septic System Area Computation
Spreadsheets
Conventional Septic System Area Computation Created by: SG
Created on: 10/8/2016
Client Name:Pekarek
Number Bedrooms:3
Design Flow (gal/day): 360 (120 gal/day/bedroom, minimum 240 gal/day/dwelling)
LTAR (gal/day/ft2)0.3
Trench Bottom Area (ft2):1200 (Design flow/LTAR)
Trench Width (ft): 3
On-center distance between trenches (ft): 9
Trench Bottom Length (ft): 400
Minimum Field Area Required (ft2):3600 (Trench Bottom Length*Trench on-center distance)
Minimum Field Area Required (Innovative) (ft2):2700 (25% reduction from above)
Total Field Area Required (ft2)(1):9000 (Minimum field area*2.5)
Total Field Area Required (Innovative) (ft2)(1):6750 (25% reduction from above)
Total Field Area Required (ft2)(1):10800 (Minimum field area*3)
Total Field Area Required (Innovative) (ft2)(1):8100 (25% reduction from above)
(1) Provides for reserve area and soil irregularity, 2.5 to 3 is multiplier.
Client Name:Pekarek
Number Bedrooms:3
Design Flow (gal/day): 360 (120 gal/day/bedroom, minimum 240 gal/day/dwelling)
LTAR (gal/day/ft2)0.6
Trench Bottom Area (ft2):600 (Design flow/LTAR)
Trench Width (ft): 3
On-center distance between trenches (ft): 9
Trench Bottom Length (ft): 200
Minimum Field Area Required (ft2):1800 (Trench Bottom Length*Trench on-center distance)
Minimum Field Area Required (Innovative) (ft2):1350 (25% reduction from above)
Total Field Area Required (ft2)(1):4500 (Minimum field area*2.5)
Total Field Area Required (Innovative) (ft2)(1):3375 (25% reduction from above)
Total Field Area Required (ft2)(1):5400 (Minimum field area*3)
Total Field Area Required (Innovative) (ft2)(1):4050 (25% reduction from above)
(1) Provides for reserve area and soil irregularity, 2.5 to 3 is multiplier.
Client Name:Pekarek
Number Bedrooms:3
Design Flow (gal/day): 360 (120 gal/day/bedroom, minimum 240 gal/day/dwelling)
LTAR (gal/day/ft2)0.35
Trench Bottom Area (ft2):1028.571 (Design flow/LTAR)
Trench Width (ft): 3
On-center distance between trenches (ft): 9
Trench Bottom Length (ft): 342.8571
Minimum Field Area Required (ft2):3085.714 (Trench Bottom Length*Trench on-center distance)
Minimum Field Area Required (Innovative) (ft2):2314.286 (25% reduction from above)
Total Field Area Required (ft2)(1):7714.286 (Minimum field area*2.5)
Total Field Area Required (Innovative) (ft2)(1):5785.714 (25% reduction from above)
Total Field Area Required (ft2)(1):9257.143 (Minimum field area*3)
Total Field Area Required (Innovative) (ft2)(1):6942.857 (25% reduction from above)
(1) Provides for reserve area and soil irregularity, 2.5 to 3 is multiplier.
Conventional Septic System Area Computation Created by: SG
Created on: 10/8/2016
Client Name:Pekarek
Number Bedrooms:4
Design Flow (gal/day): 480 (120 gal/day/bedroom, minimum 240 gal/day/dwelling)
LTAR (gal/day/ft2)0.3
Trench Bottom Area (ft2):1600 (Design flow/LTAR)
Trench Width (ft): 3
On-center distance between trenches (ft): 9
Trench Bottom Length (ft): 533.3333
Minimum Field Area Required (ft2):4800 (Trench Bottom Length*Trench on-center distance)
Minimum Field Area Required (Innovative) (ft2):3600 (25% reduction from above)
Total Field Area Required (ft2)(1):12000 (Minimum field area*2.5)
Total Field Area Required (Innovative) (ft2)(1):9000 (25% reduction from above)
Total Field Area Required (ft2)(1):14400 (Minimum field area*3)
Total Field Area Required (Innovative) (ft2)(1):10800 (25% reduction from above)
(1) Provides for reserve area and soil irregularity, 2.5 to 3 is multiplier.
Client Name:Pekarek
Number Bedrooms:4
Design Flow (gal/day): 480 (120 gal/day/bedroom, minimum 240 gal/day/dwelling)
LTAR (gal/day/ft2)0.6
Trench Bottom Area (ft2):800 (Design flow/LTAR)
Trench Width (ft): 3
On-center distance between trenches (ft): 9
Trench Bottom Length (ft): 266.6667
Minimum Field Area Required (ft2):2400 (Trench Bottom Length*Trench on-center distance)
Minimum Field Area Required (Innovative) (ft2):1800 (25% reduction from above)
Total Field Area Required (ft2)(1):6000 (Minimum field area*2.5)
Total Field Area Required (Innovative) (ft2)(1):4500 (25% reduction from above)
Total Field Area Required (ft2)(1):7200 (Minimum field area*3)
Total Field Area Required (Innovative) (ft2)(1):5400 (25% reduction from above)
(1) Provides for reserve area and soil irregularity, 2.5 to 3 is multiplier.
Client Name:Pekarek
Number Bedrooms:4
Design Flow (gal/day): 480 (120 gal/day/bedroom, minimum 240 gal/day/dwelling)
LTAR (gal/day/ft2)0.35
Trench Bottom Area (ft2):1371.429 (Design flow/LTAR)
Trench Width (ft): 3
On-center distance between trenches (ft): 9
Trench Bottom Length (ft): 457.1429
Minimum Field Area Required (ft2):4114.286 (Trench Bottom Length*Trench on-center distance)
Minimum Field Area Required (Innovative) (ft2):3085.714 (25% reduction from above)
Total Field Area Required (ft2)(1):10285.71 (Minimum field area*2.5)
Total Field Area Required (Innovative) (ft2)(1):7714.286 (25% reduction from above)
Total Field Area Required (ft2)(1):12342.86 (Minimum field area*3)
Total Field Area Required (Innovative) (ft2)(1):9257.143 (25% reduction from above)
(1) Provides for reserve area and soil irregularity, 2.5 to 3 is multiplier.
Conventional Septic System Area Computation Created by: SG
Created on: 10/8/2016
Client Name:Pekarek
Number Bedrooms:5
Design Flow (gal/day): 600 (120 gal/day/bedroom, minimum 240 gal/day/dwelling)
LTAR (gal/day/ft2)0.3
Trench Bottom Area (ft2):2000 (Design flow/LTAR)
Trench Width (ft): 3
On-center distance between trenches (ft): 9
Trench Bottom Length (ft): 666.6667
Minimum Field Area Required (ft2):6000 (Trench Bottom Length*Trench on-center distance)
Minimum Field Area Required (Innovative) (ft2):4500 (25% reduction from above)
Total Field Area Required (ft2)(1):15000 (Minimum field area*2.5)
Total Field Area Required (Innovative) (ft2)(1):11250 (25% reduction from above)
Total Field Area Required (ft2)(1):18000 (Minimum field area*3)
Total Field Area Required (Innovative) (ft2)(1):13500 (25% reduction from above)
(1) Provides for reserve area and soil irregularity, 2.5 to 3 is multiplier.
Client Name:Pekarek
Number Bedrooms:5
Design Flow (gal/day): 600 (120 gal/day/bedroom, minimum 240 gal/day/dwelling)
LTAR (gal/day/ft2)0.6
Trench Bottom Area (ft2):1000 (Design flow/LTAR)
Trench Width (ft): 3
On-center distance between trenches (ft): 9
Trench Bottom Length (ft): 333.3333
Minimum Field Area Required (ft2):3000 (Trench Bottom Length*Trench on-center distance)
Minimum Field Area Required (Innovative) (ft2):2250 (25% reduction from above)
Total Field Area Required (ft2)(1):7500 (Minimum field area*2.5)
Total Field Area Required (Innovative) (ft2)(1):5625 (25% reduction from above)
Total Field Area Required (ft2)(1):9000 (Minimum field area*3)
Total Field Area Required (Innovative) (ft2)(1):6750 (25% reduction from above)
(1) Provides for reserve area and soil irregularity, 2.5 to 3 is multiplier.
Client Name:Pekarek
Number Bedrooms:5
Design Flow (gal/day): 600 (120 gal/day/bedroom, minimum 240 gal/day/dwelling)
LTAR (gal/day/ft2)0.35
Trench Bottom Area (ft2):1714.286 (Design flow/LTAR)
Trench Width (ft): 3
On-center distance between trenches (ft): 9
Trench Bottom Length (ft): 571.4286
Minimum Field Area Required (ft2):5142.857 (Trench Bottom Length*Trench on-center distance)
Minimum Field Area Required (Innovative) (ft2):3857.143 (25% reduction from above)
Total Field Area Required (ft2)(1):12857.14 (Minimum field area*2.5)
Total Field Area Required (Innovative) (ft2)(1):9642.857 (25% reduction from above)
Total Field Area Required (ft2)(1):15428.57 (Minimum field area*3)
Total Field Area Required (Innovative) (ft2)(1):11571.43 (25% reduction from above)
(1) Provides for reserve area and soil irregularity, 2.5 to 3 is multiplier.