WQ0040692_Other_20211124

Engineers and Soil Scientists
Agri -Waste Technology, inc.
501 North Salem Street
Suite 203
Apex, NC 27592
919-859-0669
www.agriwaste.com
November 24, 2021
Mr. Brian Janes
972 New Elam Church Road
New Hill, NC 27562
Subject: Fill soil evaluation letter
Permit WQ0040692 — Schedule I.3
Agri -Waste Technology, Inc. (AWT) has reviewed the fill soil specified in the subject permit for
construction of a single-family residence wastewater irrigation system. In the soil scientist
summary report (AWT report dated January 21, 2019) for the permit application it was
recommended that fill soil should be added to level the depression that was observed during the
soil evaluation. In addition to filling the depression, as part of the irrigation field design, a
minimum of 4 inches of fill soil was specified to level and "smooth" the grade prior to
installation of the drip tubing.
Please note that the original soil evaluation indicated that, under natural conditions, the perched
seasonal high water table was already at a minimum of 12" below the soil surface. The
additional of the fill soil was not to satisfy the separation to the perched seasonal high water
table. The separation distance was confirmed in a site visit with the NC DEQ Soil Scientist (Mr.
Gary Kreiser) during a site visit on 5/3/19.
The fill soil was designed to allow for adequate infiltration to avoid ponding and runoff of
applied effluent and to level the drainfield surface. Chris McGee, LSS reviewed the cleared
drainfield and evaluated a representative sample of the fill material prior to installation of the fill
soil. The fill material is a sandy loam textured topsoil mix.
Kevin Davidson, PE reviewed the placed fill material on October 26, 2021 and re -inspected the
drainfield on November 15, 2021 to observe the grass growing on the field (stabilization of the
fill material).
The placed fill material leveled the depression and also smoothed the soil surface prior to
installing the drip tubing. The placed fill soil was conditioned and allowed for establishment of a
good vegetative cover.

The surface texture of sandy loam will allow infiltration at 0.4 to 0.6 inches per hour, which is
well above the permitted limit of 0.16 inches per hour. Therefore, no ponding of effluent is
expected. The deeper soil permeability was measured prior to the permitting of this site. The
permeability was assessed by measuring saturated hydraulic conductivity in the least permeable
soil layer. No changes to these rates are expected, and the system is designed around the most
restrictive layers with a conservative design (drainage) factor as shown in the original permit
application submittal. No soil compaction was noted during any of the site inspections.
In summary, the fill placement meets the specifications for this project and it is expected to allow
system operation with no ponding or runoff, and will allow for minimal separation of 12 inches
or greater to the seasonal high water table.
This letter has been submitted to the Raleigh Regional Office of NC DEQ on your behalf to
satisfy the permit requirement.
We appreciate the opportunity to assist you. Please contact us with any questions, concerns, or
comments upon review of this information.
Sincerely,
CJ.- '� ltq—
Christopher McGee, L S S
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