SW3221008_Soils/Geotechnical Report_20230208

February 2, 2023
Mr. Ben Kuhn
JHC NC LLC
370 Centerpointe Circle, Suite 1136
Alamonte Springs, Florida 32701
Email: [e-mail]
Subject: Report of Double Ring Infiltrometer Testing
Estates at Marvin Branch DRI
Joe Kerr Road
Marvin, North Carolina
SUMMIT Project No. 8333.G0003
Dear Mr. Kuhn:
SUMMIT
ENGINEERING • LABORATORY • TESTING
A Universol Engineering Sciences Compony
As requested, Summit Engineering, Laboratory & Testing, Inc. (SUMMIT) has performed
infiltration testing for the Estates at Marvin Branch located east of 9614 Joe Kerr Road in
Marvin, North Carolina. A more detailed description of the site location and our test
results can be found on the attached figures. The following paragraphs provide a brief
summary of our observations and test results.
Observations and Testing
SUMMIT visited the project site and performed one (1) double -ring infiltrometer test at
the existing drainage basin. Upon arriving to the site, it was observed that the drainage
basin was graded and seeded with grass, adjacent to a newly built roadway. The test was
performed at approximately 4 feet below the ground surface. No elevation data was
provided to SUMMIT prior to the infiltration test.
After preparing the ground and positioning the double -ring apparatus, water was added
to a sufficient level to allow for a clear view and water level measurements. SUMMIT
recorded the initial water level and then recorded water level measurement every 30
minutes for the following 240 minutes (4 hours) until the rate of infiltration stabilized.

Report ofDouble Ring Infiltrometer Testing October 31, 2022
Brighton Park DRI BMP #1 SUMMIT Project No. 8976. G0003
Infiltrometer Testing Results
The subgrade soils exposed within the drainage field consisted of a light brown slightly
clayey sandy silt. After the second hour of testing, the infiltration rate for the testing
location began to stabilize, which may indicate saturation of the subgrade soils. The
measured infiltration rates then remained constant throughout the remaining duration
of the test.
The double -ring infiltrometer test was performed in general accordance with
ASTM D 3385. Results of the double -ring infiltrometer test for the drainage field indicates
an average infiltration rate of 0.31 inches per hour and a stabilized infiltration rate of 0.22
inches per hour. Please see Figure 2 for a graphical presentation of our test results.
SUMMIT appreciates the opportunity to provide our professional services to you on this
project. If you have any questions concerning the information in this report, or if we can
be of further service, please contact us. \\,tiiiiiirrrrt
Sincerely,
SUMMIT
Noah Sacks
Geotechnical Staff Professional
\A CARp/''%
SUMMIT•• ` ,
Engineering,
n Laboratory & s Lu
rn Testing, P.C. i X
C-4361��`
1ttrrifiilW\\
pEESSION•!y9''''�
SEAL
052284
�/ArN1 111 AO`�\\\\�.
L. Brian Cantrell, P.E.
Geotechnical Dept. Manager
Attachments: Figure 1- Test Location
Figure 2 - Double -Ring Infiltrometer Test Result
2

Report of Double Ring Infiltrometer Testing October 31, 2022
Brighton Park DRI BW #1 SUMMIT Proiect No. 8976. G0003
Figure 1- Test Location

Report of Double Ring Infiltrometer Testing October 31, 2022
Brighton Park DRI BW #1 SUMMIT Proiect No. 8976. G0003
0.450
0.400
0.350
0.300
F
D
O
Z
0.250
z
x
0.150
0.100
0.050
o.0w
Figure 2 - Infiltrometer Results
ESTATES AT MARVIN BRANCH INFILTRATION TEST
0 30 50 90 120 150 180 210
READING TIME (MI NLffES)
Average Infiltration Rate 0.22 inches/hour
Stabilized Infiltration Rate 0.31 inches/hour
tLocation 1
4