HomeMy WebLinkAboutSW3240702_Soils/Geotechnical Report_20240801 CEST
Civil - Geotechnical - Surveying
May 23, 2024
Mr. Randy Humphries
Performance Precast, Inc.
Reference: Seasonal High-Water Table Determination
Proposed PPI Office and Welding Site
70 Zane Road
Midland, Cabarrus County, North Carolina
CESI Project Number 240260.000
Mr. Humphries:
In accordance with your request, Concord Engineering & Surveying, Inc. (CESI) has
performed an evaluation of seasonal high-water table (SHWT) on the above referenced
project. The SHWT was performed within the area of the proposed sand filter, as shown
below:
il
DS-1
RIM.693.00
15' INV OUT(N):686.53 0
d
Ilk :72C''
98.L
SHWT O
Test Location - cv
0
1Y) 1�
CO in rn co BUILDING F.F.E. 141.31'/15' RCP/0.501
cn< `O 698.50
r
i f J
FEs-1
INV OUT: 689.19
^ 161.51715.RCP 0.50E
'--r i
1 73.92718'RCP/0.50% -
\ __.,-
RIM-1 ��,
RIM:693.08 1�.\��
1•
6", /18" IN�(..OUTS(E)6 89.56` \ - `
45 Spring Street, SW P.O. Box 268 Concord, NC 28026-0268 704-786-5404
www.cesicgs.com NC License No. C-0263
On May 22, 2024, a CESI representative monitored the excavation and the soil horizon at the
above referenced location.At the proposed test location, a Hyundai 235 excavator owned and
operated by Randall Site Services, was used to excavate to a depth of 11' below existing
ground surface.
The soil horizon encountered at the excavation included:
• 2" of grass and topsoil,
• 15" of brown and gray moderately plastic silty CLAY (CL),
• 38" of brown, yellow and gray clayey SILT (ML) with sand and gravel,
• 67" of WEATHERED ROCK sampled as brown , yellow and gray SILT (ML) with
seams of harder WEATHERED ROCK
• No water was recorded at the time of excavation.
• No indications of groundwater were observed to the depths explored.
On May 23, 2023, CESI returned to the site to observe the conditions within the excavation.
No water was observed in the excavation. As a result of our site observations, we offer the
following:
Sand Filter Seasonal Hiqh-Water Table
Ground Elevation at Test Location Elevation 694.0
Bottom of Excavation Elevation 683.0
Water Level Elevation not encountered
Bottom of Proposed SCM 689.0
Bottom Sand Filter System Elevation 685.0
24" Buffer Requirement Elevation 683.0
Based on our observations it was determined that the seasonal high
groundwater elevation at the proposed sand filter location is deeper than
683.0.
The seasonal highwater elevation supports the use of a sand filter at this
location and elevation.
45 Spring Street, SW P.O. Box 268 Concord, NC 28026-0268 704-786-5404
www.cesicgs.com NC License No. C-0263
We appreciate the opportunity to be of service to you and we look forward to helping you
through project completion. If you have any questions, please feel free to call.
Respectfully submitted,
.\
\`‘�N CA R p��.,,,
oFEsS/0 ( tiq'-
SE
AL 24
James G. (Jay) Eaves III, PE
Division Engineer
45 Spring Street, SW P.O. Box 268 Concord, NC 28026-0268 704-786-5404
www.cesicgs.com NC License No. C-0263