SW8040809_COMPLIANCE_20040622

STORMWATER DIVISION CODING SHEET
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June 22, 2004
BMS Architects, PC
Post Office Box 3667
Wilmington, North Carolina 28406
Attention: Mr. Bruce Bowman, AIA
Reference: Double Ring Infiltrometer Testing
Operating Room Sterile Storage Addition
Cape Fear Memorial Hospital
Wrightsville Avenue
Wilmington, North Carolina
Job No. 1063-04-305
Dear Mr. Bowman:
As requested, S&ME personnel have recently conducted double -ring infiltrometer testing of the
surficial soils at the subject site at the approximate location shown in Figure 1. Specifically, our
representative performed the following work items on June 18, 2004:
Advanced one hand-augered boring near the infiltrometer test location in order
to visually classify the in -place soils. A Munsell Soil Color Chart was used to
define the hue and chroma of the recovered soil samples.
2. Conducted one double -ring infiltrometer test at a depth of 18 inches below the
existing ground surface. This testing was conducted in general accordance with
,Krrierican Society for Testing. and -Materials (ASTM) precedurF' n-3385
entitled, "Infiltration Rate of Soils in Field Using Double -Ring lnfiltrometer".
Based on our field classifications of the excavated soils at the hand-augered boring location, the in -
place soils consist of slightly silty fine to medium sands which extended to the completed boring
depth of 98 inches below the existing ground surface. No water was noted in the borehole. The site
water level will fluctuate with climatic and seasonal conditions, however, and may be higher or
lower at other times of the year. It is our opinion that the depth to the seasonal high water table
exceeds five feet below the existing ground surface.
5&MB, Inc. (910( 799-99^_5
6409 Amsterdam Way, Bvilding 3-3 [phone] fax
i Wdrninghon, North Carolina 28405

BMS Architects, PC
S&tiIE Job Number I Obi-04-305
June 22, 2004
Page Two
The average infiltration rate at the test location was approximately 70 inches per hour. A summary
of the field test results is presented in Table 1.
SCONFE appreciates the opportunity to provide our ser'aices d^g this.phasp ofthe project. Should
you have any questions after reviewing this letter, or if we can be of additional assistance, please do
not hesitate to contact us at your convenience.
Sincerely.
S&NIE, INC.
C. Richard Connell, II
Senior Engineering Technician
Michael W. Behen, F.E.
Senior Geotechnical Engineer
CRC:Iv] WBljns
Attachments
Copy: Criser & Troutman Consulting Engineers, Mr. Don Butler, P.E.

TABLE 1
Double Ring Infiltrometer Testing
Operating Room Sterile Storage Addition
Cape Fear Memorial Hospital
Wrightsville Avenue
Wilmington, North Carolina
Job No. 1063-04-305
Date of Test: June 18, 2004
Depth of Test Below Site Grade: 18 inches
Depth of Water in Rings: 3'/2 inches
Inner Diameter of Inner Ring: 11'/4 inches
Inner Diameter of Outer Ring: 22'/z inches
Depth to Water: Not encountered
Average Infiltration Rate: 70 inches per hour
SOIL PROFILE
Depth
Inches Hue Value/Chroma Soil Description
0-12
2.5 Y
3/1
Very Dark Gray Fine to Medium SAND - Trace of Silt and
Organics
12-37
2.5 Y
4/1
Dark Gray Fine to Medium SAND - Trace of Silt
37-50
2.5 Y
5/6
Light Olive Brown Fine to Medium SAND - Trace of Silt
50-66
2.5 Y
6/4
Light Yellowish Brown Fine to Medium SAND - Trace of
Silt
66-98
2.5 Y
712
Light Gray Fine to Medium SAND - Trace of Silt

a•5
LL(_;ENI)
Approximate
Location of
Infiltrometer
Testing
HOSPITAL BUILDING
TRACT 1
AREA=17.142 Ac.�
Note: Site plan drawing provided to S&ME by ISMS Architects personnel.
SCALE: NOT TO SCALE ORSTEMLE STORAGE ADDITION FIGURE
CAPE FEA1Z MEMORIAL IIOSPfTAL
CHECKED BY: MVjIB WRIGHTSVILLE AVENUE
DRAWN BY: ,JNS WILMINGTON, NORTH CAROLINA
ENGINEERING • TESTING
DATE: 6-22-04 ENVIRONWNTAL SERVICES JOB NO. 1063-04-305

DATE ►,}ems DESIGN CRISER & TROUTMAN
Al,j f Vlilming;on. Consulting Engineers
CHECK JOB FOR
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North Carolina
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DATE DESIGN CRISER & TROUTMAN
Wilmington, Consulting Engineers
CHECK JOB FOR
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INFILTRATION BASIN -Cape Fear Memorial Hospital
No.
5359
Date:
24-.1un-04
Basin Information
Impervious Surface Areas
Drainage Area 3,367 sf
0.08 ac On -site Buildings
3,367 sf
0.08 /%
Existing Impervious Area 1,155 sf
0.03 ac On -site Streets
0 sf
0.00
Proposed Impervious Area 2,212 sf
0.05 ac On -site Parking
0 sf
0.00
On -site Sidewalks
0 sf
0.00
% Built -upon Area (C) 100,00
Other on -site
0 sf
0.00
Totals
3,367 sf
0.08
Soils Type= Urban
Ur on page 19
Infiltration Rate= 35,0 inlhr
(Factor of Safety = 2)
Depth to Ground Water= 5 feet below surface, minimum
Required Volume: (Simple Method)
Design Storm= 1 in
Determine Value Rv= 0.05+0.009 (1)
0.95 in/in
Minimum Volume Reqd.= Rainfall x Rv
Acres x 43560
12"
Minimum Volume Regd.= 276 cf
Trench Design
Perf. Pipe
24 in_ dia.
Pipe Length
42 ft
Trench Dim.
3 ft. high
4 ft. wide
Stone void
0A
Vol./ ft. pipe
Z
6.68 cf ✓ �2�e� '
ZC,2t��
Drawdown time= 0.6 hrs t
Prov1,c e& votum.- =
10ffi-%StortttwatertStale Wei Pond