SW8031024_COMPLIANCE_20030904

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO. SW
FDOC TYPE ❑ CURRENT PERMIT
❑APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION j
DOC DATE
YYYYMMDD

�,0033 y9.7a Cam)
ENGINEERING CONSULTING SERVICES, LTD.
Geotechnical Construction Materials t, Environmental
Mr. Monte Rosenberger
Zimmer Development Co.
l I I Princess Street
Wilmington, North Carolina 28401
RE: Report of Inliltration l-'valuauon
Eckerd Pharmacy — College Rd. & Shipyard Blvd.
Wilmington, North Carolina
Dear Mr. Rosenberger,
September 4, 2003
ECS, Ltd. Project No. 22.1065913
Engineering Consulting Services, Ltd. (ECS) recently conducted an infiltration evaluation for
the Eckerd Pharmacy located off of College Road and Shipyard Boulevard in Wilmington;
North Carolina. This letter, with attachments, is the report of our investigation.
Field Investigations
On September 3, 2003, ECS conducted an investigation of the subsurface soil and ground water
conditions at the location indicated on the provided Site Sketch. The infiltration test location
was selected by Mr. Michael -Newman of PM Engineering and located in the field by an ECS
representative. Tile purpose of our investigation was to determine the infiltration rate of the
subsurface soils at the test location. We investigated the subsurface soil and ground water
conditions by drilling one hand auger borings to the.depth of approximately seven feet below
the existing ground surface at the approximate location indicated on the site sketch. We
visually classified the subsurface soils. The attached Infiltration Evaluati011 Form provides a
summary of the subsurface conditions encountered at the hand auger boring location and the
results of our infiltration test.
Our field classifications indicate that the subsurface soils at the test location consisted of gray
silty fine to medium sand strata. Ground water was encountered at 60.,inches below existing
grade.
We conducted one infiltration tests near the hand auger boring location. The infiltration test
was conducted within the upper stratum of sands, where the base of an infiltration system will
be installed at least 24 inches above seasonal high ground water levels. The infiltration test was
performed at a depth of approximately 36 inches below existing grade. The results of the test
are summarized on the attached Infiltration Evaluation sheets and are also listed below.
P. O. Box 10434, Wilmington, NC 28404 . (910) 686-91 IA . FAX [phone] . 1.800-327-5832 • -Incksonville, NC [phone] • www.ccslimited.com
Aberdeen, MD, • Atlanta, GA • Austin, TX - Baltimore, ,MD - Chantilly. VA - Charlotte, NC - Chicago. IL Cornelia, GA' Dallas, TX - Danville. VA' Frederick. 411) - Fredericksburg, VA
Greensboro, NC - Greenville, SC - Norfolk, VA - Research Triangle Park, NC - Richmond. VA • Roaroke. VA • San Antonin. TX - Williamsburg, VA Wihninetm NC Winchester. VA
`'resting services C)nl_V

htliltrcition Evaluation
Fcurd Phamincy
Wilmington, Not 11)C m-ohnn
FCS Noicc;l No. 22.It165913
Evaluations
Based on observations, it is our c►pinion that the seasonal high ground water level at the test
location is approximately 60 inches below existing grade.
In order to keep the base of the infiltration system at least 24 inches above the level of the
seasonal high ground water levels, the infiltration system will need to extend no deeper than 36
inches helow existing grade at the infiltration test location. Such installation depth will place
the base of the infiltration system within the upper stratum of moderately-drainable sands. Our
test results indicate that the infiltration rate for these materials is 1.5 inches per minute at the
test location. It is likely that the seasonal high groundwater conditions and infiltration rates can
vary across the site clue to naturally occurring soil type and because of the surface topography.
If you have any questions regarding this report, please do riot hesitate to contact tls.
Respectfully,
ENGINEERING CONSULTING SERVICES, LTD.
Winslow Goins, E.I.
Staff Engincer
CC: Mr. Michael Newman
Attachments: Site Sketch
Infiltration Evaluation
r
Walid M. Sobli P. E�..
Principal Engineer
NC License No. 22983.-

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RpR� LOCATION OF INFILTRATION I"95-T
--- _----------------------- -----L ----------------------------------------------
----___-_.- - - - - - - - - - - - - - --------------_-------------------------- - - - -
SOUTH COLLEGE ROAD (HIGHWAY 132) ,
FIGURE 1 I
SCALE (IN FEET)
REFERENCE:
C41i�LTD
BORING LOCATION PLAN
40 80
SITE PLAN PROVIDED BY
ECKERD'S PHARMACY
ZIMMER IN ELECTRONIC
FORMAT
WILMINGTON, NORTH CAROLINA
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ENGINEERING
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FMILCT ,ND.
22-lb659
SERVICES,LTD

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En gineerint; Consulting Services, Ltd.
.lob Number: 10659-B
Job Name: Ickerd Phani-lacy
Contractor:
Infiltration Evaluation
location; Wilmington, NC
Hand
Auger
Location
Date
Depth/
Elevation
Soil Classification
Blows
Remarks
l
9/3/03
0-1 H"
'Gray Fine to Medium SAND
19-60"
Gray Silty Fine to Medium SAND
Infiltration Test rn 36"
Rate = 1.5 in/min
00-72"
Brown Fine to MCdiUnl SAND
Seasonal High Water Level at GO"
72-84"
Gray Fine to Medium SAND