20091020 Ver 2_More Info Received_20110128

G (? - 10 4-o ua-
770-447-8999
770-447-9070 Fax
www.wolverton-assoc.com
6745 Sugarloaf Parkway ? Suite 100
Duluth, Georgia 30097
Wolverton & Associates
LETTER OF TRANSMITTAL
DATE: January 26, 2011 W&A PROJECT NO.: 07-2301210
TO: Joseph Gyamfi / Ian McMillan 919-807-6301
NCDENR Div. of Water Quality
401 Express Permitting Unit Lei `2 1?9 L% U
2321 Crabtree Blvd., Suite 250 JAN 9 a ??j
Raleigh, NC 27604
ANDSTO?yq? o??---
RE: Grandview Station Shopping Center
COPIES DATED DESCRIPTION
2 1/25/11 Stormwater Liner Revision Package
TRANSMITTED:
MAIL COURIER DELIVERED
FED EX 1/26/11S PICKED UP OTHER
MESSAGE: Joseph / Ian,
The Contractor tested the materials available onsite and stockpiled the clays with the best hydraulic
conductivity for use in the fill areas of the pond. Since the pond has been built, they have been monitoring
the water levels, and it appears to be maintaining at a constant level. Given the fact that the water level
has been holding constant, the Developer would like to request to leave the pond as installed. Please feel
free to contact me at 770-447-8999 to discuss this request.
COPY: Bo Murphy, WRS, Inc. via email SIGNED
41azit",IAJA
Chris Manes, P.E., C SCjar
A
i
Wolverton & Associates
January 25, 2011
Mr. Joseph Gyamfi, P.E.
Environmental Engineer
NCDENR Division of Water Quality
401 Express Permitting Unit
2321 Crabtree Blvd., Suite 250 (? n
Raleigh, NC 27604 U 14N 8 201,
RE: Stormwater Pond Construction at the
Grandview Station Shopping Center, Marion, NC dENR - WATER QUALITY W&A Project No. 07-230 "'?Tl.ANDSANDSTORMWATERBRAXH
Dear Mr. Gyamfi:
In regards to the stormwater management pond at the referenced site, I am providing this update of the
status of the stormwater basin. When we last spoke you mentioned that we may be able to eliminate the
need for an artificial pond liner if it could be demonstrated that the stormwater pond could operate in a
satisfactory manner. After performing a geotechnical analysis on several soil deposits onsite, the soils
chosen for the pond berm construction had a permeability ranging from 1.3 x 10-6 to 7.8 x 10-6. These
materials were used in the core of the berm at a width of 12 feet from the bottom of the key to within 2
feet of the top of the berm. The remaining soils were a mixture of these soils with other clays found onsite.
The pond construction was completed the first part of November and the impounded water reached the
permanent pool level around the middle of November. Since this time the Contractor has been monitoring
the water surface elevation to detect any fluctuations. As of this week the permanent pond has maintained a
constant level with little-to-no fluctuations. Additionally, the rainfall gauge at the site recorded total
rainfall data that was in accordance with the average monthly rainfall for Marion, NC. Based on this data, it
is my opinion that the current operation of the pond meets the intent of the ordinance. Therefore, I am
requesting your approval to eliminate the need for the artificial pond liner. Should you have any questions,
please call me to discuss.
I appreciate your consideration of this request.
Sincerely,
WOLVERTON & ASSOCIATES, INC.
ristophcr L. Manes, PE, CPESC
CLM:jar
Enclosures: Permeability Test Results
6745 Sugarloaf Parkway ? Suite 100 ? Duluth, Georgia 30097 ? 770-447-8999 ? 770-447-9070 Fax
www.wolverton-assoc.com
SiME FLEXIBLE WALL PERMEABILITY TEST REPORT
(ASTM D 5084)
A
ki
AAS TO R19
REVO,11119W
JOB NAME : Walmart No. 1694-05
JOB NO. : 1413-10-044 REPORT NO. N/A DATE: 07/12/10 REVIEWED BY
BORING / PIT: N/A DEPTH I ELEV. N/A SAMPLE NO. - SAMPLE TYPE: Bulk
SAMPLE LOCATION: Basin no.1 ke ay-Westside Core 1 @ 1'-2' DIAMETER, INCHES 2.82
SOIL DESCRIPTION : Red lean clay with sand. LENGTH, INCHES : 3.00
LIQUID LIMIT, % 45 PLASTICITY INDEX %% 19 FINES , % 76 SPECIFIC GRAVITY, Gs 2.72

SPECIMEN PROPERTIES
INITIAL

MOISTURE CONTENT W 20
1
9,0E-06 o . %

H 8.0E-06
U DRY BULK DENSITY 98
2 pcf
7.0E-06 ynry° .

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2 %
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5.0E-06
C VOID RATIO e 0
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Y 4.0E-06 o .
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. AFTER CONSOLIDATION
0E 06
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1.0E-06 MOISTURE CONTENT W,, 27.8 %
0.0 2.0 4.0 6.0 8.0
FLOW IN PORE VOLUMES, PV (%) DRY BULK DENSITY
Ydry? 98.8 pcf
SATURATION S; 100 %
b1? .. O ILL{ ?'?? VOID RATIO e? 0.715
7.8E-06 t .._ .? : sue= PERMEATION
FINAL BACK PRESSURE uo 70.0 psi
EFFECTIVE CONSOLIDATION
PRESSURE M, 5.0 psi
ASTM D4767-Note 11 :
It is common for the unit weight of the specimen after removal from PORE PRESSURE DIFFERENCE
TO INDUCE FLOW Duo 0.5 psi
the mold to be less than the value based on the volume of the mold. HYDRAULIC GRADIENT i 5
This occurs as a result of the specimen swelling after removal of QUANTITY OF FLOW Q 9.4 cm3
the lateral confinement due to the mold. TOTAL PORE VOLUME PV 7.3

PERMEANT PROPERTIES REMOLDED SOIL PROPERTIES

PERMEANT DESCRIPTION

Deaired Tap Water
@ 22 °C The specimen was remolded to 95% of maximum
dry density (standard) at about -0.3% of
optimum moisture content.
(AS TM D 698)
+ means wet of optimum
- means dry cf optimum
MAXIMUM DRY DENSITY : 103.7 PCF
OPTIMUM MOISTURE CONTENT : 20.4 %
MOISTURE I DENSITY RELATIONSHIPS OF SOIL
_ (ASTM D 698) PROJECT Walmart No. 1694-05 REVIEWED BY:
CLIENT : - DATE SAMPLED 07106/10 SAMPLED BY DM
JOB NO. 1413-10-044 REPORT NO. N/A TEST DATE : 07/08/10
SAMPLE LOCATION Basin no.1 ke a -Westside Core 1 @ 1'-2' SAMPLE NO. NIA IN-SITU M .C , , %: N/A
SOIL DESCRIPTION ; Red lean clay with sand.
PROCTOR TYPE STANDARD PROCEDURE B +3/4" 0
LIQUID LIMIT, % 45 PLASTICITY INDEX, % 19 FINES, % 76 USCS : CL AASHTO NIA
UNCORRECTED CORRECTED
MAXIMUM DRY DENSITY, PCF : 103.7 MAXIMUM DRY DENSITY, PCF : 903.7
OPTIMUM MOISTURE CONTENT, % : 20.4 OPTIMUM MOISTURE CONTENT, % : 20.4
125.0 T - - _.. -•- _.._.. _ - - - --r-- - - T-
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MOISTURE CONTENT
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REV1,SA 0106 PASHTO Rye
JOB NAME Walmart No. 1694-05
JOB NO. : 1413-10-044 REPORT NO. N/A DATE 07/08/10 REVIEWED BY
BORING/ PIT NO. N/A DEPTH / ELEV. N/A SAMPLE NO. N/A SAMPLE TYPE Hulk
SAMPLE LOCATION Basin no.1 keywa -Westside Core 1 @ 1'-2'
SOIL DESCRIPTION Red lean cla with sand.
LIQUID LIMIT, % 45 PLASTICLIMIT,%: 26 PLASTICITY INDEX,%: 99 MOISTURE, % N/A
CLASSIFICATION : UNIFIED CL AASHTO - FINES, % 76

LIQUID LIMIT , % MOISTURE AT THE ARBITRARY DEFINED BOUNDARY BETWEEN LIQUID & PLASTIC STATES --
% MOISTURE AT WHICH SOIL FLOWS FOR A DISTANCE OF 13 MM (112 ") AT THE BASE OF GROOVE WHEN SUBJECTED TO 25 BLOWS
TEST NO, : 1 2 3 4 5
CONTAINER NO. 35 36 44 BRAND MODEL SERIAL
NUMBER OF BLOWS 22 28 16 BALANCE PRECISA 22000
WT. WET SOIL + CAN (GRAMS) 28.47 26.36 29.73 LL MACHINE HUM13OLT 1
WT. DRY SOIL +CAN (GRAMS) 24.49 22.67 24.90 BALANCE CHAUS-31000 ARC120
WT. OF WATER (GRAMS) 3.98 3.49 4.83 OVEN 0E9PATCH-306 1650032533
WT. OF CONTAINER GRAMS) 15.90 15.02 15.01
WT. OF DRY SOIL (GRAMS) 8.59 7.85 9.89
WATER CONTENT, (%) 46.33 44.46 48.84
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NUMBER OF BLOWS, N
PLASTIC LIMIT MOISTURE AT THE ARBITRARY DEFINED BOUNDARY BETWEEN PLASTIC & BRITTLE STATES --
% MOISTURE AT WHICH SOIL CAN NO LONGER BE DEFORMED BY ROLLING INTO 3.2 MM (11$" )IN DIAMETER THREADS WITHOUT CRUMBLING
TEST NO, : 1 2 3 4 5
CONTAINER NO. 45 47
WT. WET SOIL + CAN (GRAMS) 23.56 23.41
WT, DRY SOIL + CAN (GRAMS) 21.85 21,80
WT. OF WATER (GRAMS) 1.71 1.61
WT. OF CONTAINER (GRAMS) 15.19 15,62
WT. OF DRY SOIL (GRAMS) 6.66 6.18
WATER CONTENT, (%) 25.68 26.05

PLASTICITY INDEX - THE RANGE OF % MOISTURE CONTENT OVER WHICH :TOIL BEHAVES PLASTICALLY -
THE DIFFERENCE BETWEEN LIQUID LIMIT & PLASTIC LIMIT PI = LL - PL

$&ME FLEXIBLE WALL PERMEABILITY TEST REPORT

( ASTM D 5004) 5M
If ART
M511TO 1115
REV°,1 I 119102
JOB NAME : Walmart No. 1694-05
JOB NO. : 1413-10-044 REPORT NO. NIA DATE: 07/19/10 REVIEWED BY :
BORING / PIT: N/A DEPTH t ELEV. N/A SAMPLE NO. - SAMPLE TYPE: Bulk
SAMPLE LOCATION: Core 4 DIAMETER, INCHES 2.83
SOIL DESCRIPTION : Reddish brown fat clay with sand CH LENGTH, INCHES : 3.00
LIQUID LIMIT, % 58 PLASTICITY INDEX, % 29 FINES, % : 78 SPECIFIC GRAVITY, Gs 2,72

SPECIMEN PROPERTIES
INITIAL
9.0E 06 - - - MOISTURE CONTENT W

H 8
0E - - - ° 23.5 %
.
-06

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r -- - - - - - - -
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- MOISTURE CONTENT W° 39.6 %
0.0 2.0 4.0 6.0 8.0 10.0
FLOW IN PORE VOLUMES, PV (%) DRY BULK DENSITY
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pct
_ SATURATION S° 100 %
M"i 14? 5 i : I 3°'i

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VOID RATIO
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2.5E-06 c h` PERMEATION
FINAL BACK PRESSURE u° 70.0 psi

ASTM D4767
N EFFECTIVE CONSOLIDATION
PRESSURE CT-1 5.0 psi
-
ote 11 :
It is common for the unit weight of the specimen after removal from PORE PRESSURE DIFFERENCE
TO INDUCE FLOW Auo 0.5 psi
the mold to be less than the value based on the volume of the mold. HYDRAULIC GRADIENT i 5
This occurs as a result of the specimen swelling after removal of QUANTITY OF FLOW Q 12.7 Cm3
the lateral confinement due to the mold. TOTAL PORE VOLUME PV 9.3 %
PERME
ANT PROPERTIES REMOLDED SOIL PROPERTIES

PERMEANI' DESCRIPTION

Deaired Tap Water
@ 22 °C The specimen was rernolded to 95% of maximum
dry density (standard) at about + 0.7% of
optimum moisture content.
(AS TM D 698)
+ means wet of optimum
- means dry of optimum
MAXIMUM DRY DENSITY 99.1 PCF
OPTIMUM MOISTURE CONTENT 22.8 %
dML AM
all MOISTURE / DENSITY RELATIONSHIPS OF SOIL
(ASTM D 698)
PROJECT Walmart No. 1694-05 REVIEWED BY :
CLIENT : - DATE SAMPLED 07108110 SAMPLED BY DM
JOB NO. 1413-10-044 REPORT NO. N/A TEST DATE : 07/13/10
SAMPLE LOCATION Core 4 SAMPLE NO. N/A IN-SITU M. C. , % : N/A
SOIL DESCRIPTION Reddish brown fat clay with sand.
PROCTOR TYPE STANDARD PROCEDURE B +3/4" 0
LIQUID LIMIT, % 58 PLASTICITY INDEX, % 29 FINES, % 78 USCS CH AASHTO NIA
UNCORRECTED CORRECTED
MAXIMUM DRY DENSITY PCF ; 99.1 MAXIMUM DRY DENSITY, PCF ; 99.1
OPTIMUM MOISTURE CONTENT, % 22.8 OPTIMUM MOISTURE CONTENT, % 22.8
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ATTERBERG LIMITS
#S&ME (ASTM D 4318 )
REV,, 0110106
AkR
AASHTO RIB
JOB NAME Walmart No. 1694-05
JOB NO. : 1413-10-044 REPORT NO. N/A DATE : 07/20/10 REVIEWED BY
BORING / PIT NO. : N/A DEPTH I ELEV. N/A SAMPLE NO. N/A SAMPLE TYPE ulk
SAMPLE LOCATION Core 4
SOIL DESCRIPTION Reddish brown tat clay with sand.
LIQUID LIMIT, % 58 PLASTIC LIMIT,% : 29 PLASTICITYINDEX,% : 29 MOISTURE, % N/A
CLASSIFICATION UNIFIED : CH AASHTO : - FINES, % 78

LIQUID LIMIT , % MOISTURE AT THE ARBITRARY DEFINED BOUNDARY BETWEEN LIQUID & PLASTIC STATES --
% MOISTURE AT WHICH SOIL FLOWS FOR A DISTANCE OF 13 MM (112 ") AT THE BASE OF GROOVE WHEN SUBJECTED TO 25 BLOWS
TEST NO. : 1 2 3 4 5
CONTAINER NO. 32 35 36 BRAND MODEL SERIAL
NUMBER OF BLOWS 32 26 15 BALANCE PRECISA 22000
WT. WET SOIL + CAN (GRAMS) 21.48 27.15 27.87 ILL MACHINE HUMBOLT 1
WT. DRY SOIL + CAN GRAMS 23.09 23.10 22.92 BALANCE OHAUS-3100G ARC120
WT. OF WATER (GRAMS) 4.39 4.05 4.95 cvEN DESPATCH-3438 1650032533
WT. OF CONTAINER GRAMS 15.18 15.97 15.10
WT. OF DRY SOIL GRAMS 7,91 7.13 7.82
WATER CONTENT, (%) 55.50 56.80 63.30
160
0
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.

1 10 20 25 30 40 100
NUMBER OF BLOWS, N
PLASTIC LIMIT , % MOISTURE AT THE ARBITRARY DEFINED BOUNDARY BETWEEN PLASTIC & BRITTLE STATES --
% MOISTURE AT WHICH SOIL CAN NO LONGER BE DEFORMED BY ROLLING INTO 3.2 MM (1/8" )IN DIAMETER THREADS WITHOUT CRUMBLING
TEST NO. : 1 2 3 4 5
CONTAINER NO. 37 38
WT. WET SOIL + CAN GRAMS 22.02 21.99
WT. DRY SOIL + CAN GRAMS 20.59 20.49
WT. OF WATER GRAMS 1.43 1.50
WT. OF CONTAINER GRAMS 15.69 15.25
WT. OF DRY SOIL GRAMS 4.90 5.24
WATER CONTENT, (%) 29.18 28.63

PLASTICITY INDEX - THE RANGE OF % MOISTURE CONTENT OVER WHICH SOIL BEHAVES PLASTICALLY -
THE DIFFERENCE BETWEEN LIQUID LIMIT & PLASTIC LIMIT PI = LL - PL

f$&ME FLEXIBLE WALL PERMEABILITY TEST REPORT
(ASTM D 5084) AMR
REV0,11119/°2 AASHTO R10
JOB NAME : Waimart No. 1694-05
JOB NO. : 1413-10-044 REPORT NO. N/A DATE: 07/20/10 REVIEWED BY
BORING / PIT: N/A DEPTH I ELEV. N/A SAMPLE NO. - SAMPLE TYPE: Bulk
SAMPLE LOCATION: Core 3 DIAMETER, INCHES 2.83
SOIL DESCRIPTION :Reddish brown fat clay with sand( CH LENGTH, INCHES 3.01
LIQUID LIMIT, % 64 PLASTICITY INDEX , % 32 FINES , % : 75 SPECIFIC GRAVITY, Gs 2.69

SPECIMEN PROPERTIES
INITIAL

MOISTURE CONTE W
9.0E-06 NT ° 24.8 %

a
oE-o6
. DRY BULK D
_ ENSITY Ytl 91.0 pcf
7.0E-06 na
ow _
z CO
6
0E-06 SATURATION S
.
o ° 79.0 %
V -
5.0E-06
v VOID RATIO
- 4
0E-06 e° 0.845
.
J ?

3.0E-06
AFTER CONSOLIDATION
n 2
0E-06
.
_
1.0E-06

MOISTURE CONTENT

W°

32.5
%
0.0 1.0 2.0 3.0 4.0 5.0 6.0
FLOW IN PORE VOLUMES, PV (%) DRY BULK DENSITY
7`y? 91.6 cf
p
SATURATION S° 100 %
VOID RATIO e 0.833

1.3E-06 PERMEATION
FINAL BACK PRESSURE u° 70.0 psi
EFFECTIVE CONSOLIDATION
PRESSURE 5.0 psi
AS TM D4767-Note I9 :
It is common for the unit weight of the specimen after removal from PORE PRESSURE DIFFERENCE
TO INDUCE FLOW Auo 0.5 psi
the mold to be less than the value based on the volume of the mold. HYDRAULIC GRADIENT i 5
This occurs as a result of the specimen swelling after removal of QUANTITY OF FLOW Q 7.3 cm3
the lateral confinement due to the mold. TOTAL PORE VOLUME PV 5.2 %

PERMEANT PROPERTIES REMOLDED SOIL PROPERTIES

PERMEANT DESCRIPTION

Deaired Tap Water
@ 22 °C The specimen was remolded to 95% of maximum
dry density (standard) at about + 0.0% of
optimum moisture content.
(ASTM D 698)
+ means wet of optimum
- means dry of optimum
MAXIMUM DRY DENSITY : 97,1 PCF
OPTIMUM MOISTURE CONTENT 24.8 %
fS&ME MOISTURE / DENSITY RELATIONSHIPS OF SOIL
(ASTM D 698)
.wenro me
PROJECT Walmart No. 1694-05 REVIEWED BY
CLIENT : - DATE SAMPLED : 07108/10 SAMPLED BY DM
JOB NO. 1413-10-044 REPORT NO. N/A TEST DATE 07113/10
SAMPLE LOCATION Core 3 SAMPLE NO. N/A /N-SITU M. C. N/A
SOIL DESCRIPTION Reddish brown fat clay wlth sand.
PROCTOR TYPE STANDARD PROCEDURE B +314" 0
LIQUID LIMIT, % 64 PLASTICITY INDEX, % 32 FINES, % 75 USCS : CH AASHTO N/A
UNCORRECTED CORRECTED
MAXIMUM DRY DENSITY, PCF : ' 97.1 MAXIMUM DRY DENSITY, PCF : 97.1
OPTIMUM MOISTURE CONTENT,% 24.8 OPTIMUM MOISTURE CONTENT, % 24.8
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$S&ME ATTERBERC LIMITS
( ASTM D 4318 )
REV,,511 V00 PASHTO R18
JOB NAME Walmart No. 1694-05
JOB NO. : 1413-10-044 REPORT NO. N/A DATE 07/2.0/10 REVIEWED BY
BORING I PIT NO. : N/A DEPTH I ELEV. N/A SAMPLE NO. N/A SAMPLE TYPE Buik
SAMPLE LOCATION Core 3
SOIL DESCRIPTION Reddish brown fat cla with sand.
LIQUID LIMIT, % 64 PLASTIC LIMIT,%: 32 PLASTICITY INDEX,%: 32 MOISTURE, % NIA
CLASSIFICATION : UNIFIED CH AASHTO : - FINES, % 75

LIQUID LIMIT , % MOISTURE AT THE ARBITRARY DEFINED BOUNDARY BETWEEN LIQUID & PLASTIC STATES --
% MOISTURE AT WHICH SOIL FLOWS FOR A DISTANCE OF 13 MM (112 ") AT THE BASE OF GROOVE WHEN SUBJECTED TO 25 BLOWS
TEST NO. 1 2 3 4 5
CONTAINER NO. 44 45 47 BRAND MODEL SERIAL
NUMBER OF BLOWS 34 25 18 BALANCE PRECISA 22000
WT. WET SOIL + CAN (GRAMS) 27.85 28,08 2$.42 LLMACHINE HUMBOLT 1
WT. DRY SOIL + CAN (GRAMS) 23.09 23.12 23.2$ BALANCE CRAUS-310D C ARC120
WT. OF WATER (GRAMS) 4.76 4.96 5.14 OVEN DESPATCH-3436 1650032533
WT. OF CONTAINER (GRAMS) 15.10 15.29 15.71
WT. OF DRY SOIL (GRAMS) 7,99 7.83 7.57
WATER CONTENT, (%) 59.57 63.35 67.90
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NUMBER OF BLOWS, N
PLASTIC LIMIT , % MOISTURE AT THE ARBITRARY DEFINED BOUNDARY BETWEEN PLASTIC & BRITTLE STATES --
% MOISTURE AT WHICH SOIL CAN NO LONGER BE DEFORMED BY ROLLING INTO 3.2 MM ( 118" )IN DIAMETER THREADS WITHOUT CRUMBLING
TEST NO. 1 2 3 4 5
CONTAINER NO. 48 49
WT. WET SOIL + CAN (GRAMS) 22.12 22.19
WT. DRY SOIL + CAN ( GRAMS) 20.49 20.56
WT. OF WATER GRAMS 1.63 1.63
WT. OF CONTAINER GRAMS 15.36 15.35
WT. OF DRY SOIL (GRAMS) 5.13 5.21
WATER CONTENT, (%) 31.77 31.29

PLASTICITY INDEX - THE RANGE OF % MOISTURE CONTENT- OVER WHICH SOIL BEHAVES PLASTICALLY -
THE DIFFERENCE BETWEEN LIQUID LIMIT & PLASTIC LIMIT PI = LL - PL