WI0700012_Corrective Action Plan_19891106

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Supplemental Remedial Action Plan
Tank Farm Area
Texasgulf Inc.
Phosphate Operations
Aurora, North Carolina
Ardaman & Associates, Inc.
OF=:C7=S
WgSH NGTON OFF/CF
/NOS 61989
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Orlando. 8008 S. Orange Avenue, P.O. Box 593003. Orlando. Florida 32859-3003, Phone [phone]
Bartow, 1987 S. Holland Parkway, P.O. Box 812. Bartow. Florida 33830. Phone [phone]
Bradenton, 209 A 6th Avenue East. P.O. Box 1335, Bradenton. Florida 33508. Phone [phone]
Cocoa, 1300 N. C,nc 3tvr+ ° D Sox 1E57 Cocca ="cr da .'_2924. Phone [phone]
Fort Myers, 2508 Rockiiil Road. Fort Myers, Florida 33916, Phone [phone]
Miami, 2608 'N. 84th Street, Hialeah. Florida 33016, Phone i305) 825-2683
Port St. Lucie, 1017 S.E. Holbrook Ct., P.O. Box 8687, Port St. Lucie. Florida 34985. Phone r407) 337-1200
Sarasota, 2500 Bee Ridge Road. P.O. Box 15008. Sarasota. Fonda 34277 Phone [phone]
Tallahassee, 3175 West Tharpe Street, Tallahassee. Florida 32303, Phone [phone]
Tampa. 105 N. Faulkenburg Road, Suite D. P.O. Box 1506. Brandon, Florida 34299-1506. Phone [phone]
West Palm Beach, 2511 Westgate Avenue, Suite 10, West Palm Beach. Florida 33409, Phone [phone]
MEMBERS:
American Concrete 'ns:lute
American Society for Testing and Materials
American Consulting Engineers Council
Association of Soil and Foundation Engineers
Florida Institute of Consulting Engineers
Professional Engineers in Private Practice

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Ardaman & Associates, Inc.
Consultants in Soils, Hydrogeology,
Foundations and Materials Testing
Texasgulf Inc.
Post Office Box 48
Aurora, North Carolina 27806
Attention: Mr. William A. Schimming, Manager
Environmental Affairs
October 31, 1989
File Number 88-089
Subject: Supplemental Remedial Action Plan, Tank Farm Area, Texasgulf
Phosphate Operations, Aurora, North Carolina
Gentlemen:
As requested, we have completed a supplemental remedial action plan for the tank farm
area in accordance with the requirements of the notice of violation issued by the Division
of Environmental Management on September 1, 1989 in response to the underground
drain line leak incident. The document presents: (i) an overview of reported leak
incidents at the tank farm and status of the previously submitted remedial action plan; (ii)
a description of the hydrogeology of the tank farm area and implications on containment
migration; (iii) a characterization of groundwater quality in the tank farm based upon
three quarterly sampling events and (iv) a supplemental remedial action plan to contain
and clean-up the existing groundwater contamination.
If you have any questions or require additional information, please contact us.
Very truly yours,
ARDAMAN & ASSOCIATES, INC.
CC..
Thomas S. Ingra, P.E.
Senior Project Engineer
hn E. Garlanger, h.D., P.E.
Principal
North Carolina Registration No. 9046
TSI:sc
Encls.
BOOB 5. Orange Avenue, P.O. Box 593003. Orlando. Florida 32859-3003 [phone] - FAX I, 407 855-219
Offices in. Rarinw Rradnnrn, rnrn.

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Table of Contents
Section
Title Page
ACTION PLAN 4-1
4 SUPPLEMENTAL REMEDIAL
4.1 Introduction 4-14-1
4.2 Objectives of Supplemental Remedial Action
Plan
4.2.1 Installation of New Containment
4-1
Facilities 4 2
4.2.2 Installation of Cut -Off Wall 4-3
4.2.3 Installation of Dewatering Wells
4.3 Time Schedule for Implementation of
4-3
Supplemental Remedial Action System 4-4
4.4 Groundwater Monitoring for Evaluation of
Remedial Action System
a

Figure
List of Figures
Title
1-1 Tank Farm Site Plan
1-2 Pumping Record and Groundwater Quality at Well -Point Dewatering System
2-1 Monitor Well Location Plan
2-2 Schematic of Monitor Well Installation
2-3 Generalized Subsurface Stratigraphy
2-4 Water Table Elevation in Surficial Sand Layer
2-5 Potentiometric Surface Map for Confined Sand Layer
2-6 Potentiometric Surface Map for Croatan Formation
2-7 Water Level Elevation Versus Depth
3-1 Groundwater Quality in Surficial Sand Layer
3-2 Groundwater Quality in Confined Sand Layer
3-3 Groundwater Quality in Croatan Formation
4-1 Cut -Off Wall and Dewatering Well Containment System Conceptual Site Plan
4-2 Schematic Cross Section of Cut -Off Wall and Dewatering Well Containment
System
4
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Texasgulf Inc.
File Number 88-089 1-1
Section 1
OVERVIEW OF TANK FARM LEAK INCIDENTS
AND REMEDIAL ACTION PLAN
1.1 Tank Leak Incident at Tank 008
On May 31, 1988 during repair and maintenance of an above ground phosphoric acid
storage tank, designated Tank 008 (Figure 1-1), it wasdiscoveredthat the rubber liner
within the tank was damaged at two locations allowing the loss of an undetermined amount
of 54 percent ;phosphoric acid over an unknown length of time. Shallow excavations
beneath .the tank floor revealed the accumulation of phosphoric acid within soils underlying
the tank.
The phosphoric acid stored within the tank is characterized by the following chemical
constituents:
Constituent Concentration
• Inorganic Constituents (%)
Phosphorus, P205
Sulfate, SO,
Magnesium, MgO
Iron, Fe203
Aluminum, A1203
Fluoride, F
Calcium, CaO
Chloride, CI
Silica, SiO2
• Trace Metals (mg/1)
52.8
2.6
1.3
1.3
0.6
0.5
0.05
0.005
0.07
Arsenic, As 1.3
Cadmium, Cd 30
Chromium, Cr 271
Copper, Cu 1.5
Manganese, Mn 74
Nickel, Ni 30
Vanadium, V 46
• Organic Constituents (mg/I)
Total Organic Carbon, C 29
Followirig`the'discove"ry`of the7inerdamage;'the"fank'was'tepaired by neutralizing the 6-
to 8-inch thick soil pad at the base of the tank with soda ash, adding 6 inches of clean

Texasgulf Inc.
File Number 88-089
1-2
silica sand above the existing soil pad, installing a new steel tank bottom, and installing a
new rubber liner within the tank. The existing 6- to 8-inch thick soil pad is underlain by
a PVC liner which was maintained in -place as part of the repair. Since implementing these
repairs, Tank 008 has been re -activated and is presently in use.
In response to the tank leak incident, the Diyision of Environmental Management (DEM)
issued -a -halide -of noncompliance-on-AugUSt 8; 1988 and requested the submission of: (i)
an assessment report characterizing the groundwater conditions in the tank farm area and
identifying the extent of the contaminants, and; (ii) a remedial action plan outlining the
proposed corrective actions to remediate the groundwater impacts. In accordance with
these requests, a preliminary contamination assessment and remedial action plan were issued
on September 7,'1988-and October 10, -1988; respectively.
12 Objectives and Status of Tank Leak Incident Remedial Action Plan
The objectives of the remedial action plan as submitted to the DEM were to: (i) remove
the source of contamination (Tank 008) addressed in the notice of noncompliance; (ii)
minimize and contain future spills from tanks and associated pumps and pipelines in the
tank farm (source control); (iii) pump existing contaminated groundwater from the surficial
aquifer underlying the tank farm; and (iv) protect the adjacent Pamlico River barge slip
from significant impacts from existing contaminants in the surficial aquifer. To achieve
these objectives, the following four element remedial action system was undertaken.
• Repair Tank 008 to remove the source of contamination addressed in the
notice of noncompliance.
• Provide new containment facilities for the existing tank farm main east -to -
west piperack and phosphoric acid and super phosphoric acid tanks to
minimize and contain future spills.
• Pump existing contaminated groundwater from the surficial aquifer underlying / - — the tank farm area in conjunction with the installation of the new
containment facilities.
• Monitor the quality of groundwater flowing northward from the tank farm
towards the Pamlico River barge slip within the surficial aquifer to determine
if additional remedial measures are needed in the future to protect the
Pamlico River from significant impacts.
1.2.1 Repair of Tank 008 and Installation of New Containment Facilities
Tank: 008 -has ',teen repaired, as described above, and accordingly the source of
contamination identified in the August 8, 1988 notice of noncompliance has been removed.
The'new.,•main east-to-,westjpiperack,spilli containment'.system isfargelyainstalled,''and is,
schedulediforscompletiothby:;December 1.989.9 The long-term program to minimize and
contain leaks/spills around the phosphoric and super phosphoric acid tanks in the tank
farm area is also underway. The relocation and reconstruction of Tank 044 is already

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Texasgulf Inc.
File Number 88-089
1-3
complete, and Tank 016 has been relocated with reconstruction scheduled for completion
by December 1989 (Figure 2-1)*.
1.2.2 Pumping of Existing Contaminated Groundwater
•
A shallow::well=p'ointidewateringsystem':was.installed to. allow excavation .of the existing
piperack'-foundatioris' :as'^part >of • construction of ,/the :main east -to -west -piperack spill
containment --system. Permit No. 06-0071-WS-0150 was issued by the Division of
Environmental Management for the installation of the well -point system. The <f rst/stage
of..the"-well=point system(Figure 4=1)(was =operated,?from July.12;through Septemberl1,
1988Eat '•flow 2iates-43f =7- to =37ii-. gal/min.•and -yielded an estimated .1.1x10* gallons of
contaminated groundwater from the surficial aquifer with a pH of 2.8 to 4.5 and specific
conductance of 4,000 to 16,000 µmhos/cm (Figure 1-2). Groundwater removed by the well -
point system was pumped to Cooling Pond No. 2.
•
The Stage 1 _dewatering system was subsequently removed, and re -installed at the Stage 3
location (Figure 1-1). The Stage 3 dewatering system was operated from September 13,
1988 through November 1, 1988 and removed on November 3, 1988.. The Stage 3 well -
point system was operated at the rates of 21 to 33 gal/min and yielded an estimated 610,000
gallons of contaminated groundwater from the surficial aquifer with a pH of 2.0 to 3.7 and
a specific conductance of 2,700 to 20,500 µmhos/cm (Figure 1-2). Groundwater removed
by the well -point system was pumped to Cooling Pond No. 2.
The remedial action plan originally anticipated operating the Stage 3 well -point system for
a period of up to one year. The Stage 3 well -point system, however, was removed on
November 3, 1988 upon completion of construction of the piperack spill containment system
foundations. The well -point system was designed by the contractor to be a temporary
construction dewatering system. It was subsequently discovered after submission of the
remedial action plan in October 1988 that the temporary dewatering system could not be
effectively operated for an extended period of time, such as one year, due to the excessive
monitoring and maintenance requirements of the system.
1.2.3 Groundwater Monitoring
Three monitor well clusters, designated MWTF-1, MWTF-2 and MWTF-3, were installed
in the tank farm in accordance with the remedial action plan to monitor the quality of
groundwater flowing northward toward the Pamlico River barge slip (Figure 1-1). These
monitor wells were installed in October 1988 and have been sampled three times to -date
(in January, April and July 1989). An evaluation of the quality of groundwater at the
monitor wells is presented in Section 3.
* Presently, construction plans are to relocate and rebuild Tanks 007, 008, 009 and 013
in 1990, Tanks. 015, 017, 019, 021 and 023 in 1991, and Tank 006 in 1992. Note that
the tank locations depicted in Figures 1-1 and 2-1 are the existing tank locations. The
reconstructed locations were depicted in Figure 4 (East Group Drawing DOG-071-047)
of the remedial action plan submitted October 10, 1988.
':J J

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Texasgulf Inc.
File Number 88-089
1-4
13 Leak at Underground Drain Line
On.'June:5, 1989,, ih DEM was infoi id'by,Texasgulf Inc. that a leak :of in excess of
5,000pounds :of4hosph'oiic.acid had :been-diseovefed.in`an underground drain line in the
tank farm :area.AFigure.-..1-1).:7_ Water, -leaking ;from the drain line was reportedly'
characterized by..a.;pH..of<2.2,' and iflubride and. phosphorus concentrations of 1,660 and
4,900 mg/1, respectively.. -;The' drain line is a gravity -flow pipeline connecting two sumps, and
the leak occurred ahrough'a"damaged-section'•of the.pipelines:'In response to the leak
incident, the DEM issued -a notice of violation on September 1, 1989 and requested the
submission of an active remedial action plan to abate groundwater contamination from both
the Tank 008 and drain line leak incidents.
Accordingly, in response to the DEM request, this document outlines supplemental remedial
action efforts, to be undertaken in conjunction with the on -going program of source'control
(i.e., the new containment facilities for.. the piperack and phosphoric acid tanks), to abate
groundwater contamination in the tank farm area.
The damaged section of pipeline has since been replaced and the sump and drain liner
are again.iri`use.

A11
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MONITOR WELL ' ,• MONITOR WELL
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STAGE 1 WELL -POINT
DEWATERING SYSTEM
I I • I -I, i , I (OPERATED FROM
3 ;
07/12/68 THROUGH
• TANK 008 ' I
(LEAK INCIDENT .. ". •L —
REPORTED 05/31/88) !
I t •') • (4.;5"" f Of
•
OW„
5
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LOCATION OF UNDERGROUND
DRAIN LINE LEAK INCIDENT
(LEAK INCIDENT REPORTED 06/05/89
• I I ei''
100 200
WS-CjT51
SCALE 1"-150'
• I
•
O • ) 621
STAGE 3 WELL -POINT
DEWATERING SYSTEM
(OPERATED FROM 09/13/88
THROUGH 11/01/88) t
09/01/88)
- ..'MONITOR WELL
.• I CLUSTER MWTF-1
•
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H (-) ! i!•;)
TANK FARM SITE PLAN
cry Ardarnan & Associates, Inc.
01,1A1 Consulting Engineers in Soil Pile:hanks.
foundations, end Materials Testing ge
SUPPLEMENTAL REMEDIAL ACTION PLAN
TANK FARM AREA
TEXASGULF INC.
PHOSPHATE OPERATIONS
AURORA. NORTH CAROUNA
011Aelo• RBE &Melt ii•: ' •9/22/89
Inv
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JUL 1 1988
AUG 1988
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PUMPING RECORD AND GROUNDWATER QUALITY
AT WELL -POINT DEWATERING SYSTEM
Ardaman & Associates, Inc.
Consulting Engineers In Soil Mechanics.
Foundations. and Materials Testing
SUPPLEMENTAL EMEFARIAAL L ACTION PLAN
TEXASGULF INC.
PHOSPHATE OPERATIONS
AURORA, NORTH CAROLINA
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Texasgulf Inc.
File Number 88-089 2-1
Section 2
GENERALIZED HYDROGEOLOGIC SETTING
IN TANK FARM AREA
2.1 Monitor Well Locations
The locations of the three tank farm monitor well clusters, designated MWTF-1, MWTF-2
and MWTF-3, are depicted in Figure 2-1. As shown, monitor well cluster MWTF-1 is
located about 180 feet south of phosphoric acid Tank 016 near the fertilizer blend storage
area. Monitor well clusters MWTF-2 and MWTF-3 are located about 230 feet north of the
phosphoric acid tanks. Three monitor wells were installed at each cluster (designated A,
B and C), providing a total of nine monitor wells in the tank farm area.
2.2 Monitor Well Installation and Construction
The monitor wells were installed by Ardaman & Associates, Inc. (North Carolina Driller
Registration No. 1019) in accordance with well construction permit No. 06-0071-WM-0156.
The monitor wells were installed between October 21 and October 27, 1988.
A Standard Penetration Test (SPT) boring was performed at the location of each monitor
well cluster to the top of the Yorktown formation. The subsurface profile determined at
each location was then used to establish the depths for installation of the monitor wells
The Standard Penetration Test borings were conducted in accordance with ASTM D 1586
with split -spoon samples obtained at 5-foot intervals. The boreholes were sealed with
cement-bentonite grout to land surface upon completion of sampling.
The monitor wells were installed in accordance with NCAC Subchapter 2C.0100 "Well
Construction Standard?. A schematic detail of the monitor wells is presented in Figure
2-2*. The wells were installed by: (i) advancing a 6-inch diameter hollow -stem auger to
the final well depth using a wooden plug at the bottom of the auger to maintain the inside
of the auger clear of soils; (ii) filling the auger with clean water and knocking out the
wooden plug; (iii) inserting a 2-foot length of slotted PVC well screen (0.010-inch wide
slots) with a stainless steel centralizer connected to a 2-inch diameter Schedule 40 solid
threaded flush joint PVC casing inside the auger; (iv) backfilling the annular space between
the 10-inch diameter borehole created by the auger flights and well screen with 8/16 silica
sand; (v) installing a 12-inch minimum thick tamped bentonite seal above the collection
zone; and (vi) removing the hollow -stem auger and sealing the remaining annular space
between the well casing and inside of borehole with neat cement grout to land surface.
Each of the monitor wells was provided with a vented locking cap and labelled with the
designation and related information as required by NCAC Subchapter 2C.0100.
* Monitor well clusters MWTF-1 and MWTF-3 were installed with the at -grade leak -
resistant steel manhole covers depicted in Figure 2-2. Monitor well cluster MWTF-2
was installed with conventional PVC well casings extending about 2.5 feet above grade.

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Texasgulf Inc.
File Number 88-089
2-2
After installation, each well was flushed with clean water, developed and the water level
recorded. Construction records (Form GW-1) for each monitor well were previously
submitted to the DEM on December 29, 1988 and are also included in Appendix A
identifying:
• Date of Installation
• Total Depth of Well
• Casing Length
• Grout Seal Interval
• Well Screen Length
• Thickness and Depth of Collection Zone (Gravel Pack)
• Thickness and Depth of Bentonite Seal
23 Generalized Subsurface Stratigraphy
The results of the Standard Penetration Test borings conducted at each monitor well
cluster are presented on the soil boring logs in Appendix B. The stratification lines
indicated on the boring logs -represent our interpretation of the contents of the field logs,
and the results of laboratory observations and index tests on the recovered split -spoon
samples. Laboratory index tests used to classify the soils are shown on the boring Togs, and
the soils were classified in accordance with ASTM D 2487 standard test method for
classification of soils for engineering purposes. The stratification lines represent the
approximate boundary between soil types and the transition may be more gradual than
implied. The locations of the monitor well collection zones within the soil profile are also
depicted on the soil boring logs.
The soil borings were completed to a depth of 60 feet in order to penetrate the
undifferentiated surficial deposits and Pleistocene Croatan formation, and encounter the
top of the Pliocene Yorktown formation. The subsurface conditions encountered at the
soil borings consisted of the following generalized stratigraphy. Figure 2-3 depicts the
generalized subsurface stratigraphy across the tank farm area.
Undifferentiated Surficial Deposits
• A surficial layer of interbedded fine sand to clayey fine sand (generally
believed to be comprised of fill materials) extended from ground surface
to depths of 5 to 14 feet. Standard Penetration Test resistance values in
these soils varied widely from 9 to 43 blows per foot, representative of
loose to dense sands, with an overall average of 29±12 blows/foot from 13
determinations. The upper monitor well at each well cluster (i.e., wells
designated 1A, 2A and 3A) tapped the base of this surficial sandy stratum.
• The surfic• ial sandy stratum was underlain by a 4.5- to 9.0-foot thick brown
to dark brown clayey fine sand to plastic clay layer. Standard Penetration
Test resistance values in this layer ranged from 0 blows/foot in the plastic
clay (boring TF-3) to about 10 blows/foot in the clayey sands, characteristic
1

Texasgulf Inc.
File Number 88-089
2-3
of very soft to stiff clayey soils. Two fines content* determinations on soil
samples from this layer yielded values of 35% in a clayey sand and 59% in
a sandy clay.
• A gray to brown fine sand to silty fine sand layer ranging in thickness from
1.5 to 4.5 feet, with an average thickness at the three borings of about 3 feet
was encountered below and confined by the overlying clayey sand to plastic
clay layer. Standard Penetration Test resistances ranged from 10 to 31
blows/foot, characteristic of a medium dense sand. The intermediate
taeppth
h
monitor well at each cluster (i.e., wells designated 1B,
this confined sand layer.
• A 10.5- to 20.8-foot thick stratum of typically gray to greenish -gray clayey
fine sand to sandy clay often with some shell fragments was encountered
within the base of the undifferentiated surficial deposits. Standard
Penetration Test resistance values within this stratum were characteristic of
soft to medium stiff clayey soils with blow counts of 2 to 7 blows/foot and
an average of 5±2 blows/foot. Four fines content determinations
onhsoail
samples from this stratum yielded values of 47, 25, 31 and 31
To average of 34±9%.
Croatan Formation
• The Croatan formation, generally consisting of clayey to silty fine sand and
shell fragments occasionally with cemented sand, was encountered at depths
of 32 to 38 feet and extended for thicknesses of 15 to 20 feet. This
formation is confined by the overlying clayey sand to plastic clay layer in the
base of the undifferentiated surficial deposits, and below by the Yorktown
formation. The standard Penetration Test resistance varied -widely from 7
to 69 blows/foot (when cemented sands were present) with a representative
value of about 13 blows/foot, characteristic of a medium dense sand. The
deepest monitor well at each cluster (i.e., wells designated 1C, 2C and 3C)
tapped the Croatan formation.
Yorktown Formation
• The Yorktown formation underlies and confines the Croatan formation,
and was generally found to consist of clayey fine sand to sandy plastic clay.
The Yorktown formation was encountered at depths of 47 to 43 feet and
extended below the 60-foot completion depth of the borings. Standard
Penetration Test resistances varied from 6 to 12 blows/foot with an average
of 9 blows/foot, characteristic of stiff clayey soils.
Where the fines content is the soil fraction by dry weight finer than the U.S. Standard
No. 200 sieve.

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Texasgulf Inc.
File Number 88-089
2-4
24 In Situ Permeability Tests
An in situ permeability test was performed in each monitor well by raising the water level
in the well and measuring the rate of decline with time using an electric pressure transducer
and data acquisition system. The test results were analyzed to provide an estimate of the
in situ horizontal coefficient of permeability of the formation containing the well collection
zone for the case of a homogeneous, isotropic aquifer. The calculated horizontal
coefficients of permeability are summarized below:
Horizontal
Coefficient
Monitor Screen Depth of Permeability Fines
Well (Feet) (cm/sec) Content(%)`
MWTF-1A 3.4 - 5.4 4.0 x 104 13
MWTF-1B 10.6 - 12.6 3.9 x 104 20
MWTF-1C 38.7 - 40.7 9.7 x 10' 16
MWTF-2A 10.2 - 12.2 3.8 x 104 21
MWTF-2B 18.8 - 20.8 1.1 x 10.2 6
MWTF-2C 39.7 - 41.7 1.4 x 10'4 24
MWTF-3A 10.9 - 12.9 3.2 x 10-' 22
MWTF-3B 24.2 - 26.2 1.1 x 10'Z 3
MWTF-3C 44.7 - 46.7 3.1 x 10' 16
The in situ horizontal coefficients of permeability ranged from 1.1x10-1 to 3.8x104 cm/sec,
with the confined sand layer displaying the greatest coefficients of permeability. The in situ
horizontal coefficients of permeability judged representative for the various stratigraphic
units are presented below:
Fines content (soil fraction by dry weight finer than the U.S. Standard No. 200 sieve)
determined on split -spoon soil samples from Standard Penetration Test borings
completed at each monitor well cluster location.

misigmanaiansireapiitainalitl4'd/R"Q"WifRur SY.c 4.'E 4 _
Texasgulf Inc.
File Number 88-089
Horizontal Coefficient
Stratigraphic Unit of Permeability (cm/sec)
Surficial Sand Layer*
Confined Sand Layer**
Croatan formation
1.3 x 104
1.1 x 10'Z
4.7 x 104
2-5
25 Groundwater Levels, Aquifer Flow Directions and Seepage Velocities
Groundwater levels were measured in the monitor wells at the time of each sampling event
in January, April and July, 1989. The measured water level elevations are summarized
below.***
Water Level Elevation, Feet (MSL)
Monitor Well 01 89 04/89 07/89
MWTF-1A 8.47 9.44 9.14
MWTF-1B 8.06 8.66 8.66
MWTF-1C -3.96 -0.74 -2.19
MWTF-2A 6.82 6.94 5.25
MWTF-2B 4.14 4.66 4.30
MWTF-2C -1.85 -0.45 -1.06
MWTP-3A 7.45 7.57 7.15
MWTF-3B 3.13 3.67 3.37
MWTF-3C -2.61 -0.49 -1.32
Based upon the measured water level elevations, the direction of groundwater flow in the
various layers tapped by the monitor wells are presented in Figures 2-4, 2-5 and 2-6. As
shown, the direction of groundwater flow in the surficial sand layer (Figure 2-4) is generally
north -northwestward at a gradient of about 0.005 feet/foot. For the selected in situ
horizontal coefficient of permeability of 1.3x10'' cm/sec (135 feet/year) the resulting
Based upon the reported pumping rates from the well -point dewatering system (Figure
1-2), a coefficient of permeability of up to 1x103 cm/sec may also be appropriate for
portions of the surficial sand layer.
** Based upon the more pervious soils at monitor wells MWTF-2B and MWTF-3B,
disregarding the 3.9x10' cm/sec value measured at monitor well MWTF-1B.
***Surface water level elevations of 0.6 feet (MSL) for the barge slip and 6.1 to 6.7 feet
(MSL) for the drainage ditch near monitor well clusters MWTF-2 and MWTF-3 were
also measured in January 1989.
11

1
1
1
1
As shown in Figure 2-7, the water level elevations generally decline with depth, indicative
of downward vertical seepage. The verticalgradient across the clayey fine sand to plastic
clay layer separating the confined sand layer and Croatan formation (i.e., between monitor
wells designated B and C) varies from 0.49 to 0.54 feet/foot with an average of 0.51
feet/foot. Vertical gradients across the clayey fine sand to plastic clay layer separating the
` surficial and confined sand layers (i.e., between monitor wells designated A and B) equalled
0.44 and 0.48 feet/foot at clusters MWTF-2 and MWTF-3, and 0.13 feet/foot at cluster
MWTF-1. For an overall representative vertical gradient of 0.50 feet/foot, estimated in situ
vertical coefficient of permeability on the order of 1x10d cm/sec for the clayey sands to
plastic clays and a porosity of 0.50, the resulting estimated vertical seepage rate is on the
order of 1 foot/year.
a
Texasgulf Inc.
File Number 88-089
2-6
horizontal seepage velocity is a relatively slow 2 feet/year (based upon a porosity of 0.35).
The direction of groundwater flow in the confined sand layer (Figure 2-5) is also generally
northward, but slightly to the north-northeast, at a slightly larger gradient of about 0.01
feet/foot. For the selected in situ horizontal coefficient of permeability of 1.1x104 cm/sec
(11,400 feet/year), the resulting horizontal seepage velocity is about 300 feet/year. ' This
seepage velocity is 150 times greater than occurs in the surficial sand layer, and results
largely due to the greater coefficient of permeability and to a lesser extent from the larger
gradient.
The direction of groundwater flow in the Croatan formation (Figure 2-6) is opposite the
direction of flow in the overlying undifferentiated surficial deposits, and is generally south -
southeastward at a gradient of about 0.0023 feet/foot. For the selected in situ horizontal
coefficient of permeability of 4.7x10 ° cm/sec (490 feet/year) the horizontal seepage velocity
is a relatively slow 3 feet/year.

1
1
1
1
:« ..i 7."_Ori L� -lam.•o • •.P•
'DEPTH
VARIES
8'
3:
8'
12'
24'
-,LEAK—PROOF LOCKING CAP
6.25—INCH I.D. LEAK RESISTANCE
STEEL MANHOLE
3'x3'x4' THICK CONCRETE PAD
GROUND SURFACE
.8/18 SILICA SAND;.;;•;:
10 INCH DIAMETER BOREHOLE
ADVANCED WITH HOLLOW STEM
AUGER
NEAT CEMENT GROUT:
• 6 GALLONS OF CLEAN WATER
• 1 SACK OF CEMENT (94 Ibs)
• 4.0 — 4.5 Ibs OF BENTONITE
2 INCH DIAMETER SCHEDULE
40 THREADED FLUSH JOINT
PVC WELL CASING
FINE SILICA SAND
TAMPED BENTONITE SEAL
8/18 SILICA SAND
COLLECTION ZONE
STAINLESS STEEL CENTRALIZER
2 INCH DIAMETER SCHEDULE 40
PVC WELL SCREEN
(0.010 INCH WIDE SLOTS)
END CAP
SCHEMATIC OF MONITOR WELL INSTALLATION
®' Ardaman & Associates, Inc.
Consulting Entanwn in Soil Mechanics,
Foundations. and Materials Tinting
SUPPLEMENTAL REMEDIAL ACTION PLAN
TANK FARM AREA
TEXASGULF INC.
PHOSPHATE OPERATIONS
AURORA, NORTH CAROUNA
N2436a
FIGURE 2-2

MWTF-2A
EL 6,94' j
100 200
SCALE 1'-150'
&, MWTF-3A
EL 7.57' -/
".MWTF-1A
EL 9.44'
WATER TABLE ELEVATION
IN FEET (MSL) AS MEASURED
IN APRIL 1989'
WATER TABLE ELEVATION IN
SURFICIAL SAND LAYER
Ardaman & Associates, Inc.
Consulting Engineers in Sal M Wrriia,
Foundations, nd Martinis Testing
SUPPLEMENTAL REMEDIAL ACTION PLAN
TANK FARM AREA
TEXASOULF.INC.
PHOSPHATE OPERATIONS
.. ... AURORA;.NORTHp,�CAROUNA
MAIM a• RSE IaaWD rt: WI ern: 9/22/89
te-SWAren.'711
N2456
FIGURE 2-4

MWTF-28
EL 4.66' CO
100 200
SCALE 1"-150'
EL 3.67'
@.0•
MWTF-1 B
® EL 8.66'
POTENTIOMETRIC SURFACE MAP
FOR CONFINED SAND LAYER
PIEZOMETRIC WATER
ELEVATION IN FEET (MSL)
IN APRIL 1989
•
®® Ardaman 8 Associates, Inc.
fanzAi Coruultinl Engineers In Soil Lbd,w a.
Foundations, and Materials Testing
SUPPLEMENTAL REMEDIAL ACTION PLAN
TANK FARM AREA -
TEXASOULF INC.
PHOSPHATE OPERATIONS
AURORA, NORTH CAROLINA
wewN.
E 1040.101T: ottl DATE 9/22/69
N24568
FIGURE 2-6
qla M;.
ee-069

' PIEZOMETRIC WATER
ELEVATION IN FEET (MSL)
IN JULY 1989 2p
100
200
C.
MWTF-3 C'''
MWTF-1C
EL. -2.19' `t.,,,,!
POTENTIOMETRIC SURFACE MAP
FOR CROATAN FORMATION
®a Ardaman & Assocktes, Inc.
wisilits Consulting Endn"n In Soil MMunks,
Foundation. and M.t,SI. Tonne
SUPPLEMENTAAL REMEDIALEAACTION PLAN
TEXASOULF INC.
PHOSPHATE OPERATIONS
AURORA, NORTH CAROUNA
SCALE
1"-150'
anwm. ROE 'srmacno :'N o•n: 9/22I99
MI W.
Pe*?
FIGURE-2-6

Texasgulf Inc.
File Number 88-089 3-1
Section 3
CHARACTERIZATION OF GROUNDWATER QUALITY AT
TANK FARM MONITOR WELL AND WELL -POINT SAMPLING LOCATIONS
Groundwater samples have been obtained three times to -date at each of the nine monitor
wells and a nearby Castle Hayne aquifer water supply well between January and July 1989,
and once at a well -point sampling location in March 1989. Additionally, a surface water
sample was obtained from the adjacent Pamlico River barge slip in January 1989.
3.1 Groundwater Sampling Methodology
Groundwater sampling of the monitor wells was undertaken by Texasgulf Inc. personnel
in accordance with the sampling procedures outlined in the Tank Farm Remedial Action
Plan.* Groundwater sampling of the well -points was undertaken by Ardaman & Associates,
Inc. personnel in accordance with the procedure outlined below in Section 3.1.2.
3.1.1 Water Quality Parameters and Test Procedures
Groundwater from each monitor well, water supply well and the well -points was analyzed
, for the following parameters:
• Field Specific Conductance
• Field and Laboratory pH
• Total Phosphorus, P
• fluoride, F
• Chloride, CI
• Sulfate, SO.
• Total Dissolved Solids, IDS
• Total Organic Carbon, TOC
All laboratory chemical analyses were performed by Texasgulf Inc. Specific analytical
procedures used to determine the water quality parameters are summarized below.
* Ardaman & Associates, Inc. (1988). "Remedial Action Plan for Tank Farm Ar
Texasgulf Inc., Phosphate Operations, Aurora, North Carolina.

1
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1
1
Texasgulf Inc.
File Number 88-089
Parameter
Specific Conductance
pH
Total Phosphorus
Fluoride
Chloride
Sulfate
Total Dissolved Solids
Total Organic Carbon
Method
Conductivity Cell
Electrometric
Chlorimetric, Ascorbic
Acid, Single Reagent
Potentiometric, Ion
Selective Electrode
Potentiometric, Ion
Selective Electrode
Gravimetric (without
silica removal)
Gravimetric @ 180°C
Persulfate-Ultraviolet
Oxidation Method
Reference
120.1 *
150.1 *
365.2*
340.2*
407.C**
375.3*
160.1*
505.B**
3-2
3.1.2 Well -Point Installation and Sampling
To determine the quality of groundwater nearer potential sources of phosphoric acid
leaks/spills, groundwater was sampled with a well -point sampling device at a location
(designated WPTF-1) just north of the piperack near phosphoric acid Tank 009 (Figure
2-1).
The well -point sampler consists of a 1.34-inch outside diameter by 9.0-inch long No. 8
slotted stainless steel well screen with an 18° cone tip. The sampler is attached to
conventional AW drill rod for inserting into the ground. A 0.375-inch outside diameter
(0.250-inch inside diameter) polypropylene tube is attached to the sampler and carried to
the surface through the inside of the AW drill rod. During sampling of groundwater, a
vacuum is applied to the polypropylene tube and groundwater is withdrawn from the
sampling zone through the well screen to the surface.
The well -point sampling was completed by: (i) advancing a 6.5-inch outside diameter
(3.25-inch inside diameter) hollow -stem auger to just above the desired sampling depth;
(ii) removing soil from within the hollow -stem auger (generally a 6- to 12-inch thick plug
of soil forms at the base of the auger) by rotary washing with clean water; (iii) driving a
split -spoon sampler 18-inches below the bottom of the auger and extracting a soil sample
to verify the nature of the soil from which the groundwater will be withdrawn; (iv) inserting
the well -point sampler down the borehole and driving the sampler until the 9-inch long well
screen is below the interval sampled by the split -spoon sampler; (v) applying a vacuum to
the polypropylene tube and extracting groundwater and collecting a sample afte�Ih�_p.E
and sttecific conductance achjgve_constant.xalues; (vii) removing the well -point sampler and
* "Methods for Chemical Analysis of Water and Wastes", Environmental Monitoring and
Support Laboratory, Office of Research and Development, USEPA, Report EPA-600/4-
79-020, March 1983.
"Standard Methods for the Examination of Water and Wastewater", 16th Edition, 1985.
**

Texasgulf Inc.
File Number 88-089
hollow -stem auger after extraction of the
borehole with a neat cement grout to land s
Four groundwater samples were extracted at
The sampling intervals were 3.0 to 3.75 feet,
to 47.
3.2 ,Surface Water Quality
3-3
groundwater sample; and (viii) sealing the
urface.
location WPTF-1 with the well -point sampler.
11.25 to 12.0 feet, 25.25 to 26.0 feet and 46.25
The tank farm area is adjacent to a barge slip and the Pamlico River which contain
brackish water. Because the quality of groundwater in the surficial and Croatan aquifers
in the tank farm area can potentially be affected by the brackish water (depending on the
direction of groundwater flow), a surface water sample was obtained from the barge slip to
characterize constituents within the brackish water.* The results of these chemical analyses
are presented below.
• FIELD MEASUREMENTS
Sampling Date
Specific Conductance (µmhos/cm)
Temperature (°C)
Field pH
Odor
Appearance
• LABORATORY ANALYSES
Lab pH
Total Phosphorus, P (mg/t)
Fluoride, F (mg/l)
Chloride, Cl (mg/1)
Sulfate, SO, (mg/1)
Total Dissolved Solids, TDS (mg/1)
Total Organic Carbon, TOC (mg/1)
01/27/89
28,820
20
7.8
None
Brown
7.8
0.20
0.72
10,900
1499
19,248
7
As expected, the brackish water is high in total dissolved solids with elevated concentrations
of sulfate and chloride. The concentration of sodium, although not measured, would also
be relatively high (on the order of 6000 mg/1). Fluoride and total phosphorus
concentrations are relatively low and on the same order -of -magnitude as naturally occurring
in groundwater at the site. The measured fluoride and total phosphorus concentrations are
also in generally good agreement with typical values reported by Hem (1970)** for sea
water of 1.3 and 0.07 mg/1, respectively.
* The sample was obtained from near the mid -point of the barge slip.
** Hem, J.D. (1970). "Study and Interpretation of the Chemical Characteristics of Natural
Water". Geological Survey Water Supply Paper 1473.

9
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Texasgulf Inc.
File Number 88-089
3-4
33 Groundwater Quality
Summaries of groundwater quality at the nine monitor wells and at the well -point sampling
location are presented in Tables 3-1 through 3-4. The maximum contaminant levels
specified in NCAC Subchapter 2L.0202 are also presented for comparison.
3.3.1 Surficial Aquifer Groundwater Quality
The surficial aquifer at the tank farm is comprised of the undifferentiated surficial deposits
(Section 2.3), and generally extends to a depth of about 50 feet. Within the aquifer, two
layers were tapped by monitor wells: (i) the surficial sand layer; and (ii) a relatively thin
confined sand layer occurring at a depth of 10 to 20 feet and extending for a thickness of
about 4 feet.
3.3.1.1 Surficial Sand Laver
The average* constituent concentrations measured in the surficial sand layer are summarized
below and presented in Figure 3-1.
Well
Monitor Well Point
Parameter MWTF-1A MWTF-2A MWTF-3A WPTF-1A
Field pH 6.8 6.4 5.7 6.2
Specific Conductance (µmhos/cm) 452 1790 1383 3100
Total Phosphorus, P (mg/l) 0.40 0.15 0.22 87.0
Fluoride, F (mg/i) 0.71 0.18 0.14 0.23
Chloride, CI (mg/I) 16 66 310 69
Sulfate, SO, (mg/1) 74 308** 98 1862
Total Dissolved Solids, TDS (mgf) 325 973** 794 3508
Total Organic Carbon, TOC (mg/l) 5.7 11 8.3 12
As shown, at monitor well MWTF-1A upgradient of the phosphoric acid facilities, the
phosphorus, fluoride and sulfate concentrations (major contaminants in phosphoric acid -
see Section 1.1) were relatively low indicating that groundwater impacts do not exist in the
surficial sand layer at this location. The measured constituents are also in compliance with
Subchapter 2L.0202 maximum contaminant levels.
* Average constituent concentrations from three groundwater samples obtained in January,
April and July 1989.
** Disregarding apparently high concentrations of 1,090 mg/1 of sulfate and 2,339 mg/I of bJh -/
total dissolved solids reported for April 1989.

Texasgulf Inc.
File Number 88-089
3-5
At 'downgtadientwell-point sampling flocation",WPTF4At the • phosphorus, 'sulfate, 'total
organic:.'carbon:_and rtotalytiissolved csoh. dsconcentrations • are • elevated, --indicative .of
contamination: from phosph6riccadidleakage/spills.ti At further downgradient monitor wells
MWTF-2A and MWTF-3A, however, total phosphorus concentrations are low (only 0.15
and 0.22 mg/1) and sulfate is only slightly elevated (308 mg/1) at MWTF-2A. Accordingly,
impacts from phosphoric acid leakage/spills have not occurred at monitor wells MWTF-2A
and MWTF-3A, which would be expected given the relatively slow horizontal seepage
velocity in this layer (Section 2.5), as well as vertical seepage causing contaminants in this
layer to migrate downward into the underlying confined sand layer. Further, although
slightly elevated sulfate and total dissolved solids concentrations occur at monitor well
MWTF-2A in comparison to MWTF-1A, the seepage of this groundwater into the adjacent
barge slip will not result in surface water impacts because the brackish water sulfate and
total dissolved solids concentrations are higher (Section 3.2) than occur in the groundwater.
3.3.1.2 Confined Sand Layer
The average constituent concentrations measured in the confined sand layer are summarized
below and presented in Figure 3-2.
Parameter
Well
Monitor Well Point
MWTF-1B MWTF-2B MWTF-3B WPTF-1C
Field pH 5.6 6.4 6.0 6.4
Specific Conductance (gmhos/cm) 920 2300 2143 2100
Total Phosphorus, P (mg/I) 0.19 65.6 94.9 34.5
Fluoride, F (mg/1) 0.27 1.61 0.18 0.43
Chloride, CI (mg/I) 213 328 104 115
Sulfate, SO. (mg/l) 17 355 512 587
Total Dissolved Solids, TDS (mg/1) 538 1497 1348 770
Total Organic Carbon, TOC (mg/I) 3 9.7 7.7 11
As shown, at monitor well MWTF-1B upgradient of the phosphoric acid facilities, the
phosphorus, fluoride and sulfate concentrations are relatively low indicating that impacts
do not exist in the confined sand layer at this location. The fluoride, chloride and sulfate
constituent concentrations are in compliance with Subchapter 2L.0202 maximum
contaminant levels at this location, although pH and the total dissolved solids concentration
are somewhat beyond the maximum contaminant levels.
•Well -point WPTF4B;3sampled•fi6ihiaidepth;pf41:25Jo110 ifeet in the clayey sand
layer=tiiiderlyingzhe tirfieialIandtisplayeci higher coutatninaiit4evels (Table 34).
The"phosphorus'; sulfate►ndrtotaltdis§olved%tilids'cb`n'centratioii 'were':veryhighin'this
well -point '(P-.� 5,27_5.Ong/1;4SOj=i2,555M1 /!,'mad:'tIDS:ir 20,076:ing/I). 'The'specific
conductance: of;11,000FµmliblicanwasialsTa'�lti ggreemenf vuhthe values 'reported forgrouudwateripumped+fromxheVellivintAleWatbting!atem Figured )•

Texasgulf Inc.
File Number 88-089 3-6
At downgradient well -point sampling location WPTF-1C, the phosphorus, sulfate and total
dissolved solids concentrations are elevated, indicative of contamination from phosphoric
acid leakage/spills. At further downgradient monitor wells MWTF-2B and MWTF-3B
contamination also exists as evidenced by elevated phosphorus (65.6 to 94.9 mg/1), sulfate
(355 to 512 mg/1), and total dissolved solids (1348 to 1497 mg/1) concentrations.
Contamination at monitor wells clusters MWTF-2 and MWTF-3 in the confined sand layer
(Figure 3-2) without contamination in the overlying surficial sand layer (Figure 3-1) is
explainable due to the differences in horizontal seepage velocity, and downward seepage
gradient observed at each well cluster location (Section 2.5). Leakage/spills of phosphoric
acid from the tanks and piperack enters the surficial sand layer and migrates both
horizontally (north -northwestward) within the layer and downward across the underlying
clayey sand to plastic clay layer into the confined sand (Figure 2-3). Once contaminants
enter the confined sand layer, which can have a seepage velocity on the order of 300
feet/year (Section 2.5), the contaminants can migrate horizontally at a much greater rate
than in the surficial sand layer.
3.3.2 Croatan Aquifer Groundwater Quality
The Croatan aquifer is generally comprised of relatively pervious coarse to fine sands and
shell within the Croatan formation. At the tank farm, the Croatan formation soils were
gegerally'3omewhatiilty to clayey, and not as pervious as found elsewhere at the phosphate
opettatioe-Whe Croatan formation soils were encountered at depths of 32 to 38 feet, and
extended for thicknesses of 15 to 20 feet.
The average constituent concentrations measured in the Croatan formation monitor wells
are summarized below and presented in Figure 3-3.
At'boring TF-1, a pervious zone was encountered in the Croatan formation at a depth
ofc42{eefas'indicatedby a:loss of drilling fluid circulation (see boring log in Appendix
B):`1'The :horizontal coefficient of permeability •determined 'in 4he monitor. well; just;
tappingithis.zone {MWTF-1C) ,was ;Also ,the ;highest ,of ":the :thr'"ee"•tatik�fer n'Ci6atan
formation -monitor wells., r o r .t . ,H t.4, _

I..
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Texasgulf Inc.
File Number 88-089 3-7
G TaNi PA. ;
Parameter
Field pH
Specific Conductance (gmhos/cm)
Total Phosphorus, P (mg/1)
Fluoride, F (mg/1)
Chloride, CI (mg/l)
Sulfate, SO, (mg/I)
Total Dissolved Solids, TDS (mg/l)
Total Organic Carbon, TOC (mg/1)
Well
Point
WPTF-1D
6.5
2800
34.3
0.37
195
727
1084
13
Monitor Wells
MWTF-1C MWTF-2C MWTF-3C
6.9 6.3 6.1
808 2317 2530
0.15
0.38
54
59**
536
4.3
15.6
0.17*
77
874
2337
12
24.7
0.12
94
647
2053
10.3
At monitor well MWTF-1C downgradient from the phosphoric acid facilities, the phosphorus.
fluoride and sulfate concentrations are relatively low indicating that groundwater impacts do not
exist in the Croatan formation at this location. The measured constituent concentrations are
also in compliance with Subchapter 2L.0202 maximum contaminant levels with the exception
of a slightly elevated average total dissolved solids concentration of 536 mg/1.
At upgradient monitor wells MWTF-2C and MWTF-3C and well -point WPTF-1D, the
phosphorus, sulfate, and total dissolved solids concentrations are elevated, indicative of
phosphoric acid contaminants. At these locations, the phosphorus concentrations are generally
lower (except at WPTF-1D) than occur in the overlying confined sand layer, but the sulfate and
total dissolved solids concentrations are somewhat greater. Because the direction of
groundwater flow in the Croatan formation is south -southeastward (Figure 2-6), these
contaminants cannot have entered the formation at the location of the phosphoric acid tanks
and piperack. Instead, it is expected that these contaminants entered the Croatan formation
by downward seepage from the overlying confined sand layer after the contaminants had already
migrated northward from the source in this overlying layer.
3.3.3 Castle Hayne Aquifer Groundwater Quality
Groundwater quality at the Castle Hayne aquifer water supply well FERT-1 located within
the tank farm near phosphoric acid Tank 007 (Figure 2-1) is summarized below.
* Disregarding apparently high fluoride concentration of 1.17 mg/1 reported in July 1989.
** Disregarding apparently high sulfate concentration of 292 mg/1 reported in January
1989.
ANY

Texasgulf Inc.
File Number 88-089 3-8
Parameter
• FIELD MEASUREMENTS
Sampling Date
01/89 04/89 07/89
Specific Conductance (p.mhos/cm) 1320 1380 1500
Temperature (°C) 20 20 25
Field pH 7.0 7.2 7.4
Odor None None None
Appearance Clear Clear Clear
• LABORATORY ANALYSES
Lab pH 7.1 7.3 7.6
Total Phosphorus, P (mg/I) 0.030 0.10 0.043
Fluoride, F (mg/1) 0.66 0.59 0.63
Chloride, CI (mg/1) 290 290 303
Sulfate, SO4 (mg/1) 9 10 5
Total Dissolved Solids, TDS (mg/I) 888 796 760
Total Organic Carbon, TOC (mg/1) 5 5 5
As shown, groundwater quality in the Castle Hayne aquifer at well FERT-1 displays background
level phosphorus, fluoride and sulfate concentrations, the major contaminants within phosphoric
acid. Accordingly, as expected, due to the approximately 100-foot thick Yorktown-Pungo River
aquitard separating the Castle Hayne aquifer from the Croatan. aquifer, contaminants from
phosphoric acid leakage/spills have not impacted the Castle Hayne aquifer.
1

ISM tiMJ COW ti=id 1 1 1232= ea area ets r+caszaer. a rev ;
Table 3-1
GROUNDWATER QUALITY AT MONITOR WELL CLUSTER MWTF-1
Parameter
• FIELD MEASUREMENTS
Surficial Aquifer
Croatan Aquifer
Subchapter MWTF-IA MWTF-1B MWTF-IC
2L.0202
MCL 01/89 04/89 07/89 01/89 04/89 07/89 01/89 04/89 07/89
Water Elevation, feet (MSL) x 8.47 9.44 9.14 8.06 8.66 8.66 -3.96 -0.74 -2.19
Specific Conductance, (µmhos/cm) ns 590 380 385 900 910 950 800 800 850
Temperature (°C) x 18 17 27 19 18 25 19.5 19 21
Field pH 6.5-8.5 6.8 6.8 6.7 5 6:>i 5 & , 5.4 6.8 7.2 6.9
Odor x None None None Norte None None None None None
Appearance x Rusty Rusty Milky Clear Clear Clear Clear Turbid Gray
• LABORATORY ANALYSES
Lab pH x 6.8 6.8 6.9 5.7 5.8 5.7 5.7 6.8 7.6
Total Phosphorus, P(mg/1) ns 0.46 0.67 0.064 0.12 0.23 0.23 0.30 0.13 0.025
Fluoride, F(mg/1) 2.0 0.64 0.60 0.90 0.18 0.17 0.45 0.61 0.26 0.28
Chloride, Cl(mg/l) 250 29 8 10 218 218 204 56 52 53
Sulfate, SO4(mg/1) 250 88 92 43 12 22 18 Z ') 59 58
Total Dissolved Solids, TDS(mg/1) 500 372 336 268 593! 5621 460 5541 5Z6 S.2fii
Total Organic Carbon, TOC(mg/1) ns 7 5 5 3 3 3 6 3 4
ns: Not Specified
: Exceeds Subchapter 15 NCAC 2L.0202 Maximum Contaminant Lcvel (MCL)

w1aGi➢ 1® WS- / won ANSI ::9e9 .Ltd wawa ea.+ew *some
'fable 3-2
GROUNDWATER QUALITY AT MONITOR WELL CLUSTER MWTF-2
Parameter
• FIELD MEASUREMENTS
Surficial Aquifer Croatan Aquifer
Subchapter MWTF-2A MWTF-2B MWTF-2C
2L.0202
MCL 01/89 04/89 07/89 01/89 04/89 07/89 01/89 04/89 07/89
Water Elevation, feet (MSL) x 6.82 6.94 5.25 4.14 4.66 4.30 -1.85 -0.45 -1.06
Specific Conductance, (pmhos/cm) ns 1370 2650 1350 2200 2300 2410 2300 2300 2350
Temperature (°C) x 16.5 17 24.5 18.5 18 21.5 19 19 20.5
Field pH 6.5-8.5 64 6.9 60 64. 6.6 6.2 al 6.5 60'
Odor x None None None None None None None None None
Appearance x Clear Milky Clear Clear Rusty Milky Clear Clear Clear
• LABORATORY ANALYSES
Lab pH x 6.3 6.9 6.3 6.3 6.6
Total Phosphorus, P(mg/1) ns 0.090 0.16 0.20 92.0 : 47.3
Fluoride, F(mg/1) 2.0 0.15 0.26 0.14 1.96 1.81
Chloride, Cl(mg/I) 250 71 .62 66 9;76: 321<
Sulfate, SO4(mg/1) 250 135Z C 1091) 259 270;; 444
Total Dissolved Solids, TDS(mg/1) 501 1.14,6: ?339. 840 1212 25$0
Total Organic Carbon, TOC(mg/1) ns 12 12 9 12 8
ns: Not Specified
: Exceeds Subchapter 15 NCAC 2L.0202 Maximum Contaminant Level (MCL)
6.7 6.3 6.5
57.6 12.8 16.6
1.07 0.17 0.16
1287; 78 75
51 .:, :$44
17Q0, ;2308 2272 < 430
9 13 11 12
6.5
17.4
(1.1
72.
78

Parameter
"]'able 3-3
GROUNDWATER QUALITY AT MONITOR WELL CLUSTER MW 1'F-3
• FIELD MEASUREMENTS
Surficial Aquifer - Croatan Aquifer
Subchapter MWTF-3A MWTF-3B MWTF-3C
2L.0202
MCL 01/89 04/89 07/89 01/89 04/89 07/89 01/89 04/89 07/89
Water Elevation, feet (MSL) x 7.45 7.57 7.15 3.13 3.67 3.37 -2.61 -0.49 -1.32
Specific Conductance, (µmhos/cm) ns 1250 1400 1500 2080 2100 2250 2510 2500 2580
Temperature (°C) x 20 20 26.5 29 29.5 30.5 27 28.5 29.5
Field pH 6.5-8.5 ic.5,7; 5.7< 5.7: Lea 6,0 5.9. „6.3 :i.6250.,
Odor x None None None None None None None None Sulfur
Appearance x Clear Turbid Clear Clear Turbid Clear Rusty Clear Milky
• LABORATORY ANALYSES
Lab pH x 5.8 6.1 6.2 6.0 6.2 5.8 6.3 6.4 6.3
Total Phosphorus, P(mg/t) ns 0.24 0.17 0.26 97.5 100.3 86.8 20.2 28.2 25.7
Fluoride, F(mg/1) 2.0 0.14 0.14 0.15 0.18 1.19 0.18 0.14 0.12 0.10
Chloride, Cl(mg/1) 250 283322 324 91 108 112 87 98 98
Sulfate, SO4(mg/1) 250 92 107 94 50¢ $15a 517# 659; 67 A?!.
Total Dissolved Solids, TDS(mg/1) 500 7845 896a 700': 1146 1533; 1365 2018: 2002, r2140.
Total Organic Carbon, TOC(mg/1) ns 11 8 6 7 8 8 11 10 10
ns: Not Specified
: Exceeds Subchapter 15 NCAC 2L.0202 Maximum Contaminant Level (MCL)

dam:# ass ma _ uins mxva
jimagasii
Table 3-4
Parameter
GROUNDWATER QUALITY AT WELL -POINT SAMPLING LOCATION WPTF-1
Subchapter Undifferentiated Surficial Deposits Croatan Formation
2L.0202
MCL WPTF-1A WPTF-1B WPTF-IC WPTF-ID
• FIELD MEASUREMENTS
Sampling Date' x 03/14/89 03/14/89 03/15/89 03/15/89
Sampling Depth (feet) x 3.00 - 3.75 11.25 - 12.00 25.25 - 26.00 46.25 - 47.00
Specific Conductance, (µmhos/cm) ns 3,100 11,000 2,100 2,800
Temperature (°C) x 13 17 22 • 27.5
Field pH 6.5-8.5 1643 i.:4*.!:!1! 6.4 6.5
Appearance x SI. Cloudy Yellowish Clear SI. Cloudy
• LABORATORY ANALYSES
Lab pH x 6.1
Total Phosphorus, P(mg/1) ns 87.0
Fluoride, F(mg/1) 2.0 0.23
Chloride, CI(mg/1) 250 69
Sulfate, SO4(mg/1) 250 1,S62
Sodium, Na (mg/1) ns 280
Total Dissolved Solids, TDS(mg/1) 500
Total Organic Carbon, TOC(mg/1) ns
4.3 6.1 6.2
5,275 34.5 34.3
0.12 0.43 0.37
104 115 195
2,555< S87€ 727
712 256 308
3iS08 20,076 77Qi 11)g1
12 52 11 13
ns: Not Specified
13: Exceeds Subchapter 15 NCAC 2L.0202 Maximum Contaminant Level (MCI.)

PAWIT-2A.S
pH 2" 6.4
P = 0.15-
F -= 0.18
SO4 = 308
TDS et 973
TOC = 11
WPTF-1A 5
pH = 6.2
P = 87.0
F = 0.23
SO4 = 1862
'TDS =•3508
TOO
MWTF-3A
F zr- 0.14-
904 = 99
TDS = 794
TOC r 8.3
-5 MWTF-1A
pH 6.8-
P = 0.40
F = 0.71
SO4 74
TDS = 325-, ;
TOC = 5.7•
GROUNDWATER QUALITY IN SURFICIAL SAND LAYER
100 200
SCALE - 1" 150'
CONCENTRATIONS IN mg/1
N2Mii
fl Ardaman & Associates, Inc.
rcAsConsulting Engineers In Son Methinks,
Foundations, end Marble Twins
SUPPLEMENTAL REMEDIAL ACTION PLAN
TANK FAFIM AREA
7E/IASI:Mir INC.
PHOSPHATE OPERATIONS
AURORA, NORTH CAROUNA
•
loss,: 9M21159
04, Al" Or ARE •101100DIY;
F,LI. IAM

•
1
MWTF-2B S,.
pH q 6.4 —
P =. 65.6/50
F - 1.61
SO4 - 355/636
TDS =•1497/101 ..
TOC=9.7
WPTF-1C
pH=6.1
P=34.5453 ...._....
F = 0.43
SO = 567/P-2-5.
= 77 0/26(20:.
= 11
s MWTF-B--'
H6.0 __..... .-.:,
p v'=94.9/A.-r.........
SO4 m 512--
/"
,.,TDS = 13 a/^•ig JD,;•�
TOC = 7.7 r:nl
S MWTF•1B
pH = 5.6
p = 0.19/%.3
F = 0.27
SO4 = 17/10
• TDS = 536 $
GROUNDWATER QUALITY IN CONFINED SAND LAYER
0 • 100 200
larr 121 Ardaman 6 Associates, Inc.
usaltbe FoyEngineers SoilunI=•
Foundations, NmtYo Twin
SUPPLEMENTAL REMEDIAL ACTION PLAN
TANK FARM A
TEEXASOU FAINC.
PHOSPHATE OPERATIONS
AURORA, NORTH CAROIJNA
r
eSCALE 1•1150'
ycbNOENTRATIONS IN.mg&
WAt^ n
nu w:
9

•
MWTF-2C s
pH = 6.3
P = 15.6
F = 0.17
SO4 = 874fro fey
1DS..= 2337/4..wo
TOC = 12
WPTF-1D 6)
pH = 0.5
P = 34.2
F = 0.37
r 4 = 727431$
= 084,ip
••
pH 6.1
SO4 = 6474.6a— '
36 =
,:3„TOC 10.3
MWTF-1C
pH = 6.9-
P = 0.15
F 0.38
SO4 = 59/0
TOS = 538A4b.
TOC 4.3 .
GROUNDWATER QUALITY IN CROATAN FORMATION
'taNCENTHATithiSIN mg/l
Mr Ardaman & Associates, Inc.
rageNConsulting Enginws In Soil Machanta,
Foundations, and Mantis's Tasting
SUPPLEMENTAL REMEDIAL ACTION PLAN
TANK FARM AREA .
TEXASOULF INC.
PHOSPHATE OPERATIONS
• AURORA; NORTH CAFIOUNA
oft. sy, ABE 01000 or.
a/22M_
,`4, • 57:„Irgni,t;V47f:a.
.d. • , T ;;;:r1S:At'it kAer

1
Texasgulf Inc.
File Number 88-089
Section 4
SUPPLEMENTAL REMEDIAL ACTION PLAN
4.1 Introduction
4-1
This section presents a proposed remedial action system to supplement the remedial actions
already undertaken in the tank farm area. The objectives of and a preliminary design for
the supplemental remedial action system is presented, a time schedule for implementation
is discuss/ill, and a continuing groundwater monitoring plan for evaluation of the effects of
the system on abating groundwater contamination are outlined.
42 Objectives of Supplemental Remedial Action Plan
The objectives of the supplemental remedial action plan are to: (i) minimize and contain
future spills from tanks and associated pumps and pipelines in the tank farm (source
control); (ii) containment of contaminants in the surficial aquifer to protect the adjacent
Pamlico River barge slip from impacts from existing groundwater contamination; and (iii)
removal of contaminated groundwater in the surficial aquifer. To achieve these objectives,
the following three element remedial action system will be undertaken.
• Continue the on -going program of installation of new containment facilities to
contain leaks/spills around the piperack, and phosphoric acid and super
phosphoric acid tanks.
• Install a cut-off wall along the north wall of the tank farm to contain the
contaminants in the surficial aquifer and protect the adjacent Pamlico River
barge slip.
• Install dewatering wells along the inside of the cut-off wall tapping the confined
sand layer to remove existing contaminants.
4.2.1 Installation of New Containment Facilities
Tank 008 has been repaired, as described in Section 1.1, and accordingly the source of
contamination as identified in the August 8, 1988 notice of noncompliance has been
removed. The underground drain line identified in the September 1, 1989 notice of
violation has been repaired, and accordingly this source of contamination has also been
removed.
The new main east -to -west piperack spill containment system is largely installed, and is
scheduled for completion by December 1989. Previously, spills from the piperack could
occur onto the ground with the potential for groundwater contamination. The new spill
containment slab will minimize the potential for spills from the piperack from entering the
groundwater, and therefore to a large degree removes the main east -to -west piperack as a
source of groundwater contamination.

j
i
Texasgulf Inc.
File Number 88-089
4-2
The long-term program to minimize and contain leaks/spills around the phosphoric and
super phosphoric acid tanks is also underway. The relocation and reconstruction of Tank
044 is already complete, and Tank 016 has been relocated with reconstruction scheduled
for completion by December 1989. Presently, construction plans are to relocate and rebuild
Tanks 007, 008, 009 and 013 in 1990, Tanks 015, 017, 019, 021 and 023 in 1991, and Tank
006 in 1992. These tanks are being relocated and rebuilt on new foundations with concrete
spill containment pads and lined drainage ditches. The rebuilding program will both greatly
improve the tank farm spill containment capabilities and minimize the potential for spills
from the tanks.
The installation of the new containment facilities on the piperack and tanks, although a
passive feature of the remedial action system, is an important step in abating groundwater
contamination in the tank farm area. Without source control, future spills and leaks would
continue to introduce new contaminants into the surficial soils Accordingly, the long-term
maintenance of improved groundwater. quality in the tank farm area requires, as much as
practical, the prevention of contaminants from entering the surficial soils.
4.2.2 Installation of Cut -Off Wall
As presented in Section 2.5, the direction of groundwater flow in the surficial sand layer
and confined sand layer is generally northward. At downgradient monitor well clusters
MWTF-2 and MWTF-3, impacts have been detected in the confined sand layer (Section
3.3.1.2). Groundwater quality in the surficial sand layer at the downgradient monitor wells,
however, remains largely unaffected (Section 3.3.1.1).
To contain the existing contaminants in the confined sand layer and any potential future
contamination in the surficial sand layer, an approximately 800-foot long vertical soil-
bentonite backfilled cut-off wall constructed using the slurry trench method will be installed
on the north side of the tank farm (Figure 4-1).* The cut-off wall will be excavated
through the surficial and confined sand layers and keyed into the top of the clayey sand to
plastic clay layer underlying the confined sand layer (Figure 4-2). The cut-off wall will be
designed and constructed to provide an average soil-bentonite backfill thickness of 2.5 feet
and coefficient of permeability of equal to or less than 1x107 cm/sec, or an equivalent ratio
of permeability to thickness (i.e., and therefore the same effectiveness).
Installation of the cut-off wall will prevent the existing northward flow of groundwater
within the surficial aquifer across the tank farm area. Accordingly, to collect the
groundwater flow that would naturally occur across the area and prevent flow around the
ends of the cut-off wall, the existing drainage ditch along the north_ side of the. tank farm
will be used.. to_ collect seepage in the surficial sand layer. Seepage in the confined sand
layer will be collected by the dewatering wells (see Section 4.2.3).
• The alignment of the cut-off wall depicted in Figure 4-1 is conceptual and will be
finalized during design of the containment system to accommodate existing facilities in
the area. The length of the return on the west end of the cut-off wall will also be ,
selected during final design to accommodate field conditions. c'v4 ( .diaa r,rOO. "`A •
r

1
1
1
1
11
1
Texasgulf Inc.
File Number 88-089 4-3
4.2.3 Installation of Dewatering Wells
A series of five dewatering wells on about 150-foot centers tapping the confined sand layer
will be installed on the inside (south side) of the cut-off wall to remove contaminants from
the surficial aquifer. The wells will be operated such that a maximum piezometric water
level of 2 feet (MSL) is achieved in the confined sand layer between the wells, creating a
"low point" in the confined ,sand piezometric water level to prevent flow around the ends
of the slurry wall. It is expected that about 5 to 10 gal/min of groundwater will be removed
by the dewatering system. Because of downward_seepage..from the_surficial_sand layer
(Section 2.5), dewatering of the confined sand layer will also-resultin the_removal-of
contaminants from the,surficial sand layer as they migrate downward into the confined sand
lamer. Groundwater removed by the dewaten cvstem will be_ptuum.1 either_eaosting_��
Cooling Pond No. 1 or No.2. (tiez� ometers will be installed at the locations depicted in
Figure 4-1 to verify that the dewatering system is lowering the piezometric water levels in
the confined sand layer as projected. •
The dewatering wells will be operated as long as needed to lower the groundwater total
phosphorus concentration in the confined sand layer to a t get clean-up value of 5 mg/1.*
Clean-up concentrations are not proposed for other groundwater quality parameters.
Fluoride concentrations in the confined sand layer are presently below the Subchapter
2L.0202 maximum contaminant level (Section 3.3.1.2). Sulfate and total dissolved solids
concentrations are elevated in the confined sand layer, but the brackish water is high in
these constituents and therefore is not impacted by these groundwater contaminants.
Attainment and maintenance of the proposed total phosphorus target clean-up
concentration of 5 mg/1 in the confined sand layer, however, will require the control of
future spills and leaks from the piperack and tanks within the new containment facilities.
Abatement of groundwater contamination in the surficial aquifer will result in the eventual
abatement of groundwater contamination in the underlying Croatan formation as the source
of contaminants in the Croatan aquifer (i.e., contaminants seeping downward from the
surficial aquifer) are removed. Accordingly, measures to directly lower the total phosphorus
concentration in the Croatan formation are not proposed.
43 Time Schedule for Implementation of Supplemental Remedial Action System
The following time schedule is proposed for implementation of the supplemental remedial
action system.
• The detailed design, construction drawings and specifications for the cut-off wall
and dewatering well remedial action system will be submitted to the DEM 120
days after DEM approval of the supplemental remedial action plan.
• The total phosphorus target clean-up concentration of 5 mg/l is the existing total
phosphorus daily average discharge limit for stormwater outfalls 005, 006, 007 and 009
' into the Pamlico River on the north side of the,phosphate operations.
itusk. l&oZi,, .�... &crwyt. 5 4n "AIC%. ZV .w
v

1
1
1
1
4
I
Texasgulf Inc.
File Number 88-089
4-4
• 'The remedial action system will be completed and in operation by January 1, o
1991.
• Installation of the new piperack and tank containment facilities will continue as
presently planned, with completion scheduled for the end of 1992.
4.4 Groundwater Monitoring for Evaluation of Remedial Action System
Groundwater monitoring will continue in the existing nine monitor wells and FERT-1 Castle
Hayne aquifer water supply well on a quarterly basis. After installation of the cut-off wall
and dewatering wells, quarterly monitoring will continue at the MWTF-1 well cluster and
the FERT-1 well, and quarterly water quality measurements will be obtained on
groundwater withdrawn from the dewatering wells. Piezometers installed to monitor water
level elevations in the confined sand layer .will also be read quarterly. Quarterly
determinations of water quality at the dewatering wells will consist of the parameters listed
in Section 3.1.1 as presently undertaken as part of the quarterly monitor well sampling
program. After the target clean-up concentration of total phosphorus is attained, pumping
of the confined sand layer will be stopped. Quarterly groundwater monitoring for a period
of 1 year after the termination of pumping, and thereafter annually, will be implemented
at two of the wells to allow continuing evaluation of the effectiveness of the remedial
action system.

1
1
1
1
1
4
•, .! •
CUT-OFF WALL
DEWATERING WELL
' PIEZOMETERS
• rt
•
_
-2
.• Q • - A.7, •
•
5-
, •
CUT-OFF WALL AND DEWATERING WELL
CONTAINMENT SYSTEM CONCEPTUAL SITE PLAN
200
SCALE le 150'
Ardaman & Associates, Inc.
estAiConsulting Engiren In Soil MoctunIcs.
Foundation', and Materials Toting
SUPPLEMENTAL REMEDIAL ACTION PLAN
TANK FARM AREA
TEXASOULF INC.
PHOSPHATE OPERATIONS
AURORA, NORTH CATIOLJNA
cti,PrAtt
FIGURE 4-1

ELEVATION
0
-10
-20
-30
-40
-50
SOIL-BENTONITE
CUT-OFF WALL
PAMLICO RIVER
BARGE SLIP
0
100
HORIZONTAL DISTANCE
200
DEWATERING WELLS
DRAINAGE DITCH
SULFUR TANKS
PHOSPHORIC
ACID TANKS
FINE SAND TO CLAYEY FINE SAND
CLAYEY FINE SAND TO PLASTIC CLAY
CLAYEY FINE SAND
WITH SOME SHHEELLLFF
CLAYEY TO SILTY FINE SAND •
AND SHELL FRAGMENTS
(CROATAN Fm)
300
\CLAYEY FINE SAND TO
SANDY PLASTIC CLAY
(YORKTOWN Fm)
I
400
500
60
SCHEMATIC CROSS SECTION OF CUT-OFF WAL
AND DEWATERING WELL CONTAINMENT SYSTE

Appendix A
MONITOR WELL INSTALLATION RECORDS
is
11
1

FOR OFFICE USE ONLY
1
NORTH CAROLitA D9ART EKr OF NA11.MAL IL ES ANO COASUNITY DEVELOPMENT
' DIV12110NOF B/IARON.ENTAL MANAGE]N: . ' GROUNDWATER SECTION
•- P.O. SOX 27E57 - RAWE &N. « 27611. PHONE [phone]
WELL CONSTRUCTION RECORD
•WELL NUMBER MNTF1-A
1 DRILLING CONTRACTOR Ardaman 8 Associates, Inc.
1019 STATE WELL CONSTRUCTION
DRILLER REGISTRATION NUMBER PERMIT NUMBER- 06-0071-WM-0156
Quad. No. Serial No.
Lat. Long. Pc
Minor Basin
Basin Code
Header Ent GW-1 Ent.
11. WELL LOCATION: (Show sketch of the location below)
Nearest Town. Aurora, North Carolina County: Beaufort
1
(Road. Community. or Subdivision and Lot No.) Depth DRILLING LOG
From To Formation Description
2. OWNER Texasgulf Inc.
P.O. Box 48 • SEE ATTACHED BORING LOG
IADDRESS
Aurora, Nort(aitruatrol ina No.)
27806
City or Town State Zip Code
13. DATE DRILLED 10-27-88 USE OF WELL Monitoring
4. TOTAL DEPTH 6.4' CUTTINGS COLLECTED 0 Yes ■ No
5. DOES WELL REPLACE EXISTING WELL? ❑ Yes II No
13. STATIC WATER LEVEL: 1.86* FT p above TOP OF CASING.
TOP OF CASING IS O** 0 belowFT ABOVE LAND SURFACE.
17. YIELD (gum): X METHOD OF TEST X
B. WATER ZONES (depth): X
9. CHLORINATION: Type None Amount X
0. CASING:
Wall Thickness
Depth Diameter or Weight/Ft. Material PVC 2" Sch 40 LOCATION SKETCH
From O• D To 3.4 Ft(Show direction and distance from at least two State Roads.
From To Ft or other map reference points)
It From To Ft. SEE ATTACHED MONITOR WELL LOCATION PLAN
1. GROUT:
If additional space is needed use back of form.
Depth Material Method
From 0.0 To 1.7 Ft. Neat Cement Trermie *Static water level on 12-07-88
From To Ft. **Monitor well in leak resistant steel
manhole
12. SCREEN:
Depth Diameter Slot Size Material
From 3.4 To 6.4 Ft. 2 in. 0.01 in. PVC
Fram To Ft. ;n. in. NOTE: Total depth of well, and the casing,
From To Ft in. in. grout, screen, gravel pack and bentonite
seal depths are referenced from the top of
13. GRAVEL PACK: the PVC well casing in the steel manhole.
Depth
Size
From 2.9 To 6.4 F1. 8/16
Material
Silica Sand
From To F t.
.•'REItARKs: '.Bentonite seal from 1.9 to 2.9 feet
t - TDO HEREBV'CERTIFY THAT THIS WELL WAS CON&RUU T D IN CCOR ANCE WITH 15 NCAC 2C. WELL CONSTRUCTION
SD TA ARDS. AND THAT A COPY OF THIS RECOR t AMEN O ED TO E WELL OWNER.
•
12-27-88
SIGNATURE OF CONTRACTOR OF$ AGENT DATE
Submit onninal to Division of Environm.n,,i M.n.n..n.nt mewl nnnv ,n wall n.mnr.
l�t'k1?`'ku _ .e.r'[.r, �. ...,. r..,• ...e �..L�Y44r .i ��.e!.3f.�u§3?r ..U,'.:,.... ,,: Lit%::i;;.

z
FOR OFFICE USE ONLY
NORTH CAROU$1.4 boPARTLENn OF NATURAL RE ES APO cowman. DEVELOPMENT
DIVISION OF E)IVIRpN1..ENTAL MN4M LE_.- DROIRDWATEH SECTION
P.O. BOX 275e7 - RAIEIO/LrLC. 27811. PHONE (a 19) 733-5083
WELL CONSTRUCTION RECORD
WELL NUMBER MWTF1-B
DRILLING CONTRACTOR Ardaman & Associates, Inc.
DRILLER REGISTRATION NUMBER 1019
Quad. No. Serial No.
Lat Long. Pc
Minor Basin
Basin Code
Header Ent GW-1 Ent._.
STATE WELL CONSTRUCTION
PERMIT NUMBER- 06-0071-WM-0156
WELL LOCATION: (Show sketch of the location below)
Nearest Town: Aurora; North Carolina
(Road. Community. or Subdivision and Lot No.)
2. OWNER
ti ADDRESS
Texasgulf Inc.
P.O. Box 48
tr etarolTor Rouna te No.)
Aurora, Nort( �i L27806
City or Town State "Zip Code
10-26-88 USE OF WELL Monitoring
13.5' CUTTINGS COLLECTED' ❑ Yes al No
. DATE DRILLED
4. TOTAL DEPTH
County: Beaufort
Depth DRILLING LOG
From To Formation Description
SEE ATTACHED BORING LOG
DOES WELL REPLACE EXISTING WELL?
. STATIC WATER LEVEL: 2.35* FT
TOP OF CASING IS 0** FT
❑ Yes 11 No
❑ above TOP OF CASING
m below
ABOVE LAND SURFACE.
•
YIELD WPM):X METHOD OF TEST X
. WATER ZONES (depth): X
. CHLORINATION:
0. CASING:
Typo none
Depth
From 0.0. To 10.6
From To
To
From
GROUT:
Amount
X
Wall Thickness
Diameter or Weight/Ft. Material
FI 2" Sch 40 PVC
FI
FI
Depth Material Method
From 0.0 To 8.0 Ft. Neat Cement Tremmie
From To FI.
SCREEN:
Ft:
Depth
From 10.6 To 12.6
"From To FI.
..'From
To Ft
'3. GRAVEL PACK:
Diameter
If additional space is needed use back of form.
LOCATION SKETCH
(Show direction and distance from at least two State Roaos.
or other map reference points)
SEE ATTACHED MONITOR WELL LOCATION PLAN
*Static water level on 12-07-88
**Monitor well in leak resistant steel
manhole
Slot Size Material
Ft. 2 in. 0.01 in. PVC
Depth Size
earn 10.0 to 13.5 F1. 8/16
From To Ft—
pKs;: "Bentonite seal from
O HEREBY 'CERTIFY TAT THIS WELL WAS CONST
STANDARDS. AND THAT A COPY OF THIS RECORD
in.
in.
in. in.
Material
Silica Sand
8.3 to 10.0 feet
NOTE: Total depth of well, and the casing,
grout, screen, gravel pack and bentonite
seal depths are referenced from the top of
the PVC well casing in the steel manhole.
ORI3ANCE WITH 15 NCAC 2C. WELL CONSTRUCTION
TO iE WELL OWNER.
a 12-27-88
SIGNATURE OF CONTRACTOR OR i4GENT DATE
Submit onainal to Division of Envirnnmonmt ,.dn...o.,..ar 'n.. rants On wall ..Wnst

I12. SCREEN.
Depth Diameter Slot Size Idatenal
From 38.7 To 40.7 Ft. 2 in. 0.01 m. PVC
{ From To FI. in. in.
From To Ft in in.
13. GRAVEL PACK:
_ Depth Size Material
• From 36.3 To 42.0 F1. 8/16 Silica Sand
•
From
4. REMARKS:
To Ft.
Bentonite seal from 34.3 to 36.3 feet
NCRTH CAROLI4A MP. ARTLIENT OF NATURAL RES ES AND COMMUNITY DEVELOPMENT
DNISION OF EHVAIONIENTAL IA4AOELOII - GROUNDWATER SECT)ON
P.O. RO2 270e7 - RAUDONPLC. 27611. PHONE [phone]
WELL .CONSTRUCTION RECORD
WELLNUMBER MWTF1-C
IDRILLING CONTRACTOR Ardaman & Associates, Inc.
DRILLER REGISTRATION NUMBER 1019
11. WELL LOCATION: (Show sketch of the location below)
Nearest Town: Aurora, North Carolina County: Beaufort
Depth DRILLING LOG
FOR OFFICE USE ONLY
Quad. No. Serial No.
Lat Long. Pc
Minor Basin
Basin Code
Header Ent GW-1 Ent.
STATE WELL CONSTRUCTION
PERMIT NUMBER. 06-0071-WM-0156
((Ioad. Community, Or Subdivision and Lot NO.)
2. OWNER
IADDRESS
Texasgulf Inc.
From To Formation Description
P.O. Box 48 SEE ATTACHED BORING LOCH
Aurora, NoratruarolinaeNoJ 27806
City or Town State Zip Code
13. DATE DRILLED 10-26-88 USE OF WELL Monitoring
4. TOTAL DEPTH 42.0' CUTTINGS COLLECTED ❑ Yes • l No
DOES WELL REPLACE EXISTING WELL? ❑ Yes la No
1i. STATIC WATER LEVEL: 14. 65* FT 0 above TOP OF CASING.
TOP OF CASING IS O** M below
FT ABOVE LAND SURFACE.
17. YIELD (gpm): X METHOD OF TEST X
1
a. WATER ZONES (depth): X
13. CHLORINATION: Type None
0. CASING:
Amount
X
Wall Thickness
` From 0.0 Depth Diameter or Weight/Ft. Material
To 38.7 Ft 2" Sch 40 PVC
From To Ft
I From To Ft.
1 1. GROUT:
Depth Material Method
If additional space i5 needed use back of form.
LOCATION SKETCH
(Show direction and distance from al least two State Roads.
or Other map reference points)
SEE ATTACHED MONITOR WELL LOCATION PLAN
From 0.0 To 34.1 FL Neat Cement Tremmie *Static water level on 12-07-88
} From To Ft. **Monitor well in leak resistant steel
manhole
NOTE: Total depth of well, and the,casing,
grout, screen, gravel pack and bentonite
seal depths are referenced from the top of
the PVC well casing in the steel manhole.
„TDO HEREBY CERTIFY TRAT THIS WELL WAS CONST CTED IN AC RDAWCE WITH 15 NCAC 2C. WELL CONSTRUCTION
STANDARDS, AND THAT A COPY OF THIS RECORD N EN PROVIDE9JTO TFi WELL OWNER.
fl
12-27-88
SIGNATURE OF CONTRACTOR OR AGENT DATE
Submit orloinal to Division of Envirnmman,,i ,r..... ....... ,.-.. r..n.. In wall nwn•r

1
NORnh •c/u,011lA OOARrie4T CF NATURAL R ; ICES AIO COMMUNITY DEVELOPLFNT
DIVISION OF BNIRON EE71i<AL►WNAO Se4t - GROUNDWATER SECTION
P.O.'DOX 27tta7-RMDGULC. 27611. PHONE (919) 733-Sofia
WELL CONSTRUCTION RECORD
WELL NUMBER MWTF2—A
IDRILLING CONTRACTOR Ardaman & Associates, Inc.
DRILLER REGISTRATION NUMBER 1019
FOR OFFICE USE ONLY
Quad No Serial No.
Lat Long Pc
Minor Basin
Basin Code
Header Ent GW-1 Ent.
STATE WELL CONSTRUCTION
PERMIT NUMBER. 06-0071-WM-0156
1. WELL LOCATION: (Show sketch of the location below)
Aurora, North Carolina County:
iNearest Town: Beaufort
(Road. Community. or Subdivision and Lot No.) Depth DRILLING LOG
2. OWNER Texasgulf Inc. From
To Formation Description
ADDRESS P.O. Box 48 SEE ATTACHED BORING LOG
Aurora, NoratrLarolina No') 27806
i3. DATE DRILLED 10-21-88 USE OF WELL Moni tori rig
City or Town State Zip Code
4. TOTAL DEPTH 13.0' CUTTINGS COLLECTED ❑ Yes ■ No
115. DOES WELL REPLACE EXISTING WELL? 0 Yes v No
5. STATIC WATER LEVEL: 7.36* FT 0 above TOP OF CASING,
■ below
TOP OF CASING IS FT ABOVE LAND SURFACE.
13.25 7. YIELD (gpm): X METHOD OF TEST X -.
8. WATER ZONES (depth): X
,
1
9. CHLORINATION: Type None Amount
10. CASING:
X
Wall Thickness
Depth Diameter or Weight/Ft. Material
From 0.0 To 10.2 Ft 2" Sch 40 PVC
From To Ft
From To Ft.
1. GROUT:
9 Depth Material Method
4 From 0.0 To 7.0 Ft. Neat Cement Tremmie
From To FI.
112. SCREEN:
Depth Diameter Slot Size Material
From 10.2 To 12.2 Et. 2 in. 0.01 in. PVC
From To Ft. in. in.
From To Ft. in. in.
113. GRAVEL PACK:
Depth Size
From 8.9 To 13.0 FL 8/16
From To Ft._
Material
Silica Sand
{&REruR((s: .Bentonite seal from 7.3 to 8.9 feet
If additional space is needed use back of form.
LOCATION SKETCH
(Show direction and distance from at least two State Roaos.
or other map reference points)
SEE ATTACHED MONITOR WELL LOCATION PLAN
*Static water level on 11-30-88
731)0HEREBY'CERTIFY TRAT THIS WELL WAS CON ' RUCTED IN A OR ANCE WITH 15 NCAC 2C. WELL CONSTRUCTION
- STANDARDS, 'AND THAT A COPY OF THIS RECORD EN PROMTO ( ' WELL OWNER. \^ 4l vV1/0 ' �'_ 12-27-88
SIGNATURE OF CONTRACTOR OR
GENT DATE
Submit onoinal to Division of Envirnnmen.m b .ntn.men. +nw ..nnv .n. Well n.rri r,

NORTH CACAROUNA p9ARTLIENT OF NATURAL I SCEs Atc CO1.ed)a)Y Dcvaopwla
�.' OIVti10N Of nwmONme(7AL►ANAGE„ - GRCEINDWATOT SECTION
;<1,A.`81:)( heel RAWGULC. 27611. PHONE (DID) 733-5083
ELL°CONSTRUCTION RECORD
WEtL HUfaBER . STF2-8
bRILLWOCONTRACTOR Ardaman & Associates, Inc.
'DRILLER'RECi1STRATION NUMBER 1019
FOR OFFICE USEONLY
c. .
Quad. No. Serial No.
Lat Long.
Minor Basin
Basin Code
Header Ent GW-1 Ent.
Pc
STATE WELL CONSTRUCTION
PERMIT NUMBER- 06-0071-WM-0156
1
1.' WELL LOCATION: (Show sketch of the location below)
'Neareit Tovrn• Aurora, North Carolina
(Road. Community. or Subdivision and Lot No.)
2. OWNER
IADDRESS
Texasqul f .Inc.
P.O. Box 48
Aurora, NorairLatrolRnae No.)
27806
City or Town State Zip Code
3. DATE DRILLED 10-21-88 USE OF WELL Monitoring
County: Beaufort
Depth DRILLING LOG
From To Formation Description
SEE ATTACHED BORING LOG
4. TOTAL DEPTH 21.5' CUTTINGS COLLECTED ❑ Yes ® No
5.
6.
DOES WELL REPLACE EXISTING WELL?
STATIC WATER LEVEL: 9.80* FT.
TOP OF CASING IS 3.15 FT
7. YIELD (gpm):
•
X
❑ Yes 0 No
❑ above TOP OF CASING
■ below
ABOVE LAND SURFACE.
METHOD OF TEST X
8. WATER ZONES`(depth)• • X
19. CHLORINATION: Type None
10. CASING:
Depth
From 0.0 To 18.8 Ft
From
131 From
! 1.'GROUT:
To Ft
Amount
X
Wall Thickness
Diameter or Weight/Ft. Material
2" Sch 40 PVC
To Ft.
Depth Material
From 0.0 To 15.0 Ft. Neat Cement
From To Ft.
12. SCREEN_
Method
Tremmie
Depth Diameter Slot Size
From 18.8 To 20.8 Ft. 2 in. 0.01 in.
Fran) To Ft. in. _ in.
From To Ft in. in.
13.GRAVEL PACK:
Depth Size
17.0 To 21.5 FL 8%16
To Ft. -
From•
' From,
`4 'REMARKS:'
Bentonite seal from 15.4
TDO HEREBY CERTIFY TAT THIS WELL
-11 STANDARDS. AND THAT A COPY OF THIS
rv1, _Rov(tiodl, V84
Material
PVC
Material
Silica Sand
to 17.0 feet
It additional space is needed use back of form.
LOCATION SKETCH
(Show direction and distance from at least two State Rcacs.
or other map reference points)
SEE ATTACHED MONITOR WELL LOCATION PLAN
*Static water level on 11-30-88
•
WAS CONSTRqL)CTED IN ACCODANCE� WITH 15 NCAC 2C, WELL CONSTRUCTION
RECORD HATS EEN PROVIDED THE 'NW. OWNER.
tabir yifL 12-27-88
SIGNATURE OF CONTRACTOR OR AGENTj DATE
Submit oriainal to Division of Envirnnman,ei a ,..anano. ,,.wall rumor

NORM Ci1R011ihtbErARItmory ,W17tmAL ltEsotl nro = aTY pEvEloPserr
DeAn Orr c .DM Kyµ.Caearf _-OtRCWATEB SECTION
_ is w.�tna Rusoew a lye t 1. PHONE rote) Tao-soea
"-K 1k: K :ice
WELL; CONSTRUCTION RECORD
rrESNUMBERJ I44TF2=L':;.
'' "�` ' '° ''Ardaman 8 Associates, Inc.
Rtl.l. W a'CONTR ALTO R
1019
)KILLER_ REG S_TRATION NUMBER
FOR OFFICE USE ONLY
Quad. No. Serial No
Lat. Long. Pc
Minor Basin
Basin Code
Header Ent. GW-1 Ent.
STATE WELL CONSTRUCTION
PERMIT NUMBER. 06-0071-WM-0156
WELL LOCATION: (Show sketch of the location below)
Nearelet Town:
Aurora, North Carolina county: Beaufort
Depth DRILLING LOG
(Road. Community. or Subdivision and Lot No.)
OWNER Texasgulf Inc.
ADDRESS P.O. Box 48
( it el caror Route No.]
Aurora, Nortrtoltna 27806
City or Town State Zip Code
DATE GRILLED 10-22-88 USE OF WELL Monitoring
TOTAL DEPTH 42.5' CUTTINGS COLLECTED ❑ Yes II No
DOES WELL REPLACE EXISTING WELL? ❑ Yes II NO
STATIC WATER LEVEL: 16.03* FT 0 above TOP OF CASING.
323 ■ below
.
TOP OF CASING IS FT ABOVE LAND SURFACE.
. YIELD (gpm): X METHOD OF TEST X
. WATER ZONES (depth):
X
.CHLORINATION: Type None Amount X
J. CASING:
Wall Thickness
Depth Diameter or Weignt/Ft. Material
From 0.0 To 39.7 Ft 2" Sch 40 PVC
From To Ft
From To Ft.
t. GROUT:
From To Formation Description
SEE ATTACHED BORING LOG
If,additional space is needed use back of form.
LOCATION SKETCH
(Show.direction and distance from at least two State Roacs.
or other map reference points)
SEE ATTACHED MONITOR WELL LOCATION PLAN
Depth Material Method
From 0.0 To 36.0 FI. Neat Cement Tremmie *Static water level on 11-30-88
From To Ft.
12. SCREEN:
Depth Diameter - Slot Size Material
From 39.7 To 41.7 Ft 2 in. 0.01 in. PVC
From To Ft. in. in.
'(
From To Ft in. in.
13. GRAVEL PACK:
Depth Size Material
From 36.0 To 42.5 Ft. 8/16 Silica Sand
From To Ft.
'.REMARKS: Bentonite seal from 36.3 to 38.0 feet
TDO HEREBY'CERTIFY THAT THIS WELL WAS CONST CTED IN ACC ROANCE WITH 15 NCAC 2C, WELL CONSTRUCTION
L .', ..STANDARDS; AND THAT A COPY OF THIS RECORD N PROVIDED O WELL OWNER.
,O . !n- 12-27-88
DATE
SIGNATURE OF CONTRACTOR OR A
gihmil onninal to flivieinn of Pnvirnn...n.,..., .•

•
FOR OFFICE USE ONLY
1
NORTH CNVJi11f1 DEPARTMENT,OF NATURAL. I IRCES AND COLA/1ATY DEVELOPIANT
DMSION OF 9iWiON.®(TAL ANHAGE.:.=.;. GROl10WATER SECTION
;P.O. BOX 276S7 - RALEIGH.tLC. 27611. PHONE [phone]
WELL CONSTRUCTION RECORD
-WELL-NUMBER MWTF3-A
DRILLING CONTRACTOR Ardaman & Associates, Inc.
DRILLER REGISTRATION NUMBER 1019
i1. WELL LOCATION: (Show sketch of the location below)
Nearest Town- Aurora, North Carolina County: Beaufort
(Road. Community. or Subdivision and Lot No.)
Depth DRILLING LOG
From To Formation Description
2. OWNER Texasgul f Inc.
Quad. No. Serial No.
Lat Long. Pc
Minor Basin
Basin Code
Header Ent GW-1 Ent.
STATE WELL CONSTRUCTION
PERMIT NUMBER: 06-0071-WM-0156
ADDRESS
P.O. Box 48 SEE ATTACHED BORING LOG
Aurora, NoratrLatrolinaeNO') 27806
City or Town State Zip Code
3. DATE DRILLED 10-24-88 USE OF WELL Monitoring
4. TOTAL DEPTH 13. 91 CUTTINGS COLLECTED ❑ Yes ® No
5. DOES WELL REPLACE EXISTING WELL? ❑ Yes I■ No
6. STATIC WATER LEVEL: 4.62* FT 0 above TOP OF CASING.
TOP OF CASING IS 0** FT A■VBOVEow
E LAND SURFACE.
7. YIELD (gpm)- X METHOD OF TEST X
B. WATER ZONES (depth): - X
9. CHLORINATION: Type None
10. CASING:
Amount X
Wall Thickness
Depth Diameter or Weight/Ft. Material
From 0.0 To 10.9 Ft 2" Sch 40 PVC
From
From
11. GROUT:
Depth Material Method
To -Ft
To Ft.
From
From
j.
2. SCREEN:
II additional space is needed use back of form.
LOCATION SKETCH
(Show direction and distance from at least two State Roads.
or other map reference points)
SEE ATTACHED MONITOR WELL LOCATION PLAN
0.0 To 7.8 FI. Neat Cement Tremmie *Static water level on 12-07-88
To Ft. **Monitor well in leak resistant steel
manhole
Depth Diameter Slot Size Material
From 10.9 To 12.9 Ft 2 in. 0.01 m. PVC
"Frgm To F1. in. in. NOTE: Total depth of well, and the casing,
From To Ft. in ;n. grout, screen, gravel pack and bentonite
ti2GR4EL seal depths are referenced from the top of
a s{„ Depth the PVC well casing in the steel manhole. '
Size Material
torn ""9.6 in 13.9 Ft 8/16 Silica Sand
rom c. 1.:: ... To Ft.-
RKs:- Bentonite seal from 8 1 to 9 6 feet
DO HEREBYCERTIFY TAT THIS WELL WAS CON-FUCTED IN A COA NCE WITH 15 NCAC 2C. WELL CONSTRUCTION
TAAO3.`AND THAT A COPY OF THIS RECORD EN PROM TO WELL
OWNER
a 12-27-88
•
SIGNATURE OF CONTRACTOR OR AGENT DATE
Submit original to Division of Envlrrininnn,,, I .wn..• wA en..., ,n who al lwu.w"r o'tt
1

•
FOR OFFICE USE ONLY
NORTH CaROUNEUa PAFITI R OF NATURAL RESOUR rto COt.188s+7r DEVELOPMENT
DIVISION OF ENVIROMc(7AL, LMIAGE ENT - SECTION
P.O.W
OOX 27ee7- RAIi70LC. 27e11. PHOIE (010) 733-50e3
WELL CONSTRUCTION RECORD
+ELL NUMBER Mb1TF3=B
RILLING CONTRACTOR Ardaman & Associates, Inc.
RILLER REGISTRATION NUMBER 1019
Quad. No. Serial No
Lat. Long. Pc
Minor Basin
Basin Code
Header Ent GW-1 Ent.
STATE WELL CONSTRUCTION
PERMIT NUMBER: 06-0071-WM-0156
WELL LOCATION: (Show sketch o1 the location below)
Aurora, North Carolina
Nearest Town:
OWNER
ADDRESS
(Road. Community. or Subdivision and Lot No.)
Texasqulf Inc.
P.O. Box 48
(Street or Route No )
Aurora, Nortn arollna • 27806
DATE DRILLED
TOTAL DEPTH
City or Town ' State Zip Code
10-24-88 USE OF WELL Monitoring
27.2' CUTTINGS COLLECTED' ElYes IINo
DOES WELL REPLACE EXISTING WELL?
STATIC WATER LEVEL: 9•12* FT
TOP OF CASING IS 0** FT
YIELD (gem):
ElYes II No
'IDabove TOP OF CASING.
El below
ABOVE LAND SURFACE.
X METHOD OF TEST X
WATER ZONES (depth): X
CHLORINATION: Type None
CASING:
From
From
From
.. GROUT:
Amount
X
Wall Thickness
Depth Diameter or Weight/Ft.
0.0 To 24.2 Fl
To Ft
To Ft
Material
2" Sch 40 PVC
Depth Material Method
From 0.0
From
1. SCREEN:
i
To 22.3 Ft. Neat Cement Tremmie
To Ft.
Depth
From 24.2 To
Diameter
26.2 FL 2
ram To Fl.
From
I..GRAVEL PACK:
To Ft
Depth Size
tOm 23.7 To 27.2 FI. 8/16
roii'•r• To Ft.
se
REmA(_y
r4<Bentonite seal from 22.6 to 23.7 feet
=-TDO HEREBYCERTIFY THAT THIS WELL WAS CONS
-
STANDAppS, ANO THAT A COPY OF THIS RECORD HQS
Slot Size Material
in. 0.01 in. PVC
in. in.
in
in.
Material
Silica Sand
County: Beaufort
Depth DRILLING LOG
From To Formation Description
SEE ATTACHED BORING LOG
If additional space is needed use back of form.
LOCATION SKETCH
(Show direction and distance from at least two State Roads.
or other map reference points)
SEE ATTACHED MONITOR WELL LOCATION PLAN
*Static water level on 12-07-88
**Monitor well in leak resistant steel
manhole
NOTE: Total depth of well, and the casing,
grout, screen, gravel pack and bentonite
seal depths are referenced from the top of
the PVC well casing in the steel manhole.
3CTED IN ACC RDAN E WITH 15 NCAC 2C. WELL CONSTRUCTION
E N PROVIDED O THE; ELL QWNER.
�tfl%1,t' Yrfll( 12-27-88
SIGNATURE OF CONTRACTOR OR AGE
DATE
Cnhmn nnninal In fliviainn of Fnvirnnmen,.• a ..... _ ••• ...•• ^^-•• ••• .pee n•en or

Frain
,r '.t:• From
li�i
NORTH rC ,Itiz >1A�.p3t 1iuf .%f " P r I '.: ..
/uarrt tr oF/IA IFJ .'ES Alto'eo&ware oevaopmerr
:.ayµ•'/' .IT*
tlIW6ln4 OF BNiWIW4T&L IWM0F/A GROUOWATER SECTION
i I.O-DOi27a87-(INFSIYi 27e11. PIfOIE (919) 733-S053
WELL'CONSTRUCTION RECORD
WEU. NUtdSEq 4-MtJTF3-C g::,
i DRILLING CONTRACTOR fArdaman
r .
DRILLER '' REGISTRATION NUMBER
& Associates,
1019
Inc.
FOR OFFICE USE ONLY
Quad. No. Serial No.
Lat Long. Pc_
Minor Basin
Basin Code
Header Ent GW-1 Ent.
STATE WELL CONSTRUCTION
PERMIT NUMBER: 06-0071-WM-0156
i.•WELL LOCATIONleShow'Sketch of the location below)
NearestTown: - Aurora; - North Carolina
(Road. Community. or Subdivision and Lot No.)
2. OWNER
ADDRESS
Texasgulf Inc.
P.O. Box 48
Aurora, Nort(nit`�arolinae No.) 27806
City or Town State Zip Code
.. DATE DRILLED 10-24-88 USE OF WELL Monitoring
4. TOTAL DEPTH 47.7' CUTTINGS COLLECTED' 0 Yes M No
DOES WELL REPLACE EXISTING WELL? ❑ Yes ® No
. STATIC WATER LEVEL: 14.58*
County: Beaufort
Depth DRILLING LOG
From To
Formation Description
SEE ATTACHED BORING LOG
FT ❑ above TOP OF CASING.
below
TOP OF CASING IS O** FT ABOVE LAND SURFACE.
YIELD (gpm): X METHOD OF TEST X
WATER ZONES (depth) X
. CHLORINATION: Type None Amount X
10. CASING:
1
From
From
From
1. GROUT:
Depth
0.0 To44.7
To
To
Wall Thickness
Diameter or Weight/Ft. Material
Ft 2" Sch 40 PVC
Ft
Ft
Depth Material
From 0.0 To 41.8 Ft. Neat Cement
From
'.SCREEN:
Depth
From 44.7 To 46.7
To
To
:?;GRAVEL PACK:
Diameter
Ft. 2
Ft.
F1.
Depth Size
From +'.43.5 To 47.7 Ft. 8/16
',From ' - To - Ft.-
aA�ucs:'-'Bentonite seal from 42.1 to 43.5 feet
HEREBY CERTIFY TRAT THIS WELL WAS CO
,STA IDARDS, AND THAT A COPY OF THIS RECORH
,f,) w
Method
Tremmie
11 additional space is needed use back of form.
LOCATION SKETCH
(Show direction and distance from al least two State Roads.
or other map reference points)
SEE ATTACHED MONITOR WELL LOCATION PLAN
*Static water level on 12-07-88
**Monitor well in leak resistant steel
manhole
Slot Size Material
in. 0.01 in. PVC
in. in.
in in.
Material
Silica Sand
NOTE: Total depth of well
grout, screen, gravel pack
seal depths are referenced
the PVC well casing in the
UCTED IN A
, and the casing,
and bentonite
from the top of
steel manhole.
CORD NCE WITH 15 NCAC 2C. WELL CONSTRUCTION
I TO r, E WELL OWNER.
SIGNATURE OF CONTRACTOR OR AGENT
Submit orioinal to Division of Envirnmm�nrei u
12-27-88
DATE
...n..• _-......... la ...all a ••••.

Appendix B
STANDARD PENETRATION TEST BORING LOGS

1
1
l
1
1
1
�.'.... ` . BORING LOG
ARDAMAN & ASSOCIATES, INC.
BORING NO. TF-1
TOTAL DEPTH 60.0 ft
SHEET 1 of 2
PROJECT Remedial Action Plan - Tank Farm Area FILE NO. 88-089
CLIENT TexasguIf Inc
BORING LOCATION Phosphate Qperations
COUNTY Beaufort STATE North Carolina . ELEVATION 10.5'- feet (MSL)
DATE STARTED 10-25-88 DATE COMPLETED 10-25-88 BORING TYPE Rotary wash
with mud
DRILLER/RIG Shanawav do Prather/CME-55 LENGTH/TYPE CASING 45 ft/6" dia hollow
stem auger
WATER TABLE DEPTH: 1st x DATE x TIME x
2nd x DATE x TIME x
_
REMARKS Borehole grouted with cement-bentonite grout; Field Inspector: Ellingsworth
Depth
Standard Penetration Tat T
nSTN 0-1sas
Lab Data
Soil Description rag Remarks
(Unified Cls sification)
tU
Unduwed
samcw
L.
CI
u as
u
w
Blows/6"
N
Value
Sample
No.
NSt
(%)
-200
(%)
LL
(%)
pI
(%)
-
3-6-6
12
1
- Light brown fine sand (SP)
2.0'
-
1
-17-11-11
22
2
22
13
/.
/ /
Light gray fi.te sand with small balls of
clayey fine sand (SP)
5 0'
_
__
_
8-6-3
9
5-4-6
10
3
5.5' Dark brown clayey fine sand with roots (SC)
2
-
-
4
24
59
/
_ Gray and yellowish -brown sandy clay (CL)
8.0'
_
Dark brown plastic clay (CH)
9.5'
_
-
2-4-10
14
5
3
10
6
23
20
/
/
�
11.0' Brown silty fine sand (SM)
q
_
-
_ Brown clayey fine sand with seams of fine
sand (SC)
-
15
2-1-5
6
7
31
47
/1/
5.-
-
-
18.0'
- Dark gray sandy clay with seams of fine sand (CH)
_
6
-
20
5-4-2
6
8
7
-
2"0'
- Greenish -gray plastic clay with shell (CH)
-
-
-
25
2-3-3
6
9
8
_28.5'
-
9
0
3-3-4
7
10
34
25
//,-/
Greenish -gray clayey fine sand with
shell (SC)
31.3't
-
-
10
-
-
-
Greenish -gray clayey fine sand and shell
= (SC and shell)
—
I
35_,
4-5-5
10
11
_
if
- 38.5'
T.
-..:;'.
FM
i0 t
ta-� ..:,/
7
12
25
16
/
/
Greenish -gray silty ime sand with traces
- of clayey fine sand and ahaU CM
•

ij
BORING LOG
ARDAMAN & ASSOCIATES, INC.
BORING NO. TF-1
TOTAL DEPTH 60.0 ft
SHEET 2 OF 2
PR0SECT4 Reaiadlel Adtlaii Plat -Tank Farm Area
Cun1T K'. Teawacult lne
FILE NO. 88-089
_Oiplh i .'v- r Mnd iwntpa Test
Lab Data
' 13
IS
Sample
No.
NM
(%)
-200
(%)
LL
(%)
Soil Description and Remarks Undttu.e,me
(Unified Classification)
Greenish -gray silty fine sand with traces of
- 42.0' clayey fine sand and shell (SM)
17-3615
69
13
Ji
15
16
17
16
19
20
SO
Clio al loss of drilling fluid circulatio0.g.1 42'
Gray slightly silty medium to fine sand with
some shell fragments and thin layers of cemented
sand (SM)
47.0'
4-3-5 7
14
Greenish -gray clayey fine sand (SC)
- 52.5'
8
15
Greenish -gray clayey fine sand with thin
layers of greenish gray sandy clay (SC)
- 56.5' -
8
16
Greenish -gray sandy clay (CL)
65
2)
Boring terminated at 60.0 feet
Samples .

11
3
1
a
_, BORING LOG
ARDAMAN & ASSOCIATES, INC.
BORING NO. TF-2
TOTAL DEPTH 60.0 ft
SHEET 1 OF 2
PROJECT Remedial Action Plan - Tank Farm Area FILE NO. 88-089
-,l
CLIENT Texasgutf Inc.
BORING LOCATION Phosphate Operations
COUNTY -Beaufort STATE North Carolina ELEVATION 10.9= feet (]ISL)
DATE STARTED 10-20-88 DATE COMPLETED 10-20-88 BORING TYPE Rotary wash with mud
DRILLER/RIG Shanaway . Prather/CME-55 LENGTH/TYPE CASING None
WATER TABLE DEPTH: 1st x DATE x TIME x
,
2nd x DATE x TIME x
REMARKS Borehole grouted with cement-bentonite grout; Field Inspector: Ellingsworth .
Depth
Standard
STSI Penetration
T� .
Lab Data
>:
e
E
-N
4.
Blows/6"
Value
Sample
No.
NM
(%)
-200
(%)
LL
(%)
PI
(%)
p Soil Description and Remarks
(Unified Classification)
Undisturbed
Samples
1
-
4-12-18
30
1
- Brown fine sand with traces of shell (SP), fill
fix
*1
k
Th5-21-22
2.0' ,
43
2
Grayish -brown tine sand with traces of shell
5
}9-29-14
43
3
(SP), till
4.0'
13-13-21
34
4
-
— Gray slightly silty fine sand with traces of
6 0, shell and wood (SP-SM), fill
2
3
-
-
30 _
Gray aria yellowish -brown silty fine sand
-7.5' (SM), till
- Gray and yellowish -brown clayey fine
sand
(SC), fill
4-14-19
33
6
22
21
//
9.5'
11.0' Gray silty fine sand (SM), fill
4,
_
-
-
15
- Gray clayey fine sand with thin layers of =:
13.0' sand (SC), fill
3-2-5
7
7
36
35
/
%
/
Dark brown clayey tine sand with thin lenses of
- gray fine sand (SC)
5
5
-
-
20
_
-17.5'
-
- Gray slightly silty fine sand
2-11-20
31
8
20
6
//
_ (SP-SM)
7
-
-
25
21.0'
_ Dark gray clayey fine sand with thin lenses
of gray fine sand and traces of shell
fragments (SC)
1-1-1
2
9
35
31
/
/-
/
/
8
9
_
_
-
30
26.5'
Gray clayey fine sand with shell fragments
- and cemented sand (SC)
4-2-2
4
10
-
'
10
Y".
-
'35
-31.5'1
-
Gray clayey fine sand with cemented sand and
- shell fragments (SC and shell)
5-4-4
8
11
-
13
�f• ii
4 i.
;-
'
rl
-37.5' ..
12-f-8, �
-prit
-, 15'
12
24
24
/f_
Gray slightly clayey (Inc sand with shell (SC)
} 1:
e.
s
f5111 0 AswelelN, Inc. . _. `,� x)r'r"�'p
rpoiwat VYlYa*,, . _.• .. .. .. S'. .1.%ii9��

BORING LOG
.ARDAMAN & ASSOCIATES, INC.
BORING NO.
TOTAL DEPTH
SHEET 2
TF-2
60.0 ft
OF O
PROJECT
CLIENT
• Remedied Action Plan -Tank Farm Area
FILE NO. 88-089
•, Tee
,Depth
. Maori
:... ...:.:/04_
'Vat um Test
. tilt,
Lab Data
Soil Description and Remarks
(Unified Classification)
undisturbed
samples
rr
'S
�'
;;;
i
P,
=. • ;:
BloWfa/6•
N
Value
Sample
No.
NM
(%)
-200
(%)
LL
(%)
PI
(%)
. j
-
-42.5'
Gray slightly clayey fine sand with shell (SC) .•
-
}t"
4
_
4S
Gray clayey fine se id with shell and
thin layers of grer.nish-gray clay (SC)
_
44 -11
17
13
-
-46.8't
1
-
-
-
_
Gray clayey fine sand with shell (SC)
_
-
_
.5-7-8
15
14
-
18
17
50
' -
55
- 51.5'
-
Greenish -gray clayey fine sand with shell (SC)-
-
-
_
-
•3-3-6
9
15
:
.•
60
- 56.5'
18
-
Greenish -gray sandy clay (CL)
-
-
5-6-6
12
16
9
65
'
1
b1r.M�1
...
-
-
-
—
-
-
-
_
--
—
Boring terminated at 60.0 feet
-
1'
22
:.a
0'
_
ri
•
24
4i5y}
rt
F e
r

BORING LOG
ARDAMAN & ASSOCIATES, INC.
BORING NO. TF-3
TOTAL DEPTH 60.0 ft
SHEET 1 OF 2
PROJECT Remedial Action Plan -Tank Farm Area FILE NO. 88-089
CLIENT Texa tf lnr
BORING LOCATION Phosphate Operations
COUNTY Reanirrt STATE North Carolina ELEVATION 12.0`- feet (MSL)
DATE STARTED 10-20-RR DATE COMPLETED 10-21-88 BORING TYPE Rotary wash with mud
DRILLER/RIG Shanaway & Prather/C6IE-55 LENGTH/TYPE CASING None
WATER TABLE DEPTH: 1st x DATE x TIME x
2nd x DATE r TIME x
REMARKS Rnrehole muted with cement-bentonite Prout• Field InSDertor: F]]invsworth_
Depth
P
Standard
ASTN
Penetration
D-15!
Test
Lab Data
-
u
0
m
Blows/6^
N
Value -
Sample
No.
NM
(%)
-200
(%)
LL
(%)
PI
(%)
Soil Description and Remarks ' ..
(Unified Classification)
Undbturoea
s°'"P�'
1.0' Brown fine sand (SP), fill
-
4-16-8
24
1
Light brown to yellowish -brown slightly
40
2'
- 2.5' silty fine sand (SP-SM), fill
-
1
13-18-22
fine
-
18-24-16
40
Yellowish -brown slightly clayey •
4,0' snnd (SC). fill
,
_
5
Gray clayey fine sand (SC), fill
_
11-15-19
34
3
—
2
-
8.0'
3
-
6-5-4
9
4
- Gray clayey fine sand with traces of gray
10
-
fine sand (SC)
"•777-
= '{.
-•
11.0'`-
•
_ Brown silty fine sand (SM)
_-
`.r..,
2-1-1-1-
Dark brown sandy(CH)
�— clay
17.0't
-
- Brown plastic clay (CH)
-
.Hammer
7
—23.0'
-
1`a
ZS^
`pEs-S.
10
g
20
3
Gray medium to fine sand (SP)
-
'1.,
if.?''''
e
- 27.5'
y.-
r�
-
1
r,akc;'�ti1,:.
9
Dark gray clayey fine sand (SC)
—
-
Y '
f?t
-
_
-
9 ++��
s
10
40
31
�././
-
-
ii
n
�i
dt5
<r
p
y
_
38.0'
-
..
r�J
S ,.� ^."
aT.
Q
rll
_ Gray clayey fine sand and shell (SC and shell) _
-
4^
�iR-
'�
)Tgf�Y!tai•r�'„ ..Me..
i�
1. ♦,� MRL ., tit"
i
l'1' ytkV.ay p z a 4.. �4Y y ♦�-
S

Boring terminated at 60.0 feet
Soil Description and Remarks Undisturbed
Samples
fiaLS
PROJECT
CLIENT
Depth
0
w
13
45
14
15
50
BORING LOG
ARDAMAN & ASSOCIATES, INC.
BORING NO. TF-3
TOTAL DEPTH 60.0 ft
SHEET 2 OF 2
Remedial Action Plan -Tank Farm Area FILE NO. 88-089
Texasgulf Inc
Vanden, Penetnuan Test
7fl4 D-1}Id
Blows/6"
N
Value
Sample
No.
NM
(%)
Lab Data
-200
(%)
LL
(%)
PI
(%)
41.8'r
(Unified Classification)
Gray clayey fine sand and shell (SC and shell)
5-7-7
14
12
34
16
// ^
7-11-19
30
13
Shell fragments and gray silty fine sand
(shell and SM)
47.0'
_ Gray silty fine sand and shell with thin
lenses of cemented sand (SM and shell)
16
53.0'
55�
3-3-3
6
14
Greenish -gray clayey fine sand with shell (SC)
17
18
60
- 56.5'
4-5-6
11
15
Light greenish -gray clayey fine sand (SC) t
19
65.
70
3