NCD991278953_20030313_National Starch & Chemical Corp._FRBCERCLA RA_Overburden Trenching and Fracture Mapping-OCR

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BLASLANO, BOUCK & LEE, INC.
engineers 8: sclentlsls
Translnitted Via Federal Express
March l3, 2003
Mr. Jon Bomholm
Remedial Project Manager
United States Environmental Protection Agency
6l Forsyth Street, S.W.
Atlanta, GA 30303-3104
Re: Overburden Trenching and Fracture Mapping
. National Starch & Chemical Company
Cedar Springs Plant Site
Salisbury, North Carolina
BBL Project#: 05008.002
Dear. Mr. Borhholm:
MAR 2 5 2003
. I.
Blasland, Bouck & Lee, Inc. (BBL) has conducted overburden trenching for National Starch ~ Chemical
Company's Cedar Springs Plant located in Sahsbury, North Carolina. Figure I presents a Site Location Map.
The purpose of this activity was to verify the information obtained from the Fracture Trace Analysis (BBL
2002) and site locations for additional monitoring wells to be installed as part of the Remedy Investigation for
Operable Unit One. A brief review of geology and hydrogeology at the site can be found in the Fracture Trace
Analysis.
07932188
Overburden trenching and fracture mapping began the week of October 28, 2002. Field activities were
recommended after a fracture trace analysis performed using aerial photos indicated:
• A major fracture trace set is present trending northeast/southwest. This fracture set should have a
strong influence on groundwater flow since it is almost parallel to the slope of the land surface.
• Other minor fracture trace sets are present at the site, three sets in the area between the trench area and
the Unnamed Tributary. These sets are less likely than the major set to affect groundwater flow. but
may have a significant influence on groundwater flow if pumping occurs along the fractures; and
• Field verification is necessary to confirm the presence and location of the apparent fractures.
Locations of overburden trenches were selected based on the results of the Fracture Trace Analysis and site
access. The-locations of the fracture trace sets and initial trenching locations are shown on Figure 2.
The objective of the overburden trenching was to identify features in the overburden that may be indicative of
bedrock fractures trending from the Trench Area to the Plume Periphery Area. Based on the information
collected during the trenching activities, monitoring wells will be installed to identify the pathway of volatile
organic compounds (VOCs) from the Trench Area to the Plume Periphery Area.
8 South River Road • C1anbury. NJ 08512-9502
Tel [phone] • Voice Moil [phone] • Fox [phone] • www.bbl-inc.com • offices notiorw1ie1e
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Mr. Jon Bomholm
March 13, 2003
Page 2 of 8
FIELD ACTIVITIES AND RESULTS
The trenching activities were accomplished using a trackhoe. The bucket was extended to dig the trench. The
average depth of the trenches was approximately 6 to 8 feet deep, however in some locations the trenches were
dug to depths up to 14 feet. The trenching activities were documented in field notes recorded by a BBL
geologist and in pictures. The field notes are included as Attachment I to this report. A CD containing all of
the photographs taken during the trenching effort is included as Attachment 2. Photo I shows the trench in an
average location. After each trench had been evaluated and documented, it was filled in with the removed soil,
graded to the preexisting condition, and seeded. Photo 2 shows the location of a trench upon completion of
activities.
Figure 3 shows the locations of the trenches with analytical results for volatile organic compounds (VOC)
from the December 2002 groundwater sampling event and historical results from monitoring wells not
monitored during the annual event. VOC impacts are generally bounded to the southeast by NS-27, EX-03,
and NS-30. The trenches were performed in the area of the site between the Plume Periphery Extraction Wells
and the Trench Arca. A narrative of the observations of each trench is presented below.
Trench I
Trench I began approximately 100 feet southeast of extraction well EX-01. The root zone extended
approximately 2 feel below the ground surface. A red-brown saprolitic clay with the natural fabric intact was
found below the root zone. Approximately 8 feel below ground surface (bgs) a light brown saprolite material
was encountered.
Features of potential interest were noted at the following locations:
07932188
• About 5 feet into trenching Trench I an almost vertical feature was observed. Photo 3 shows the
approximately I-inch trace present on both sides of the trench.
• Approximately l05 feet into Trench I, a zone with black mineral content was observed on the
south side of the trench.
• Quartz intrusions into the saprolite were observed at approximately 127 and 139 feet into Trench
I. These quartz intrusions are shown in photos 4 and 5. The location of these intrusions is shown
on Figure 2 at location A.
• At approximately 160 feel into Trench I a strong gray-white fabric was observed on the north
wall of the trench going across the trench floor. The trench was deepened to 14 feet bgs at
·approximately 200 feet into Trench I. A grayish sand-like textured material with some rock was
observed 12 feet bgs.
• Between 210 and 220 feet into Trench I, black and white lineations were observed in the trench.
Photo 6 shows these lineations.
• Photo 7 shows quartz veins that were observed between 260 and 270 feet into Trench I. Moisture
was observed on the trace of these veins. These int":sions are also marked with an A on Figure 2.
BLASLAND, BOUCK & LEE. INC.
engineers & scientists
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Mr. Jon Bomholm
March 13, 2003
Page 3 of 8
• At 285 feet into Trench I, a I-inch near vertical quartz intrusion was observed on the north wall
of the trench (Photo 8). At this same location, an intrusive block of white-tan quartz was
observed with red-brown saprolite above and below the quartz (Photo 9).
• Between 340 and 380 feet into Trench I, there were many observations of irregular quartz
intrusions and some black mineralization. This higher frequency of intrusions in the saprolite
occurred as Trench I extended toward the swale containing extraction well EX-02 and monitoring
well NS-26.
Trench I was terminated after approximately 400 feet.
Trench 2
Trench 2 was initiated off set approximately 30 feet to the northeast of the terminus of Trench I. Trench 2
is located across the swale approximately half-way between monitoring well NS-26 and extraction well
EX-02. The general soil profile in Trench 2 is a red-brown clay with fine sand and organics from Oto 2
feet bgs, from 2 to 3 feet bgs the soil grades to gray with little purple clay, little sand and quartz gravel and
cobbles, at depths greater than 3 feet bgs there is medium to coarse grained gray-white saprolite.
Features of potential interest were noted at the following locations:
• A quartz intrusion was observed approximately 15 feet into Trench 2. Photo lO shows an ultra-
mafic fine-grained black rock intruding into the saprolite on both sides of the trench. ·
• Approximately 40 feet into Trench 2, medium-grained massive, mafic surface boulders with
irregular breaks are encountered from 4 to 6 feet bgs. These rocks are able to be broken and
removed with the backhoe. Generally planar fractures are observed within these rocks but no
dominant fracture orientation is observed. These rocks continue for approximately 30 feet.
Photbs 11, 12 and 13 show the rocks observed in this location.
• As Trench 2 crossed the swale and the ground surface inclined, quartz intrusions were observed
between 90 and 120 feet into Trench 2. These intrusions were approximately 4 feet bgs.
Trenches Ji 4 and 5
Trenches 3, 4 and 5 were performed in the vicinity of monitoring well NS-29. Trench 3 began near the
access road approximately 70 feet northeast of NS-29 and went in a south-southeast direction. The.
subsurface of Trench 3 is composed mostly of extremely weathered diorite altered in place. Many feldspar
intrusions were observed in Trench 3.
Features of potential interest were noted at the following locations:
07932188
• A fault was observed in the intrusion seen approximately 8 feet into Trench 3 (Photo 14).
• Approximately 20 feet into Trench 3 the diorite was mixed with a granitic-type rock which was an
altered greenish-black.
• A fracture was observed approximately 20 feet into Trench 3.
BLASLAND. BOUCK & LEE, INC.
onglneers & 3c/entlsts
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Mr. Jon Bomholm
March 13, 2003
Page 4 of 8
• The feldsparhic intrusions observed in Trench 3 were generally a pale, tan-white, medium-course
grained and less weathered with frequent granular black minerals.
Trench 4 was approximately 30 feet beyond the terminus of Trench 3. The upper 2 feet of Trench 4
consisted of a root zone comprised of red clay with no apparent fabric. Beneath the root zone in Trench 4
was mostly diorite with few feldspar intrusions.
Trench 5 runs approximately 20 feet northwest of NS-29 perpendicular to trenches 3 and 4. The general
soil profile in Trench 5 is red-brown highly weathered saprolite from ground surface to approximately 3
feet bgs and a dense, gray-white, diorite saprolite below 3 feet bgs.
Features of potential interest were noted at the following locations:
• Approximately l2 feet into Trench 5, medium-grained black-white rock was encountered 6 feet
bgs. Feldspar intrusions were also observed in this area and blocks of diorite rock with similar
parent material to the red-brown clay were found suspended in the red-brown clay (Photo 15).
Following the rock is a saprolite consisting of granodiorite-like texture coarse-grained that is
50/50 white-black with a green-gray hue due to mafices.
• Quartz intrusions were observed between 30 and 40 feet into Trench 5. At 45 feet into Trench 5,
green-gray fine-grained saprolite striated by parallel feldspar intrusions was observed (Photo 16).
• Near the terminus of Trench 5 with Trenches 3 and 4 the trench was extended to 12 feet bgs and
no rock was encountered .. Quartz/feldspar intrusions into the white-black saprolite were observed
in the final lO feet of Trench 5.
Trench 6
Trench 6 was performed approximately 100 feet northeast of Trench 2, beginning in the center of the
swale proximate to monitoring well NS-26. The upper four feet of Trench 6 was a red-clay fill from the
beginning of the trench for approximately 40 feel. Below the fill material was a dense. fine-grained, dark
gray-black, sandy saprolitc with occasional white intrusions and faint foliation. Weathered rock was
encountered approximately 6 feet bgs. The rock is a black, fine-grained with faint foliation and irregular
fractures intruded with white feldspar/quartz.
Features of potential interest were noted at the following locations:
0793':!188
• Photo 17 shows a rock knob approximately 20 feet into Trench 6.
• Approximately 40 feet into Trench 6 the material from 0 to 4 feet bgs changed from the fill
material to a red-brown native clay and the material below (4 to 6 feet bgs) changes to a dense
gray and white coarse-grained saprolite.
• Between 50 and 75 feet into Trench 6, black-white saprolite with a very dense diorite type fabric
was observed hanging in the red-brown material (Photos 18 and 19).
• Approximately 80 feet into Trench 6 the saprolite material from 4 to 6 feet bgs changed to a dense
gray/white saprolite with a diorite fabric.
BLASLAND. BOUCK & LEE. INC.
onglnoers a scientists
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Mr. Jon Bomholm
March 13, 2003
Page 5 of 8
• Quartz/feldspar intrusions were observed in the saprolite material between 90 feet into and the
end of Trench 6 (Photo 20).
• At 115 feet into Trench 6 blocks of very dense gray/white diorite saprolite were found
approximately 5 feet bgs.
• In the final 10 feet of Trench 6, the red-brown saprolite found between ground surface and 2 feet
bgs thickened to 4 feet bgs.
Trench 6 terminated approximately 50 feet northwest of the access road._
Tre11ch 7
Trench 7 began approximately 70 feet southeast (across the access road) of the terminus of Trench 6. The
general soil profile at the beginning of Trench 7 consisted of 1-2 feet of red-brown saprolite in the root
zone and green-gray, medium-grained dense saprolite highly intruded with medium scale subvertical black
lineations giving a general marbled appearance (Photo 2 l).
Features of potential interest were noted at the following locations:
• The initial 50 feet of Trench 7 was this marbled appearing material with q~artz/feldspar
intrusions. A non-planar, black mineral intrusion with little quartz was observed approximately
45 feet into Trench-7 (Photo 22).
• At approximately 50 feet into Trench 7. the green-gray black:lincated saprolite material changed
into a medium-grained lighter overall material speckled with black. Few intrusions were
observed in this material. ·
• From approximately 75 to 95 feet into Trench 7, quartz intrusions were observed in the saprolite
(Photo 23).
• From 100 to 190 feet into Trench 7, dark gray, fine-grained saprolite intruded into pale green-gray
contact morphed rock. These areas were banded by gray-white medium to coarse-grained
saprolite randomly intruded by randomly oriented feldspar veins. Photos 24 and 25 show these
material interactions. This is area B identified on Figure 2.
• From l 90 to 205 feet into Trench 7 the frequent intrusions stop and the material is mainly the
gray-white saprolite.
• From 205 feet into Trench 7 to the tenninus of the trench, roots extend down to 6 feet bgs,
indicating a possible fill area.
Trench 8
Trench 8 was performed closer to the Trench Area than the other trenches. Photo 26 shows the location of
Trench 8 relative to the Trench Area. It was located in the cleared area near the Trench Are,a and began
approximately ISO feet south of monitoring wells NS-7 and NS-16. The general soil profile in Trench 8 is
a red-brown clay saprolite with trace rock fabric from ground surface to 3 feet bgs grading to a paler red-
brown to tan denser silt/sand speckled with black.
07932188
BLASLAND. BOUCK & LEE. INC.
engineers a sclanflsts
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Mr. Jon Bomholm
March 13, 2003
Page 6 of 8
Features of potential interest were noted at the following locations:
• .Few quartz intrusions were observed between. the beginning of Trench 8 and 40 feet into the
trench. Photo 27 shows one of the quartz intrusions.
• Approximately 40 feet into Trench 8, a I foot band of fine to medium gravel of black mafic rock
was observed approximately 2 feet bgs where the red-brown saprolite transitioned into the paler
saprolite. This layer pinches out from 55 to 70 feet into Trench 8 and then reappears.
• At 90 feet into Trench 8, the trench was dug to 12 feet bgs where a medium dense fine to
medium-grained saprolite little foliated with green/gray and tan silt was observed from 8 to 12
feet bgs.
• From 105 to 140 feet into Trench 8, the saprolite is intruded with feldspar and zones heavy with
ma fices.
• Another feldspar and mafices intrusioned zone was found between 175 feet into and the terminus
of Trench 8.
Trench 9
Trench 9 was performed approximately 150 feet to the northeast of monitoring well NS-21. This location
is in a line with the swale by EX-02 and NS-26 and the Trench Area. The general soil profile in Trench 9
is a red-brown clay root zone from ground surface to 3 feet bgs with a tan dense silt-sand composition
below 3 feet bgs.
Features of potential interest were noted at the following locations:
• Approximately 20 feet into Trench 9, a 6-inch zone comprised of quartz rocks of fine to coarse
gravel size was observed suspended in the red-brown clay (Photo 28). This quartz zone was
present from 20 to 85 feet into Trench 9, identified by Con Figure 2. This quartz zone was water
bearing in some areas.
• At 70 feet into Trench 9, the trench was dug to 14 feet bgs (Photo 29). At 12 feet bgs, moist
green-gray silt/fine sand was observed. After the quartz zone pinched out trace pieces of quartz
was observed in the red-brown clay from 115 to 130 feet into Trench 9.
• From 105 to the terminus of Trench 9 there was a general lack of intrusions. The trench was dug
deeper from 130 to 140 feet and 180 to 190 feet into Trench 9 and the moist green-gray silt/fine
sand was observed as at 70 feet into Trench 9.
Trench JO
Trench 10 was performed from EX-03 in the direction of EX-04. The general soil profile in Trench 10 is a
red-brown clay root zone from ground surface to 3 feet bgs grading to a dense tan silt/clay with little rock
fabric at depths greater than 3 feet bgs. Trench 10 was dug to 10 feet bgs 10 feet into the trench, a
gray/white fine sand saprolite fabric of fine-grained diorite was observed from 8 to 10 feet bgs. Photo 30
shows the general material found in Trench 10.
Features of potential interest were noted at the following locations:
079321118
BLASLAND, BOUCK & LEE, INC.
anglnaars & sc/antl.s(s
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Mr. Jon Bomholm
March 13, 2003
Page 7of 8
• Approximately 20 feet into Trench 10, tan-and-gray dense silt-clay saprolite with weathered
fractures was observed from three feet bgs.
• From 30 to 75 feet into Trench 10, this tan-and-gray saprolite is intruded with feldspar, zones with
high concentration of mafices as fine to coarse gravel and greenish-gray very fine-grained foliated
mafices.
• At 75 feet into Trench 10, the trench is dug to 11 feet bgs where harder rock was. encountered.
From 75 to 150 feet into Trench 10, tan-and-gray dense silt-clay saprolite existed with few
feldspar intrusions.
• Between 145 and 150 feet into Trench 10 the trench was again dug to harder rock, in this location
9 feet bgs.
• Between 150 and 185 feet into Trench 10, the tan-and-gray dense silt-clay saprolite was often
intruded with feldspar, quartz and fine-grained sand cross-hatched by fractures (Photo 31).
• From 185 to 225 feet into Trench 10, tan-and-gray dense silt-clay saprolite had few quartz
intrusions.
• At 230 feet into Trench 10 the trench was dug to 12 feet bgs with no hard rock encountered. An
area of many intrusions existed al approximately 230 feet into Trench 10 (Photo 32).
• Photo 33 shows the rock knob encountered at 265 feet into Trench 10. Photo 34 shows a sample
of the rock from the rock knob.
CONCLUSIONS
General conclusions based on the trenching activities include:
• More features were observed in areas where greater transmissivlty is inferred based on greater
well yield and elevated concentrations of VOCs;
• Features were observed coincident with topographic lineaments (e.g., natural drainage swa!es or
low-relief ridges); and,
• Saprolite indicated greater weathering in trenches located closer to the Unnamed Tributary than in
trenches located closer to _the Trench Area.
While individual intrusions and fractures were observed during the overburden trenching, the most interesting
and pertinent data from the trenching activity may be the general areas of fractures and intrusions that were
observed. These areas may be indicative of the fracture sets identified in the fracture trace analysis. Many of
these fractured areas are localed in the vicinity of the swale from the Unnamed Tributary along EX-02 and NS-
26.
FUTURE ACTIVITIES
Based on the results of the trenching and fracture mapping, monitoring wells will be installed in the location of
the identified fracture area. The locations of the two wells to be installed are shown on Figure 2. One well
07932188,
BLASLAND, BOUCK & LEE. INC.
anglnaars & scientists
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Mr. Jon Bornholm
March 13, 2003
Page 8 of 8
will be installed along Trench 7, approximately 400 feet northeast of monitoring well NS-29. The second well
will be installed near the Trench Area proximate to monitoring wells NS-7 and NS-16. A deeper well in this
location will provide information on vertical gradients and bedrock groundwater flow in the vicinity of the
Trench Area.
Packer testing will be performed in these wells as drilling occurs to identify productive fracture zones.
Groundwater collected from the fractures will be analyzed for 1,2-DCA on a rapid tum around so the
boreholes of the wells are not left open in the impacted zone. During the packer testing of the newly installed
monitoring wells, pressure transducers (trolls) will be installed in surrounding wells to obtain water level data
and collect information on the interconnectiveness of the newly installed monitoring wells to existing wells.
Well drilling and associated activities will take place in April 2003. At the conclusion of the m6nitoring well
installation and packer testing, a technical memorandum will be prepared discussing the results of the
installation and testing. Additional future activities will be proposed at that time.
We look forward to continuing our efforts to develop an appropriate remedy for OU I at the site.' If you have.
any questions regarding the information in this letter, please contact me at [phone] or mpf@bbl-
rnc.com.
Sincerely,
BLASLAND, BOUCK & LEE, INC. /')
~--
Michael P. Fleischner
Associate
CYD/hrl
Enclosure
cc: Angela Doh!, National Starch & Chemical Company
Richard Franklin, National Starch & Chemical Company
Catherine Dayton, Blasland, Bouck & Lee, Inc.
07932188
BLASLAND, BOUCK & LEE. INC.
engineers & sclanrlsts
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I FIGURES
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SOURCES:
ROWAN MILLS, CHINA GROVE,
NORTH CAROLINA
7.5 MINUTE QUADRANGLE
CONTOUR INTERVAL a 10 FEET
QUADRANGLE LOCATION
3/03/03 CRA·TLF
05007001/0500781 0.CDR
S'h"
* MN
98 M1LS Q.'...!L
•I MILS
UTM GRIO ANO l9t17 MAGNETIC NORTH
DECLINATION AT CENTER OF SHEET
2000' 0 2000'
Approximate Scale: 1" = 2000'
NATIONAL STARCH AND CHEMICAL COMPANY
CEDAR SPRINGS ROAD PLANT
SALISBURY, NORTH CAROLINA
TECHNICAL MEMORANDUM ON
OVERBURDEN TRENCHING
SITE LOCATION MAP
I
FIGURE BBL BLASLAND, BOUCK&_ LEE. I_NC. 1
engineers & scientists
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CEDAR
LEGEND:
e MONITORING WELL LOCATION
♦ EXTRACTION WELL LOCATION + PROPOSED MONITORING WELL LOCATION
A
B
C
D
E
F
-OBSERVATION TRENCH
IDENTIFIED FRAC1lJR[ TRACE
TRENCH FEATURES:
AREA OF QUARTZ INTRUSIONS
SEE PHOTOS 3, 6, 7
MEDIUM-GRAINED MASSIVE ROCK
SEE PHOTS 8-12
AREAS OF FELDSPAR & QUARTZ
INTRUSlONS IN EXTREMELY WEATHERED
DIORIT[ ROCK SEE PHOTOS 13-16
ROCK KNOB WITH INTRUSION, AREA
OF SHALLOW ROCK ( 4 FEET SGS)
SEE PHOTOS 17 & 18
AREAS OF HEAVY QUARTZ & FELDSPAR
INTRUSIONS AND CONTACT OF
DIFFERENT SAPROLITE MATERIALS
SEE PHOTOS 23-25
QUARTZ ZONE SUSPENDED IN
RED-BROWN CLAY ( 4 FEET BGS)
SEE PHOTO 29
SOURCES:
-MAP ENTITLED "SITE MAP' PREPARED FOR NATIONAL STARCH
AND CHEMICAL COMPANY BY INTERNATIONAL TECHNOLOGY
CORPORATION, KN0XV1LLE, TENN., DATED 5/18/93.
-MONITORING ¼'ELL SURVEY BY SCHULENBERGER SURVEYING
COMPANY, SALISBURY, N.C .. DATED 1/21/97
MONITORING WELL SURVEY BY TAYLOR WEISMAN & TAYLOR.
RALEIGH N.C., DATED 3/98
-OBSERVATION AND COLLECTION TRENCH AREAS TAKEN FROM
TAYLOR WISEMAN & TAYLOR ENGINEERING DRAWING TITLED:
"OBSERVATION TRENCH LOCATION MAP", SHEET 1/1,
PROJECT No. 70372.0003.00, DATED: 12/23/02.
,oo
GRAPHIC SCALE
NATIONAL STARCH AND CHEMICAL COMPANY
SPRING ROAD PLANT, SALISBURY, NORTH CAROLINA
TECHNICAL MEMORANDUM
ON OVERBURDEN TRENCHING
TRENCH LOCATIONS
BBI:
BLASLAND, BOUCK&. LEE, INC.
FIGURE
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-MAP ENTITLED "SITE MAP' PREPARED FOR NATIONAL STARCH
ANO CHEMICAL COMPANY SY INTERNATIONAL TECHNOLOGY
CORPORATION. KNOXV1LLE, TENN., DATED 5/18/93_
-MONITORING WELL SURVEY BY SCHULENBERGER SURVEYING
COMPANY, SALISBURY, N.C., DATED 1/21/97
-MONITORING WELL SURVEY BY TAYLOR WEISMAN & TAYLOR
RALEIGH N.C., DATED 3/98 ,
-OBSERVATION AND COLLECTION TRENCH AREAS TAKEN FROM
TAYLOR WISEMAN & TAYLOR ENGINEERING DRAWING TITLED·
HOBSERVATION TRENCH LOCATION MAPH, SHEET 1/1, .
PROJECT No. 70372.0003.00, DATED: 12/23/02.
0 240'
GRAPHIC SCALE
NATIONAL STARCH AND CHEMICAL COMPANY
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CEDAR SPRING ROAD PLANT, SALISBURY, NORTH CAROLINA
TECHNICAL MEMORANDUM
ON OVERBURDEN TRENCHING
VOLATILE ORGANIC COMPOUND
DETECTIONS IN GROUNDWATER
FOR OU1 OU2 WELLS
BBL FIGURE
BLASLAND, BOUCK & LEE, INC. 3
engin""" fl scl,.r,11,ts
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I PHOTOGRAPHS
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Photo 1 -An average trench of red-brown saprolite clay with natural fabric intact.
Photo 2 -Trench location after regrading and seeding.
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Photo 3 -1 inch trace present on both faces of trench approximately five feet into Trench I.
Photo 4 -Quartz intrusion observed approximately 127 feet into Trench 1.
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Photo 5 -Quar tz intrusion observed approximately 139 feet into T rench I.
Photo 6 -Gray-black fine-grained dike intrusion approximately 6 inches wide crossing Trench t
between 210 and 220 feet.
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Photo 7 -Irregular quartz veins observed in Trench 1 between 260 and 270 feet that line up poorly
with south face of trench. Moisture observed on trace.
Photo 8 -1 inch near vertical quartz intrusion on north wall approximately 285 feet into Trench 1.
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Photo 9 -Same location as Photo 8 facing south face of Trench I. Intrusive block of white-tan quartz
with red-brown saprolite above and below.
Photo 10 -Ultra mafic fine grained black rock, moderately strong intrusion on both faces
approximately 15 feet into Trench 2.
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Photo It -Rocks from area shown in Photo 10.
Photo 12 -Black-white medium to large grained mafic rock generally observed in Trench 2.
Generally planar fractures but no dominant orientation.
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Photo 13 -Rock samples from Trench 2.
Photo 14 -Feldspar intrusion offset by fault approximately 8 feet into Trench 3.
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Photo 15 -Rock sample from Trench 5.
Photo 16 -Diorite rocks suspended in red-brown clay of similar parent material observed
approximately 45 feet into Trench 5. Medium grained black and white diorite rock present beneath
clay.
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Photo 17 -Rock knob with intrusion observed 20 feet into Trench 6.
Photo 18 -Dense black/white diorite type text, shot by vertical white intrusion observed 50 feet into
Trench 6. Blocks in sidewall separated by red clay.
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Photo 19 -Black/white saprolite, very dense diorite type fabric hanging in red brown saprolite
observed approximately 50 feet into Trench 6, same parent material.
Photo 20 -Quartz/feldspar intrusion into dense gray/white saprolite approximately 100 feet into
Trench 6.
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:-El --: 7 --: s -:s ---E-...
Photo 21 -Green-gray, medium grained dense saprolite highly intruded with medium scale black
lineations and general marbled appearance in Trench 7. Weathered to red-brown.
Photo 22 -Black mineral intrusion with little quartz observed approximately 50 feet into Trench 7.
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Photo 23 -General material observed from 75 to 95 feet in Trench 7. Quartz intrusion separating
gray/white diorite type saprolite cross-hatched by parallel feldspar veins from green/gray fine
grained sandy saprolite infused by white veins.
Photo 24 -Contact of different saprolitic materials observed in Trench 7 between 100 and 190 feet.
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Photo 25 -Mafic fine-grained rock suspended in green-gray saprolite seen approximately 165 feet
into Trench 7.
Photo 26 -View of Trench 8 at approximately 200 feet. The Trench Area is visible in the background
on the right.
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Photo 27 -One of the few quartz intrusions present in Trench 8 (at approximately 35 feet).
Photo 28 -View of quartz zone suspended in red-brown clay present in Trench 9 from 20 to 85 feet.
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Photo 29 -View of green-gray silt located approximately 12 feet below ground surface
approximately 70 feet into Trench 9.
Photo 30 -General view of Trench 10.
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Photo 31 -Quartz intrusion in tan-grey saprolite observed approximately 170 feet into Trench 10.
Photo 32 -Area of many intrusions from 4 to 12 feet below ground surface approximately 230 feet
into Trench 10.
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Photo 33 -Rock knob observed at 265 feet into Trench 10.
Photo 34 -Rock sample from the rock knob observed in Trench 10.
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I ATTACHMENT 1
I TRENCHING FIELD NOTES
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•BBL • BIAS'.AllO. &OOCK & LEE. INC. erg1ne•11 ., JCiftn/1.,, .• SUBJEO
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ATTACHMENT 2
. CD CONTAINING PHOTOGRAPHS