HomeMy WebLinkAbout20090898.tiff • •
•
GEOTECHNICAL ENGINEERING REPORT
SAND AND GRAVEL STUDY
NORTHWEST OF WELD COUNTY ROADS 58 &51
WELD COUNTY, COLORADO
Terracon Project No. 21085006
March 12, 2008
• Prepared for:
PLUMB RIDGE, LLC
14399 Weld County Road 74
Eaton, Colorado 80615
Prepared by:
Terracon Consultants, Inc.
1289 1st Avenue
Greeley, Colorado 80631
Phone: 970-351-0460
Fax: 970-353-8639
•
lierracon
2009-0898
• March 12, 2008 llerracon
Consulting Engineers&Scientists
1289 First Avenue
Greeley,Colorado 80631
Plumb Ridge, LLC Phone 970.351.0460
.353.8639
14399 Weld County Road 74 Fax.ter acon.com
ww�v.terracon.com
Eaton, Colorado 80615
Attn: Mr. Todd Bean
Re: Geotechnical Engineering Report
Sand and Gravel Study
Northwest of Weld County Roads 58 &51
Weld County, Colorado
Terracon Project No.21085006
Terracon has completed geotechnical engineering exploration for the proposed sand and gravel
pit northwest of Weld County Roads 58 and 51 in Weld County, Colorado. This study was
performed in general accordance with our proposal number P210070839 dated February 6,
2008.
The results of our engineering study are attached. These results include the Boring Location
• Diagram, Logs of Boring, and laboratory test results.
We appreciate being of service to you in the geotechnical engineering phase of this project, and
are prepared to assist you during the construction phases as well. Please do not hesitate to
contact us if you have any questions concerning this report or any of our testing, inspection,
design and consulting services.
°°uNf^'s�o'tt
Sincerely, ::"c•
_d4 4tf
TERRACON CONSULTANTS, INC. 't
z its
6 lrefi
t '(I 1 �1�
Jason Mapes, El. aymon• L. Dent• ' •
Project Engineer Geotechnical Department Manager
Reviewed by:
Ed Paas, P.E.
Geotechnical Engineer
Copies to: Addressee (3)
•
Delivering Success for Clients and Employees Since 1965
More Than 95 Offices Nationwide
• •
Geotechnical Engineering Report Terracon
Sand and Gravel Study
• Terracon Project No.21085006
TABLE OF CONTENTS
Page No.
Letter of Transmittal
INTRODUCTION 1
SITE EXPLORATION 1
Field Exploration 1
Laboratory Testing 2
SITE CONDITIONS 2
Economic Mineral Potential 2
Soil Conditions 3
Field and Laboratory Test Results 3
Groundwater Conditions 3
Sand/Gravel Mining Considerations 4
GENERAL COMMENTS 4
BORING LOCATION DIAGRAM Figure No. 1
• APPENDIX A: LOGS OF BORINGS
APPENDIX B: LABORATORY TEST RESULTS
APPENDIX C: GENERAL NOTES
•
ii
• •
• GEOTECHNICAL ENGINEERING REPORT
SAND AND GRAVEL STUDY
NORTHWEST OF WELD COUNTY ROADS 58 &51
WELD COUNTY,COLORADO
Terracon Project No.21085006
March 12, 2008
INTRODUCTION
This report contains the results of our geotechnical engineering exploration for the proposed
sand and gravel pit to be located northwest of Weld County Roads 58 and 51 in Weld County,
Colorado.
The purpose of these services is to provide information and recommendations relative to:
• subsurface soil and bedrock conditions.
• groundwater conditions.
• feasibility of site for use as a sand and/or gravel mine.
• The recommendations contained in this report are based upon the results of field and laboratory
testing, engineering analyses, our experience with similar soil conditions, and our understanding
of the proposed project.
PROJECT INFORMATION
Based on information provided by the client, the approximately 100-acre site is being
considered for development as a sand and gravel mining operation pit.
SITE EXPLORATION PROCEDURES
The scope of the services performed for this project included site reconnaissance by a
geotechnical engineer, a subsurface exploration program, laboratory testing and reporting.
Field Exploration: A total of 4 test borings were drilled on February 21, 2008 to depths of
about 50 feet below existing site grade at the approximate locations shown on the Boring
Location Diagram, Figure 1. The borings were advanced with a truck-mounted air percussion
drilling rig, utilizing 6-inch inside diameter flight auger.
The borings were located in the field with assistance from the client. The accuracy of boring
locations should only be assumed to the level implied by the methods used.
•
Geotechnical Engineering Report Terracon
Sand and Gravel Study
Terracon Project No. 21085006
• Lithologic logs of each boring were recorded by the geotechnical engineer during the drilling
operations. At selected intervals, samples of the subsurface materials were obtained by
collecting bulk samples of material through the cutting funnel.
Groundwater measurements were made in each boring at the time of site exploration. All
borings were filled after drilling operations due to safety considerations for livestock on site.
Minor boring settlement should be expected, some maintenance should be anticipated.
Laboratory Testing: Samples retrieved during the field exploration were returned to the
laboratory for observation by the project geotechnical engineer, and were classified in general
accordance with the Unified Soil Classification System described in Appendix C. At that time,
an applicable laboratory-testing program was formulated to determine physical properties of the
subsurface materials. Following the completion of the laboratory testing, the field descriptions
were confirmed or modified as necessary, and Logs of Borings were prepared. These logs are
presented in Appendix A.
Laboratory test results are presented in Appendix B. Laboratory tests were performed in
general accordance with the applicable local or other accepted standards.
SITE CONDITIONS
• The approximately 100-acre site is' currently used primarily for pasture and agricultural
purposes. The site was bounded on the north by the Cache La Poudre River, on the east by
Weld County Road 51, on the south by Weld County Road 58, and on the west by hilly terrain
with sparse residential/agricultural development. The ground surface was generally flat to
gently rolling. Vegetation consisted of grasses and native weed growth.
Geology: Surficial geologic conditions at the site, as mapped by the U.S. Geological Survey
(USGS) ('Tweeto, 1979), consist of Post Piney Creek Alluvium of Upper Holocene Age. This
material generally consists of dark gray humic, sandy to gravelly alluvium. These materials, as
mapped in this area, are generally on the order of about 20 feet in thickness.
Economic Mineral Potential: Mapping performed by the USGS (2Schwochow, Shroba, and
Wicklein, 1974) indicates that the site lies in an area of flood-plain and valley fill deposits along
'Tweeto,Ogden., 1979,Geologic Map of Colorado,United States Geological Survey, Map 1-855-G.
'Schwochow, S.D., Shroba, R.R., and Wicklein, P.C., 1974, Sand, Gravel, and Quarry Aggregate Resources of the
• Colorado Front Range Counties,Colorado Geological Survey, Special Publication 5-A,Plate 1.
2
Geotechnical Engineering Report Terracon
Sand and Gravel Study
Terracon Project No.21085006
• present stream courses with stream deposits consisting of coarse and fine aggregate resources.
This is consistent with the materials encountered in our borings.
Mapping performed by the USGS (3Trimble and Fitch, 1974) adjacent to the project site
indicates that the site likely contains a gravel deposit underlying flood plains and terraces. The
materials are described as pebbles and dasts generally well rounded, unweathered, and
contain little deleterious "lime" (CaCO3). Clasts are composed chiefly of quartzite, granite,
gneiss, and pegmatite. The material contains few or no reactive constituents and is a source of
quality gravel for concrete and aggregate and road metal. Thicknesses of the deposits mapped
close to the area range from approximately 16 to 28 feet in thickness. Based on the materials
encountered in our borings, it is likely that commercially extractable mineral deposits are located
on the project site.
Due to the relatively flat nature of the site, geologic hazards at the site are anticipated to be low.
Seismic activity in the area is anticipated to be low, and the property should be relatively stable
from a structural standpoint. With proper site grading around the proposed mine, erosional
problems at the site should be reduced.
Soil Conditions: As presented on the Logs of Boring, surface soils consisted of about 6 inches
of topsoil and about 3 feet of clayey sand. The overburden materials underlying the surface
• soils and extending to depths of 50 to 57 feet consisted of cobbles, gravel, and sand with
varying amounts of silt and clay.
Field and Laboratory Test Results: The classifications included in Appendix B indicate the
overburden materials generally classify as gravels and sands with varying amounts of silt.
These classifications were performed on the bulk samples which were returned in the cutting
funnel during drilling activities.
Gravels encountered ranged from %-inch diameter to 4-inch diameter. Percentages of size
distribution are presented in the laboratory test results in Appendix B.
Groundwater Conditions: Groundwater was encountered at depths of about 4 to 8 feet below
existing site grade in the test borings at the time of field exploration. These observations
represent groundwater conditions at the time of the field exploration, and may not be indicative
'Trimble, Donald E, and Fitch, Harold R., 1974, Map Showing Potential Sources of Gravel and Crushed Rock
Aggregate In the Boulder-Fort Collins-Greeley Area, Front Range Urban Corridor, Colorado, United States Geological
• Survey,Map l-855-D.
3
Geotechnical Engineering Report Terracon
Sand and Gravel Study
• Terracon Project No.21085006
of other times or at other locations. Groundwater levels can be expected to fluctuate with
varying seasonal and weather conditions.
Based upon review of U.S. Geological Survey Maps, (°Hillier, et al, 1979), regional groundwater
beneath the project area is expected to be encountered in unconsolidated alluvial deposits on
the site at depths ranging from 5 to 10 feet below present ground surface.
Sand/Gravel Mining Considerations: Based upon the materials encountered during the
geotechnical exploration of the site and the results of the laboratory testing, the site appears to
be feasible for the purpose of mining significant quantities of gravel sized or larger aggregate.
The depth of these materials ranges from approximately 3 to 57 feet below existing site grade.
The depth of groundwater encountered indicates that the extraction of the majority of this
material will require dewatering operations. Methods for dewatering could consist of installing
isolated well points or placing a slurry wall system around the proposed mining area. We
recommend that the owners consult with an experienced sand/gravel mining company to further
asses the economic and physical viability of using the site for mining.
GENERAL COMMENTS
This report should not be relied upon for final design, and should only be used for planning and
• budget purposes.
The analysis and recommendations presented in this report are based upon the data obtained
from the borings performed at the indicated locations and from other information discussed in
this report. This report does not reflect variations that may occur between borings, across the
site, or due to the modifying effects of weather. The nature and extent of such variations may
not become evident until during or after construction. If variations appear, we should be
immediately notified so that further evaluation and supplemental recommendations can be
provided.
The scope of services for this project does not include, either specifically or by implication, any
environmental or biological (e.g., mold, fungi, bacteria) assessment of the site or identification or
prevention of pollutants, hazardous materials or conditions. If the owner is concerned about the
potential for such contamination or pollution, other studies should be undertaken.
1Hillier, Donald E.; and Schneider, Paul A., Jr., 1979, Depth to Water Table (1976-1977) In the Boulder-Fort Collins-
1111 Greeley Area,Front Range Urban Corridor, Colorado, United States Geological Survey, Map I-855-1.
4
• •
Geotechnical Engineering Report Terracon
Sand and Gravel Study
• Terracon Project No.21085006
This report has been prepared for the exclusive use of our client for specific application to the
project discussed and has been prepared In accordance with generally accepted geotechnical
engineering practices. No warranties, either express or implied, are intended or made. Site
safety, excavation support, and dewatering requirements are the responsibility of others. In the
event that changes are planned in the nature, design, or location of the project as outlined in
this report, the conclusions and recommendations contained in this report shall not be
considered valid unless Terracon reviews the changes, and either verifies or modifies the
conclusions of this report in writing.
•
•
5
• • 1
S
B-1
B24
b
B-3
• B-4
WCR58
LEGEND FIGURE I: BORING LOCATION DIAGRAM
TODD BEAN GRAVEL STUDY
ejl TEST BORINGS NORTHWEST OF WELD COUNTY ROADS 58 & 51
WELD COUNTY, COLORADO
Project 1Yp:JRR Project Na 21085006
Designed 6r lrerracon
Walt Drawing lased on information gatdertd during site via Checked 1269 FIRST AVENUE Doke 3/4/0B
NOT INTENDED FOR CONSTRUCTION Mewed By. RID GREELEY.Caunno0 60631 Drawn By: JRN
He
Name: 21065006.Aag Figan No. I
LOG OF BORING NO. 1 Page 1 of 1
CLIENT
III Plumb Ridge,LLC
SITE Weld County Roads 58&51 PROJECT
Weld County,Colorado Todd Bean Gravel Study
SAMPLES TESTS
o
O t 0
2U DESCRIPTION >- w c F iF
I = N m o WF g OZ
a 0 O
o o S3 z m 3S oa OW
7 u.o \TOPSOIL-6 inches _
7473 CLAYEY SAND
light brown 5_SP 1 GRAS
POORLY GRADED SAND with GRAVEL _
maximum gravel diameter-1 1/2" -
10 --SP 2 GRAB
15 =SP 3 GRAS
77
\LEAN CLAY _
dark brown
: 1 WELL GRADED GRAVEL with SAND 20 ='G1^r 4 GRA3
i
rS i maximum gravel diameter-2 1/2" —
•11.:•4 25 6141 5 GRAB
Oil
• 64.4
••j 30 =GW 6 GRAB
L• ii
:�-a 35 ,GW 7 GRAB -
WELL GRADED SAND with GRAVEL -
maximum gravel diameter-1" -
40 SSW 8 GRA3
42 —
'"t.. POORLY GRADED GRAVEL with SAND
• < maximum gravel diameter-2 1/2" a5 _do g � •
a Cal
POORLY GRADED SAND
so ,,:-SP 10G,RA3
__54>i C POORLY GRADED GRAVEL with SAND 55 _
"°DA<57 maximum gravel diameter-3 1/2"
€ END OF BORING
i
u The stratification lines represent the approximate boundary lines
ibetween soil and rock types: in-situ,the transition may be gradual.
WATER LEVEL OBSERVATIONS,ft BORING STARTED 2-21-08
8 WL 4 5 WD I BORING COMPLETED 2-21-08 di• 0 LOGGED JRM OBE 21085006
WL z%1Ierracon AP-1000
FOREMAN JSD
LOG OF BORING NO. 2 Page 1 of 1
CLIENT
• Plumb Ridge, LLC
SITE Weld County Roads 58&51 PROJECT
Weld County,Colorado Todd Bean Gravel Study
SAMPLES TESTS
a c " S n
o DESCRIPTION rc F F i s
U N W W Z - Zit
a y m W O F2 >- OW<K
O 0 COD D LT Y K m 'CO3 O t 0
0lam!3 o CLAYEY hey c
,light brown if
POORLY GRADED SAND with GRAVEL 5
maximum gravel diameter-3/4" Q
10 SP 1 GRAS
4 12
Pi., WELL GRADED GRAVEL with SAND
I.1 maximum gravel diameter-1 1/2" 15 w 2 GRO 3
r4.11
;•j 20 W 3 GRAB
sss 22
POORLY GRADED GRAVEL with SAND
ob< maximum gravel diameter-2 1/2" 25 np A Can
>OC
• L oc
>C 3C 30
.30
pC 35 CP-4-GRA3
.37
'w li WELL GRADED GRAVEL with SAND
�•% maximum gravel diameter-2" 40 W 7 GRAB
PO 142
3O L POORLY GRADED SAND with GRAVEL
t.
v�D< maximum gravel diameter- 1 1/2" 45 SP 8 GRAB
)0C
$ 50 50 9 GRAB
END OF BORING
0
a
z
z
0
u
i
rc
lE
r
0 The stratification lines represent the approximate boundary lines
between soi and rock types: in-situ,the transition may be gradual.
WATER LEVEL OBSERVATIONS, ft BORING STARTED 2-21-08
a WL s g WD I BORING COMPLETED 2-21-08
= WL Y i lbrracon
RIG AP-1000 FOREMAN JSD
AWL LOGGED JRM JOB# 21085008
LOG OF BORING NO. 3 Page 1 of 1
CLIENT
• Plumb Ridge, LLC
SITE Weld County Roads 58 8 51 PROJECT
WeldCounty,Colorado Todd Bean Gravel Study
SAMPLES TESTS
DESCRIPTION r z in
z W Z Zz
C = CO co J KW ZZ
y W
O O D Z r K m ``U VI 3 N
T� OP$OIL-6 inches �'—
.- r 3 CLAYEY SAND —
light brown =_
WELL GRADED SAND S[ 5—
occasional gravel —
10 _S'M11 1 GRA3
.•.•. 15• 15 :SNP 2 GPA.J
POORLY GRADED SAND with GRAVEL
maximum gravel diameter- 1 1/7' -
20 -\SP 3 GRAB
22 -
)"t_ POORLY GRADED GRAVEL with SAND -
o�• < maximum gravel diameter-3" 25 -np 4 GRAS
• pC =
HOC 30 --r,P 5GRA.3
50 0 _
O
�C 35 _:-GP 6 GRAB
0 u -
OC =
�pc 40 ^GP 7 GRAB
r1C42 —
V POORLY GRADED GRAVEL with SAND _
��< maximum gravel diameter-2" 45 =GP 8 GRAB
OC -
$a 50 - 50 —GP 9GRA3
END OF BORING
0
O
0
u
fk The stratification lines represent the approximate boundary lines
between soil and rock types: in-situ,the transition may be gradual.
WATER LEVEL OBSERVATIONS,ft BORING STARTED 2-21-08
m WL - 5.5 WD I BORING COMPLETED 2-21-08
oWL s t .lierracon RIG AP-1000 FOREMAN JSD
WL LOGGED JRMJ JOB# 21085006
,
LOG OF BORING NO. 4 Page 1 of 1
CLIENT
•
Plumb Ridge,LLC
SITE Weld County Roads 58 S 51 PROJECT
Weld County, Colorado Todd Bean Gravel Study
SAMPLES TESTS
rr on
v DESCRIPTION o: ¢ c .z S L~
c O
1 h m m W O $co 0 W!W- -' Ow
KQ }} Q F-2 > U
<9 0 D Z i- K m 7iU ❑n =O
6 inches /
j3 CLAYEY SAND
▪ ,light brown tF
▪ WELL GRADED SAND with GRAVEL 5=
▪ maximum gravel diameter-1" -
to —-SW 1 GRAS
: 12
POORLY GRADED GRAVEL with SAND —_
o�< maximum gravel diameter-2" 15 =GP 2 CRAB —
)0 C -
a v"C -
to 0
p C 20 _GP 3 GRAS
,C2C
ci
�" 25 _GP 4 GRAt3
0 Lb<
oC
ono< 30 -GP 5 GRAS
QC -
))0• 0< 35 _-GP 6 GRA3
,r3C
>OC 40 JGP 7 GRA3
jM42 —
POORLY GRADED SAND with GRAVEL
maximum gravel diameter-2 12" a5 — SP S GR43
50 50 --SP P GRAB
END OF BORING
1
0
z
z
0
1
u The stratification lines represent the approximate boundary lines
between soil and rode types: in-siiu,the transition may be gradual.
WATER LEVEL OBSERVATIONS,ft BORING STARTED 2-21-08
g WL 8 q WD BORING COMPLETED 2-21-08
• i WL Y Y lfe«c7COn RIG AP-1000 FOREMAN JSD
o WL LOGGED JRM JOB# 21085006
. • •
U.S.SIEVE OPENING IN INCHES I U.S.SIEVE NUMBERS I HYDROMETER
6 4 ' 2 1.5 i 3/4 irz3/8 3 4 6 100 ..
100 I I 11 I I I 1 1 I f
• 95 .
90
II\ \ •
65
80
75
70 -
65 \ \I I ' _ .
I
60
} 55
m 1
Z50
it
1- 45
Z
W a
zo 40
UI O
a 35
30
25 t\.,)4iiii t .
20 =
• 15
10
k „
0 _
100 10 1 0.1 0.01 0.001
GRAIN SIZE IN MILLIMETERS
S
COBBLES wars R�VE fine coarse I medSmND I fine SILT OR CLAY
Specimen Identification Classification LL PL PI Cc Cu
• 1 4.0ft POORLY GRADED SAND with GRAVEL(SP) NP NP NP 0.86 8.75
CO 1 19.0ft WELL-GRADED GRAVEL with SAND(GW) NP NP NP 2.15 40.40
• 1 44.0ft POORLY GRADED GRAVEL with SAND(GP) NP NP NP 0.65 61.12
* 2 19.0ft WELL-GRADED GRAVEL with SAND(GW) NP NP NP 1.12 7.50
s 0 2 24.0ft POORLY GRADED GRAVEL with SAND(GP) NP NP NP 4.57 69.79
A Specimen Identification D100 D60 D30 D10 %Gravel %Sand %Silt 1 %Clay
• 1 4.0ft 50.8 6.688 1.774 0.65 44A 54.6 1.0
8 m 1 19.0ft 50.8 23.172 5.341 0.574 71.6 26.4 2.1
• 1 44.0ft 76.2 41.88 4.32 0.685 67.9 30.6 _ 0.2 __
r * 2 19.0ft 50.8 13.67 5.294 . 1.823 73.3 26.5 0.2
g o 2It _ 24.0ft 63.5 42.432 10.854 0.608 75.9 23.9 0.2
8 GRAIN SIZE DISTRIBUTION
• w Project: Todd Bean Gravel Study
llerr.acon
Site: Weld County Roads 58&51 Weld County, Colorado
1.2 Job#: 21085006
O Date: 2-29-0S
• •
U.S.SIEVE OPENING IN INCHES I U.S.SIEVE NUMBERS I HYDROMETER
6 4 2 1.5 1 3/4 1/23/5 3 4 6 100140506000
100 I II I I : I I I I I I I I
• 45
90
85
80
75
: 1-----.1\
•
70 -
▪ 65 -
x •
Ln 60
w •
•
M
• 55
rc
z 50 -
t-▪ 45
2
w
• 40
w
a
35 - \30 -
25 -
20 \\I
• 15 - -
10 . _ _ . - .
5 •
•
100 10 1 0.1 0.01 0.001
GRPJN SIZE IN MILLIMETERS
COBBLES coarseGR�VE fine coarse I medium N fine SILT OR CLAY
Specimen Identification Classification LL PL PI Cc Cu
• 2 39.0ft WELL-GRADED GRAVEL with SAND(GW) NP NP NP 1.00 11.15
m 3 19.0ft POORLY GRADED SAND with GRAVEL(SP) NP NP NP 0.87 5.64
• 3 34.0ft POORLY GRADED GRAVEL with SAND(GP) NP NP NP 3.15 37.34
* 3 49.0ft POORLY GRADED GRAVEL with SAND(GP) NP NP NP 0.38 19.70
0 4 19.0ft POORLY GRADED GRAVEL with SAND(GP) • NP NP NP 0.76 64.37
Specimen Identification D100 boo D30 D10 %Gravel %Sand %Silt I %Clay
• 2 39.0ft 63.5 24.033 7.202 2.156 79.2 20.4 0.4
g I 3 19.0ft 50.8 2.292 0.902 0.406 28.2 71.3 0.5
1 • 3 34.0ft 76.2 65.76 19.088 1.761 78.4 17.2 0.1
* 3 49.0ft 63.5 13.416 1.865 0.681 51.1 48.3 0.7
a
8 0 4 19.0ft 63.5 28.694 3.125 0.446 66.3 33.3 0.4
-
1 GRAIN SIZE DISTRIBUTION
• N 1lerracon Project: Todd Bean Gravel Study
Site: Weld County Roads 58&51 Weld County, Colorado
$ Job#: 21085006
F Date: 2-29-08
• •
U.S.SIEVE OPENING IN INCHES I U.S.SIEVE NUMBERS I HYDROMETER
B 4 33...� 2 1.5 1 3/9123/8 3 4 B 100
100 I 'RIw I I III 1 I 1 1 1 I I I :
• 95
90
85 •
80
•
75
70 .
r-
65 - - .
1\\ \
2 60
> 55
-\\\\\:" .
m
ur50
z
it
z45
w
E 4
a
35
30
25
•
20 i
• 15
10
5
0,
100 10 1 0.1 0.01 0.001
GRAIN SIZE IN MILLIMETERS
COBBLES GRAVEL SAND SILT OR CLAY
coarse I fine coarse medium I tine
Specimen Identification Classification - LL PL PI Cc Cu
• 4 29.oft POORLY GRADED GRAVEL with SAND(GP) NP NP NP 0.59 25.70
CID 4 44.0ft POORLY GRADED SAND with GRAVEL(SP) NP NP NP 0.91 6.78
Specimen Identification D100 060 D30 D10 %Gravel %Sand %Silt %Clay
a • 4 29.0ft 63.5 18.876 2.859 0.734 59.6 39.9 0.5 ___
g m 4 44.0ft 76.2 4.769 1.759 0.706 39.8 58.5 1.3
1
a
,-
I GRAIN SIZE DISTRIBUTION
• kl Project Todd Bean Gravel Study
= 1 I�rr�con Site: Weld County Roads 58&51 Weld County, Colorado
o Job#: 21085006
0 Date: 2-29-08
• •
• GENERAL NOTES
DRIW NG 8 SAMPLING SYMBOLS:
SS: Spit Spoon-1 a18"I.D.,2"O.D.,unless otherwise noted HS: Haw Stem Auger
ST: TN i-Walled Tube-$O.D.,unless otherwise noted PA: Power Auger
RS: Ring Sampler-2.4T I.D.,3"0.0.,unless Otherwise noted HA: Hand Auger
DB: Diamond Bit Coring-4',N,B RB: Rock Bit
BS: Bulk Sample or Auger Sample WB: Wash Boring or Mud Rotary
The number of blows required to advance a standard 2-Inch O.D. spirt-spoon sampler(SS)the fast 12 Inches of the total 18-inch
penetration with a 140-pound hammer falling 30 inches Is considered the'Standard Penetration'or'N-value".
WATER LEVEL MEASUREMENT SYMBOLS:
WL: Water Level WS: Whie Sampling WE: Not Encountered
WCI: Wei Cave in WD: Whie Drilling
DCI: Dry,Cave in BCR: Before Casing Removal
AB: After Boring ACR: After Casing Removal
Water levels dicated on the boring legs are the levels measured in the borings at the times indicated. Groundwater levels at other
Tones end other locations across the site could vary. In pervious soils,the Indicated levels may reflect:the location of groundwater. In
low permeability soils,the accurate determination of groundwater levels may not be possible with only slut-term observations.
DESCRIPTIVE SOIL CLASSIFICATION:Soil dassificafton is based on the Unified Classification System.Coarse Grained Soils have
more than 50%of their dry weigh)retained on a#200 sieve; their principal desaiptora are:boulders, cobbles, gravel or sand. Fine
Grained Soils have less than 50% of their dry weIght retained on a#200 sieve;they are principally described as clays if they are
plastic,and ails If they are slightly plasfic or non-plastic. Major constituents may be added as modifiers and minor conattuents may be
added according to the relative proportions based on grain size. In addition to gradation,coarse-grained soils are defined on the basis
of their in-place relative density and fine-grained sots on the basis of their consistency.
• CONSISTENCY OF FINE-GRAINED SOILS RELATIVE DENSITY OF COARSE-GRAINED SOILS
Standard
Unconfined Penetration or Standard Penetration
Compressive N-value(BSI or N-value ISSI
5trena h.Qu,pat Blows/Ft, Conslstencv Blows/Ft, Relative Density
<500 <2 - Very Soft 0-3 Very Loose
500 — 1,000 2.3 Soft 4-9 Loose
1,001 - 2,000 4-8 Medium Stiff 10-29 Medium Dense
2,001 - 4,000 7-12 Stiff 30-49 Dense
4,001 - 8,000 13-26 Very Stiff 50+ Very Dense
8,000+ 26+ Hard
RELATIVE PROPORTIONS OF SAND AND GRAVEL GRAIN SIZE TERMINOLOGY
Descriptive Tennis)of other Percen of 'Valor Component
constituents Iry Weight of Sample Particle Size
Trace <15 Boulders Over 12 in.(300mm)
With 15—29 Cobbles 121n.to 3 In.(300mm to 75 rear)
Modifier >30 Gravel 3 in.to#4 sieve(75mm to 4.75 mm)
Sand #4 to W200 slave(4.75mm to 0.075mm)
RELATIVE PROPORTIONS OF FINES Silt or Clay Passing#200 Sieve(0.075mm)
Descriptive Tennis)of other Percent of PLASTICITY DESCRIPTION
constituents Dry Weight
Toren Plasticity Index
Trace <5 Non-plastic 0
With 5-12 Low 1-10
Modifiers >12 Medium 11-30
High 30+
llerracon-_
--r--- ----------<-
-'--'_"-!JT_MW4,
• 44.11-MW3I I
QJT-B71z;.----_,„,,..;;;;;;;;; " . is
Q JT-B8, /- ; _ I
_ — -- --YJT-gs Q Ii,.
i
w
i
4 ti I I
A' JT-B.5
i�ter- - —•\ r
JT-MVN21 6 I
\ I \ JT-M1N51�'
is „
nI
' \\ JT-B3 I
�� Q / \ JT 82 l•.,' , T 4 I
ict
I<
I JT-MW11
I.
co ' X. JT-B1I
m \Q
o
o II
s
oa
11 LEGEND:
a Ji-MW5 ^°° zoo o aoo
Q = PIEZOMETER LOCATION m._ �
,e JT-B1 Q = BORE LOCATION grid r IN FEET
0 Date: 11/22/08
MI
t V JET Consulting, Inc. Journey Ventures, LLC Job No: 07113
• Journey Ventures Pit Drawn: WSS
1400 W 122nd Avenue-Suite 120 o Weshnineter,CO 80234 Boring Location Map Scale: 1"=400'
a 303-057-0735 Sheet: 1 Of: 1
• • • .
JT•BI JT-B2 JT-83 JT-B4 JT-85
—0 Bulk c1,1 , Bulkr:::.-l-7 Bulk 1'::"!s stoic _ p�.
2.20' t►• 3'_20• »PI- . 3'-30' F474— 3'-30' :~7- 3'-30' �('1
�p 0. �.t.•
.�. ..f:
Oil
•
Bulk '1i Bulk • 4�1 ,e :.� .v
20-Er ' 20'-63' t�:• iii; .`i~ :IBC;
—25 ,4�, :r :1 .' 25-
:'Y'� .«1 Bulk �_ >j l Bulk ___�' Bulk .�t_i
•
'fie 30'-833' I eN 30'-53' .p.1 30'-58' __Ow).
"'
r •
',..6,1
1 Iro
ri
cL 41•41 Bit*
55'
e 'er
s:1
`•
75 ij 75
—..x
'Ci: 100--
.
. : SARE CLINT J 8 T Consult4ig Inc ![DATF 1115!2008
is
PROJECT Kersey Gravel Investigaticr. i'JOB NO DC8 038
‘lrrn0r! .•n!1•n�.teerur;;r urr>rrbern. --!!--
DE
SCR'PTION Logs of Test Ho!es gi EIGuRE 1
• • i
JT-B6 JT-87 JT•B8 JT-MW1 JT•MW2
-0 Bulk Bulk :. '• Bulk T• �• Bulk• -ti Bulk +`' 0�
2.30. yY:� — .t;/ .e:
•. • 2'-20' �s 3'-20' 5'-62' "r'y!`2 _ • 0'-25' a-4
.� .0N,s. 4.4 '�i� & �F. 4.
�� 41 'yam;t • • C-67' ,.i•r-. 1.
d Bulk z l Bulk _ _•`� a4• • �.
`5 ;s i 20'-40 r 2C' 4C' .4y r.fe" Bulk �'
1.•
�` �Sd ..t • � �� 25
Bulk -rte: ,••, +�r. 25'-6T 4.4
Bulk '`'`
s c-• , r . OP AI.,
vI • I.
z; 40'$t' ��;+ 40 75' ;i X6:1 I r��., I
13
50 r s r.• '`' i• s4,.: 50—
u Bulk lr•4 "i!.1 ;'� •�` `, `: , r
0 O 58. I'•:... B:;Ik , ` 3.
I. V 68' 1f.. . £•! ., ` !
—75 •N -5
11 r•
~!y'
: Ci*:
-1JC
r;
•• • •
10%' •
C•�, ii.r
w■•Uu a r.
■r'w■�
wE wr.a■
•
. � yr'
i•�iii.i `= SARE
+�� CLIENT J 6 T Consulting Inc. —__ — DATE 11/5/2008
r:y „C , J08 NO 008 038
PROJECT Kersey Gravel InvtrSilgatior
fie nterbteia•el 1.minwerrn;t• ill/MN -- --- — _�—
DE:SCkI?TsON Logs of Test Holes i FIC.NF 2
• ! I
JT-MVV3 JT•MW4 JT-MW5
'-0 y:..:v p" p Bulk \•' Bulk i:'='•? . 0--,
Bulk 3'-20' 'J'•; ; 2' 20' '� - i;
7.20• .:;SI '! i? . . v ' �.
�: M
Bulkrtd Bulk Bulk 1 I. _
20'-40' Li..
11 .I • , F:. 25
: I� ;raj ,•,
: .`o • `"
Bulk _`
t Bulgy }� .- .. '•:' —
40'•6C' ;ti' 40'57' ';•.1 Hs +=C '="
i .•• - o
'o f �L` �;= C, ;.t... 50--- s
o .._ Bulk _-It Buk `! i
Bulk O 55'
60'75' • •• a 53,
•
•$•,
3
—75 i•, 75
kf• r�
:•:a
• :•1
I I';y
•
I -
• : SARE
CLIENT J 8 T Consulting Inc. DATF 1115/2008
PROJ[C' Kersey Gravel Investigation l JOB NO O08 038
r;,•alrc•buic al EirArnrrrvrrg C,grsnfNrt. - .------ ----_ --___ .._..__. __ ,_._.r- _ .. . -
'DESCRIPTION Logs O'Test Holes t?(IRE
• •
KEY TO SYMBOLS
Symbol Description Symbol Description
sI
Strata symbols slotted pipe w/ sand
TOPSOIL, (Silt), clayey. sandy, moist,
dark brown no pipe. filler material
SAND, gravely, clayey, moist to wet, •!
-'y brown to dark brown.
•*; SAND, gravely. WI clay. wet. brown to tan
Ii
E _ SHALE, with sand to sandy. moist to wet, li
light brown to grey
SANDSTONE, clayey, wet, rust brown to f'
grey to tan
Misc. Symbols
Water table during
= g
drilling
Monitor Well Details
capped riser with locking cover
• .Z assorted cuttings
%.
= bentonite pellets
silica sand, blank PVC
Notes:
1. Exploratory borings were drilled using a 6-inch diameter hollow stem continuous flight auger and a 4-inch
solid stem continuous flight auger powered by a CME-75 drill rig operated by Drilling Engineering of Fort
Collins.
2. Groundwater was observed in all holes at the time of drilling. Observed groundwater levels are as shown 'I
on the boring logs
3. Borings were located by JAC and elevations were extrapolated from the USGS topographic map.
• Project No.: D08.038
Hello