Corps of Engrs App Per WetlandsMEM
ORANDUM
Janua~ 18,2002
TO:
FROM:
SUBJECT:
The Honorable Mayor and City Council Members
Michael C. Van Miliigen, City Manager
Corps of Engineers application permit for Wetlands
Attached is a joint application form to the U.S. Army Corps of Engineers from the
Dubuque County Historical Society and the City of Dubuque pertaining to the proposed
Mississippi River Discovery Center. This application requests permission from the
Corps of Engineers to construct the Museum wetlands, ncluded in this construction is
1 ) dredging of an area adjacent to the wetlands; 2) installation of a soil embankment; 3)
extension of the storm sewer box culvert; and 4) installation of a floating boat dock and
ramp adjacent to the embankment. This application replaces an application that was
previously submitted in June 2000, which also included the installation of a roadway
along the west-end of the ice harbor. The June 2000 application was placed on-hold
pending resolution of design and funding issues for the roadway. The City has recently
hired IIW Engineers to complete preliminary design for the roadway; however, it will be
several weeks before this design is complete. Due to the 120-day waiting period
required by the Corps, the Dubuque County Historical Society is asking the City to
submit this joint application in order to implement the construction schedule for the
wetlands. The City will submit an application to the Corps at a later date for the west
roadway.
I concur with the recommendation and respectfully request Mayor and City Council
approval.
Mk~hael C. Van Milligen
MCVM/cs
Attachment
cc: Barry Lindahl, Corporation Counsel
Cindy Steinhauser, Assistant City Manager
cc: Pauline Joyce, Administative Services Manager
I
January 18, 2002
U.S. Army Corps of Engineers, Rock Island
Atto: CEMVR-RD
Clock Tower Building
Post Office Box 2004
Rock Island, Illinois 61204-2004
Iowa Department ofNataral Resoumes
Wallace State Office Building
900 East Grand Avenue
Des Moines, Iowa 50319-0034
Re:
Mississippi River Discovery Center
Ice Harbor- Dubuque, Iowa
IIW Project No. 97045-t9
On behalf of the Dubuque County Historical Society (DCHS) and the City of Dubuque, IIVf
Engineers and Surveyors, P.C. (IIW) has prepared the attached Joint Application Form
pertaining to the proposed Mississippi River Discovery Center (MRDC) Phase II
improvements. This application replaces the previous application submitted in June 2000,
which, as we understand, was placed "on hold" pending resolution of funding and the scope
of work. This application does not include a proposed roadway along the west edge of the
Ice Harbor, which was included in the June 2000 submittal. IIW recently received a
contract from the City of Dubuque to complete a pmliminury design for the west roadway
project. IIW has provided correspondence dated December 14, 2001 to Ms. Dorie Bollman,
as requested, to illustrate the projects likely to occur in the Ice Harbor in the near future.
We have provided the following summary to supplement item 5. Project Description and
Remarks contained on the attached Joint Application Form.
The Museum wetlands are part of the Mississippi River Discovery Center project. The
completed wetland will include a boardwalk for visitors to view the numerous plants,
wildlife and museum exhibits, The wetland footprint encompasses approximately 1.4
acres from the existing embankment at pool elevation 592 to the toe of the wetland
confinement berm at elevation 574. The wetland confinement berm along the east and
south perimeter is a 3:1 slope extending from the top of the berm at elevation 603.5 to
the river bottom sand layer. The intent of the confinement berm is to hydraulically
isolate the Ice Harbor pool from the wetland normal pool elevation 598. The
construction of the wetland will be as follows:
Mechanically dredge the "fat clay" material, as shown on the attached river borings~
to an approximate elevation of 574 in the area designated on the drawings. The
intent is to perform this activity under the City of Dubuque's Department of the
Army Permit Number CEMVR-OD-P-407500. Since the proposed mechanical
dredging limits exceed the limits of the aforementioned permit, IIW is providing
documentation to the City of Dubuque for requesting a variance from the
Department of the Army relating-to the dredging limits and material disposal site.
Place sand to elevation 595. The imported sand fill will be either hydraulically
dredged sand or sand trucked to the site from an off site source. The dredge borrow
IIW Engineers & Surveyors, P.C.
Dubuque, IA Guttenbe~. IA Hazel Green. WI
INTEGRITY. EXPERTISE. SOLUTIONS.
Dennis E Waugh, PE/SE
Charles A. Cate, PE
Gary D. Sejkora PE
Michael A. Jansen, PE/SE
Ronald A. Balmer, PE/SE*
John M. Tragmer, PLS
Ross K. Abbott, LSIT
q2mothy J. Tranel, PE
John E Waadsnlder, PE
Julie P. Neebel, PE
James I~ Kaune, PE
Thomas J. Oster, P~S
Jason E, Miller. PE
Wray A. Chi!ders, PLS
*Licensed ilch/l¢cl IL, Wt, MN, SD
Civil Engineering
Structural Engineering
Environmema~ Engineering
Municipal Engineenng
Transportation Engineering
ArcldtecmraI Engineering
Land Surveying
Quality Control Testing
Informmion Technology
4155 Pennsylvania Avenue
Dubuque, Iowa 52002-2628
563.556.2464
563.556.7811 fax
wwwJiwengr, com
US Army COE / Iowa DNR
January i8, 2002
Page 2 of 3
area is located on the west side of the Ice Harbor as illusmated on the attached drawings.
Install a clay embankment and liner with a minimum thickness of 3 feet. This is based upon the DCHS
acceptance of the operational criteria such that the wetland pool elevation shall be not more than 4 feet
below the Ice Harbor pool elevation. This is compatible with the current operating conditions for a
normal wetland pool of 598, and a raaximum Ice Harbor pool elevation of 602, at which time the gates
are closed and the flood pumps are engaged. The clay will be imported from an offsite source with strict
control on the material properties and installation.
4. Place subsoil and topsoil to final grades, and install plantings as illustrated on the attached landscaping
plan. The harbor side embankment will be protected with a geo-textile fabric, filter layer, and rip mp
shoreline protection to an elevation of 592, and beneath the wetland walkway. The remaining exposed
embankment between 592 and the walkway will consist of a bio-eng/neered system as illustrated.
The hfe support system for the wetland will include the geothermal well discharge from the MRDC Phase
I building mechanical system as a fresh water source. Discharge from the wetlands will be controlled by
an outlet structure with 3 adjustable weir plates to control the wetland pool elevation, a gravity discharge
pipe with a submerged outlet into the Ice Harbor, an actuated slide gate on the gravity discharge pipe, and
a submerged electric pump and force main with a control valve. The outlet structure is designed to isolate
the relatively constant wetland pool elevation (597 to 599) from the fluctuating Ice Harbor pool elevation
(592 to 602), by inenrpomting the slide gate, submerged pump end force main when the Ice Harbor water
levels are near or above the wetland pool level. The magnitude, duration, and frequency of discharge
from the wetlands, and the area occupied by the wetlands, has been coordinated with the City of Dubuque
Engineering Department relating to the flood control capabilities of the Ice Harbor.
B. The storm sewer box culvert extension illustrated on the site plan will extend the existing storm sewer to the
new wetland embankment and discharge into the Ice Harbor. The storm sewer extension will be a 6 ft. x 6 ft.
concrete barrel, concrete apron and curtain wall, tapered headwalls, and rip rap stabilization / energy
dissipation at the discharge end. Concrete retaining walls and a sand beach area in the vicinity of the box
culvert extension discharge are proposed and are illustrated on the attached drawings.
C. The floating boat dock and access ramp adjacent to the south / southeast embankment is comprised of a
timber structure for access to research vessels associated with the MRDC. Driven timber cluster piles provide
gravity and lateral support for the access ramp, and guided support for the floating dock during low water
conditions. The access rmrrp is designed to float as the Ice Harbor pool levels rise and the timber piling
provide guided support for the floating ramp and dock.
D. The William M. Black is currently docked along the north edge of the Ice Harbor. The vessel will be
temporarily relocated to the southwest shore of the Ice Harbor to enable the construction of the wetlands. The
Black will be permanently relocated adjacent to the east embankment of the wetlands and will be connected to
shore with an access ramp from the upper deck, and an access ramp from the louver deck. The Black is
currently a publicly accessible exhibit associated with the IvlRDC, with the intent of becoming a "boat and
breakfast" for overnight accommodations.
E. The south edge of the Boatyard area represents a portion of the north edge of the Ice Harbor. The
embankment adjacent to the water's edge will be stabilized with ripmp shoreline protection, and periodic
plantings. The Boat Launch exhibit is an active boat launch, recovery and m-launch of an MRDC vessel.
The construction activity associated with the boat launch consists of mechanically dredging the "fat clay"
material, placing sand fill, geo-textile fabric, bedding, and rip rap shoreline protection. Heavy timbers ways
US Army COE / Iowa DNR
January 18, 2002
Page 3 of 3
are placed on a slope and a timber cribbing assembly supporting the vessel slides down the ways to launch the
vessel.
We would welcome the opportunity to discuss this application with you, should you have any questions. Please
feel free to conrac~ our office. We look forward to heating from you.
Sincerely,
ENGINEERS & SURVEYORS, P.C.
Michael A. Jansen, P.E., S.E.
Vice President
Attachments
Copy:
Mr. Jerry Enzler
Dubuque County Historical Society
3~a Street Ice Harbor
Dubuque. IA 52001
Mr. Mike Van Milligan
City of Dubuque
City Hall 13th & Central
Dubuque, IA 52001
Mr. Robert Aydlett
Esherick, Homsey, Dodge & Davis
500 Treat Avenue, Suite 201
San Francisco, CA 94110
Mr. James Kolf
Durrant Group
700 Locust St., Suite 942
Dubuque, LA 52004-0509
JOINT APPLICATION FORM
rt'E~lS 1 AND 2 FOR AGENCY USE
1. Applica~on Number 12. Date Received
/
3. AND 4. ( SEE SPECIAL INSTRUCTIONS) NAME, MAILING ADDRESS AND TELEPHONE NUMBERS
Mississippi River Discovery Center, Ice Harbor - Dubuque. Refer to at~ac~ed letter and drawings.
7. PROJECT LOCATION
described in this application.
knowJe~at~s~~d~.~,/r~ accurate. I further, certify that I possess, the au~hor~t~~posed~//~,~ ~ ~v~activities'
t 2Ji~ti~f A~pplicent °r Auth°rized Agent ' ~ Da~
~ARTMENT OF NATURAL RESOURCES -ATTENTtON: SOVEREIGN LANDS - SEE INSTRUCTIONS FOR ADDRESS
DNR FORM 3{~
JOINT APPLICATION FORM
ITEMS 1 AND 2 FOR AGENCY USE
I
Mississippi River DiscovePj Center Ice Harf3or - Dubuque. Refer to attached letter and drawings.
IOWA DEPARTMENT OF NATURAL RESOURCES - ATTENTION: FLOODPLAIN PERMIT SECTION - SEE INSTRUCTIONS FOR ADDRESS
DNR FORM 36
JOINT APPLICATION FORM
3. AND 4. ( SEE SPECIAL INSTRUCTIONS) NAME, MAILING ADDRESS AND TELEPHONE NUMBERS
Mississippi River Discovery Center, Ice Harbor- Dubuque. Refer to attached letter and drawings.
S OF ENGINEERS IOWA DEPT. OF NATURAL RESOURCES ATTN: FLOODPLAIN PERM[TS
IOWA DEPT. ~OF NATURAL RESOURCES A~TN: SOVEREIGN LANDS APPLICANT COPY SEPT. 1987
July 7, 1997
IIW Engineers and Surveyors. P.C.
4155 Pennsylvania Avenue
Dubuque, Iowa 52002-2628
'lrerracon
CONSULTANTS. iNC.
1216 West 76th Stree~
P.O. Box 2025
Dave~oorL Iowa 52809
f319} 391-6226 Fax: f319/391-3202
Denn s E. Whited. P.E.
Paul J. ~chnyder. P.E,
Attention:
Re:
Mr. Dennis Waugh
Rive~ Borings
Proposed River Discovery Center
Ice Harbor and East 3rd Street
Dubuque, Iowa
Job No. 07975046
Dear Mr. Waugh:
The river borings for the above referenced project have been completec Boring logs and a
location sketch are included with this letter. The borings were located in the field by IIW
Engineers & Surveyors and are shown on the attached sketch.
The borings were performed ~vith a track-mounted rotary drill dg equipped with a hydraulic head
employed in drilling and sampling operations. A working barge was used to position the dg at
the desired locations. The borings were cased into the sand layer, and a rotary wash bodng
technique was used. Representative soil samples were obtained from the borings using a split-
barrel sampling procedure in accordance with ASTM D-1586. In the split-barrel sampling
procedure, a standard 2-inch O.D. split-barrel sampling spoon is driven into the ground with a
140-pound hammer falling a distance of 30 inches. The number of blows required to advance
the sampling spoon the last 12 inches of a normal 18-inch penetration is recorded and used to
estimate the relative density of cohesionless soils, and to a lesser extent, the consistency of
cohesive soil. The blow counts are p~'ovided on the boring logs at their depths of occurrence.
The samples were tagged, sealed in the field and returned to our laboratory for testing and
classification.
An automatic SPT hammer was used to advance the split-barrel sampler in the borings performed
for this project. A greater efficiency is achieved with the automatic hammer as compared to a
conventional safety hammer operated with a cathead and rope. This higher efficiency has an
QUALITY ENGINEERING SINCE 1965
Proposed River Discovery Center - River Borings
Dubuque, Iowa
Job No. 07975046
July 7, 1997
Terraoon
appreciable affect on the standard penetration resistance blow count (N) values. The effect of the
automatic hammer's greater efficiency and correlations with the standard penetration test
(SPT)indicate that the automatic hammer's blow counts should be multiplied by a factor of about
1.3 to obtain the approximate standard penetration resistance values
The soils encountered in the boring were classified by the drill crew based on visual
observations, texture and plasticity of disturbed samples. The descriptions were modified
based on laboratory testing and visual observation.
The samples recovered from the boring were tested in the laboratory to obtain their natural water
contents, which are provided on the bodng logs. The soil samples also were classified in the
laboratory based on visual observation, texture, and plasticity. The Soil descriptions and
estimated group symbols presented on the boring logs are in accordance with the enclosed
General Notes and the Unified Soil Classification System A brief description of this classification
system is attached to this report.
The water surface elevation at the bodng locations was obtained from the Corp of Engineers, and
referenced the Dubuque gage reading for June 4, 1997.
We have not been asked to interpret the data or to make design and construction
recommendations for the project. Therefore, we cannot assume any responsibility or liability for
nterpretation of this data by others. However, should you wish us to make such interpretations
for the project, we would be pleased to do so in accordance with our standard fee schedule.
We appreciate the opportunity to be of service to you on this project. Should you have any
questions concerning the enclosed information, or if we can be of fur[her service to you 'n any
way, please contact us.
Proposed River Discovery Center - River Borings
Dubuque, Iowa
Job No. 07975046
July 7, 1997
Terracon
Sincerely,
TERRACON CONSULTANTS, INC.
~'Prepa~ ~
W. Ken Beck, P.E.
Iowa # 10684
' WKB:ket:N:~Projects\07975045'~eport2
Enclosures
"----~aul J. Sc~'~'~Ydt~er, P.E.
Iowa # 8222
LOT
10.35
'¢~B-2
MISSISSIPPI RIVER
Note: This location diagram is not to scale and is intended for general location purposes only.
Boring Location Sketch - River Borings
Proposed River Discovery Center
5rd Street and The Ice Harbor
Dubuque, Iowa
~Job No. '07975046I Date: 4-/22/97
J Drawn By: NA
lEarracon
LOG OF BORING NO.~ B-2
Page 1 of 2
CLIENT ENGINEER/ARCHITECT
DUBUQUE COUNTY HISTORICAL SOCIETY IIW ENGINEERS & SURVEYORS, P.C.
· SITE EAST 3RD & THE ICE HARBOR PROJECT
DUBUQUE, IOWA THE RIVER DISCOVERY CENTER
DESCRIPTION ~: ~- ~-' ~- '~ co ~ ~u o 0~ >- ~°~ ~ SAMPLES >~ --~ ~ ~ : ~ ~ ~ ~ ~ ~z ~ TESTS o~ ~ ~ ~z~ ~'
lApprox. Surface Bev.: 595. ft. ~
J8 WATER CA
5--
587 --
~ FATCLAY (ALLUVIUM) - CH 1 SS 24 0 94.3~
~ Dark Brown to Gray
Very So~ 10-- WB
--CH 2 SS 0 89.5
- WB
~18 577
~%s~ILW, SAND (ALLUVIUM) 20~ SM 3 ~ 6 5 25.1
:'::':: 25 ~ WB ,
':'- 30~ WB
~The stratification lines represent the approxim~e bounda~ lines Calibrated Hand Penetrometer
~ between soil and rock types: in-situ, the transition may be gradual. 140 Lb. Auto. S~ Hammer**
I WATER LEVEL OBSERVATIONS [~) BORING STARTED 6-4-97
IWL i~ IZ ~ ~ BORING COMPLETED 6-4-97
Iw.l,' /ierracon RIG ¢37 FOREMAN SZ
L t
LOG OF BORING NO. B-2
Page 2 of 2
CLIENT ENGINEER/ARCHITECT
DUBUQUE COUNTY HISTORICAL SOCIETY IIW ENGINEERS & SURVEYORS, P.C,
SITE EAST 3RD & THE ICE HARBOR PROJECT
DUBUQUE, IOWA THE RIVER DISCOVERY CENTER ,
SAMPLES t TESTS
..u DESCRIPTION '-:- ~ _~ ~u .
<~ ~ 03 0 ~~ ,~2 oZ
.....'."-" FINE TO COARSE SAND (ALLUVIUM)I{ 14.2
"'--'-"- Brown - SP 6 SS 101 6
:'i'~:'?- Loose
.-'.'.-i 35-- WB
:.. Medium Dense below about 37 feet -
.:-::-? --
i'-":'"...;:.... --SP 7 SS 18i 9 112.5
..-.:.? 4-0-- ~NB
':'::':-':: '. _--SP 8 SS 18I. 11 16.1j
:'::':'::
i';:.'i'!i. - $9.5 545.5 -iSP 9 SS 18 19 16.1
BOTTOM QF BORING
WATER LEVEL QBSERVAT1ONS (F-F) BORING STARTED 6-4-97
WL~' ~_ ·
BORING COMPLETED 6-4-97
erracan sz
WL
WL
APPROVED WKB JOB # 07975046
LOG OF BORING NO, B-3
Page 1 of 3
CLIENT ENGINEER/ARCHITECT
DUBUQUE COUNTY HISTORICAL SOCIETY IIW ENGINEERS & SURVEYORS, P.C.
SITE EAST 3RD & THE ICE HARBOR PROJECT
DUBUQUE, IOWA I THE RIVER DISCOVERY CENTER
~ DESCRIPTION ~-~' ~m ~ ~ ~ ~ ~
~ ~ ~ ~ O ~ ~ ~O~
~Approx. Surface Dev.: 595 ft. ~ ~ ~ ~ ~
,~9 WATER - CA
586 --
~ FAT CLAY ~ALLUVlUM) - CH 1 SS 24 0 92.5
~ Dark Brown to GCay 10~
Very Soft NB
- CH 2 SS 24 0 91.5
15~ WE
~18 577 ~
~ CLAYEY SAND (ALLUVIUM) - SC 3 SS 18 2 36.4
~ Brown and Gray -
Very Loose to Loose ' 20~ WB
~:.~:.:.::~ FINE TO COARSE SAND (ALLUVIUM) --
~lv~mDense ~ ~SP 4 SS 18 10 179
25~ ~B ~
[;; - SP 5 SS 18 13 13.5
[t::.:::l 3o- WB
Gontlnu~d ~xt Pa~ ~
The ~tratific~t~on lines ropresent the *~proximate boundarg lines ' Calibrated H~nd ~en~trometer*
b~een soil and rock ~pes: in-situ, the transition may be gradual. 140 Lb Auto S~ Hammer**
WATER LEVEL OBSERVATIONS (~) BORING STARTED 6-4-97
WL ~ ~ ~ m BORING COMPLETED 6-4-97
I:rl , r erracon RIG E37 FOREMAN SZ
~WL I APPROVED WKB JOB · 07975046
LOG OF BORING NO. B-3
Page 2 of 3
CLIENT ENGINEER/ARCHiTECT
DUBUQUE COUNTY HISTORICAL SOCIETY ItW ENGINEERS & SURVEYORS, P.C.
SiTE EAST 3RD & THE ICE HARBOR PROJECT
DUBUQUE, IOWA THE RIVER DISCOVERY CENTER
SAMPLES ~ TESTS
o DESCRIPTION ~' >: ~ -
.:-..FINE TO COARSE SAND (ALLUVIUM)
";:'):; Medium Dense
:'::'.-~: 37.5 557.5
i..:;~l FINE SIL~ SAND (ALLUVIUM) -SP/ 7 SS 14 11 22.3
Medium Dense
..:.) ZSM 8 SS 121 1I 25.SI
-SM 9 SS 10 6 19.2
"'" 50-- WB
... :.. FiNE TO COARSE SAND (ALLUVIUM) --
'"]:'?] Brown SP 10 SS 8 16 17.7
· '..v' Medium Dense ,
".:v' SP 11 SS 12I 17 18.6
' ':" 60-- WE
The stratification lines represent the approximate bounda~ lines Calibrated Hand Penetrometer*
between soil and rock types: in-situ, the transition may be gradual 140 Lb. Auto, S~ Hammer**
WATER LEVEL OBSERVATIONS (~) BORING STARTED 6-4-97
WL BORING COMPLETED 6-4-97
NL · ~ erracon RIG ~37 FOREMAN SZ
NL APPROVED WKB JOB ~ 07975046
LOG OF BORING NO. B-3
Page :3 of 3
CLIENT ENGINEER/ARCHITECT
DUBUQUE COUNTY HISTORICAL SOCIETY IIW ENGINEERS & SURVEYORS, P.C.
SiTE EAST 3RD & THE ICE HARBOR PROJECT
DUBUQUE, IOWA THE RIVER DISCOVERY CENTER
SAMPLES I TESTS
~ DESCRIPTION ~ ~ >: "~ ~ ~ z =:
· .~:.;.:; FINE TO COARSE SAND {ALLUVIUM) _ - WB
:.. Brown -
:- · Medium Dense
'-'-.'-: - SP 13 SS 10 26 16.3
:.:i.:.:: 69.5 525.5 -
BOTTOM OF BORING
The stratification lines represent the approximate boundary lines Calibrated Hand Penetrometer*
between soil and rock types: in-situ, the transition may be gradual 140 Lb. Auto. SPT Hammer**
WATER LEVEL OBSERVATIONS (FT) BORING STARTED 6-4-97
WL ~ !_~- mi · BORING COMPLETED 6-4-97
,, erracon sz
WL APPROVED WKB; JOB # 07975046
UNIFIED SOIL CLASSIFICATION SYSTEM
Soil Classification
Group
Symbo~ Group Names
GW Well-graded graval~
Cu < 4 and/or 1 > Cc > 3E GP Pborly graded gravelF
Sands Clean Sands
50% or more of coarse Less than 5% finesE
fraction passes
NO. 4 sieve
Sands with Fines Fines classify as ML or MH
More than 12% fines~ Fines cla.ssify as CL or CH
SC Clayey sandG,~,
Fine-Grained Soils
50% or more passes [ne
No. 200 sieve
Silts and Clays inorganic
Liquid limit less than 50
orgamc < 0,75 OL
Silts and Clays inorganic
Liquid limit 5~ or more
Liauid limit -- oven dried Organic clayK' L. M, p
organic < 0.75 OH
~Cu = Dg~,0 cc =
6If fines alassi~ as CL-ML, use dual symbol GC-
GM. or SC-SM.
group name.
Mt_ silty clay.
KIf soil contains 15 to 29% plus NO. 200. add
'With sand" or -with gravel'~ whichever is
"4If soil contains -> 30% alus No. 200.
oredominant y ~ravel, add "gravelly" t(~ group
60
then PI = 0.73 (LL ~ 20) ,
- Equation of "U" - line=7/ - '-~-O~' --J/ [ ~
Ve~ical at LL = 16 to PI = 7, / ~/~
then PI = 0.9 (LL - 8) __ /
L' ~-?L:-ML--~ / MLoROL
50
3O
20
0
0 10 16 20 30 40 50 80 70 80 90 16{~ 110
LIQUID _IMIT (LL)
'lfierracon
GENERAL NOTES
DRILLING & SAMPLING SYMBOLS:
'SS
ST
PA
HA
DB
AS
HS
Split Spoon - 1%" LD., 2" O.D., unless otherwise noted
Thin-Walled Tube - 2' O.D., Unless other'wise noted
Power Auger
Hand Auger
Diamond Bit - 4", N, B
Auger Sample
Hollow Stem Auger
PS Piston Sample
WS Wash Sample
FT Fish Tail Bit
RB Rock Bit
BS Bulk Sample
.PM Pressuremeter
DC Dutch Cone
WB Wash Bore
Standard "N" Penetration: Blows per foot of a 140 pound hammer falling 30 inches on a 2 inch OD split spoon,
except where noted.
WATER LEVEL MEASUREMENT SYMBOLS:
WL Water Level WS : While Sampling
WCI Wet Cave in WD : While Drilling
DCI Dry Cave In BCR : Before Casing Removal
AB After Boring ACR : After Casing Removal
Water levels indicated on the boring logs are'the levels measured in the bo. rings ~t the times indicated. In pervious
soils, the indicated levels may reflect the location of groundwater. In low permeability soils, the accurate deter-
mination of ground water levels is not Dossible with only short term observations.
DESCRIPTIVE SOIL CLASSIFICATION:
Soil Classification is based on the Unified Soil Classification System aha ASTM Designations D-2487 and D-2488.
Coarse Grained Soils have more than 50% of their dry weight retained on a ,~00 sieve: they are described as:
boulders, cobbles, gravel or sand. Fine Grained Soils have less. than 50% of their dry weight retained on a #200
sieve; they are described as: clays, if they are plastic, and silts if they are slightly plastic or non-plastic. Major con-
stituents may be added as modifiers and minor constituents 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 relative in-place
density and fine grained soils on the basis of their consistency. Example: Lean clay with sane. trace gravel, stiff
(CL); silty sand, [race gravel, medium dense (SM).
CONSISTENCY OF FINE.GRAINED SOILS:
RELATIVE DENSITY OF COARSE-GRAINED SOILS:
Unconfined Compressive N.BIowslft. Relative Density
Strength, Qu, psf Consistency 0-3 Very Loose
< 500 Very Soft 4-9 Loose
500 - 1,000 Soft 10-29 Medi Jm Dense
1,001 - 2,000 Medium 30-49 Dense
2,001 - 4,000 Stiff 50-~0 Very Dense
4,001 - 8,000 Very Stiff 80 + Extreme[y Dense
8,001 -16,000 Hard
> -16,000 Very Hard
RELATIVE PROPORTIONS OF SAND AND GRAVEL
Descriptive Term(s)
(of Components Also Percent of
Present in Sample) Dry Weight
Trace < 15
With 15 - 29
Modifier > 30
RELATIVE PROPORTIONS OF FINES
Descriptive Term(s}
(of Components Also Percent of
Present in Sample) Dry Weight
Trace < 5
With 5 - 12
Modifier > 12
GRAIN SIZE TERMINOLOGY
Major Component
Of Sample Size Range
Boulders Over 12 in. (300mm)
Cobbles 12 in. to 3 in.
(300mm to 75mm)
Grave 3 in. to #4 sieve
(75mm to 4.75mm)
Sand ~z to #200 sieve
(4.75mm to 0.075mm)
Silt or Clay Passing #200 sieve
(0.075mm)
'i rerracon___