HomeMy WebLinkAbout03133 - Technical Information Report - Geotechnical 1 1
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E N G 1 N E E R 5
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npril 22, 2003 Cl�'OFREjy�-�NNIA��, '
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APR 2 y 2c,
Keith Menges �EC
��>>s N�: ?���, sr,-��� E1V��'
Kenlon, Washin�*t�,n 9R(1S(i
IZc����r1
(ieotcchnical (���n�ullali��n
I'reliminarv ('��.il ��linc I�a��ar�l
ACSeS5111e11I
}�0�4'af(� ��lOfl ���81
620 South 23�� Street
Rent�m. Washingl<�n
Cit�� of Renton PRF;APP tin. 113-(li?
I('t� I�ile N�. (1488-OUI
INTRODUCTION
'I�his report summarizes Icicle Creek Engineers' (ICE�s) preliininar� cc,al niine ha�ard assessineiit
fc�r the Floward Short Plat(City of Renton PREAPP No. 03-033) located at 6?0 Sc�uth 23��� Street in Rent��n.
Washington. Our services have been completed in general accordance witl� our Confirming Agreement datc�i
April 9, 2003 and were authorized by Keith Ntenges on April 9. 2003. 'rhe Flow�rd Short Plat is �li����n
relative to nearby p{iysical features on the Vicinity Map, i�igure I, and the Site Plan, I�igure 2.
We understand that Ntr. Menges is in the process of obtaining a building permit for this �r�,E,rrt�.
During this process, �ve understand that the City of Renton informed Mr. Menges that the south�vest c��rn��r
of the propert�� is located in a"coal mine hazard area." A coal mine hazard assessment is required h� th��
City c�f Renton to evaluate the potential for ground subsidence and tc� pr�vide house foundation desi���,
measures_ and/or delineate areas of the property to avoid house construction, as apF�ro�riate. or t�� miti��a�r
for�potential ground subsidenee (Renton Mtmicipal Code Title IV Development Regulatic�ns. Sectiun .�
(Geologic I�fa�ards), 2 (Special Studies Requirements).
SCOPE OF SF.RVICES
The purpose of our services „�as to complete a preliminary assessment c�f the potential haiarcis
associated with the past underground coal mining as a basis for identit�ying potentially developable are:i�
within the property. Specifically. our services included:
• Revie�ti�a��ailable historic coal mine records from the City of Renton, ��'ashington State Department ��f
Natural Resources and our in-house technical library to evaluate the location of the mined-out area�_
together with the depth of mining, thickness of zone mined and mining rnethods.
• Mine mapping including superimposing the identified mine onto a property base map and developin��
a geologic cross-section showing the location and depth of mined-out areas.
• Surface reconnaissance mapping to identify mine openings such as adits or air shafts. together ��ith
stockpiles of mine rock fill or other areas in �vhich the original ground surface has been altered.
• Classify the mine hazards as eitlter: 1) High C��al N1ine Haz_arcl �1rca�. ?1 �1e�li��in (���al '��line I I��i.i��i
nreas, or 3} I,ow Coa) Mine Hazard Areas.
�
Keith Menge�
I�pril 22, 2UO3
Page 2
• I?valuate the potenti�l for regional ground subsidence in High �nd Mediuin Coal IV1ine Hazard Areas
(��ertical ground subsidence, gro�md tilt and ground strain).
• I)evelop mitigation for huilding design and construction, if needed.
SITF, DF.SCRIPTION
SI'1'E GF,OLOGY
T�he Flo�vard Short Plat is underlain by bedrock of the Renton formaticm. Renton formation bedrock
consists of interbedded sandstone, siltstone, shale,claystone, carbonacec�us shale and coal heds. Structurall�,
the bedrock has been uplitted, folded and faulted over time. This sUuctural deformation of the hedrock has
caused the original hc�►-i�ontal bedding of the bedrock to become tilted. In lhe vicinity of the Howard Shc�rt
Plat,the"dip"or tilt of the bedrock bedding is about 50 degrees from horizontal dc���n to the north-norlheast.
'f�he bedrock is covered �a it1� weathered soil and gl�cial sediments var��ing in thickness from a fe��
feet to several tens of feet. 'f�he glacial sediments are referred to as Vashc,n age glacial till consistin�
primarily of dense to ver} dense silt�� sand �vith gra�el.
HOWARD SHORT PLAT SITE CONDITIONS
Our surface reconnaissance of the Ho��-ard Short }'lat �tias com�leted ��i� np►-il IO, ?U(1�. �I�h��
Ilo�vard Short Plat is about 0.75 acre in size and is bordered to tlie south by South 23rd Street and I alh��t
Park. to the west by Smithers Avenue South and residential development, and to the north and east h� rur;il
residential development.
From the�ti�est property line(Smithers Avenue South)the gmund surface slopes gently up tc, thc ea�t
to the east property line at about a 5 percent grade �vith overall vertical relief�f about 1� to 20 feet. ;�t thc
time of our site visit, it appeared that the propert�• had been recently cleared �vith an older house or hous�•�
removed. T�hree vehicles ���ere parked in the north portion of the 1lo�vard Shc�rt Plat along��ith a stockpi!�•
of detnolition �lebris. A new house foundation had been prcparcd in the sc�uth�vest corner of the pr<�pert�,
The remainder of the property is vegetated with grass and occasional clumps of blackberry vines that h�ci
been partially flattened by construction vehicles.
We did not observe an}' topographic depressions or other ground surface irre�ularities oi� the
property that may be associated «ith past mining activities. We did not observe any mine rock fill, such as
hrc�ken rock c�r cc�al fines, on the surface of the Ho�vard Short Plat.
�I�he excavation for the new house foundation in the south��-est corner c�f the site etposed about ? tc,
3 fcet �f weathered soil consisting of loose t� medium dense silty sand ��ith gravel and occasie�nal r�u�ts
underlain hy native glacial till. No surface water or seepage was observed in the fout�datic�n e�cavati��n
ABANDONED UNDERGROLINU COAL MINE DESCRIY"TION
GENFRAI.
Past un�ler�n,�ni�1 c��al niinin« in the F�roject �ite area ���a�� e��alu��te�i h� rc��ie��in� the ���,ll����in�,
documents:
• Morris��n Ki�ud�en. Januar�� 1�8�, �'F�:ngineerin�� In�estigation f�ur the Rent��n. A�'ashingtc�i� ,��rea.� � � �.
Department of the lnterior Office of Surface Mining, Abandoned I��1ine I,ands Program.
• Schasse, H.W., Koler. L.M._ F,berle,N.A. and Christie, R.A., May 1994, "T�he Washin�tc�n �tate ( e�,�l
Mine Collection Guide: A Catalog, Indcx and User's Guide," h•1ap K-�3�1, B and C-1�9ine 1�1aps of tlic
Sunbeam Mine, Renton Coal Company.
• Warren, W.C.,Norbisrath. H., Grivetti, R.tit., and Bro�vn, S.P., 19�15. "Preliminary Geologic �9ap ancl
E3rief f)escriptic,n �f the Coal Fields �f K.ing C�unt��, Washin��t�,n," l!nited States Ge��lc���ical Surve�.
1 plate.
(cicic (� ic� l. I� neincrr� ii.l�,Kllillnl,, �;
k���i, n���,��� �
npril 2?, 2O03
Page :�
RFNTON AREA MINING 1V1F.THOUS
'I he Rentcm area underground co�l mines �vere typicall�- develc��ed using breast-and-�ill�r (al«�
reFerred to as rc�om-and-pillar)mining methods. lnitial development of the iliine from the surface began �vith
a main slope (mine entry tunnel)driven do���n or parallel to the masimum di�� of the coal searn. "I'he main
slope served as the primary entr�� for the mine. An air shaft(s) ���as also driven at a separate location l��
provide forced air ventilation to the mine. �
/�t specified intervals alcmg the main slope, chutes were driven ur the coal seam. Cross-cuts �.ere
then driven beriveen the chutes. l he chules and cross-cuts were then �videned until lhe coal left in place(the
pillars)and ro�iilis a�mprised about a 1 to 1 ratio.
Most or all of the pillars �r•ere removed before abandonment of a level; thi�technique is referred t��
as fiill-pillar ettracticm. Full-pillar extraction is a nonna) underground mining process designed tc�maximize
coal extraction and to pr�mote short tenn collapse of the mined-out areas.
SUNI3EANi N1[NE
The Sunbeam Mine is located south of the Howard Short Plat and is one of a series of small mines
in the"I�albot area of Rent�n. According to historic mine production recc,rds. the Sunbeam I�1ine ��as active
from 1924 to 1929. None of the Sunbeam Mine workings underlie the I lo�ti�ard Short Plat: the closest the
Sunheam [�1ine came to the Ho�vard Short Plat is about 200 feet south of the southwest corner of the propert��
as shen+m on the Abandoned Underground Mine 1�1ap, Figure 3. A protile �f the Sunbeam Ntine relative ta
the Fl��ward Short Plat is shown on the Geologic Cross-Section. Figure 4.
Based on our review of the historic mine maps, the Sunbeam Mine ��as originally developed from
a main opening(t�vo mine entries and an ain�-ay)at a location approximately I,000 feet�vest�fthe }lo��ard
Short Plat. "I he main haulage��ay tollowed the coal seam for about 3,500 feet east-southeast ���here it was
terminated at a`fa�ilt'�(the coal bed was offset by previous structural deformaticm) in the area where Benson
Road is located about 2,000 feet east-southeast of the Howard Short Plat. 'I�he Sunbeam Mine�vas primarily
worked on a single level by driving chutes and cross-cuts updip at about a 50 degree angle from the main
haulage�vay. Near the Sunbeam Mine entry area, the Sunbeam Mine was worked to a "deeper" level,
referred to as the "2��d I,evel."
GENERAL DESCRIP"TION OF HAZARUS ASSOCIATEI) �VITH COAL MINF.S
I�he principal ph}sical hazards associated ��-ith abandoned coal rnines include the follo�ving:
• �inkholes(High Coal N1ine Flazard Areas)
• Regional ground subsidence (Medium Coal Nline Hazard Areas)
• N�n-affected areas(I,o�v Coal Mine Hazard Areas)
I�he Rentc�n ti1unicipal Code 'I�itle IV Development Regulations ciefines coal tnine hazards as
t��llcnts:
Hi�h Coal Mine Haz�rd -.9rec�,c i��ilh crbnitdonec�anc�in�J�roperlv.�e�ulecl mrne openiuK.c cnrd c�reci.c underluirr
h�•mine lror•kir��s shcr/lntirer�thai� tu•n hu�rdred feet (200'1 i�r deptlt for•sle�j�li'rlij���i��g seame, or•.�•Ircrlloir��r
1hun,f fteen (/5) timcrs�he thick�r�s.c r�f!he,sernn o�-irn�•ki�lx.s for��errllt�dip��i�i,�'.seam.�. 7he,��c� ar•c�u.s mci�� l�e �
u�feclec!hy collcr/�,cc� ��r c��Ire�•.ctrh,��idc�nrc�. '
Medium Coal Mine Hazards—.Areas where the »ririe til�orkirrgs ure deeper lhan tiro Irundf•ed fec:� (�l)I)')
f�»� .stee��l�' LII�)�71/1�,T,tic�nrn.s. or•deepe�• tha�i f fleerr (IS) linres the thick�re.s.c ��f�Ite .cenm r��r gerrtlt� cli����r11,L�
�rrrnrs. Tl�e,ce ai•E:ac »tnl•he arfected b}%st�bside�lce.
Low Coal Mine Hazards—Ar•ea,c irillr�ro k��otivrt nrine workirrR.c rn�d rr���n�edicic��!.c��l,,crdencc�_ !��'JrrJ�� n�,
r�lrrres crre knn►�•n irr lhe,se cn•ens, tntd��ctnne�rted nrrr�ing is knowri to hm•e occ�rn•►�f��l �
Iriclr (' rcek I n !� inrrr� 111R4n(illll„i�; �
Kcith Menges
�1�ril 22, 2003
Pagc �1
ANAI.YSIS OF COAL MINF, HA7.ARU�
HIG11 COAL MINF, HA7.ARD .AREAS
"l�he Sunheam Mine daes nc�t underlie the Iloward Short Plat. Iligh Coal Mine Ilazard nreas
assc�ciated �vith the Sunbeam titine exist, but are south of the F�o�vard Shc�rt Plat as sho�yn c�n Figures 4 and
i. No I ligh ('c�al Mine I lazards exist �vithin the }Ic��vard Short Plat.
NiF,UIUM COAL I��iINF. IIA7,ARU AREAS
I he Sunbeam Mine is situated far enough s�uth of the Flo�vard Short Plat that no effects of regional
gruuncl suhsidence �re pc�ssihle. I he area p<�tentially lffected by re�i<�n�l grc�und suhsidence is shcnvn c�n
Fi�ures 4 and 5; the ef�feeled area is south of the Flo���ard Short Plat. Nc� Medium C'c�al Mine I�azards exitit
��ithin Ihc Hi�ward �hc,rt I'lat.
LOW ('OAL MINE HAZARU .AREAS
N� kno��n undocumented a�al mining occurred within the Ho�vard Sh<�rt Plat hased on c�ur re�ic��
c�t hist��rical rnine mars. Nc� Lc�w Cc�al N1ine Hazards e�ist �vithin the f Ic,��are1 She�rt PIaL �
CONCLUSIONS
liasecl cm e�ur revie« c�f available infonnation and analvsis ofec�al mine hazards at the Ho�vard Short
Plat. �ve have developed the follo��-ing conclusions:
• I�he abandoned underground Sunbeam Mine is located south of the Fto��ard Plat, hut does not underlie '
the Floward Short Plat as sho��n on Figures 3 and 4. ',
• Nc� coal mining-related surface features (mine openings or sinkholes) ��ere c�hser��ed on the f Ic���ard '
Short Plat at the time ot�our recemnaissance of the property on npril 10, �003. ,
• N� I Iigh, Medium or Lo�v Coal Mine Ha���rd Areas exist at the I Irntard Short Plat because the Simheam
Mine is located south an adequate distance to preclude any potential ground subsidence impacts from
the collapse of this mine as sho«�n on Figure 5.
• No tnine rock fill or�mdocutnented mine workings occur on the Howard Short Plat based on our surface
reconnaissance. ICF,should be contacted for review and evaluation if mine rock fill or undocumented
niine ����rkin�s are encc�untered durin� site grading.
'�i ITIGATION
1Ve cl<� not recommend any specific mitigation assoeiated with coal mine hazards at the fl����ard
Sl��,rt I'lat �rc�jCct sitc.
USE OF THIS REPORT
1�c ha�e E�re��are�l thi: rep��rt for Keith Menges for use in evaluating coal mine hazards at the
F�rc���crt� subject to this consultation. Uur report, conclusions and interpretations should not be co►�strued
as a �varrantv of subsurface conditions at the site.
W'ithin the limitations of scope, schedule and budget,our services have been executed in accordance
«ith ��rnerally accepted practices in this area at the time the report ��as prepared. No �+arranties or othrr
c��nditi��ns, express <�r imE�licd. ehould he underst���,d.
�*****�**********xM*
I � i � lr l� rcc4; I n <� inccr� 1118�n(�� 11!„��;
Keith Menges 'i
�lpril 22. 2003 I
Pa�e �
l�l+'e trust this repc�rt meets y�ur present needs. Please call if you ha��c �ny questic�ns concerning this
rc�c�rt.
.,i • .
v<` Yoin�s ver�� trulv,
(� ' Icic Creek F:ngineers, Inc.
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Explanation:
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0 200 40o A Location of Cross-Section
� Scale in Feet
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� Icicle Creek Engineers Abandoned Underground Mine Map - Figure 3
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v
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rn
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m
A A�
(north) (south)
400i 400
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� Howard Coal Mine Hazard �
c � �Short Plat� Area -�:
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of regional ground ,
subsidence area) '� '
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0 200 400
Horizontal Scale = Vertical Scale
Scale in Feet
0
0
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0
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� Icicle Creek Engineers Geologic Cross-Section A-A' - Fi ure 4
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m � South 21 st Street
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South 23rd Street �
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Talbot Park
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Explanation:
0 200 400 - High and Medium Coal Mine Hazard Area
o Scale in Feet
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� Icicle Creek Engineers Coal Mine Hazard Map - Figure 5 _