HomeMy WebLinkAbout1.01 Geological Hazards ReviewSTATE OF COLORADO
COLORADO GEOLOGICAL SURVEY- seruing the people of Colorado
Department of Natural Resources
1313 Sherman Street, Room 715
Denver, CO 80203
Phone: (303) 866-261 1
Fax (3@) 866-2461
COLORADO
RESCI.IRCES
Bill Ritter, Jr.
Govemor
Haris D. ShEman
Executive Director
Vincent Matthews
Division Director and
State Geologist
Thank you for the land use application referral. At your request and in accordance to
Senate Bill 35 (1972) this office has reviewed the materials submitted by your office and
considered the geologic hazards and geologic conditions that may affect the land use
development. The reports submitted are the same that we reviewed in our 2006 review of
hon Bridge Phase 2 (CGS LUR No. GA-06-0006) dated December 27,2005 addressed to
Richard Wheeler. The CGS has also previously reviewed the entire sketch development
when it was previously called the Rose Ranch Development, with the first letter to Garfield
County Planning Department on October 30,1997 (CGS LUR No. GA-98-0006). Phase 3 is
the northernmost portion of Rose Ranch. A site specific investigation for Phase 3 was not
submitted. Please consider the following
In earlier reviews from this office, the CGS made its warnings clear that the major
geologic hazards that will likely impact this development are debris flows, sinkholes and
other subsidence phenomena related to evaporite bedrock dissolution (evaporite karst), and
collapsible soils. HP Geotech also commented at length about these hazards and the
potential risks. Concerns with debris flow hazards have been addressed by mitigation
designed by High County Engineering. Other hazards and risk remains.
The honbridge development is located in an area along the Roaring Fork River valley
that has the highest density of sinkholes in Colorado. Collapsible soils are dry, lower
density, soil where the soil structure collapses in on itself,loses volume, and densifies when
it becomes wet. Commonly called hydrocompactive soil, this type of soil thickly mantles
CGS LUR No. GA-07-0011 DEPARTMENT OF
lrgal: NW%, Sec. 1, iec. 12,T7S, R89w NATURAL
May 17,2007
Mr. Craig Richardson
Garfield County Building and Planning Department
109 8t Street, Suite 201
Glenwood Springs, CO 81601
RE: Geologic Hazards Review of Iron Bridge (Rose Ranch) Phase 3.
Dear Mr. Richardson,
most of the honbridge development. Soil collapse manifests itself as ground settlement. It
is our understanding that these geologic hazards have plagued developed portions of
Iron Bridge since development began in the early 2000s. Settlement damage has occurred
due to collapsible soil and recent spontaneous ground openings occurred in early 2005 that
damaged thi Ironbridge golf club facilities (see photo) just above Phase 3. HP Geotech
referenced another smalllr sinkhole that opened below the large one near the Phase 3 parcel.
We donrt not know the location of this newer sinkhole(s) since a revised report has not
been completed.
HP Geotech, in their earlier preliminary reports, mapped several small and larger
sized sinkholes throughout Phase 3 and made recommendation that these sinkhole locations
should be avoided byresidential structures (HP Geotech report dated February 12, 1998, Job
No. 197 327). Thatdoesn't appear to be the case. Lot layouts seem to have been placed on
these mapped sinkhole locations. Without the locations of the mapped sinkholes shown on
the plat, we can't be certain that the 20-foot setback has been adhered to. In our last review
correspondence to the county, we stated:
As far as we know, the northern parcel did not receive the level of subsurface
investigations into bedrock that the southern parcel of Filing I and the recreational
facility did. We believe that, with the recent nearby occurrences of two spontaneous
-
sinkholes (generally a rare phenomenon even in the evaporite karst terrain of the
Roaring Firk River valley), and other historic sinkholes mapped in the areafrom HP
Geotech's 1997 report, a similar level of subsurface investigations is warranted. We
,3:,i I'
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Photo #1. January 9,2005 sinkhole at Ironbridge golfclub facility.
believe the risk of subsidence is more elevated here than in other areas of the
I ronbridge Dev elopment.
Closing comments
Garfield County has prudently required notes on the plat that indemnifies the county
against damages related to subsidence or settlement related to the geologic hazards
mentioned above. We feel the risk of damage by settlement or ground subsidence to one or
more homes within Phase 3 is high over the average lifespan of a residential structure. It is
important that prospective homeowners are aware of these waming and have the time to
judge this risk for themselves, or hire an independent consultant to evaluate the risk for them.
For development to proceed, we recoflrmend the county require the following actions
and provisions:
Final plan sheets should show the locations of the sinkholes mapped by HP
Geotech, and building footprints for the lots that may be impacted;
Ttre drainage, grading, wet utility construction, and geotechnical recommendation
be complied with;
There hive been more culrent reports by HP Geotech for Phase 1 (report date{
May 31, 2OO5 *Job No. 105 115-3) and the Recreational Facility (report dated.
June 30, 2005). There should be an updated assessment by HP Geotech to insure
that the same level of geotechnical subsurface investigation is completed for the
current development plan for Phase 3. Garfield County should have, in plan
documents, an answer to the following question: Does HP Geotech still consider
the risk of ground subsidence related to evaporate dissolution to be "low" for
Phase 3;
A geotechnical consultant must be retained to inspect and evaluate all raw grading
surfaces, cutslopes, utility ditches, foundation, and any other excavations before
covered with structural fill, topsoil, erosion blankets, foundation elements, etc.
Such an inspection by a knowledgeable engineering geologist or geotechnical
engineer will insure, as best as possible, that exposed ground and soil conditions,
which may indicate local ground subsidence, will be discovered and appropriately
addressed. We believe the inspections are so important that the county should
consider making it a development requirement;
Site-specific foundation investigations be mandated for the individual sites and,
most importantly;
There is adequate disclosure of the potential risks to home owners concerning
potential settlement from collapsible soils and risk of spontaneous glound
openings related to evaporite karst phenomena. Prospective home and lot owners
must be made aware that normal homeowner's insurance does not cover damages
related to ground movements, including naturally occurring sinkholes.
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If any interested party has any questions about this review letter, please contact this
office at (303) 866-3551 or e-mail: ionathan.white@state.co.us
Sincerely,
Jonathan L. White
Senior Engineering Geologist
Cc: M. Sares, CGS EEG supervisor, e-mail attachment only
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Page I ofl
Graig Richardson
From:
Sent:
to:
Su$ct:
Jim Rada
Friday, May 11,2007 1:09 PM
Craig Richardson
lron Bridge Phase 3
Atlachmente: Jim Rada.vc{
Craig,
Unless I am missing something I have no substantial comments on this submittal. The following items are
general guidance.
I, A CDPHE Consfuction Stormwater prmit or an amendment to an existing permit should be in phce ftr
approval.
2. Application br or a letter stating no need for a construction permit ftom the CDPHE Air Pollution Conhol
Divlsion should be submitted br final apprcval.
3. I have requested a copy of the Roaring Fork Water and Sanitation Distict's most reent consumor
confidence rcport. The water quality data submitted is quile old and really does not serve itrs purpose br a
2007 application.
4. Developers need to abide by the Colorado noise statutes.
5. Storage of any hazardous materials on site during development needs b be managed in accordance with
applicable Federal, Stah and locallaws and regulations.
Thanks for the opportunity b reviar this application.
Jim Rada, REHS
Environmental Health Manager
Garfield County Public Health
195 W 14h Street
Rifle, CO 81650
Phone 970625-5200 x81 1 3
Cell 970-319-1579
Fax 970€25€304
Email jr"@
Web www.garfield-county.com
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A5/23/2827 84:55 62iB6Z7
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PAGE 03
05/23/2487 84:55
I
6258627 ROAD AND BRIDGE
BorrrH( Forx loHlErvAHcv
Exmutive Director
Fosr OrrlcE Box ,1q9 | E*t,r'-r, Cot.oRrpo Etorr
g7o lgt1.-nga r . g7o I gt7-tt6q FAx . E-MAIL: inlodrouingfotk,org
www.roaringfork,org
PAGE A2
,nrugust 30,2005
David A, loaeph
LE Rose Rarrh, LLC
1007\AreetBarrk Road
Ctertwood Springs, CO 8160f
Dear David,
The-Roarlrrg Fork Conocr{rncy ir diaplerred with end did not recomrnend or
.urriura th* *'ecetrt vegetetion i{rinot'El te thc crxtttlt that ttras coru{uetd otong
the Rorrlng Fork Rlver et Ircn Brldgc. In Stc intHrl pharcs of whrt wat t0 be a
selective cuttingof invativ: Ruuiarrolive, rrewBtG csrtacted by lron Eridg_e,by
phone. We mrdl Eorne verbrl recommrndatiotu, but we were never imtEd lor
i totlrnet site vitit end rrcomtntrtdaticrre. Fotlowing the phre clll, we wtlt
eonfident htt Iron Bridgn weo working cloaety wtth Garfield Comty vegEtation
manrg?mcnt while temoving invufvc Rrr*ien'olive, In sub*quent weolu-
fotlmving the initiei refirovd of invdsive Rrrrcian+hv€, coPiou3 amowrtr of
native silver brtrffel,o berry rnd nrtlve nrrrowlmf eottonwood (live treer end
utanding deed snags) were rerrorred dong tlre rivcr bank. Tfu rcsult ia.e
temeni'otre lor oltraUitet fq riildlife cudr es bald eaglet, and the Iom qI
bemcficial ehade created by the cenopy criticd to cold wattf rquatic keltn errd a
tluiving trout populrtton. Although, s*notd prior, we have ng legd r€courue
to prottiUit Ere cti,aring of, rutive veg:trtion, we bdtwt lt ig ln fie beat lnteneut of
Iron Bridgs to preserye as much native habitet aD Poeoiblc.
We appteciate your att€nHon to scve*rl eornplatne releted to removal of a lrrge
pile oI grasr clippings along the Rorrin6 Fork, and turrrncrrd you o1 t!
-yern+rel *f invigivr 1.'egPjrtion, The Cangen'en-rlnrrrruld IiLe r.o wot* with- )T ttr
t6 avoid eny further rcmoval d nativc vegetltion rlong the nver ii Incn Bfidge.
Therefor€, rrru offcr our ecologicrl setrrlces frce oI chir6€ it efiy time they are
n:ded. Flee+ do not hesitrtc to cell on uc Ior rny futulc ecologlcal congultation
rcgarding nstive vegetrtion,
85/23/2097 04:55 6258527
,t
ROAD AND BR]DGE PAGE Z4
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rlvr Dr1k r*l rltnintEd ffir Er !h*,s &tllhg firh. We only emorcd Russbn Olh,l dfffi rt he
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nanr htrtl r fiirg ftorn either agrey. I h$,r urk;d an thc Rfimg Fort Vdhy rnd Ergc County for
mrny lclfit mr rnd ft"tlly urulrffind thr !.nrlrw rlitrne d hh type of vrprk. ThEl hr utry rc lrMtH
thc DOI/V aml tha Corumtnrrcy b tE $ts fot mk eorlmfill ft wor,rlrl hrvc drdly tekcn htu
cmridrrrlfrrn fiy of thck reqr.Ett6. We uoird prurposd t tnEiiing rrulth the Cut*rtutey, flil DOW,ild hB mutty b H hdd on{tt E vltuv tm aIftr$tg ttfi $c fi tio aifi't Goms to ssne rwdutirrn of
thh terw, I wurrd t*Etooma yur [prrEhtr on dir mtmr. ygu mry rrrcn mr at (719)2a&Ec3g,
Olu {Hn, mat* yu rr iour tme rcgr{|ry hlr lrrw.
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LBRo]. R.fffi,LLC
STATE OF COLOTUDO
Bill Ritter, Jr,, Governor
James B, Martin, Executiv€ Director
Dedicateclito protecting and improving the health and environment of the people of Colorado
4300 Cherry Creet< Or. S. t"Uor"tory Services Division
Denver, Colorado 80246-1530 8100 Lowry Blvd.
Phone(303)692.2000 Denver,Colorado80230-6928
TDD Line (303) 691-200 (303) 692-3090
Loeated in Glendale, Colorado
http/Avww.cdphestate.c!. us
May 4,2407
Mr. David Joseph, Director of Development
LB Rose Ranch, LLC
410 Ironbridge Drive
Glenwood Springs, CO 81601
Re: Site Application and Design Approval #4921
Garfield County
Dear Mr. Joseph:
ColoradoDepar,tment
ofl\rblicHsldr
andlnvironment
2.
3.
RECEIVED
[rAy I 4 2007
,',f-Tit?ff,Y^il#
The Water Quality Control Division has reviewed and evaluated your site application and
supporting documentation for a lift station (lift station #2) located in the SW % of SE % of
Section 1, Township 7 South, Range 89 West serving the Ironbridge PUD and discharging to
Prngatory Metropolitan District Wastewater Treatment Facility.
We find your application to be generally in conformance with the Water Quality Control
Commission's "Site Location and Design Approval Regulations for Domestic Wastewater
Treatment Works." Therefore, the site application is conditionally approved with the following
conditions listed below.
l. Based upon application information, the WWTF design will be for:
Hydraulic Design Capacity -72,000 gpd (maximum monthly average)
Peak Hydraulic Capacity - 108,000 gpd
Organic capacity - lg2lbs. BOD5/day
Treatment processes to be used - Lift station and force main
The design (construction plans and specifications) for the treatment works is
approved concurrently with this site location approval. The Division must approve
all construction change orders initiating variances from the approved plans and
specifications.
The applicant's registered engineer must furnish a statement prior to the
commencement of operation stating that the facilities were constructed in
conformance with approved plans, specifications, and change orders.
LB Rose Ranch, LLC
sA# 4921
Page2 of2
4. This site location approval will expire one year from the date of this letter if
constuction of the project has not cofirmenced by that date. If constnrction will not
corlmence on or before the expiration date, you must request a time extension prior
to the expiration date. If you do not request the extension prior to the expiration date,
then you must reapply. Construction is defined as entering into a contract for the
erection or physical placement of materials, equipment, piping, earthworlg or
buildings that are to be part of a domestic wastewater treaffient works.
The conditions of approval, including construction of facilities with capacities in excess ofthe
above limitations, are enforceable by the Division. The Division may bring an enforcement
action including the assessment of penalties if these conditions are not met.
In accordance with Colorado Water quafity Contol Commission regulations, this approval is
subject to appeal as stated under Section 22.3 (15) of "Site Application and Design Approval
Regulations for Domestic Wastewater Treafirent Works'.
This approval does not relieve the owner from compliance with all Federal, State, or local
regulations prior to construction nor from responsibility for proper engineering, consfiuction, and
operation of the facility.
Attached to this letter you will frnd a Customer Satisfaction Survey. We would greatly
appreciate it if you would take a few moments to complete this survey and retum it to us.
Simply fill out the fomt, fold it according to the directions and drop it in the mail. The postage is
already paid! Thank you for your time.
Sincerely,
q)-, ,Jafuru/,Y7
David Akers
Clean Water Facilities Program Manager
Water Quality Contol Division
DA:rkk
Enclosure
Dirk Gosda" P.8,, High County Engineering, Inc., 1517 Blake Avenue, Suite l0l, Glenwood
Springs, CO 81601, dsurvey
Garfield County
Andrew Ross, Unit Manager, Permits Section
Mmk Kadnuclg Disfrict Engineer, WQCD
Kent Kuster, Environmental Protection Specialist, WQCD