Hydrogeologic Report.,
'~"'
t
1~f',lJrizary ~~, ~0~~
Pacific Frontier, I LC
111 nth Street 1~lortheast
.Auburn, Washington ~~002
Attention.: Jack Long
Subject: Letter
IIydrogeologic Assessment
~'rystal Springs Pz-c~ject
helm, Washington
File No. 1 ~~54-001-01
~ °t"1
~C~P~ ®F ~~t~VlC~S
The intent of our study is to provide an assessment of the hydrogeologic conditions at the crystal Springs
project site azad immediate vicinity, specifically the potential presence of high ~ oundwater hazard areas.
T1ze sez-vices we provided included:
lA P~evie~Ting pity of Yelzaa critical Areas Ordinances (chapter 14~, publicly available critical
areas maps, site plans and othez~ information you and Petra ~ngineerh~g, LLB forwarded to
usA
2e ~onduethzg a pz•eliminary site visit to observe existing surface topo~ aphy and. bydrogeologic
conditions_
PaeiEc Frontier, LLG
Febr~aazy l9, 2007
Page 2
I F F2 TI VII=
GeaEngineers reviewed readily available izafa~-nzat~ian pertaining to the hydragealogy iza tlae Yelnz area,
I~acuzrzents we reviewed included:
We also reviewed a geateclznical repot-t far the ~'rystal Springs sate prepared by Gary t~.a Flowers, PLL~,
dated August 4, 200,. C)ther inforatian collected and reviewed included Wasingtan L?epartznent of
l~calogy (Ecalagy) Water Well 12eparts frarzz Ecalagy's Well Lag ~Tiewer website and United States
Gealagieal Survey (USGS} tapagraphic Hasps,
~ITI* ®1=Sf~l~ll~~'i®N
Accoz-ding to Federal Etncrgency ivlazlagez~~ent Agency (FEA} naps, tl~e 100-year base flaod elevatian
at the site is appra>~iz~ately 330 feet MSL along ~eln~ creek. Tile 330-feat MSL centaur transects the
site parallel to azad appraxixrzately 1001~arazantal feet trazza the ~elz~ Greek chana~zeh Tlae ] 00-year base
Pood elevatian contour is else shown an Figure 2.
rate ~~. tsss~ rtr~t-ttt taeo~zru~~s
Pacific Froxztier, I~f,C
Eebt~.tary 19, 2007
Page 4
IBC Sl
The proposed Crystal pz~ing site plan calls for the placement of several feel: of fill on the site to raise the
overall ground surface C to 7 feet wathixa the built area of the sate. The X11 will result in a ground surface
at Elevation '~3fi to 3~0 feet 1v1SU. Because no i.z~hliration of storzzawater oz• septic is proposed for the
development, raising of the ground surface should provide protection front the high groundwater hazard
dcscrzbed abovee
~.,
~eoEngineers reviewed readily available hydrogeologic information, applicable development regulations
related io high groundwater hazard areas, azad conducted an on-site investigation of the shallow
groundwater. ~~%e conclude that;
~ The shallow groundwater observed at the site appears to be localized perched water not directly
connected to the regional water-supply aquifers an the vicinity.
~ The ponded water is a result of the accumulation of local runofT of rain avid snowmelt in a
flacaPi~ed tapagxaphic depression unclerflain flay flag-penneabiflity saifl. 'T'his paraded water is ~aat a
result of Yelzn Creep flooding.
I'r e~3~a. 7.~~554 ~1t?I-f11 ~aE£?~F2~INEERS
Pacific Frontier, Lf,~
Feruaz°y ~ 4, 2007
~~~~
1?lacemeazt of fill to raise the overall ground surface to l~levatioaa 336 to 3~0 feet MSI, should provide
adequate protection from the potential. High groundwater hazard.
~ !T TI
~e have prepared this letter for the exclusive use of the Pacific hrontier, Lf,C and their authoa-ized agea~ts
for the I~ydrogeologic Assessment for the iCa~stal Spa~ings project in Yelan, ~ir'ashington.
~%ithin the limitations of scope, schedule aazd Laudget, our services have been. executed iaa accordance with
generally accepted practices in the field of geotechnical engizzeeriaag in this area at the time dais repoa~t seas
prepared. No warranty or other conditions, express or implied, should Lae understood.
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Notes:
'~ 1. The iodations of a(I features shown are approximate.
2. This drawing is for information purposes. It is intended to assist in
showing £eatures discussed in an attached document. GeaEngineers, Inc.
~ can not guarantee the accuracy and eantent of electronic files. The master
i file is stored by GeoEngineers, Inc. and will serve as the official record of
this oommunication.
= 3. It is uniawrful to copy or reproduce all or any part thereof, whether for
personal use or resale, without permission.
~ Rata Saurces: ESRI Data & Maps, Street Maps 20Qa.
~ Interstates, state routes, and roads from TIGER 20QQ.
~ County boundaries, c'sties, and waterbodies from Department of Ecology.
.:~ Lambert Conformal Ganie, Vt?ashingYOn State Plane til orth, NaRh Ameacan Datum 1983
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rysta! springs Planned Residential DevelQpl~ent
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