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HYDROGEOLOGIC ANALYSIS OF NEW
GROUP B WELL
HYDROGEOLOGIC ASSESSMENT FOR SCOTT STANDLEY
30 NORTH SHAR LANE, LILLIWAUP, WA 98555
JEREMY J. BUSH, LG, LHG, REHS
s BUSH GEOLOGICAL CONSULTING, LLC
bushgeological@gmail.com
Bush Geological Consulting,LLC
Hydrogeologic Analysis
Lilliwaup,Washington
February 20,2026
Table of Contents
INTRODUCTION/BACKGROUND 2
PURPOSE AND SCOPE 2
REGIONAL HYDROGEOLOGIC SETTING 2
Study area 2
Topography and Location 2
Geologic Stratigraphy 2
Hydrogeologic Data 4
WELL VARIANCE AND CONSTRUCTION 4
Department of Ecology Approved Variance 4
Subject Well Construction 4
HYDROGEOLOGIC ANALYSIS 4
CONCLUSIONS 5
CLOSURE 5
Appendix A 6
Appendix B 11
Appendix C 14
•
Bush Geological Consulting,LLC
Hydrogeologic Analysis
Lilliwaup,Washington
February 20,2026
Introduction/Background
A new well was constructed at 30 North Shar Lane in Lilliwaup, WA by Arcadia Well Drilling. The well
location was within close proximity to an existing drainfield on the neighboring property, which was
approximately 55-feet up-gradient. The well driller consulted with the Washington State Department of
Ecology on a setback reduction,which was approved with alternative construction standards as mitigation
for the reduction in siting of the well to a known contaminant source.
The property owner, Scott Standley, is wanting to utilize this as a Group B well in order to serve his
property,and the nearby property located at 180 North Shar Lane. In order to accomplish this,the County
is requiring a waiver and setback reduction to the adjacent septic drainfield.
Purpose and Scope
Bush Geological Consulting was requested to conduct hydrogeologic review of the existing conditions,the
construction of the well, and potential impacts of the close proximity of the up-gradient drainfield from
the Group B well. A review of existing records for the well, any available nearby driller's well logs, and
literature review was conducted to determine the potential impacts of the setback reduction on the well.
Regional Hydrogeologic Setting
g
Study area x
The study area covers the subject property,the adjacent
property to the north, and the general geology of the ;
area where the subject property is located (Figure 1).
Topography and Location
The subject property is located on the western side of
the Hood Canal approximately 1.5 miles north of - E
Lilliwaup in Mason County, Washington (Figure 1). The
subject property is 0.6 acres in size,however most of the
property slopes steeply from the north to south. The /71/.,
property elevation ranges from the highest point on the
north side of the lot of approximately 110-feet above
sea level,to the lowest elevation of about 50-feet on the
southernmost portion of the property.
Surface geology and the topography of this area were au
shaped by several periods of glaciation, landslides, and
Figure 1 Site Location in Blue
erosion. The driller's well log indicates the well was
drilled at an elevation of approximately 100-feet above
mean sea level.
Geologic Stratigraphy
The geologic formations exposed in the study area consist of unconsolidated Quaternary sediments.These
sediments were deposited during the course of repeated cycles of glacial and interglacial processes. It is
Bush Geological Consulting,LLC
Hydrogeologic Analysis
Lilliwaup,Washington
February 20,2026
generally accepted that four or more glaciations have occurred in the Puget Sound lowland during the
Pleistocene.The most recent advance of the Puget glacial lob into the southern end of the Puget Sound
occurred approximately 13,500 to 15,000 years ago and is called the Vashon Stade of the Fraser Glaciation.
Prior to this,Cordilleran and Olympic glaciers shaped much of the region.
The Washington State Department of Natural Resources (DNR) has completed a geologic map of the
subject property, and shows that the ,, ; ro " -/ , ~-x� ' `� " 49 ` U
property has two geologic units likely ,'',''',.\ ," '' , „,..:7--,--,,,,',,,," ,/ <,. 11Ex/
present on the property —Qgic and Qpd " • ,• ../ —/./0.4,7
(Figure 2). ;Zi v."• 'a `° //"' Qg �/p�i ', '; -,/,';9-`1,-- 1 /..t ;( - ,
k V6
Qgic — as mapped on a portion of the ,1„.. ,, `R1 b`.X s 0_ 4
property, and the property to the < � ' g ' {
north/northwest—are Vashon Ice Contact k", • °„� r r „ , 1.\\11.,,,i,,,--,-� ' �4,
Deposits.The DNR indicates this material '° � \i� f 't.C, r `'
could be any of the following: Cobbly .,,,,t-,\-1,:.\'''.1 . ,• ;° i1 , ;'
\sz
pebble gravel, diamicton, silty sandy till ,'i A . i d
1). ' ) -'7
(between flutes on upland surface), silty ,b ,,,.\.,;.,.\,, 4 w ,¢`r ./ ,
pebbly gravel, and pebbly sand, with "_� ., �_
lesser sand and silt; yellow-tan to gray; : :� ., '-'4'f.-1)); .i7 ' , 4/`
clasts subangular to rounded; loose to 1.I O' l ;) t �
s�
very dense; variably sorted; massive to ,' / i , 4I:, ; `I3 '',-
i i' lat t 1 f2;<` CJs
well stratified; formed in the presence of ;Figure 2-Geologic Mapping of the site,showing Qpd as the primary
meltwater alongside, in, on, or above ice. geologic unit present. .,,,•„
Qpd - Pre-Fraser northern-source glacial drift —outwash and till. This is mapped on the majority of the
property.This is often directly overlain by Vashon deposits.This unit typically consists of gravel,sand,till,
and diamicton.
Deposits of earlier glaciations and interglacial periods are most important to the hydrogeology of deeper
systems.
e A geologic cross section (Figure 3) was also
` I o, I included in the DNR geologic mapping very near
091
logo n9�; the site,and can be referenced in comparison to
a
ag
local well logs for accuracy. This vertical
opu ' s, 00. interpretation is consistent with the various
?' ---?--_ r.r.." glacial and interglacial events throughout the
Pleistocene. The typical geologic profile of the
'l' subject site includes the Qgic unit overlying the
Qpd, with the underlying Qapo — an outwash
deposit lying underneath this till layer, and the
, .. ........... .......,._�_....__,, , ) aquifer 3-Geologic Cross Section just to the South of the Subject likely q uifer source underlying the site.
Property.
Bush Geological Consulting,LLC
Hydrogeologic Analysis
Lilliwaup,Washington
February 20,2026
Hydrogeologic Data
A review of nearby water well logs (driller's logs) was conducted to determine typical well construction
depths,and the geology encountered. Four well logs within close proximity, including the new well drilled
on site,were reviewed and shown in Figure 4.
The three wells located to the north all show similar geologic conditions —with confined aquifers found
between 180-200 feet below land surface. Each well shows artesian pressure with static water levels being
found significantly higher than the encountered water-bearing unit.This indicates that the aquifer is under
confined conditions, which create a positive pressure head shown in the static water levels being above
the top of the geologic unit. The well to the south =S 0:
(BAH895) also shows this, but is much shallower in 4 "
depth, likely due to elevation and proximity to a surface
water source and channel.
= .sora9
Based on review of the neighboring well logs, it appears
there is one primary aquifer being utilized in close
proximity to the subject site that is confined, and well
protected from surface contamination by its depth and
low-permeable geologic formations overlying it.
Well Variance and Construction
Department of Ecology Approved Variance
The Washington State Department of Ecology issued a ,aAties5
variance approval to WAC 173-160-171(3)(b)(iv) on Figure 4-Well Log Locations.Figure from
August 7, 2025. This variance was granted due to Department of Ecology.
limitations on the property to adequately site a well meeting setbacks to the existing drainfield. This
variance was approved pending the successful installation of a 30-foot or deeper surface seal—an increase
from the standard 18-foot surface seal.This variance and mitigation indicates the State has approved the
reduced setback to the existing drainfield providing their conditions were met.
Subject Well Construction
The subject well was drilled by Arcadia Drilling, out of Shelton, WA. Well drilling began on October 22,
2025, and concluded on October 23, 2025. The well was constructed with a 34-foot surface seal, and
drilled to a total depth of 190-feet below land surface.A screen was installed from 192.5-197.5 feet below
land surface.
Hydrogeologic Analysis
Based upon the stratigraphy and geologic units shown in the well logs for the subject and neighboring
wells, there is at least one significant aquifer being utilized in the immediate vicinity under confined
conditions. Positive head pressure in all wells show that artesian conditions are present, which indicates
the presence of a confining layer above the aquifer. Fine-grained sediments above this aquifer should
preclude most vertical migration of groundwater and contaminants,as they will likely flow down gradient
away from the source.Any shallow groundwater or septic effluent should reach confining units and travel
Bush Geological Consulting,LLC
Hydrogeologic Analysis
Lilliwaup,Washington
February 20,2026
laterally downslope towards surface water. Based on the geology alone, the significant depth of the
aquifer beneath the site will preclude any impacts from the setback reduction to the existing drainfield.
Conclusions
A thorough hydrogeologic analysis was conducted in order to determine any potential impacts to the well
from the reduced setback to the upgradient septic drainfield. Based on the review of available records for
the new and existing wells in the area, geologic interpretation,the approved setback variance from the
Department of Ecology, and the increased depth of the surface seal as a mitigation factor, there should
be no negative impacts to the water resource or Public Health from the use of this well as a Group B water
source. The geology encountered, the presence of a confined aquifer, and the increased surface seal
depth offer equal-to-or-greater protection of environmental health.
No additional mitigation should be required, however, ongoing monitoring of drinking water for Bacteria
and Nitrates should show if any failing septic systems are impacting the water resource.
Closure
The statements, conclusions, and recommendations provided in this report are to be exclusively used
within the context of this document. They are based on generally accepted hydrogeologic and
environmental practices and are the result of analysis by Bush Geological Consulting,LLC staff.This report,
and any attachments to it,is for the exclusive use of our client. Unless specifically stated in the document,
no warranty, expressed or implied, is made.
Respectfully submitted,
Bush Geological Consulting,LLC
Wash//i
onydr•ceoi gist
O�
o�Sed Ge°�
Jeremy Bush
2/20/2026
Jeremy J. Bush, LG,LHG, REHS
Principal Hydrogeologist
Bush Geological Consulting, LLC
Bush Geological Consulting,LLC
Hydrogeologic Analysis
Lilliwaup,Washington
February 20,2026
Appendix A
Bush Geological Consulting,LLC
Hydrogeologic Analysis
Lilliwaup,Washington
February 20,2026
Subject Well—BQC129—Scott Standley Well
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Bush Geological Consulting,LLC
Hydrogeologic Analysis
Lilliwaup,Washington
February 20,2026
Well Log AFB588
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Bush Geological Consulting,LLC
Hydrogeologic Analysis
Lilliwaup,Washington
February 20,2026
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Bush Geological Consulting,LLC
Hydrogeologic Analysis
Lilliwaup,Washington
February 20,2026
Well Log BAH895
01 WATER.WELL REPORT CURRF.,1f
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Bush Geological Consulting,LLC
Hydrogeologic Analysis
Lilliwaup,Washington
February 20,2026
Appendix B
Bush Geological Consulting,LLC
Hydrogeologic Analysis
Lilliwaup,Washington
February 20,2026
STATE OF WASHINGTON
DEPARTMENT OF ECOLOGY
Southwest Region Office
PO Box 47775,Olympia,WA 98504-7775•360-407-6300
August 7,2025
Scott Standley
cdo Jason Zack
General Manager
Arcadia Drilling Inc
21 W Westfield Ct
Shelton,WA 98584
RE: Variance request from Washington Administrative Code(WAC)173-160-171.The property address
is 30 North Sher Lane in Lilliwaup,in the NE Y. NW Xs of Section 16,Township 23 North,Range 03
West,W.M.,on Tax Parcel 32316-50-00001 in Mason County.
The Department of Ecology (Ecology) received your variance request via email on August 4,2025.The request
states strict compliance with WAC 173-160-171(3)(b)(iv), which details siting standards for water wells, is
impractical because access limitations by utilities and topography.You propose improved sealing methods(to 30
feet or deeper)which is beyond the minimum standards specified in WAC 173-160-241(2)(a).
This letter documents the variance you requested to WAC 173-160-171(3)(b)(iv) is granted in accordance with
WAC 173-160-106.The variance.expires August 7,2026,and is granted only for construction of the water well in
the manner and location referenced in the variance request.The intent of this variance is to prevent contamination
of the groundwater resource from constructing a well within a setback.This variance is not intended to protect
someone from drinking contaminated water.Seek advice from your local department of public health for guidance
in determining the water is safe prior to consumption.Any licensed water well!driller can execute the construction
of the well according to the variance request,subject to the provisions listed below:
1. A'"Notice of Intent"and fees shall be submitted to Ecology at PO Box 47611,Olympia,WA,98504-7611.
2. All other minimum construction standards found in WAC 173-160 shall be followed to prevent degradation
of the groundwater resource.
3. A well report containing the details required by WAC 173-160 shall be submitted to Ecology at PO Box
330316,Shoreline,WA 98133, within 30 days of completion of work on the well.Attach a copy of this
variance to the well report.
4. With the exception of the specific provisions set forth(above)in this variance,all federal,state,and local
requirements shall apply,
Bush Geological Consulting,LLC
Hydrogeologic Analysis
Lilliwaup,Washington
February 20,2026
Scott Standley August 7,2025
c/o Arcadia Drilling
Variance Response Letter
Your attention to these laws and regulations,and cooperation with the Department of Ecology in this matter, is
appreciated.Please telephone Garrett Scheuerman at(564)233-8151 or email him at gash461t ecy.wa.ttov if you
have any questions concerning this variance.
DATED this 7a day of August,2025,at Lacey,Washington.
Sincerely,
Garrett.).Scheuerman,LG
SWRO.Well.Construction Coordinator
Water Resources Program
Washington State Department of Ecology
Southwest Regional Office(SWRO)
(564)233-8151
aash461 Pecv.wa.aov
Bush Geological Consulting,LLC
Hydrogeologic Analysis
Lilliwaup,Washington
February 20,2026
Appendix C
Bush Geological Consulting,LLC
Hydrogeologic Analysis
Lilliwaup,Washington
February 20,2026
Sources:
Contreras,T. A., Paulin, G. L., Czajkowski,J. L., Polenz, Michael, Logan, R. L.,Carson, R.J., Mahan,S.A.,
Walsh,T.J.,Johnson, C. N.,and Skov, R. H., 2010,Geologic map of the Lilliwaup 7.5-minute quadrangle,
Mason County,Washington:Washington Division of Geology and Earth Resources Open File Report
2010-4, 1 sheet,scale 1:24,000.
Mason County Public GIS- https://gis.masoncountywa.gov/
Washington State Department of Ecology Well Log Search - https://ecologV.wa.gov/water-
shorelines/water-supply/wells