HomeMy WebLinkAboutTalbot-Paccar Geotech MemoMemorandum to PSE
January 19, 2018
Page 2
SITE CONDITIONS
Surface Conditions
We performed a site reconnaissance at and near the existing utility corridor on December 20, 2016 with a
PSE construction manager to discuss the access for the poles for replacement and reframing. The project is
located predominately within urbanized portions of the City of Renton, which consists of commercial and retail
development as well as high density residential development. The corridor runs parallel to and crosses
Interstate-405 (I-405) and State Route (SR) 169; and it crosses the Cedar River as shown in Figure 1
As part of the site reconnaissance, GeoEngineers looked for indications of active or recent unstable slopes or
erosion in or adjacent to the project corridor. We observed no indications of active or recent unstable slopes
or erosion in or adjacent to the project corridor except for areas upslope of Pole 1/19. Pole 1/19 is not
located within a regulated geohazard, but at the toe of the slope within the SR 169 ROW; as such it is not
included as one of the poles identified for review in this report. However, it was deemed worth noting that the
localized evidence of soil movement upslope of the pole did not extend downslope and impact Pole 1/19 or
the proposed reframing work. Therefore, the reframing activities are not expected to impact the stability of the
adjacent slope; Pole 1/19 was excluded from further analysis.
Poles 1/6, 1/7, 1/8 and 1/9 are located in a fully developed residential area that is mapped within a Medium
Landslide Hazard. We observed no indication of slope movement or landslide activity during our
reconnaissance. In our opinion the risk is very low and no mitigation is required for these poles, therefore we
do not discuss them further in this report.
GeoEngineers also observed that Pole 2/2 is located along a gravel-surfaced walkway downslope of a
protected slope (constructed fill embankment) and is not considered at risk to impact the geologic hazard
upslope because the pole replacement access will be from a paved area adjacent to the pole that includes
the I-405 ROW. This pole has also been removed from further discussion.
General Geology
We reviewed the 1:100,000-scale Geologic map of King County compiled by the Washington Pacific
Northwest Center for Geologic Mapping Studies (Booth, D.B. and Wisher, A.P. 2006) and the Washington
State Department of Natural Resources (DNR) Division of Geology and Earth Resources 1:100,000-Scale
Digital Geology of Washington State (100K quads covering Puget Sound Basin). The project generally crosses
glacial and alluvial deposits with localized areas characterized as modified fill soils and Renton Formation
Sandstone bedrock. The portion of the project corridor located in regulated geohazard areas consists of
geologic units that are typically stable within a built/engineered environment. The mapped geologic unit is
provided in Table 1 following identified mapped slope hazards for reference with respect to the mapped
deposit or bedrock unit present.
Aerial Photograph Review
We reviewed aerial photographs available on Google Earth for the years 1990, 2005, 2006, 2009, 2011,
2013, 2014, 2015 and 2016. We also reviewed 1936 aerial photographs available on the King County map
viewer (2017).
Memorandum to PSE
January 19, 2018
Page 3
Geologic Hazard Review
Table 1 provides a summary of the geohazard review completed on the remaining 15 poles (nine pole
replacements and six reframe poles), by pole location. Selected maps identified in the Figure 2 Index Map are
provided for site specific areas relative to site access and recommendations in Figures 3.1 through 6.2. Also,
there are no mapped landslide or erosion hazard areas in the vicinity of poles 1/2, 1/3 or 1/4, therefore no
landslide hazard and erosion figure is provided of that area.
CONCLUSIONS AND RECOMMENDATIONS
In general, we observed no active areas of landsliding, slope movement or erosion in the areas of proposed
replacement or reframing of the poles. The general recommendations below are provided relative to
construction and site access of the poles. Site specific recommendations for pole replacement and reframing
are summarized in Table 1.
General Recommendations
The work may involve brushing, trimming and potential removal of small shrubs. PSE Standard Best
Management Practices (BMPs) are sufficient for pole replacement at most locations. The pole locations can
be accessed from existing site access; the majority of which access consists of paved or otherwise improved
areas. Only two localized areas will require the re-establishment of construction access using a gravel overlay.
We recommend avoiding cuts into the hillslope upslope of the poles and that the work only be completed
during the dry season. Soils removed from the new pole excavation should be removed from the site and
disposed of at an off-site disposal facility or in a stable location. Site specific pole recommendations area
provided within the comment column of Table 1. In our opinion, the proposed pole improvements will not
increase the threat of mapped geologic hazards to adjacent properties beyond pre-development conditions. It
is also our opinion that the proposal will not adversely impact other critical areas and can be safely
accommodated at the sites.
Code Review
Per RMC 4-3-050C(d), in determining whether to issue a letter of exemption, the Administrator shall find that:
1. The proposal will not increase the threat of the geologic hazard to adjacent or abutting properties beyond
pre-development conditions;
Response: The proposal will not increase the threat of the geologic hazard to adjacent of abutting
properties beyond pre-development conditions. PSE is proposing to replace existing poles in the same
general location within an existing transmission line ROW. Construction methods and recommended
BMPs will reduce potential impacts to geologic hazard areas. Access to poles in most cases is already in
place and site-specific recommendations are provided for selected poles without impacting mapped
geologic hazards (see Table 1).
2. The proposal will not adversely impact other critical areas; and
Response: The proposal will not adversely impact other critical areas. Poles will be replaced in the same
general location as the existing poles. Access will be from existing ROW and access routes, except for
Poles 1/11 and 1/12. Crushed rock will be installed to stabilize the construction entrance.
Memorandum to PSE
January 19, 2018
Page 4
3. The development can be safely accommodated on the site.
Response: Based on our assessment of the proposal, the pole replacement and reframing can be safely
accommodated as proposed provided the contractor follows the recommendations in this report and
completes the construction during the dry season when working on sensitive or protected slopes.
LIMITATIONS
We have prepared this report for the exclusive use of Puget Sound Energy and their authorized agents for the
Talbot-Paccar 115 kV Re-conductor Project located in Renton, Washington. This information is based on a
desktop study and site visit for the project.
The purpose of our services was to review published data and perform a site reconnaissance as a basis for
developing an opinion regarding the presence of geologic hazards. Within the limitations of scope, schedule
and budget, our services have been executed in accordance with accepted practices in the field of
geotechnical engineering in this area at the time this report was prepared. No warranty or other conditions,
express or implied, should be understood.
The applicant is advised to contact all appropriate regulatory agencies (local, state and federal) prior to
design or construction of any development to obtain necessary permits and approvals.
REFERENCES
Booth, D.B., and Wisher, A. P., compilers, Geologic map of King County, Washington Pacific Northwest Center
for Geologic Mapping Studies: scale 1:100,000, 2006. Available at
http://geomapnw.ess.washington.edu/services/publications/map/data/KingCo_composite.pdf )
City of Renton, Critical Areas Regulations (Title IV Development Regulations, Chapter 3 Environmental
Regulations and Overlay Districts 4-3-050, 2017) (accessed on January 4, 2017.
Google Earth aerial photographs for years 1998, 2005, 2006, 2009, 2011, 2013 accessed on January 1,
2017.
King County, iMap Viewer with 1936 aerial photographs, http://gismaps.kingcounty.gov/iMap/?center=-
13603835%2C6019532&scale=2256.994353& accessed on February 1, 2017.
Attachments:
Table 1. Geologic Hazard Summary
Figure 1. Vicinity Map
Figure 2. Index Map
Figure 3.1. Steep Slopes
Figure 4.1. Steep Slopes
Figure 4.2. Landslide Hazards and Erosion
Figure 5.1. Steep Slopes
Figure 5.2. Landslide Hazards and Erosion
Figure 6.1. Steep Slopes
Figure 6.2. Landslide Hazards and Erosion
Erosion
Pole Type
Sensitive: 25
to 40
percent
Protected: >
40 percent Hazard Very High High Medium Comment
0/13 Reframe
Yes, Renton
Fm
sandstone
0/13 is located off Talbot Road South along a rocked
access east of Rolling Rock Creek and the Sam’s Club
Parking Area. We observed localized groundwater seepage
on the slope south of Pole 0/13 that is in part likely fed
by surface runoff from an I-405 mechanically stabilized
earth (MSE) wall upslope.
0/14 Reframe
Yes, Renton
Fm sandstone
0/14 is located off Talbot Road South along existing
rocked access east of Rolling Rock Creek and the Sam’s
Club Parking Area. Site includes WSDOT embankment
upslope and retaining wall downslope for the Rolling Rock
Creek.
0/16 Replace
Yes, Modified
land
0/16 is located west of the shoulder off Benson Road
South on the opposite side of the roadway from a
concrete barrier. The existing glue-laminate structure is
located on west-facing slopes west of the Benson Road
South embankment that is now largely vegetated with
grass and scattered confer trees.
1/2 Replace
Yes, Modified
land
1/2 is located east of Main Avenue South upslope of a
retaining wall and within an I 405 embankment. The
existing wood pole is located on west-facing slopes that
are vegetated with blackberries and scattered confer
trees. Access is proposed from Main Avenue South with a
likely northbound lane closure. PSE Standard BMPs are
sufficient for Pole 1/2 access and we recommend catch
basin BMP protection downslope of the pole. The
contractor should consider the use of a casing or a
caisson if needed to install the pole to the design
embedment depth for Pole 1/2.
1/3 Reframe
Yes, Modified
land
1/3 is located east of Main Avenue South upslope of a
retaining wall and within an I 405 embankment. The
existing wood pole is located on west-facing slopes that
are vegetated with blackberries and scattered confer
trees. Access is proposed from Main Avenue South with a
likely northbound lane closure. PSE Standard BMPs are
sufficient for Pole 1/3 access and we recommend catch
basin BMP protection downslope of the pole. The
contractor should consider the use of a casing or a
caisson if needed to install the pole to the design
embedment depth for Pole 1/3.
1/4 Replace
Yes, Modified
land
1/4 is located west of the I-405 southbound lane
shoulder. The existing wood poles are located on west-
facing slopes that are vegetated with blackberries and
scattered confer trees. Site is a constructed WSDOT
roadway embankment. Access is proposed from the
shoulder of WSDOT south bound I-405. Straw wattles
should be used on the downslope side of the pole location
to reduce impact to the I 405 fill embankments. We
recommend that the existing pole be cut near the ground
surface and the new pole installed at least 5 feet away to
reduce impacts to the protected slope adjacent to the
existing Pole 1/4. The contractor should consider the use
of a casing or a caisson if needed to install the pole to the
design embedment depth for Pole 1/4.
1/10 Replace Yes
1/10 is located off Renton Avenue South. The pole is
located on a gentle northwest-facing slope (less than 15
percent) east of Renton Avenue South and north of a
single family residential property for acces to poles 1/11
and 1/12 to the east. The rocked access will be left as
permanent access. We also recommend that the
contractor protect catch basin and manhole cover north
of Pole 1/10 along the Renton Avenue South roadway if
stormwater runoff flows toward them. Soil removed from
the new poles should be disposed of off-site at an
approved disposal facility or non-geohazard location.
Landslide HazardSteep Slope
Table 1
Geologic Hazard Summary
Talbot PACCAR 115 kV Rebuild Project
Renton, Washington
File No. 0186-722-02
Table 1 | January 19, 2018 1 of 3
Erosion
Pole Type
Sensitive: 25
to 40
percent
Protected: >
40 percent Hazard Very High High Medium Comment
Landslide HazardSteep Slope
1/11 Replace
Yes, Ice
Contact
Deposits Yes
1/11 is located off Renton Avenue South. The pole is
located on northwest-facing slopes east of Renton Avenue
South and north of a single family residential property.
Upgraded rocked access is proposed in the vicinity of Pole
1/11 as shown in Figure 4.1. The contractor will build a
rocked access approximately 16 feet wide to traverse the
steep part of the slope between the existing gravel access
west of Pole 1/11 and Pole 1/12. The access will be
constructed using approximately 18 inches of quarry
spalls with approximately 12 inches of 1-¼-inch crushed
rock. The rocked access will be left as permanent access.
The contractor will straw/seed/hydroseed adjacent
disturbed areas when finished.
1/12 Replace
Yes, Ice
Contact
Deposits
1/12 is located approximately 290 feet east and
downslope of Renton Avenue South. The pole is located
on northwest-facing slopes and south of the Cedar River
Trail. Upgraded rocked access is proposed for 1/12
access as shown in Figure 4.1. The contractor will build a
rocked access approximately 16 feet wide to traverse the
steep part of the slope south of the pole to pole 1/11 and
to the west. The access will be constructed using
approximately 18 inches of quarry spalls with
approximately 12 inches of 1-¼-inch crushed rock. The
rocked access will be left as permanent access. Straw
wattles should be placed around Pole 1/12 if conditions
warrant. The contractor will straw/seed/hydroseed
adjacent disturbed areas when finished.
1/20 Reframe
Yes, Pre-Fraser
deposits
1/20 is located mid-slope of a SR 169 highway cut slope
upslope of a retaining wall and pedestrian sidewalk
Access is planned from upslope as shown in Figure 5.1.
PSE Standard BMPs are proposed for access and
equipment staging for Pole 1/20 that will occur from the
top of the slope. The access extends into a nearby motel
parking lot area northwest of the access area shown in
Figure 5.1. PSE plans to have equipment reach down the
slope for reframing the pole and avoid closure of a
westbound lane of SR 169. We recommend catch basin
BMPs protection within the sidewalk gutters that are
downslope of Pole 1/20. The top of the slope where
access will occur is inclined at less than 20 percent. Tire-
mounted pole reframing equipment may be used at the
location provided it is completed during the dry season
when the site is dry.
1/21 Reframe
Yes, pre-Fraser
deposits yes
1/21 is located mid-slope of a SR 169 cut slope upslope
of pedestrian sidewalk. The pole is located on south-
facing slopes north of SR 169 that is largely vegetated
with blackberry and shrubs. Access is planned from
upslope as shown in Figure 5.1. PSE Standard BMPs are
proposed for access and equipment staging for Pole 1/21
that will occur from the top of the slope. These poles will
be reframed. The access extends into a nearby motel
parking lot area northwest of the access area shown in
Figure 5.1. PSE plans to have equipment reach down the
slope for reframing the pole and avoid closure of a
westbound lane of SR 169. We recommend catch basin
BMPs protection within the sidewalk gutters that are
downslope of Pole 1/21. The top of the slope where
access will occur is inclined at less than 20 percent. Tire-
mounted pole reframing equipment may be used at the
location provided it is completed during the dry season
when the site is dry.
2/1 Reframe
Yes, Modified
land
2/1 is west of the Sherry's Restaurant parking lot on a
shallow fill embankment less than 10 feet thick.
2/3 Replace
Yes,
Recessional
outwash
deposits
2/3 is located off paved access from an apartment
complex parking area along a gravel surface footpath. The
pole is located on west-facing slopes adjacent upslope of
the I-405 on-ramp. Access is planned from the apartment
complex parking area located at 1901 NE 3rd Street. PSE
Standard BMPs are sufficient for pole replacement at this
location. The contractor should be prepared to encounter
loose soils susceptible to caving below fill in native glacial
outwash soils near Pole 2/3. The contractor should
consider the use of a casing or a caisson if needed to
install the pole to the design embedment depth for Pole
2/3.
File No. 0186-722-02
Table 1 | January 19, 2018 2 of 3
Erosion
Pole Type
Sensitive: 25
to 40
percent
Protected: >
40 percent Hazard Very High High Medium Comment
Landslide HazardSteep Slope
2/4 Replace
Yes,
Recessional
outwash
deposits Yes
2/4 is located off paved access approximately 40 feet
east from Monterey Drive NE within a landscaped grassed
area for a residential development. The pole is located on
north-facing slopes that range from 10 to 25 percent. PSE
Standard BMPs are sufficient for pole replacement at this
location. The contractor should be prepared to encounter
loose soils susceptible to caving below fill in native glacial
outwash soils near Pole 2/4. The contractor should
consider the use of a casing or a caisson if needed to
install the pole to the design embedment depth for Pole
2/4.
2/5 Replace
Yes,
Recessional
outwash
deposits Yes Yes
2/5 is located off paved access approximately 15 feet
south of NE 3rd Street along the roadway cut slope. The
pole is located on north-facing slopes that range from 30
to 60 percent locally. The replacement will likely require
temporarily closing a lane of traffic along the four-lane
roadway. The contractor should be prepared to encounter
loose soils susceptible to caving in native glacial outwash
soils near Pole 2/5. The contractor should consider the
use of a casing or a caisson if needed to install the pole to
the design embedment depth for Pole 2/5.
File No. 0186-722-02
Table 1 | January 19, 2018 3 of 3
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SITE
Vicinity Map
Figure 1
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2,000 2,0000
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Data Source: Mapbox Open Street Map, 2016
Notes:1. The locations of all features shown are approximate.2. This drawing is for information purposes. It is intended to assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and content of electronic files. The master file is stored by GeoEngineers, Inc. and will serve as the official record of this communication.
Projection: NAD 1983 UTM Zone 10N
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Figure 2
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Notes:1. The locations of all features shown are approximate.2. This drawing is for information purposes. It is intended to assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and content of electronic files. The master file is stored by GeoEngineers, Inc. and will serve as the official record of this communication.
Projection: NAD 1983 StatePlane Washington North FIPS 4601 Feet
P:\0\0186722\GIS\MXD\018672202_F02_IndexMap.mxd Date Exported: 01/19/18 by glohrmeyer
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Figure 3.1
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!Reframe Pole
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>40% & <=90% (Protected)>90% (Protected)
Notes:1. The locations of all features shown are approximate.2. This drawing is for information purposes. It is intended to assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and content of electronic files. The master file is stored by GeoEngineers, Inc. and will serve as the official record of this communication.
Projection: NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet
P:\0\0186722\GIS\MXD\018672202_SteepSlopes.mxd Date Exported: 10/17/17 by glohrmeyer
Data Source: City of Renton
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Notes:1. The locations of all features shown are approximate.2. This drawing is for information purposes. It is intended to assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and content of electronic files. The master file is stored by GeoEngineers, Inc. and will serve as the official record of this communication.
Projection: NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet
P:\0\0186722\GIS\MXD\018672202_SteepSlopes.mxd Date Exported: 10/17/17 by glohrmeyer
Data Source: City of Renton
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Notes:1. The locations of all features shown are approximate.2. This drawing is for information purposes. It is intended to assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and content of electronic files. The master file is stored by GeoEngineers, Inc. and will serve as the official record of this communication.
Projection: NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet
P:\0\0186722\GIS\MXD\018672202_LandslideHazards_Erosion.mxd Date Exported: 01/19/18 by glohrmeyer
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Notes:1. The locations of all features shown are approximate.2. This drawing is for information purposes. It is intended to assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and content of electronic files. The master file is stored by GeoEngineers, Inc. and will serve as the official record of this communication.
Projection: NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet
P:\0\0186722\GIS\MXD\018672202_SteepSlopes.mxd Date Exported: 10/17/17 by glohrmeyer
Data Source: City of Renton
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Notes:1. The locations of all features shown are approximate.2. This drawing is for information purposes. It is intended to assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and content of electronic files. The master file is stored by GeoEngineers, Inc. and will serve as the official record of this communication.
Projection: NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet
P:\0\0186722\GIS\MXD\018672202_LandslideHazards_Erosion.mxd Date Exported: 01/19/18 by glohrmeyer
Data Source: City of Renton
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>40% & <=90% (Protected)>90% (Protected)
Notes:1. The locations of all features shown are approximate.2. This drawing is for information purposes. It is intended to assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and content of electronic files. The master file is stored by GeoEngineers, Inc. and will serve as the official record of this communication.
Projection: NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet
P:\0\0186722\GIS\MXD\018672202_SteepSlopes.mxd Date Exported: 10/17/17 by glohrmeyer
Data Source: City of Renton
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N/BI-405RampI-405 FWYCapriAveNENE 3rd St
Bronson Way NE
23022021019017016015012010090200180110807060200
190180170160
7060 6050140130702407060
Landslide Hazards and Erosion
Puget Sound EnergyTalbot-PACCAR 115 kV Re-conductorRenton, Washington
Figure 6.2
µ
50 0 50
Feet
!Replacement Pole
!Reframe Pole
115kV Re-conductor Alignment
10 Foot Contour
2 Foot Contour
Site Access
Erosion Hazard - HighLandslide Hazards
VERY HIGH
HIGH
MEDIUM
Notes:1. The locations of all features shown are approximate.2. This drawing is for information purposes. It is intended to assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and content of electronic files. The master file is stored by GeoEngineers, Inc. and will serve as the official record of this communication.
Projection: NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet
P:\0\0186722\GIS\MXD\018672202_LandslideHazards_Erosion.mxd Date Exported: 01/19/18 by glohrmeyer
Data Source: City of Renton
3.2
4.2
5.2
6.2