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Project Narrative for Geotechnical Borings and Fiber Optic Line Potholing for the Tabor-Crowall and Brodell Revetment Repair Project
The proposed geotechnical borings and fiber optic line potholing for Tabor-Crowall and Brodell Revetment Repair Project includes conducting exploratory geotechnical boring in three locations
and fiber optic line potholing in four locations on the south side of State Route (SR) 169, within the
road right-of-way (ROW), located within shoreline jurisdiction (Cedar River). The boring and
potholing are necessary for future revetment repair along the Cedar River and SR 169. Two future
revetment repairs are proposed along the Cedar River and are referred to as the “Tabor-Crowall”
site (near Riverview Park) and the “Brodell” site (southwest of the Maplewood Golf Course). See
attached site plan exhibits (Figure 1).
The Tabor-Crowall site is located in the southwest quarter of Section 16, Township 23 N, Range 05 E, W.M. The Brodell site is located in the northeast quarter of Section 21, Township 23 N, Range 05 E, W.M. The locations of the boring and potholing are shown on the attached site plans (Figures 2 and 3).
The project will be conducted as follows:
1. First, 811 one-call will be initiated at boring locations (total of three) and at utility potholing
locations (total of four). Applied Professional Services (APS) will, in parallel, perform private
utility locates at these locations, placing paint on the pavement and/or turf to mark utilities.
2. Next, APS will perform potholing of the fiber optic line in four locations, two at each revetment repair site. See attached site plan exhibits (Figures 1, 2, and 3) for the location of the potholes. Potholing will be accomplished by a vacuum mounted on the back of small pick-up truck and the hole is typically less than 8-inches wide. All excavated material will be replaced upon completion of work. The area will then be reseeded and restored to current conditions. Potholing will be conducted as follows:
a. Fiberoptic Utility pothole #1: located at Tabor-Crowall revetment, close to Boring location T2. APS will access location from the parking area of Riverside Park. Pedestrians will have access to the bridge over the river. Vehicles will have access to the parking lot, although one of the two lanes in/out will be closed for parking of equipment. See traffic control plan (TCP) 1 (Figure 4).
b. Fiberoptic Utility pothole #2: located at Tabor-Crowall revetment site, close to Boring location T1. APS will access the location by driving up and over the sidewalk onto the grassy area. Sidewalk closure will not be necessary.
c. Fiberoptic Utility pothole #3: located at the Brodell revetment site, next to the Cedar
River Trail. This work will be accomplished without closing the trail. Signage will warn
trail users to walk, or to walk their bikes next to equipment See TCP 2. Access will be via
access trail to the west. No tree removal or tree pruning will be necessary to accomplish
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this work. Light pruning of shrubs may be necessary between SR 169 and the Cedar River Trail to access this location, but no shrubs will be removed.
d. Fiberoptic Utility pothole #4: located at the Brodell revetment site next to the Cedar River Trail. This work will be accomplished without closing the trail. Signage will warn trail users to walk, or to walk their bikes next to equipment See TCP 2. Access will be via access trail to the west. No tree removal or tree pruning will be necessary to accomplish this work. Light pruning of shrubs may be necessary between SR 169 and the Cedar
River Trail to access this location, but no shrubs will be removed.
3. Lastly, the geotechnical borings will take place. Borings will be approximately 8 inches wide
and will be drilled from equipment mounted on the back of a small truck. All soil will be
stockpiled adjacent to the borehole and replaced upon completion of the work. The
exposed soil will then be reseeded and restored to current conditions. The boring work will
be conducted as follows:
a. T1, located near the Tabor-Crowall revetment: This boring location will be accessed by
bringing the truck/rig over the curb and sidewalk to that location. Geotechnical driller
Holocene will bring ‘mud mats’ to protect the turf. No closure of sidewalk, roadway, or
trail is required. A piezometer will be placed in this boring to monitor groundwater
levels. After borings are complete, the piezometer will be accessed via foot and cable
download.
b. T2, located near the Tabor-Crowall revetment: This boring location will be accessed via the Riverview Park parking lot. The boring location is in the mowed grassy area just to the east of the park entrance. Pedestrians will have access to the bridge over the river. Vehicles will have access to the parking lot, although one of the two lanes in/out will be closed for parking equipment. See the attached traffic control plan (TCP) 1 (Figure 4).
c. B1, located at the Brodell revetment: This boring is planned for the edge of the pavement of the Cedar River Trail. This work will be performed without closing the trail. Signage will be placed to warn trail users to walk or to walk their bikes next to equipment (see TCP 2, Figure 4). Access to this boring will be via the access trail to the west. A piezometer will be placed in this boring for monitoring groundwater levels. Access to this piezometer after the borings will be via foot and via cable download.
Figure 1. King County Tabor Revetment Repair Exhibit (Overview)
Figure 2. King County Tabor Revetment Repair Exhibit (Boring and Pothole Locations for
Tabor-Crowall Site)
Figure 3. King County Tabor Revetment Repair Exhibit (Boring and Pothole Locations for
Brodell Site)
Figure 4. Traffic Control Plans