Franklin Creek - Exposed Sewer Line Stabilization Project
Summary
SCH Number
2024090488
Public Agency
City of Paso Robles
Document Title
Franklin Creek - Exposed Sewer Line Stabilization Project
Document Type
NOE - Notice of Exemption
Received
Posted
9/13/2024
Document Description
This project is to prevent further erosion of an exposed 21-inch diameter trunk sewer line. The sewer line is exposed where it crosses Franklin Creek, an intermittent tributary to the Salinas River. Franklin Creek is a seasonal creek that conveys stormwater in a southeast to northwest direction through oak woodland and non-native grassland habitat. The sewer line is in a location that is at risk of continued bed and bank erosion and is vulnerable to failure pending the 2024-2025 rainy season. Potential sewer line failure is a public health and safety risk due to its location within a creek that is tributary to the Salinas River, its proximity to Pat Butler Elementary School (school yard is located 100 feet south), and adjacent multi-family residences.
The Project is divided into three construction components:
1. Site Access. Workers will use the existing dirt access road to stage/stockpile in areas that are annually mowed and maintained by the City for easement access. A main access point was identified upstream from the exposed feature, and an alternate access point was identified downstream from the exposed feature. Temporary creek access will need to create an even slope by excavating the top bank and filling the void below to create a side slope using a mini excavator. Access locations were selected with consideration of constructability of needed temporary slopes and because these areas are not vegetated with oak trees. The same soil would be used to fill the void at the toe slope to form an access ramp.
2. Site Preparation. Workers will remove/excavate woody debris from the exposed feature. Smaller tree roots from large red willow tree (Salix laevigata) will be cleared to minimize deleterious material. Red willow tree large roots may need to be cut and may be salvaged for habitat restoration. Using a mini excavator or skid steer the eroded feature surrounding the sewer line will be backfilled and compacted.
3. Protect Sewer Line at Crossing. Rock Slope Protection (RSP) will fill the area
immediately surrounding of the sewer line to support the crossing. Re-establish creek
banks that were eroded away adjacent to the sewer pipe (upstream and downstream) to prevent further erosion at the crossing, and backfill the channel floor to re-establish the grade transition from upstream and downstream.
Contact Information
Name
Darren Nash
Agency Name
City of Paso Robles
Job Title
City Planner
Contact Types
Lead/Public Agency
Phone
Email
Location
Coordinates
Cities
Paso Robles
Counties
San Luis Obispo
Regions
Citywide
Cross Streets
Nicklaus Street at Oak Hill Road
Zip
93446
Total Acres
3.3 acres
Parcel #
009-815-013
State Highways
Highway 101 and Highway 46 East
Railways
Union Pacific Railroad
Airports
Paso Robles Municipal Airport
Schools
Pat Butler Elementary School
Waterways
Franklin Creek, Salinas River
Township
T27N
Range
R12E
Base
MDM
Other Location Info
The project site (figure 1) is east of River Road, south of Niblick Road. The exposed sewer trunk is approximately 225 feet west of Nicklaus Street and immediately northwest of Pat Butler Elementary School. (35.611811 N, 120.675035 W)
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Class 1 Categorical Exemption 15301b
Reasons for Exemption
This project is consistent with the Class 1b Categorical Exemption because the proposed work activities will protect an existing public sewer line and is not intended to expand the capacity/use of the existing sewer line.
County Clerk
San Luis Obispo
Attachments
Notice of Exemption
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