Drainage Area Drainage Area Jurisdiction Unincorporated ...
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HASLEY CANYON PARK REGIONAL BMP PROJECT CONCEPTUAL PLAN LOS ANGELES COUNTY Hasley Canyon Park Drainage Area Site Locaon Drainage Area Characteriscs Watershed Upper Santa Clara River Drainage Area 187 acres EWMP Group Upper Santa Clara River Drainage Area Jurisdicon Unincorporated County Street Address 28700 West Quincy Street Castaic, CA 91384 Total Impervious 30% Landowner County of Los Angeles Runoff Capture Target 85th Percenle Storm Groundwater Basin N/A Infiltraon Rate Hydrological Soil Group B 0.5-1.0 in/hr Exisng Site Descripon: Hasley Canyon Park is located in the Castaic/Val Verde community of Supervisorial District 5. The park is near stormdrain PD 1854, PD 1913, PD 1821, PD 2262, which discharges into Castaic Creek and eventually Santa Clara River Reach 5. Currently the park provides a children’s playground and an open grass field. Infiltraon Gallery Quanty 1 units Detenon Volume (Total) 9.9 ac-ſt (431,244 ſt 3 ) BMP Footprint (Total) 3.3 acres (143,748 ſt 2 ) BMP Depth 10 ſt (plus 5 ſt cover) Pre-treatment Hydrodynamic Separator Proposed Retrofits Descripon: The proposed project entails the construcon of a diversion from exisng storm drains to an underground infiltraon gallery at Hasley Canyon Park. The project will capture the 85th percenle storm and provide infiltraon capacity through the gallery below the park open space. Street flows will be treated through installaon of green street bio-swales along Quincy Street. The project will also include hydrodynamic sepa- rators for pretreatment, flow meters to determine the diversion rate, and monitoring wells for an effecveness study. Mul-Benefit Descripon: 1) Recreaon: The recreaonal use will be maintained. 2) Groundwater Recharge: The project will provide groundwater recharge through the underground infiltraon gallery. Upon compleon of the con- strucon, infiltraon quanes will be monitored. 3) Water Quality: A short-term monitoring program will be con- ducted to verify the assumpons made in the EWMP. 4) The project will incorporate outreach signage in the commu- nity center and the park to educate the community on the benefits of the project. Schedule PDC (30% Design included) December 2015 Board Leer June 2016 Final Design & CEQA June 2018 Award Contract December 2018 Construcon Closeout June 2019 Effecveness Monitoring July 2019 Preliminary Cost Esmate PDC (30% Design included) $57,000 Project Management (PMD Preferred) $160,000 Design (Design Preferred) $124,000 CEQA (PDD Preferred) $106,000 Construcon $1,063,000 Total $1,510,000 Annual Maintenance & Monitoring $104,000 Legend Exisng Stormwater Pipe Diversion Pipe Infiltraon Gallery Hasley Canyon Park Diversion Profile INFILTRATE INTO GROUND 5’ SOIL COVER 10’ CONCRETE STORMWATER INFILTRATION GALLERY HYDRODYNAMIC SEPARATORS DIVERSION PIPE AGGREGATE/ GRAVEL Infiltraon Gallery Hydrodynamic Separator EXISTING STORMDRAIN SURFACE GRADE
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Hasley Canyon Park Drainage Area
Site Location Drainage Area Characteristics
Watershed Upper Santa Clara River Drainage Area 187 acres
EWMP Group Upper Santa Clara River Drainage Area Jurisdiction Unincorporated County
Street Address 28700 West Quincy Street Castaic, CA 91384
Total Impervious 30%
Landowner County of Los Angeles Runoff Capture Target 85th Percentile Storm
Groundwater Basin N/A Infiltration Rate Hydrological Soil Group B
0.5-1.0 in/hr
Existing Site Description: Hasley Canyon Park is located in the Castaic/Val Verde community of Supervisorial District 5. The park is near stormdrain PD 1854, PD 1913, PD 1821, PD 2262, which discharges into Castaic Creek and eventually Santa Clara River Reach 5. Currently the park provides a children’s playground and an open grass field.
Infiltration Gallery
Quantity 1 units
Detention Volume (Total) 9.9 ac-ft (431,244 ft3)
BMP Footprint (Total) 3.3 acres (143,748 ft2)
BMP Depth 10 ft (plus 5 ft cover)
Pre-treatment Hydrodynamic Separator
Proposed Retrofits Description: The proposed project entails the construction of a diversion from existing storm drains to an underground infiltration gallery at Hasley Canyon Park. The project will capture the 85th percentile storm and provide infiltration capacity through the gallery below the park open space. Street flows will be treated through installation of green street bio-swales along Quincy Street. The project will also include hydrodynamic sepa-rators for pretreatment, flow meters to determine the diversion rate, and monitoring wells for an effectiveness study.
Multi-Benefit Description: 1) Recreation: The recreational use will be maintained. 2) Groundwater Recharge: The project will provide groundwater recharge through the underground infiltration gallery. Upon completion of the con-struction, infiltration quantities will be monitored. 3) Water Quality: A short-term monitoring program will be con-ducted to verify the assumptions made in the EWMP. 4) The project will incorporate outreach signage in the commu-nity center and the park to educate the community on the benefits of the project.
Schedule
PDC (30% Design included) December 2015
Board Letter June 2016
Final Design & CEQA June 2018
Award Contract December 2018
Construction Closeout June 2019
Effectiveness Monitoring July 2019
Preliminary Cost Estimate
PDC (30% Design included) $57,000
Project Management (PMD Preferred) $160,000
Design (Design Preferred) $124,000
CEQA (PDD Preferred) $106,000
Construction $1,063,000
Total $1,510,000
Annual Maintenance & Monitoring $104,000
Legend
Existing Stormwater Pipe
Diversion Pipe
Infiltration Gallery
Hasley Canyon Park Diversion Profile
INFILTRATE INTO GROUND
5’ SOIL COVER
10’ CONCRETE STORMWATER
INFILTRATION GALLERY
HYDRODYNAMIC
SEPARATORS DIVERSION PIPE
AGGREGATE/
GRAVEL
Infiltration Gallery
Hydrodynamic Separator
EXISTING
STORMDRAIN
SURFACE GRADE
