blanchard plup presentation 11-18-08
TRANSCRIPT
Post-Closure Land Use
PlanningFormer Blanchard Disposal Facility
County of Los Angeles
Chief Executive Office
And
Department of Public Works
Presentation Overview
Introduction
Historical Summary
Regulatory Overview
Current ConditionsTopography and Settlement
Drainage and Erosion
Landfill Gas
Proposed ImprovementsDrainage and Erosion
Landfill Gas Monitoring Probes
Next Steps
Closing Comments
INTRODUCTION
Introduction
Purpose of this meeting:1. Provide a status update of work performed at
Blanchard
2. Discuss progress of studies being performed
3. Open a dialog with LEA and RWQCB
Location of Blanchard Disposal Facility
Location of Eastern Hill Complex
Introduction
Vicinity Map
Introduction
Eastern Hill Complex
Site Plan
Introduction
Site Plan Detail with Blanchard
HISTORICAL SUMMARY OF BLANCHARD
Historical Summary of Blanchard
Blanchard opened in approximately 1935 and operated as a burn dump until approximately 1946.
Between 1946 and 1958 the facility operated as a Class II landfill under the ownership of Ben K. Kazarian.
Under Industrial Waste Disposal (IWD) Permit #43, was allowed to accept liquid, solid, chemical, and industrial wastes, with the exception of hazardous wastes.
In 1957, the State of California condemned a small portion of the southeast portion of Blanchard for construction of the Long Beach Freeway (I-710).
Approximately 300,000 cubic yards of waste were removed from the area condemned for I-170 and re-deposited farther north, on the Blanchard site.
In 1958, Blanchard ceases operations
Historical Summary
1938
Aerial Photograph
Historical Summary
1949
Aerial Photograph
Historical Summary
1956
Aerial Photograph
Historical Summary
1962
Aerial Photograph
Historical Summary
Prior Environmental Investigations
10 environmental investigations at Blanchard between
1950 and 2007
Landfill gas
Potential surface water and groundwater impacts
Environmental feasibility study of disposal site conditions
Prior Geotechnical Investigations
6 geotechnical investigations at and around Blanchard
between 1990 and 2007.
Soil characteristics and underlying geology
Extent of refuse
Engineering hazards and slope stability
Historical Summary
Eastern Hill Complex
Borings and Probes
REGULATORY OVERVIEW
Regulatory Overview
Disposal site post-closure land use are regulated pursuant to Title 27, California Code of Regulation (27 CCR), Section 211190.
Closure and post-closure maintenance plan requirements of 27 CCR Chapter 4, Subchapter 4 are not applicable for facilities that ceased operating prior to January 1, 1988 (27 CCR 21770(b)).
If a significant change in post-closure land use is proposed, a post-closure land use proposal should be submitted to the LEA to address:
Structures within 1,000 feet of the disposal area
Structures on top of waste
Modifications to low permeability layer (not applicable to Blanchard)
Irrigation over waste (27 CCR 21190 (c))
Regulatory Overview
27 CCR also proscribes jurisdictional involvement of the State
Water Resources Control Board (SWRCB) and nine Regional
Water Quality Control Boards (RWQCB)
The County of Los Angeles has two departments addressing solid
waste management:
1. Department of Public Health (LADPH), Solid Waste Management
Program (SWMP) – acting as the local enforcement agency (LEA)
2. Department of Public Works (LADPW) with respect to methane
mitigation as it pertains to the County’s Building Code.
South Coast Air Quality Management District (SCAQMD) with
respect to air quality considerations, such as landfill gas
emissions to the atmosphere, landfill gas control systems, etc.
CURRENT CONDITIONS
Current Conditions
Topographic Settlement Analysis
Settlement analysis for portions of the Eastern
Hill Complex performed by comparing
September 2008 with 2006 survey data.
Area of potential settlement and increased
surface elevation were identified
Current Conditions
September 2008
Aerial Survey Map
Current Conditions
Blanchard 1 – 5 Foot
Settlement Map
Current Conditions
Blanchard 1 – 5 Foot
Increase Map
Current Conditions
Drainage and ErosionAge and construction of surface water drainage improvements
at Blanchard are unknown, documentation not encountered.
From variations in type and construction, it appears likely
drainage improvements were constructed, repaired and
modified several times since originally constructed.
Apparent surface drainage of top deck is via Sheriff’s Road to
the west. Slopes and benches designed to drain eastward to
Laguna Wash.
Current Conditions
Surface Water Flow
and Drainage at
Blanchard
Current Conditions
Landfill Gas Monitoring
Probe
NumberProbe Location
Sampling
Data RangeStatus
P-1 to P-8
Sheriff’s Academy and County
maintenance buildings
(southwest of Blanchard)
1995-2008
Only P-3, P-5,
and P-6 could
be found
in 2008
BP-1 to
BP-8
SEB- Biscaliuz (northwest of
Blanchard)2007 - 2008
BP-1 not
regularly
located
Current Conditions
Existing LFG Probes
Current Conditions
LFG Monitoring Probes P-1 Through P-8
P-1 through P-8 located along former LFG
control system at southwest portion of Blanchard
Historic data (LEA) evidence no to low detected
methane concentrations
Monitoring also evidences elevated carbon
dioxide and suppressed oxygen concentrations
Current Conditions
LFG Monitoring Probes BP-1 through BP-8
Installed in 2007 around Sheriff’s administration building at SEB
Multi-level probes (10-ft and 25-ft bgs)
Methane concentrations ranging from not detected to greater than 50 percent
Carbon dioxide concentrations to 40 percent
Suppressed oxygen concentrations
PROPOSED IMPROVEMENTS
Proposed Improvements
Drainage and Erosion
Known areas of drainage deficiencies and erosion
Two areas of with greatest need for engineering
improvements:
1. Drainage conveyance failure and slope erosion below
McBride Avenue on eastern facing slope
2. Ponding of stormwater at eastern parking lot at SEB
Proposed Improvements
Drainage and Erosion
Drainage conveyance failure and slope erosion below
McBride Avenue on eastern facing slope.
Temporary solution implemented by Los Angeles County
Engineering alternatives for permanent solution are
currently being designed
Proposed Improvements
Drainage and Erosion
Proposed Improvements
Drainage and Erosion
Ponding of stormwater at eastern parking lot at SEB
Water ponding due to need for infrastructure improvements
at Eastern Hill Complex
Engineering alternatives include drainage conveyance
improvements at Blanchard
Proposed
Improvements
Storm Drain
Alignment for
Eastern Hill Complex
Proposed Improvements
Initial LFG Probe Installation
Distribution of existing LFG probes and data are limited
Six (6) initial multi-depth LFG probes are proposed
The purpose to obtain current information across the greater Blanchard area concerning LFG generation.
Probe installation will provide additional, current information on refuse and cover placement and thicknesses
Current, more extensive LFG data will support post-closure land use planning for the Blanchard disposal facility
Current, more extensive LFG data will facilitate comprehensive land use planning for the Eastern Hill Complex.
Proposed
Improvements
Existing & Proposed
Initial LFG Probes
Proposed Improvements
Initial LFG Probe Installation
Estimated Cover, Refuse, and Bedrock Occurance
Blanchard Disposal Facility
Proposed LFG Probe Cover Thickness (ft) Refuse Thickness (ft) Depth to Bedrock (ft)
1 20 ~10? 30+
2 ~10+ ? >10+?
3 50 30+? ~80+
4 40 ~50 ~70 - 80
5 <10? >10 >20
6 <10? ? ?
Notes:
(1) Cover, refuse, and bedrock occurrences estimated from cross sections prepare
from thrid-party reports associated with Blanchard & Cogen disposal sites.
(2) Actual cover, refuse, and bedrock occurrence will be recorded during drilling
Proposed Improvements
Initial LFG Probe Installation
LFG Probe #1
Location: West of Blanchard, southwest of Sheriff’s administration
Purpose:1. Evaluate cover thickness and presence of refuse
2. Multi-completed probe to monitor LFG at perimeter of fill
3. Establish long-term monitoring point between fill and structures
4. Evaluate current LFG generation to support LFG monitoring network for post-closure monitoring
Typical Construction:1. Shallow probe approximately 10 ft bgs
2. Intermediate probe approximately mid-point of nearest refuse
3. Deep probe approximately 10 ft below bottom of nearest refuse
Proposed Improvements
Initial LFG Probe InstallationLFG Probe #2
Location: West of Blanchard, south of Sheriff’s Road, near fire station
Purpose:1. Evaluate cover thickness and presence of refuse
2. Multi-completed probe to monitor LFG at perimeter of fill at greater depths than previously done at this location
3. Establish long-term monitoring point between fill and structures
4. Evaluate current LFG generation to support LFG monitoring network for post-closure monitoring
Typical Construction:1. Shallow probe approximately 10 ft bgs
2. Intermediate probe approximately mid-point of nearest refuse
3. Deep probe approximately 10 ft below bottom of nearest refuse
Proposed Improvements
Initial LFG Probe Installation
LFG Probe #3
Location: West of Blanchard, south of fire station, east ISB parking lot
Purpose:1. Evaluate cover thickness and presence of refuse
2. Multi-completed probe to monitor LFG at perimeter of fill at greater depths than previously done at this location
3. Establish long-term monitoring point between fill and structures
4. Evaluate current LFG generation to support LFG monitoring network for post-closure monitoring
Typical Construction:1. Shallow probe approximately 10 ft bgs
2. Intermediate probe approximately mid-point of nearest refuse
3. Deep probe approximately 10 ft below bottom of nearest refuse
Proposed Improvements
Initial LFG Probe Installation
LFG Probe #4
Location: Southeast side of running track, area of greatest thickness of refuse
Purpose:1. Evaluate cover thickness and thickness and comosition of refuse
2. Installation of large-diameter probe that can also be used for potential LFG extraction testing
3. Evaluate current LFG generation within refuse mass
4. Evaluate current LFG generation to support LFG monitoring network for post-closure monitoring
Typical Construction:1. Shallow probe approximately 10 ft bgs
2. Intermediate probe approximately mid-point of nearest refuse
3. Deep probe approximately 10 ft below bottom of nearest refuse
Proposed Improvements
Initial LFG Probe Installation
LFG Probe #5
Location: West of Sheriff’s Road, near intersection of Blanchard and Cogen
Purpose:1. Evaluate cover thickness and presence of refuse
2. Multi-completed probe to monitor LFG at perimeter of fill
3. Establish long-term monitoring point between fill and structures
4. Evaluate current LFG generation to support LFG monitoring network for post-closure monitoring
Typical Construction:1. Shallow probe approximately 10 ft bgs
2. Intermediate probe approximately mid-point of nearest refuse
3. Deep probe approximately 10 ft below bottom of nearest refuse
Proposed Improvements
Initial LFG Probe Installation
LFG Probe #6
Location: Near eastern extent of Blanchard at approximate Cogen boundary
Purpose:1. Evaluate cover thickness and presence of refuse
2. Multi-completed probe to monitor LFG at perimeter of fill
3. Establish long-term monitoring point between fill and structures
4. Evaluate current LFG generation to support LFG monitoring network for post-closure monitoring
Typical Construction:1. Shallow probe approximately 10 ft bgs
2. Intermediate probe approximately mid-point of nearest refuse
3. Deep probe approximately 10 ft below bottom of nearest refuse
NEXT STEPS
Next Steps
Preparation of initial LFG probe installation work plan for
LEA review and approval.
Installation initial LFG probes.
Development of Post-closure Maintenance Plan for
Blanchard for LEA and LARWQCB review and approval.
Finalize Eastern Hill Complex storm drain improvements
with LEA and LARWQCB review and approval.
CLOSING COMMENTS