blanchard plup presentation 11-18-08

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