Supplemental study for year 3
Download
1 / 92

Supplemental Study for Year 3 - PowerPoint PPT Presentation


  • 81 Views
  • Uploaded on

Supplemental Study for Year 3. Reason for Supplemental Study. Accelerate new lines of research. Tasks Assoc. with Supplemental Funds. Depletion of Cr, Cu, and As during the service life of CCA-treated wood (task 1) Quantity of CCA-treated wood used by major industries (task 2)

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Supplemental Study for Year 3 ' - julio


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

Reason for supplemental study
Reason for Supplemental Study

  • Accelerate new lines of research.


Tasks assoc with supplemental funds
Tasks Assoc. with Supplemental Funds

  • Depletion of Cr, Cu, and As during the service life of CCA-treated wood(task 1)

  • Quantity of CCA-treated wood used by major industries (task 2)

  • TCLP and SPLP tests for unburned CCA-treated wood (task 5)

  • Laboratory Methods for Cr and As speciation (task 3)

  • Identify laboratory methods for organics analysis assoc. with alternative chemicals (task 4)

In-Service Issues

Disposal

Literature Review


Task 5 tclp and splp tests on unburned cca treated wood

Task 5:TCLP and SPLP Tests on Unburned CCA-Treated Wood



Background
Background

  • Year 1 Study -- Collected samples of processed wood from C&D debris recycling facilities in Florida. Found that approximately 6% of wood stream was CCA-treated.

  • Year 2 Study -- Characterized ash from the combustion of CCA-treated wood and wood mixtures. Found that the presence of 5% CCA-treated wood caused ash to fail TCLP and be characterized as a hazardous waste.


Background1
Background

  • No leaching studies were conducted on unburned CCA-treated wood as part of year 1 and 2 studies.


When is leaching a concern
When is Leaching a Concern?

  • Leaching during In-Service Use

  • Leaching during Storage

  • Leaching upon Reuse of Mulch

  • Leaching during Disposal


Leaching tests on unburned cca treated wood in year 3 supplemental project
Leaching Tests on Unburned CCA-Treated Wood in Year 3 Supplemental Project

  • Leaching of new CCA-treated wood using standardized regulatory leaching tests

  • Leaching of wood mulch produced by C&D debris recycling operations


Leaching of new cca treated wood using standardized regulatory leaching tests
Leaching of new Supplemental ProjectCCA-treated wood using standardized regulatory leaching tests


Types of leaching tests
Types of Leaching Tests Supplemental Project

  • Batch Tests

    • Toxicity Characteristic Leaching Procedure (TCLP)

    • Synthetic Precipitation Leaching Procedure (SPLP)

  • Column Tests

  • Field Tests


Testing results to be discussed
Testing Results to be Discussed Supplemental Project

  • Ten samples of CCA-treated wood purchased from home supply stores

    • TCLP

    • SPLP

    • Particle Size

  • One sample

    • TCLP, SPLP, EP, WET, MEP


Reminder for arsenic
Reminder for Arsenic Supplemental Project

  • Toxicity Characteristic

    • Arsenic: 5 mg/l

    • Chromium: 5 mg/l

  • Groundwater Cleanup Target Level

    • Arsenic: 0.05 mg/l

    • Chromium: 0.10 mg/l

    • Copper: 1 mg/l


How are tclp and splp tests applied
How are TCLP and SPLP Tests Applied? Supplemental Project

  • TCLP: To determine if solid waste is hazardous by toxicity characteristic. Note: Discarded arsenical-treated wood is exempt under RCRA.

  • TCLP: To determine is hazardous waste can be land disposed.

  • SPLP: To determine if land-applied waste or contaminated soil presents a risk to groundwater from chemical leaching.


Tclp and splp
TCLP and SPLP Supplemental Project

  • Batch tests.

  • TCLP: Municipal Landfill

  • SPLP: Acidic Rain

  • 100 g of waste per 2 L of leaching solution.

  • Extracted for 18 hours.

  • Leachate if filtered and analyzed.


TCLP: Arsenic Supplemental Project(Sawdust)


TCLP: Chromium Supplemental Project(Sawdust)


TCLP: Copper Supplemental Project(Sawdust)


SPLP: Arsenic Supplemental Project(Sawdust)


SPLP: Chromium Supplemental Project(Sawdust)


SPLP: Copper Supplemental Project(Sawdust)


TCLP Arsenic Supplemental ProjectImpact of Particle Size

Chips

5 Blocks

1 Block

Sawdust


Comparison of Supplemental ProjectSPLP & TCLP (As)


Comparison of Supplemental ProjectSPLP & TCLP (Cu)


Comparison of Supplemental ProjectBatch Leaching Tests(Arsenic)

SPLP

EP

WET

TCLP


Multiple Extraction Procedure Supplemental Project(Arsenic)


Implications of leaching tests
Implications of Leaching Tests Supplemental Project

  • Without the exclusion, CCA-treated wood would often be a characteristic hazardous waste.

  • If SPLP results are compared to GWCTLs, should not be disposed in an unlined landfill (based on current policy for other wastes).



Mulch Supplemental ProjectBagging Operation


Leaching from land applied mulch
Leaching from Land Applied Mulch Supplemental Project

  • The SPLP is the test most commonly used to assess leaching from a land applied waste.


C&D Wood Mulch Supplemental ProjectAs in SPLP Leachates

Total Samples: 58

Mean: 153 ug/l

Range: 21 to 658 ug/l

51 Samples > 50 ug/l

0

50

100

200

300

400

500

600

Arsenic Concentration (ug/l)


Implications for mulch
Implications for Mulch Supplemental Project

  • When considering SPLP leaching, CCA-treated wood must be present at levels of less than 1% in wood mulch to meet current groundwater standards.

  • Most C&D wood samples are already greater than 1%.


Task 2 major use sectors

Task 2: Supplemental ProjectMajor Use Sectors


Cumulative arsenic quantities
Cumulative Arsenic Quantities Supplemental Project


Florida production
Florida Production Supplemental Project


U s southern pine markets
U.S. Southern Pine Markets Supplemental Project

(From SFPA)

10%

36%

18%

8%

15%


Double check values for florida
Double-Check Values for Florida Supplemental Project

  • Focus

    • Transportation Sector

    • Utility Poles

    • Docks


Transportation sector
Transportation Sector Supplemental Project

  • Initial contact with FDOT Districts


Utility poles
Utility Poles Supplemental Project

  • Compiled volume of treated wood for 1998 from questionnaires sent out last year

  • Scaled data by population served

  • Scaled 1998 data against US historical pole production statistics


Utility Poles Supplemental Project

  • Preliminary Results

    • 1600 tons of As (Cumulative)

    • 6% of all As associated with CCA-treated wood that is currently in service


Residential docks
Residential Docks Supplemental Project

  • Evaluated data for 3 counties (Alachua, Dade and Leon)

  • For each county, we

    • Obtained copies of dock building permits

    • Contacted the Property Appraisers Office

    • Reviewed aerial photographs

    • Contacted dock manufacturers


Results from permits
Results from permits Supplemental Project

  • Alachua

    • 41 permits reviewed

    • Approx 486 (freshwater) docks permitted since recording in 1994

  • Dade

    • 100 permits reviewed

    • Approx 6000 (marine) docks permitted since recording in 1980

  • Leon

    • 71 permits reviewed

    • Approx 450 (freshwater) docks permitted since recording began in 1993


Material distribution in alachua county docks
Material distribution in Alachua County Docks Supplemental Project

Predominantly Freshwater Docks


Material distribution in dade county docks
Material distribution in Dade County Docks Supplemental Project

Predominantly Salt water Docks


Material distribution in leon county docks
Material distribution in Leon County Docks Supplemental Project

Predominantly Freshwater Docks


Preliminary results
Preliminary Results Supplemental Project

  • Obtained Typical Retention Levels

  • Average Dock Size (Surface Area)

  • Typical Design

  • Scale Data to County Population

  • Numbers Computed Appear Low


Possible reasons for small no
Possible Reasons for Small No. Supplemental Project

  • Not all docks have been permitted

  • Other marine applications (Piers, Bulkheads, etc….

  • SFPA estimates that docks represent 32% of marine applications


Task 1 depletion during service life

Task 1: Supplemental ProjectDepletion During Service Life


Task 1 depletion during service life1
Task 1: Depletion During Service Life Supplemental Project

Methods

  • Literature Review

  • Sample Soils Below CCA-Treated Decks

  • Analyze Soil Samples


Task 1 depletion during service life2
Task 1: Depletion During Service Life Supplemental Project

Sample soils below CCA-Treated Decks

  • A total of nine decks sampled

    • 3 in Gainesville

    • 3 in Miami

    • 2 in Tallahassee (1 other deck sampled, not CCA-treated)

  • Samples collected in a grid-like fashion below each deck

  • Initially, at least 2 background samples were collected near each deck. Later, a total of 8 were collected

  • A core sample/sawdust collected


Gainesville decks

Paynes Prairie Supplemental Project

Gainesville Decks

Foot Bridge at NW 34th St

Bivens Arm Park


Miami decks
Miami Decks Supplemental Project

A.D. Barnes Park

Oleta River Park

Tropical Park


Tallahassee decks
Tallahassee Decks Supplemental Project

Maclay Gardens

Lake Talquin

Tom Brown Park


Sampling grid
Sampling Grid Supplemental Project


Soil core
Soil Core Supplemental Project


Stains wood bore sawdust
Stains, wood bore, & Supplemental ProjectSawdust

XRF Analysis by

Robbins Manufacturing


Deck retention levels
Deck Retention Levels Supplemental Project


Grain size analysis
Grain Size Analysis Supplemental Project


Volatiles vs as concentration
Volatiles vs. As concentration Supplemental Project




Background information
Background Information Supplemental Project

  • The Florida Department of Environmental Protection has developed a set of risk-based concentration levels of chemicals in soil:

    The Soil Cleanup Target Levels (SCTL)

  • Direct Exposure

    • Residential SCTL for As is 0.8 mg/kg.

    • Industrial SCTL for As is 3.7 mg/kg.


Background information1
Background Information Supplemental Project

  • The naturally occurring As concentration in Florida soils has been measured (Ma et al. 1999).

  • Geometric Mean = 0.42 mg/kg

    • 73% of soil samples were less than 0.8 mg/kg

    • >90% of soil samples were less than 3.7 mg/kg


Summary
Summary Supplemental Project

  • The mean As concentration under 8 of the 9 decks exceeded the industrial Florida SCTL of 3.7 mg/kg.

  • Sixty one of 73 of the individual soil samples exceeded the industrial Florida SCTL.


Additional sample collection
Additional Sample Collection Supplemental Project

  • Additional control samples were collected and analyzed to assist with statistical comparison


Gainesville Site BP Supplemental ProjectDeck Samples: As = 41.6 mg/kg (n = 8)Control: As = 7.0 mg/kg (n = 2)


Gainesville Site BP Supplemental ProjectDeck Samples: As = 41.6 mg/kg (n = 8)Control: As = 2.6 mg/kg (n = 8)


Copper and chromium analysis
Copper and Chromium Analysis Supplemental Project

  • Analysis of Copper and Chromium has been completed


Comparison of Chromium Supplemental Projectand Arsenic


Comparison of Copper Supplemental Projectand Arsenic


Soil cores
Soil Cores Supplemental Project

  • One soil core was collected from underneath each deck




  • Miami Site OP Supplemental ProjectSoil Core Data

  • Arsenic

  • Chromium


  • Miami Site OP Supplemental ProjectSoil Core Data

  • Arsenic

  • Chromium

  • Copper


Questions
Questions? Supplemental Project


ad