Presentation is loading. Please wait.

Presentation is loading. Please wait.

Beard Elementary School Detroit, USA

Similar presentations


Presentation on theme: "Beard Elementary School Detroit, USA"— Presentation transcript:

1 Beard Elementary School Detroit, USA
By Aaron Alarcon & Elizabeth Darby

2 Background Original school was located in Southwest Detroit, Michigan
Built in 1886 Very small No cafeteria Overcrowded Surrounded by industrial plants 58 polluting facilities – majority of them hazardous waste

3

4 Background Majority of residents are Spanish-speaking, low income, African American and Hispanic immigrants New Beard Elementary School built on 6.45 acres of vacant lot 5 blocks from original school construction began July 2000 Black, non-Hispanic = 148 White, non-Hispanic = 186 American Indian/ Alaskan Native = 8 Hispanic = 694

5 History of site 70 years of heavy industrial use 1909 – brass foundry
– various companies manufacturing steel, radiators, lead batteries, pain, adhesive, and pharmaceuticals – US Army owned and operated a tank ordinance center 1964 – donated to City Board of Education – used as a vocational skills center and repair garage for Detroit Public Schools (DPS) – vacant; owned by DPS

6 Problem Land contaminated with toxic compounds
lead arsenic polychlorinated biphenyls (PCBs) benzo(a)pyrene Trichloroethylene PNCs Underground storage tanks (UST) Environmental racism Michigan laws no regulations for developing schools on brownfield sites no chemical regulations for children

7 Problem High amount of pollution in air already
Workers became sick while working on site 2 of 25 ironworkers developed rashes 6 of 98 plumbers made sick with nausea and rashes Unions not warned of problems by DPS or contractors

8 Key Actors Community Members Detroit Public Schools (DPS)
Need new school but are worried about their children’s health Detroit Public Schools (DPS) Believe the clean up will be acceptable Want to start activities in the school soon as soon as possible Michigan Department of Environmental Quality (MDEQ) Played a key role in ensuring that DPS performed a responsible cleanup of the site requested additional testing in July 2000 and September 2000 Southwest Detroit Environmental Vision (SDEV) the main environmental justice group in the case has used legal actions to ensure DPS will do what they have promised worked to educate and organise community members

9 Solution DPS proposal Final Plan
removal of cm of soil, replacing it with cm of crushed concrete and cm of new soil cost  £75,000 Final Plan excavation and removal of all contaminated soil site cap installed preventing direct contact with potentially contaminated soil on all areas not covered by school building or pavement

10 Solution - 2000 Site assessment began in 1999 June 2000 July 2000
Radiation survey performed No violations July 2000 2 underground storage tanks (UST) and discoloured soil from around the tanks removed contaminated soil from 10 sites removed Construction began October 2000 Site re-assessed Contaminated berm found and removed

11 Solution – 2001 February 2001 April 2001 Summer 2001
2 more USTs removed April 2001 2nd assessment of site All remaining waste objects removed Summer 2001 Removal of existing surface – 66 cm below final grade and off-site disposal Final site assessment 5 areas with high PCB levels were excavated

12 Solution - Procedure Soil removal process 9.144 meter square areas
Centered at high concentrations Removed and disposed of at off site locations Samples from walls and floors taken to confirm removal

13 10.16 cm of compacted crushed concrete
Solution - Procedure Site Caps Divided into 3 zones based on contaminant type and intensity Landscaping Areas 20.32 cm of top soil 10.16 cm of compacted crushed concrete Geotextile layer Existing soil

14 Solution - Procedure Baseball and Soccer Fields
ALSO - Under the baselines of the baseball field an additional 7.62 cm of crushed concrete and 12.7 cm of stone dust were placed 20.32 cm of top soil 20.32 cm of crushed concrete Geotextile layer Existing soil

15 Solution - Procedure Kindergarten and Preschool Play Areas
MOST CONSERVATIVE Geotextile layer over existing soil 15.24 cm of sand 10.16 cm thick concrete slab w/ reinforced concrete 10.16 cm of pea gravel 30.48 cm of wood fibre as cushioned barrier 20.32 cm of concrete wall tied with cm concrete slab surrounding entire area to keep other soil out

16 Results School opened in September 2001
DPS have developed the Due Care Plan for monthly inspections to ensure that unacceptable exposures will not occur in the future. site cap paved areas concrete building floor other exposure barriers DPS will monitor land and send reports to SDEV and community

17 Alternate Solutions Arsenic and Lead Phytoremediation
Add bacterial genes to plants First gene helps convert arsenic/lead from soil to a form water-soluble state able to be ‘sucked up’ by plants Second gene helps the plant detoxify heavy metals and accumulate the molecules in its leaves Brake fern, Pteris vittata (arsenic only) – University of Florida Soaks up arsenic from contaminated soil w/ great efficiency

18 Phytoremediation

19 Alternate Solutions Polychlorinated biphenyls (PCBs)
incineration in an approved incinerator or high-efficiency boiler (stationary or mobile) Trichloroethylene (TCE) Lasagna™ soil remediation technology use of electro-osmosis to move contaminated water through specially designed zones that degrade the water in-situ. Benzo(a)pyrene Inject ozone into soil to promote degradation of polyaromatic hydrocarbons Treatment requires specialized plants – ozonation systems


Download ppt "Beard Elementary School Detroit, USA"

Similar presentations


Ads by Google