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

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Presentation on theme: "Beard Elementary School Detroit, USA By Aaron Alarcon & Elizabeth Darby."— Presentation transcript:

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

2 Background Original school was located in Southwest Detroit, Michigan oBuilt in 1886 oVery small oNo cafeteria oOvercrowded oSurrounded by industrial plants t58 polluting facilities – majority of them hazardous waste


4 Background Majority of residents are Spanish-speaking, low income, African American and Hispanic immigrants New Beard Elementary School obuilt on 6.45 acres of vacant lot o5 blocks from original school oconstruction began July 2000 Hispanic = 694 White, non-Hispanic = 186Black, non-Hispanic = 148 American Indian/ Alaskan Native = 8

5 History of site 70 years of heavy industrial use o1909 – brass foundry o – various companies manufacturing steel, radiators, lead batteries, pain, adhesive, and pharmaceuticals o – US Army owned and operated a tank ordinance center o1964 – donated to City Board of Education o – used as a vocational skills center and repair garage for Detroit Public Schools (DPS) o – vacant; owned by DPS

6 Problem Land contaminated with toxic compounds olead oarsenic opolychlorinated biphenyls (PCBs) obenzo(a)pyrene oTrichloroethylene oPNCs Underground storage tanks (UST) Environmental racism Michigan laws ono regulations for developing schools on brownfield sites ono chemical regulations for children

7 Problem High amount of pollution in air already Workers became sick while working on site o2 of 25 ironworkers developed rashes o6 of 98 plumbers made sick with nausea and rashes Unions not warned of problems by DPS or contractors

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

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

10 Solution Site assessment began in 1999 June 2000 oRadiation survey performed oNo violations July 2000 o2 underground storage tanks (UST) and discoloured soil from around the tanks removed ocontaminated soil from 10 sites removed oConstruction began October 2000 oSite re-assessed oContaminated berm found and removed

11 Solution – 2001 February 2001 o2 more USTs removed April 2001 o2 nd assessment of site oAll remaining waste objects removed Summer 2001 oRemoval of existing surface – 66 cm below final grade and off-site disposal oFinal site assessment t5 areas with high PCB levels were excavated

12 Solution - Procedure Soil removal process o9.144 meter square areas oCentered at high concentrations oRemoved and disposed of at off site locations oSamples from walls and floors taken to confirm removal

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

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

15 Solution - Procedure Kindergarten and Preschool Play Areas MOST CONSERVATIVE oGeotextile layer over existing soil o15.24 cm of sand o10.16 cm thick concrete slab w/ reinforced concrete o10.16 cm of pea gravel o30.48 cm of wood fibre as cushioned barrier o20.32 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. osite cap opaved areas oconcrete building floor oother exposure barriers DPS will monitor land and send reports to SDEV and community

17 Alternate Solutions Arsenic and Lead oPhytoremediation tAdd 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 tBrake 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) oincineration in an approved incinerator or high-efficiency boiler (stationary or mobile) Trichloroethylene (TCE) oLasagna™ soil remediation technology tuse of electro-osmosis to move contaminated water through specially designed zones that degrade the water in-situ. Benzo(a)pyrene oInject ozone into soil to promote degradation of polyaromatic hydrocarbons oTreatment requires specialized plants – ozonation systems

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