40-Acre Mobile Home Park

 

Southfield, Michigan

                                                                                                                                                                      

 

This project involved the residential redevelopment of a 40-acre mobile home park in Southfield, Michigan. The Site contained over 500 mobile home lots and six support buildings and it was determined that the mobile home park had been built over an unlicensed landfill.  The project included the following services:

 

  • Due Diligence

    • Phase I/II/III Environmental Site Assessments (ESAs)

    • BEAs/Due Care Plans

 

  • Subsurface Investigation

    • soil, groundwater, soil gas

    • geophysical surveys

    • test trenches

    • geotechnical soil borings

    • landfill materials

 

  • Hazardous Material Surveys

    • asbestos

    • misc. hazardous materials

    • ASTs, USTs, electrical transformers

 

  • Decommissioning

    • asbestos abatement,

    • hazardous material removal

    • AST/UST removal

    • MDEQ approved UST closures

    • transformer removal

    • water supply well abandonment,

    • demolition of structures,

    • pavement and utility removal

 

  • Remediation

    • contaminated soil

    • waste materials

    • entrained water

 

During the 2-3 year duration of these services, numerous challenges were encountered.  The following paragraphs outline the more notable challenges and the innovative solutions used.

 

Challenge: Site investigation/characterization was performed while the site was operating and occupied, resulting in significant limitations on access and requiring extreme care.

 

Solution:  The initial phase focused on general site characterization including extensive review of existing plans and historical records. Subsequent phases provided more detail and included regular coordination with utility companies, geophysical studies for non-intrusive data gathering and focused data extrapolation.

 

Challenge: Due to structural concerns, massive earthwork was required. As such, initial cost estimates for earth moving and soil import/export exceeded available funding.

 

Solution:  A vital aspect of the work included the creative re-use of over 10,000 tons of non-impacted site soils during redevelopment. Substantial and ongoing geotechnical evaluation of the soil was implemented to enable its reuse for a variety of applications.

 

Challenge: Code required the use of groundwater sumps with ground surface discharge. However, the groundwater was found to have low levels of certain heavy metals that exceeded allowable storm water discharge limits.

 

Solution: The solution involved incorporating MDEQ approved Low Impact Design (LID) features. The LID design included the construction of storm water infiltration galleries which mitigated the need for off-site discharge.