Memo on safe site perimeter controls at Ground Zero, Oct

NYC 9/11 Public Portal Document

J.

MEMORANDUM

Department of d Environmental Protection TO; Joel A. Miele Sr., P.E. - SS-IZJuncfionBodmrd Corona, New York FROM; Robert C. Avaltroni 113«&-S107

DATE; October 2,2001 Joel A. Miele Sr.,P.E. SUBJECT; Future Progress at WTC Site Commissioner

The feasibility of moving the current safe site perimeter in closer proximity to ground zero can only be safely achieved after major site controls occur.

DERTA recommends, at a minimum, the following control measures be implemented at ground zero. Firstly, a permanent three story non-permeable barrier should be erected around ground zero. DERTA recommends a walk through with the appropriate agencies to _ develop the boundaries for this barrier. One will have to look at which buildings can be quickly repaired and which will require more extensive work. This would be one criteria for being inside the boundary.

Secondly, a permanent dust suppression mist control system needs to be employed inside the perimeter of the established boundary. A portable weather station should be used to monitor wind speed and direction in an effort to better direct suppression control activities.

Thirdly, entry and exit points should be kept to an absolute bare minimum to prevent the spread of contamination into the adjacent communities. DecontaminaVon procedures need to be strictly adhered to by vehicles as well as personnel leaving the site.

All site activities will then need to be covered by a site safety plan, which would need to be followed by all personneL

Once these ur similar types of control measures are implemented as a minimum standard, then we can better a;3Jress the feasibility of clearing outdoor areas in closer proximity to ground zero.

(ww.ri.nyc.iiji.us/dep) (718) DEP-HELP

■ NYC-WTC_o6o1’51357