07.21.2003 - Duenas Daniel Plaza- Re: arsenic Page 1
From: Daniel Plaza
To: Gus Duenas
Subject: Re: arsenic
I understand,
dan
>>> Gus Duenas 07/21/03 09:25AM >>>
We will not be doing anything with the arsenic as part of the library project. It is in the floodplain
(we are not allowed,with certain exceptions, to work in the floodplain)and removal is only
necessary if we are to use that area for another purpose,such as a trail. I anticipate a trail project
would have to deal with the arsenic in the area it crosses.The arsenic is not a problem unless we
disturb the soil and create dust. It will be a problem if the area is to be used as a gathering area
for library programs. That has to be examined and discussed in greater detail if it is to be allowed.
The presence of that material may preclude use of the area unless it is cleaned up beforehand.
Cleanup probably means removal of the top two feet(at most) and replacement with clean
backfill.Apex Environmental can give us a work plan for that if we want to make it a project by
itself later. I don't want to tie it to the library at this point.
Agustin P. Duenas, P.E.
City Engineer
City of Tigard
13125 SW Hall Boulevard
Tigard, OR 97223
Phone: (503) 639-4171 x2470
Fax: (503)624-0752
gus(&ci.tigard.or.us
>>> Daniel Plaza 07/21/03 08:59AM >>>
Gus,
by my calculations it looks as if there is an approximately 300+ square feet"hot"area extending into the
proposed public gathering space.
It does not appear that the "hot"area affects the trail alignment but it does extend into the public
gathering area.
What is the plan to remove the portion in the public gathering space? It seems to me that the area should
be "cleaned-up"
when the building area is taken care of.
Although I did not budget for the removal of arsenic from this area it seems to me that I could make funds
available for the park portion of the work.
Let me know what you think
dan