FW Wurst VIMS

Hey Sharon,

I hope you’re well.

I’ve been working with Dan Nielsen on the Wurst property. As you can
see in his email below, our client and PD, McQueen Campbell wants to see
an approved VI mitigation system in place with performance assessment
completed prior to closing on the property. Economics of the
transactions have him on a tight time line.

The attached documents will convey information about the pilot test
that is being run for the sub-slab depressurization system. It’s not as
much to review as it might appear looking at the document list.

Could you, and Dan and I, get together soon, either by phone or at
Green Square, maybe Friday or early next week, to review the project and
discuss VIMS performance assessment?

Thanks for your help, I’m looking forward to talking.

Will

From: Dan Nielsen
Sent: Tuesday, February 02, 2016 5:45 PM
To: Will Service <[e-mail]>
Subject: Wurst VIMS

Will,

Here is an update on the activities we have conducted at Wurst with
respect to the development of a plan for the VIMS.

Let me start by saying that McQueen Campbell will not close on the
property until he is sure that a VIMS is running at the facility and
that its performance is satisfactory to the BFP. Let me add that his
goal is to accomplish this by the end of February. Yes, a very tight
schedule.

This is what we have done to try and meet his very aggressive timeline.

1) On December 15 and 16 we conducted preliminary assessment of
the depressurization of the sub slab. As you may recall, we identified
that two area of the facility require VIMS based on our indoor air
sampling (September 16, 2015 report). Both of these areas were in the
1983 east addition. One area is referred to as the Office Area and the
other is referred to as the Plant Area. We have pretty good construction
drawings of these areas. These drawing show a good layer of gravel under
the slabs. The field data from the preliminary sub slab depressurization
is attached and showed influence of roughly 30 feet when running the
test of both low flow and high flow test blowers. The influence in the
office area was more uniform, creating a ‘round’ zone of influence. In
the Plant Area, the influence was more elliptical due to some thickened
slab used to support the old printing presses.

2) From this data and in cooperation with McQueen and his
redevelopment plans which require the extraction points be located at
columns we laid out a full-scale pilot test extraction field. We
determined that 13 points (attached drawing, 5 in office and 8 in plant)
should give us the coverage we need based on the preliminary
depressurization data. McQueen approved of the layout on January 9.

3) On January 14 I met contractors at the site so that they could
see the project site and provide bids to construct the 13 point
extraction network. I asked them to size the blower based on the
preliminary data so we could get an idea what the complete system would
most likely cost. However, our plan is to install the extraction and
piping network and hook it up to a temporary variable speed blower. This
will allow us to confirm that the extraction network is adequate (or
not) to depressurize the slab and will allow us to conduct further
testing to determine the appropriate sized blower.

4) McQueen selected PRM (proposal and figures attached) to conduct
the installation on January 27 and they started on January 30. They plan
to have the piping completed by the beginning of next week and the
temporary blower in by mid-week. Then we will start our final testing of
the sub slab depressurization. If all goes well, we will have the
temporary blower up and running and adjusted by February 12. We went
with the upsized manifold pipe option to give us the greatest
flexibility in the event this final testing indicates that we need
additional extraction points.

The question I need help getting answered from you, is what performance
data do we need to collect to demonstrate to the BFP that our system is
satisfactory? Keep in mind, McQueen wants to get his answer by the end
of the month.

Thanks,

Dan

Daniel H. Nielsen, PE, RSM, LEED-AP

Vice-President, Principal Engineer

MID-ATLANTIC ASSOCIATES, INC.

409 Rogers View Court | Raleigh, NC 27610

919-250-9918 | 919-250-9950 (Facsimile) | 919-614-3988 (Mobile)

www.MAAONLINE.com <http://www.maaonline.com/> | Outstanding Service
Since 1993

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