I.Changes To The Solicitation Construction Documents:

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1

S
olicitation N
o. C1840110603


Retaining Wall Repairs, Visitors Parking Lot

Thomas Edison National Historical Park

Amendment 1


May 19, 2011


This Amendment transmit
s

the following:


I.

Changes to the Solicitation Construction Documents

II.

Clarifications/Informa
tion



I.

Changes To The Solicitation Construction Documents:


1.

Make the Following Change

to the Specification:

Delete Specification Section 0
10
10,
Summary of Work ,
Paragraph 1.1

and replace
it
with the following new
paragraph 1.1
:


“1
-
1 DESCRIPTION:

A. The

work of this contract consists of the furnishing of all labor, materials, equipment, and
incidentals for:

1.

Demolition and removal of all single
-
wythe
brick facing,
double
-
wythe
brick wall
construction and reinforced concrete coping

from the existing concre
te retaining wall.

2.

Demolition and r
emoval o
f
designated
portions of
existing
concrete retaining wall
construction, including: reinforced concrete retaining wall and footing construction
.


3.

Construction of new
portions of concrete retaining wall, including:
reinforced concrete
retaining wall and footing construction.

4.

Construction of new single
-
wythe
brick facing,
double
-
wythe
brick wall construction, and
reinforced concrete coping

at the entire length and face of existing and new concrete retaining
wall cons
truction.

5.

Demolition of existing catch basin and removal of perforated
drain pipe.

6.

Dispose all debris off park property.

7.

Construction of storm drain water system with Storm Drain
Chambers, PVC pipes,
geotextile, gravel and sand blanket.

8.

Connect New storm d
rain manhole to existing manhole

9.

Re
-
grade and rebuild lawn on obliterated area including loam,
seed and fertilizer.

10.

Removal of five trees, Cutting roots and branches of other
trees interfering with the work
.”


2.

Make the Following Change

to the Specification
: Delete Specification Section 0
205
0,
Selective Demolition,
Paragraph 1.1 and replace with the following new paragraph 1.1
:




“1
-
1
DESCRIPTION:
The work of this section consists of:

A.

Demolition and removal of all single
-
wythe brick facing, double
-
wythe bri
ck wall
construction and reinforced concrete coping from the existing concrete retaining wall.

B.

Demolition and removal of designated portions of existing concrete retaining wall

2

construction, including: reinforced concrete retaining wall and footing constru
ction.

C.

Demolition of existing catch basin and removal of perforated
drain pipe.

D.

Removal
of five

trees, Cutting roots and branches of other
trees interfering with the
work.



3.

Make the Following Change

to the Specification: Delete Specification Section 0
297
5
,
Tree Maintenance
,
Paragraph 1.1 and replace with the following new paragraph 1.1
:



“1.1 The work under this section shall consist of furnishing
all labor, equipment and
materials necessary to perform the
followings:

A.

Removal of five trees with roots sho
wn on the drawing and brush
.

B.

Cut and remove tree branches of the one tree to remain.

C.

Cut and remove roots within 4 feet from the wall of the
one tree

to remain.”


4.

Make the Following Change to the Specification: Delete Specification Section 02975,
Tree Main
tenance, Paragraph 3.1 and replace with the following new paragraph 3.1
and
subparagraph “A”
:




3.1TREES CUTTING AND BRUSH REMOVAL:
The work to be
performed
under this section shall include removing
of five

trees specified on

drawing in accordance with

the American National Standard for
Arboricultural
Operations. The contractor shall remove chips
and debris of the trees on the same
day the tree are removed and
dispose
-
of off the park property legally, unless
approved otherwise
by the COTR. Removal from
the park and disposal is the
responsibility of the contractor. There shall be no sale of
wood on government
property.
The contractor shall take all
reasonable precautions to avoid damaging
surrounding vegetation or lawn areas and prevent gouging and erosio
n of soils a
result
of tree removal operations. Trees that cannot be felled due to
proximity of the
roadways, buildings, structures, utilities,
and/or lack of an adequate felling area
shall be topped and/or
sectioned. The contractor is responsible for taki
ng all
precautions to ensure that the tree will fall where desired. If
a tree cannot be felled
safely in one piece, the tree shall be
topped and/or sectioned. All stumps and roots
shall be cut.


A.

Trees
should be removed to a depth of at least 6 inches (150
mm) below
ground surface. Fill stump and root holes with topsoil as specified in Section
02921 and seed the area as specified in Section 02931.



5.

Make the Foll
owing Cha
nges
to the Drawings
:
Delete construction drawing sheet 2 of 3
entitled “Wall Details
and Drainage” dated 2/22 and replace it with revised
construction
drawing sheet 2 of 3 entitled “Wall Details and Drainage” dated 5
-
19
-
11.


6.

Make the Foll
owing Cha
nges
to the Drawings
:
Add construction drawing sheet no. SK
-
1
dated 5
-
19
-
2011 to the solicit
ation drawings.


II.

Clarifications To The Solicitation Construction Documents:


3


The following are
clarifications/information
and changes to the original
Solicitation i
n are in
response to
written questions submitted by potential bidders:


1.

Bidder
QUESTION:

Please

be advised that due to the proposed construction the
structural integrity of the existing retaining wall will be compromised on the above
subject project. The lateral forces which will be imposed on the wall during the
excavation operation for the
installation of the proposed storm water chambers may cause
the wall to fail unless it is supported and braced along the entire length of the front face.
This support system and bracing is a function of the design aspect of the project and not
the constru
ction of same. Therefore, we request that the aforementioned design be given
to the contractors for bidding purposes
.




Government
RESPONSE: Refer to Specification SECTION 02220 SITE PREPARATION,
EXCAVATION AND FILLING
,

Paragraph 1.4

B. and 3.5 A. B. C.

D.



Document Attachment
s


1.

Revised construction
D
rawing sheet 2 of 3 entitled “Wall Details and Drainage” dated

5
-
19
-
11.


2.

Construction Drawing sheet no. SK
-
1 dated 5
-
19
-
2011
.


END OF DOCUMENT