Question=The reference special provision section, pp2, states: "Existing
concrete pavement and underlying base material shall be removed and replaced
with base material and RSC pavement..."  The same section, pp2, second
sentence, states:"Each pavement panel shall be removed in one or more pieces
without disturbance or damage to the underlying base."  This appears to be
directly contradictory, with one sentence stating to remove the base
material and the other stating that the base material is not to be damaged.
What is the intent and actual requirement of the specifications?

• Please refer to addendum No 2.

Question=Where is the roadway exc type Z-2?
Does it have asphalt concrete paving on top of it?
How wide is it?
How long is it?
How deep is it?
Can you provide a "construction detail" of this work?
What do we do with the void once the roadway exc type Z-2 is excavated an
hauled away?
Is there no place within the entire District where 870 cubic meters of dirt
with some aerially deposited lead could be buried and covered with "clean"
dirt, as has been done on other contracts, at a cost to the district of a
fraction of the cost of hauling this material to Kettleman City, the nearest
Class 1 disposal site, and paying their astronomical dump fees?

• Please refer to addendum No 2.

Question=What do you hope to accomplish with this two layer method?  With 
these traffic closure constraints the first layer must be followed by the 
second layer within minutes. From our experience with rapid strength 
concrete, we would anticipate that the initial lower layer of RSC would 
generate so much heat of hydration that the second layer of RSC would have 
its hydration so acclerated that finishing would be next to impossible, its 
final strength would be severely compromised, and major cracking would be 
guaranteed. 

•  The base layer will have an advanced state of temperature development compared to the top layer.  This fact should be considered when coming up with the mix design.  The trial slab placement will be under the same conditions as the production slabs, i.e. two layers, giving the contractor the opportunity to show that he has overcome the stated concern.  It is not impossible to do the work as designed. In order to meet the design goal it is necessary to place the concrete in two seperate lifts with a bond breaker placed between the two. 

Question=I have read the spec section as stated in addendum 2 several times.
The contradictory lines remain unchanged. The first sentence of the second
paragraph states: "Existing concrete pavement and underlying base material
shall be removed and replaced with base material and RSC pavement within the
same period."  The second sentence of the fourth paragraph states: "Each
pavement panel shall be removed in one or more pieces without disturbance or
damage to the underlying base."
Can you not see that one sentence says to remove the underlying base while
the other sentence says we are not to disturb or damage the underlying base?

• Please refer to addendum No 3.

Is this information relevant to this project. and if so where will this material be used?

• No. This paragraph has inadverdantly been left in place and is not relevant.  Section 10-1.35 seal pavement joint , SILICONE JOINT SEALANT of the Special Provisions is for SILICONE JOINT SEALANT.

Question=The provisions of section 10-1.15 regarding lane closure
limitations and the working clearance requirements of section 5-1.04 are
mutually contradictory and render the project impossible to construct.
Section 5-1.04 REQUIRES that the adjacent traffic lane be closed when
working within 1.8 meters of the traffic lane in a speed zone of 45 mph or
more.  Section 10-1.15 REQUIRES that the adjacent traffic lane be kept open
for the convenience of the travelling public.  In keeping the lane open that
is immediately adjacent to a lane wherein a concrete slab is being removed
and replaced or asphalt concrete is being milled and repaved, the travelling
public is placed in the position of driving at or near freeway speed within
inches of construction activity, exposing it to great potential danger, and
posing an even greater threat to the workmen engaged in the work.  On route
163, the great majority of the shoulders are very narrow and offer no relief
to this situation. What can be done to alleviate this unnecessary risk of
life and limb?
 

• Please refer to addendum No 4.

Question=The nominal thickness of the pavement and base to be replaced with
RSC is 350mm.  The paragraph on page 182 headed "REPLACEMENT BASE LAYER"
states that base materials shall be replaced with a replacement base layer
of rapid strength concrete in a separate and distinct operation from that of
replacing concrete pavement.  What, if any, is the required thickness of
this layer?

• The base layer, when it is replacing an existing base, will be the same thickness as the existing base.

• Both tables apply.

• If the panel is opened to traffic at a low strength, there is a high risk of damaging the panel by traffic due to inadequate strength.  Thus the removal requirement for slabs that are opened at a low strength. Twentyone days are provided so the crack that forms on the day of opening at too low of a strength will have time to become visible, a crack is not always visible right away.

In the plans on sheet# 32, C-5, it shows arubber joint seal detail for PCCP. The notes talk about different size joints anddifferent methods of sawing and sealing the joints.
If the asphalt rubber detail is used on the job, how will this be paid?
 

• There is no option available to the contractor to use asphalt rubber joint seal. 

The area covered by this chart states in the "Location at SB RTE 163 off-ramp to WB RTE 8"
Should chart #19 description be JCT RTE 8 to Ash St?

• Please bid per the contract documents.