BIDDER'S INQUIRIES & RESPONSES
DISTRICT 11 CONSTRUCTION
CONTRACT NO:  11-207914
ROUTE / KP 11-SD-5,163-R25.7/R26.7,1.0/6.4
LOCATION In San Diego County In San Diego on Route 5 From Route 5/163 Separation to First Avenue Overcrossing And on Route 163 From Ash Street to San Diego River Bridge
DESCRIPTION Existing Highway Surfacing To Be Cold Planed And Surfaced With Asphalt Concrete And Rubberized AsphaltConcrete, Concrete Pavement To Be Replaced, Metal Beam Guard Railing To Be Reconstructed, Drainage SystemsTo Be Improved, And Ground Mounted And Overhead Signs To Be Upgraded.
ESTIMATE $ 6,700,000.00
A + B Bidding
ADVERTISE DATE 03/22/04
BID OPENING 05/06/04 07/29/04 09/23/04  10/14/04
FINAL POSTING 10/13/04    @   16:50

BID RESULTS
1 HANSON SJH CONSTRUCTION $ 6,134,753.20
105 DAYS
2 HAZARD CONSTRUCTION COMPANY $ 5,817,796.00
130 DAYS

The Caltrans District 11 Office is located at 2829 Juan Street, San Diego, CA 92110. The mailing address is P.O. Box 85406, San Diego, CA 92186-5406. The District 11 Duty Senior telephone number is (619) 688-6635. Please submit all inquiries in the proper format by fax to (619) 688-6988 or e-mail to:
Duty_Senior_Const_District11@dot.ca.gov.
The responses to bidder' inquiries, unless incorporated into a formal addenda to the contract, are not a part of the contract and are provided for the bidder's convenience only. In some instances, the question and answer may represent a summary of the matters discussed rather than a word-for-word recitation. The responses may be considered along with all other information furnished to prospective bidders for the purpose of bidding on the project. The availability or use of information provided in the responses to bidder' inquiries is not to be construed in any way as a waiver of the provisions of Section 2-1.03 of the Standard Specifications or any other provision of the contract, the plans, Standard Specifications or Special Provisions, nor to excuse the contractor from full compliance with those contract requirements. Bidders are cautioned that subsequent responses or contract addenda may affect or vary a response previously given.
Caltrans District 11 Construction Department has developed this method of answering Bidder's Inquiries to better serve the needs of the Contractors who bid on our Projects. Caltrans District 11 Construction Department will post all of the questions submitted by any of the contractors that are registered Planholders for that Contract, but reserves the right to not answer any questions deemed unsatisfactory for public viewing.
The BIDDER'S INQUIRIES & RESPONSES will be updated continuously and all attempts will be made to do the final posting by 15:00 on Wednesday prior to the bid opening.
INFORMATION AVAILABLE
 
BID ITEMS
 SPECIALS
PLANS
 PLANHOLDERS
         
ADDENDUM

 ADDENDUM NO.1 04/29/04
  ADDENDUM NO.2 06/09/04
 ADDENDUM NO.3 09/08/04
 ADDENDUM NO.4 09/17/04
 

BIDDER'S INQUIRY SUBMITTAL FORM
 

Inquiry No.
Inquiry
1
Q:04/08/04
    R:04/14/04
Plan Sheet / Specification Reference=Item 44, Replace Concrete Pavement.
Special Provision section10-1.36, same title.  Plan sheet 35 of 122, (C-8)

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.
2
Q:04/08/04
    R:04/14/04
Plan Sheet / Specification Reference=Item 27, Road Exc, Type Z-2, aerially
deposited lead.  Special provision section 10-1.29, pp3, page 156, lists 7
locations where this material exists. Plan sheet 66 of 122 lists 12
locations where this material exists.  The spec section describes the
material as existing betwee 0.0 m and 6.0 m, measured horizontally from the
edges of existing pavement, and from a depth of 0.0 m to 0.55 m below
existing grade, or as shown on the plans.  The referenced plan sheet gives
and offset from LOL and a depth of 450mm.  Plan sheet 8 of 122, (L-1),
legend contains a cross-hatch symbol with the note: "ASPHALT CONCRETE
("SD-5" LINE - 300 mm / "SD - 163" LINE - 260 mm) ROADWAY EXC (TYPE Z-2)
(AERIALLY DEPOSITED LEAD).

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.
 3
Q:06/08/04
R:09/07/04
Plan Sheet / Specification Reference=ITEM 44, Special Provisions section
10-1.36, page 182, sub paragraph entitled "Replacement Base Layer"

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. 
4
Q:07/15/04
     R:09/08/04
Plan Sheet / Specification Reference=Special Provision section 10-1.36,
sub-section, REMOVING EXISTING PAVEMENT AND BASE MATERIAL.  And Addendum 2, page 3 which sets out to clarify the apparent conflict in the original spec
and is listed as the answer to my earlier question about this spec section.

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.
5
Q:09/13/04
    R:09/16/04
Plan Sheet / Specification Reference= specials- section 10-1.35 seal pavement joint. last paragraph in the section starting with ' each lot of asphalt rubber joint sealant.....'

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.
 6
Q:09/15/04
R:09/17/04
Plan Sheet / Specification Reference=SPECIAL PROVISION SECTION 10-1.15,
MAINTAINING TRAFFIC VS SPECIAL PROVISION SECTION 5-1.04 PUBLIC SAFETY

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.
 
 7
Q:09/16/04
R:10/08/04
Plan Sheet / Specification Reference=Item 44, Replace Concrete Pavement,
RSC.  Special Provision Section 10-1.36

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.
Related to that question regarding thickness, there are two "Percentage pay
tables" for rapid strength concrete beginning on page 177, one for thickness
of pavement of less than 255mm and one for thickness of 255mm or greater.
Given that the total thickness is around 350mm but the thickness will be
achieved in two lifts of yet undertimed individual thickness, which table
applies?
 
  • Both tables apply.
Further, following both of these tables there are paragraphs headed by an
asterisk (*) stating that "Any replacement panels that develop one or more
transverse cracks within 21 days after replacement shall be removed and
replaced at the contractor's expense..."  The referenced asterisks seem to
be those in the 80% cells in the aforementioned percentage pay tables.  Does
this mean that ONLY panels that fall into the strength parameters defining
the 80% cells are subject to the removal requirement for transverse crack
requirement?  Conversely, does this mean that if the panels fall into the
strength parameters defining cells other than the 80% cells, they are NOT
subject to the removal requirement if they develop transverse cracks? Please
clarify.
  • 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.
 
  8
Q:09/29/04
     R:10/08/04
Plan Sheet / Specification Reference= specials- section 10-1.35 seal pavement joint. last paragraph in the section starting with ' each lot of asphalt rubber joint sealant.....'

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. 
9
Q:10/12/04
     R:10/13/04
Plan Sheet / Specification Reference= traffic chart #19

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.
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