BIDDER'S INQUIRIES & RESPONSES
DISTRICT 11 CONSTRUCTION
CONTRACT NO: 11-284604
ROUTE / KP 11-SD-5-R23.9/R28.2
LOCATION In San Diego County In San Diego From Mission Bay Drive Overcrossing To Nobel Drive Overcrossing
DESCRIPTION Upgrade Median Guardrail To Concrete Barrier.
CONTRACT TYPE A + B Bidding
ESTIMATE $6,500,000
WORKING DAYS

520
ADVERTISE DATE 06/07/2010
BID OPENING 07/08/2010
FINAL POSTING
07/06/2010 @ 12:30

Bid Summary

The Caltrans District 11 Office is located at 4050 Taylor Street, San Diego, CA 92110. 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
INFORMATION HANDOUT

X-SECTIONS

ORDERING PROJECT PLANS AND SPECIFICATIONS   

Cost per set: Bidders: $E-ad, Non-bidders: $E-ad

ADDENDUM

 

BIDDER'S INQUIRY SUBMITTAL FORM
Inquiry No.
 Inquiry

   1

  Q:06/22/10
R:06/29/10

Plan Sheet / Specification Reference= BID ITEM NO.36 CLASS 2 AGGREGATE BASE
SHEET C-5 SECTION B-B


Question= HOW IS THE CLASS 2 BASE UNDER THE TYPE 60SC MOD. BARRIER BEING
PAID?

  • Class 2 is paid for as specified in the Special Provisions. 

  2

  Q:06/22/10
R:06/23/10

Plan Sheet / Specification Reference= Item 37, CEMENT TREATED BASE, PLAN SHEETS: 2,3,110,& 111


Question= There is an item (#37, CEMENT TREATED BASE) that is defined in the special provisions but does not appear to be called out on the typical sections nor on the summary of quantities. There is a product, Concrete base, that is defined in the special provisions and is called out on PLAN SHEETS: 3 & 111, for which there is no bid item. Please clarify.

 

  • The Cement Treated Base (CTB) is shown on plan sheet C-6, or sheet No. 37, under the "CTB Detail". CTB is also called out in the Summary of Quantities sheet Q-2, or sheet No. 110 under the "Cement Treated Base" table. CTB is also in the Special Provisions section 10-1.35 or page 108. For Concrete Base, the Special Provisions (Section 10-1.36 or pages 108 and 109) states in the last paragraph, "Full compensation for concrete base is included in the contract unit price per linear foot for concrete barrier and no additional compensation will be allowed therefor." Since Concrete Base is fully compensated under the concrete barrier item, Concrete Base is called out as a Non-paid item on sheet Q-3, or sheet No. 111.
     

  3

  Q:06/25/10
R:06/29/10

Plan Sheet / Specification Reference= PLAN SHEET 104, TRAFFIC HANDLING DETAILS, indicates by typical section that the median side of the temp K-rail will be between 1' and 7' away from the median onto the existing concrete pavement inside the existing travelled lanes. This section also provides that the distance between the median face of the temp k-rail and the outside face of the new concrete barrier rail will allow for working room of not less than 11'.


Question= Please confirm that this is the correct interpretation of these plans.

 

  • Interpretation is correct.


 

  4

  Q:06/25/10
R:06/29/10

Plan Sheet / Specification Reference= ITEMS 49-53, CONCRETE BARRIER. Section 10-1.50,"CONCRETE BARRIER", second paragraph, states "Concrete barriers shall be constructed on a layer of Class 2 Aggregate Base as shown on the plans." Plan sheet 3, TYPICAL CROSS SECTIONS, X-2, depicts the concrete barrier from southbound station 1314+00 to 1389+00 as constructed on a 0.15' layer of concrete base. Plan sheet 2, TYPICAL CROSS SECTIONS, X-1, NOTE 4, states "EXACT LOCATIONS AND TYPE OF CONCRETE BARRIER ARE SHOWN ON THE LAYOUTS AND SUMMARY OF QUANTITIES SHEETS". Plan sheet 110, SUMMARY OF QUANTITIES, Q-1, contains a column of quantities indicating that the concrete barrier on the southbound roadway from station 1297+00 to 1393+50 as constructed on a 0.15' layer of HMA.


Question= The contract documents differ between Class 2 AB, Concrete base, and HMA for this particular run. PICK ONE.

  • Base is to be placed under the concrete barrier as shown on the typical sections. Payment is per the special provisions.

     

  5

  Q:06/30/10
R:07/01/10

Plan Sheet / Specification Reference= Items 36, CL 2 AGG BASE; 39, HMA; and 45, 24"ACP. PLAN SHEET 3 (X-2), PLAN SHEETS 62,63,64 (D-3,4,5),PLAN SHEET 90, (DQ-1),and PLAN SHEET 110 (Q-2)


Question= The drainage plans depict DU 3,4,5 being constructed in the shoulder of the southbound roadway in an alignment that falls under the existing paved shoulder. The typical sections indicate that the existing pavement section is 0.25'AC,VAR CLASS 2 AB, 1.60' CLASS 5 AS alongside an apparently equal depth of main roadway section that is a total of 3' of PCC, CTB, AB, & AS. The total length of 24" APC drainage pipe to be placed under this shoulder is approximately 1,665' with an average width of approximately 3'. This will require a substantial amount of rebuilding of the structural section of the shoulder upon completion of the installation of the APC drainage pipe. PLAN SHEET 110 (Q-2) and the bid quantity listing do not include any quantity of CLASS 2 AB or HMA for these areas.

The questions are:What structural section is required to be installed as the replacement over the pipe areas? Is this material to be measured for payment as a line item?

  • Structural section over pipes is to be the same as the proposed structural section shown on Typical Cross Section (X-1). Payment will be made per Standard Specification and the contract special provisions.

 

  6

  Q:07/02/10
R:07/06/10

Plan Sheet / Specification Reference= Item # 24 & 27 (Type Z-2 Aerially Deposited Lead) 

Question= After reviewing the Materials Information, the Special Provisions and the costs associated with the requirement to dispose of the material at a Class 1 Landfill we would request that you clarify the
following related to these bid items:

1. Please confirm that the material can be left on site if it is encapuslated with one (1) foot of clean material.

  • Per Section 10-1.30 "MATERIAL CONTAINING HAZARDOUS WASTE CONCENTRATIONS OF AERIALLY DEPOSITED LEAD" of the Special Provision, type Z-2 is hazardous waste regulated by the State of California and shall be transported to and disposed of at a Class I Disposal Site.


2. There is no indication on the profile sheets as to where the vertical or horizonatal limits of the aerially deposited lead are located. The material handout indicates that all the excavation contains aerial lead
that is not under existing asphalt. If that is the case the quantities do not appear to be correct. Please clarify

  • Type Z-2 material exists throughout the project limits from Station 1306+27 to Station 1519+17 in the northbound direction and from Station 1297+00 to 1519+13.99 in the southbound direction. A depth of 1.5 feet below existing grade is used for the type Z-2 material. The quantities on the plan sheets are correct.


3. With no Class I landfills in San Diego or adjacent Counties can the contractor bury the material on another Caltrans project? If so where?

  • No. Please bid per current contract documents.


4. Who will be responsible for characterizing the material and determining the depth of the removal as it is a variable depth in the special provisions.

  • Please see answer for question # 2.


5. If the contractor ends up being responsible for the characterization process can the bid quantity be changed to tons in lieu of yards as that will be how the disposal fees are assessed?


  • No. Please bid per current contract documents.

 

  7

  Q:07/02/10
R:07/06/10

Plan Sheet / Specification Reference= ITEM 36, CLASS 2 AGG BASE; ITEM 39 HOT MIX ASPHALT,ITEM 53 CONCRETE BARRIER 60 SC MOD.

Question= Reference is made to Question #5, (Q:6/30/10, A:7/01/10). Thank you for your clarification of the structural section to be constructed over drainage pipes.  Regarding payment, we interpret the preponderance of the referenced contract documents to require measurement and payment for the placement of the specified structural section as cubic yards of Class 2 Aggregate Base under contract item #36, and tons of Hot Mix Asphalt under contract item #39.  Please confirm that this is the correct interpretation as the summary of quantities (plan sheets 109-111) do not contain sufficient detail to confirm or deny this interpretation.

  • Interpretation is correct.

 

 8

  Q:07/02/10
R:07/06/10

Plan Sheet / Specification Reference= Item 24, Roadwayway Exc Type Z-2 (Aerially Deposited Lead), Special Provisions section 10-1.30

Question= Please refer to Special Provision Section 10-1.30, 3rd paragraph, 2nd sentence reads " Type Z-2 material exists throughout the project limits except in the northbound direction, from Station 1294+93 to Station 1306+27, and from a depth of 0 feet to 1.5 feet below existing grade, as shown on the plans". Does this mean that Type Z-2 material does not exist in the north bound direction at all? or between the specified station in either the NB or SB direction? Please reword this senctence to better define where Type Z-2 material does not exist.

It does not appear that limits of Roadwayway Exc Type Z-2 (Aerially Deposited Lead) are properly defined on the plans. Please define these limits and revise sheet Q-1 to show specifically by stations where Type Z-2 matarial exists.



  • Please see inquiry # 6 above.

 

 


OTHER LINKS OF INTEREST
DISTRICT 11 CONSTRUCTION BIDDER'S INQUIRIES & RESPONSES
DISTRICT 11 HOMEPAGE
CALTRANS OFFICE ENGINEER: Contract Advertisement, Special Provisions, Plan Holders, Contract Awards, etc.
DEPARTMENT OF TRANSPORTATION