BIDDER'S INQUIRIES & RESPONSES
DISTRICT 11 CONSTRUCTION

 
CONTRACT NO: 11-281604
ROUTE / KP 11-SD-5702
LOCATION In San Diego County In El Cajon At Bostonia Maintenance Station At 1463 East Broadway
DESCRIPTION Remediation Of Hydrocarbon Contaminated Soils.
ESTIMATE $450,000
WORKING DAYS

90

ADVERTISE DATE 04/27/2009
BID OPENING 5/29/2009, 5/28/2009
FINAL POSTING
05/27/09  @ 15:00 Hrs

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

Materials Information Handout
BID ITEMS
 SPECIALS
PLANS
 PLANHOLDERS


ORDERING PROJECT PLANS AND SPECIFICATIONS

Cost per set: Bidders: $20, Non-bidders: $13

ADDENDUM


Addendum 1, Plan Sheets

 

BIDDER'S INQUIRY SUBMITTAL FORM


Inquiry No.
Inquiry

   1

  Q:04/27/09
R:05/13/09

Plan Sheet / Specification Reference= license requirements

Question= you list the license requirements as: "A hazardous" or C-12

do you mean an General Engineering A license or c-12 with a hazardous substances endorsement? or sometimes referred to as an "haz" endorsement. technically. there is no such thing as a "A hazardous"

  • The licensing can be either C-12 or general engineering A with haz. endorsement.

 2

  Q:05/06/09
R:05/12/09

Plan Sheet / Specification Reference= license requirements

Question=will there be a site walk, if so when and where?

  • No site walk is planned.
    To arrange for a site visit call 760-594-2011

3

  Q:05/13/09
R:05/14/09

Plan Sheet / Specification Reference= 17, Roadway Excavation (Hydrocarbon Contaminated), Plan Sheet C-1, Section 10-1.15


Question: Cross Section A-A and B-B show a 15'feet deep excavtion with vertical sidewalls and no shoring shown.  Is the State expecting vertical sidewalls and therefore, shoring?  Or can the sidewalls be sloped to safe thus increasing quanaties of HMA and possibly import?

  • Please bid per current contract documents.
  • Please refer to sections 10-1.14 and 10-1.15 of the Special Provisions and Section 5-1.02A of the Standard Specifications.

4
 
Q:05/
14/09
R:05/14/09


Plan Sheet / Specification Reference=General


Question:Will subsurface information be made available?

  • It is available under the link marked "Materials Information Handout."
5
 
Q:05/
15/09
R:05/18/09

Plan Sheet / Specification Reference=


Question:Does this project require any of the large diameter auger borings as suggested in the Kleinfelder “Corrective Action Plan” dated December 16, 2004 or is this primarily an excavation project within the 40’ X 46’ area of concern as indicated in the Secor International, Inc. “Corrective Action Plan Addendum” dated January 4, 2007? Secor International, Inc. addendum report indicated 30’ X 40’ excavation area – please advise.

  • The Corrective Action Plan is for general information, we have to disclose it. Excavate as indicated on the plans, only.

6
 
Q:05/15/09

R:05/18/09

Plan Sheet / Specification Reference=


Question: From the layout offered in the plans it does NOT appear like the excavation extends into the roadway (East Broadway) – Is this correct? And if so what traffic control is required? I see traffic control specifications are provided can you be any more specific??

  •  It is correct, it does not extend into the roadway. These specifications are included in all projects.


7
 
Q:05/15/09
R:05/18/09

Plan Sheet / Specification Reference=


Question:As specified in Section 10-1.14 Earthwork is “Reinforcement or metal attached to reinforced concrete rubble placed in embankments shall not protrude above the grading plane” indicative of shoring/tight-sheeting around four (4) sides of the excavation? Please specify as it is not clear in either Section 10-1.14 or 10-1.15 or Section 19 “Earthwork.”.

  • Section 10-1.14 of the SSP's makes reference to embankment material. You have imported borrow to supplement contaminated removed material. Shoring is covered under Standard Specification 5-1.02A.



8
 
Q:05/15/09
R:05/18/09

Plan Sheet / Specification Reference=


Question:  I realize that soil contaminated with hydrocarbons will undergo waste characterization analysis BUT for bidding purposes how should liquids and solid waste streams be classified? Based on benzene concentrations solid wastes most likely will either be “non-RCRA hazardous waste (State of CA regulated)” or “Hazardous waste solids (D018)”  Would assume more or less the same for waste liquids.

  • The solids and liquids from the site should be considered non-RCRA hazardous for bidding purposes.

9
 
Q:05/
20/09
R:05/20/09

Plan Sheet / Specification Reference= Addendum 1


Question: It is my understanding that an addendum has been issued. Is this true?

  • Yes, an addendum has been issued and is available on the links posted above.
10
 
Q:05/
21/09
R:05/22/09

Plan Sheet / Specification Reference= General


Question:
The scope of work is slated for excavation for the remediation process. Will other methodologies be considered such as bio-remediation (Not Bio Venting or Spray and Pray but active control of the remediation process? If so then how would you like us to proceed with our bid?

  • No, Bid per current Contract documents.

11
 
Q:05/
22/09
R:05/27/09

Plan Sheet / Specification Reference=Corrective Action Plan, Amendment dated 2007 by Secor


Question: The Corrective Action Management Plan by Secor indicates that three trenches will be excavated to a depth of 12 feet below grade and backfilled with one sack sand/cement slurry to 6 feet below grade.  Is this a requirement of the contract? 

  • The Corrective Action Plan is for informational purposes only.
  • Please bid per current Contract documents.
12
 
Q:05/
22/09
R:05/27/09

Plan Sheet / Specification Reference=Dewatering


Question: Is it anticipated that the contractor shall completely dewater the excavation or just remove whatever water is capable of being extracted from the dewatering well.  Regardless, the excavation may remain saturated depending on the actual amount of groundwater encountered, and therefore, difficult to obtain 90% compaction effort.  Please clarify.

  • Please bid per current Contract documents.
  • Please refer to the Special Provisions, Section 10-1.04 TEMPORARY DEWATERING SYSTEM, Section 10-1.14 EARTHWORK, for excavation,  and placement per Standard Specifications Section 19, EARTHWORK.
13
 
Q:05/
22/09
R:05/27/09

Plan Sheet / Specification Reference= Section 10-1.15, Stockpiling of excavated material. Plan Sheet L-1


Question:

1) Can the tree in the middle of the property be cut down and removed?
  • No, we do not have environmental clearance to remove the tree.
  • Please bid per current Contract documents.
2) With regards to "Stockpiling of Excavated Material"-What is meant by 1 inch thick polyethylene? This would not be flexible at ALL to use as a base layer and/or cover for the stockpile-Is this a misprint?? Maybe two (2) layers of 20 mil or 30 mil HDPE base and 10 mil for cover??

  • Typo, use 30 10 mils thick, polyethylene membrane.

3) What will be done with the overhead utilities-primarily telephone in the area designated for the new drive? Can the building immediately west of the proposed new drive be removed also, along with the metal shed, to provide a wider berth onto the property?


  • Overhead utilities do not interfere with the entrance to the driveway. No, the building west of the drive way will not be removed. Refer to the Special Provisions and the Contract plans, for removal of the metal shed.

4) Will the sidewalk need to be closed for the duration of the project and will the bus stop near the proposed new drive need to be moved?

  • No, the sidewalk is to remain open, bus stop to remain.
  • Please bid per current Contract Documents.

14
 
Q:05/
26/09
R:05/27/09

Plan Sheet / Specification Reference= Section 10-3 Signals, Lighting & Electrical Systems, Page 40, Subheading 10-3.02, Maintaining Existing Traffic Management System Elements during Construction.


Question:

1) Are there any TMS elements within the project limits? Of so, where?

  • No TMS within project limits.

2) Should an allotment be made for pre-constrcution operational status check?
If so, how much?

  • Bid pricing is the Contractors choice.

15
 
Q:05/
26/09
R:05/27/09

Plan Sheet / Specification Reference=Item Number 17 Roadway Excavation (Hydrocarbon Contamtination)



Question: Question=These Questions were submitted on May 18, 2009.  There have not been posted to the website.  Here they are again.:

  • (No Record of submittal on May, 18, 2009)

1.      The Cross Sections A-A and B-B indicate that 618 cubic yards and 341 cubic yards of reusable and contaminated soils respectively will be excavated.  However the stockpile areas indicated on Layout L-1 will only accommodate approximately 200 cubic yards and 30 cubic yards respectively.  Please indicate how this discrepancy is proposed to be handled by the State.

  • Bid per current Contract documents.

2.      In Special Provision 10-1.15 Stockpiling of Excavated Material it is indicated that the stockpile material shall be on two layers of 1-inch thick (minimum) black polyethylene and shall be covered by 1-thick (minimum) black polyethylene.  It appears that the thickness is a mistake.   It is not practical to obtain and use 1-thick polyethylene sheeting.  Please clarify this issue.

  • Typo, use 30 10 mils thick, polyethylene membrane.

3.      In Special Provision 10-1.15 Sampling and Analysis Requirements the type of testing to be conducted is outlined, but no indication of the quantity of samples that should be taken and tested is provided.  In addition, no standards with respect as to what is acceptable for reuse are provided other than the statement that “contamination concentrations are less than levels requiring special handling and disposal by applicable regulatory agencies”.  Since the listed “applicable” regulatory agencies have different standards depending on site end-use and exposure risks, please provide guidance on these issues for bidding.

  • The contractor can reference the local agency, San Diego County Department of Environmental Health(DEH), for sampling guidelines and handling and disposal requirements.
  • Bid per current Contract documents.

4.      The Special Provisions and Plans do not indicate sampling of the excavation sidewalls or bottom to verify that all of the contaminated materials have been removed.  Is testing of the excavation sidewalls and bottom going to be required of the Contractor or is the State planning to conduct the testing itself?

  • Bid per current Contract documents.

5.      By virtue of the dewatering system it is anticipated that during the excavation water will be encountered.  This will lead to a soft excavation bottom.  The Special Provisions in Section 10-1.14 exclude the use of man-made materials for stabilization of the bottom.  This implies a gravel or rock bottom stabilization.  Please provide guidance on what is acceptable backfill stabilization and to what height above the water-impacted bottom does the stabilized material need to extend. 

  • Bid per current Contract documents.


16
 
Q:05/26/09
R:05/27/09

Plan Sheet / Specification Reference= 17, Roadway Excavation (Hydrocarbon Contaminated), Plan Sheet C-1, Section 10-1.15


Question:

1) It is probable that workers will have to work in the bottom of the excavation. Safe sloping is not possible because of existing conditions. Shoring will likely be necessary. Under what line item will the shoring be paid?
  • Please refer to Section 10-1.14 Earthwork of the Special Provisions which references Section 19 “Earthwork”, 19-1 General, of the Standard Specifications, refer to Section 19-1.02 Preservation of Property. If necessary it should be be included under the item of work for roadway excavation.
2) Should we assume the drilling/excavation necessary to install the shoring will be uncontaminated material?

  • Bid per current Contract Documents.

3) Can we expand the designated stockpile areas where possible and needed?

  • Bid per current Contract Documents.

17
 
Q:05/XX/09
R:XX/XX/XX

Plan Sheet / Specification Reference=


Question:

 


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