BIDDER'S INQUIRIES & RESPONSES
DISTRICT 11 CONSTRUCTION


CONTRACT NO: 11-167894
ROUTE / KP 11-Imp-78,86-R14.6/R19.5,38.3/39.1
LOCATION In Imperial County Near Brawley On Route 78 From Route 86 To 0.6 Km East Of Hovley Road And On Route 86 From 0.5 Km South To 0.1 Km North Of Fredricks Road.
DESCRIPTION Construction Of A New 4-lane With Hma And Crcp.
ESTIMATE $32,000,000
WORKING DAYS

415

ADVERTISE DATE 06/21/2010
BID OPENING 08/12/2010
FINAL POSTING
08/11/2010 @ 12:20

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 the day prior to the bid opening.


INFORMATION AVAILABLE



BID ITEMS
 SPECIALS
PLANS
 PLANHOLDERS
INFORMATION HANDOUT
X-SECTIONS

X-SECTIONS
07/2
1/2010


ORDERING PROJECT PLANS AND SPECIFICATIONS   

5% UDBE Requirement * Cost per set: Bidders: $E-ad, Non-bidders: $E-ad

ADDENDUM


PLANS
FOR ADDENDUM 1
07/29/2010

REVISED FEDERAL WAGE SHEET
PER ADDENDUM 1
07/29/2010

BIDDER'S INQUIRY SUBMITTAL FORM


Inquiry No.
Inquiry

   1

  Q:07/12/2010
R:07/29/2010

R:08/09/2010


Plan Sheet / Specification Reference= Bid Item 39


Question= In the Material Handout Caltrans refers to their Borrow Source (SMARA Permit # 91-13-0052). Please provide the following:

1. Location; Thomas Bros Coordinates,physical directions or GPS Coordinates

  • OCOTILLO, Latitude 32.56778 and Longitude -116.00861.

2. Permit Restrictions if any

  • Please contact County of Imperial Planning Department.

3. Borrow Site Plan the contractor will be obligated to follow if any

  • None

4. Reclamation Plan the contractor will be obligated to follow if any

  • Yes

5. Any all fees the contractor will be obligated to pay

  • Please refer to section 7-1.04 "Permits and Licenses" of the Standard Specifications.

 

  • Contact information is in the reference website.

   2

  Q:07/13/2010
R:08/09/2010

Plan Sheet / Specification Reference= Bid Item # 88 Prefabricated Vertical Drains


Question= The plans call for the vertical drain material to be cut off at OG. There is no gravel, piping or filter fabric indicated on the drawings. Please confirm the bidders are not to include any gravel, filter fabric or drainage piping for the water to drain through during the subsidence phase or the ultimate location of the abutments.  
 

  • Please bid per the current contract documents. Based on the Kalin Rd UC Foundation Report (dated May 18, 2009), in the Information Handout, Bidders are not to include any cost for gravel or filter fabric for the water to drain through during the settlement/primary consolidation phase of the abutments. However, drainage piping for the water to drain through during the settlement/primary consolidation phase of the abutments are at contractor's option and if used will be at contractor's expense.

   3

  Q:07/13/2010
R:07/29/2010

Plan Sheet / Specification Reference= Bid Item # 107 the React 9cbb


Question= Will Caltrans accept post bid CRIPs for bid item 107 to substitute SCI-100 Smart Crash Cushion in lieu of the React 9cbb?
 

  • No. Please refer to section 5-1.14 of the Standard Specfication.

   4

  Q:07/13/2010
R:07/29/2010

Plan Sheet / Specification Reference=Bid Item # 39 Imported Borrow


Question= The Q Sheet Quantities appear to be short if you extend the math. The amount short appears to be appproximately the subsidence quantity. Please clarify 
 

  • Quantities are correct, please bid per current Contract Documents.

 

   5

  Q:07/13/2010
R:07/21/2010

Plan Sheet / Specification Reference=Cross Sections - PDCL1 and CWNCL1 Lines


Question= The PDCL1 Line of the cross sections appears to be missing cross sections from 183+30-187+20. Will those cross sections be made available?

The CWNCL1 Line says there is 70 sheets, however the cross sections stop at sheet 52. Is 52 the correct number of sheets, or are we missing some of those sheets?

  • Additional cross-sections have been added to the link X-SECTIONS 07/21/10 above.

 

 6

  Q:07/13/2010
R:07/29/2010

R:08/09/2010

Plan Sheet / Specification Reference= IID Utility Irrigation Relocations


Question=There is no schedule or availability related to IID facility relocations. Please provide relocation availability times if they will not relocate per the bid documents.

  • Please bid per current contract documents.
  • Please refer to Section 5-1.17 "NONHIGHWAY FACILITIES (INCLUDING UTILITIES)" of the special provisions.

 

 7

  Q:07/13/2010
R:07/30/2010

Plan Sheet / Specification Reference=Bid Item 39


Question=1. Are there any designated borrow sites for this project?

  • There are optional borrow sites in this project. Refer to Information handout and addendum #1



2. Is the Caltrans Ocotillo site a mandatory designated site?

  • No mandatory borrow sites for this contract.


3. If a farmer or any other entity is issued a grading permit from Imperial County for whatever reason which results in export from that site will that negate the SMARA requirement as far as Caltrans is concerned?

  • Contact the California Department of Conservation regarding any of their requirements.


4. Caltrans had two designated sources for the previous project. Have those sources been exhausted?

  • Refer to information handout and addendum #1 for optional borrow sites.


5. The BLM routinely issues Borrow Site Permits in Imperial County. If the BLM issues a royalty permit for borrow material will that negate the SMARA requirement as far as Caltrans is concerned?

  • See #3 above.

 


6. Will the contractors be allowed to haul through the current project (11-167884) by February 2011, in order to avoid having to haul through Brawley if the contractors borrow source is South and or East of Brawley?

 

  • NO

 8

  Q:07/13/2010
R:07/30/2010

Plan Sheet / Specification Reference= bid item number 69(f)Structural concrete bridge footing.


Question= Can you please revise the bid item quantity? it is short by approx. 20%.

  • Refer to Addendum No. 1 dated July 29, 2010.

 9

  Q:07/13/2010
R:07/30/2010

Plan Sheet / Specification Reference= bid item 70(f) sheet 306


Question= Sheet 306 deck contour plans, the contour line elevations are in conflict with the written BB elevations. which is correct?

  • The written BB/EB elevations are CORRECT.

 10

  Q:07/19/2010
R:07/30/2010

Plan Sheet / Specification Reference= BId # 59 Continuously Reinforced Concrete Pavement Wide Flange Beam Terminal. sheet 69


Question= The plan view detail on sheet 69 shows the wide flange beam detail running continuously through the graded median or from one side of the freeway to the other. Is this what Caltrans intends. Also under what item is the lean concrete base material to be paid?

 

  • Wide Flange should run from EP to EP on both sides. See addendum #1 for payment clause of the lean concrete base.

 

 11

  Q:07/20/2010
R:07/30/2010

Plan Sheet / Specification Reference= Item 39, Imported Borrow, special provisions section 10-1.31 "EARTHWORK", states "The portion of imported borrow placed with 1.5 m of the finished grade shall have a Resistance (R-Value) of not less than 10."


Question= What quality requirements, if any, are imposed on imported borrow placed in the planned embankment other than the portion of the subgrade under the first layer of structural section material necessary to comply with the 1.5 meter specification in the referenced section. We do not see any quality requirements for material placed elsewhere. Please clarify.

  • Please refer to Addendum 1 dated July 29, 2010.

 

 12

  Q:07/20/2010
R:07/29/2010

Plan Sheet / Specification Reference= Item 33, ROADWAY EXCAVATION.  Plan sheet X-1 (sheet 2 of 325) has a call out for "300 mm FOUNDATION TREATMENT".  Plan sheet Q-1 (sheet 233 of 325) under "EARTHWORK QUANTITIES" has a row entitled "FOUNDATION TREATMENT" with a quantity listed of 34,600 under the column entitled "ROADWAY EXCAVATION (m3)".


Question= We find nothing in the specifications defining a procedure "FOUNDATION TREATMENT" nor defining means of measurement and payment.  Please define the operational procedure called out as "300 mm FOUNDATION TREATMENT" and verify that it is to be measured and paid as cubic meters of ROADWAY EXCAVATION.

 

  • FOUNDATION TREATMENT is the removal of 300 mm of material below OG and replacing it with embankment material

 13

  Q:07/20/2010
R:07/29/2010

R:08/09/2010

Plan Sheet / Specification Reference= page 147 last sentance for mesurement and payment of continuously reinforced concrete pavement. States full compensation for epoxy coating of reinforcing steel is to be paid per cubic meter for continuously reinforced concrete pavement.


Question= There is nothing showing epoxy coated rebar any where on the plans or in the spec's other then this sentence. Is all of the reinforcing steel for the continuously reinforced concrete pavement to be epoxy coated?

 

  • Please refer to Section 10-1.47 "CONTINUOUSLY REINFORCED CONCRETE PAVEMENT" and Section 11 "MODIFIED STANDARD SPECIFICATION SECTIONS" 40-2 "MATERIALS" of the Special Provisions.

 14

  Q:07/20/2010
R:07/29/2010

Plan Sheet / Specification Reference= Item 33, ROADWAY EXCAVATION, plan sheets PS-1 thru PS-14 (30 thru 43 of 325)and plan sheets G-12,G-13,& G-14.


Question= The roadway excavation quantities listed on the PS (1-14) sheets agree fairly well with the quantities listed on the Q sheets but differ greatly from the information presented on the G (12-14)sheets. The PS sheets list approximately 275,000 cubic meters of excavation between stations 199+55 and 206+20. The G sheets depict original ground elevations and finish grade contours that yield a volume of approximately 440,000 cubic meters for the same region when calculated. Which volume is correct? Which plan differs from the actual site condition?

 

  • Original Ground shown is prior to stage 2 construction, PS sheets are correct.

 15

  Q:07/20/2010
R:07/29/2010

Plan Sheet / Specification Reference= Item 33, ROADWAY EXCAVATION, plan sheet X-1, have call outs for "300 mm FOUNDATION TREATMENT" where the planned subgrade elevation is higher than exiting original ground.


Question= What is the plan for any "FOUNDATION TREATMENT" when all or part of the planned subgrade elevation falls below original ground between 0 and 300mm, and greater than 300mm?

  • FOUNDATION TREATMENT applies to locations shown on the plans regardless if original ground is below or above subgrade

 16

  Q:07/29/2010
R:08/02/2010

R:08/09/2010

Plan Sheet / Specification Reference= Special Provisions Section 10-1.41, page 124


Question= Section 10-1.41, of the project special provisions, makes reference to California Test 371, historically projects, bidding and build, in the lower desrt area requiring aggregates incorporated in hot
mix asphalt have not specified the use of Test 371. Is California Test 371 applicable to this project?

  • Please bid per current contract documents.
  • Not required for aggregates with known history.

 17

  Q:07/29/2010
R:07/30/2010

Plan Sheet / Specification Reference= Item 33, Roadway Excavation, plan sheets X-1,X-2.X-3.X-4, These sheets depict a 2.0 meter wide trapezoidal shaped ditch along the toes of embankment on the 'P' line of unknown depth, and a 'V' shaped ditch along the toes of embankment on most other lines.


Question= What depth are these ditches? How are they paid? There is no "Ditch Excavation" item. Is the volume of these ditches included in the calculated volume of roadway excavation per Section 19-4.03, third paragraph, of the Standard Specifications?

  • Depth of ditches are shown on the X-sections provided, and it is paid as roadway excavation because it is part of the roadway prism as shown in standard plan A62A.

 

 18

  Q:07/29/2010
R:08/06/2010

Plan Sheet / Specification Reference=Reference Plan Sheet No. 2 of 325.


Question= Reference Plan Sheet No 2 of 325 - detail approximately mid page titled "HMA Dike Placement on PCC". This detail calls for structural section No. 1 to be widened 0.2m outside the ES where HMA dike is to be placed. Please confirm that the intent is to widen the CRCP 0.2m in areas where HMA dike is to be placed.

  • Yes, confirmed.

 19

  Q:07/29/2010
R:08/06/2010

R:08/09/2010

Plan Sheet / Specification Reference= Reference Plan Sheet No. 9 of 325.


Question= At approximately Sta 158+00.947 "P" and 397+78.919 "N" on plan sheet 9 of 325, there is a call out for Structural Section No. 1 at the intersection of Route 78 and Route 86. Is the intent to place CRCP in that intersection? If so, please provide a joint layout and limits of the CRCP.

  • Please bid per current contract documents.
  • Yes. CRCP is required through the intersection as shown on the layout sheets. Joints will be required at limits shown on plans per construction detail sheets.

 20

  Q:07/30/2010
R:08/02/2010

Plan Sheet / Specification Reference=Item #13 Temp Hydraulic Mulch, Section 10-1.04 Pg65, 66


Question= 1. Summary and materials specify a tackifier; application specifies wood and cellulous fiber. Are we to use just the wood fiber?

  • The contractor is given the option to use wood fiber, cellulose fiber, alternate fiber, or a combination of these fibers that meet the criteria stated in Section 10-1.04 "Temporary Hydraulic Mulch" of the special provisions. A tackifier is also required by the same section 10-1.04 of the special provisions.

 

 21

  Q:07/30/2010
R:08/02/2010

Plan Sheet / Specification Reference= Item #40, Erosion Control BFM Section 10-1.34 pg 118-120


Question= 1. Regarding a BFM in 2 application process; 2 application usually done to include a seed but find no seed specified so are you not including seed? If no seed why two applications?

  • The two applications without seeding are needed because the material will be applied from 2 or more directions per Section 10-1.34 "EROSION CONTROL (BONDED FIBER MATRIX)" of the special provisions to achieve a continuos mat (page 119, under Application).

 

 22

  Q:07/30/2010
R:08/09/2010

Plan Sheet / Specification Reference= ITEM 39, IMPORTED BORROW


Question= REFERENCE BIDDERS INQUIRY NO. 1, (7/12/2010) RESPONSE (7/29/2010). The response is non-responsive. What website? If the "reference website" is meant to be the CONSERVATION website listed on page 6 of the original MATERIALS INFORMATION BROCHURE, that website deals with hundreds, if not thousands, of SMARRA sites, issues, rules, and regulations. The 3098 list available on the website only reveals the location of this site as "OCOTILLO". We could not find information regarding location of SMARA 91-13-0052 on the website nor on the latest version of the ACTIVE SURFACE MINING OPERATIONS MAP provided by the Planning & Development Services Department of the County of Imperial. Further, the "ADDITIONAL INFORMATION HANDOUT" included with Addendum #2 makes reference to a site identified only as "DUTTON" MATERIAL SITE, with no further coordinating identifying information. Is "DUTTON" the same as SMARA 91-13-0052? Please provide some usefull information regarding the State borrow sites (or site).

  • Dutton Parcel is parcel 34423 as shown on the Keymap and its included as part of the project.

 23

  Q:07/30/2010
R:08/06/2010

 

Plan Sheet / Specification Reference= ITEM 33, ROADWAY EXCAVATION, specifically FOUNDATION TREATMENT


Question= INQUIRY #12 (7/20/2010 RESPONSE (7/29/2010) and INQUIRY 15 (7/20/2010) RESPONSE (7/29/2010)address this issue but fail to resolve all concerns regarding procedure and payment. We conclude from the information provided in the bid documents and the answers provided to the above stated inquiries, and our previous experience that FOUNDATION TREATMENT is an operation wherein the native, in-situ earthen material is excavated for a depth of 300 mm below existing original ground or subgrade, whichever is lower, and re-used in ordinary embankment somewhere on the project; and the volume thus excavated and re-used will be measured and payment will be made therefor as contract item 33, ROADWAY EXCAVATION. Please confirm.

  • Yes, confirmed.

 

 24

  Q:07/30/2010
R:08/09/2010

 

Plan Sheet / Specification Reference= Addendum 1 and Information Handout, Materials Information


Question= Addendum 1 and accompanying Information Handout references optional sites for Imported Borrow. How does ValRock, a subsidiary of Vulcan Materials Co., also get referenced as an optional site as we have sites also available and supplied Imported Borrow as well as other materials to the previous phase (11-167884)

  • Comment noted.


 25

  Q:07/30/2010
R:08/09/2010

R:08/09/2010

 

Plan Sheet / Specification Reference= ITEM39, IMPORTED BORROW, Special Provisions section 10-1.31 EARTHWORK


Question= The referenced section of the special provisions of the contract documents, as modified by addendum #1, dated July 29, 2010, provides that the "Embankment material within 0.8 meters of the finished grade shall have a sand equivalent (SE) between 10 and 45." The only definition of "finished grade" that we can find in the contract documents is provided in the Standard Specifications, Section 19-1.01 DESCRIPTION, paragraph 2, "Whenever reference to finished grade is made, it shall be considered to be the finished surface of the completed facility." We conclude that the only quality requirement for imported borrow placed in embankment volumes not reserved for material of the SE range stipulated below is found in the Special Provisions, Section 10-1.31 EARTHWORK, ninth paragraph; and the Standard Specifications, Section 19-7.01 IMPORTED BORROW, second paragraph. Further, we conclude that there the added contract requirement applicable to the material placed in any embankment, anywhere on the project, including the top 35mm of subgrade in paved areas designated as typical structural section #1, (no portion of the subgrade of paved areas designated as typical structural section #2), all medians, shoulders, and embankment slopes, of all roadways constructed under this contract, including the mainline of routes 78 & 86, frontage roads, connector roads, and surface roads is the SE range of between 10 and 45. Further, we conclude that any and all roadway excavation developed in the construction of the project must be placed in embankment locations not reserved for material of the SE range stipulated above. Please confirm.

  • Yes, confirmed.
  • Roadway excavation material generated as part of the project meeting contractual requirements for SE may be utilized for embankment.


 26

  Q:07/30/2010
R:08/09/2010

R:08/09/2010

Plan Sheet / Specification Reference= ITEM39, IMPORTED BORROW, Special Provisions section 10-1.31 EARTHWORK


Question= The referenced section of the special provisions of the contract documents, as modified by addendum #1, dated July 29, 2010, provides that the "Embankment material within 0.8 meters of the finished grade shall have a sand equivalent (SE) between 10 and 45." The only definition of "finished grade" that we can find in the contract documents is provided in the Standard Specifications, Section 19-1.01 DESCRIPTION, paragraph 2, "Whenever reference to finished grade is made, it shall be considered to be the finished surface of the completed facility." We conclude that the only quality requirement for imported borrow placed in embankment volumes not reserved for material of the SE range stipulated below is found in the Special Provisions, Section 10-1.31 EARTHWORK, ninth paragraph; and the Standard Specifications, Section 19-7.01 IMPORTED BORROW, second paragraph. Further, we conclude that there the added contract requirement applicable to the material placed in any embankment, anywhere on the project, including the top 35mm of subgrade in paved areas designated as typical structural section #2, (no portion of the subgrade of paved areas designated as typical structural section #1), all medians, shoulders, and embankment slopes, of all roadways constructed under this contract, including the mainline of routes 78 & 86, frontage roads, connector roads, and surface roads is the SE range of between 10 and 45. Further, we conclude that any and all roadway excavation developed in the construction of the project must be placed in embankment locations not reserved for material of the SE range stipulated above. Please confirm.

  • Yes, confirmed.
  • Please refer to Addendum No. 1, all of section 10-1.31 "EARTHWORK" of the special provisions and section 19 "EARTHWORK" of the standard specifications.


 27

  Q:08/02/2010
R:08/09/2010

R:08/09/2010

Plan Sheet / Specification Reference= ITEM 108, CONCRETE BARRIER (TYPE 60)


Question= Plan sheet C-13 (65/325) shows the concrete barrier on "FG". The standard plan A76A shows CONCRETE BARRIER TYPE 60 on "Pvmt or well compacted base". What is required on this contract, pavement of some kind or well compacted base of some kind? If either pavement or base is required, what is the typical section detail and what is the basis for measurement and payment?

  • Where barrier is on pavement, pavement is paid as structural section. Where barrier is on soil, soil is compacted to 90% in accordance with section 19-5 "COMPACTION" of the standard specifications.

 

 28

  Q:08/02/2010
R:08/09/2010

Plan Sheet / Specification Reference= 54, Continuously Reinforced Concrete Pavement,plan sheet 67


Question= Per construction details on C-15 for the Continuously Reinforced Concrete Pavement, the contractor is provided an alternate Longitudinal Construction Joint detail that shows the installation of a full length tiebar in lieu of the multi-piece tiebar option.   In this detail, the tiebar is shown to be installed at D/2 from the top of the concrete pavement, which would be 130 mm (D = 260 mm).  From Table 1, the X distance (distance from the top of concrete to top of reinforcing mat) is shown to be 102 mm for this paving depth.  With the top mat of longitudinal reinforcement being 19 mm thick, the centerline of the transverse reinforcement will be at the 130 mm distance also (102 mm + 19 mm + 19 mm/2), which is an exact fit for these tiebars.  But when tolerances for the installation of the reinforcing, bar sized fluctuations, and variability in the subgrade below the concrete are experienced, the 130 mm dimension can not be maintained. This will only be discovered after the concrete has been placed.   Will Caltrans allow the tiebars to be installed at a depth from the top of concrete of at least 155mm to allow the alternate to be utilized or will Caltrans require multi-piece tiebars to be installed?

  • Bid to comply with applicable tolerances specified by contract. Utilize methods that will meet the contractual requirements considering the appropriate tolerances.

 

 29

  Q:08/03/2010
R:08/06/2010

R:08/09/2010

Plan Sheet / Specification Reference= Contract Plan Sheet 4 of 325.


Question= Reference the Southbound typical section for Route 86 shown on plan sheet 4 of 325.
1. Is the longitudinal joint between the existing PCC and the new CRCP to be an Isolation Joint as shown on RSP P18 Detail A? If so, where is the work for the isolation joint to be paid? Typically there is a bid item for Seal Longitudinal Isolation Joint.

  • Please bid per current contract documents.
  • Yes an isolation joint will be required. Please refer to section 11, subsection 40-4.02 "PAYMENT" of the special provisions.

2. Will a 1 meter wide grind along the edges of the existing PCC be required where the new CRCP ties into the existing PCC? If so, where is the PCC grind work to be paid? Typically there is a bid item for Grind Existing PCC.

  • Please bid per current contract documents.
  • Grinding may be required per section 11, subsection 40 of the special provisions and payment under subsection 40-4.02 "PAYMENT" of the special provisions.

 

 30

  Q:08/03/2010
R:08/09/2010

Plan Sheet / Specification Reference= STAGING PLANS PAGES 168-178


Question= THE STAGING PLANS DO NOT ADDRESS THE HANDLING OF TRAFFIC ON KALIN ROAD FOR THE CONSTRUCTION OF THE BRIDGE COLUMN FOOTINGS. WILL A PLAN BE PROVIDED?

  • Please bid per current contract documents.

 

 31

  Q:08/04/2010
R:08/09/2010

Plan Sheet / Specification Reference= Grading


Question= I was wondering if you can release the AutoCAD linework for the grading portion of the job, so an accurate digital take off can be performed.

  • Please bid per current contract documents.

 

 32

  Q:08/09/2010
R:08/09/2010

Plan Sheet / Specification Reference= Plan sheets 168-178, specifically Sheet SC-2


Question= I can't find where the reconstruction work planned for Brandt Road anywhere in the staged construction drawings (SC-1 to SC-10). Is it to be included along with the stage 2 scope?

  • Yes.

 

 33

  Q:08/09/2010
R:08/09/2010

Plan Sheet / Specification Reference= SPECIAL PROVISION SECTION 5-1.17 UTILITIES: At the bottom of the page (#24) under an extensive list of utilities to be relocated there is a note that states: "Imperial Irrigation District (IID) work forces or subcontractors working under their supervision may only perform work at one location at a time unless otherwise approved by the Engineer."


Question= What purpose is served by empowering the Engineer to require that the IID work be prosectued at only one location at a time other than to delay the completion of the project?

  • IID reqirement.

 

 34

  Q:08/09/2010
R:08/10/2010

Plan Sheet / Specification Reference= Bid Item #32, Develop Construction Water


Question= Upon our review of the information provided in the materials handout associated with this item (IID Letter dated July 8, 2009), our interprutation is that Caltrans is providing the water source at no cost to the contractor and the contractor is responsible for supplying Caltrans with pump and appurtenances information so the EP can be perfected. Is this correct?

  • No, the letter intended only to say the water is available. Contractor will need to obtain a permit from IID and pay for the water in accordance with section 17 "WATERING" of the standard specifications.

 35

  Q:08/10/2010
R:08/11/2010

Plan Sheet / Specification Reference= Concrete Pavement


Question= Section 11-1, subsection 40-2.01D "Mix Proportions" spcifies that lab studies for mix design development in regards to water cementitious ratio must be 3.9 Mpa at 28 days and 4.5 Mpa at 45 days.

Section 11-1, subsection 40-1.03L "Engineer's Acceptance" specifies the minimum modulus of rupture for each lot is 3.9 MPa at 28 days.

Section 11-1, subsection 40-2.01E "Field Qualification" specifies that in order for the mix to be field qualified, the average strength of five beams must be at least 4.5 MPa at the age chosen by the Contractor, but not later than 28 days.

The specifications have always required 3.9 MPa or 565 psi for field qualification and material acceptance. The current English Unit version of the Standard Specification template for Section 40, from which Section 11-1 of this contract is derived, also requires 565 psi for field qualification. See the current version at http://www.dot.ca.gov/hq/esc/oe/specifications/SSPs/2006-SSPs/Updates/2010-07_updates/S1-020H_E_A07-30-10.doc

If 4.5 Mpa (650 psi) is required to field qualify, contractors will be forced to increase cement contents by as much as 1 sack/cy. This will drive up the cost of concrete accordingly. This cost is unnecessary since the acceptance criteria is only 3.9 Mpa. If Caltrans is looking for more durable pavement, this should be accomplished by adding thickness, not strength.

The Question is, will the engineer accept the concrete as being field qualified if the average strength at the age selected for testing, not later than 28 days, is at least 3.9 Mpa?

  • Please bid per current contract documents.


 36

  Q:08/11/2010
R:08/11/2010

Plan Sheet / Specification Reference= Concrete Pavement


Question= Is it necessary for us to obtain railroad insurance on this project?

  • Railroad insurance is only necessary when work is preformed within 50 feet of the Railrod Right of Way.

 37

  Q:08/11/2010
R:08/11/2010

Plan Sheet / Specification Reference= Concrete Pavement


Question= Do you have a good phone number and contact for IID? The numbers within the handout are disconnected. The handout also references an industrial water rate per their schedule #7. Can you provide us with this rate amount?

  • IID contact information is as follows
  • Randy Gray 760-339-9240
    Tony Montesinos 760-482-9900
  • David Escobar is Project Manager for the IID Water relocations
    760-339-9747 Phone
  • IID Water rate info can be found at:
    http://www.iid.com/Water/WaterRateSchedules


 


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