California Department of Transportation
 

Contract 10-0K0204

The responses to bidder's inquiries, unless incorporated into a formal addendem 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 availability or use of information provided in the responses to bidder's 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.

Q1) Are cross sections available?

A1) Copies of cross sections can be purchased from Stockton Blue Reprographics, Phone (209) 464-8724. The same cross sections may be viewed at the District's Construction Office in Stockton by making an appointment with the Duty Senior at (209) 948-7849.


Q2) What type of Joint Seal assembly is required for this project? Is the required movement rating 100 mm or greater than 100 mm? The Special Provisions require a Joint Seal Assembly with a "maximum movement rating of 100 mm". The contract drawings require a Joint Seal Assembly with a movement rating of "greater than 100 mm". The contract drawings also state that the actual movement rating of the joint seal assembly is 100 mm.

A2) Please refer to Addendum 2, dated August 28, 2009.


Q3) PLAN SHEET R-40 SHOWS TYPICAL RETAINING WALL DETAILS, FOR COBBLESTONE TEXTURE AND STAINED CONCRETE. HOW IS THE COBBLESTONE TEXTURE ON THE RETAINING WALLS PAID?

A3) Refer to "Measurement and Payment" in Special Provisions Section 10-1.58 "ARCHITECTURAL SURFACE (COBBLESTONE TEXTURED CONCRETE), per Addendum No. 2, dated August 28, 2009.


Q4) Is there a railroad right of way agreement and how can I get a copy?

A4) A copy of the executed agreement is not available. Refer to Special Provisions Section 13 "Railroad Relations and Insurance Requirements," Exhibit I, "Caltrans Right of Entry Agreement."


Q5) There is no falsework opening for the Railroad Crossing. Will a falsework opeining be required?

A5) Contractor attention is directed to Section 13 "RAILROAD RELATIONS AND INSURANCE REQUIREMENTS", of the Special Provision.


Q6) How many trains use the track and what is the frequency?

A6) The Contractor is responsible for contacting the owner, the Union Pacific Railroad Company, for this information. Refer to Section 13, "Railroad Relations and Insurance Requirements," Exhibit G, Part 1, subsection 1.03, "UPPR Contacts."


Q7) REFERRING TO SHEET 205 AND 206 OF 293, THERE IS 6899 M2 OF ARCHITECTECTURAL TREATMENT REQUIRED ON RETAINING WALLS 1 THRU 5.

REFERRING TO BID ITEM 79 (F), ARCHITECTURAL SURFACE (COBBLESTONE TEXTURE CONCRETE), THERE IS A PAYMENT QUANTITY OF 40 M2.

REFERRING TO SECTION 10-1.58 ( ARCHITECTURAL SURFACE ( TEXTURED CONCRETE), IN THE SPECIAL PROVISONS, THE MEASUREMENT AND PAYMENT ON PAGE 149 REFERS TO COLUMNS, WINGWALLS, AND CONCRETE BARRIER, BUT NOTHING ON RETAINING WALLS.

WHERE DOES THE RETAINING WALL TEXTURE GET PAID FOR?

A7) Refer to the revised Bid Item List, per Addendum No. 2, dated August 28, 2009, for Item No. 79 "ARCHITECTURAL SURFACE (COBBLESTONE TEXTURED CONCRETE)"


Q8) REFERRING TO SPECIAL PROVISION (PAGE 107), BRIDGE REMOVAL, 2ND PARAGRAPH, IT STATES “Bridge Removal shall consist of removing existing bridge in their entirety including all pile caps as shown on the plans”.

Does this include the existing footings that don't conflict with the new bridge construction?

A8) Refer to General Plan No. 2 for West Merced Overhead (Replace), Sheet 256 of the plans, for limits of concrete removal.


Q9)On sheet TH-13 reference is made to a temporary traffic screen on the temporary k-rail (see the middle of the page). There is no item for tempoary traffic screen. Is temporary traffic screen required? If so, where? If so, how is it paid for?

A9) Temporary traffic screen will not be required.


Q10) Our takeoffs for this item indicate a quantity overrun of more than 12%. Has the thickened slab at the joint seal been included in the State's computation?

A10) Refer to the revised Bid Item List, per Addendum No. 2 dated August 28, 2009, for Item No. 76 STRUCTURAL CONCRETE, APPROACH SLAB (TYPE N)."


Q11)We have noticed a number of conflicts between the structural sections (and their widths) shown on the typical x-sections and the stage construction x-sections. Compare the typical x-section on sheet 8 (sta 28+80 to 29+40) to the stage construction x-section shown on sheet 93 (sta 29+20 to 30+40). Structural Section "B" is shown in one but not the other. Additionally, the typical x-sections end at sta 29+40 as well as the layout drawings (sheet 14) yet the stage construction shows work al the way to sta 30+80. This is only one example. Also refer to the stage construction x-section on sheet 94 from sta 18+80 to sta 19+53.56. Once again, no structural section "B" is shown as indicated on the typical x-section shown on sheet 3. Please clarify the limits and structural sections.

A11) The Detour Typical Cross Sections on plan sheets 92 through 95 show structural sections that will be required to detour NB and SB traffic into the median. They will be removed as necessary to construct the final roadway structural section where they are in conflict and/or outside those stations shown in the Typical Cross Sections on plan sheets 2 through 8.


Q12) The typical section for RW #6 and RW #7, on plan sheets 193 and 198, indicate the limits of the Geosynthetic Reinforcement, and callout for the placement of Class 2 Aggregate Base between each layer of Geosynthetic Reinforcement. Question, is it the design engneer's intent to have the entire embankment between RW #6 and RW #7 composed of Class 2 Aggregate Base, or shall the placement of Class 2 Aggregate Base be limited to the width of the Geosynthetic Reinforcement, and the remainder of embankment be imported borrow?

A12) Placement of the Class 2 aggregate base is limited to the width of the geosynthetic reinforcement, indicated as BW (base width) on the retaining wall plan sheets. Refer to subsection "Construction" of Special Provisions Section 10-1.36, "Geosynthetic Reinforced Embankment."


Q13) Are additional as-built drawings available for the existing bridge at the West Merced Overhead Replacement?

A13) Bridge as-built drawings are available. Refer to Section 2-1.03B, "Supplemental Project Information," of the Amendments to the Standard Specifications: "If bridge as-built drawings are available: 1. For a project in District 1 through 6 or 10, you may request them from the Office of Structure Maintenance and Investigations, fax (916) 227-8357."


Q14) ON PLAN SHEET 205 OF 293 TITLED - RETAINING WALL DETAILS (ARCHITECTURAL SURFACING PATTERN DETAILS)IN THE PROFILE VIEW SECTION AA THERE ARE TWO HORIZONTAL SMOOTH CONCRETE BORDERS THAT RUN PARRELEL TO EACH OTHER AT THE TOP AND BOTTOM OF THE RETAINING WALL FACE. ARE THERE ANY SMOOTH CONCRETE BORDERS THAT WILL RUN VERTICAL WITH THIS RETAINING WALL DESIGN?

A14) Yes, but they are only required at the two ends of each retaining wall, as shown on the Front View detail, on Retaining Wall Details (Architectural Surfacing Pattern Details) R-40.


Q15) DO THE FORMLINER JOINTS HAVE TO ALIGN WITH THE EXPANSION JOINTS SHOWN ON THE RETAINING WALL PLANS?

A15) No, the form liner joints and the retaining wall expansion joints have different spacing requirements. Refer to subsection "Form Liners" of Special Provisions Section 10-1.58 "ARCHITECTURAL SURFACE (COBBLESTONE TEXTURED CONCRETE), revised by Addendum No. 2, dated August 28, 2009: "Form liners shall extend the full length of texturing with transverse joints at 2.5 m minimum spacing." Refer to Standard Plan B0-3, "Bridge Details," for expansion joints and weakened plane joints, as noted in the elevation views on the Retaining Wall Plans.


Q16) CAN THE FORMLINER BE PLACED ON THE SURFACE OF THE RETAINING WALL WITHOUT TAKING INTO CONSIDERATION THE ALIGNMENT OF THE FORMLINER JOINTS AND THE EXPANSION JOINTS?

A16) Refer to the requirements of subsection "Form Liners" of Special Provisions Section 10-1.58 "ARCHITECTURAL SURFACE (COBBLESTONE TEXTURED CONCRETE), revised by Addendum No. 2, dated August 28, 2009.


Q17) The detail of the typical retaining wall (section AA) on sheet 205 shows the retaining wall to be 75 mm thickier than the standard type 1 retaining wall from the top of the wall to the bottom of the 610 mm smooth concrete barrier which is at finish grade. Item 75 is a final pay item. Has this volume of concrete been included in the estimated quantity shown in the bid item list?

A17) Refer to the revised Bid Item List, per Addendum No. 2 dated August 28, 2009, for Item No. 75 STRUCTURAL CONCRETE, RETAINING WALL."


Q18) Please clarify how the class 2 aggregate base embankment between the geosynthetic reinforcement is to be paid. On page 110 Embankment Backfill, it is stated that the structural backfill shall conform to Class 2 aggregate base of Section 26. In page 11 a specification is provided for "Rock" which is the rock for filling the gabions. Under Measurement and Payment on page 113 the contract price per square meter is supposed to include ".....rock, backfill material...". Is the "backfill material" the class 2 aggregate base and is it to be paid for under item 75?

A18) Refer to "Measurement and Payment" of Special Provisions Section 10-1.36 "Geosynthetic Reinforced Embankment." Backfill material (Class 2 aggregate base, in this case) is included in the contract price paid per square meter for geosynthetic reinforcement embankment (Bid Item No. 50).


Q19) If the Class 2 aggregate base is to be paid under item 75, has the volume of Class 2 Aggregate Base been deducted from the quantity of embankment shown on sheet 163? Obviuosly this would impact the import borrow item.

A19) Refer to the response for Question 18. The volume of the backfill material is not included in the embankment quantity.


Q20) Please clarify the horizontal limits of the Class 2 aggregate base for the Geosynthetic Reinforced Embankment. Based on the typical sections shown on sheet 193 & 198, it appears that the class 2 aggregate base ends where the geosynthetic reinforcement ends as indicated by the "bw" dimension. Does that mean that the material between the ends of the geosynthetic reinforcement on both RW #6 and RW #7 can be imported borrow?

A20) Yes, refer to the response for Question 12. The material between Retaining Walls #6 and #7 (i.e. outside the "BW") is imported material.


Q21) Please review the import borrow quantities. The volume of embankment shown at the bottoms of sheets 15 thru 18 is 132,011.63 m3. There is no embankment shown on sheets 19 thru 21 even though the profiles would indicate that there is embankment at these locations. The total of embankment shown on the roadway quantities summary on sheet 163 is 109,321 m3. Can you clarify the differences?

A21) The Roadway Quantities on Summary of Quantities Q-1 (Sheet 163 of the plans) show the correct quantities. Plan sheets 15 through 19 have been revised, per Addendum No. 2 dated August 28, 2009.


Q22) Since the quantity of embankment for Stage 1 as shown on sheet 163 is so small are we to asume that the entire volume of material between the faces of RW #6 and RW #7 is supposed to be Class 2 aggregate base and that there is no import borrow between the "GRER1" LOL and "GREL1" LOL? This should be clarified since the typical sections on sheets 193 & 198 don't show the Class 2 aggregate base extending beyond the limits of the geosynthetic reinforcment as measured by the "bw" dimension.

A22) No, refer to the responses for Questions 19 & 20.


Q23) There does not appear to have pay quantities included for the minor concrete (minor structures) for the temporary inlets, will the quantities be adjusted for these?

A23) Refer to the Temporary Drainage Quantities on Stage Construction SC-20 (sheet 87 of the plans). The quantity for minor concrete (minor structure) is included on Drainage Quantities DQ-4 (sheet 62 of the plans).


Q24) Items #5 & 6, For the temporay alternate culverts, can we abandon them place?

A24) Refer to Special Provisions Section 10-1.08 "Temporary Alternative Pipe Culverts," which states "When no longer required for the work as determined by the Engineer, temporary alternative pipe culverts shall be removed."


Q25) Item #25, Does the temporary railing (K-Rail) during Stage 2 & 3 need to be pinned down?

A25) Yes, refer to Standard Plan T-3, Temporary Railing (Type K), for details.


Q26) Regarding Special Provision section 10-1.02 Material Containing Lead. Is a copy of the lead investigation report available for review?

A26) Refer to Special Provisions Section 5-1.11, "Supplemental Project Information," revised per Addendum No. 2, dated August 20, 2009. Site investigation reports are available for inspection, by appointment, at 611 San Juan Avenue, Stockton, CA 95203; telephone (209) 948-7849.


Q27) Plan sheet 193 typical geosynthetic reinforced embankment detail is not consistent with the gabion half cage detail as shown on plan sheet 204. The half gabion cage detail on sheet 204 shows a 152mm x 50mm welded wire with fabric intermediate wall about 0.6m back from the face of the gabion wall. The typical section on plan sheet 193 shows the geosynthetic reinforcement wrapping around the gabion rock and back 1.2m over the top and does not show the intermediate wall. Can Caltrans clarify which detail is correct?

A27) Sht 193 does not specifically show the 152 x 50 welded wire mat. However, the dimensioning on sht 193 shows that this mat is to be 250mm high and placed 600mm back from the wall LOL. With this backing in place, the rock is placed, the geosynthetic reinforcement is wrapped around the rock, then the Cl 2 AB is placed above the wrapping and outside the 600mm width up to the 'BW' in width and 500mm high for each layer.


Q28)Is this project going to be postponed due to the outstanding bid inquiry question that ahve not been answered?

A28)Bids for this work will be opened on Wednesday, September 23, 2009, instead of the original date of Wednesday, September 2, 2009. Please reference Addendum No. 2, dated August 28, 2009.


Q29)REFERRING TO PLAN SHEET 289/293, SECTION B-B, IT APPEARS THE 50 MM X 75 MM TEXTURE REVEAL ON THE COLUMN IS BACKWARDS. PLEASE CLARIFY.

A29) No additional information will be provided. Bid per the current contract documents.


Q30)Is the job going to be postponed due to the questions that need to be answered?

A30) Bids for this work will be opened on Wednesday, September 23, 2009, instead of the original date of Wednesday, September 2, 2009. Please reference Addendum No. 2, dated August 28, 2009.


Q31)The table titled "Utility Rearrangement for Pile Driving, Drilling Activities, or Subsurface Construction" on page 18 of the Special Provisions shows the list of utilities that will be rearranged or temporarily deactivated to facilitate construction. There is an overhead electrical and telephone line, that runs parallel to the Bent 3 line, shown on the foundation plan on sheet 259 of 293 that was not included in the table and will be in direct conflict with several items of work, including but not limited to bridge demolition, structure excavation, pile driving and falsework erection. Will these utilities be relocated as well?

A31) Refer to Section 10-1.185, "Right of Way Obstructions," added by Addendum No. 2, dated August 28, 2009: "It is anticipated that these improvements will be vacated and removed by February 1, 2010."


Q32)Please verify mesh size required is 152 X 152- W9.1 X W9.1.

A32) No additional information will be provided. Bid per the current contract documents.Refer to Sheet 287 of the plans, "Slope Paving-Full Slope" for West Merced Overhead (Replace), revised by Addendum No. 4, dated September 16, 2009.


Q33)The call-out for the top deck reinforcing gives the option of using either B0-5/5-10 or 5-11. Normally there is a plan view of the deck within the plans specifing where each detail applies, I can't find one in this set, can the option 5-10 be used for the entire deck?

A33) Yes, either Detail 5-10 or 5-11 of Standard Plan BO-5, "Bridge Details," may be used for the entire deck.Refer to Sheet 275 of the plans, "Girder Layout Span 3 & 4" for West Merced Overhead (Replace), revised by Addendum No. 4, dated September 16, 2009.


Q34)The specified rock will create a considerable amount of void space. The fabric that is shown on the detail on sheet 204 appears to address the facing of the gabion half basket only. It seems that the long term affect of fines migration should be concern. Should the fabric detail encapsulate the Rock? or a smaller rock size?

A34) The detail is correct as shown.


Q35)There is no detail that we could find for the preformed stiffeners.

A35) Refer to the manufacturer's recommendations. Refer also to the requirements of Section 5-1.02, "Plans and Working Drawings" of the Standard Specifications.


Q36)Is a Hazardous Materials Survey Report available that has tested for Asbestos Containing Materials (ACM) for the existing West Merced OH (Bridge No. 39-0131L/R)? If so, can this be provided as a pdf. document on the Bidders Inquiry website? If ACM are found on the existing bridge structure, how will the removal of the ACM and submittal of the Asbestos Compliance Plan be paid for and under which Bid Item?

A36) Please refer to Addendum No.4, dated September 16, 2009.


Q37)How will Caltrans' scheduled furlough days effect bid document, post-bid document, and project execution?

A37) Department of Transportation employees are now directed to take three furlough days per month. The days to be taken off are the first three Fridays each month. Our administration offices will be completely closed during furlough days. This closure was directed by the Governor's Executive Order S-13-09. Please plan around these closures by ordering plan sets early and planning to do business with our offices from Monday through Thursday. These closures will affect services such as bid opening results (on-line and hotline), bid verifications, and contract award processing. Our field personnel will continue to operate as shown on the construction workday calendar and as needed for public safety.


Q38)On Sheet No. 190 of 293 / R-25 / "RW5" Typical Section. Can we in lieu of using 1' wide of pea gravel material as pervious backfill behind the retaining walls. Could we be allowed to use a pervious filter fabric material placed against the inside of the retaining wall that is designed to catch water and channel it down to seep through the designed weep holes? This pervious filter fabric would allow us to backfill the retaining wall with import borrow up to the fabric in lieu of the 1' wide pea gravel shown on the plans. Noticing that it would be impossible to control the width of the pea gravel during installation because the dirt past the 1' width would be placed as backfill at the same time as the pea gravel, resulting in an uncontrolled waste of pervious pea gravel backfill.

A38) Pervious backfill material shall be placed as shown. Refer to Section 19-3.065, "Pervious Backfill Material," of the Standard Specifications


Q39)On Sheet No. 205 of 293 / R-40 Typical Retaining Wall / Section AA. Can the concrete haunch be doweled into the retaining wall and poured after the retaining wall is poured? Or will it have to be poured monolithic with the retaining wall?

A39) Standard Specifications Section 51-1.11 "Construction Methods" states that "the concrete in each integral part of the structure shall be placed continuously." Refer also to Standard Plans B3-8, "Retaining Wall Details No. 1," and B11-55, "Concrete Barrier Type 732."


Q40)On Page 32 of the Special Provisions / Section 8-1.03 State-Furnished Materials / Item B. Specter Radar Unit. Is the Specter Radar Unit that the State is furnishing the same thing as the Portable Radar Trailer Item in Bid Item No. 24 with a quantity of 4 each?

A40) Item B, "Specter Radar Unit," of Special Provisions Section 8-1.03 "State-Furnished Materials" has been deleted by Addendum No. 4, dated September 16, 2009.


Q41)REFERRING TO SHEET 250/293, WE REQUEST THE MONTHLY HISTORICAL FLOW DATA FOR BEAR CREEK, AT THE HWY 99 STRUCTURE 39-0132 (R/L).

A41) No additional information will be provided.


Q42)Addendum #2 changed Bid Item #75 quantity from 6609 M3 to 6714 M3 but did not change the Plan Sheet R-41 retaining wall quantity summary of 6609 M3. Where is the added 105 M3 for this bid item?

A42) Refer to Sheet 206 of the plans, "Retaining Wall Quantities R-41," as revised by Addendum No. 4, dated September 16, 2009


Q43)Addendum #2 Bid Item List Sheet #9 needs to be corrected. It provides two mobilization items (#132 and #134).

A43) Refer to Addendum No. 4, dated September 16, 2009, for revised "Bid Item List."


Q44)During takeoff we continue to come up with 464 ea on Item 71 the contract calls for only 420 ,are we suppose to base the bid on 420?

A44) No additional information will be provided. Refer to Section 2-1.12B, "Bid Item List and Bid Comparison," of the amended Standard Specifications: "Submit a bid based on the work item quantities the Department shows in the Bid Item List."


Q45)During Takeoff we continue to come up with 7900 M for item 70 the contract only calls for 7537 m ,are we to base are bid on 7537 m?

A45) No additional information will be provided. Please refer to Section 2-1.12B, "Bid Item List and Bid Comparison," of the amended Standard Specifications.


Q46)Bid Item #50 - Please define how this item is being calculated for payment. Is CT paying for the m2 for the face of wall or is it for the m2 for each layer of embankment placed? Wouldn't it be better to pay this item as M3 instead?

A46) Geosynthetic reinforced embankment will be measured and paid for by the square meter determined by the product of the height (shown as H on the Typical Sections on Retaining Wall Plans R-8 & R-33, sheets 193 & 198 of the plans) and the longitudinal length of the wall(s).


Q47)Could you please show the limits of the reinforced embankment on the cross sections?

A47) The limits of the reinforced embankment is the base width (BW), as shown in the Typical Sections on Retaining Wall Plans R-28 & R-33.