California Department of Transportation
 

Contract 10-0A8404

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) This will require that Caltrans provide cellular service for these modems early in the work of the contract, as well as provide the detailed configuration file for each modem. That cellular service and a setup file will be provided by Caltrans is not described in the special provisions. Furthermore, this demonstration of the modem is unusual for District 10, since on other contracts District 10 personnel have connected the modem to cellular service and configured the modem after sites have been accepted. Will Caltrans provide cellular service and setup files for each modem at the time a contract is made to allow testing to proceed promptly?

A1) Caltrans will provide cellular service and set up files for each modem. 2Nov11.


Q2) Special Provisions Section 10-3.16 describes a photovoltaic power supply. However, these specifications have significant engineering errors. For example, on page 158 the 65 watt solar panels described cannot output 17.4 VDC at 5.0 amps, since that is characteristic of an 87 watt solar panel. The 17.4 VDC and 5.0 amps output also exceeds the maximum stipulated solar panel capacity of 80 watts on page 158. But more significantly, none of the commercially available solar panels in the capacity range from 65 to 80 watts output 17.4 VDC at 5.0 amps under Standard Test Conditions. What solar panel capacity is required?

A2) Refer to Addendum No. 1, dated November 17, 2011. 22Nov11


Q3) Electrical drawing E14 shows the two solar panels mounted straddling the pole. This design is inherently flawed. It causes one solar panel to be shaded by the pole in the morning, and the other solar panel to be shaded by the pole in the afternoon. Shading a solar panel reduces the energy produced by each solar panel significantly. Both panels must be mounted on the South side of the pole and aimed due South while tilted up from horizontal at an angle that is at least the site latitude plus 15 degrees, and preferably the site latitude plus 21 degrees (21 degrees maximizes power output in Winter when solar systems are most challenged). Will a side of pole mounting frame be acceptable?

A3) Photovoltaic panels shall be mounted to Type VDS 40 standard as shown on the MVDS (Pole Mount and Wiring Details) plan (Sheet 153 of the plans). 22Nov11


Q4) The 40H by 25W by 11D NEMA 3R enclosure shown in drawing E14 is specified with a 3 watt max fan in a ventilation housing. This enclosure is much larger than required, since a 24x24x12 NEMA 3R will accommodate all the equipment shown in Detail C and will be half the cost. The primary source of heating for the enclosure is the sunlight on the walls and top of the enclosure. The 3 watt fan will achieve negligible cooling effect, and will consume as much power as the MVDS sensor. The temperature rise in an unventilated NEMA 3R enclosure is 30 degrees Fahrenheit above ambient when in the Summer sun. The equipment inside the NEMA 3R enclosure is rated for operation at much higher temperatures than those likely in unventilated outdoor enclosures in the San Joaquin Valley in Summer. The practice in District 10, as well as other Districts, is to turn vent fans off at solar powered sites since they represent an unwanted drain on the power resources of the solar power sy! stem. We recommend installing a 24x24x12 NEMA 3R with vents in the lower and upper side walls of the enclosure to enable natural convective cross ventilation through the enclosure. This will be sufficient to mitigate the potential for a Class I Division 2 environment inside the enclosure, and convection will be fostered by the heating induced by sunlight. Will Caltrans accept this?

A4) As stated in subsection "NEMA 3R ENCLOSURE" of Section 10-3.16 "PHOTOVOLTAIC POWER SUPPLY" of the Special Provisions, "Each NEMA 3R enclosure shall meet the requirements as shown on the plans and specified elsewhere in these special provisions." 22Nov11


Q5) Can you issue cross section with grid lines?

A5) Refer to Section 5-1.12 "SUPPLEMENTAL PROJECT INFORMATION" of the Special Provisions, as revised by Addendum No. 1, dated November 17, 2011. Revised cross sections are available at: http://www.dot.ca.gov/hq/esc/oe/project_ads_addenda/10/10-0A8404/ad1/10-0A8404XS.pdf. 21Nov11


Q6) Cross Section station 13+00.00 - In order to have the State understand our question please go to this section vs. the typical Section X-1 - X-1 indicates the contractor is to Cold Plane 0.10'(depth) and Overlay with HMA 0.15' over the roadway however, the cross sections show at least 0.73' of HMA to be placed in the same area. Can the State please provide a bid item for HMA - Leveling that looks to be required per the cross sections? We are also seeking additional days be added to the tight schedule for this operation? If, the State is going to indicate there will be no change, please clarify the Quan. for HMA - Leveling?

A6) Leveling is included in the total quantity for Hot Mix Asphalt. The amount of leveling will vary from section to section in this area because the Route 12 alignment is shifting between the Potato Slough Bridge and Glasscock Road. 8Nov11


Q7) Plan Sheet C-10 - Location Table - the following location 5-9 & 13-19. Please indicate what the State wants at these locations as the table is blank for these locations?

A7) Refer to the Electrical plan sheets for these locations. The Location Table on Construction Details C-10 (Sheet 35 of the plans) is provided for just the Electrical Systems locations that require a Maintenance Vehicle Pullout (MVP).2Nov11


Q8) Roadway Excavation Table sheet Q-1 - why is the State not including the total Roadway Exacation (cy) Quan. for embankment at the Tower Park and Access Road. Looks like there is 35,000(cy) of Roadway Exc. that can be used in lieu of import borrow. Is there something wrong with this material? Hazardous, pesticides or possible it is unsuitable.. Please clarify?? Question regarding "Roadway fill embankment as shown on the plans shall have a settlement period of not less than 90 days" Does this apply to the widening along Rte 12? This clause doesn't apply to "import borrow" ?correct?

A8) Imported Borrow is specified for backfill and embankment where shown on the plans for the new Access Road and Tower Park Way, in accordance with the Geotechnical Engineer's recommendation. The local soil contains peat which will decompose and is not suitable for placement under the structural section. The settlement period applies only to the new Access Road and Tower Park Way realignment areas. Refer to Typical Cross Sections X-4 and X-5 (sheets 5 & 6 of the plans). 3Nov11


Q9) There is no fiber optic modem specified for the MVDS sites. What equipment will this be?

A9) Refer to Addendum No. 1, dated November 17, 2011. 23Nov11


Q10) Page 152 of the Special Provisions in section 10-3.13 stipulates the modem shall be supplied with an EIA232 serial cable. This appears to conflict with the requirement to connect to a fiber optic modem. What does Caltrans intend?

A10) Refer to Addendum No. 1, dated November 17, 2011. 23Nov11


Q11) Can you please provide cross-sections that show grid lines with reference elevations, and with structural sections drawn in?

A11) Refer to Section 5-1.12 "SUPPLEMENTAL PROJECT INFORMATION" of the Special Provisions, as revised by Addendum No. 1, dated November 17, 2011. Revised cross sections are available at: http://www.dot.ca.gov/hq/esc/oe/project_ads_addenda/10/10-0A8404/ad1/10-0A8404XS.pdf. 21Nov11


Q12) Can new cross-sections with grid lines and structural sections please be issued soon to accurately quantify Roadway Excavation, Imported Borrow, and Embankment so there is enough time to provide true cost estimate?

A12) Refer to Section 5-1.12 "SUPPLEMENTAL PROJECT INFORMATION" of the Special Provisions, as revised by Addendum No. 1, dated November 17, 2011. Revised cross sections are available Available at: http://www.dot.ca.gov/hq/esc/oe/project_ads_addenda/10/10-0A8404/ad1/10-0A8404XS.pdf. 21Nov11


Q13) Your answer to question 8 is not reflective of the specifications as currently written. The specifications say that all embankment will settle for 90 days per the order of work. Your getechnical design report says that the embankment along Hwy 12 should settle for 30 days and the subexcavated fill and subsequent embankment on Tower and the Access Rd should settle for 90 days. Are we supposed to settle all embankment, or just the subexcavated areas per sheets x-4 and x-5?

A13) Refer to Addendum No. 3, dated November 30, 2011. 1Dec11


Q14)How long are we to settle the embankments? Please be specific as to alignment and stationing.

A14) Refer to Addendum No. 3, dated November 30, 2011. 1Dec11


Q15)The plans show IB material to be placed back in the subexcavated areas per sheet x-4 and x-5. Cal Trans specifies that this material be R5 or greater. If the excavation is = R5 in the subexcavation zone, then it can be used as import borrrow and the contractor will be paid for both excavation and import borrow with the same material? Or are you designating this subexcavation as unsuitable and must be exported from the jobsite. Please clarify the answers to these questions in an addendum.

A15) No, refer to Section 6-1.01 "SOURCE OF SUPPLY AND QUALITY OF MATERIALS" of the Standard Specifications: "The materials furnished and used shall be new, except as may be provided elsewhere in these specifications, on the plans or in the special provisions. The materials shall be manufactured, handled and used in a workmanlike manner to ensure completed work in accordance with the plans and specifications." Refer also to Section 19-7.02 "IMPORTED BORROW" of the Standard Specifications: "Imported borrow shall be of a quality suitable for the purpose intended, free of organic matter or other unsatisfactory material." 1Dec11


Q16) In a previous bidder's inquiry (A8), the state has informed contractors the the In-situ soil in the over-excavation areas of the Access Rd and Tower Park Way "contains peat which will decompose and is not suitable for placement under the structural section" and only references this to be in accordance with the Geotechnical Engineer's recommendation. However, the specifications do not state that this soil is unsuitable. In addition, the state responded in the same inquiry, "the settlement period applies only to the new Access Rd and Tower Park realignment areas". Page 36 of the specifications states "Roadway fill embankment as shown on the plans shall have a settlement period of not less than 90 days". Does the state plan on issuing an addendum to confirm the following?:
1) the soils, in the areas to be over-excavated (Access Rd and Tower Park Way), are unsuitable for roadway fill and embankment (would this also apply to the +/- 3,329 cy of material generated from ditch excavation along Access Rd and Tower Park Way?)
2) The settlement period will only apply to the new Access Rd and Tower Park Way realignment areas?

A16) Refer to Addendum No. 3, dated November 30, 2011. 1Dec11


Q17) Can the state provide boring logs/pothole data specific to the areas of over-excavation at the Access Rd and Tower Park Way? Is there any other information the state can provide to show the composition and permeability of soils in these areas?

A17) Refer to Addendum No. 3, dated November 30, 2011. 1Dec11


Q18) How does one obtain access/permission to perform potholing and sampling from soils in the Access Rd and Tower Park Way over-excavtion areas?

A18) Bidders who are interested in performing their own investigations will need to request right of way ingress from the District Encroachment Permit Office, contact (209)948-3656. 21Nov11


Q19)Will you please add Item #66, Truss Sign Structure, to the "Materials-on-Hand" payment list?

A19) No further addenda are anticipated prior to the bid opening. Therefore, if changes are necessary, they will be handled by proposed Contract Change Order. 6Dec11


Q20)Can you please provide cross-sections with grid lines, reference elevations, and with structural sections drawn in?

A20) Refer to Section 5-1.12 "SUPPLEMENTAL PROJECT INFORMATION" of the Special Provisions, as revised by Addendum No. 1, dated November 17, 2011. Revised cross sections are available Available at: http://www.dot.ca.gov/hq/esc/oe/project_ads_addenda/10/10-0A8404/ad1/10-0A8404XS.pdf. 21Nov11


Q21)Regarding the temporary irrigation diversion system, is there a plan drawing showing this system as the specifications indicate?

A21) No, refer to Section 10-1.11 "TEMPORARY CREEK DIVERSION SYSTEM" of the Special Provisions for a description of the materials and installation. 23Nov11


Q22)Can the bid date be postponed to provide contractors with time to fully consider answers to the significant number of questions that are in for consideration? Specifically, the cross-sections with grid lines, reference elevations, and structural sections have not been provided to accurately quantify dirt quantities.

A22) Bids will open on December 7, 2011, per Addendum No. 1, dated November 17, 2011. 23Nov11


Q23)When can contractors expect to see the requested cross-sections (with grid lines, reference elevations, and structural sections)? Information is needed to schedule take-off.

A23) Refer to Section 5-1.12 "SUPPLEMENTAL PROJECT INFORMATION" of the Special Provisions, as revised by Addendum No. 1, dated November 17, 2011. Revised cross sections are available Available at: http://www.dot.ca.gov/hq/esc/oe/project_ads_addenda/10/10-0A8404/ad1/10-0A8404XS.pdf. 21Nov11


Q24)Since the State has not quantified or identified the peat excavation in either the plans or specials provisions; our take is that this material is unsuitable for roadway embankment thus it will be paid for in such a manner per Standard Specification 19-2.02 Unsuitable Material which will make this material being paid for as extra work. If the State wishes to bid this project as is the Roadway Excavation item has been set-up as an under-run. Due to the Unsuitable material being paid for as extra work. The remaining quantity of Roadway Excavation would then go into adjustment based on Standard Specification 4-1.03B(2) Decrease of more than 25 percent paying the Contractor force account for the entire item due to the under-run. In closing, can the State please issue an addendum and remove this portion of peat quantity from the Roadway Excavation; thus creating an item for over-excavation (peat exc.) or add verbiage that would eliminate the Unsuitable Material specification. This will allow the Roadway Excavation item to be pure and help the State with any future claim. Please quantify and identify the peat excavation.

A24) Refer to Addendum No. 3, dated November 30, 2011. 1Dec11


Q25)Since the State has not specified any dewatering opertation; will the Contractor be required to dewater the over-excavated area at and near the Access Road. If this operation is required how will the contractor be paid. If required, can the State please add an item for "Temp. Active Treatment System"?

A25) Refer to the Geotechnical Design Report, dated May 9, 2008 in the Information Handout, which states that it's likely pumping will be required to dewater the excavation. Refer to Section 10-10-1.03 "CONSTRUCTION SITE MANAGEMENT," subsection "Dewatering," of the Special Provisions. Dewatering is included in the lump sum price for construction site management and a "Dewatering and Discharge Plan" must be included as part of the SWPPP plan. 1Dec11


Q26)If dewatering is required; can the State provide anticipated flow of water that we will encounter?

A26) No additional information will be provided. 1Dec11


Q27)Can the state provide geotechnical report/boring logs/pothole data for the project?

A27) Refer to Addendum No. 3, dated November 30, 2011. Additional supplemental project information has been provided for the Information Handout. 1Dec11


Q28)Is there any other information the state can provide that will show the elevation of ground water on this project?

A28) Refer to supplemental project information provided by Addendum No. 3, dated November 30, 2011. Bidders may also refer to the Department of Water Resources, Water Data Library:

http://www.water.ca.gov/waterdatalibrary/. 2Dec11


Q29)Please confirm the States LF for Remove Fence?

A29) No further addenda are anticipated prior to the bid opening. Therefore, if changes are necessary, they will be handled by proposed Contract Change Order. Dec11