TO: Board of Supervisors
FROM: Steven Lederer - Director of Public Works
REPORT BY: Dewey Phan, Assistant Engineer
SUBJECT: Award of Storm Repair Construction Contracts for Projects at Dry Creek Road MPM 6.2, 9.48, 9.75, and Diamond Mountain Road MPM 1.1
RECOMMENDATION
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Director of Public Works requests the following actions regarding 2021 Four Lagging Walls Construction Projects:
1. Award of a contract to Piazza Construction of Penngrove, California for their low base bid of $2,282,930 and Additional Alternative No. 1 at Dry Creek Rd MPM 6.2, RDS 21-30 of $150,716 to construct an additional lagging wall #3, for a total of $2,433,646 and authorize the Chair to sign the construction contract for the following:
a. Dry Creek Road MPM 6.2, RDS 21-30
b. Dry Creek Road MPM 9.48, RDS 21-39
c. Dry Creek Road MPM 9.75, RDS 21-06
d. Diamond Mountain Road MPM 1.1, RDS 21-04
2. Approval of Budget Transfers increasing appropriations by $2,921,983 in Measure T non-operating special revenue fund (Fund 2440, Org 1220053) and increase appropriation by $370,921 in SB1 non-operating special revenue fund (Fund 2440, Org 1220052) offset by the use of its available fund balance to fund the following four Roads Capital Improvement Projects: (4/5 Vote Required)
a. Increase appropriation by $1,188,210 in Dry Creek Road-MPM 6.2, RDS 21-30, project budget in the Roads CIP budget (Program 22010) offset by increase in revenue from the transfer from Measure T funds;
b. Increase appropriation by $370,921 in Dry Creek Road-MPM 9.48, RDS 21-39, project budget in the Roads CIP budget (Program S9106) offset by increase in revenue from the transfer from the SB1 Budget;
c. Increase appropriation by $968,016 in Dry Creek Road-MPM 9.75, RDS 21-06, project budget in the Roads CIP budget (Program S7312) offset by increase in revenue from the transfer from Measure T funds; and
d. Increase appropriation by $765,757 in Diamond Mountain Road-MPM 1.1, RDS 21-04, project budget in the Roads CIP budget (Program S7127) offset by increase in revenue from the transfer from Measure T funds.
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EXECUTIVE SUMMARY
A series of storms caused significant damage at several locations, including the following project sites:
1. Dry Creek Road mile post marker (MPM) 9.75 - Sustained about 70 feet of embankment failure;
2. Diamond Mountain Road MPM 1.1 - Sustained about 50 feet of roadway and embankment failure.
3. Dry Creek Rd. MPM 9.48- Sustained about 15 feet of roadway and embankment failure.
4. Dry Creek Road MPM 6.2-Sustained about 70 feet of embankment failure causing two slides and roadway distress.
For each site, the proposed repair is to reconstruct the road and bank with a steel soldier pile and concrete lagging retaining wall. The four sites were advertised as one construction contract for economies of scale. Work is expected to commence in the spring of 2022 and be completed prior to the winter of 2022/23.
The engineer's estimate including the Additional Alternative No. 1 was $2,015,000. It is recommended that the Board award the contract to Piazza Construction for their low bid of $2,282,930 and Additional Alternative No. 1 of $150,716 for a total cost of $2,433,646, approve the budget transfer, and authorize the Chair to sign the construction contract.
FISCAL & STRATEGIC PLAN IMPACT
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Is there a Fiscal Impact? |
Yes |
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Is it currently budgeted? |
No |
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Where is it budgeted? |
Fund 2040, Org 2040500. The full cost of each project is estimated as follows: 22010 - Dry Creek Road MPM 6.2 = $1,384,295, S9106 - Dry Creek Road MPM 9.48 = $487,656, S7312 - Dry Creek Road MPM 9.75 = $1,144,673, S7127 - and Diamond Mountain MPM 1.1 = $924,830 for a Total = $3,941,454. The funding for 22010 (RDS 21-30), S7312 (RDS 21-06) and S7127 (RDS 21-04), is from Measure T fund and the funding for S9106 (RDS 21-39) is from SB1 fund |
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Is it Mandatory or Discretionary? |
Discretionary |
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Discretionary Justification: |
The proposed project will stabilize the roadways and reconstruct the roadway pavement sections. The requested approvals will allow for construction of the repair. |
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Is the general fund affected? |
No |
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Future fiscal impact: |
Design began in Fiscal Year 2021-22 and construction will begin in Fiscal Year 2021-22. Construction will likely continue into Fiscal Year 2022-23. For the repairs next to Dry Creek bank, it is possible that 5 to 10 years of monitoring and additional budget will be required beyond FY 2022-23 |
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Consequences if not approved: |
Future rain events could cause additional landslides |
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County Strategic Plan pillar addressed: |
Livable Economy for All |
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Additional Information |
The Board appropriated the following funding for the design phase in the respective Projects: 22010 - Dry Creek Road MPM 6.2 = $196,085, S9106 - Dry Creek Road MPM 9.48 = $116,735, S7312 - Dry Creek Road MPM 9.75 =$171,657, and S7127 - Diamond Mountain Road MPM 1.1 = $159,073, for a Total = $643,550. |
ENVIRONMENTAL IMPACT
ENVIRONMENTAL DETERMINATION: Consideration and possible adoption of a Categorical Exemption Class 1: It has been determined that this type of project does not have a significant effect on the environment and is exempt from the California Environmental Quality Act. [See Class 1 (“Existing Facilities”) which may be found in the guidelines for the implementation of the California Environmental Quality Act at 14 CCR §15301; see also Napa County’s Local Procedures for Implementing the California Environmental Quality Act, Appendix B.]
BACKGROUND AND DISCUSSION
Winter storms that occurred between 2017 and 2021 caused damage to Dry Creek Road near mile post markers (MPM) 6.2, 9.48, and 9.75 and Diamond Mountain Road near MPM 1.1. Dry Creek Road MPM 9.48 and MPM 9.75 sustained 15 feet and 70 feet of embankment failure, respectively. At Dry Creek Road MPM 6.2, heavy rains over saturated a 70 foot long +/- portion of the road causing two slides and roadway distress. Diamond Mountain Road MPM 1.1 sustained 30 feet of embankment failure. If these sites are not stabilized and repaired prior to the next significant rain event, it is possible that major and more disruptive failure will occur.
The project proposes to stabilize the roads with steel soldier pile and concrete lagging walls and re-construct the roadways with full-depth asphalt repairs with minimal intrusion into Dry Creek. At Dry Creek MPM 6.2, the consultant designed two separate retaining walls totaling 150 linear feet, however, due to the potential susceptibility to a future slide between the walls, County staff recommends constructing a 60 linear foot long wall between the two separate walls to make a continuous 210 linear feet long wall. This portion was bid as an additive alternate.
The four projects were advertised on March 11, 2022 as one bid package for economies of scale and the Clerk of the Board opened six bids on April 7, 2022.
Piazza Construction Penngrove, CA $2,282,930.00
Granite Rock Company San Jose, CA $2,424,246.00
Maggiora & Ghilotti San Rafael, CA $2,456,700.00
Ghilotti Construction Santa Rosa, CA $2,456,789.10
Gordon N. Ball, Inc. Alamo, CA $2,911,095.00
Suulutaaq, Inc. Suisun City, CA $2,989,819.60
The engineer's estimate was $2,015,000. The successful low bidder is Piazza Construction for their base bid of $2,282,930 and Additional Alternate No.1 of $150,716. Construction is anticipated to commence in May 2022 and to be completed by October/November of 2022, weather permitting. A 10% contingency is requested for any unforeseen items of work.
The total project budget with the addition of engineering design, construction management, project management, special inspection and contingency is $3,941,454 and will be funded with Measure T and SB1 funds (see attached project budget). In addition to a previous appropriations of $643,550, a budget transfer of $3,292,904 is needed to move this project forward.
Piazza Construction is not a local vendor however, the Public Contract Code requires that the construction contract be awarded to the lowest responsible and responsive bidder regardless of whether the low bidder is local or not. Staff reached out to the local construction contractor community by advertising the request for bids in the Napa Valley Register and the Solano-Napa Builder's Exchange, and by posting on the County website. Staff also sent "Notices to Contractors" to the local construction community. Once the construction contract is awarded, County staff will contact the Napa County Workforce Investment Board (WIB) and require the successful contractor to contact the WIB and let the WIB know of its hiring needs.