Chimborazo Drop Shaft and Interceptor Sewer Replacement, PH1

Project Summary and Scope

PROJECT SUMMARY:

The Chimborazo Interceptor Sewer serves a portion of the Church Hill area to the north and west of the Chimborazo Park. The majority of the upstream sewer system flows to a manhole at the top of a steep slope adjacent to the park (MH C - 32nd St South of E Grace St.). The Rim Elevation of this manhole at the top of the slope is about 152 feet and the invert is about 124 feet, a depth of about 28 feet. The 48” circular brick sewer downstream is located in a significant slope. As a consequence of Hurricane Gaston, the slope adjacent to MHC failed and caused a portion of the downstream sewer to collapse. An emergency sewer repair was done in 2004. This involved reconstructing a portion of the “step” sewer in the slope near existing junction chamber (JC1). A HDPE sewer was constructed from JC1 to a new junction chamber (JC2) on the downstream 60” circular brick sewer. Because of the previous slope failure, the future stability of the existing sewer downstream of MHC is unknown.

SCOPE OF WORK:

Construct five new precast concrete manholes and a new 60” ductile iron gravity sewer to convey flow from a tie-in to an existing 60-inch brick sewer at the intersection of East Grace Street and North 32nd Street to the diversion chamber and from the drop shaft chamber to a tie-in with an existing 60-inch brick sewer at the bottom of the slope.  New sewers shall be installed using both open trench and micro tunneling methods.  The work also includes construction of launching pits for new 72-inch casing pipe installed by micro tunneling.

Construct a new 10-foot (internal dimension) inlet chamber manhole and new 18-foot (internal diameter) drop shaft chamber at the south end of Chimborazo Park in the Church Hill area of the city at the top of the existing slope in an existing city park road.

Project Milestones

RFQ - Advertised February 16, 2021. Proposals received March 23, 2021.

IFB - Bids received 11/16/2021 / Bids opened 11/17/21.

Contract Award - 1/31/2022

Notice to Proceed - 4/4/2022

Contract Start / Duration - 4/4/2022 / 660 consecutive calendar days

Contract Completion Date: 1/23/2024

Project Funding

FY18 Virginia Clean Water Revolving Loan Program - #C-515624

Total Loan amount: $8,944,513

Project Status Updates

12/31/2023

Phase 1 - E&S Control / Site Security - 100% Complete

Phase 2 - Temp Bypass Sewer / Ready Bypass Pumping - 100% Complete

Phase 3 - Launch Pits / Micro Tunneling / Inlet Chamber / Drop Shaft Excavation – 100% Complete

Phase 4 - Drop Shaft / Inlet Drop Shaft Construction - 95% Complete – Structures are complete. Inverts are poured.  Grating is installed and top is onsite ready to be set and the top will be placed around the removable panels.

Phase 5 - Temp Bypass / Connect Sewer - 9.1% complete – Bypass is set to go live on Tuesday 12/19.  The existing sewer at MH 4 has been exposed.  Work down below is set to begin as soon as the bypass is set in place.

Phase 6 - Abandoning Old MH & Sewer - 16.2% complete – Lower portion of abandonment has been done.  Flowable fill will be done and manholes demolished after tie in is complete.

Phase 7 - Stabilization / Restoration - 0% complete

9/26/2023

Phase 1 - E&S Control / Site Security - 100% complete

Phase 2 - Temp Bypass Sewer / Ready Bypass Pumping - 100% complete

Phase 3 - Launch Pits / Micro Tunneling / Inlet Chamber / Drop Shaft Excavation - 94.7% complete

Phase 4 - Drop Shaft / Inlet Drop Shaft Construction - 15% complete

Phase 5 - Temp Bypass / Connect Sewer - 9.1% complete

Phase 6 - Abandoning Old MH & Sewer - 16.2% complete

Phase 7 - Stabilization / Restoration - 0% complete

12/30/2022

Drop Shaft has reached 80ft and the manholes at the bottom of the hill have been installed in preparation of the micro tunneling operations to begin in February 2023.

Project signs have been posted and all safety measures remain in place.

10/17/2022

Safety fencing was installed around the upper and lower construction zones. Excavation work began at the lower elevation with the installation of manholes in preparation of re-routing sewage flow. Excavation has begun on the drop shaft. This work will be done in 4'ft lifts until the full depth of the drop shaft is reached.

3/22/2022

Pre-Construction Meeting held

Notice to Proceed: April 4, 2022

Contract Duration: 660 Calendar Days

Contract Completion Date: January 23, 2024

1/31/2022

Contract Awarded to Southwood Building Systems, Inc.

12/01/2021

Reference Check conducted and Recommendation to award Memo submitted

11/23/2021

Bids received from three (3) vendors

Apparent Low Bidder - SOUTHWOOD BUILDING SYSTEMS, INC.

9/1/2021
Design modifications and cost estimate is complete. Revised documents submitted to Procurement for advertisement.

7/1/2021

RFQ Process complete and list of recommended contractors has been submitted to Department of Procurement.  Design modification and update of cost estimate is in process. 

3/30/2021

Project advertised for Request for Qualifications on February 16, 2021.  Proposals received on March 23, 2021.  Proposals under review to select qualified contractors to bid on construction of project.

1/13/2021

Project to be re-advertised for Request For Qualifications. Previous RFQ process expired.

12/30/18

Project design is at 100% and has been submitted to the Department of Procurement Services to advertise the Request for Qualifications.

Contractors will be qualified, and the design will be completed prior to advertisement for bids to construct.

11/30/18

RFQ review completed and the list of recommended contractors to be invited to bid on the project submitted to Department of Procurement.   The 100% drawings, plans and specifications to be submitted for IFB advertisement.

10/18/18

Project design is at 90% and has been submitted to the Department of Procurement Services to advertise the Request for Qualifications.

Contractors will be qualified, and the design will be completed prior to advertisement for bids to construct.

Permit, information is listed below. For details, please call the Department of Planning, Development and Review at 804-646-4169.

Categorical Exclusion - TBD

Certificate To Construct - Approval Letter received: 7/20/18

Work In Street Permit - Will be obtained by the contractor prior to the start of construction.

Expenses (costs are reported quarterly)

Expenditures as of: 7/31/23

Preliminary Engineering Report: $183,104.15

Engineering Design: $ 493,151.93 

Engineering Services During Construction: $ 367,168.65

CM Services: $ 491,423.03

Construction: $ 9,360,170.00

Project Contact Information, if you have questions about this project, please contact this individual.

For information about the details of any project first contact the public information office for the department running the project.  For most projects the following people can help:

• Department of Public Utilities Rhonda Johnson RHONDA.JOHNSON@RVA.GOV (804) 646-5463

Performance Measures and Benchmarks

N/A

Project Overall Status (Active, Pending or Complete)

Active

Ordinance Information

TBD

Contract Information

N/A