Chimborazo Drop Shaft and Interceptor Sewer Replacement

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 a new flow diversion chamber and new drop shaft chamber at the south end of Chimborazo Park in the Church Hill area of the City.  The new chambers shall be located at the top of the existing slope in an existing City park road.  The drop shaft chamber shall contain two prefabricated vortex type drop units; one for dry weather flow and one for wet weather flow.

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 microtunneling methods.  The work also includes construction of launching pits for new 72-inch casing pipe installed by microtunneling.

Project Milestones

RFQ - Completed 6/3/19

IFB - Pending

Contract Award - TBD

Notice to Proceed - TBD

Contract Start / Duration - TBD

Project Funding

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

Total Loan amount: $8,944,513

Project Status Updates

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 contracotrs 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: 12/18/19

Preliminary Engineering Report: $183,104.15

Engineering Design: $ 466,694.70

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:

Performance Measures and Benchmarks

N/A

Project Overall Status (Active, Pending or Complete)

Active

Ordinance Information

TBD

Contract Information

N/A

Click here to leave Feedback