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TRANSPORTATION, WATER & INFRASTRUCTURE COMMITTEE

Meeting Date:	04/08/2019
Subject: APPROVE & AUTHORIZE to secure Proposition 1 grant funding with the California State Coastal Conservation.
Submitted For:	Brian M. Balbas, Public Works Director/Chief Engineer
Department:	Public Works
Referral No.:	2
Referral Name:	Review application for transportation, water and infrastructure grants to be prepared by Public Works & Conservation and Development Departments.
Presenter:	Carl J. Roner, Public Works Department	Contact:	Carl J. Roner (925)313-2213

Information

Referral History:

N/A

Referral Update:

The purpose of the proposed Coastal Conservancy Proposition 1 Grant* will be to fund the design phase of a green infrastructure project which will provide drainage to the Montarabay parking lot. The facility’s parking lot, which is 1.82 acres in size, is completely paved and does not have any drainage facilities. During much of the winter it is flooded by rainfall, restricting parking and access to the community center. The adjacent ballfields do not dry out until late summer. These flooding events limit public access to the facility during the winter months and interfere with food distribution events that are held in the Montarabay parking lot on a monthly basis.

The overall site is set between higher ground to the west and elevated railroad embankments to the north and south. The only way to provide for surface runoff drainage is to construct a pipeline to Garrity Creek, to the east. Due to the large surface area of the parking lot, the former industrial use of the site as a sewage treatment plant, and the sensitivity of adjacent Garrity Creek, which discharges to San Pablo Bay, any drainage improvements to the parking lot should incorporate bioswales and other green infrastructure techniques to treat surface drainage prior to discharge. Bioswales are landscape elements designed to concentrate or remove debris and pollution out of surface runoff water.

Placing bioswales in the parking lot to break up and slow down traffic (precluding illegal street racing) would be a benefit to the users of the community center, particularly the less mobile elderly. Bioswales would also make the site more attractive and parklike, adding an element of urban greening to the site requested by the grant application.

The grant will pay for the engineering and landscape design for the bioswales and drainage pipeline. Public Works will need to obtain additional funding from outside sources at a later date to permit and construct the bioswale and drainage pipeline.

* Coastal Conservancy Proposition 1 grants fund multi-benefit ecosystem and watershed protection and restoration projects.

Recommendation(s)/Next Step(s):

REVIEW the Proposition 1 grant application, and DIRECT staff as appropriate including sending the application to the full Board of Supervisors with a recommendation to approve and authorize the Public Works Director, or designee, to execute grant application documents to secure grant funding with the California State Coastal Conservancy, not to exceed $200,000, for the Montarabay Green Infrastructure and Drainage Project.

Fiscal Impact (if any):

None. The grant will pay for the engineering and landscape design for the bioswales and the drainage pipeline. Public Works will need to obtain additional funding from outside sources at a later date to permit and construct the bioswales and drainage pipeline.

Attachments
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