Susana Alcala Wood, City Attorney Jorge Oseg uera, City Auditor Mindy Cuppy, City Clerk Howard Chan, City Manager John Colville, City Treasurer City Council Report
915 I Street, 1st Floor
Sacramento, CA 95814
www.cityofsacramento.org
File ID: 2022-00672 April 12, 2022 Consent Item 05
Tit
le: Agreement: Combined Sewer System Long Term Control Plan Update Loca
tion: Citywide
Re
commendation: Pass a Motion authorizing the City Manager or the City Manager’s designee to execute a Professional Services Agreement with Woodard & Curran to update the Combined Sewer System (CSS) Long Term Control Plan for an amount not-to-exceed $416,700.
Co
ntact: Chad Ringlstetter, Project Manager, (916) 808-1412, [email protected]; Nina Buelna, Supervising Engineer, (916) 808-4937, [email protected]; Tony Bertrand, Engineering & Water Resources Division Manager, (916) 808-1461, [email protected], Department of Utilities Pr
esenter: None
Atta
chments:
1-Description/Analysis
2-Agreement
File ID: 2022-00672 Consent Item 05
April 12, 2022
powered by Legistar™
City of Sacramento
Description/Analysis
Issue Detail: Staff recommends City Council approve an agreement with Woodard & Curran, to update the Combined Sewer System (CSS) model with recent Capital Improvement Project (CIP) and precipitation data, conduct a 30-year buildout analysis, consider the impacts of CSS outflows to the public, identify adaptive management strategy to address any increase of Combined Sewer Overflows (CSO), review the Long Term Control Plan’s (LTCP) goals and timeline, and consider the effect of climate change.
Policy Considerations: City Council approval is required for professional service agreements of $250,000 or more per City Code 3.64.020.
Economic Impacts: None.
Environmental Considerations:
California Environmental Quality Act (CEQA): This report concerns administrative activities that will not have a significant effect on the environment and does not constitute a “project” as defined by the California Environmental Quality Act (CEQA).
CEQA Guidelines Section 15378(b). The activity is a continuing administrative and maintenance activity [CEQA Guidelines section 15378 (b)] and is not subject to CEQA (CEQA Guidelines Section 15060(c)(3).
Sustainability: The proposed project is consistent with the 2035 General Plan (U 3.1) as it improves infrastructure reliability, by proposing rehabilitation projects to decrease flooding, CSS outflows and CSS overflows.
Commission/Committee Action: Not applicable.
Rationale for Recommendation: On November 3, 2021, a Request for Proposal (RFP) was advertised and issued on PlanetBids for engineering services. On the due date of December 2, 2021, three proposals were received from the following firms:
1. Woodard & Curran
2. West Yost
3. Stantec
File ID: 2022-00672 Consent Item 05
April 12, 2022
powered by Legistar™
City of Sacramento
A 5-member evaluation team that included four staff from DOU and one member from Sacramento Regional Sanitation District (Regional San), evaluated and ranked the proposals of the three firms. Staff reviewed the proposals and based on their team’s overall knowledge, expertise, and experience; Woodard & Curran was selected to provide the requested services.
Financial Considerations: The proposed agreement is for an amount not-to-exceed $416,700. Sufficient funding exists in the Combined Master Plan Program (I14610300) to award the agreement.
There are no General Funds allocated or planned for this project.
Local Business Enterprise (LBE): Contractor is an LBE.
Background: Since the 1980’s, the City has been implementing a combined sewer system improvement plan (CSSIP) and LTCP to prioritize improvement projects for the City’s CSS by utilizing a hydrologic and hydraulic (H&H) model and meeting National Pollution Discharge Elimination System (NPDES) Permit requirements. The stated interim goals of the LTCP are to obtain protection from a 5-year and 10-year storm event.
During the late 1990’s and into the first decade of the 2000’s, the CSSIP was developed and identified improvements to critical facilities to minimize the impacts of CSS overflows to the river. These improvements were implemented and greatly reduced the volume of untreated discharges to the river. A CSS water quality assessment was conducted in 2013 and concluded that the infrequent and short duration of CSS overflow discharges and pollutant loadings do not impact applicable receiving water beneficial uses; therefore, strategies targeting reducing CSS outflows to City streets and other surfaces (confirmed with City H&H modeling) became the focus of improvements to the CSS.
Flooding occurs when stormwater cannot enter the system during peak wet weather flow conditions exceeding pipe capacity and/or during outflow conditions. The completion of the CSS H&H model expansion and enhancement occurred in 2015, and a list of prioritized projects were developed based on updated model results. System-wide programs were identified to reduce the sanitary flows and stormwater runoff entering the collection system, thus providing a system-wide benefit to flood reduction goals. The system-wide programs require additional information on specific technologies and performance before moving forward with application. Therefore, the sequencing of programs is structured differently than the projects to allow for pilot programs and early performance feedback to factor into the progression of the system-wide programs.
In 2018, an LTCP Update was completed that incorporated H&H model enhancements, CSSIP, and the findings of the CSS impacts on water quality per the CSO Control Policy and the 1995 LTCP Guidance Manual.
File ID: 2022-00672 Consent Item 05
April 12, 2022
powered by Legistar™
City of Sacramento
The 2018 LTCP Update established a schedule and needed budget to complete the phase 1 (or top 20%) of storage and conveyance projects, pilot testing of the programs, and the establishment of an adaptive management strategy. The objective of the adaptive management strategy is to meet flood protection goals by continuously refining the accuracy and confidence of the tools and information needed to further analyze, develop, and refine projects. The reissuance of the City’s NPDES Permit was adopted in October 2020 and the following items were required:
• Estimate, at minimum, 30-year buildout flows for the CSS based on new development and redevelopment projects expected throughout the CSS service area. If flows are expected to increase that could result in an increase in CSO’s and/or CSS outflows, an adaptive management strategy shall be developed to identify projects to mitigate increased flows to ensure CSO’s and CSS outflows do not increase as a result of the growth.
• Conduct a review on the LTCP’s goal and timeline of achieving protection from CSS outflows during the 10-yr (6-hr) storm event. The review should consider potential impacts of CSS outflows to the public. The evaluation should consider these items and provide any recommended updates to the goals of the LTCP and timeline. In developing this update, the Discharger must consult with Department of Public Health staff and/or Sacramento County Public Health, as applicable.
• Recalculate the 5-year, 10-year, and 100-year design storm return frequencies based on current climatic information and considering the effects of climate change, as appropriate. The updated design storms shall be incorporated into the LTCP. To meet the LTCP update requirements set forth in the City of Sacramento Department of Utilities National Pollutant Discharge Elimination System Permit, Order NO. R5-2020- 0039 for the Combined Sewer System. The permit requires an updated Water Quality Assessment (WQA), and revisions to the LTCP. LTCP revisions will be accomplished by modeling and analyzing the most current precipitation data for design storm return frequencies, conducting a review of the LTCP’s goals and timeline, performing a 30- year buildout analysis, evaluating the impacts of CSS outflows to the public and considering the effects of climate change.