Port-Wide Sewer System Management Plan(SSMP) - Port of Oakland

Chapter 9
SYSTEM EVALUATION AND CAPACITY ASSURANCE PLAN
This chapter provides an evaluation of the Port of Oakland (Port) sanitary sewer system
facilities, identifies and proposes improvements for deficiencies, identifies design criteria,
and provides a list of capital improvement projects (CIP) and schedule for improvements.
9.1 REGULATORY REQUIREMENTS
9.1.1 San Francisco Bay Area RWQCB Requirements
The San Francisco Bay Area Regional Water Quality Control Board (RWQCB) requires the
following:
a. Each wastewater collection system agency shall establish a process to assess
the current and future capacity requirements for the collection system facilities.
b. Each wastewater collection system agency shall prepare and implement a CIP
to provide hydraulic capacity of key sewer system elements under peak flow
conditions.
The RWQCB allows for this element to be waived for collection systems that serve a
population of 10,000 or less. However, the State Water Resources Control Board (SWRCB)
requirements do not allow for such a waiver. Therefore, the Port must prepare a Port
specific System Evaluation and Capacity Assurance Plan (SECAP).
9.1.2 SWRCB Requirements
State General Waste Discharge Requirements Order No. 2006-0003 (GWDRs), issued by
the SWRCB, requires that the Port prepare and implement a CIP that will provide hydraulic
capacity for peak dry weather flows as well as the appropriate design storm or wet weather
event. The Sewer System Management Plan (SSMP) must address, at a minimum, the
following:
a. Evaluation. Actions needed to evaluate those portions of the sanitary sewer
system that are experiencing or contributing to a sanitary sewer overflow (SSO)
discharge caused by hydraulic deficiency. The evaluation must provide
estimates of peak flows (including flows from SSOs that escape from the
system) associated with conditions similar to those causing overflow events,
estimates of the capacity of key system components, hydraulic deficiencies
(including components of the system with limiting capacity) and the major
sources that contribute to the peak flows associated with overflow events;
b. Design Criteria. Where design criteria do not exist or are deficient, undertake
the evaluation identified in (a) above to establish appropriate design criteria;
c. Capacity Enhancement Measures. The steps needed to establish a shortand
long-term CIP to address identified hydraulic deficiencies, including
prioritization, alternatives analysis, and schedules. The CIP may include
increases in pipe size, infiltration and inflow (I/I) reduction programs, increases
May 2010 9-1
pw://Carollo/Documents/Client/CA/Port of Oakland/8239A00/Deliverables/Ch09 (FinalA)