Item 2A vAGENDA ITEM # 2A
OCTOBER 9, 2006
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PREPARED BY:
APPLIED TECHNOLOGY AND MANAGEMENT, INC.
JACKSONVILLE BEACH, FLORIDA
AuGUSr29, 2006
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AGENDA ITEM # 2A
OCTOBER 9, 2006
City of Atlantic eeacn
2006 Sewer Master Plan and Capital Improvement Plan Update
~• EXECUTIVE SUMMARY
The City of Atlantic Beach authorized Applied Technology & Management, Inc (ATM), to
prepare the 2006 Sewer Master Plan Update and 10-Year Capital Improvement Plan (2006
SMP Update). The update includes condition assessments and capital improvement
recommendations for the:
• Gravity sewer collection system (laterals, manholes, and gravity pipes)
• Lift Station pumping systems (lift stations and forcemains)
• Wastewater treatment plants (WWTPs)
In addition to the general capital improvements associated with typical future operations of the
sewer system, the City is also anticipating more stringent nutrient discharge limits on their two
WWTPs associated with future Total Maximum Daily Load (TMDL) legislation. In conjunction
with the 2006 SMP Update, we are evaluating several options for meeting the anticipated TMDL
legislation.
The City's sewer collection system is maintained well, from a day to day operations standpoint.
Lift stations are clean and well cared for, which is indicative of the rest of the system. The main
issue facing the City's sewer system is age. A significant portion of the sewer collection
infrastructure; whether gravity pipes, lift stations, or forcemains is at or beyond its typical life
expectancy. This issue is especially evident in the gravity sewer piping, where older vitrified
clay pipes are cracked and have deteriorated. These damaged pipes are allowing significant
amounts of rainwater and groundwater, known as inflow and infiltration (I/I), to enter the City's
sewer system. The resulting increase inflow not only impacts the capacity of downstream pipes
and lift stations, but also affects the flowrates at the WWTPs. With potential costly upgrades to
the WWTPs to address TMDL legislation, the additioral flolN from I/I has a significant impact on
plant operation and associated costs. To address These issues in a manner that is economically
feasible for the City, we have developed a systematic approach where a portion of the City's
infrastructure is rehabilitated every year. This approach divides the City's infrastructure into
sections, such that the sections in the worst condition are addressed first, and the projects are
divided over the CIP's ten year time frame. The costs for these improvements are detailed in
the respective sections of this report and are summarized in the CIP table at the end, of this
section.
This Master Plan also includes analysis of the City's two wastewater treatment plants (WWTPs),
•. which were not considered in the 2000 master plan. This report identifies capital improvements
necessary to meet both the TMDL (discussed in the following paragraph) and general
improvements necessary for continued high quality and safe operation of the facilities. Note
'~ that the general improvements are a combination of site visits to .the WWTPs by the ATM
- Project Team and working closely with City staff.
Final Report
APPLIED TECHNOLOGY & MANAGEMENT, INC.
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AGENDA ITEM # 2A
OCTOBER 9, 2006
~ Clty of Aua~ n~~ ~Gacn
2006 Sewer Master Plan and Capital Improvement Plan Update
The anticipated TMDL legislation will significantly reduce the City's allowable mass loading of
nitrogen to the St. Johns River; the exact reduction amount is still being debated. Reduction of
nitrogen can be achieved by either improving treatment at the WWTPs or implementing a reuse
~. program. The City may be receiving grant money to fund a reuse project, which would remove
approximately 0.275 million gallons per day (mgd) of the City's 3.5 mgd of effluent discharge.
To address nitrogen reduction in the remaining effluent, we evaluated several options:
• Optimizing the existing plant designs while upgrading both plants for nitrogen
removal
• Upgrading the Atlantic Beach WWTP for nutrient removal and pumping the
Buccaneer WWTP's flow to it for treatment
• Constructing a nutrient removal system to treat effluent from all of the Beaches
Communities, and locating it at the Buccaneer WWTP.
• Upgrading the Atlantic Beach WWTP and performing minor process improvements at
Buccaneer. This option only meets the anticipated initial TMDL limit, but does not
~. meet the future limit.
As described in this report, there are multiple variables outside of this analysis that should be
°" considered when the City decides which TMDL option to pursue. For that reason, this Report
~ does not make a distinct recommendation regarding the best option. Instead, we present the
~ --~ ~ .advantages, disadvantages, and costs for each. The City should use this information, in
conjunction with information relating to stormwater TMDLs, the future use of Buccaneer WWTP,
future plans for implementation of reuse, etc... to ultimately decide how to proceed. For the
~* purposes of preparing the City's 10-year Sewer Capital Improvement Plan, we have used
Option 4, the Hybrid Option (meets the interim limit) as it appears to be the Option that the City
_ is most interested in based on our meetings at 90%.
The table presented on the following page outlines the City's 10-year CIP. Note that certain
,~„ items in the table are presented in line item form, such as "Collection System Improvements."
For a more detailed breakdown of what those improvements involve, we have referenced the
section of this report where the information is presented in a more detailed form. Also note that
"~' the improvements are broken down by the timeframes 2007, 2008-2010, and 2011-2016. We
have chosen to use timeframes rather than specific years, so that the City may adjust this plan
as new information becomes available, City staff identify new issues, and to mesh it with
budgetary constraints. Additionally, each line item includes a ranking (High, Mid, Low), such
that the City can readily discern which improvements are the most important with respect to
"" each timeframe. We recommend that the City revisit this plan annually and reprioritize .the
improvements based on the changing criteria noted earlier in this paragraph.
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II APPLIED TECHNOLOGY ~ MANAGEMENT, INC.
Final Report
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AGENDA ITEM # 2A
OCTOBER 9, 2006
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