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April 28, 2015 City Council Workshop
PEP Tank Replacement Evaluation
City Council Goal 1 Expansion
Objective: To enhance infrastructure in order to maintain quality neighborhoods and business district
Strategy: Projects targeted as highest priority for replacement shall be evaluated for potential upgrade or enhancement
Measurement: Provide City Council with a presentation of the existing PEP tank replacement program
City PEP System
PEP system designed by ITT in the early 1970’s as an alternative to the installation of a conventional gravity sewer system in certain areas of the City
12,825 active PEP tanks and the count is growing every week
PEP Tank Failures2000 - 2014
2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 20140
20
40
60
80
100
120
Why do PEP Systems Fail?
PEP Tank Failures vs. Rainfall2000 - 2014
2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014
Replacement
1 5 1 0 23 17 13 93 78 53 33 74 70 101 84
Rainfall
37.6 60.7 56.9 61.4 62.2 59.1 30.3 61.7 42.5 67.3 37.5 39.6 52.9 52.9 69.7
10
50
90
New PEP Tank Installations2000 - 2014
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
0
500
1,000
1,500
2,000
2,500
475688
878
1,697
2,0792,293
1,128
22178 72 47 47 29 65 109
2003-2006 = 7,197
Multiple Sub-Contractor Installations 2004-2006
Pre-2004 2004 2005 2006 Post-20060
1,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
0
20
40
60
80
100
120
140
160
180
200
83
41 3319 6
PEP Tank Replacement AnalysisHigh Growth + Sub-Contractor Installation 2004-2006
Original Tanks Replaced Tanks
Tota
l Num
ber
Inst
alle
d
Tota
l Num
ber
Repla
ced f
rom
FY2013-M
arc
h 2
015
0.50%
0.79% 0.58%
0.67%
0.36%
Annualized Failure Rate 182 Tanks Replaced from FY2013 – Q2 FY2015
Potential Causes of PEP Tank Failures
Record Setting Growth in Palm Coast from 2003 through 2006
Underground Utility Sub-Contractor PEP Tank Installations
Work Site Conditions and Environment
Insufficient Staff for Workload and Inspections of PEP Tank Installations
Solution and Future Plan of Action Upgrade to Continuous H20 Load Rated PEP Tanks
Continue to Perform Installations and Replacements with City Staff, if Possible
Monitor Growth and Replacements to Ensure Adequate Staffing Level for both Installation and Inspections
Ensure Appropriate Budget to Maintain Program
Water and Wastewater Utility Capital Improvement Plan
PEP Tank Installations
*Based on 2014 Wastewater Management System Facilities Plan for Growth Inside City Limits with 20% Requiring PEP Tank Installation
**Based on Replacement Trends over Last 8 Years
Year NewTanks*
Replacement Tanks** Current CIP Forecasted
2015 113 75 $600,000 $629,000
2016 117 75 $850,000 $641,000
2017 122 80 $900,000 $665,000
2018 168 80 $950,000 $815,000
2019 254 80 $1,050,000 $1,095,000
Total2015-2019 774 390 $4,350,000 $3,845,000
Questions
