lessons learned usda rural development funded alternative wastewater systems
TRANSCRIPT
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Lessons LearnedUSDA Rural Development Funded
Alternative Wastewater Systems
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Alternative WW Systems
• RD Funded Alternative WW Systems– Definition– History– Recent Problems– Lessons Learned/Looking Ahead
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Definition of “Alternative” Wastewater System
• This is Jon’s definition
• Different than traditional RD funded treatment systems, which largely consisted of ponds, regionalization & mechanical plants
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Types of Alternative WW Systems
• In general, RD has financed three types of alternative systems:– Constructed Wetland/Re-circulating Gravel
Filter– Sand Filter – Soil Based Disposal
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Why Alternative Systems?
• Several hundred unsewered areas in MN
• Available grant dollars on downward trend
• Traditional treatment systems often have high capital costs
• If alternative costs less (construction and O&M), than we can help more communities
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Timeline• 1998 – Present
– Promote Alternative Systems • 1998
– First RD alternative system funded• 2003
– Failures/extent of problem started to become apparent• 2004
– More problems, consulted outside experts• 2005
– State funding of repairs ($5M for 6 towns), on the road to recovery– July conference of experts, funders, regulators
• 2006– State may fund more repair/replacement
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Status of RD Funded Alternative WW Systems
• 21 Systems constructed since 1998• 4 Systems in operation less than one year• Of the 17 systems in operation more than
one year:– 30% have failed outright– 40% are operating below expectations or
experience intermittent problems
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Definitions
• Failure– Systems simply don’t work
• Mounds - water draining out side
• Sand filters - flooding and/or freezing
• Cannot handle flows
• Permit limits not met on a regular basis
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Definitions cont.• Intermittent Problems
– Freezing during coldest winter periods– Significant amount of additional operator time– Occasional failure to meet permit limits– Wetlands - flooding, plant survival rate
• Bottom line – system may not last, or work as intended, for length of loan/design life
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Some Comparisons…
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Discharge Method• Surface
– 9 Systems• 4 Failures/Problems• 5 OK
• Sub-Surface– 12 Systems
• 9 Failures/Problems• 3 OK
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Permit Agency vs. System Status
• 8 County Permitted Systems– TOTAL: 6/8 Failure/Problems = 75%
• 12 MPCA Permitted Systems– TOTAL: 6/12 Failure/Prob = 50%
• 1 Tribal Permit– 1 Problem = 100% ?
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Date of Operation
Have we gotten better?
OR
Are the new systems yet to report failure?
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O&M Cost vs. System Status
• Higher O&M costs = reduced rate of failure ?– No
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Cost per Unit
• No apparent relationship between cost and success rate
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Repair/Replace
• A failure is not necessarily a total loss – Collection system may be OK/salvaged– An intermittent problem could be tweaked to work
• Repair/replace may cost more than original project• 2005 - State of MN has kicked in $5M for failing
systems• 2006 – State has proposal of $6.5M for problems
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Typical Situation
• Small Town <100 residents
• Never had a complying system (might have a central sewer but no treatment)
• Low income/Elderly residents
• Little or no growth in the last 20 years
• Small lot sizes
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Why Failure/Problems?– Design
• Independent third party reviews show majority of responsibility lies here for outright failures
– Construction• added to problems in some cases
– Operation & Maintenance• Much of the problem for intermittent problem
systems
– Other?
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Typical Reasons for Failure/Problem Systems
• Design– Hydraulically Undersized
• Design flow
• I&I
– Incorrect Media – RSF’s– Soil Classification/Loading Rates
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Typical Reasons for Failure, contd.• Construction
– Incorrect materials– Installation & Methods– Lack of inspection/proper inspection
• O&M– No O&M manual– Failure to pump tanks – solids pushed through– Cleaning UV system
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July 2005 RD Alternative WW Conference
• Four day conference held 7/05• Attendees
– Funders– Regulators– Technical Experts
• Two days in meetings• Two days in field visiting problem systems
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Recommendations from Summer 2005 Conference
• Improve Technical Review Process – RD, State, Outside Experts
• Establish Education Committee
• Establish Engineering/Design Standards Committee
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What is RD doing?• Independent studies/review • In general, no additional RD funds until
determination is made as to cause of failure• Require borrowers to seek remedies from
responsible parties• Working with others to identify design/O&M
problems• Improve review process• Held conference - summer 2005
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Is The Problem Only With RD Funded Projects or State-wide?
• Not Sure– We’re working with the State to compare data
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What Now?• Stop The Bleeding
– Repair/replace current problem systems– Prevent future failures
• Everyone has been affected– Bad name for technologies– Engineers– Lack of trust– Funders– Regulators– Taxpayers
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What Next?
• RD’s Position – Alternative Technologies Work – RD Will Still Fund and we want to have
Preliminary Engineering Reports consider them
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Food For Thought
• Water Systems– RD also funds Water Systems– Wide variety of treatment– Some pilot projects, etc.– Nowhere near the amount of problems
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Lessons Learned
• Technical Review– Establish Review Committee– Better job of estimating true costs for construction and
O&M
• Develop Design Guidelines • Capacity Development
– Establish Education Committee– Improve ability of borrowers to manage projects
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MOSTCA & On-Site Systemsin RD Funded Projects
• There is definitely a growing need for on-site and cluster systems– Reasons:
• 1. May be more cost effective for small users
• 2. May be easier to operate and maintain
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MOSTCA & On-Site Systemsin RD Funded Projects contd.
• Hurdles– 1. Acceptance by communities that this is really state of
the art for them– 2. Central Ownership and maintenance required by RD– 3. How to get everybody into the system (esp. those
that have working OSTS)– 4. No man's land
• Too big for designers, not on engineer's radar• Designer may have to find engineer to work with when over
10,000 GPD – possible State rule changes
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QUESTIONS?