Repasky, Mark D.

English

Aquatic Commons

5/25/20051
Decentralized Overview
Mark D. Repasky, PE
Wastewater Specialist
5/25/20052
Because in Florida,“It’s the
water, stupid.”
When the water’s brown, ain’t no one
coming down.
5/25/20053
Plenty of studies have been
done
 We know what works
 And under what conditions
 Several things lacking:
 Good Engineering design
 Good Quality Control during installation
 Professional management for ongoing O&M
5/25/20054
Current status quo
 DOH regulates
Has incomplete management mandate, and
inadequate funding for same
Maintenance entities too fragmented,
also have inadequate rate structure
5/25/20055
Institute EPA Level V
Management structure for
all new construction not
connected to central sewer
Must be done“in quantity”for
wholesale as opposed to retail costs
 EPA Model Code exists
5/25/20056
Utility, Level V
 Supplies
 Installs
Maintains
Billing is same as any utility:
On-site Treatment Systems
Cluster systems (parts of neighborhoods)
Package plants
5/25/20057
Specify treatment levels
based upon site sensitivity
 Location
Springshed
Waterfront
Near water
 Isolated from water
 Soil conditions
5/25/20058
For existing systems
 Level IV or Level V
Retrofit based upon site sensitivity, as
required
5/25/20059
What problems does
onsite/decentralized solve?
 NIMBY: WWTP
 Land expense, direct as well as indirect cost
and time lost during acquisition
 Controls-without stifling-development and
density
 Virtually every property in our area already
has an onsite system; they simply need to be
upgraded, properly maintained, and
managed
5/25/200510
 COST FOR COLLECTION SYSTEMS: ZERO
 $$ can be used for treatment, management
 Reuse for landscape irrigation: demand
reduction
 Rapidity with which we can attack problem
systems/triage
 Concurrency: install as needed
 Rewards those that do (and especially have
already) done the right thing by installing an
appropriate onsite treatment system
 Stormwater work can be done on each site at
the same time
5/25/200511
Additional capacity via soil treatment
No point-source discharge of partially
treated wastewater to surface waters
Maintenance of ambience thru
promulgation of native/desirable
species, irrigated with reuse water
 This is accomplished onsite, without
delay, without severe disruption of
city life and concomitant indirect
costs
5/25/200512
Other notes
Drip: if dose properly, soil never
saturated, then water must go up via
capillary action, evapotranspiration—
no impact upon ground water
 Irrational rules and requirements can
SEVERELY impact cost efficiency
5/25/200513
Wakulla Springs Park &
Lodge Septic system
Any treatment added?
Was simply large tanks, dosed
drainfield, near spring
 Transient systems like these
sometimes concentrate on ammonia,
converting to nitrate, and dumping
into drainfield/soil/groundwater


Decentralized Overview

http://aquaticcommons.org/936/1/repasky2.pdf

Decentralized Overview

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