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Description
San Bruno City Council Meeting September 10, 2013
10d. Authorize Installation of Flow Meters at 7th Ave. and Tanforan Ave. Project
A
Now,
item
10b
adopt
a
resolution
authorizing
the
city
manager
to
execute
a
sole-source
contract
with
hora
Tech
controls,
environmental
instrumentation
to
furnish
and
install
three
flowed.
Our
flow
meters
for
the
dry
weather
flow
monitor
at
seventh
Avenue
and
Tantra
Avenue
project
in
the
amount
of
56
thousand
two
hundred
and
twenty-six
dollars
and
a
construction
contingency
of
eight
thousand
four
hundred
and
thirty
four
dollars.
B
The
city's
wastewater
is
treated
jointly
through
the
jointly
owned
south
san
francisco
san
bruno
water
quality
control
plant.
The
city's
wastewater
is
conveyed
through
sewer
mains
on
seventh
Avenue
and
tan
friend
Avenue,
before
flowing
into
South
San
Francisco
for
treatment.
The
city
has
to
flow
meters
at
these
locations
to
measure
the
flow
that
come
from
our
city.
B
The
flow
meters
are
important
because
the
the
treatment
costs
that
are
shared
with
South
San
Francisco
are
based
upon
proportions
of
flow
volume.
Treated
and
also
knowledge
of
the
sewer
flow
characteristics
is
important
for
the
city
to
properly
manage
our
sewer
system.
It
helps
us
to
understand
the
sewer
system,
condition,
determine
inflows
and
infiltrations
in
wet
and
dry
weather
conditions
and
the
effectiveness
of
best
management
practices
in
operating
and
maintaining
our
system.
B
Irregularities
in
flow
measurement.
Data
from
the
existing
flow
meters
over
the
past
few
years
have
been
identified.
The
city
hired
witli
bruschetta
associates,
who
are
experts
in
the
field
of
flow
sewer
flow
monitoring
to
design
the
best
solution
to
monitoring
our
sewer
flows
for
accuracy
and
long-term
reliability.
B
Woodley
Burchett
has
evaluated
the
various
options
to
provide
accurate
and
reliable
flow
metering
in
consideration
of
our
specific
site
conditions.
The
flowed
our
meter
is,
you
recommended
alternative.
This
flow
meter
will
provide
equal
or
superior
accuracy
to
all
other
option
is
considered
and
can
operate
in
the
most
difficult
conditions,
including
flows
with
high
solids
content,
high
temperature,
shallow
and
caustic
flows
and
high
velocities.
B
The
recommendation
consists
of
replacement
of
the
two
existing
meters
on
tan
fur
and
Avenue,
and
seventh
Avenue
and
installation
of
a
third
meter
to
measure
flows
from
a
12-inch
sewer
line
on
tanforan
Avenue,
which
is
currently
unmetered.
The
proposed
flow
meters
do
not
require
contact
with
the
sewer
flow
and
can
be
recalibrated
if
subsidence
or
ground
movement
occurs
in
the
future.
Some
other
advantages
of
this
type
of
meter
include
ease
of
installation
without
additional
excavation,
and
they
will
not
interfere
with
sewer
main
cleaning
operations
and
they
are
relatively
low
in
cost
at
50.
B
B
The
installation
includes
the
flow
meters,
the
data
collection
systems,
the
telecommunication
systems
and
training
to
our
staff
staff
recommends
that
council
adopt
the
resolution
authorizing
the
city
manager
to
execute
a
contract
with
or
tech
controls,
environmental
instrumentation
to
furnish
and
install
three
fluid
or
meters
in
the
amount
of
56
56
thousand
dollars.
226
the
construction
contingency
of
eight
thousand
four
hundred
thirty
four
dollars.
Also
here
is
the
diagram
of
how
the
flow
meter
works.
B
C
Inaccurate
reading,
what
if
there's
a
salt
built
up
here,
you
know
I
mean
do
we?
Do
we
actually
know
what
the
actual
flow
of
you
know,
flow,
material
and
I
mean,
and
it's
and
it's
interesting
to
know.
You've
got
a
fifty
thousand
plus
piece
of
equipment
there,
but
we've
got
I,
don't
want
to
even
say
what's
flowing
through
there,
but
you're
talking
about
radars
and
ultrasonics
and
sensors
and
things
what
is
do
we
have
do
we
have
a
any
indication
of
how
effective
and
how
durable
these
these
mechanisms
are
in
the
other
cities.
B
There's
actually
a
long
list
of
references
Justin
even
in
the
bay
area
or
the
different
agencies,
have
all
given
positive
feedback
or
using
these
these
flow
meters
for
billing
purposes
and
for
just
measuring
flows
for
a
sewage
treatment
plant
as
well.
Well,
it's
just
monitoring
their
flow
volumes
and
their
sewer
systems.
B
B
Generally
and
generally
speaking,
we
do
have
to
keep
our
our
sewer
mains
clean
and
that's
as
part
of
our
main
regular
maintenance,
the
fortunate
thing
about
these
types
of
flow
meters.
There
is
no
in
flow
sensor
and
the
sensors
also
not
only
they
utilize
depth,
but
they
also
calculate
you
know
velocity.
So
there
are
times
when
solids
could
back
up
its
put
possible
where
the
flow
actually
stops,
but
you
have
a
you,
have
a
depth.
This
would
know
that.
There's
a
zero
flow
on
that.
A
B
Of
the
equipment,
the
maintenance
and
operation
of
this
type
of
system
is
no
different
than
the
other
types
of
systems.
In
fact,
it's
it's
probably
less
the
other
systems.
You
cannot
recalibrate
it.
If,
if
the,
if
they're,
subsidence
or
ground
movement,
then
it
will
not
operate
properly
this
type
of
system,
you
can
actually
recalibrate
it,
because
it's
also
measuring
velocity
as
well
as
depth
and
there's
these
complicated
computer
algorithms
that
you
can
recalibrate
to
account
for
the
different
flow
conditions
and
the.
A
D
Rico,
seventh
avenue
a
couple
questions:
what
influence
does
the
effectiveness
of
the
ultrasonic
depth
help
if
there
sediment
that's
not
moving?
In
other
words,
you
you
can
say
you
have
so
much
depth
in
there,
but
are
you
assuming
that
the
whole
depth
is
is
moving
and
when
you're,
when
you're
measuring
the
flow
by
the
by
the
radar?
That's
looking
at
the
top
part
of
the
flow,
or
can
it
tell
you
that
all
of
its
moving
or
nobody
could
you
have
surface
movement
and
have
sediment
build-up
and
not
accurately
gauge
the
volume?
That's
actually
moving?
B
Is
it
is
possible
to
have
to
have
irregular
readings
due
to
too
much
silt
build-up,
but
one
of
the
things
that's
good
about
this
type
of
system
is
we're
not
required
to
raise
the
floor
at
all.
As
with
the
other
type
of
flume
systems,
you
have
to
raise
the
floor,
and
this
is
seventh.
Avenue
has
a
very
shallow
and
nutshell,
but
shallow
sloped
main,
and
so
any
type
of
movement
in
that
would
throw
off
that
the
readings
on
the
other
type
of
systems.