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I'I Monitorin~ Well Installation. Six shallow monitoring wells ( 4 temporary
and 2
wells were installed for groundwater
permanent) and three deeper monitoring
wells were completed as temporary
sampling. The four remaining shallow monitoring
steel casing with 5- foot long
wells and were constrJcted of 2- inch stainless
i! Each of the shallow wells was installed
stainless steel wire- wrapped well points.
to an approximate depth of 15 feet
with a rotary drilling rig using hollow- stem
I
to an approximate depth of 40 feet
The deeper wells were each installed
Ic
il
augers.
using hollow stem augers. All permanent
wells were completed with 10- foot slotted
schedule 40 polyvinyl chloride ( PVC)
PVC screens constructed of 2- inch- diameter
screen interval was filter
material. The well borehole annulus opposite each
I; ! j packed with 20/ 30 grade silica
sand. In each well completion the filter pack
seal, which for the permanent wells, was followed
was
topped with a I- foot bentonite
to land surface. Each temporary well' s annular space
by portland cement grout to form
again topped with bentonite
I was then backfilled with auger cuttings
a surface seal.
and
Permanent well surface completion
consisted of steel above - grade
concrete
was embedded in a 2- foot square
well protector with locking cover that
above- locking well protector
Temporary wells were completed
with an grade
II pad.
that was embedded in the surface bentonite
seal. They were also completed as
constructed of 2- inch- diameter PVC. Upon completion,
permanent wells and were sediment- free
each well was developed with centrifugal pump
until it produced
II water. Well data can be found in Table 4.
completion
ABB- ES obtained permits for proper
After the completion of the sampling program, Northwest Florida Water
wells from the
abandonment of the temporary monitoring
The temporary wells were abandoned by removal and
Management District ( NWFWMD). specifica-
in accordance with NWFWMD
grouting the borehole with Portland cement
tions.
monitoring wells, the three
The new pre- existing onsite
Groundwater Sarnplin~. and
well at Waste Management Systems,
monitoring wells, a pre- existing monitoring The groundwater
11 the city production well were sampled
sample locations are described in Table
for laboratory analysis.
3 and illustrated in Figure 3.
were collected after the
well was purged with
Each of the monitoring well samples
Ir,'j a with a TeflonN bailer.
The samples for organics analysis
from
were collected with
monitoring wells for metals
a Teflon~ bailer. Sample fractions collected The
with a peristaltic pump using new TeflonN tubing.
analysis were collected
II production well was sampled
a
from the spigot nearest the well.
minimum of four well volumes
of water was from each
Prior to sampling,
well. In addition,
purged
parameters field
to confirm
