(1) General Design
Considerations.
(a) For Class I wells,
associated on-site, cluster, multihorizon, or annular monitoring wells shall
not penetrate the injection zone or final confining bed.
(b) For satellite and regional monitor wells
associated with Class I wells, cluster or multihorizon monitoring wells shall
be allowed to penetrate the injection zone or final confining bed only if the
applicant demonstrates that the underground sources of drinking water and
confining strata will be protected, the integrity of the monitoring and
injection well system will be protected, and the well is designed in such a way
that it can be easily repaired.
(c)
All monitoring wells constructed for Class III injection operations shall be
constructed in accordance with Chapter 62-532, F.A.C.
(d) Department approval by permit
modification is required prior to any remedial procedures that alter the basic
design specifications.
(2) Exploratory Pilot Hole.
For Class I wells, the Department shall require an
exploratory pilot hole and shall require that the hole be drilled in stages.
The Department shall waive the requirements of this subsection if the applicant
can demonstrate that they are not needed to protect underground sources of
drinking water and that waiving the requirements will not adversely affect the
successful construction or operation of the monitor well.
(3) Drilling.
The Department shall require that a step-by-step drilling
plan be submitted with the design specifications.
(4) Casings and Tubing.
(a) The casings or tubing used in the
construction of each newly drilled well shall be designed for the life
expectancy of the well.
(b) The
number, thickness, type of material, and length of casing or tubing shall be
sufficient to protect the quality of drinking water resources and the integrity
of the well and confining strata. The type of materials used in the monitoring
well shall not bias the sampling parameters used in the monitoring
program.
(c) Exact setting depths
for all casings or monitor tubing shall be determined from field data, based on
all available information. Department approval shall be obtained prior to
installation of the monitor casing. In order to obtain approval, the permittee
shall submit a request to the Department. The Department shall approve the
request if the proposed setting depth of the casing or tubing meets the
monitoring requirements of this chapter and will not adversely affect the
operation of the injection well.
(5) Cementing.
(a) The applicant shall submit the proposed
cementing program with the design specifications. The cement used in the
construction of each newly drilled well shall be designed for the life
expectancy of the well. The applicant shall submit a list of proposed additives
with the construction permit application.
(b) Cement must be compatible with the native
fluids and the formation, but in no case less than the quality of American
Society for Testing and Materials Type 2 or its equivalent (Standard
Specification for Portland Cement, American National Standards
Institute/American Society for Testing and Materials C 150-94, 1994).
(c) Cement placement shall be in such a
manner that the purposes and characteristics of the cement are retained, and
shall be in accordance with "AWWA Standard for Water Wells", American Water
Works Association A100-90, 1990.
(d) The applicant shall submit his cement
testing program with the permit application for Department approval.
(e) For Class I monitor wells other than
annular monitor wells, a nominal thickness of 2.5 inches of cement surrounding
the casings with not less than five inches of overdrill is required, except for
the annulus being used for monitoring in wells with open annulus
monitoring.
(f) All casings and
tubing shall be centralized where possible to ensure uniform
cementing.
(g) All outer surfaces
of casing or tubing which are uncemented shall be protected from corrosion for
a minimum of thirty feet above and below the uncemented
portion.
(6) Testing of
Monitoring Well Construction.
Test to be considered by the applicant shall include:
(a) Cement evaluation survey.
(b) Temperature survey.
(c) Oxygen activation log.
(d) Noise log.
(e) Pressure test to at least 1.5 times the
expected ultimate monitoring pressure but not less than 50 pounds per square
inch for one hour.
(f) A pumping
test to determine if the monitor well has sufficient capacity to yield a
representative ground water sample.
(g) Chemical analyses of water from strata
tapped by well.
(h) Water level
measurement referenced to National Geodetic Vertical Datum (NGVD) of
1929.
