037-4 Wyo. Code R. §§ 4-1 - Disinfection
(a) Each person who repairs, modifies, works
on, or otherwise affects the physical components of a well shall clean and
disinfect the pump, electrical wiring and controls, drop pipe, and all other
equipment each and every time the pump, electrical wiring and controls, drop
pipe, and other equipment is placed into the well. In addition, each person (or
crew) who performs the above tasks shall maintain at all times on every well
site, adequate chlorine compounds to disinfect the well in accordance with the
table found in Appendix A.
(b) The
well driller shall:
(i) Clean all casing,
tools, drilling equipment, and materials prior to beginning the drilling and
construction of every well.
(ii)
Clean all pumping equipment and well construction materials (including sand or
gravel used in an artificial filter-packed well) before placing them in the
well or borehole.
(iii) Ensure that
only potable water is used for drilling and for mixing of sealing
material.
(c) The pump
installer shall:
(i) Clean all pumping,
wiring, and other equipment prior to placement in the well.
(ii) Clean all materials that may come in
contact with down-hole equipment.
(d) All wells used for drinking or sanitary
use shall be disinfected after construction, reconditioning, or repair (e.g.,
submersible pump replacement) and before the well is placed into, or returned
to, service.
(i) Following drilling:
(A)If calcium hypochlorite is used, it shall
be slowly poured down the casing and at least 30 minutes shall pass to allow
the tablets to fall through the water and dissolve.
(B)If sodium hypochlorite is used, the
solution must reach all parts of the well. To accomplish this, a tube shall be
suspended through the well casing so that it reaches the bottom of the well.
After it reaches the well bottom, it shall be withdrawn as the sodium
hypochlorite solution is pumped through the tube.
(C) After the chlorine has been applied, the
well shall be surged at least three times to improve the mixing and induce
contact of the chlorinated water with the adjacent aquifer.
(ii) Following pump installation:
(A) Chlorine shall be introduced so that an
average chlorine residual of 100 mg/1 is in the entire volume of water in the
casing and all parts of the plumbing system (pump, drop-pipe, wiring, pitless
assembly, etc.) for a minimum contact period of not less than two (2) hours
(overnight is preferable) before flushing and ridding the chlorine solution
from the well.
(iii)See
Appendix A for mixing proportions. Chlorine compounds intended for home laundry
use, pool, or fountain use should not be used if they contain additives such as
antifungal agents, scents, etc.
Notes
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No prior version found.