All Class V aquifer recharge (AR) injection wells shall be
designed, constructed, completed, and closed to prevent commingling,
through the wellbore and casing, of injection waters with other fluids
outside of the authorized injection zone; mixing through the wellbore
and casing of fluids from aquifers of substantively different water
quality; and infiltration through the wellbore and casing of water
from the surface into groundwater zones.
(1) Plans and specifications. Except as specifically
required in the terms of the Class V AR injection well authorization,
the drilling and completion of a Class V AR injection well shall be
done in accordance with the requirements of §331.132 of this
title (relating to Construction Standards) and the closure of a Class
V AR injection well shall be done in accordance with the requirements
of §331.133 of this title (relating to Closure Standards for
Injection Wells).
(A) If the project operator proposes to change the
injection interval to one not reviewed and approved during the authorization
process, the project operator shall notify the executive director
immediately. The project operator may not inject into any unauthorized
zone without prior written approval from the executive director.
(B) The executive director shall be notified immediately
of any other changes, including but not limited to, changes in the
completion of the AR injection well, changes in the setting of screens,
and changes in the injection intervals within the authorized injection
zone.
(2) Construction materials. Casing materials for Class
V AR injection wells shall be constructed of materials resistant to
corrosion.
(3) Construction and workover supervision. All phases
of any AR injection well construction, workover or closure shall be
supervised by qualified individuals who are knowledgeable and experienced
in practical drilling engineering, as applicable, and who are familiar
with the special conditions and requirements of injection well and
water well construction.
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