Current through Register Vol. 54, No. 44, November 2, 2024
(a) Monitoring wells shall be cased as
follows:
(1) The casing shall maintain the
integrity of the monitoring well borehole and shall be constructed of material
that will not react with the groundwater being monitored.
(2) The minimum casing diameter shall be 4
inches unless otherwise approved by the Department in writing.
(3) The well shall be constructed with a
screen that meets the following requirements:
(i) The screen shall be
factory-made.
(ii) The screen may
not react with the groundwater being monitored.
(iii) The screen shall maximize open area to
minimize entrance velocities and allow rapid sample recovery.
(4) The well shall be
filter-packed with chemically inert clean quartz sand, silica or glass beads.
The material shall be well rounded and dimensionally stable.
(5) The casing shall be clearly visible and
protrude at least 1 foot above the ground, unless the Department has approved
flush mount wells.
(6) The annular
space above the sampling depth shall be sealed to prevent contamination of
samples and the groundwater.
(7)
The casing shall be designed and constructed in a manner that prevents cross
contamination between surface water and groundwater.
(8) Alternative casing designs for wells in
stable formations may be approved by the Department.
(b) Monitoring well casings shall be enclosed
in a protective casing that shall:
(1) Be of
sufficient strength to protect the well from damage by heavy equipment and
vandalism.
(2) Be installed for at
least the upper 10 feet of the monitoring well, as measured from the well cap,
with a maximum stick up of 3 feet, unless otherwise approved by the Department
in writing.
(3) Be grouted and
placed with a concrete collar at least 3 feet deep to hold it firmly in
position.
(4) Be numbered for
identification with a label capable of withstanding field conditions and
painted in a highly visible color.
(5) Protrude above the monitoring well
casing.
(6) Have a locked
cap.
(7) Be made of steel or
another material of equivalent strength.
This section cited in 25 Pa. Code §
287.102 (relating to
permit-by-rule); 25 Pa. Code §
289.123 (relating to groundwater
quality description); 25 Pa. Code §
289.152 (relating to water quality
monitoring plan); 25 Pa. Code §
289.261 (relating to general
requirements); 25 Pa. Code §
289.266 (relating to groundwater
assessment plan); and 25 Pa. Code §
299.144 (relating to operating
requirements).
