2004-02-24_REVISION - M1977153 ‎(2)‎

• Permit No: M1977153
• IBM Index Class Name: Revision
• Doc Date: 2/24/2004
• Doc Name: Construct Slurry Wall
• From: Denver Water
• To: DRMS
• Type & Sequence: AM2
• Media Type: D
• Archive: No

6/2003
Information and Standards
The conditions of approval of a replacement well permit generally require that the old well be plugged and sealed according to
the Water Well Construction Rules. This form is provided to the well owner when a replacement permit is issued. The form
must be completed and submitted to the Division of Water Resources when the well has been plugged and sealed.
This form may be reproduced by photocopy or word processing means.
RULE 16 STANDARDS FOR PLUGGING, SEALING, AND ABANDONING WELLS AND BOREHOLES
16.1 General -The plugging, sealing and abandonment of all wells, monitoring and observation wells, monitoring and
observation holes and test holes that are no longer intended for use, and the plugging, sealing, and abandonment of dry holes,
collapsed or unusable boreholes, and other incomplete wells or excavations is necessary to prevent contamination of ground
water and the migration of water through the borehole. It is the ultimate responsibility of the well owner to have an existing well
properly plugged, sealed and abandoned. The well construction contractor or authorized individual is responsible for notifying
the well owner in writing of these plugging requirements.
16.1.1 In the event a borehole(s) is not completed for the intended purpose, the contractor will notify the well
owner of the well owner's responsibility for the proper abandonment of the borehole(s) according to Rule 16.1. If the well owner
does not agree to allow the contractor to abandon the borehole(s), the contractor shall notify the Board of Examiners, in writing,
of the existence of the borehole(s) and the contractor's effort to notify the well owner of the well owner's abandonment
responsibilities under Rule 16.1
16.1.2 Persons authorized to install pumping equipment may plug, seal and abandon wells that do not require the
removal of casing that penetrates more than one aquifer or the ripping or perforating of casing opposite confining layers.
16.1.3 Materials used for backfilling shall be clean, inert, and free from contaminants. The well casing may be cut
off below land surface so that it will not intertere with the anticipated use of the land. If the casing is cut off below land surface,
the uppermost five (5) feet of the remaining casing shall be filled with grout or a watertight cover shall be permanently attached
to the remaining casing and the excavation shall be filled with materials that are not more permeable than the surrounding soils
and adequately compacted to prevent settling.
16.2 Wells or Boreholes in Type II and Type III Aquifers -Wells completed into unconfined aquifers and
unconsolidated aquifers shall be plugged, sealed and abandoned by filling the well to the static water level with drill cuttings,
clean sand or clean gravel, then with clean native clays, cement or high solid bentonite grout to the ground surface. The
uppermost five (5) feet of casing shall be filled with grout or a permanent watertight cover shall be installed at the top of the
casing. If casing is removed, the hole shall be filled as described above to within five (5) feet of the ground surface. The top five
(5) feet of the hole shall be flied with materials less permeable than the surrounding soils that are adequately compacted to
prevent settling.
16.2.1 Dewatering wells, horizontal drains, monitoring and observation holes, percolation holes, piezometer holes,
sumps, test holes and dry holes shall be plugged, sealed, and abandoned either pursuant to Rule 16.2 or by removing all casing
that was installed and by filling the hole(s) with drill cuttings, clean native clays, cement or high solid bentonite grout to within five
(5) feet of the ground surface. The top five (5) feet of the hole shall be filled with materials less permeable than the surrounding
soils that are adequately compacted to prevent settling.
16.3 Wells or Boreholes in Type (Aquifers -Wells which were constructed through more than one aquifer shall be
plugged and sealed by placing a cement grout plug at the confining layer above each aquifer. If records do not show that the
casing opposite each confining layer has been grouted when originally installed, the casing shall be either completely removed
from the hole, or perforated or ripped opposite such layer prior to placing the grout plug. Plugs shall be no less than forty (40)
feet in length and shall be designed to withstand the maximum potential hydrostatic pressure differential between the aquifers.
The well casing, except for the grout plug intervals, shall be completely filled to the land surface with clean native clays, cement
or high solid bentonite grout. A watertight cover shall be permanently welded or attached to the top of the casing.
If ou have uestions, contact the Denver or the Division Office where our well is located.
Division 1 Division 2 Division 3 Division 4
810 9'" St. 2ntl Floor 310 E. Abriendo Ave Ste B 301 Murphy Drive 1871 East Main St.
Greeley, CO 80631 Pueblo, CO 81004 Alamosa, CO 81101 Montrose, CO 81402
[phone] [phone] [phone] [phone]
Fax [phone] Fax [phone] Fax [phone] Fax [phone]
Division 5 Division 6 Division 7 Denver Office
Direct mail to Box 396 Direct mail to Box 773450 701 Camino Del Rio Ste. 205 1313 Sherman St. Rm. 818
Glenwood Spgs CO 81602 505 Anglers Dr. Suite 101 Durango, CO 81301 Denver, CO 80203
50633 U.S. Hwy 6 & 24 Steamboat Spgs, CO [phone] [phone]
Glenwood Spgs, CO 81601 80477 Fax [phone] Fax [phone]
[phone] [phone]
Fax [phone] Call First Fax [phone]
02225 SUPPLEMENT 1 ABANDONING OBSERVATION WELLS