In accordance with Rule 6.3 of the Water Well Construction Rules (2 CCR 402-2) (Rules) and the requirement of the State Engineer, Notice of Intent (Notice) must be provided before drilling any Test Hole that penetrates a confining layer and any Monitoring and Observation Hole or Dewatering Well. Notice is accomplished by submitting Form GWS-51(Monitoring and Observation Holes), or Form GWS-62 (Dewatering Wells), to the Division of Water Resources at least three (3) days and no more than ninety (90) days prior to construction. Faxed notices are acceptable.
All Monitoring and Observation Holes and Dewatering Wells must be constructed within 90 days of the reciept of the Notice by the State Engineer’s office. Multiple Notices may be filed for projects that require the installation of wells over more than one 90-day period.
There is no limit to the number of boreholes that may be drilled in the 40-acre ¼ - ¼ section for which the notice is submitted. Similarly, Notice must be provided for each 40-acre ¼ - ¼ in which a borehole will be drilled.
Pursuant to Section 37-91-102(15.7), C.R.S., a Test Hole is a ground penetration for the purpose of geotechnical, geophysical or geologic investigation or collecting soil or rock samples. Test Holes that penetrate through a confining layer must submit proper Notice of Intent before drilling. Test Holes shall not remain open longer than twenty (20) days and must be abandoned in accordance with the Water Well Construction Rules (2 CCR 402-2). An abandonment Report (Form GWS-9) must be submitted within sixty (60) days after abandoning any Test Hole that penetrates through a confining layer.
Pursuant to Rule 5.2.31 of the Water Well Construction Rules (2 CCR 402-2) (Rules) and the requirements of the State Engineer, Monitoring and Observation Holes are temporary wells constructed after proper Notice of Intent and in accordance with the Rules’ standards for construction. A Well Construction Report (Form GWS-31) referencing the acknowledged monitoring hole notice number must be submitted within sixty (60) days after constructing the hole.
Monitoring and Observation Holes must either be abandoned in accordance with the Rules within one (1) year of construction or converted to a well by obtaining a permit for a Monitoring Well, Recovery Well, or Dewatering system. If abandoned, a Well Abandonment Report (Form GWS-9) must be submitted within sixty (60) days after abandoning the hole.
Monitoring and Observation Holes may not be converted to any type of production well other than a Recovery Well or Dewatering System under any circumstances (Rule 9.6)
Monitoring and Observation Wells, pursuant to Section 37-91-102(10.5), C.R.S., are ground penetrations for the purpose of “locating such well, pumping equipment or aquifer testing, monitoring ground water, or collection of water quality samples”.
A Monitoring and Observation Well may be converted from an existing Monitoring and Observation Hole or by constructing the well after obtaining a permit. Monitoring and Observation Well permits are issued pursuant to 37-92-602, C.R.S., and may be obtained by submitting a Monitoring and Observation Well Permit Application (Form GWS-46).
Monitoring and Observation Wells converted from Monitoring and Observation Holes may only be permitted for the uses allowed for exempt monitoring wells in 37-92-602(1)(f), or 37-90-105(4)(a), C.R.S. or may be converted, by permit, to a Recovery Well or Dewatering System.
Monitoring and Observation Wells must be constructed either in compliance with or with an approved variance to the Water Well Construction Rules (2 CCR 402-2) (Rules). A Well Construction Report (Form GWS-31) must be submitted within sixty (60) days of completing the well. When the well is abandoned, the abandonment must be performed in accordance with the Rules, including the submission of a Well Abandonment Report (Form GWS-9) within sixty (60) days after abandoning the well.
Monitoring and Observation Wells may be converted to Recovery Wells or Dewatering Systems by submitting (Forms GWS-45). In order to convert a Monitoring and Observation Well to a production well, other than a Recovery Well or Dewatering System, the following three conditions must be met: 1) The well must have been constructed subsequent to obtaining a valid Monitoring and Observation Well permit; 2) the well was constructed by a licensed well construction contractor in accordance with the Rules applicable to the construction of a water well; and, 3) a permit to use ground water is obtained (Rule 14.2.2).
Recovery Well permits are issued pursuant to 37-90-137(2), or 37-90-107, C.R.S., for the purpose of removing contaminants from or otherwise remediating ground water.
Recovery Wells located in the alluvial aquifer of stream systems where water is not available for appropriation may be issued in accordance with Policy 94-5 of the State Engineer, depending upon the circumstances of the well and associated treatment system.
Use a General Purpose Permit Application (Form GWS-45) to apply for a new Recovery Well, to change the use of an existing Monitoring and Observation Well to a Recovery Well or to convert an existing Monitoring and Observation Hole to a Recovery Well.