Ala. Admin. Code r. 335-7-15-.09

Current through Register Vol. 43, No. 1, October 31, 2024

Section 335-7-15-.09 - Observation Wells

For community water systems an observation well/wells shall be constructed at an appropriate distance from the production well, to facilitate determination of the storage coefficient and transmissivity during the aquifer test.

(a) A temporary or test well may be used as the observation well if satisfactory information can be obtained.

(b) If the temporary well is converted to the production well, an observation well must be installed at an appropriate distance from the production well or at an alternate distance approved by the Department.

(c) The observation well shall be a minimum of two inches in diameter and shall penetrate the strata utilized by the production well or wells.

(d) The observation well screen shall be placed at approximately the same depth as the central portion of the screened zone or zones in the production well.

(e) Construction of the observation well shall be according to the latest edition of the ASTM Subcommittee D18.21, Design and Installation of Groundwater Monitoring Wells in Aquifers.

(f) Storage coefficient and other aquifer characteristics determined for existing wells in a Coastal Plain Province well field, may be used for delineating the SWAA areas for an additional well in the well field if constructed similar to others in the well field.

(g) If the SWAA can be determined without constructing an observation well, a request for an exemption from constructing an observation well may be requested after submittal of all supporting information.

Ala. Admin. Code r. 335-7-15-.09

New Rule: Filed November 7, 2005; effective December 12, 2005. Amended: Filed December 18, 2007; effective January 22, 2008.

Authors: Edgar K. Hughes, Dennis D. Harrison

Statutory Authority:Code of Ala. 1975, §§ 22-23-33, 22-23-49, 22-22A-5, 22-22A-6.