D.C. Mun. Regs. tit. 21, r. 21-1819

Current through Register Vol. 71, No. 49, December 6, 2024

Rule 21-1819 - WELL CONSTRUCTION REQUIREMENTS: WELL DEVELOPMENT

1819.1

A well constructed for the purpose of determining the physical or chemical characteristics of groundwater shall be developed in accordance with the requirements of this section.

1819.2

Well development shall consist of cyclic or intermittent pumping, surging, or both, either mechanically or by using potable water or air under pressure.

1819.3

Well development shall continue until formation cuttings, mud, drilling fluids and additives are removed from the well.

1819.4

Well development shall occur as soon as feasible following installation and after grout is firmly set, but no sooner than twenty-four (24) hours.

1819.5

A well shall be developed to remove the fine sands, silts, clays, and rock particles from the aquifer surrounding the well screen or intake interval, to meet the following requirements:

(a) The water recovered from the well shall contain less than five milligrams (5 mg) of sand or larger particles per liter of water. Particles with a diameter between 0.0625 and 2.0 millimeters shall be considered sands;

(b) The water recovered from the well shall have a turbidity of less than twenty (20) NTU (Nephelometric Turbidity Units), except when the turbidity is due to the oxidation of dissolved iron or manganese naturally occurring in the water; and

(c) The pH, specific conductivity, temperature, and turbidity of the water recovered from the well are determined to be within a ten percent (10%) range and considered at equilibrium.

D.C. Mun. Regs. tit. 21, r. 21-1819

Final Rulemaking published at 63 DCR 13424 (10/28/2016)