Section 21-1819. WELL CONSTRUCTION REQUIREMENTS: WELL DEVELOPMENT

 

1819.1A 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.

 

1819.2Well development shall consist of cyclic or intermittent pumping, surging, or both, either mechanically or by using potable water or air under pressure.

 

1819.3Well development shall continue until formation cuttings, mud, drilling fluids and additives are removed from the well.

 

1819.4Well development shall occur as soon as feasible following installation and after grout is firmly set, but no sooner than twenty-four (24) hours.

 

1819.5A 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.

 

authority

District Department of the Environment Establishment Act of 2005, effective February 15, 2006 (D.C. Law 16-51; D.C. Official Code §§ 8-151.01 et seq. (2013 Repl.)); the Water Pollution Control Act of 1984, effective March 16, 1985 (D.C. Law 5-188; D.C. Official Code §§ 8-103.01 et seq. (2013 Repl. & 2016 Supp.)) (the Water Pollution Control Act); and Mayor’s Order 2006-61, dated June 14, 2006.

source

Final Rulemaking published at 63 DCR 13424 (October 28, 2016).