R309-515-5. Surface Water Sources

  (1) Definition.

  A surface water source, as is defined in R309-110, shall include, but not be limited, to tributary systems, drainage basins, natural lakes, artificial reservoirs, impoundments and springs or wells that have been classified as being directly influenced by surface water. Surface water sources will not be considered for culinary use unless they can be rendered acceptable by conventional surface water treatment or other equivalent treatment techniques acceptable to the Director.

  (2) Pre-design Submittal.

  The following information must be submitted to the Director and approved in writing before commencement of design of diversion structures and/or water treatment facilities:

  (a) a copy of the chemical analyses required by R309-200 and described in R309-515-4(5) above; and,

  (b) a survey of the watershed tributary to the watercourse along which diversion structures are proposed. The survey shall include, but not be limited to:

  (i) determining possible future uses of impoundments or reservoirs;

  (ii) the present stream classification by the Division of Water Quality, any obstacles to having stream(s) reclassified 1C, and determining degree of watershed control by owner or other agencies;

  (iii) assessing degree of hazard to the supply by accidental spillage of materials that may be toxic, harmful or detrimental to treatment processes;

  (iv) obtaining samples over a sufficient period of time to assess the microbiological, physical, chemical and radiological characteristics and variations of the water;

  (v) assessing the capability of the proposed treatment process to reduce contaminants to applicable standards; and,

  (vi) consideration of currents, wind and ice conditions, and the effect of tributary streams at their confluence.

  (3) Pre-construction Submittal.

  Following approval of a surface water source, the following additional information must be submitted for review and approval prior to commencement of construction:

  (a) acceptable evidence that the water system has a legal right to divert water for the proposed uses from the proposed sources;

  (b) minimum quantity that the surface water source is capable of producing (see R309-515-5(4)(a) below); and

  (c) complete plans and specifications and supporting documentation for the proposed treatment facilities to ascertain compliance with R309-525 or R309-530.

  (4) Quantity.

  The quantity of water from surface sources shall:

  (a) be assumed to be no greater than the low flow of a 25-year recurrence interval or the low flow of record for these sources when 25 years of records are not available;

  (b) meet or exceed the anticipated peak day demand for water as estimated in R309-510-7 and provide a reasonable surplus for anticipated growth; and,

  (c) be adequate to compensate for all losses such as silting, evaporation, seepage, and sludge disposal, which would be anticipated in the normal operation of the treatment facility.

  (5) Diversion Structures.

  Design of intake structures shall provide for:

  (a) withdrawal of water from more than one level if quality varies with depth;

  (b) intake of lowest withdrawal elevation located at sufficient depth to be kept submerged at the low water elevation of the reservoir;

  (c) separate facilities for release of less desirable water held in storage;

  (d) occasional cleaning of the inlet line;

  (e) a diversion device capable of keeping large quantities of fish or debris from entering an intake structure; and,

  (f) suitable protection of pumps where used to transfer diverted water (refer to R309-540-5).

  (6) Impoundments.

  The design of an impoundment reservoir shall provide for, where applicable:

  (a) removal of brush and trees to the high water level;

  (b) protection from floods during construction;

  (c) abandonment of all wells, which may be inundated (refer to applicable requirements of the Division of Water Rights); and,

  (d) adequate precautions to limit nutrient loads.