Current through Register Vol. 50, No. 9, September 20, 2024
A. A
source water protection plan enacted for continued protection of the watershed
from potential sources of contamination shall be provided as determined by the
state health officer. Surface water includes sources of water supply such as,
but not limited to:
1. all streams;
2. tributary streams;
3. drainage basins,
4. natural and man-made ponds and lakes;
and
5. artificial reservoirs or
impoundments.
B. Surface
Water Quantity. The quantity of water at the source shall be adequate to meet
the maximum projected water demand of the service area as shown by calculations
based on a 1 in 50 year drought or the extreme drought of record, and should
include consideration of multiple year droughts. Requirements for minimum flows
downstream of the intake shall:
1. comply
with requirements of the appropriate reviewing authority/authorities;
2. provide a reasonable surplus for
anticipated growth;
3. be adequate
to compensate for all losses such as silting, evaporation, seepage, etc;
and
4. be adequate to provide ample
water for other legal users of the source.
C. Surface Water Quality. A study shall be
made of the factors, both natural and man-made, which may affect water quality
in the water supply stream, river, lake or reservoir and shall include, but not
be limited to:
1. determining possible future
uses of impoundments or reservoirs;
2. determining degree of control of watershed
by owner;
3. assessing degree of
hazard to the supply posed by agricultural, domestic, industrial, or
recreational activities in the watershed, which may generate toxic or harmful
substances detrimental to treatment processes;
4. assessing all waste discharges (point
source and non-point sources) and activities that could impact the water
supply. The location of each waste discharge shall be shown on a scale
map;
5. obtaining samples over a
sufficient period of time to assess the microbiological, physical, chemical and
radiological characteristics of the water;
6. assessing the capability of the proposed
treatment process to reduce contaminants to applicable standards; and
7. consideration of currents, wind and ice
conditions, salt water wedges/intrusion and the effect of confluencing
streams.
D. Structures.
Structures shall be designed in accordance with the following requirements.
1. The design of intake structures shall
provide for:
a. withdrawal of water from more
than one level if quality varies with depth, as determined by the state health
officer;
b. separate facilities for
release of less desirable water held in storage;
c. inspection of manholes every 1000 feet for
pipe sizes large enough to permit visual inspection;
d. occasional cleaning of the inlet
line;
e. adequate protection
against rupture by dragging anchors, ice, etc.;
f. ports located above the bottom of the
stream, lake or impoundment, but at sufficient depth to be kept submerged at
low water levels;
g. where shore
wells are not provided, a diversion device capable of keeping large quantities
of fish or debris from entering an intake structure; and
h. when buried surface water collectors are
used, sufficient intake opening area must be provided to minimize inlet
headloss. Particular attention should be given to the selection of backfill
material in relation to the collector pipe slot size and gradation of the
native material over the collector system.
2. Raw water pumping wells shall:
a. have motors and electrical controls
located above grade, and protected from flooding as required by the state
health officer;
b. be
accessible;
c. be designed against
flotation;
d. be equipped with
removable or traveling screens before the pump suction well;
e. provide for introduction of chlorine or
other chemicals in the raw water transmission main if necessary for quality
control;
f. have intake valves and
provisions for backflushing or cleaning by a mechanical device and testing for
leaks, where practical;
g. have
provisions for withstanding surges where necessary; and
h. be constructed in a manner to prevent
intrusion of contaminants.
3. Off Stream Raw Water Storage Reservoirs.
An off-stream raw water storage reservoir is a facility into which water is
pumped during periods of good quality and high stream flow for future release
to treatment facilities. The off-stream raw water storage reservoirs shall be
constructed to assure that:
a. water quality
is protected by controlling runoff into the reservoir;
b. dikes are structurally sound and protected
against wave action and erosion;
c.
intake structures and devices meet requirements of §167. D 1;
d. point of influent flow is separated from
the point of withdrawal;
e.
separate pipes are provided for influent to and effluent from the reservoir;
and
f. a bypass line is provided
around the reservoir to allow direct pumping to the treatment
facilities.
E. Nuisance Plant or Animal. If it is
determined that chemical treatment is warranted for the control of nuisance
plants or animals treatment shall be in accordance with Subchapter D of Chapter
1 of this Part and shall be acceptable to the state commissioner of agriculture
and the state health officer. In addition, the following requirements shall be
met.
1. Chemical treatment shall be in
accordance with the manufacturers label and application instructions, the
Louisiana Pesticide Law (R.S.
3:3201, et seq.) and its implementing rules
and regulations [see LAC Title 7 (Agriculture and Animals), Part XXIII
(Pesticides) including, but not limited to, Chapter 31 (Water Protection)], LAC
Title 51 (Public Health-Sanitary Code) Part XII (Water Supplies).
2. Chemical treatment shall be performed in
such a manner as to prevent a USEPA (or state-equivalent) maximum contaminant
level of a primary drinking water contaminant to be exceeded in finished
drinking water.
3. Any analyses of
finished drinking water to confirm whether or not a USEPA (or state-equivalent)
maximum contaminant level of a primary drinking water contaminant has been
exceeded shall only be acceptable if the water sample is collected, transported
and stored in accordance with USEPA-approved methods [see 40 CFR Part 136.3, Table II] and then analyzed by a LDH - Certified Chemical Laboratory/Drinking
Water.
4. In all cases involving a
pesticide application for nuisance plant or animal control, when the water
being treated is a source of water supply, the final determination of the
safety of finished drinking water shall be made exclusively by the state health
officer
a. Facility safety items, including
but not limited to ventilation, operator protective equipment,
eyewashes/showers, cross connection control, etc. shall be provided;
b. Solution piping and diffusers shall be
installed within the intake pipe or in a suitable carrier pipe.
c. Provisions shall be made to prevent
dispersal of chemical into the water environment outside the intake. Diffusers
shall be located and designed to protect all intake structure
components;
d. A spare solution
line should be installed to provide redundancy and to facilitate the use of
alternate chemicals;
e. The
chemical feeder shall be interlocked with plant system controls to shut down
automatically when the raw water flow stops;
f. when alternative control methods are
proposed for nuisance plant and animal control, appropriate piloting or
demonstration studies, satisfactory to the state health officer, may be
required.
F.
Impoundments and Reservoirs. Site preparation of impoundments and reservoirs
shall provide where applicable:
1. removal of
brush and trees to high water elevation;
2. protection from floods during
construction;
3. abandonment of all
wells which will be inundated, in accordance with requirements of the
Department of Natural Resources, Office of Conservation, and the state health
officer.
AUTHORITY NOTE:
Promulgated in accordance with the provisions of
R.S.
40:4.A.(8), 40:4.13.D.(1)(2) and
40:5.A.(2)(3)(5)(6)(7)(17).
