| (3) Springs and similar sources shall be constructed
in a manner which will preclude the entrance of surface water and
debris.
(A) The site shall be fine graded so that it is free
from depressions, reverse grades, or areas too rough for proper ground
maintenance in order to ensure that surface water will drain away
from the source.
(B) The spring or similar source shall be encased in
an open-bottomed, watertight basin which intercepts the flowing water
below the surface of the ground. The basin shall extend at least 18
inches above ground level. The top of the basin shall also be at least
two feet above the highest known watermark or 100-year flood elevation,
if available, or adequately protected from possible flood damage by
levees.
(C) In all cases, a concrete sealing block shall be
provided which extends at least three feet from the encasement in
all directions. The sealing block shall be at least six inches thick
and be sloped to drain away from the encasement at not less than 0.25
inches per foot.
(D) The top of the encasement shall be provided with
a sloped, watertight roof which prevents the ponding of water and
precludes the entrance of animals, insects, and other sources of contamination.
(E) The roof of the encasement shall be provided with
a hatch that is not less than 30 inches in diameter. The hatch shall
have a raised curbing at least four inches in height with a lockable
cover that overlaps the curbing at least two inches in a downward
direction. Where necessary, a gasket shall be used to make a positive
seal when the hatch is closed. All hatches shall remain locked except
during inspections and maintenance.
(F) The encasement shall be provided with a gooseneck
vent or roof ventilator which is equipped with approved screens to
prevent entry of animals, birds, insects, and heavy air contaminants.
Screens shall be fabricated of corrosion-resistant material and shall
be 16-mesh or finer. Screens shall be securely clamped in place with
stainless or galvanized bands or wires.
(G) The encasement shall be provided with an overflow
which is designed to prevent the entry of animals, birds, insects,
and debris. The discharge opening of the overflow shall be above the
surface of the ground and shall not be subject to submergence.
(4) Springs and similar sources must be provided with
the appurtenances required by subsection (c)(3)(L) - (Q) of this section.
(5) All systems with new springs or similar sources
must monitor microbiological source water quality at the new springs
or similar sources in accordance with §290.111 of this title
(relating to Surface Water Treatment) on a schedule determined by
the executive director. The system must notify the agency of the new
spring or similar source prior to construction. The executive director
may waive these requirements if the spring or similar source has been
determined not to be under the direct influence of surface water.
(e) Surface water sources and development.
(1) To determine the degree of pollution from all sources
within the watershed, an evaluation shall be made of the surface water
source in the area of diversion and its tributary streams. The area
where surface water sources are diverted for drinking water use shall
be evaluated and protected from sources of contamination.
(A) Where surface water sources are subject to continuous
or intermittent contamination by municipal, agricultural, or industrial
wastes and/or treated effluent, the adverse effects of the contamination
on the quality of the raw water reaching the treatment plant shall
be determined by site evaluations and laboratory procedures.
(B) The disposal of all liquid or solid wastes from
any source on the watershed must be in conformity with applicable
regulations and state statutes.
(C) Shore installations, marinas, boats and all habitations
on the watershed shall be provided with satisfactory sewage disposal
facilities. Septic tanks and soil absorption fields, tile or concrete
sanitary sewers, sewer manholes, or other approved toilet facilities
shall not be located in an area within 75 feet horizontally from the
lake water surface at the uncontrolled spillway elevation of the lake
or 75 feet horizontally from the 50-year flood elevation, whichever
is lower.
(D) Disposal of wastes from boats or any other watercraft
shall be in accordance with §§321.1 - 321.11 of this title
(relating to Boat Sewage Disposal).
(E) Pesticides or herbicides which are used within
the watershed shall be applied in strict accordance with the product
label restrictions.
(F) Before approval of a new surface water source,
the system shall provide the executive director with information regarding
specific water quality parameters of the potential source water. These
parameters are pH, total coliform, Escherichia coli, turbidity, alkalinity,
hardness, bromide, total organic carbon, temperature, color, taste
and odor, regulated volatile organic compounds, regulated synthetic
organic compounds, regulated inorganic compounds, and possible sources
of contamination. If data on the incidence of Giardia cysts and Cryptosporidium
oocysts has been collected, the information shall be provided to the
executive director. This data shall be provided to the executive director
as part of the approval process for a new surface water source.
(G) All systems with new surface water intakes or new
bank filtration wells must monitor microbiological source water quality
at the new surface water intakes or new bank filtration wells in accordance
with §290.111 of this title on a schedule determined by the executive
director. The system must notify the agency of the new surface water
intake or bank filtration well prior to construction.
(2) Intakes shall be located and constructed in a manner
which will secure raw water of the best quality available from the
source.
(A) Intakes shall not be located in areas subject to
excessive siltation or in areas subject to receiving immediate runoff
from wooded sloughs or swamps.
(B) Raw water intakes shall not be located within 1,000
feet of boat launching ramps, marinas, docks, or floating fishing
piers which are accessible by the public.
(C) A restricted zone of 200 feet radius from the raw
water intake works shall be established and all recreational activities
and trespassing shall be prohibited in this area. Regulations governing
this zone shall be in the city ordinances or the rules and regulations
promulgated by a water district or similar regulatory agency. The
restricted zone shall be designated with signs recounting these restrictions.
The signs shall be maintained in plain view of the public and shall
be visible from all parts of the restricted area. In addition, special
buoys may be required as deemed necessary by the executive director.
Provisions shall be made for the strict enforcement of such ordinances
or regulations.
(D) Commission staff shall make an on-site evaluation
of any proposed raw water intake location. The evaluation must be
requested prior to final design and must be supported by preliminary
design drawings. Once the final intake location has been selected,
the executive director shall be furnished with an original or legible
copy of a United States Geological Survey 7.5-minute topographic quadrangle
showing the accurate intake location.
(E) Intakes shall be located and constructed in a manner
which will allow raw water to be taken from a variety of depths and
which will permit withdrawal of water when reservoir levels are very
low. Fixed level intakes are acceptable if water quality data is available
to establish that the effect on raw water quality will be minimal.
(F) Water intake works shall be provided with screens
or grates to minimize the amount of debris entering the plant.
(G) Intakes shall not be located within 500 feet of
a sewage treatment plant or lands irrigated with sewage effluent.
(3) The raw water pump station shall be located in
a well-drained area and shall be designed to remain in operation during
flood events.
(4) An all weather road shall be provided to the raw
water pump station.
(5) The raw water pump station and all appurtenances
must be installed in a lockable building that is designed to prevent
intruder access or enclosed by an intruder-resistant fence with lockable
gates.
(f) Weatherization. All critical components necessary
for the continuous provision of raw water from the source must be
protected from adverse weather conditions.
|
| Source Note: The provisions of this §290.41 adopted to be effective October 1, 1992, 17 TexReg 6455; amended to be effective November 3, 1995, 20 TexReg 8620; amended to be effective September 13, 2000, 25 TexReg 8880; amended to be effective May 16, 2002, 27 TexReg 4127; amended to be effective February 19, 2004, 29 TexReg 1373; amended to be effective January 9, 2008, 33 TexReg 198; amended to be effective May 15, 2011, 36 TexReg 2860; amended to be effective September 11, 2014, 39 TexReg 7145; amended to be effective July 30, 2015, 40 TexReg 4769; amended to be effective December 21, 2023, 48 TexReg 7585 |
