| (I) The well site shall be fine graded so that the
site is free from depressions, reverse grades, or areas too rough
for proper ground maintenance so as to ensure that surface water will
drain away from the well. In all cases, arrangements shall be made
to convey well pump drainage, packing gland leakage, and floor drainage
away from the wellhead. Suitable drain pipes located at the outer
edge of the concrete floor shall be provided to collect this water
and prevent its ponding or collecting around the wellhead. This wastewater
shall be disposed of in a manner that will not cause any nuisance
from mosquito breeding or stagnation. Drains shall not be directly
connected to storm or sanitary sewers.
(J) In all cases, a concrete sealing block extending
at least three feet from the well casing in all directions, with a
minimum thickness of six inches and sloped to drain away at not less
than 0.25 inches per foot shall be provided around the wellhead.
(K) Wellheads and pump bases shall be sealed by a gasket
or sealing compound and properly vented to prevent the possibility
of contaminating the well water. A well casing vent shall be provided
with an opening that is covered with 16-mesh or finer corrosion-resistant
screen, facing downward, elevated and located so as to minimize the
drawing of contaminants into the well. Wellheads and well vents shall
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.
(L) If a well blow-off line is provided, its discharge
shall terminate in a downward direction and at a point which will
not be submerged by flood waters.
(M) A suitable sampling cock shall be provided on the
discharge pipe of each well pump prior to any treatment.
(N) Flow-measuring devices shall be provided for each
well to measure production yields and provide for the accumulation
of water production data. These devices shall be located to facilitate
daily reading.
(O) All completed well units shall be protected by
intruder-resistant fences, the gates of which are provided with locks
or shall be enclosed in locked, ventilated well houses to exclude
possible contamination or damage to the facilities by trespassers.
The gates or wellhouses shall be locked during periods of darkness
and when the plant is unattended.
(P) An all-weather access road shall be provided to
each well site.
(Q) If an air release device is provided on the discharge
piping, it shall be installed in such a manner as to preclude the
possibility of submergence or possible entrance of contaminants. In
this respect, all openings to the atmosphere shall be covered with
16-mesh or finer, corrosion-resistant screening material or an acceptable
equivalent.
(4) Pitless units may be desirable in areas subject
to vandalism or extended periods of subfreezing weather.
(A) Pitless units shall be shop fabricated from the
point of connection with the well casing to the unit cap or cover,
be threaded or welded to the well casing, be of watertight construction
throughout, and be of materials and weight at least equivalent and
compatible to the casing. The units must have a field connection to
the lateral discharge from the pitless unit of threaded, flanged,
or mechanical joint connection.
(B) The design of the pitless unit shall make provisions
for an access to disinfect the well, a properly designed casing vent,
a cover at the upper terminal of the well that will prevent the entrance
of contamination, a sealed entrance connection for electrical cable,
and at least one check valve within the well casing. The unit shall
have an inside diameter as great as that of the well casing up to
and including casing diameters of 12 inches.
(C) If the connection to the casing is by field weld,
the shop-assembled unit must be designed specifically for field welding
to the casing. The only field welding permitted will be that needed
to connect a pitless unit to the well casing.
(D) With the exception of the fact that the well was
constructed using a pitless unit, the well must otherwise meet all
of the requirements of paragraph (3) of this subsection.
(d) Springs and other water sources.
(1) Springs and other similar sources of flowing artesian
water shall be protected from potential contaminant sources in accordance
with the requirements of subsection (c)(1) of this section.
(2) Before placing the spring or similar source into
service, completion data similar to that required by subsection (c)(3)(A)
of this section must be submitted to the executive director for review
and approval to the Texas Commission on Environmental Quality, Water
Supply Division, MC 159, P.O. Box 13087, Austin, Texas 78711-3087.
(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.
|
| 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 |
