| (26) Drinking water standards--The commission rules
covering drinking water standards in Subchapter F of this chapter
(relating to Drinking Water Standards Governing Drinking Water Quality
and Reporting Requirements for Public Water Systems).
(27) Elevated storage capacity--That portion of water
which can be stored at least 80 feet above the highest service connection
in the pressure plane served by the storage tank.
(28) Emergency operations--The operation of an affected
utility during an extended power outage at a minimum water pressure
of 20 pounds per square inch (psi) or a pressure approved by the executive
director as required under TWC §13.1394 and 35 psi as required
under TWC §13.1395.
(29) Emergency power--Either mechanical power or electric
generators which can enable the system to provide water under pressure
to the distribution system in the event of a local power failure.
With the approval of the executive director, dual primary electric
service may be considered as emergency power in areas which are not
subject to large scale power outages due to natural disasters.
(30) Extended power outage--A power outage lasting
for more than 24 hours.
(31) Filtrate--The water produced from a filtration
process; typically used to describe the water produced by filter processes
such as membranes.
(32) Flux--The throughput of a pressure-driven membrane
filtration system expressed as flow per unit of membrane area. For
example, gallons per square foot per day or liters per hour per square
meter.
(33) Grantee--For purposes of this chapter, any person
receiving an ownership interest in a public water system, whether
by sale, transfer, descent, probate, or otherwise.
(34) Grantor--For purposes of this chapter, any person
who conveys an ownership interest in a public water system, whether
by sale, transfer, descent, probate, or otherwise.
(35) Groundwater--Any water that is located beneath
the surface of the ground and is not under the direct influence of
surface water.
(36) Groundwater under the direct influence of surface
water--Any water beneath the surface of the ground with:
(A) significant occurrence of insects or other macroorganisms,
algae, or large-diameter pathogens such as Giardia
lamblia or Cryptosporidium;
(B) significant and relatively rapid shifts in water
characteristics such as turbidity, temperature, conductivity, or pH
which closely correlate to climatological or surface water conditions;
or
(C) site-specific characteristics including measurements
of water quality parameters, well construction details, existing geological
attributes, and other features that are similar to groundwater sources
that have been identified by the executive director as being under
the direct influence of surface water.
(37) Health hazard--A cross-connection, potential contamination
hazard, or other situation involving any substance that can cause
death, illness, spread of disease, or has a high probability of causing
such effects if introduced into the potable drinking water supply.
(38) Human consumption--Uses by humans in which water
can be ingested into or absorbed by the human body. Examples of these
uses include, but are not limited to drinking, cooking, brushing teeth,
bathing, washing hands, washing dishes, and preparing foods.
(39) Indirect integrity monitoring--The monitoring
of some aspect of filtrate water quality, such as turbidity, that
is indicative of the removal of particulate matter.
(40) Innovative/alternate treatment--Any treatment
process that does not have specific design requirements in §290.42(a)
- (f) of this title (relating to Water Treatment).
(41) Interconnection--A physical connection between
two public water supply systems.
(42) International Fire Code (IFC)--The standards of
the International Code Council.
(43) Intruder-resistant fence--A fence six feet or
greater in height, constructed of wood, concrete, masonry, or metal
with three strands of barbed wire extending outward from the top of
the fence at a 45 degree angle with the smooth side of the fence on
the outside wall. In lieu of the barbed wire, the fence must be eight
feet in height. The fence must be in good repair and close enough
to surface grade to prevent intruder passage.
(44) L/d ratio--The dimensionless value that is obtained
by dividing the length (depth) of a granular media filter bed by the
weighted effective diameter "d" of the filter media. The weighted
effective diameter of the media is calculated based on the percentage
of the total bed depth contributed by each media layer.
(45) Licensed professional engineer--An engineer who
maintains a current license through the Texas Board of Professional
Engineers in accordance with its requirements for professional practice.
(46) Log removal value (LRV)--Removal efficiency for
a target organism, particulate, or surrogate expressed as log10 (i.e.,
log10 (feed concentration) - log10 (filtrate concentration)).
(47) Maximum contaminant level (MCL)--The MCL for a
specific contaminant is defined in the section relating to that contaminant.
(48) Maximum daily demand--In the absence of verified
historical data or in cases where a public water system has imposed
mandatory water use restrictions within the past 36 months, maximum
daily demand means 2.4 times the average daily demand of the system.
(49) Membrane filtration--A pressure or vacuum driven
separation process in which particulate matter larger than one micrometer
is rejected by an engineered barrier, primarily through a size-exclusion
mechanism, and which has a measurable removal efficiency of a target
organism that can be verified through the application of a direct
integrity test; includes the following common membrane classifications
microfiltration (MF), ultrafiltration (UF), nanofiltration (NF), and
reverse osmosis (RO), as well as any "membrane cartridge filtration"
(MCF) device that satisfies this definition.
(50) Membrane LRVC-Test --The number that reflects
the removal efficiency of the membrane filtration process demonstrated
during challenge testing. The value is based on the entire set of
log removal values (LRVs) obtained during challenge testing, with
one representative LRV established per module tested.
(51) Membrane module--The smallest component of a membrane
unit in which a specific membrane surface area is housed in a device
with a filtrate outlet structure.
(52) Membrane sensitivity--The maximum log removal
value that can be reliably verified by a direct integrity test.
(53) Membrane unit--A group of membrane modules that
share common valving, which allows the unit to be isolated from the
rest of the system for the purpose of integrity testing or other maintenance.
(54) Milligrams per liter (mg/L)--A measure of concentration,
equivalent to and replacing parts per million in the case of dilute
solutions.
(55) Monthly reports of water works operations--The
daily record of data relating to the operation of the system facilities
compiled in a monthly report.
(56) National Fire Protection Association (NFPA) standards--The
standards of the NFPA.
(57) NSF International--The organization and the standards,
certifications, and listings developed by NSF International (formerly
known as the National Sanitation Foundation) related to drinking water.
(58) Noncommunity water system--Any public water system
which is not a community system.
(59) Nonhealth hazard--A cross-connection, potential
contamination hazard, or other situation involving any substance that
generally will not be a health hazard, but will constitute a nuisance,
or be aesthetically objectionable, if introduced into the public water
supply.
(60) Nontransient, noncommunity water system--A public
water system that is not a community water system and regularly serves
at least 25 of the same persons at least six months out of the year.
(61) Pass--In reference to a reverse osmosis or nanofiltration
membrane system, stages of pressure vessels in series in which the
permeate from one stage is further processed in a following stage.
(62) Peak hourly demand--In the absence of verified
historical data, peak hourly demand means 1.25 times the maximum daily
demand (prorated to an hourly rate) if a public water supply meets
the commission's minimum requirements for elevated storage capacity
and 1.85 times the maximum daily demand (prorated to an hourly rate)
if the system uses pressure tanks or fails to meet the commission's
minimum elevated storage capacity requirement.
Cont'd... |
