| (47) 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.
(48) 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.
(49) 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.
(50) Membrane sensitivity--The maximum log removal
value that can be reliably verified by a direct integrity test.
(51) 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.
(52) Milligrams per liter (mg/L)--A measure of concentration,
equivalent to and replacing parts per million in the case of dilute
solutions.
(53) Monthly reports of water works operations--The
daily record of data relating to the operation of the system facilities
compiled in a monthly report.
(54) National Fire Protection Association (NFPA) standards--The
standards of the NFPA.
(55) 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.
(56) Noncommunity water system--Any public water system
which is not a community system.
(57) 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.
(58) 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.
(59) 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.
(60) 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.
(61) Plumbing inspector--Any person employed by a political
subdivision for the purpose of inspecting plumbing work and installations
in connection with health and safety laws and ordinances, who has
no financial or advisory interest in any plumbing company, and who
has successfully fulfilled the examinations and requirements of the
Texas State Board of Plumbing Examiners.
(62) Plumbing ordinance--A set of rules governing plumbing
practices which is at least as stringent and comprehensive as one
of the following nationally recognized codes:
(A) the International Plumbing Code; or
(B) the Uniform Plumbing Code.
(63) Potable water customer service line--The sections
of potable water pipe between the customer's meter and the customer's
point of use.
(64) Potable water main--A pipe or enclosed constructed
conveyance operated by a public water system which is used for the
transmission or distribution of drinking water to a potable water
service line.
(65) Potable water service line--The section of pipe
between the potable water main and the customer's side of the water
meter. In cases where no customer water meter exists, it is the section
of pipe that is under the ownership and control of the public water
system.
(66) Potential contamination hazard--A condition which,
by its location, piping or configuration, has a reasonable probability
of being used incorrectly, through carelessness, ignorance, or negligence,
to create or cause to be created a backflow condition by which contamination
can be introduced into the water supply. Examples of potential contamination
hazards are:
(A) bypass arrangements;
(B) jumper connections;
(C) removable sections or spools; and
(D) swivel or changeover assemblies.
(67) Process control duties--Activities that directly
affect the potability of public drinking water, including: making
decisions regarding the day-to-day operations and maintenance of public
water system production and distribution; maintaining system pressures;
determining the adequacy of disinfection and disinfection procedures;
taking routine microbiological samples; taking chlorine residuals
and microbiological samples after repairs or installation of lines
or appurtenances; and operating chemical feed systems, filtration,
disinfection, or pressure maintenance equipment; or performing other
duties approved by the executive director.
(68) psi--Pounds per square inch.
(69) Public drinking water program--Agency staff designated
by the executive director to administer the Safe Drinking Water Act
and state statutes related to the regulation of public drinking water.
Any report required to be submitted in this chapter to the executive
director must be submitted to the Texas Commission on Environmental
Quality, Water Supply Division, MC 155, P.O. Box 13087, Austin, Texas
78711-3087.
(70) Public health engineering practices--Requirements
in this chapter or guidelines promulgated by the executive director.
(71) Public water system--A system for the provision
to the public of water for human consumption through pipes or other
constructed conveyances, which includes all uses described under the
definition for drinking water. Such a system must have at least 15
service connections or serve at least 25 individuals at least 60 days
out of the year. This term includes: any collection, treatment, storage,
and distribution facilities under the control of the operator of such
system and used primarily in connection with such system, and any
collection or pretreatment storage facilities not under such control
which are used primarily in connection with such system. Two or more
systems with each having a potential to serve less than 15 connections
or less than 25 individuals but owned by the same person, firm, or
corporation and located on adjacent land will be considered a public
water system when the total potential service connections in the combined
systems are 15 or greater or if the total number of individuals served
by the combined systems total 25 or greater at least 60 days out of
the year. Without excluding other meanings of the terms "individual"
or "served," an individual shall be deemed to be served by a water
system if he lives in, uses as his place of employment, or works in
a place to which drinking water is supplied from the system.
(72) Quality Control Release Value (QCRV)--A minimum
quality standard of a non-destructive performance test established
by the manufacturer for membrane module production that ensures that
the module will attain the targeted log removal value demonstrated
during challenge testing.
(73) Reactor Validation Testing--A process by which
a full-scale ultraviolet (UV) reactor's disinfection performance is
determined relative to operating parameters that can be monitored.
These parameters include flow rate, UV intensity as measured by a
UV sensor and the UV lamp status.
(74) Resolution--The size of the smallest integrity
breach that contributes to a response from a direct integrity test
in membranes used to treat surface water or groundwater under the
direct influence of surface water.
(75) Sanitary control easement--A legally binding document
securing all land, within 150 feet of a public water supply well location,
from pollution hazards. This document must fully describe the location
of the well and surrounding lands and must be filed in the county
records to be legally binding. For an example, see commission Form
20698.
Cont'd... |
