La. Admin. Code tit. 51 § XII-1103
Approved Surface Water-a surface water or GWUDISW that has received permit approval from the DHH as a source of water supply for a public water system.
Best Available Technology-for the purpose of this Chapter in relation to the treatment of surface water, means conventional filtration treatment which conforms with all of the requirements of this Chapter.
Calibrationdra-to standardize [adjust the instrument response to a National Institute of Standards and Technology (NIST) traceable standard] a disinfectant residual analyzer (such as, but not limited to, a bench top or a continuous monitoring disinfectant residual analyzer using colorimetry or spectrophotometry) by determining the deviation from a NIST traceable standard so as to ascertain and implement the proper correction factors in an attempt to obtain accurate and reliable sample results.
CalibrationpH-to standardize (adjust the instrument response to a pH primary standard) a pH meter (such as a bench top or continuous monitoring pH meter) by determining the deviation from a pH primary standard so as to ascertain and implement the proper correction factors in an attempt to obtain accurate and reliable results.
Calibrationt-to standardize (adjust the instrument response to a turbidity primary standard) a turbidimeter (such as a bench top or continuous monitoring turbidimeter)by determining the deviation from a turbidity primary standard so as to ascertain and implement the proper correction factors in an attempt to obtain accurate and reliable sample results.
Calibrationtemp-to standardize [adjust the instrument response to a NIST traceable standard] a temperature measuring device (such as a thermometer or thermocouple) by determining the deviation from a NIST traceable standard so as to ascertain and implement the proper correction factors in an attempt to obtain accurate and reliable sample results.
Certified Operator-for the purpose of this Chapter, the individual, as examined by the committee of certification and as approved by the state health officer, meeting all requirements of state law and regulation and found competent to operate a treatment plant for a public water system which utilizes surface water or GWUDISW as its source of water supply.
Coagulation-a process using coagulant chemicals and rapid mixing by which colloidal and suspended material are destabilized and agglomerated into settleable and/or filterable flocs.
Comprehensive Performance Evaluation (CPE)-a thorough review and analysis of a treatment plant's performance-based capabilities and associated administrative, operation, and maintenance practices. It is conducted to identify factors that may be adversely impacting a plant's capability to achieve compliance and emphasizes approaches that can be implemented without significant capital improvements. It consists of at least the following components: assessment of plant performance; evaluation of major unit processes; identification and prioritization of performance limiting factors; assessment of the applicability of comprehensive technical assistance; and, preparation of a CPE report.
Conventional Filtration Treatment-a series of treatment processes which includes coagulation, flocculation, sedimentation, and filtration resulting in substantial particulate removal.
Deep Bed Filtration-a process for removing particulate matter from water by passage through porous media exceeding 42 inches in total depth. Underdrain gravels are not to be included.
Diatomaceous Earth Filtration-a process resulting in particulate removal in which a precoat cake of graded diatomaceous earth filter media is deposited on a support membrane (septum) and, while the water is being filtered by passing through the cake on the septum, additional filter media known as body feed is continuously added to the feed water to maintain the permeability of the filter cake.
Direct Filtration Treatment-a series of processes including coagulation, flocculation, and filtration but excluding sedimentation.
Disinfectant Contact Time ("T" in CT calculations)-the time in minutes that it takes for water to move from the point of disinfectant application or a previous point of disinfectant residual measurement to a point before or at the point where residual disinfectant concentration is measured. The point of measurement shall be before or at the first customer. Disinfectant contact time in pipelines is calculated by dividing the internal volume of the pipe by the flow rate through the pipe. Disinfectant contact time with mixing basins and storage reservoirs is determined by tracer studies or an equivalent demonstration to the DHH.
Disinfection-a process which inactivates pathogenic organisms in water by chemical oxidants or equivalent agents.
Disinfection Profile-a summary of Giardia lamblia inactivation through the treatment plant. For any system that uses chloramines, ozone, or chlorine dioxide for primary disinfection, this term shall additionally include a summary of virus inactivation through the treatment plant.
Engineering Report-a water treatment technical report prepared by a qualified engineer.
Filter Profile-a graphical representation of individual filter performance, based on continuous turbidity measurements versus time for an entire filter run, from startup to backwash inclusively, that includes an assessment of filter performance while another filter is being backwashed.
Filtration-a process for removing particulate matter from water by passage through porous media.
Flocculation-a process to enhance agglomeration or collection of smaller floc particles into larger, more easily settleable or filterable particles through gentle stirring by hydraulic or mechanical means.
Groundwater under the Direct Influence of Surface Water (GWUDISW)-any water beneath the surface of the ground with significant occurrence of insects or other macroorganisms, algae, or large diameter pathogens such as Giardia lamblia or Cryptosporidium, or significant and relatively rapid shifts in site specific water characteristics such as turbidity, temperature, conductivity or pH which closely correlate to climatological or surface water conditions. The DHH determination of direct influence may be based on an evaluation of site-specific measurements of water quality and/or documentation of well construction characteristics and geology with field evaluation.
Heterotrophic Plate Count (HPC)-laboratory analytical procedure for estimating the number of live heterotrophic bacteria in water using instrumentation and methods as described in Standard Methods for the Examination of Water and Wastewater, 19th Edition. Results of such analysis is reported as "colony-forming units per milliliter" (cfu/ml).
IESWTR-Interim Enhanced Surface Water Treatment Rule.
Legionella-a genus of bacteria, some species of which have caused a type of pneumonia called Legionnaires disease.
Liquids from Dewatering Processes-a stream containing liquids generated from a unit used to concentrate solids for disposal.
LT1ESWTR-Long Term 1 Enhanced Surface Water Treatment Rule.
LT2ESWTR-Long Term 2 Enhanced Surface Water Treatment Rule.
Multibarrier Treatment-a series of water treatment processes that provide for both removal and inactivation of waterborne pathogens.
Nephelometric Turbidity Unit (NTU)-a measurement of the turbidity of water as determined by the comparison of the intensity of light scattered by the sample to the intensity of incident light, using instrumentation and methods described in §1105. B of this Chapter.
Peak Hourly Flow-the maximum flow through a particular disinfection segment over a one hour period during 24 hourly periods in a calendar day.
Pressure Filter-a pressurized vessel containing properly sized and graded granular media.
Primary Standard (Turbidity)-turbidity primary standard.
Qualified Engineer-any engineer who has been registered under the provisions of R.S. 37:681 et seq., and who holds a current certificate issued by the Louisiana Professional Engineering and Land Surveying Board, and who has knowledge and experience in water treatment plant design, construction, operation, and watershed evaluations.
Residual Disinfectant Concentration ("C" in CT calculations)-the concentration of the disinfectant in milligrams per liter (mg/l) in a representative sample of water.
Sedimentation-a process for removal of settleable solids before filtration by gravity or separation.
Slow Sand Filtration-a process involving passage of raw water through a bed of sand at low velocity (less than 0.10 gallons per minute per square foot) resulting in substantial particulate removal by physical and biological mechanisms.
Spent Filter Backwash Water-a stream containing particles that are dislodged from filter media when water is forced back through the filter (backwashed) to clean the filter.
Supplier-for the purpose of this Chapter, means the owner or operator of a public water system.
Surface Water-all water open to the atmosphere and subject to surface runoff.
SWTR-Surface Water Treatment Rule.
SWTR Guidance Manual-U.S. EPA's Guidance Manual for Compliance with the Filtration and Disinfection Requirements for Public Water Systems using Surface Water Sources, March 1991 Edition.
Thickener Supernatant-a stream containing the decant from a sedimentation basin, clarifier or other unit that is used to treat water, solids, or semi-solids from the primary treatment processes.
Turbidity-a measure of the decline of the clarity of water caused by suspended and colloidal matter, such as clay, silt, finely divided organic and inorganic matter, plankton, and other microscopic organisms. It is formally expressed as the optical property that causes light to be scattered and absorbed, rather than transmitted with no change in direction through the sample.
Turbidity Level-the value in NTU obtained by measuring the turbidity of a representative grab sample of water at a specified regular interval of time. If continuous turbidity monitoring is utilized, the turbidity level is the discrete turbidity value at any given time.
Turbidity Primary Standard-a suspension used to calibrate a turbidimeter, such as user-prepared formazin, commercial stock formazin suspensions, or commercial styrene-divinylbenzene suspensions. Such suspensions shall be prepared and used in conformity with the laboratory methods described in §1105. B of this Chapter.
Validation-to determine the degree of deviation of a measuring instrument (such as a bench top or continuous monitoring turbidimeter) from a primary standard by employing less sophisticated or involved means typically employed during a calibration, such as use of a state-approved secondary standard.
Virus-any of a large group of submicroscopic agents (that consist of a RNA or DNA core of genetic material surrounded by a protein coat but no semipermeable membrane) that are capable of growth and multiplication only in living cells and that are infectious to humans by waterborne transmission and that cause various important diseases in humans, including, but not limited to, poliomyelitis, aseptic meningitis, infectious hepatitis, gastroenteritis, etc.
La. Admin. Code tit. 51, § XII-1103