N.H. Code Admin. R. Env-Ws 380.02
(a) "Backwash" means the process of reversing the flow of water back through the filter media to remove entrapped solids.
(b) "Coagulation" means a process using coagulant chemicals and mixing by which colloidal and suspended materials are agglomerated into flocs.
(c) "Comprehensive performance evaluation" means a thorough review and analysis of a treatment plant's performance-based capabilities and associated administrative, operation and maintenance practices to identify factors that might be adversely impacting a plant's capability to achieve compliance and which emphasizes approaches that can be implemented without significant capital improvements.
(d) "Conventional filtration" means a series of processes including coagulation, flocculation, sedimentation, and filtration resulting in particulate removal.
(e) "Cryptosporidium" means a microorganism found in raw water which may cause illness after ingestion.
(f) "Diatomaceous earth filtration" means a process resulting in particulate removal in which a precoat cake of diatomaceous earth filter media is deposited on a support membrane, and while the water is filtered by passing through the cake on the support membrane, additional filter media is continuously added to the feed water to maintain the permeability of the filter cake.
(g) "Direct filtration" means a series of processes including coagulation and filtration but excluding sedimentation resulting in particulate removal.
(h) "Disinfectant" means any oxidant, including but not limited to chlorine, chlorine dioxide, chloramines, and ozone, added to water in any part of the treatment or distribution process, that is intended to kill or inactivate pathogenic microorganisms.
(i) "Disinfectant contact time" or T in CT calculations means the time in minutes that it takes for water to move from the point of disinfectant application or the previous point of disinfectant residual measurement to a point before or at the point where residual disinfectant concentration is measured.
(j) "Disinfection" means a process which inactivates pathogenic organisms in water usingchemical oxidants or equivalent agents.
(k) "Disinfection profile" means a summary of daily giardia lamblia inactivation through the treatment plant.
(l) "Disinfection sequence" means that segment of a water supply main between point of disinfectant application and the first customer or subsequent point of disinfectant application.
(m) "Filter profile" means a graphic representation of individual filter performance, based on continuous turbidity measurements or total particle counts 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.
(n) "Filtration" means a process for removing particulate matter from water by passage through porous media.
(o) "Flocculation" means a process to enhance agglomeration or collection of smaller floc particles into larger, more easily settleable particles through gentle stirring by hydraulic or mechanical means.
(p) "Giardia lamblia" means a microorganism found in raw water which can cause illness after ingestion.
(q) "Ground-water under the direct influence of surface water" means "ground water under the direct influence of surface water" as defined in 40 CFR 141.2, namely "any water beneath the surface of the ground with significant occurrence of insects or other microorganisms, algae, or large-diameter pathogens such as giardia lamblia or cryptosporidium or significant and relatively rapid shifts in water characteristics such as turbidity, temperature, conductivity, or pH which closely correlate to climatological or surface water conditions."
(r) "High turbidity event" means a series of consecutive days during which at least one turbidity measurement each day exceeds 5 NTU.
(s) "Inactivation" is the process by which a microorganism is altered so that the microorganism is unable to replicate.
(t) "Inactivation ratio" means the ratio of Ctcalc to CT99.9, Ctcalc/CT99.9.
(u) "Legionella" means a genus of bacteria, some species of which have caused a type of pneumonia called legionnaires disease.
(v) "Owner" means the person in possession of or having legal ownership of a public water system.
(w) "Point of disinfectant application" is the point where the disinfectant is applied and water downstream of that point is not subject to recontamination by surface water runoff.
(x) "Residual disinfectant concentration", or C in CT calculations, means the concentration of disinfectant measured in mg/l in a representative sample of water.
(y) "Sedimentation" means a process for removal of solids before filtration by gravity or separation.
(z) "Slow sand filtration" means a process involving passage of raw water through a bed of sand at low velocity resulting in particulate removal by physical and biological mechanisms.
(aa) "Surface water" means all water which is open to the atmosphere and subject to surface runoff.
(ab) "Surface water/ground water under the direct influence of surface water" system means a public water system using surface water or ground water under the direct influence of surface water as a source that is subject to the requirements of Env-Ws 380.
(ac) "Total inactivation ratio" means the sum of the inactivation ratios, represented by [SIGMA](Ctcalc/CT99.9), calculated by adding together the inactivation ratio for each disinfection sequence in the case of a public water system which applies disinfectants at more than one point prior to the first customer.
(ad) "Uncovered finished water storage facility" means a tank, reservoir, or other facility used to store water that will undergo no further treatment except residual disinfection and is open to the atmosphere.
(ae) "Unusual and unpredictable" means markedly contrasting with historical records, not indicative of generally predominating conditions, and not directly controllable by the water system operator.
(af) "Virus" means a group of infectious agents ranging from 10-250 nanometers in diameter, composed of a protein sheath surrounding a nucleic acid core and capable of infecting all animals, plants, and bacteria and characterized by total dependence on living cells for reproduction and by a lack of independent metabolism.
(ag) "Waste recycling" means the return of spent filter backwash water, thickener supernatant, and liquids from treatment solids dewatering processes to the core process for treatment.
(ah) "Waterborne disease outbreak" means the occurrence of acute infectious illness epidemiologically associated with the ingestion of water from a public water system which is deficient in treatment.
N.H. Code Admin. R. Env-Ws 380.02
(See Revision Note at chapter heading for Env-Ws 300) #6521, eff 6-4-97; amd by #7754, eff 8-21-02; ss by #8352, eff 5-14-05