N.H. Admin. Code § Env-Ws 381.02
(a) "Action levels" means the concentration of lead or copper in water specified in Env-Ws 381.03 which determines, in some cases, the treatment requirement contained in this part.
(b) "Acidification" means the addition of an acid to a water sample for the purpose of increasing the laboratory holding time.
(c) "Community water system" means "community water system" as defined in RSA 485:1-a,I, namely "a public water system which serves at least 15 service connections used by year-round residents or regularly serves at least 25 year-round residents."
(d) "Composite sample" means a collection of individual samples combined into one representative sample analyzed to determine the average conditions during a sampling period.
(e) "Corrosion inhibitor" means a substance capable of reducing the corrosivity of the water towards metal plumbing materials, including lead and copper, by forming a protective film on the interior surface of those materials.
(f) "Department" means the department of environmental services.
(g) "Effective control inhibitor residual" means a concentration sufficient to form a protective film on the interior walls of a pipe.
(h) "Excursion" means an occurrence whenever the daily value for one or more of the water quality parameters measured at a sampling location is below the minimum value or outside the range of values specified by the department.
(i) "First draw sample" means a one liter sample of tap water, collected in accordance with Env-Ws 381.16(b), that has been standing in the plumbing at least 6 hours but no longer than 10 hours and is collected without flushing the tap.
(j) "Large water system" means a water system that services more than 50,000 persons.
(k) "Lead service line" means a service line made of lead which connects the water main to the building inlet and any pigtail, gooseneck, or other fitting that is connected to such lead service line.
(l) "Medium sized system" means a water system that serves greater than 3,300 and less than or equal to 50,000 persons.
(m) "Metal coupon test" means a method used to evaluate the effectiveness of corrosion control treatment by placing a specimen into the water to measure the corrosiveness of the water. The rate of corrosion is measured by the loss of weight of the specimen between weighing time intervals.
(n) "Non-transient non-community water system" means "non-transient non-community water system" as defined in RSA 485:1-a,XI, namely "a system which is not a community water system and which regularly serves the same 25 people, or more, over 6 months per year."
(o) "Optimal corrosion control treatment" means the corrosion control treatment that minimizes the lead and copper concentrations at users' taps while insuring that the treatment does not cause a water system violation of the national primary drinking water rules.
(p) "Partial-system test" means a method used to evaluate the effectiveness of corrosion control treatment by measuring the rate of corrosion on an isolated portion of the distribution system with treatment as compared to other portions of the distribution system without treatment.
(q) "Pipe rig/loop test" means a method used to evaluate the effectiveness of corrosion control treatment by constructing a working model of a distribution system out of the same material as the actual distribution system and measuring the corrosiveness of the water in the model.
(r) "Practical quantitation limit" (PQL) means the lowest acceptable laboratory instrument calibration standard used to analyze a water sample.
(s) "Service line sample" means a one liter sample of water, collected in accordance with Env-Ws 381.16(g) and (h) that has been standing for at least 6 hours in a service line but no longer than 10 hours.
(t) "Single family structure" means a building constructed as a single family residence that is currently used as either a residence or a place of business.
(u) "Small water system" means a water system that serves 3,300 persons or fewer.
(v) "Treatment technique requirement" means "treatment technique requirement" as defined in Env-Ws 302.01.
N.H. Admin. Code § Env-Ws 381.02
(See Revision Note at chapter heading for Env-Ws 300) #6521, eff 6-4-97, ss by #7734, eff 8-2-02