Section Env-Ws 381.15 - Location of Lead and Copper Sampling Sites(a) By the applicable date for commencement of monitoring specified in paragraph Env-Ws 381.18(a) and (b), each water system owner shall complete a materials evaluation of its distribution system in order to identify a pool of targeted sampling sites that meets the requirements of this section and which is sufficiently large to ensure that the water system can collect the number of lead and copper tap samples required in Env-Ws 381.17. Each site from which first draw samples are collected shall be selected from this pool of targeted sampling sites. Sampling sites shall not include faucets that have point-of-use or point-of-entry treatment devices designed to remove inorganic contaminants.(b) A water system owner shall use the information on lead, copper, and galvanized steel that it is required to collect under 40 CFR 141.42(d) when conducting a materials evaluation.(c) When an evaluation of the information collected pursuant to 40 CFR 141.42(d) is insufficient to locate the requisite number of lead and copper sampling sites that meet the targeting criteria in (a), the water system owner shall review the sources of information listed below in order to identify a sufficient number of sampling sites.(d) A water system owner, in the course of conducting routine system operations, including, but not limited to performing maintenance activities or checking service line materials, shall collect the following where applicable:(1) All plumbing codes, permits, and records in the files of the building department(s) which indicate the plumbing materials that are installed within publicly and privately owned structures connected to the distribution system;(2) All inspections and records of the distribution system that indicate the material composition of the service connections that connect a structure to the distribution system; and(3) All existing water quality information, which includes the results of all prior analyses of the system or individual structures connected to the system, indicating locations that may be particularly susceptible to high lead or copper concentrations.(e) The sampling sites selected for a community water system's sampling pool, known as tier 1 sampling sites, shall consist of single family structures that: (1) Contain copper pipes with lead solder installed after 1982;(3) Are served by a lead service line; or(4) Contain any combination of (1), (2), and (3) above.(f) When multiple-family residences comprise at least 20% of the structures served by a water system, the system owner may include multiple family residences in (e) above, in its sampling pool.(g) The owner of a community water system with insufficient tier 1 sampling sites shall complete its sampling pool with sites consisting of buildings, including multiple-family residences known as tier 2 sampling sites that: (1) Contain copper pipes with lead solder installed after 1982;(3) Are served by a lead service line; or(4) Contain any combination of (1), (2), and (3) above.(h) The owner of a community water system with insufficient tier 1 and tier 2 sampling sites shall complete its sampling pool with sites consisting of single family structures that contain copper pipes with lead solder installed before 1983, known as tier 3 sampling sites.(i) The owner of a community water system with insufficient tier 1, tier 2, and tier 3 sampling sites shall complete its sampling pool with representative sites throughout the distribution system. For the purpose of this paragraph, a representative site is a site in which the plumbing materials used at that site would be commonly found at other sites served by the water system.(j) The sampling sites selected for a non-transient non-community water system, known as tier 1 sampling sites shall consist of buildings that:(1) Contain copper pipes with lead solder installed after 1982;(3) Are served by a lead service line; or(4) Contain any combination of (1), (2), and (3) above.(k) The owner of a non-transient non-community water system with insufficient tier 1 sites that meet the targeting criteria in (j) above shall complete its sampling pool with sampling sites that contain copper pipes with lead solder installed before 1983.(l) If additional sites in (k) above, are needed to complete the sampling pool, the non-transient non-community water system owner shall use representative sites throughout the distribution system. For the purpose of this paragraph, a representative site is a site in which the plumbing materials used at that site would be commonly found at other sites served by the water system.(m) The owner of a water system whose distribution system contains lead service lines shall draw 50% of the samples collected during each monitoring period from sites that contain lead pipes, or copper pipes with lead solder, and 50% of the samples from sites served by a lead service line.(n) A water system owner in (m) above, that cannot identify a sufficient number of sampling sites served by a lead service line shall collect first-draw samples from all of the sites identified as being served by such lines.N.H. Code Admin. R. Env-Ws 381.15
(See Revision Note at chapter heading for Env-Ws 300) #6521, eff 6-4-97, ss by #7734, eff 8-2-02