N.H. Admin. Code § Env-Ws 373.21

Current through Register No. 50, December 12, 2024

Section Env-Ws 373.21 - Technical Design Proposal Criteria

The technical design proposal required by Env-Ws 373.20(b)(4) shall:

(a) Identify the water treatment process to be used and the equipment to be installed;

(b) Describe the chemical(s), plumbing, and electrical control modifications that represent a complete treatment process;

(c) Include a tabular summary of laboratory sampling results analyzed by a New Hampshire accredited laboratory which identifies:

(1) The contaminant(s) to be modified by the treatment process; and

(2) All other water quality factors, by name and concentration, that are predicted to be modified by the treatment process;

(d) Describe the expected water quality change by the water treatment process, including:

(1) The concentration of the target contaminant at normal and peak production rates; and

(2) The concentrations of all other affected water quality parameters at normal and peak production rates;

(e) Identify the configuration of all components of the treatment process including:

(1) The rationale for a series or parallel configuration;

(2) The number of trains of equipment; and

(3) A description of each pretreatment process;

(f) Describe the design goal of the treatment process, as follows:

(1) Removal of the contaminant(s) to de minimis levels; or

(2) A reduction of the contaminant so as to achieve compliance with the maximum contaminant level(s) or the maximum contaminant level goals specified in Env-Ws 312 through Env-Ws 316;

(g) Identify the criteria used for each treatment component of the process, as appropriate, including:

(1) The loading rate;

(2) The detention time or empty bed contact time;

(3) The backwash or regeneration flow rate required; and

(4) The concentration of target contaminant selected to control the end of the treatment cycle;

(h) Require a sampling tap to be installedbetween each treatment component of the treatment process and identify plumbing appurtenances throughout the treatment sequence, including:

(1) Connecting pipe size, gate valves, check valves, unions, and bypasses;

(2) Meter(s) and their type including whether indicating, totalizing or recording; and

(3) Flow restrictors and their rating;

(i) Identify measuring, control, and communication/alarm equipment including:

(1) Chemical feed pump pacing method and associated equipment;

(2) Flow switch interrupt of chemical feed equipment when there is no production flow; and

(3) Other automatic monitoring and communication devices;

(j) For each treatment chemical to be used:

(1) Identify the chemical and the anticipated concentration(s) to be used during both the initial start-up phase and the operational phase, if different; and

(2) Include the following information:

a. Documentation that the chemical is approved for drinking water use in accordance with American National Standards Institute (ANSI) standard 60 as required in Env-Ws 305; and

b. A copy of the material safety data sheet (MSDS) for that chemical.

N.H. Admin. Code § Env-Ws 373.21

(See Revision Note at chapter heading for Env-Ws 300); ss by #8499, eff 11-30-05