New Hampshire Code of Administrative Rules
Env - Department of Environmental Services
Subtitle Env-Ws - Division of Water
Chapter Env-Ws 300 - NEW HAMPSHIRE DRINKING WATER RULES
Part Env-Ws 382 - DISINFECTANT/DISINFECTION BYPRODUCTS RULE
Section Env-Ws 382.23 - Enhanced Coagulation and Enhanced Softening Step 1 Performance Requirements

(a) A system owner shall achieve the percent reduction of TOC specified in Table 382-3:

Table 382-3

(b) The Step 1 TOC reductions specified in (a), above shall be:

(c) A system owner unable to comply with Step 1 TOC reductions in (b)(1), above, may submit to the department a written request for approval of the alternative Step 2 TOC reduction specified in (f) below.

(d) The written request shall include the following information:

(e) The department shall approve the request if the bench or pilot test study concludes that the system is unable to meet Step 1 TOC removal requirements.

(f) A system owner practicing softening shall meet the step 1 TOC reductions in the Source Water Alkalinity Greater than 120 mg/L column of Table 382-3 for the specified source water TOC.

(g) A system owner meeting at least one of the conditions specified in Env-Ws 382.22(b) shall not be required to operate with enhanced coagulation.

(h) A softening system meeting one of the alternative compliance criteria in Env-Ws 382.22(f) shall not be required to operate with enhanced softening.

(i) The owner of a SW/GWUDISW system owner using conventional treatment that cannot achieve the Step 1 TOC removals required by (a) above, due to water quality parameters or operational constraints, shall submit a written request to the department, within 3 months of the failure to achieve the TOC removals, for approval by the department of alternative minimum TOC, Step 2, removal requirements.

(j) The request shall include the items specified in Env-Ws 382.24(b).

(k) The department shall approve the request if the bench or pilot test study concludes that the system is unable to meet Step 1 TOC removal requirements.

(l) If the department approves the alternative minimum TOC removal, Step 2, requirements, the department shall make those requirements retroactive for the purposes of determining compliance provided the requirements of Env-Ws 382.20(b) and (c) are met. Until the department approves the alternate minimum TOC removal, step 2, requirements, the system shall meet the step 1 TOC removal requirements contained in (a) above.