(a) The IDSE report must include the recommendations and justification for where and during what month(s) TTHM and HAA5 monitoring for R309-210-10 of this part should be conducted. The water system must base the recommendations on the criteria in paragraphs (b) through (e) of this section.(b) The water system must select the number of monitoring locations specified in this paragraph (b). The water system will use these recommended locations as R309-210-10 routine compliance monitoring locations, unless Director requires different or additional locations. The water system should distribute locations throughout the distribution system to the extent possible.
(i) Surface water systems serving less than 500.
(A) One monitoring period per year. Two dual samples sets must be collected per monitoring period.
(B) One dual sample set must be taken at the high TTHM location in the distribution system.
(C) One dual sample set must be taken at the high HAA5 location in the distribution system.
(ii) Surface water systems serving between 500 to 3,300.
(A) Four monitoring periods per year, dual sample sets must be taken every 90 days. Two dual samples sets must be collected per monitoring period.
(B) One dual sample set must be taken at the high TTHM location in the distribution system.
(C) One dual sample set must be taken at the high HAA5 location in the distribution system.
(iii) Surface water systems serving between 3,301 to 9,999 population.
(A) Four monitoring periods per year, dual sample sets must be taken every 90 days. Two dual samples sets must be collected per monitoring period.
(B) One dual sample set must be taken at the high TTHM locations in the distribution system.
(C) One dual sample set must be taken at the high HAA5 location in the distribution system.
(iv) Surface water systems serving between 10,000 to 49,999 population.
(A) Four monitoring periods per year, dual sample sets must be taken every 90 days. Four dual samples sets must be collected per monitoring period.
(B) Two dual sample sets must be taken at the high TTHM locations in the distribution system.
(C) One dual sample set must be taken at the high HAA5 locations in the distribution system.
(D) One dual sample set must be taken at an existing R309-210-8 compliance location.
(v) Surface water systems serving between 50,000 to 249,999 population.
(A) Four monitoring periods per year, dual sample sets must be taken every 90 days. Eight dual samples sets must be collected per monitoring period.
(B) Three dual sample sets must be taken at the high TTHM locations in the distribution system.
(C) Three dual sample sets must be taken at the high HAA5 locations in the distribution system.
(D) Two dual samples sets must be taken at an existing R309-210-8 compliance location.
(vi) Surface water systems serving between 250,000 to 999,999 population.
(A) Four monitoring periods per year, dual sample sets must be taken every 90 days. 12 dual samples sets must be collected per monitoring period.
(B) Five dual sample sets must be taken at the high TTHM locations in the distribution system.
(C) Four dual sample sets must be taken at the high HAA5 locations in the distribution system.
(D) Three dual sample sets must be taken at an existing R309-210-8 compliance location.
(vii) Surface water systems serving between 1,000,000 to 4,999,999 population.
(A) Four monitoring periods per year, dual sample sets must be taken every 90 days. 16 dual samples sets must be collected per monitoring period.
(B) Six dual sample sets must be taken at the high TTHM locations in the distribution system.
(C) Six dual sample sets must be taken at the high HAA5 locations in the distribution system.
(D) Four dual sample sets must be taken at an existing R309-210-8 compliance location.
(viii) Surface water systems serving 5,000,000 or more population.
(A) Four monitoring periods per year, dual sample sets must be taken every 90 days. 20 dual samples sets must be collected per monitoring period.
(B) Eight dual sample sets must be taken at the high TTHM locations in the distribution system.
(C) Seven dual sample sets must be taken at the high HAA5 locations in the distribution system.
(D) Five dual sample sets must be taken at an existing R309-210-8 compliance location.
(ix) Ground water systems serving less than 500.
(A) One monitoring period per year. Two dual samples sets must be collected per monitoring period.
(B) One dual sample set must be taken at the high TTHM location in the distribution system.
(C) One dual sample set must be taken at the high HAA5 location in the distribution system.
(x) Ground water systems serving between 500 to 9,999 population.
(A) One monitoring period per year. Two dual samples sets must be collected per monitoring period.
(B) One dual sample set must be taken at the high TTHM location in the distribution system.
(C) One dual sample set must be taken at the high HAA5 location in the distribution system.
(xi) Ground water systems serving between 10,000 to 99,999 population.
(A) Four monitoring periods per year, dual sample sets must be taken every 90 days. Four dual samples sets must be collected per monitoring period.
