1. (a) Each system that installs CCT shall monitor the following WQPs, pursuant to section 64680 (General WQP Monitoring Requirements), as applicable:

   1. (1) At taps:

      1. (A) pH;
      2. (B) Alkalinity;
      3. (C) Orthophosphate, when an inhibitor containing a phosphate compound is used;
      4. (D) Silica, when an inhibitor containing a silicate compound is used;
      5. (E) Calcium, when calcium carbonate stabilization is used as part of corrosion control.

   2. (2) At each entry point to the distribution system every two weeks as a minimum:

      1. (A) pH;
      2. (B) When alkalinity is adjusted as part of CCT, a reading of the dosage rate of the chemical used to adjust alkalinity, and the alkalinity concentration; and
      3. (C) When a corrosion inhibitor is used as part of CCT, a reading of the dosage rate of the inhibitor used, and the concentration of the active ingredient(s).

2. (b) A ground water system may use entry points that are representative of water quality and treatment conditions throughout the system for the monitoring required in paragraph (a)(2) as follows:

   1. (1) If waters from untreated and treated groundwater sources mix, the system shall monitor entry points representative of each;
   2. (2) Prior to monitoring, the system shall submit written documentation to the Department identifying the sites and demonstrating that they are representative.

3. (c) Subject to the Department's written approval, a system that has no action level exceedance and meets the Department-specified WQP values or ranges may reduce tap monitoring as follows:

   1. (1) After two consecutive periods during which it has met the WQP values or ranges, the system shall monitor each period at the reduced number of sites, pursuant to table 64680-A;
   2. (2) After three consecutive years (including the initial sampling year) during which it has met the WQP values or ranges, the system shall monitor annually at the reduced number of sites at evenly-spaced intervals throughout the year; and
   3. (3) After three consecutive years of annual monitoring during which the system meets the WQP values or ranges, the system shall monitor once every three years at the reduced number of sites at evenly-spaced intervals throughout the monitoring year.

Note: Authority cited: Sections 100275, 116350, 116365, 116375 and 116385, Health and Safety Code. Reference: Sections 116325-116750, Health and Safety Code.

History

1. New article 6 and section filed 12-11-95 as an emergency; operative 12-11-95 (Register 95, No. 50). A Certificate of Compliance must be transmitted to OAL by 4-9-96 or emergency language will be repealed by operation of law on the following day.

2. Refiling of 12-11-95 order, including amendment of Note, filed 4-9-96 as an emergency; operative 4-10-96 (Register 96, No. 15). A Certificate of Compliance must be transmitted to OAL by 8-8-96 or emergency language will be repealed by operation of law on the following day.

3. Editorial correction of subsection (b) (Register 96, No. 38).

4. Certificate of Compliance as to 12-11-95 order, including amendment of subsection (i), transmitted to OAL 8-7-96 and filed 9-16-96 (Register 96, No. 38).

5. Repealer of article 6 (sections 64682-64685) and repealer and new section filed 9-11-2003; operative 10-11-2003 (Register 2003, No. 37).