N.J. Admin. Code § 7:10-9.4
Current through Register Vol. 56, No. 12, June 17, 2024
Section 7:10-9.4 - Monitoring requirements and criteria for determination for ground water sources under the direct influence of surface water(a) Each supplier of water that has a ground water source that meets any of the criteria in 7:10-9.3(a) shall monitor that source for a period of one year from the date of receipt of notice of such determination made pursuant to 7:10-9.3 using the procedures set forth in (b) below.(b) During the one-year monitoring period established pursuant to (a) above, the supplier of water shall monitor the ground water source according to the sampling scheme below:1. The supplier of water shall collect precipitation data and sample the raw water source in four series of six weekly tests, with the series separated by at least 30 calendar days and one of the series performed during the period of peak production for the source, for all of the following physical/chemical parameters: v. Total coliform bacteria (if a sample result is positive for total coliform, the water shall be tested for fecal coliform or E. coli).2. The supplier of water shall sample the raw water source for particulate matter using Microscopic Particulates Analysis (MPA) as set forth in the U.S. Environmental Protection Agency's "Guidance Manual for Compliance with the Filtration and Disinfection Requirements For Public Water Systems Using Surface Water Sources" (dated March, 1991). A minimum of four particulate analyses shall be performed during the one-year monitoring period. The sampling shall be conducted immediately following significant precipitation events and/or during the period of peak production for the source and shall be separated by at least 60 calendar days. The analyses shall determine the presence, if any, of the following:iv. Insect parts and larvae;(c) If the sampling results for the physical/chemical parameters listed in (c)1 through 5 below show significant variation during the course of the one-year monitoring period established pursuant to (a) above, the supplier of water shall switch to particulate matter monitoring as described in (b)2 above for the remainder of the one-year monitoring period. If the supplier of water does not switch to particulate matter monitoring, then the raw water source will be considered by the Department to be "under the direct influence of surface water" and subject to the filtration and disinfection requirements of this subchapter. The Department considers the following variations to be "significant" for purposes of this subsection:1. The turbidity of the raw water source fluctuates more than 0.5 NTU over the course of any one month;2. The turbidity of the raw water source exceeds 1.0 NTU at any time;3. The temperature of the raw water source fluctuates in excess of five degrees Fahrenheit over the course of any one month or in excess of 15 degrees Fahrenheit over the course of one year;4. The pH, conductivity, or temperature of the raw water source varies by more than 20 percent of the annual average during any one month; or5. Fecal coliform bacteria occur in the raw water source.(d) Except as provided at (c) above, only the presence of rotifers, diatoms, coccidia, insect parts and larvae, fecal coliform or E. coli bacteria, Cryptosporidium, and/or Giardia cysts in the raw water source will be considered by the Department as indicative of direct surface water influence.(e) Each well in a wellfield shall be individually monitored pursuant to this section, even if all the wells discharge into a common header, unless physical circumstances prevent such individual monitoring.(f) A sampling report, including the raw water monitoring results in tabular form and a written description of the monitoring results, shall be submitted to the Department by mail at the address at N.J.A.C. 7:10-2.6(b) within 30 calendar days after the completion of monitoring conducted pursuant to this section.N.J. Admin. Code § 7:10-9.4
Amended by 49 N.J.R. 3505(b), effective 11/6/2017